/**

  * MojoShader; generate shader programs from bytecode of compiled

  *  Direct3D shaders.

  *

  * Please see the file LICENSE.txt in the source's root directory.

  *

  *  This file written by Ryan C. Gordon.

  */

 #ifndef _INCL_MOJOSHADER_H_

 #define _INCL_MOJOSHADER_H_

 #ifdef __cplusplus

 extern "C" {

 #endif

 /* You can define this if you aren't generating mojoshader_version.h */

 #ifndef MOJOSHADER_NO_VERSION_INCLUDE

 #include "mojoshader_version.h"

 #endif

 #ifndef MOJOSHADER_VERSION

 #define MOJOSHADER_VERSION -1

 #endif

 #ifndef MOJOSHADER_CHANGESET

 #define MOJOSHADER_CHANGESET "???"

 #endif

 /*

  * For determining the version of MojoShader you are using:

  *    const int compiled_against = MOJOSHADER_VERSION;

  *    const int linked_against = MOJOSHADER_version();

  *

  * The version is a single integer that increments, not a major/minor value.

  */

 int MOJOSHADER_version(void);

 /*

  * For determining the revision control changeset of MojoShader you are using:

  *    const char *compiled_against = MOJOSHADER_CHANGESET;

  *    const char *linked_against = MOJOSHADER_changeset();

  *

  * The version is an arbitrary, null-terminated ASCII string. It is probably

  *  a hash that represents a revision control changeset, and can't be

  *  compared to any other string to determine chronology.

  *

  * Do not attempt to free this string; it's statically allocated.

  */

 const char *MOJOSHADER_changeset(void);

 /*

  * These allocators work just like the C runtime's malloc() and free()

  *  (in fact, they probably use malloc() and free() internally if you don't

  *  specify your own allocator, but don't rely on that behaviour).

  * (data) is the pointer you supplied when specifying these allocator

  *  callbacks, in case you need instance-specific data...it is passed through

  *  to your allocator unmolested, and can be NULL if you like.

  */

 typedef void *(*MOJOSHADER_malloc)(int bytes, void *data);

 typedef void (*MOJOSHADER_free)(void *ptr, void *data);

 /*

  * These are enum values, but they also can be used in bitmasks, so we can

  *  test if an opcode is acceptable: if (op->shader_types & ourtype) {} ...

  */

 typedef enum

 {

     MOJOSHADER_TYPE_UNKNOWN  = 0,

     MOJOSHADER_TYPE_PIXEL    = (1 << 0),

     MOJOSHADER_TYPE_VERTEX   = (1 << 1),

     MOJOSHADER_TYPE_GEOMETRY = (1 << 2),  /* (not supported yet.) */

     MOJOSHADER_TYPE_ANY = 0xFFFFFFFF   /* used for bitmasks */

 } MOJOSHADER_shaderType;

 /*

  * Data types for vertex attribute streams.

  */

 typedef enum

 {

     MOJOSHADER_ATTRIBUTE_UNKNOWN = -1,  /* housekeeping; not returned. */

     MOJOSHADER_ATTRIBUTE_BYTE,

     MOJOSHADER_ATTRIBUTE_UBYTE,

     MOJOSHADER_ATTRIBUTE_SHORT,

     MOJOSHADER_ATTRIBUTE_USHORT,

     MOJOSHADER_ATTRIBUTE_INT,

     MOJOSHADER_ATTRIBUTE_UINT,

     MOJOSHADER_ATTRIBUTE_FLOAT,

     MOJOSHADER_ATTRIBUTE_DOUBLE,

     MOJOSHADER_ATTRIBUTE_HALF_FLOAT,  /* MAYBE available in your OpenGL! */

 } MOJOSHADER_attributeType;

 /*

  * Data types for uniforms. See MOJOSHADER_uniform for more information.

  */

 typedef enum

 {

     MOJOSHADER_UNIFORM_UNKNOWN = -1, /* housekeeping value; never returned. */

     MOJOSHADER_UNIFORM_FLOAT,

     MOJOSHADER_UNIFORM_INT,

     MOJOSHADER_UNIFORM_BOOL,

 } MOJOSHADER_uniformType;

 /*

  * These are the uniforms to be set for a shader. "Uniforms" are what Direct3D

  *  calls "Constants" ... IDirect3DDevice::SetVertexShaderConstantF() would

  *  need this data, for example. These integers are register indexes. So if

  *  index==6 and type==MOJOSHADER_UNIFORM_FLOAT, that means we'd expect a

  *  4-float vector to be specified for what would be register "c6" in D3D

  *  assembly language, before drawing with the shader.

  * (array_count) means this is an array of uniforms...this happens in some

  *  profiles when we see a relative address ("c0[a0.x]", not the usual "c0").

  *  In those cases, the shader was built to set some range of constant

  *  registers as an array. You should set this array with (array_count)

  *  elements from the constant register file, starting at (index) instead of

  *  just a single uniform. To be extra difficult, you'll need to fill in the

  *  correct values from the MOJOSHADER_constant data into the appropriate

  *  parts of the array, overriding the constant register file. Fun!

  * (constant) says whether this is a constant array; these need to be loaded

  *  once at creation time, from the constant list and not ever updated from

  *  the constant register file. This is a workaround for limitations in some

  *  profiles.

  * (name) is a profile-specific variable name; it may be NULL if it isn't

  *  applicable to the requested profile.

  */

 typedef struct MOJOSHADER_uniform

 {

     MOJOSHADER_uniformType type;

     int index;

     int array_count;

     int constant;

     const char *name;

 } MOJOSHADER_uniform;

 /*

  * These are the constants defined in a shader. These are data values

  *  hardcoded in a shader (with the DEF, DEFI, DEFB instructions), which

  *  override your Uniforms. This data is largely for informational purposes,

  *  since they are compiled in and can't be changed, like Uniforms can be.

  * These integers are register indexes. So if index==6 and

  *  type==MOJOSHADER_UNIFORM_FLOAT, that means we'd expect a 4-float vector

  *  to be specified for what would be register "c6" in D3D assembly language,

  *  before drawing with the shader.

  * (value) is the value of the constant, unioned by type.

  */

 typedef struct MOJOSHADER_constant

 {

     MOJOSHADER_uniformType type;

     int index;

     union

     {

         float f[4];  /* if type==MOJOSHADER_UNIFORM_FLOAT */

         int i[4];    /* if type==MOJOSHADER_UNIFORM_INT */

         int b;       /* if type==MOJOSHADER_UNIFORM_BOOL */

     } value;

 } MOJOSHADER_constant;

 /*

  * Data types for samplers. See MOJOSHADER_sampler for more information.

  */

 typedef enum

 {

     MOJOSHADER_SAMPLER_UNKNOWN = -1, /* housekeeping value; never returned. */

     MOJOSHADER_SAMPLER_2D,

     MOJOSHADER_SAMPLER_CUBE,

     MOJOSHADER_SAMPLER_VOLUME,

 } MOJOSHADER_samplerType;

 /*

  * These are the samplers to be set for a shader. ...

  *  IDirect3DDevice::SetTexture() would need this data, for example.

  * These integers are the sampler "stage". So if index==6 and

  *  type==MOJOSHADER_SAMPLER_2D, that means we'd expect a regular 2D texture

  *  to be specified for what would be register "s6" in D3D assembly language,

  *  before drawing with the shader.

  * (name) is a profile-specific variable name; it may be NULL if it isn't

  *  applicable to the requested profile.

  * (texbem) will be non-zero if a TEXBEM opcode references this sampler. This

  *  is only used in legacy shaders (ps_1_1 through ps_1_3), but it needs some

  *  special support to work, as we have to load a magic uniform behind the

  *  scenes to support it. Most code can ignore this field in general, and no

  *  one has to touch it unless they really know what they're doing.

  */

 typedef struct MOJOSHADER_sampler

 {

     MOJOSHADER_samplerType type;

     int index;

     const char *name;

     int texbem;

 } MOJOSHADER_sampler;

 /*

  * Data types for attributes. See MOJOSHADER_attribute for more information.

  */

 typedef enum

 {

     MOJOSHADER_USAGE_UNKNOWN = -1,  /* housekeeping value; never returned. */

     MOJOSHADER_USAGE_POSITION,

     MOJOSHADER_USAGE_BLENDWEIGHT,

     MOJOSHADER_USAGE_BLENDINDICES,

     MOJOSHADER_USAGE_NORMAL,

     MOJOSHADER_USAGE_POINTSIZE,

     MOJOSHADER_USAGE_TEXCOORD,

     MOJOSHADER_USAGE_TANGENT,

     MOJOSHADER_USAGE_BINORMAL,

     MOJOSHADER_USAGE_TESSFACTOR,

     MOJOSHADER_USAGE_POSITIONT,

     MOJOSHADER_USAGE_COLOR,

     MOJOSHADER_USAGE_FOG,

     MOJOSHADER_USAGE_DEPTH,

     MOJOSHADER_USAGE_SAMPLE,

     MOJOSHADER_USAGE_TOTAL,  /* housekeeping value; never returned. */

 } MOJOSHADER_usage;

 /*

  * These are the attributes to be set for a shader. "Attributes" are what

  *  Direct3D calls "Vertex Declarations Usages" ...

  *  IDirect3DDevice::CreateVertexDeclaration() would need this data, for

  *  example. Each attribute is associated with an array of data that uses one

  *  element per-vertex. So if usage==MOJOSHADER_USAGE_COLOR and index==1, that

  *  means we'd expect a secondary color array to be bound to this shader

  *  before drawing.

  * (name) is a profile-specific variable name; it may be NULL if it isn't

  *  applicable to the requested profile.

  */

 typedef struct MOJOSHADER_attribute

 {

     MOJOSHADER_usage usage;

     int index;

     const char *name;

 } MOJOSHADER_attribute;

 /*

  * Use this if you want to specify newly-parsed code to swizzle incoming

  *  data. This can be useful if you know, at parse time, that a shader

  *  will be processing data on COLOR0 that should be RGBA, but you'll

  *  be passing it a vertex array full of ARGB instead.

  */

 typedef struct MOJOSHADER_swizzle

 {

     MOJOSHADER_usage usage;

     unsigned int index;

     unsigned char swizzles[4];  /* {0,1,2,3} == .xyzw, {2,2,2,2} == .zzzz */

 } MOJOSHADER_swizzle;

 /*

  * MOJOSHADER_symbol data.

  *

  * These are used to expose high-level information in shader bytecode.

  *  They associate HLSL variables with registers. This data is used for both

  *  debugging and optimization.

  */

 typedef enum

 {

     MOJOSHADER_SYMREGSET_BOOL,

     MOJOSHADER_SYMREGSET_INT4,

     MOJOSHADER_SYMREGSET_FLOAT4,

     MOJOSHADER_SYMREGSET_SAMPLER,

 } MOJOSHADER_symbolRegisterSet;

 typedef enum

 {

     MOJOSHADER_SYMCLASS_SCALAR,

     MOJOSHADER_SYMCLASS_VECTOR,

     MOJOSHADER_SYMCLASS_MATRIX_ROWS,

     MOJOSHADER_SYMCLASS_MATRIX_COLUMNS,

     MOJOSHADER_SYMCLASS_OBJECT,

     MOJOSHADER_SYMCLASS_STRUCT,

 } MOJOSHADER_symbolClass;

 typedef enum

 {

     MOJOSHADER_SYMTYPE_VOID,

     MOJOSHADER_SYMTYPE_BOOL,

     MOJOSHADER_SYMTYPE_INT,

     MOJOSHADER_SYMTYPE_FLOAT,

     MOJOSHADER_SYMTYPE_STRING,

     MOJOSHADER_SYMTYPE_TEXTURE,

     MOJOSHADER_SYMTYPE_TEXTURE1D,

     MOJOSHADER_SYMTYPE_TEXTURE2D,

     MOJOSHADER_SYMTYPE_TEXTURE3D,

     MOJOSHADER_SYMTYPE_TEXTURECUBE,

     MOJOSHADER_SYMTYPE_SAMPLER,

     MOJOSHADER_SYMTYPE_SAMPLER1D,

     MOJOSHADER_SYMTYPE_SAMPLER2D,

     MOJOSHADER_SYMTYPE_SAMPLER3D,

     MOJOSHADER_SYMTYPE_SAMPLERCUBE,

     MOJOSHADER_SYMTYPE_PIXELSHADER,

     MOJOSHADER_SYMTYPE_VERTEXSHADER,

     MOJOSHADER_SYMTYPE_PIXELFRAGMENT,

     MOJOSHADER_SYMTYPE_VERTEXFRAGMENT,

     MOJOSHADER_SYMTYPE_UNSUPPORTED,

 } MOJOSHADER_symbolType;

 typedef struct MOJOSHADER_symbolStructMember MOJOSHADER_symbolStructMember;

 typedef struct MOJOSHADER_symbolTypeInfo

 {

     MOJOSHADER_symbolClass parameter_class;

     MOJOSHADER_symbolType parameter_type;

     unsigned int rows;

     unsigned int columns;

     unsigned int elements;

     unsigned int member_count;

     MOJOSHADER_symbolStructMember *members;

 } MOJOSHADER_symbolTypeInfo;

 struct MOJOSHADER_symbolStructMember

 {

     const char *name;

     MOJOSHADER_symbolTypeInfo info;

 };

 typedef struct MOJOSHADER_symbol

 {

     const char *name;

     MOJOSHADER_symbolRegisterSet register_set;

     unsigned int register_index;

     unsigned int register_count;

     MOJOSHADER_symbolTypeInfo info;

 } MOJOSHADER_symbol;

 /*

  * These are used with MOJOSHADER_error as special case positions.

  */

 #define MOJOSHADER_POSITION_NONE (-3)

 #define MOJOSHADER_POSITION_BEFORE (-2)

 #define MOJOSHADER_POSITION_AFTER (-1)

 typedef struct MOJOSHADER_error

 {

     /*

      * Human-readable error, if there is one. Will be NULL if there was no

      *  error. The string will be UTF-8 encoded, and English only. Most of

      *  these shouldn't be shown to the end-user anyhow.

      */

     const char *error;

     /*

      * Filename where error happened. This can be NULL if the information

      *  isn't available.

      */

     const char *filename;

     /*

      * Position of error, if there is one. Will be MOJOSHADER_POSITION_NONE if

      *  there was no error, MOJOSHADER_POSITION_BEFORE if there was an error

      *  before processing started, and MOJOSHADER_POSITION_AFTER if there was

      *  an error during final processing. If >= 0, MOJOSHADER_parse() sets

      *  this to the byte offset (starting at zero) into the bytecode you

      *  supplied, and MOJOSHADER_assemble(), MOJOSHADER_parseAst(), and

      *  MOJOSHADER_compile() sets this to a a line number in the source code

      *  you supplied (starting at one).

      */

     int error_position;

 } MOJOSHADER_error;

 /* !!! FIXME: document me. */

 typedef enum MOJOSHADER_preshaderOpcode

 {

     MOJOSHADER_PRESHADEROP_NOP,

     MOJOSHADER_PRESHADEROP_MOV,

     MOJOSHADER_PRESHADEROP_NEG,

     MOJOSHADER_PRESHADEROP_RCP,

     MOJOSHADER_PRESHADEROP_FRC,

     MOJOSHADER_PRESHADEROP_EXP,

     MOJOSHADER_PRESHADEROP_LOG,

     MOJOSHADER_PRESHADEROP_RSQ,

     MOJOSHADER_PRESHADEROP_SIN,

     MOJOSHADER_PRESHADEROP_COS,

     MOJOSHADER_PRESHADEROP_ASIN,

     MOJOSHADER_PRESHADEROP_ACOS,

     MOJOSHADER_PRESHADEROP_ATAN,

     MOJOSHADER_PRESHADEROP_MIN,

     MOJOSHADER_PRESHADEROP_MAX,

     MOJOSHADER_PRESHADEROP_LT,

     MOJOSHADER_PRESHADEROP_GE,

     MOJOSHADER_PRESHADEROP_ADD,

     MOJOSHADER_PRESHADEROP_MUL,

     MOJOSHADER_PRESHADEROP_ATAN2,

     MOJOSHADER_PRESHADEROP_DIV,

     MOJOSHADER_PRESHADEROP_CMP,

     MOJOSHADER_PRESHADEROP_MOVC,

     MOJOSHADER_PRESHADEROP_DOT,

     MOJOSHADER_PRESHADEROP_NOISE,

     MOJOSHADER_PRESHADEROP_SCALAR_OPS,

     MOJOSHADER_PRESHADEROP_MIN_SCALAR = MOJOSHADER_PRESHADEROP_SCALAR_OPS,

     MOJOSHADER_PRESHADEROP_MAX_SCALAR,

     MOJOSHADER_PRESHADEROP_LT_SCALAR,

     MOJOSHADER_PRESHADEROP_GE_SCALAR,

     MOJOSHADER_PRESHADEROP_ADD_SCALAR,

     MOJOSHADER_PRESHADEROP_MUL_SCALAR,

     MOJOSHADER_PRESHADEROP_ATAN2_SCALAR,

     MOJOSHADER_PRESHADEROP_DIV_SCALAR,

     MOJOSHADER_PRESHADEROP_DOT_SCALAR,

     MOJOSHADER_PRESHADEROP_NOISE_SCALAR,

 } MOJOSHADER_preshaderOpcode;

 typedef enum MOJOSHADER_preshaderOperandType

 {

     MOJOSHADER_PRESHADEROPERAND_INPUT,

     MOJOSHADER_PRESHADEROPERAND_OUTPUT,

     MOJOSHADER_PRESHADEROPERAND_LITERAL,

     MOJOSHADER_PRESHADEROPERAND_TEMP,

 } MOJOSHADER_preshaderOperandType;

 typedef struct MOJOSHADER_preshaderOperand

 {

     MOJOSHADER_preshaderOperandType type;

     unsigned int index;

 } MOJOSHADER_preshaderOperand;

 typedef struct MOJOSHADER_preshaderInstruction

 {

     MOJOSHADER_preshaderOpcode opcode;

     unsigned int element_count;

     unsigned int operand_count;

     MOJOSHADER_preshaderOperand operands[3];

 } MOJOSHADER_preshaderInstruction;

 typedef struct MOJOSHADER_preshader

 {

     unsigned int literal_count;

     double *literals;

     unsigned int temp_count;  /* scalar, not vector! */

     unsigned int symbol_count;

     MOJOSHADER_symbol *symbols;

     unsigned int instruction_count;

     MOJOSHADER_preshaderInstruction *instructions;

 } MOJOSHADER_preshader;

 /*

  * Structure used to return data from parsing of a shader...

  */

 /* !!! FIXME: most of these ints should be unsigned. */

 typedef struct MOJOSHADER_parseData

 {

     /*

      * The number of elements pointed to by (errors).

      */

     int error_count;

     /*

      * (error_count) elements of data that specify errors that were generated

      *  by parsing this shader.

      * This can be NULL if there were no errors or if (error_count) is zero.

      */

     MOJOSHADER_error *errors;

     /*

      * The name of the profile used to parse the shader. Will be NULL on error.

      */

     const char *profile;

     /*

      * Bytes of output from parsing. Most profiles produce a string of source

      *  code, but profiles that do binary output may not be text at all.

      *  Will be NULL on error.

      */

     const char *output;

     /*

      * Byte count for output, not counting any null terminator. Most profiles

      *  produce an ASCII string of source code (which will be null-terminated

      *  even though that null char isn't included in output_len), but profiles

      *  that do binary output may not be text at all. Will be 0 on error.

      */

     int output_len;

     /*

      * Count of Direct3D instruction slots used. This is meaningless in terms

      *  of the actual output, as the profile will probably grow or reduce

      *  the count (or for high-level languages, not have that information at

      *  all). Also, as with Microsoft's own assembler, this value is just a

      *  rough estimate, as unpredicable real-world factors make the actual

      *  value vary at least a little from this count. Still, it can give you

      *  a rough idea of the size of your shader. Will be zero on error.

      */

     int instruction_count;

     /*

      * The type of shader we parsed. Will be MOJOSHADER_TYPE_UNKNOWN on error.

      */

     MOJOSHADER_shaderType shader_type;

     /*

      * The shader's major version. If this was a "vs_3_0", this would be 3.

      */

     int major_ver;

     /*

      * The shader's minor version. If this was a "ps_1_4", this would be 4.

      *  Two notes: for "vs_2_x", this is 1, and for "vs_3_sw", this is 255.

      */

     int minor_ver;

     /*

      * The number of elements pointed to by (uniforms).

      */

     int uniform_count;

     /*

      * (uniform_count) elements of data that specify Uniforms to be set for

      *  this shader. See discussion on MOJOSHADER_uniform for details.

      * This can be NULL on error or if (uniform_count) is zero.

      */

     MOJOSHADER_uniform *uniforms;

     /*

      * The number of elements pointed to by (constants).

      */

     int constant_count;

     /*

      * (constant_count) elements of data that specify constants used in

      *  this shader. See discussion on MOJOSHADER_constant for details.

      * This can be NULL on error or if (constant_count) is zero.

      *  This is largely informational: constants are hardcoded into a shader.

      *  The constants that you can set like parameters are in the "uniforms"

      *  list.

      */

     MOJOSHADER_constant *constants;

     /*

      * The number of elements pointed to by (samplers).

      */

     int sampler_count;

     /*

      * (sampler_count) elements of data that specify Samplers to be set for

      *  this shader. See discussion on MOJOSHADER_sampler for details.

      * This can be NULL on error or if (sampler_count) is zero.

      */

     MOJOSHADER_sampler *samplers;

     /* !!! FIXME: this should probably be "input" and not "attribute" */

     /*

      * The number of elements pointed to by (attributes).

      */

     int attribute_count;

     /* !!! FIXME: this should probably be "input" and not "attribute" */

     /*

      * (attribute_count) elements of data that specify Attributes to be set

      *  for this shader. See discussion on MOJOSHADER_attribute for details.

      * This can be NULL on error or if (attribute_count) is zero.

      */

     MOJOSHADER_attribute *attributes;

     /*

      * The number of elements pointed to by (outputs).

      */

     int output_count;

     /*

      * (output_count) elements of data that specify outputs this shader

      *  writes to. See discussion on MOJOSHADER_attribute for details.

      * This can be NULL on error or if (output_count) is zero.

      */

     MOJOSHADER_attribute *outputs;

     /*

      * The number of elements pointed to by (swizzles).

      */

     int swizzle_count;

     /* !!! FIXME: this should probably be "input" and not "attribute" */

     /*

      * (swizzle_count) elements of data that specify swizzles the shader will

      *  apply to incoming attributes. This is a copy of what was passed to

      *  MOJOSHADER_parseData().

      * This can be NULL on error or if (swizzle_count) is zero.

      */

     MOJOSHADER_swizzle *swizzles;

     /*

      * The number of elements pointed to by (symbols).

      */

     int symbol_count;

     /*

      * (symbol_count) elements of data that specify high-level symbol data

      *  for the shader. This will be parsed from the CTAB section

      *  in bytecode, and will be a copy of what you provide to

      *  MOJOSHADER_assemble(). This data is optional.

      * This can be NULL on error or if (symbol_count) is zero.

      */

     MOJOSHADER_symbol *symbols;

     /*

      * !!! FIXME: document me.

      * This can be NULL on error or if no preshader was available.

      */

     MOJOSHADER_preshader *preshader;

     /*

      * This is the malloc implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_malloc malloc;

     /*

      * This is the free implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_free free;

     /*

      * This is the pointer you passed as opaque data for your allocator.

      */

     void *malloc_data;

 } MOJOSHADER_parseData;

 /*

  * Profile string for Direct3D assembly language output.

  */

 #define MOJOSHADER_PROFILE_D3D "d3d"

 /*

  * Profile string for passthrough of the original bytecode, unchanged.

  */

 #define MOJOSHADER_PROFILE_BYTECODE "bytecode"

 /*

  * Profile string for GLSL: OpenGL high-level shader language output.

  */

 #define MOJOSHADER_PROFILE_GLSL "glsl"

 /*

  * Profile string for GLSL 1.20: minor improvements to base GLSL spec.

  */

 #define MOJOSHADER_PROFILE_GLSL120 "glsl120"

 /*

  * Profile string for OpenGL ARB 1.0 shaders: GL_ARB_(vertex|fragment)_program.

  */

 #define MOJOSHADER_PROFILE_ARB1 "arb1"

 /*

  * Profile string for OpenGL ARB 1.0 shaders with Nvidia 2.0 extensions:

  *  GL_NV_vertex_program2_option and GL_NV_fragment_program2

  */

 #define MOJOSHADER_PROFILE_NV2 "nv2"

 /*

  * Profile string for OpenGL ARB 1.0 shaders with Nvidia 3.0 extensions:

  *  GL_NV_vertex_program3 and GL_NV_fragment_program2

  */

 #define MOJOSHADER_PROFILE_NV3 "nv3"

 /*

  * Profile string for OpenGL ARB 1.0 shaders with Nvidia 4.0 extensions:

  *  GL_NV_gpu_program4

  */

 #define MOJOSHADER_PROFILE_NV4 "nv4"

 /*

  * Determine the highest supported Shader Model for a profile.

  */

 int MOJOSHADER_maxShaderModel(const char *profile);

 /*

  * Parse a compiled Direct3D shader's bytecode.

  *

  * This is your primary entry point into MojoShader. You need to pass it

  *  a compiled D3D shader and tell it which "profile" you want to use to

  *  convert it into useful data.

  *

  * The available profiles are the set of MOJOSHADER_PROFILE_* defines.

  *  Note that MojoShader may be built without support for all listed

  *  profiles (in which case using one here will return with an error).

  *

  * As parsing requires some memory to be allocated, you may provide a custom

  *  allocator to this function, which will be used to allocate/free memory.

  *  They function just like malloc() and free(). We do not use realloc().

  *  If you don't care, pass NULL in for the allocator functions. If your

  *  allocator needs instance-specific data, you may supply it with the

  *  (d) parameter. This pointer is passed as-is to your (m) and (f) functions.

  *

  * This function returns a MOJOSHADER_parseData.

  *

  * This function will never return NULL, even if the system is completely

  *  out of memory upon entry (in which case, this function returns a static

  *  MOJOSHADER_parseData object, which is still safe to pass to

  *  MOJOSHADER_freeParseData()).

  *

  * You can tell the generated program to swizzle certain inputs. If you know

  *  that COLOR0 should be RGBA but you're passing in ARGB, you can specify

  *  a swizzle of { MOJOSHADER_USAGE_COLOR, 0, {1,2,3,0} } to (swiz). If the

  *  input register in the code would produce reg.ywzx, that swizzle would

  *  change it to reg.wzxy ... (swiz) can be NULL.

  *

  * This function is thread safe, so long as (m) and (f) are too, and that

  *  (tokenbuf) remains intact for the duration of the call. This allows you

  *  to parse several shaders on separate CPU cores at the same time.

  */

 const MOJOSHADER_parseData *MOJOSHADER_parse(const char *profile,

                                              const unsigned char *tokenbuf,

                                              const unsigned int bufsize,

                                              const MOJOSHADER_swizzle *swiz,

                                              const unsigned int swizcount,

                                              MOJOSHADER_malloc m,

                                              MOJOSHADER_free f,

                                              void *d);

 /*

  * Call this to dispose of parsing results when you are done with them.

  *  This will call the MOJOSHADER_free function you provided to

  *  MOJOSHADER_parse multiple times, if you provided one.

  *  Passing a NULL here is a safe no-op.

  *

  * This function is thread safe, so long as any allocator you passed into

  *  MOJOSHADER_parse() is, too.

  */

 void MOJOSHADER_freeParseData(const MOJOSHADER_parseData *data);

 /* Effects interface... */  /* !!! FIXME: THIS API IS NOT STABLE YET! */

 typedef struct MOJOSHADER_effectParam

 {

     const char *name;

     const char *semantic;

 } MOJOSHADER_effectParam;

 typedef struct MOJOSHADER_effectState

 {

     unsigned int type;

 } MOJOSHADER_effectState;

 typedef struct MOJOSHADER_effectPass

 {

     const char *name;

     unsigned int state_count;

     MOJOSHADER_effectState *states;

 } MOJOSHADER_effectPass;

 typedef struct MOJOSHADER_effectTechnique

 {

     const char *name;

     unsigned int pass_count;

     MOJOSHADER_effectPass *passes;

 } MOJOSHADER_effectTechnique;

 typedef struct MOJOSHADER_effectTexture

 {

     unsigned int param;

     const char *name;

 } MOJOSHADER_effectTexture;

 typedef struct MOJOSHADER_effectShader

 {

     unsigned int technique;

     unsigned int pass;

     const MOJOSHADER_parseData *shader;

 } MOJOSHADER_effectShader;

 /*

  * Structure used to return data from parsing of an effect file...

  */

 /* !!! FIXME: most of these ints should be unsigned. */

 typedef struct MOJOSHADER_effect

 {

     /*

      * The number of elements pointed to by (errors).

      */

     int error_count;

     /*

      * (error_count) elements of data that specify errors that were generated

      *  by parsing this shader.

      * This can be NULL if there were no errors or if (error_count) is zero.

      */

     MOJOSHADER_error *errors;

     /*

      * The name of the profile used to parse the shader. Will be NULL on error.

      */

     const char *profile;

     /*

      * The number of params pointed to by (params).

      */

     int param_count;

     /*

      * (param_count) elements of data that specify parameter bind points for

      *  this effect.

      * This can be NULL on error or if (param_count) is zero.

      */

     MOJOSHADER_effectParam *params;

     /*

      * The number of elements pointed to by (techniques).

      */

     int technique_count;

     /*

      * (technique_count) elements of data that specify techniques used in

      *  this effect. Each technique contains a series of passes, and each pass

      *  specifies state and shaders that affect rendering.

      * This can be NULL on error or if (technique_count) is zero.

      */

     MOJOSHADER_effectTechnique *techniques;

     /*

      * The number of elements pointed to by (textures).

      */

     int texture_count;

     /*

      * (texture_count) elements of data that specify textures used in

      *  this effect.

      * This can be NULL on error or if (texture_count) is zero.

      */

     MOJOSHADER_effectTexture *textures;

     /*

      * The number of elements pointed to by (shaders).

      */

     int shader_count;

     /*

      * (shader_count) elements of data that specify shaders used in

      *  this effect.

      * This can be NULL on error or if (shader_count) is zero.

      */

     MOJOSHADER_effectShader *shaders;

     /*

      * This is the malloc implementation you passed to MOJOSHADER_parseEffect().

      */

     MOJOSHADER_malloc malloc;

     /*

      * This is the free implementation you passed to MOJOSHADER_parseEffect().

      */

     MOJOSHADER_free free;

     /*

      * This is the pointer you passed as opaque data for your allocator.

      */

     void *malloc_data;

 } MOJOSHADER_effect;

 /* !!! FIXME: document me. */

 const MOJOSHADER_effect *MOJOSHADER_parseEffect(const char *profile,

                                                 const unsigned char *buf,

                                                 const unsigned int _len,

                                                 const MOJOSHADER_swizzle *swiz,

                                                 const unsigned int swizcount,

                                                 MOJOSHADER_malloc m,

                                                 MOJOSHADER_free f,

                                                 void *d);

 /* !!! FIXME: document me. */

 void MOJOSHADER_freeEffect(const MOJOSHADER_effect *effect);

 /* Preprocessor interface... */

 /*

  * Structure used to pass predefined macros. Maps to D3DXMACRO.

  *  You can have macro arguments: set identifier to "a(b, c)" or whatever.

  */

 typedef struct MOJOSHADER_preprocessorDefine

 {

     const char *identifier;

     const char *definition;

 } MOJOSHADER_preprocessorDefine;

 /*

  * Used with the MOJOSHADER_includeOpen callback. Maps to D3DXINCLUDE_TYPE.

  */

 typedef enum

 {

     MOJOSHADER_INCLUDETYPE_LOCAL,   /* local header: #include "blah.h" */

     MOJOSHADER_INCLUDETYPE_SYSTEM   /* system header: #include <blah.h> */

 } MOJOSHADER_includeType;

 /*

  * Structure used to return data from preprocessing of a shader...

  */

 /* !!! FIXME: most of these ints should be unsigned. */

 typedef struct MOJOSHADER_preprocessData

 {

     /*

      * The number of elements pointed to by (errors).

      */

     int error_count;

     /*

      * (error_count) elements of data that specify errors that were generated

      *  by parsing this shader.

      * This can be NULL if there were no errors or if (error_count) is zero.

      */

     MOJOSHADER_error *errors;

     /*

      * Bytes of output from preprocessing. This is a UTF-8 string. We

      *  guarantee it to be NULL-terminated. Will be NULL on error.

      */

     const char *output;

     /*

      * Byte count for output, not counting any null terminator.

      *  Will be 0 on error.

      */

     int output_len;

     /*

      * This is the malloc implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_malloc malloc;

     /*

      * This is the free implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_free free;

     /*

      * This is the pointer you passed as opaque data for your allocator.

      */

     void *malloc_data;

 } MOJOSHADER_preprocessData;

 /*

  * This callback allows an app to handle #include statements for the

  *  preprocessor. When the preprocessor sees an #include, it will call this

  *  function to obtain the contents of the requested file. This is optional;

  *  the preprocessor will open files directly if no callback is supplied, but

  *  this allows an app to retrieve data from something other than the

  *  traditional filesystem (for example, headers packed in a .zip file or

  *  headers generated on-the-fly).

  *

  * This function maps to ID3DXInclude::Open()

  *

  * (inctype) specifies the type of header we wish to include.

  * (fname) specifies the name of the file specified on the #include line.

  * (parent) is a string of the entire source file containing the include, in

  *  its original, not-yet-preprocessed state. Note that this is just the

  *  contents of the specific file, not all source code that the preprocessor

  *  has seen through other includes, etc.

  * (outdata) will be set by the callback to a pointer to the included file's

  *  contents. The callback is responsible for allocating this however they

  *  see fit (we provide allocator functions, but you may ignore them). This

  *  pointer must remain valid until the includeClose callback runs. This

  *  string does not need to be NULL-terminated.

  * (outbytes) will be set by the callback to the number of bytes pointed to

  *  by (outdata).

  * (m),(f), and (d) are the allocator details that the application passed to

  *  MojoShader. If these were NULL, MojoShader may have replaced them with its

  *  own internal allocators.

  *

  * The callback returns zero on error, non-zero on success.

  *

  * If you supply an includeOpen callback, you must supply includeClose, too.

  */

 typedef int (*MOJOSHADER_includeOpen)(MOJOSHADER_includeType inctype,

                             const char *fname, const char *parent,

                             const char **outdata, unsigned int *outbytes,

                             MOJOSHADER_malloc m, MOJOSHADER_free f, void *d);

 /*

  * This callback allows an app to clean up the results of a previous

  *  includeOpen callback.

  *

  * This function maps to ID3DXInclude::Close()

  *

  * (data) is the data that was returned from a previous call to includeOpen.

  *  It is now safe to deallocate this data.

  * (m),(f), and (d) are the same allocator details that were passed to your

  *  includeOpen callback.

  *

  * If you supply an includeClose callback, you must supply includeOpen, too.

  */

 typedef void (*MOJOSHADER_includeClose)(const char *data,

                             MOJOSHADER_malloc m, MOJOSHADER_free f, void *d);

 /*

  * This function is optional. Even if you are dealing with shader source

  *  code, you don't need to explicitly use the preprocessor, as the compiler

  *  and assembler will use it behind the scenes. In fact, you probably never

  *  need this function unless you are debugging a custom tool (or debugging

  *  MojoShader itself).

  *

  * Preprocessing roughly follows the syntax of an ANSI C preprocessor, as

  *  Microsoft's Direct3D assembler and HLSL compiler use this syntax. Please

  *  note that we try to match the output you'd get from Direct3D's

  *  preprocessor, which has some quirks if you're expecting output that matches

  *  a generic C preprocessor.

  *

  * This function maps to D3DXPreprocessShader().

  *

  * (filename) is a NULL-terminated UTF-8 filename. It can be NULL. We do not

  *  actually access this file, as we obtain our data from (source). This

  *  string is copied when we need to report errors while processing (source),

  *  as opposed to errors in a file referenced via the #include directive in

  *  (source). If this is NULL, then errors will report the filename as NULL,

  *  too.

  *

  * (source) is an string of UTF-8 text to preprocess. It does not need to be

  *  NULL-terminated.

  *

  * (sourcelen) is the length of the string pointed to by (source), in bytes.

  *

  * (defines) points to (define_count) preprocessor definitions, and can be

  *  NULL. These are treated by the preprocessor as if the source code started

  *  with one #define for each entry you pass in here.

  *

  * (include_open) and (include_close) let the app control the preprocessor's

  *  behaviour for #include statements. Both are optional and can be NULL, but

  *  both must be specified if either is specified.

  *

  * This will return a MOJOSHADER_preprocessorData. You should pass this

  *  return value to MOJOSHADER_freePreprocessData() when you are done with

  *  it.

  *

  * This function will never return NULL, even if the system is completely

  *  out of memory upon entry (in which case, this function returns a static

  *  MOJOSHADER_preprocessData object, which is still safe to pass to

  *  MOJOSHADER_freePreprocessData()).

  *

  * As preprocessing requires some memory to be allocated, you may provide a

  *  custom allocator to this function, which will be used to allocate/free

  *  memory. They function just like malloc() and free(). We do not use

  *  realloc(). If you don't care, pass NULL in for the allocator functions.

  *  If your allocator needs instance-specific data, you may supply it with the

  *  (d) parameter. This pointer is passed as-is to your (m) and (f) functions.

  *

  * This function is thread safe, so long as the various callback functions

  *  are, too, and that the parameters remains intact for the duration of the

  *  call. This allows you to preprocess several shaders on separate CPU cores

  *  at the same time.

  */

 const MOJOSHADER_preprocessData *MOJOSHADER_preprocess(const char *filename,

                              const char *source, unsigned int sourcelen,

                              const MOJOSHADER_preprocessorDefine *defines,

                              unsigned int define_count,

                              MOJOSHADER_includeOpen include_open,

                              MOJOSHADER_includeClose include_close,

                              MOJOSHADER_malloc m, MOJOSHADER_free f, void *d);

 /*

  * Call this to dispose of preprocessing results when you are done with them.

  *  This will call the MOJOSHADER_free function you provided to

  *  MOJOSHADER_preprocess() multiple times, if you provided one.

  *  Passing a NULL here is a safe no-op.

  *

  * This function is thread safe, so long as any allocator you passed into

  *  MOJOSHADER_preprocess() is, too.

  */

 void MOJOSHADER_freePreprocessData(const MOJOSHADER_preprocessData *data);

 /* Assembler interface... */

 /*

  * This function is optional. Use this to convert Direct3D shader assembly

  *  language into bytecode, which can be handled by MOJOSHADER_parse().

  *

  * (filename) is a NULL-terminated UTF-8 filename. It can be NULL. We do not

  *  actually access this file, as we obtain our data from (source). This

  *  string is copied when we need to report errors while processing (source),

  *  as opposed to errors in a file referenced via the #include directive in

  *  (source). If this is NULL, then errors will report the filename as NULL,

  *  too.

  *

  * (source) is an UTF-8 string of valid Direct3D shader assembly source code.

  *  It does not need to be NULL-terminated.

  *

  * (sourcelen) is the length of the string pointed to by (source), in bytes.

  *

  * (comments) points to (comment_count) NULL-terminated UTF-8 strings, and

  *  can be NULL. These strings are inserted as comments in the bytecode.

  *

  * (symbols) points to (symbol_count) symbol structs, and can be NULL. These

  *  become a CTAB field in the bytecode. This is optional, but

  *  MOJOSHADER_parse() needs CTAB data for all arrays used in a program, or

  *  relative addressing will not be permitted, so you'll want to at least

  *  provide symbol information for those. The symbol data is 100% trusted

  *  at this time; it will not be checked to see if it matches what was

  *  assembled in any way whatsoever.

  *

  * (defines) points to (define_count) preprocessor definitions, and can be

  *  NULL. These are treated by the preprocessor as if the source code started

  *  with one #define for each entry you pass in here.

  *

  * (include_open) and (include_close) let the app control the preprocessor's

  *  behaviour for #include statements. Both are optional and can be NULL, but

  *  both must be specified if either is specified.

  *

  * This will return a MOJOSHADER_parseData, like MOJOSHADER_parse() would,

  *  except the profile will be MOJOSHADER_PROFILE_BYTECODE and the output

  *  will be the assembled bytecode instead of some other language. This output

  *  can be pushed back through MOJOSHADER_parseData() with a different profile.

  *

  * This function will never return NULL, even if the system is completely

  *  out of memory upon entry (in which case, this function returns a static

  *  MOJOSHADER_parseData object, which is still safe to pass to

  *  MOJOSHADER_freeParseData()).

  *

  * As assembling requires some memory to be allocated, you may provide a

  *  custom allocator to this function, which will be used to allocate/free

  *  memory. They function just like malloc() and free(). We do not use

  *  realloc(). If you don't care, pass NULL in for the allocator functions.

  *  If your allocator needs instance-specific data, you may supply it with the

  *  (d) parameter. This pointer is passed as-is to your (m) and (f) functions.

  *

  * This function is thread safe, so long as the various callback functions

  *  are, too, and that the parameters remains intact for the duration of the

  *  call. This allows you to assemble several shaders on separate CPU cores

  *  at the same time.

  */

 const MOJOSHADER_parseData *MOJOSHADER_assemble(const char *filename,

                              const char *source, unsigned int sourcelen,

                              const char **comments, unsigned int comment_count,

                              const MOJOSHADER_symbol *symbols,

                              unsigned int symbol_count,

                              const MOJOSHADER_preprocessorDefine *defines,

                              unsigned int define_count,

                              MOJOSHADER_includeOpen include_open,

                              MOJOSHADER_includeClose include_close,

                              MOJOSHADER_malloc m, MOJOSHADER_free f, void *d);

 /* High level shading language support... */

 /*

  * Source profile strings for HLSL: Direct3D High Level Shading Language.

  */

 #define MOJOSHADER_SRC_PROFILE_HLSL_VS_1_1 "hlsl_vs_1_1"

 #define MOJOSHADER_SRC_PROFILE_HLSL_VS_2_0 "hlsl_vs_2_0"

 #define MOJOSHADER_SRC_PROFILE_HLSL_VS_3_0 "hlsl_vs_3_0"

 #define MOJOSHADER_SRC_PROFILE_HLSL_PS_1_1 "hlsl_ps_1_1"

 #define MOJOSHADER_SRC_PROFILE_HLSL_PS_1_2 "hlsl_ps_1_2"

 #define MOJOSHADER_SRC_PROFILE_HLSL_PS_1_3 "hlsl_ps_1_3"

 #define MOJOSHADER_SRC_PROFILE_HLSL_PS_1_4 "hlsl_ps_1_4"

 #define MOJOSHADER_SRC_PROFILE_HLSL_PS_2_0 "hlsl_ps_2_0"

 #define MOJOSHADER_SRC_PROFILE_HLSL_PS_3_0 "hlsl_ps_3_0"

 /* Abstract Syntax Tree interface... */

 /*

  * ATTENTION: This adds a lot of stuff to the API, but almost everyone can

  *  ignore this section. Seriously, go ahead and skip over anything that has

  *  "AST" in it, unless you know why you'd want to use it.

  *

  * ALSO: This API is still evolving! We make no promises at this time to keep

  *  source or binary compatibility for the AST pieces.

  *

  * Important notes:

  *  - ASTs are the result of parsing the source code: a program that fails to

  *    compile will often parse successfully. Undeclared variables,

  *    type incompatibilities, etc, aren't detected at this point.

  *  - Vector swizzles (the ".xyzw" part of "MyVec4.xyzw") will look like

  *    structure dereferences. We don't realize these are actually swizzles

  *    until semantic analysis.

  *  - MOJOSHADER_astDataType info is not reliable when returned from

  *    MOJOSHADER_parseAst()! Most of the datatype info will be missing or have

  *    inaccurate data types. We sort these out during semantic analysis, which

  *    happens after the AST parsing is complete. A few are filled in, or can

  *    be deduced fairly trivially by processing several pieces into one.

  *    It's enough that you can reproduce the original source code, more or

  *    less, from the AST.

  */

 /* High-level datatypes for AST nodes. */

 typedef enum MOJOSHADER_astDataTypeType

 {

     MOJOSHADER_AST_DATATYPE_NONE,

     MOJOSHADER_AST_DATATYPE_BOOL,

     MOJOSHADER_AST_DATATYPE_INT,

     MOJOSHADER_AST_DATATYPE_UINT,

     MOJOSHADER_AST_DATATYPE_FLOAT,

     MOJOSHADER_AST_DATATYPE_FLOAT_SNORM,

     MOJOSHADER_AST_DATATYPE_FLOAT_UNORM,

     MOJOSHADER_AST_DATATYPE_HALF,

     MOJOSHADER_AST_DATATYPE_DOUBLE,

     MOJOSHADER_AST_DATATYPE_STRING,

     MOJOSHADER_AST_DATATYPE_SAMPLER_1D,

     MOJOSHADER_AST_DATATYPE_SAMPLER_2D,

     MOJOSHADER_AST_DATATYPE_SAMPLER_3D,

     MOJOSHADER_AST_DATATYPE_SAMPLER_CUBE,

     MOJOSHADER_AST_DATATYPE_SAMPLER_STATE,

     MOJOSHADER_AST_DATATYPE_SAMPLER_COMPARISON_STATE,

     MOJOSHADER_AST_DATATYPE_STRUCT,

     MOJOSHADER_AST_DATATYPE_ARRAY,

     MOJOSHADER_AST_DATATYPE_VECTOR,

     MOJOSHADER_AST_DATATYPE_MATRIX,

     MOJOSHADER_AST_DATATYPE_BUFFER,

     MOJOSHADER_AST_DATATYPE_FUNCTION,

     MOJOSHADER_AST_DATATYPE_USER,

 } MOJOSHADER_astDataTypeType;

 #define MOJOSHADER_AST_DATATYPE_CONST (1 << 31)

 typedef union MOJOSHADER_astDataType MOJOSHADER_astDataType;

 // This is just part of DataTypeStruct, never appears outside of it.

 typedef struct MOJOSHADER_astDataTypeStructMember

 {

     const MOJOSHADER_astDataType *datatype;

     const char *identifier;

 } MOJOSHADER_astDataTypeStructMember;

 typedef struct MOJOSHADER_astDataTypeStruct

 {

     MOJOSHADER_astDataTypeType type;

     const MOJOSHADER_astDataTypeStructMember *members;

     int member_count;

 } MOJOSHADER_astDataTypeStruct;

 typedef struct MOJOSHADER_astDataTypeArray

 {

     MOJOSHADER_astDataTypeType type;

     const MOJOSHADER_astDataType *base;

     int elements;

 } MOJOSHADER_astDataTypeArray;

 typedef MOJOSHADER_astDataTypeArray MOJOSHADER_astDataTypeVector;

 typedef struct MOJOSHADER_astDataTypeMatrix

 {

     MOJOSHADER_astDataTypeType type;

     const MOJOSHADER_astDataType *base;

     int rows;

     int columns;

 } MOJOSHADER_astDataTypeMatrix;

 typedef struct MOJOSHADER_astDataTypeBuffer

 {

     MOJOSHADER_astDataTypeType type;

     const MOJOSHADER_astDataType *base;

 } MOJOSHADER_astDataTypeBuffer;

 typedef struct MOJOSHADER_astDataTypeFunction

 {

     MOJOSHADER_astDataTypeType type;

     const MOJOSHADER_astDataType *retval;

     const MOJOSHADER_astDataType **params;

     int num_params;

     int intrinsic;  /* non-zero for built-in functions */

 } MOJOSHADER_astDataTypeFunction;

 typedef struct MOJOSHADER_astDataTypeUser

 {

     MOJOSHADER_astDataTypeType type;

     const MOJOSHADER_astDataType *details;

     const char *name;

 } MOJOSHADER_astDataTypeUser;

 union MOJOSHADER_astDataType

 {

     MOJOSHADER_astDataTypeType type;

     MOJOSHADER_astDataTypeArray array;

     MOJOSHADER_astDataTypeStruct structure;

     MOJOSHADER_astDataTypeVector vector;

     MOJOSHADER_astDataTypeMatrix matrix;

     MOJOSHADER_astDataTypeBuffer buffer;

     MOJOSHADER_astDataTypeUser user;

     MOJOSHADER_astDataTypeFunction function;

 };

 /* Structures that make up the parse tree... */

 typedef enum MOJOSHADER_astNodeType

 {

     MOJOSHADER_AST_OP_START_RANGE,         /* expression operators. */

     MOJOSHADER_AST_OP_START_RANGE_UNARY,   /* unary operators. */

     MOJOSHADER_AST_OP_PREINCREMENT,

     MOJOSHADER_AST_OP_PREDECREMENT,

     MOJOSHADER_AST_OP_NEGATE,

     MOJOSHADER_AST_OP_COMPLEMENT,

     MOJOSHADER_AST_OP_NOT,

     MOJOSHADER_AST_OP_POSTINCREMENT,

     MOJOSHADER_AST_OP_POSTDECREMENT,

     MOJOSHADER_AST_OP_CAST,

     MOJOSHADER_AST_OP_END_RANGE_UNARY,

     MOJOSHADER_AST_OP_START_RANGE_BINARY,  /* binary operators. */

     MOJOSHADER_AST_OP_COMMA,

     MOJOSHADER_AST_OP_MULTIPLY,

     MOJOSHADER_AST_OP_DIVIDE,

     MOJOSHADER_AST_OP_MODULO,

     MOJOSHADER_AST_OP_ADD,

     MOJOSHADER_AST_OP_SUBTRACT,

     MOJOSHADER_AST_OP_LSHIFT,

     MOJOSHADER_AST_OP_RSHIFT,

     MOJOSHADER_AST_OP_LESSTHAN,

     MOJOSHADER_AST_OP_GREATERTHAN,

     MOJOSHADER_AST_OP_LESSTHANOREQUAL,

     MOJOSHADER_AST_OP_GREATERTHANOREQUAL,

     MOJOSHADER_AST_OP_EQUAL,

     MOJOSHADER_AST_OP_NOTEQUAL,

     MOJOSHADER_AST_OP_BINARYAND,

     MOJOSHADER_AST_OP_BINARYXOR,

     MOJOSHADER_AST_OP_BINARYOR,

     MOJOSHADER_AST_OP_LOGICALAND,

     MOJOSHADER_AST_OP_LOGICALOR,

     MOJOSHADER_AST_OP_ASSIGN,

     MOJOSHADER_AST_OP_MULASSIGN,

     MOJOSHADER_AST_OP_DIVASSIGN,

     MOJOSHADER_AST_OP_MODASSIGN,

     MOJOSHADER_AST_OP_ADDASSIGN,

     MOJOSHADER_AST_OP_SUBASSIGN,

     MOJOSHADER_AST_OP_LSHIFTASSIGN,

     MOJOSHADER_AST_OP_RSHIFTASSIGN,

     MOJOSHADER_AST_OP_ANDASSIGN,

     MOJOSHADER_AST_OP_XORASSIGN,

     MOJOSHADER_AST_OP_ORASSIGN,

     MOJOSHADER_AST_OP_DEREF_ARRAY,

     MOJOSHADER_AST_OP_END_RANGE_BINARY,

     MOJOSHADER_AST_OP_START_RANGE_TERNARY,  /* ternary operators. */

     MOJOSHADER_AST_OP_CONDITIONAL,

     MOJOSHADER_AST_OP_END_RANGE_TERNARY,

     MOJOSHADER_AST_OP_START_RANGE_DATA,     /* expression operands. */

     MOJOSHADER_AST_OP_IDENTIFIER,

     MOJOSHADER_AST_OP_INT_LITERAL,

     MOJOSHADER_AST_OP_FLOAT_LITERAL,

     MOJOSHADER_AST_OP_STRING_LITERAL,

     MOJOSHADER_AST_OP_BOOLEAN_LITERAL,

     MOJOSHADER_AST_OP_END_RANGE_DATA,

     MOJOSHADER_AST_OP_START_RANGE_MISC,     /* other expression things. */

     MOJOSHADER_AST_OP_DEREF_STRUCT,

     MOJOSHADER_AST_OP_CALLFUNC,

     MOJOSHADER_AST_OP_CONSTRUCTOR,

     MOJOSHADER_AST_OP_END_RANGE_MISC,

     MOJOSHADER_AST_OP_END_RANGE,

     MOJOSHADER_AST_COMPUNIT_START_RANGE,    /* things in global scope. */

     MOJOSHADER_AST_COMPUNIT_FUNCTION,

     MOJOSHADER_AST_COMPUNIT_TYPEDEF,

     MOJOSHADER_AST_COMPUNIT_STRUCT,

     MOJOSHADER_AST_COMPUNIT_VARIABLE,

     MOJOSHADER_AST_COMPUNIT_END_RANGE,

     MOJOSHADER_AST_STATEMENT_START_RANGE,   /* statements in function scope. */

     MOJOSHADER_AST_STATEMENT_EMPTY,

     MOJOSHADER_AST_STATEMENT_BREAK,

     MOJOSHADER_AST_STATEMENT_CONTINUE,

     MOJOSHADER_AST_STATEMENT_DISCARD,

     MOJOSHADER_AST_STATEMENT_BLOCK,

     MOJOSHADER_AST_STATEMENT_EXPRESSION,

     MOJOSHADER_AST_STATEMENT_IF,

     MOJOSHADER_AST_STATEMENT_SWITCH,

     MOJOSHADER_AST_STATEMENT_FOR,

     MOJOSHADER_AST_STATEMENT_DO,

     MOJOSHADER_AST_STATEMENT_WHILE,

     MOJOSHADER_AST_STATEMENT_RETURN,

     MOJOSHADER_AST_STATEMENT_TYPEDEF,

     MOJOSHADER_AST_STATEMENT_STRUCT,

     MOJOSHADER_AST_STATEMENT_VARDECL,

     MOJOSHADER_AST_STATEMENT_END_RANGE,

     MOJOSHADER_AST_MISC_START_RANGE,        /* misc. syntactic glue. */

     MOJOSHADER_AST_FUNCTION_PARAMS,

     MOJOSHADER_AST_FUNCTION_SIGNATURE,

     MOJOSHADER_AST_SCALAR_OR_ARRAY,

     MOJOSHADER_AST_TYPEDEF,

     MOJOSHADER_AST_PACK_OFFSET,

     MOJOSHADER_AST_VARIABLE_LOWLEVEL,

     MOJOSHADER_AST_ANNOTATION,

     MOJOSHADER_AST_VARIABLE_DECLARATION,

     MOJOSHADER_AST_STRUCT_DECLARATION,

     MOJOSHADER_AST_STRUCT_MEMBER,

     MOJOSHADER_AST_SWITCH_CASE,

     MOJOSHADER_AST_ARGUMENTS,

     MOJOSHADER_AST_MISC_END_RANGE,

     MOJOSHADER_AST_END_RANGE

 } MOJOSHADER_astNodeType;

 typedef struct MOJOSHADER_astNodeInfo

 {

     MOJOSHADER_astNodeType type;

     const char *filename;

     unsigned int line;

 } MOJOSHADER_astNodeInfo;

 typedef enum MOJOSHADER_astVariableAttributes

 {

     MOJOSHADER_AST_VARATTR_EXTERN = (1 << 0),

     MOJOSHADER_AST_VARATTR_NOINTERPOLATION = (1 << 1),

     MOJOSHADER_AST_VARATTR_SHARED = (1 << 2),

     MOJOSHADER_AST_VARATTR_STATIC = (1 << 3),

     MOJOSHADER_AST_VARATTR_UNIFORM = (1 << 4),

     MOJOSHADER_AST_VARATTR_VOLATILE = (1 << 5),

     MOJOSHADER_AST_VARATTR_CONST = (1 << 6),

     MOJOSHADER_AST_VARATTR_ROWMAJOR = (1 << 7),

     MOJOSHADER_AST_VARATTR_COLUMNMAJOR = (1 << 8)

 } MOJOSHADER_astVariableAttributes;

 typedef enum MOJOSHADER_astIfAttributes

 {

     MOJOSHADER_AST_IFATTR_NONE,

     MOJOSHADER_AST_IFATTR_BRANCH,

     MOJOSHADER_AST_IFATTR_FLATTEN,

     MOJOSHADER_AST_IFATTR_IFALL,

     MOJOSHADER_AST_IFATTR_IFANY,

     MOJOSHADER_AST_IFATTR_PREDICATE,

     MOJOSHADER_AST_IFATTR_PREDICATEBLOCK,

 } MOJOSHADER_astIfAttributes;

 typedef enum MOJOSHADER_astSwitchAttributes

 {

     MOJOSHADER_AST_SWITCHATTR_NONE,

     MOJOSHADER_AST_SWITCHATTR_FLATTEN,

     MOJOSHADER_AST_SWITCHATTR_BRANCH,

     MOJOSHADER_AST_SWITCHATTR_FORCECASE,

     MOJOSHADER_AST_SWITCHATTR_CALL

 } MOJOSHADER_astSwitchAttributes;

 /* You can cast any AST node pointer to this. */

 typedef struct MOJOSHADER_astGeneric

 {

     MOJOSHADER_astNodeInfo ast;

 } MOJOSHADER_astGeneric;

 typedef struct MOJOSHADER_astExpression

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

 } MOJOSHADER_astExpression;

 typedef struct MOJOSHADER_astArguments

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_ARGUMENTS */

     MOJOSHADER_astExpression *argument;

     struct MOJOSHADER_astArguments *next;

 } MOJOSHADER_astArguments;

 typedef struct MOJOSHADER_astExpressionUnary

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astExpression *operand;

 } MOJOSHADER_astExpressionUnary;

 typedef struct MOJOSHADER_astExpressionBinary

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astExpression *left;

     MOJOSHADER_astExpression *right;

 } MOJOSHADER_astExpressionBinary;

 typedef struct MOJOSHADER_astExpressionTernary

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astExpression *left;

     MOJOSHADER_astExpression *center;

     MOJOSHADER_astExpression *right;

 } MOJOSHADER_astExpressionTernary;

 /* Identifier indexes aren't available until semantic analysis phase completes.

  *  It provides a unique id for this identifier's variable.

  *  It will be negative for global scope, positive for function scope

  *  (global values are globally unique, function values are only

  *  unique within the scope of the given function). There's a different

  *  set of indices if this identifier is a function (positive for

  *  user-defined functions, negative for intrinsics).

  *  May be zero for various reasons (unknown identifier, etc).

  */

 typedef struct MOJOSHADER_astExpressionIdentifier

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_IDENTIFIER */

     const MOJOSHADER_astDataType *datatype;

     const char *identifier;

     int index;

 } MOJOSHADER_astExpressionIdentifier;

 typedef struct MOJOSHADER_astExpressionIntLiteral

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_INT_LITERAL */

     const MOJOSHADER_astDataType *datatype;  /* always AST_DATATYPE_INT */

     int value;

 } MOJOSHADER_astExpressionIntLiteral;

 typedef struct MOJOSHADER_astExpressionFloatLiteral

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_FLOAT_LITERAL */

     const MOJOSHADER_astDataType *datatype;  /* always AST_DATATYPE_FLOAT */

     double value;

 } MOJOSHADER_astExpressionFloatLiteral;

 typedef struct MOJOSHADER_astExpressionStringLiteral

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_STRING_LITERAL */

     const MOJOSHADER_astDataType *datatype;  /* always AST_DATATYPE_STRING */

     const char *string;

 } MOJOSHADER_astExpressionStringLiteral;

 typedef struct MOJOSHADER_astExpressionBooleanLiteral

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_BOOLEAN_LITERAL */

     const MOJOSHADER_astDataType *datatype;  /* always AST_DATATYPE_BOOL */

     int value;  /* Always 1 or 0. */

 } MOJOSHADER_astExpressionBooleanLiteral;

 typedef struct MOJOSHADER_astExpressionConstructor

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_CONSTRUCTOR */

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astArguments *args;

 } MOJOSHADER_astExpressionConstructor;

 typedef struct MOJOSHADER_astExpressionDerefStruct

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_DEREF_STRUCT */

     const MOJOSHADER_astDataType *datatype;

     /* !!! FIXME:

      *  "identifier" is misnamed; this might not be an identifier at all:

      *    x = FunctionThatReturnsAStruct().SomeMember;

      */

     MOJOSHADER_astExpression *identifier;

     const char *member;

     int isswizzle;  /* Always 1 or 0. Never set by parseAst()! */

     int member_index;  /* Never set by parseAst()! */

 } MOJOSHADER_astExpressionDerefStruct;

 typedef struct MOJOSHADER_astExpressionCallFunction

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_CALLFUNC */

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astExpressionIdentifier *identifier;

     MOJOSHADER_astArguments *args;

 } MOJOSHADER_astExpressionCallFunction;

 typedef struct MOJOSHADER_astExpressionCast

 {

     MOJOSHADER_astNodeInfo ast;  /* Always MOJOSHADER_AST_OP_CAST */

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astExpression *operand;

 } MOJOSHADER_astExpressionCast;

 typedef struct MOJOSHADER_astCompilationUnit

 {

     MOJOSHADER_astNodeInfo ast;

     struct MOJOSHADER_astCompilationUnit *next;

 } MOJOSHADER_astCompilationUnit;

 typedef enum MOJOSHADER_astFunctionStorageClass

 {

     MOJOSHADER_AST_FNSTORECLS_NONE,

     MOJOSHADER_AST_FNSTORECLS_INLINE

 } MOJOSHADER_astFunctionStorageClass;

 typedef enum MOJOSHADER_astInputModifier

 {

     MOJOSHADER_AST_INPUTMOD_NONE,

     MOJOSHADER_AST_INPUTMOD_IN,

     MOJOSHADER_AST_INPUTMOD_OUT,

     MOJOSHADER_AST_INPUTMOD_INOUT,

     MOJOSHADER_AST_INPUTMOD_UNIFORM

 } MOJOSHADER_astInputModifier;

 typedef enum MOJOSHADER_astInterpolationModifier

 {

     MOJOSHADER_AST_INTERPMOD_NONE,

     MOJOSHADER_AST_INTERPMOD_LINEAR,

     MOJOSHADER_AST_INTERPMOD_CENTROID,

     MOJOSHADER_AST_INTERPMOD_NOINTERPOLATION,

     MOJOSHADER_AST_INTERPMOD_NOPERSPECTIVE,

     MOJOSHADER_AST_INTERPMOD_SAMPLE

 } MOJOSHADER_astInterpolationModifier;

 typedef struct MOJOSHADER_astFunctionParameters

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astInputModifier input_modifier;

     const char *identifier;

     const char *semantic;

     MOJOSHADER_astInterpolationModifier interpolation_modifier;

     MOJOSHADER_astExpression *initializer;

     struct MOJOSHADER_astFunctionParameters *next;

 } MOJOSHADER_astFunctionParameters;

 typedef struct MOJOSHADER_astFunctionSignature

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     const char *identifier;

     MOJOSHADER_astFunctionParameters *params;

     MOJOSHADER_astFunctionStorageClass storage_class;

     const char *semantic;

 } MOJOSHADER_astFunctionSignature;

 typedef struct MOJOSHADER_astScalarOrArray

 {

     MOJOSHADER_astNodeInfo ast;

     const char *identifier;

     int isarray;  /* boolean: 1 or 0 */

     MOJOSHADER_astExpression *dimension;

 } MOJOSHADER_astScalarOrArray;

 typedef struct MOJOSHADER_astAnnotations

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astExpression *initializer;

     struct MOJOSHADER_astAnnotations *next;

 } MOJOSHADER_astAnnotations;

 typedef struct MOJOSHADER_astPackOffset

 {

     MOJOSHADER_astNodeInfo ast;

     const char *ident1;   /* !!! FIXME: rename this. */

     const char *ident2;

 } MOJOSHADER_astPackOffset;

 typedef struct MOJOSHADER_astVariableLowLevel

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astPackOffset *packoffset;

     const char *register_name;

 } MOJOSHADER_astVariableLowLevel;

 typedef struct MOJOSHADER_astStructMembers

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     const char *semantic;

     MOJOSHADER_astScalarOrArray *details;

     MOJOSHADER_astInterpolationModifier interpolation_mod;

     struct MOJOSHADER_astStructMembers *next;

 } MOJOSHADER_astStructMembers;

 typedef struct MOJOSHADER_astStructDeclaration

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     const char *name;

     MOJOSHADER_astStructMembers *members;

 } MOJOSHADER_astStructDeclaration;

 typedef struct MOJOSHADER_astVariableDeclaration

 {

     MOJOSHADER_astNodeInfo ast;

     int attributes;

     const MOJOSHADER_astDataType *datatype;

     MOJOSHADER_astStructDeclaration *anonymous_datatype;

     MOJOSHADER_astScalarOrArray *details;

     const char *semantic;

     MOJOSHADER_astAnnotations *annotations;

     MOJOSHADER_astExpression *initializer;

     MOJOSHADER_astVariableLowLevel *lowlevel;

     struct MOJOSHADER_astVariableDeclaration *next;

 } MOJOSHADER_astVariableDeclaration;

 typedef struct MOJOSHADER_astStatement

 {

     MOJOSHADER_astNodeInfo ast;

     struct MOJOSHADER_astStatement *next;

 } MOJOSHADER_astStatement;

 typedef MOJOSHADER_astStatement MOJOSHADER_astEmptyStatement;

 typedef MOJOSHADER_astStatement MOJOSHADER_astBreakStatement;

 typedef MOJOSHADER_astStatement MOJOSHADER_astContinueStatement;

 typedef MOJOSHADER_astStatement MOJOSHADER_astDiscardStatement;

 /* something enclosed in "{}" braces. */

 typedef struct MOJOSHADER_astBlockStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     MOJOSHADER_astStatement *statements;  /* list of child statements. */

 } MOJOSHADER_astBlockStatement;

 typedef struct MOJOSHADER_astReturnStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     MOJOSHADER_astExpression *expr;

 } MOJOSHADER_astReturnStatement;

 typedef struct MOJOSHADER_astExpressionStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     MOJOSHADER_astExpression *expr;

 } MOJOSHADER_astExpressionStatement;

 typedef struct MOJOSHADER_astIfStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     int attributes;

     MOJOSHADER_astExpression *expr;

     MOJOSHADER_astStatement *statement;

     MOJOSHADER_astStatement *else_statement;

 } MOJOSHADER_astIfStatement;

 typedef struct MOJOSHADER_astSwitchCases

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astExpression *expr;

     MOJOSHADER_astStatement *statement;

     struct MOJOSHADER_astSwitchCases *next;

 } MOJOSHADER_astSwitchCases;

 typedef struct MOJOSHADER_astSwitchStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     int attributes;

     MOJOSHADER_astExpression *expr;

     MOJOSHADER_astSwitchCases *cases;

 } MOJOSHADER_astSwitchStatement;

 typedef struct MOJOSHADER_astWhileStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     int unroll;  /* # times to unroll, 0 to loop, < 0 == compiler's choice. */

     MOJOSHADER_astExpression *expr;

     MOJOSHADER_astStatement *statement;

 } MOJOSHADER_astWhileStatement;

 typedef MOJOSHADER_astWhileStatement MOJOSHADER_astDoStatement;

 typedef struct MOJOSHADER_astForStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     int unroll;  /* # times to unroll, 0 to loop, < 0 == compiler's choice. */

     MOJOSHADER_astVariableDeclaration *var_decl;  /* either this ... */

     MOJOSHADER_astExpression *initializer;        /*  ... or this will used. */

     MOJOSHADER_astExpression *looptest;

     MOJOSHADER_astExpression *counter;

     MOJOSHADER_astStatement *statement;

 } MOJOSHADER_astForStatement;

 typedef struct MOJOSHADER_astTypedef

 {

     MOJOSHADER_astNodeInfo ast;

     const MOJOSHADER_astDataType *datatype;

     int isconst;  /* boolean: 1 or 0 */

     MOJOSHADER_astScalarOrArray *details;

 } MOJOSHADER_astTypedef;

 typedef struct MOJOSHADER_astTypedefStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     MOJOSHADER_astTypedef *type_info;

 } MOJOSHADER_astTypedefStatement;

 typedef struct MOJOSHADER_astVarDeclStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     MOJOSHADER_astVariableDeclaration *declaration;

 } MOJOSHADER_astVarDeclStatement;

 typedef struct MOJOSHADER_astStructStatement

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astStatement *next;

     MOJOSHADER_astStructDeclaration *struct_info;

 } MOJOSHADER_astStructStatement;

 typedef struct MOJOSHADER_astCompilationUnitFunction

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astCompilationUnit *next;

     MOJOSHADER_astFunctionSignature *declaration;

     MOJOSHADER_astStatement *definition;

     int index;  /* unique id. Will be 0 until semantic analysis runs. */

 } MOJOSHADER_astCompilationUnitFunction;

 typedef struct MOJOSHADER_astCompilationUnitTypedef

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astCompilationUnit *next;

     MOJOSHADER_astTypedef *type_info;

 } MOJOSHADER_astCompilationUnitTypedef;

 typedef struct MOJOSHADER_astCompilationUnitStruct

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astCompilationUnit *next;

     MOJOSHADER_astStructDeclaration *struct_info;

 } MOJOSHADER_astCompilationUnitStruct;

 typedef struct MOJOSHADER_astCompilationUnitVariable

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astCompilationUnit *next;

     MOJOSHADER_astVariableDeclaration *declaration;

 } MOJOSHADER_astCompilationUnitVariable;

 /* this is way cleaner than all the nasty typecasting. */

 typedef union MOJOSHADER_astNode

 {

     MOJOSHADER_astNodeInfo ast;

     MOJOSHADER_astGeneric generic;

     MOJOSHADER_astExpression expression;

     MOJOSHADER_astArguments arguments;

     MOJOSHADER_astExpressionUnary unary;

     MOJOSHADER_astExpressionBinary binary;

     MOJOSHADER_astExpressionTernary ternary;

     MOJOSHADER_astExpressionIdentifier identifier;

     MOJOSHADER_astExpressionIntLiteral intliteral;

     MOJOSHADER_astExpressionFloatLiteral floatliteral;

     MOJOSHADER_astExpressionStringLiteral stringliteral;

     MOJOSHADER_astExpressionBooleanLiteral boolliteral;

     MOJOSHADER_astExpressionConstructor constructor;

     MOJOSHADER_astExpressionDerefStruct derefstruct;

     MOJOSHADER_astExpressionCallFunction callfunc;

     MOJOSHADER_astExpressionCast cast;

     MOJOSHADER_astCompilationUnit compunit;

     MOJOSHADER_astFunctionParameters params;

     MOJOSHADER_astFunctionSignature funcsig;

     MOJOSHADER_astScalarOrArray soa;

     MOJOSHADER_astAnnotations annotations;

     MOJOSHADER_astPackOffset packoffset;

     MOJOSHADER_astVariableLowLevel varlowlevel;

     MOJOSHADER_astStructMembers structmembers;

     MOJOSHADER_astStructDeclaration structdecl;

     MOJOSHADER_astVariableDeclaration vardecl;

     MOJOSHADER_astStatement stmt;

     MOJOSHADER_astEmptyStatement emptystmt;

     MOJOSHADER_astBreakStatement breakstmt;

     MOJOSHADER_astContinueStatement contstmt;

     MOJOSHADER_astDiscardStatement discardstmt;

     MOJOSHADER_astBlockStatement blockstmt;

     MOJOSHADER_astReturnStatement returnstmt;

     MOJOSHADER_astExpressionStatement exprstmt;

     MOJOSHADER_astIfStatement ifstmt;

     MOJOSHADER_astSwitchCases cases;

     MOJOSHADER_astSwitchStatement switchstmt;

     MOJOSHADER_astWhileStatement whilestmt;

     MOJOSHADER_astDoStatement dostmt;

     MOJOSHADER_astForStatement forstmt;

     MOJOSHADER_astTypedef typdef;

     MOJOSHADER_astTypedefStatement typedefstmt;

     MOJOSHADER_astVarDeclStatement vardeclstmt;

     MOJOSHADER_astStructStatement structstmt;

     MOJOSHADER_astCompilationUnitFunction funcunit;

     MOJOSHADER_astCompilationUnitTypedef typedefunit;

     MOJOSHADER_astCompilationUnitStruct structunit;

     MOJOSHADER_astCompilationUnitVariable varunit;

 } MOJOSHADER_astNode;

 /*

  * Structure used to return data from parsing of a shader into an AST...

  */

 /* !!! FIXME: most of these ints should be unsigned. */

 typedef struct MOJOSHADER_astData

 {

     /*

      * The number of elements pointed to by (errors).

      */

     int error_count;

     /*

      * (error_count) elements of data that specify errors that were generated

      *  by parsing this shader.

      * This can be NULL if there were no errors or if (error_count) is zero.

      *  Note that this will only produce errors for syntax problems. Most of

      *  the things we expect a compiler to produce errors for--incompatible

      *  types, unknown identifiers, etc--are not checked at all during

      *  initial generation of the syntax tree...bogus programs that would

      *  fail to compile will pass here without error, if they are syntactically

      *  correct!

      */

     MOJOSHADER_error *errors;

     /*

      * The name of the source profile used to parse the shader. Will be NULL

      *  on error.

      */

     const char *source_profile;

     /*

      * The actual syntax tree. You are responsible for walking it yourself.

      *  CompilationUnits are always the top of the tree (functions, typedefs,

      *  global variables, etc). Will be NULL on error.

      */

     const MOJOSHADER_astNode *ast;

     /*

      * This is the malloc implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_malloc malloc;

     /*

      * This is the free implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_free free;

     /*

      * This is the pointer you passed as opaque data for your allocator.

      */

     void *malloc_data;

     /*

      * This is internal data, and not for the application to touch.

      */

     void *opaque;

 } MOJOSHADER_astData;

 /*

  * You almost certainly don't need this function, unless you absolutely know

  *  why you need it without hesitation. This is almost certainly only good for

  *  building code analysis tools on top of.

  *

  * This is intended to parse HLSL source code, turning it into an abstract

  *  syntax tree.

  *

  * (srcprofile) specifies the source language of the shader. You can specify

  *  a shader model with this, too. See MOJOSHADER_SRC_PROFILE_* constants.

  *

  * (filename) is a NULL-terminated UTF-8 filename. It can be NULL. We do not

  *  actually access this file, as we obtain our data from (source). This

  *  string is copied when we need to report errors while processing (source),

  *  as opposed to errors in a file referenced via the #include directive in

  *  (source). If this is NULL, then errors will report the filename as NULL,

  *  too.

  *

  * (source) is an UTF-8 string of valid high-level shader source code.

  *  It does not need to be NULL-terminated.

  *

  * (sourcelen) is the length of the string pointed to by (source), in bytes.

  *

  * (defines) points to (define_count) preprocessor definitions, and can be

  *  NULL. These are treated by the preprocessor as if the source code started

  *  with one #define for each entry you pass in here.

  *

  * (include_open) and (include_close) let the app control the preprocessor's

  *  behaviour for #include statements. Both are optional and can be NULL, but

  *  both must be specified if either is specified.

  *

  * This will return a MOJOSHADER_astData. The data supplied here gives the

  *  application a tree-like structure they can walk to see the layout of

  *  a given program. When you are done with this data, pass it to

  *  MOJOSHADER_freeCompileData() to deallocate resources.

  *

  * This function will never return NULL, even if the system is completely

  *  out of memory upon entry (in which case, this function returns a static

  *  MOJOSHADER_astData object, which is still safe to pass to

  *  MOJOSHADER_freeAstData()).

  *

  * As parsing requires some memory to be allocated, you may provide a

  *  custom allocator to this function, which will be used to allocate/free

  *  memory. They function just like malloc() and free(). We do not use

  *  realloc(). If you don't care, pass NULL in for the allocator functions.

  *  If your allocator needs instance-specific data, you may supply it with the

  *  (d) parameter. This pointer is passed as-is to your (m) and (f) functions.

  *

  * This function is thread safe, so long as the various callback functions

  *  are, too, and that the parameters remains intact for the duration of the

  *  call. This allows you to parse several shaders on separate CPU cores

  *  at the same time.

  */

 const MOJOSHADER_astData *MOJOSHADER_parseAst(const char *srcprofile,

                                     const char *filename, const char *source,

                                     unsigned int sourcelen,

                                     const MOJOSHADER_preprocessorDefine *defs,

                                     unsigned int define_count,

                                     MOJOSHADER_includeOpen include_open,

                                     MOJOSHADER_includeClose include_close,

                                     MOJOSHADER_malloc m, MOJOSHADER_free f,

                                     void *d);

 /* !!! FIXME: expose semantic analysis to the public API? */

 /*

  * Call this to dispose of AST parsing results when you are done with them.

  *  This will call the MOJOSHADER_free function you provided to

  *  MOJOSHADER_parseAst() multiple times, if you provided one.

  *  Passing a NULL here is a safe no-op.

  *

  * This function is thread safe, so long as any allocator you passed into

  *  MOJOSHADER_parseAst() is, too.

  */

 void MOJOSHADER_freeAstData(const MOJOSHADER_astData *data);

 /* Intermediate Representation interface... */

 /* !!! FIXME: there is currently no way to access the IR via the public API. */

 typedef enum MOJOSHADER_irNodeType

 {

     MOJOSHADER_IR_START_RANGE_EXPR,

     MOJOSHADER_IR_CONSTANT,

     MOJOSHADER_IR_TEMP,

     MOJOSHADER_IR_BINOP,

     MOJOSHADER_IR_MEMORY,

     MOJOSHADER_IR_CALL,

     MOJOSHADER_IR_ESEQ,

     MOJOSHADER_IR_ARRAY,

     MOJOSHADER_IR_CONVERT,

     MOJOSHADER_IR_SWIZZLE,

     MOJOSHADER_IR_CONSTRUCT,

     MOJOSHADER_IR_END_RANGE_EXPR,

     MOJOSHADER_IR_START_RANGE_STMT,

     MOJOSHADER_IR_MOVE,

     MOJOSHADER_IR_EXPR_STMT,

     MOJOSHADER_IR_JUMP,

     MOJOSHADER_IR_CJUMP,

     MOJOSHADER_IR_SEQ,

     MOJOSHADER_IR_LABEL,

     MOJOSHADER_IR_DISCARD,

     MOJOSHADER_IR_END_RANGE_STMT,

     MOJOSHADER_IR_START_RANGE_MISC,

     MOJOSHADER_IR_EXPRLIST,

     MOJOSHADER_IR_END_RANGE_MISC,

     MOJOSHADER_IR_END_RANGE

 } MOJOSHADER_irNodeType;

 typedef struct MOJOSHADER_irNodeInfo

 {

     MOJOSHADER_irNodeType type;

     const char *filename;

     unsigned int line;

 } MOJOSHADER_irNodeInfo;

 typedef struct MOJOSHADER_irExprList MOJOSHADER_irExprList;

 /*

  * IR nodes are categorized into Expressions, Statements, and Everything Else.

  *  You can cast any of them to MOJOSHADER_irGeneric, but this split is

  *  useful for slightly better type-checking (you can't cleanly assign

  *  something that doesn't return a value to something that wants one, etc).

  * These broader categories are just unions of the simpler types, so the

  *  real definitions are below all the things they contain (but these

  *  predeclarations are because the simpler types refer to the broader

  *  categories).

  */

 typedef union MOJOSHADER_irExpression MOJOSHADER_irExpression;  /* returns a value. */

 typedef union MOJOSHADER_irStatement MOJOSHADER_irStatement;   /* no returned value. */

 typedef union MOJOSHADER_irMisc MOJOSHADER_irMisc;        /* Everything Else. */

 typedef union MOJOSHADER_irNode MOJOSHADER_irNode;        /* Generic uber-wrapper. */

 /* You can cast any IR node pointer to this. */

 typedef struct MOJOSHADER_irGeneric

 {

     MOJOSHADER_irNodeInfo ir;

 } MOJOSHADER_irGeneric;

 /* These are used for MOJOSHADER_irBinOp */

 typedef enum MOJOSHADER_irBinOpType

 {

     MOJOSHADER_IR_BINOP_ADD,

     MOJOSHADER_IR_BINOP_SUBTRACT,

     MOJOSHADER_IR_BINOP_MULTIPLY,

     MOJOSHADER_IR_BINOP_DIVIDE,

     MOJOSHADER_IR_BINOP_MODULO,

     MOJOSHADER_IR_BINOP_AND,

     MOJOSHADER_IR_BINOP_OR,

     MOJOSHADER_IR_BINOP_XOR,

     MOJOSHADER_IR_BINOP_LSHIFT,

     MOJOSHADER_IR_BINOP_RSHIFT,

     MOJOSHADER_IR_BINOP_UNKNOWN

 } MOJOSHADER_irBinOpType;

 typedef enum MOJOSHADER_irConditionType

 {

     MOJOSHADER_IR_COND_EQL,

     MOJOSHADER_IR_COND_NEQ,

     MOJOSHADER_IR_COND_LT,

     MOJOSHADER_IR_COND_GT,

     MOJOSHADER_IR_COND_LEQ,

     MOJOSHADER_IR_COND_GEQ,

     MOJOSHADER_IR_COND_UNKNOWN

 } MOJOSHADER_irConditionType;

 /* MOJOSHADER_irExpression types... */

 typedef struct MOJOSHADER_irExprInfo

 {

     MOJOSHADER_irNodeInfo ir;

     MOJOSHADER_astDataTypeType type;

     int elements;

 } MOJOSHADER_irExprInfo;

 typedef struct MOJOSHADER_irConstant    /* Constant value */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_CONSTANT */

     union

     {

         int ival[16];

         float fval[16];

     } value;

 } MOJOSHADER_irConstant;

 typedef struct MOJOSHADER_irTemp /* temp value (not necessarily a register). */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_TEMP */

     int index;

 } MOJOSHADER_irTemp;

 typedef struct MOJOSHADER_irBinOp  /* binary operator (+, -, etc) */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_BINOP */

     MOJOSHADER_irBinOpType op;

     MOJOSHADER_irExpression *left;

     MOJOSHADER_irExpression *right;

 } MOJOSHADER_irBinOp;

 typedef struct MOJOSHADER_irMemory

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_MEMORY */

     int index;  /* not final addresses, just a unique identifier. */

 } MOJOSHADER_irMemory;

 typedef struct MOJOSHADER_irCall

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_CALL */

     int index;

     MOJOSHADER_irExprList *args;

 } MOJOSHADER_irCall;

 typedef struct MOJOSHADER_irESeq  /* statement with result */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_ESEQ */

     MOJOSHADER_irStatement *stmt;  /* execute this for side-effects, then... */

     MOJOSHADER_irExpression *expr; /* ...use this for the result. */

 } MOJOSHADER_irESeq;

 typedef struct MOJOSHADER_irArray  /* Array dereference. */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_ARRAY */

     MOJOSHADER_irExpression *array;

     MOJOSHADER_irExpression *element;

 } MOJOSHADER_irArray;

 typedef struct MOJOSHADER_irConvert  /* casting between datatypes */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_CONVERT */

     MOJOSHADER_irExpression *expr;

 } MOJOSHADER_irConvert;

 typedef struct MOJOSHADER_irSwizzle  /* vector swizzle */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_SWIZZLE */

     MOJOSHADER_irExpression *expr;

     char channels[4];

 } MOJOSHADER_irSwizzle;

 typedef struct MOJOSHADER_irConstruct  /* vector construct from discrete items */

 {

     MOJOSHADER_irExprInfo info;  /* Always MOJOSHADER_IR_CONTSTRUCT */

     MOJOSHADER_irExprList *args;

 } MOJOSHADER_irConstruct;

 /* Wrap the whole category in a union for type "safety." */

 union MOJOSHADER_irExpression

 {

     MOJOSHADER_irNodeInfo ir;

     MOJOSHADER_irExprInfo info;

     MOJOSHADER_irConstant constant;

     MOJOSHADER_irTemp temp;

     MOJOSHADER_irBinOp binop;

     MOJOSHADER_irMemory memory;

     MOJOSHADER_irCall call;

     MOJOSHADER_irESeq eseq;

     MOJOSHADER_irArray array;

     MOJOSHADER_irConvert convert;

     MOJOSHADER_irSwizzle swizzle;

     MOJOSHADER_irConstruct construct;

 };

 /* MOJOSHADER_irStatement types. */

 typedef struct MOJOSHADER_irMove  /* load/store. */

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_MOVE */

     MOJOSHADER_irExpression *dst; /* must result in a temp or mem! */

     MOJOSHADER_irExpression *src;

     int writemask;  // for write-masking vector channels.

 } MOJOSHADER_irMove;

 typedef struct MOJOSHADER_irExprStmt  /* evaluate expression, throw it away. */

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_EXPR_STMT */

     MOJOSHADER_irExpression *expr;

 } MOJOSHADER_irExprStmt;

 typedef struct MOJOSHADER_irJump  /* unconditional jump */

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_JUMP */

     int label;

     // !!! FIXME: possible label list, for further optimization passes.

 } MOJOSHADER_irJump;

 typedef struct MOJOSHADER_irCJump  /* conditional jump */

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_CJUMP */

     MOJOSHADER_irConditionType cond;

     MOJOSHADER_irExpression *left;  /* if (left cond right) */

     MOJOSHADER_irExpression *right;

     int iftrue;  /* label id for true case. */

     int iffalse; /* label id for false case. */

 } MOJOSHADER_irCJump;

 typedef struct MOJOSHADER_irSeq  /* statement without side effects */

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_SEQ */

     MOJOSHADER_irStatement *first;

     MOJOSHADER_irStatement *next;

 } MOJOSHADER_irSeq;

 typedef struct MOJOSHADER_irLabel  /* like a label in assembly language. */

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_LABEL */

     int index;

 } MOJOSHADER_irLabel;

 typedef MOJOSHADER_irGeneric MOJOSHADER_irDiscard;  /* discard statement. */

 /* Wrap the whole category in a union for type "safety." */

 union MOJOSHADER_irStatement

 {

     MOJOSHADER_irNodeInfo ir;

     MOJOSHADER_irGeneric generic;

     MOJOSHADER_irMove move;

     MOJOSHADER_irExprStmt expr;

     MOJOSHADER_irJump jump;

     MOJOSHADER_irCJump cjump;

     MOJOSHADER_irSeq seq;

     MOJOSHADER_irLabel label;

     MOJOSHADER_irDiscard discard;

 };

 /* MOJOSHADER_irMisc types. */

 struct MOJOSHADER_irExprList

 {

     MOJOSHADER_irNodeInfo ir;  /* Always MOJOSHADER_IR_EXPRLIST */

     MOJOSHADER_irExpression *expr;

     MOJOSHADER_irExprList *next;

 };

 /* Wrap the whole category in a union for type "safety." */

 union MOJOSHADER_irMisc

 {

     MOJOSHADER_irNodeInfo ir;

     MOJOSHADER_irGeneric generic;

     MOJOSHADER_irExprList exprlist;

 };

 /* This is a catchall for all your needs. :) */

 union MOJOSHADER_irNode

 {

     MOJOSHADER_irNodeInfo ir;

     MOJOSHADER_irGeneric generic;

     MOJOSHADER_irExpression expr;

     MOJOSHADER_irStatement stmt;

     MOJOSHADER_irMisc misc;

 };

 /* Compiler interface... */

 /*

  * Structure used to return data from parsing of a shader...

  */

 /* !!! FIXME: most of these ints should be unsigned. */

 typedef struct MOJOSHADER_compileData

 {

     /*

      * The number of elements pointed to by (errors).

      */

     int error_count;

     /*

      * (error_count) elements of data that specify errors that were generated

      *  by compiling this shader.

      * This can be NULL if there were no errors or if (error_count) is zero.

      */

     MOJOSHADER_error *errors;

     /*

      * The number of elements pointed to by (warnings).

      */

     int warning_count;

     /*

      * (warning_count) elements of data that specify errors that were

      *  generated by compiling this shader.

      * This can be NULL if there were no errors or if (warning_count) is zero.

      */

     MOJOSHADER_error *warnings;

     /*

      * The name of the source profile used to compile the shader. Will be NULL

      *  on error.

      */

     const char *source_profile;

     /*

      * Bytes of output from compiling. This will be a null-terminated ASCII

      *  string of D3D assembly source code.

      */

     const char *output;

     /*

      * Byte count for output, not counting any null terminator.

      *  Will be 0 on error.

      */

     int output_len;

     /*

      * The number of elements pointed to by (symbols).

      */

     int symbol_count;

     /*

      * (symbol_count) elements of data that specify high-level symbol data

      *  for the shader. This can be used by MOJOSHADER_assemble() to

      *  generate a CTAB section in bytecode, which is needed by

      *  MOJOSHADER_parseData() to handle some shaders. This can be NULL on

      *  error or if (symbol_count) is zero.

      */

     MOJOSHADER_symbol *symbols;

     /*

      * This is the malloc implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_malloc malloc;

     /*

      * This is the free implementation you passed to MOJOSHADER_parse().

      */

     MOJOSHADER_free free;

     /*

      * This is the pointer you passed as opaque data for your allocator.

      */

     void *malloc_data;

 } MOJOSHADER_compileData;

 /*

  * This function is optional. Use this to compile high-level shader programs.

  *

  * This is intended to turn HLSL source code into D3D assembly code, which

  *  can then be passed to MOJOSHADER_assemble() to convert it to D3D bytecode

  *  (which can then be used with MOJOSHADER_parseData() to support other

  *  shading targets).

  *

  * (srcprofile) specifies the source language of the shader. You can specify

  *  a shader model with this, too. See MOJOSHADER_SRC_PROFILE_* constants.

  *

  * (filename) is a NULL-terminated UTF-8 filename. It can be NULL. We do not

  *  actually access this file, as we obtain our data from (source). This

  *  string is copied when we need to report errors while processing (source),

  *  as opposed to errors in a file referenced via the #include directive in

  *  (source). If this is NULL, then errors will report the filename as NULL,

  *  too.

  *

  * (source) is an UTF-8 string of valid high-level shader source code.

  *  It does not need to be NULL-terminated.

  *

  * (sourcelen) is the length of the string pointed to by (source), in bytes.

  *

  * (defines) points to (define_count) preprocessor definitions, and can be

  *  NULL. These are treated by the preprocessor as if the source code started

  *  with one #define for each entry you pass in here.

  *

  * (include_open) and (include_close) let the app control the preprocessor's

  *  behaviour for #include statements. Both are optional and can be NULL, but

  *  both must be specified if either is specified.

  *

  * This will return a MOJOSHADER_compileData. The data supplied here is

  *  sufficient to supply to MOJOSHADER_assemble() for further processing.

  *  When you are done with this data, pass it to MOJOSHADER_freeCompileData()

  *  to deallocate resources.

  *

  * This function will never return NULL, even if the system is completely

  *  out of memory upon entry (in which case, this function returns a static

  *  MOJOSHADER_compileData object, which is still safe to pass to

  *  MOJOSHADER_freeCompileData()).

  *

  * As compiling requires some memory to be allocated, you may provide a

  *  custom allocator to this function, which will be used to allocate/free

  *  memory. They function just like malloc() and free(). We do not use

  *  realloc(). If you don't care, pass NULL in for the allocator functions.

  *  If your allocator needs instance-specific data, you may supply it with the

  *  (d) parameter. This pointer is passed as-is to your (m) and (f) functions.

  *

  * This function is thread safe, so long as the various callback functions

  *  are, too, and that the parameters remains intact for the duration of the

  *  call. This allows you to compile several shaders on separate CPU cores

  *  at the same time.

  */

 const MOJOSHADER_compileData *MOJOSHADER_compile(const char *srcprofile,

                                     const char *filename, const char *source,

                                     unsigned int sourcelen,

                                     const MOJOSHADER_preprocessorDefine *defs,

                                     unsigned int define_count,

                                     MOJOSHADER_includeOpen include_open,

                                     MOJOSHADER_includeClose include_close,

                                     MOJOSHADER_malloc m, MOJOSHADER_free f,

                                     void *d);

 /*

  * Call this to dispose of compile results when you are done with them.

  *  This will call the MOJOSHADER_free function you provided to

  *  MOJOSHADER_compile() multiple times, if you provided one.

  *  Passing a NULL here is a safe no-op.

  *

  * This function is thread safe, so long as any allocator you passed into

  *  MOJOSHADER_compile() is, too.

  */

 void MOJOSHADER_freeCompileData(const MOJOSHADER_compileData *data);

 /* OpenGL interface... */

 /*

  * Signature for function lookup callbacks. MojoShader will call a function

  *  you provide to get OpenGL entry points (both standard functions and

  *  extensions). Through this, MojoShader never links directly to OpenGL,

  *  but relies on you to provide the implementation. This means you can

  *  swap in different drivers, or hook functions (log every GL call MojoShader

  *  makes, etc).

  *

  * (fnname) is the function name we want the address for ("glBegin" or

  *  whatever. (data) is a void pointer you provide, if this callback needs

  *  extra information. If you don't need it, you may specify NULL.

  *

  * Return the entry point on success, NULL if it couldn't be found.

  *  Note that this could ask for standard entry points like glEnable(), or

  *  extensions like glProgramLocalParameterI4ivNV(), so you might need

  *  to check two places to find the desired entry point, depending on your

  *  platform (Windows might need to look in OpenGL32.dll and use WGL, etc).

  */

 typedef void *(*MOJOSHADER_glGetProcAddress)(const char *fnname, void *data);

 /*

  * "Contexts" map to OpenGL contexts...you need one per window, or whatever,

  *  and need to inform MojoShader when you make a new one current.

  *

  * "Shaders" refer to individual vertex or pixel programs, and are created

  *  by "compiling" Direct3D shader bytecode. A vertex and pixel shader are

  *  "linked" into a "Program" before you can use them to render.

  *

  * To the calling application, these are all opaque handles.

  */

 typedef struct MOJOSHADER_glContext MOJOSHADER_glContext;

 typedef struct MOJOSHADER_glShader MOJOSHADER_glShader;

 typedef struct MOJOSHADER_glProgram MOJOSHADER_glProgram;

 /*

  * Get a list of available profiles. This will fill in the array (profs)

  *  with up to (size) pointers of profiles that the current system can handle;

  *  that is, the profiles are built into MojoShader and the OpenGL extensions

  *  required for them exist at runtime. This function returns the number of

  *  available profiles, which may be more, less, or equal to (size).

  *

  * If there are more than (size) profiles, the (profs) buffer will not

  *  overflow. You can check the return value for the total number of

  *  available profiles, allocate more space, and try again if necessary.

  *  Calling this function with (size) == 0 is legal.

  *

  * You can only call this AFTER you have successfully built your GL context

  *  and made it current. This function will lookup the GL functions it needs

  *  through the callback you supply, via (lookup) and (d). The lookup function

  *  is neither stored nor used by MojoShader after this function returns, nor

  *  are the functions it might look up.

  *

  * You should not free any strings returned from this function; they are

  *  pointers to internal, probably static, memory.

  *

  * This call is NOT thread safe! As most OpenGL implementations are not thread

  *  safe, you should probably only call this from the same thread that created

  *  the GL context.

  */

 int MOJOSHADER_glAvailableProfiles(MOJOSHADER_glGetProcAddress lookup, void *d,

                                    const char **profs, const int size);

 /*

  * Determine the best profile to use for the current system.

  *

  * You can only call this AFTER you have successfully built your GL context

  *  and made it current. This function will lookup the GL functions it needs

  *  through the callback you supply via (lookup) and (d). The lookup function

  *  is neither stored nor used by MojoShader after this function returns, nor

  *  are the functions it might look up.

  *

  * Returns the name of the "best" profile on success, NULL if none of the

  *  available profiles will work on this system. "Best" is a relative term,

  *  but it generally means the best trade off between feature set and

  *  performance. The selection algorithm may be arbitrary and complex.

  *

  * The returned value is an internal static string, and should not be free()'d

  *  by the caller. If you get a NULL, calling MOJOSHADER_glGetError() might

  *  shed some light on why.

  *

  * This call is NOT thread safe! As most OpenGL implementations are not thread

  *  safe, you should probably only call this from the same thread that created

  *  the GL context.

  */

 const char *MOJOSHADER_glBestProfile(MOJOSHADER_glGetProcAddress lookup, void *d);

 /*

  * Prepare MojoShader to manage OpenGL shaders.

  *

  * You do not need to call this if all you want is MOJOSHADER_parse().

  *

  * You must call this once AFTER you have successfully built your GL context

  *  and made it current. This function will lookup the GL functions it needs

  *  through the callback you supply via (lookup) and (lookup_d), after which

  *  it may call them at any time up until you call

  *  MOJOSHADER_glDestroyContext(). The lookup function is neither stored nor

  *  used by MojoShader after this function returns.

  *

  * (profile) is an OpenGL-specific MojoShader profile, which decides how

  *  Direct3D bytecode shaders get turned into OpenGL programs, and how they

  *  are fed to the GL.

  *

  * (lookup) is a callback that is used to load GL entry points. This callback

  *  has to look up base GL functions and extension entry points. The pointer

  *  you supply in (lookup_d) is passed as-is to the callback.

  *

  * As MojoShader requires some memory to be allocated, you may provide a

  *  custom allocator to this function, which will be used to allocate/free

  *  memory. They function just like malloc() and free(). We do not use

  *  realloc(). If you don't care, pass NULL in for the allocator functions.

  *  If your allocator needs instance-specific data, you may supply it with the

  *  (malloc_d) parameter. This pointer is passed as-is to your (m) and (f)

  *  functions.

  *

  * Returns a new context on success, NULL on error. If you get a new context,

  *  you need to make it current before using it with

  *  MOJOSHADER_glMakeContextCurrent().

  *

  * This call is NOT thread safe! It must return success before you may call

  *  any other MOJOSHADER_gl* function. Also, as most OpenGL implementations

  *  are not thread safe, you should probably only call this from the same

  *  thread that created the GL context.

  */

 MOJOSHADER_glContext *MOJOSHADER_glCreateContext(const char *profile,

                                         MOJOSHADER_glGetProcAddress lookup,

                                         void *lookup_d,

                                         MOJOSHADER_malloc m, MOJOSHADER_free f,

                                         void *malloc_d);

 /*

  * You must call this before using the context that you got from

  *  MOJOSHADER_glCreateContext(), and must use it when you switch to a new GL

  *  context.

  *

  * You can only have one MOJOSHADER_glContext per actual GL context, or

  *  undefined behaviour will result.

  *

  * It is legal to call this with a NULL pointer to make no context current,

  *  but you need a valid context to be current to use most of MojoShader.

  */

 void MOJOSHADER_glMakeContextCurrent(MOJOSHADER_glContext *ctx);

 /*

  * Get any error state we might have picked up. MojoShader will NOT call

  *  glGetError() internally, but there are other errors we can pick up,

  *  such as failed shader compilation, etc.

  *

  * Returns a human-readable string. This string is for debugging purposes, and

  *  not guaranteed to be localized, coherent, or user-friendly in any way.

  *  It's for programmers!

  *

  * The latest error may remain between calls. New errors replace any existing

  *  error. Don't check this string for a sign that an error happened, check

  *  return codes instead and use this for explanation when debugging.

  *

  * Do not free the returned string: it's a pointer to a static internal

  *  buffer. Do not keep the pointer around, either, as it's likely to become

  *  invalid as soon as you call into MojoShader again.

  *

  * This call is NOT thread safe! As most OpenGL implementations are not thread

  *  safe, you should probably only call this from the same thread that created

  *  the GL context.

  *

  * This call does NOT require a valid MOJOSHADER_glContext to have been made

  *  current. The error buffer is shared between contexts, so you can get

  *  error results from a failed MOJOSHADER_glCreateContext().

  */

 const char *MOJOSHADER_glGetError(void);

 /*

  * Get the maximum uniforms a shader can support for the current GL context,

  *  MojoShader profile, and shader type. You can use this to make decisions

  *  about what shaders you want to use (for example, a less complicated

  *  shader may be swapped in for lower-end systems).

  *

  * Returns the number, or -1 on error.

  *

  * This call is NOT thread safe! As most OpenGL implementations are not thread

  *  safe, you should probably only call this from the same thread that created

  *  the GL context.

  *

  * This call requires a valid MOJOSHADER_glContext to have been made current,

  *  or it will crash your program. See MOJOSHADER_glMakeContextCurrent().

  */

 int MOJOSHADER_glMaxUniforms(MOJOSHADER_shaderType shader_type);

 /*

  * Compile a buffer of Direct3D shader bytecode into an OpenGL shader.

  *  You still need to link the shader before you may render with it.

  *

  *   (tokenbuf) is a buffer of Direct3D shader bytecode.

  *   (bufsize) is the size, in bytes, of the bytecode buffer.

  *   (swiz) and (swizcount) are passed to MOJOSHADER_parse() unmolested.

  *

  * Returns NULL on error, or a shader handle on success.

  *

  * This call is NOT thread safe! As most OpenGL implementations are not thread

  *  safe, you should probably only call this from the same thread that created

  *  the GL context.

  *

  * This call requires a valid MOJOSHADER_glContext to have been made current,

  *  or it will crash your program. See MOJOSHADER_glMakeContextCurrent().

  *

  * Compiled shaders from this function may not be shared between contexts.

  */

 MOJOSHADER_glShader *MOJOSHADER_glCompileShader(const unsigned char *tokenbuf,

                                                 const unsigned int bufsize,

                                                 const MOJOSHADER_swizzle *swiz,