/
mojoshader.c
4411 lines (3707 loc) · 137 KB
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/**
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* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
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*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
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// !!! FIXME: I keep changing coding styles for symbols and typedefs.
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// !!! FIXME: do DEF* opcodes have to come before instructions?
// !!! FIXME: my reading of the msdn spec suggests no, but it sounds like
// !!! FIXME: something they'd require. DCL_* _does_ have to be first.
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// Shader bytecode format is described at MSDN:
// http://msdn2.microsoft.com/en-us/library/ms800307.aspx
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <assert.h>
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#include "mojoshader.h"
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// This is the highest shader version we currently support.
#define MAX_SHADER_MAJOR 3
#define MAX_SHADER_MINOR 0
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// If SUPPORT_PROFILE_* isn't defined, we assume an implicit desire to support.
// You get all the profiles unless you go out of your way to disable them.
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#ifndef SUPPORT_PROFILE_D3D
#define SUPPORT_PROFILE_D3D 1
#endif
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#ifndef SUPPORT_PROFILE_PASSTHROUGH
#define SUPPORT_PROFILE_PASSTHROUGH 1
#endif
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#ifndef SUPPORT_PROFILE_GLSL
#define SUPPORT_PROFILE_GLSL 1
#endif
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// Get basic wankery out of the way here...
typedef unsigned int uint; // this is a printf() helper. don't use for code.
typedef uint8_t uint8;
typedef uint32_t uint32;
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typedef int32_t int32;
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#ifdef __GNUC__
#define ISPRINTF(x,y) __attribute__((format (printf, x, y)))
#else
#define ISPRINTF(x,y)
#endif
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#define STATICARRAYLEN(x) ( (sizeof ((x))) / (sizeof ((x)[0])) )
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#ifdef _WINDOWS // !!! FIXME: bleh
const char *endline_str = "\r\n";
#else
const char *endline_str = "\n";
#endif
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// we need to reference this by explicit value occasionally.
#define OPCODE_RET 28
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// Byteswap magic...
#if ((defined __GNUC__) && (defined __POWERPC__))
static inline uint32 SWAP32(uint32 x)
{
__asm__ __volatile__("lwbrx %0,0,%1" : "=r" (x) : "r" (&x));
return x;
} // SWAP32
#elif defined(__POWERPC__)
static inline uint32 SWAP32(uint32 x)
{
return ( (((x) >> 24) & 0x000000FF) | (((x) >> 8) & 0x0000FF00) |
(((x) << 8) & 0x00FF0000) | (((x) << 24) & 0xFF000000) );
} // SWAP32
#else
# define SWAP32(x) (x)
#endif
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typedef enum
{
REG_TYPE_TEMP = 0,
REG_TYPE_INPUT = 1,
REG_TYPE_CONST = 2,
REG_TYPE_ADDRESS = 3,
REG_TYPE_TEXTURE = 3, // ALSO 3!
REG_TYPE_RASTOUT = 4,
REG_TYPE_ATTROUT = 5,
REG_TYPE_TEXCRDOUT = 6,
REG_TYPE_OUTPUT = 6, // ALSO 6!
REG_TYPE_CONSTINT = 7,
REG_TYPE_COLOROUT = 8,
REG_TYPE_DEPTHOUT = 9,
REG_TYPE_SAMPLER = 10,
REG_TYPE_CONST2 = 11,
REG_TYPE_CONST3 = 12,
REG_TYPE_CONST4 = 13,
REG_TYPE_CONSTBOOL = 14,
REG_TYPE_LOOP = 15,
REG_TYPE_TEMPFLOAT16 = 16,
REG_TYPE_MISCTYPE = 17,
REG_TYPE_LABEL = 18,
REG_TYPE_PREDICATE = 19,
REG_TYPE_MAX = 19
} RegisterType;
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// predeclare.
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typedef struct Context Context;
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// one emit function for each opcode in each profile.
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typedef void (*emit_function)(Context *ctx);
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// one emit function for comments in each profile.
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typedef void (*emit_comment)(Context *ctx, const char *str);
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// one emit function for starting output in each profile.
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typedef void (*emit_start)(Context *ctx);
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// one emit function for ending output in each profile.
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typedef void (*emit_end)(Context *ctx);
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// one emit function for finalizing output in each profile.
typedef void (*emit_finalize)(Context *ctx);
// one emit function for global definitions in each profile.
typedef void (*emit_global)(Context *ctx, RegisterType regtype, int regnum);
// one emit function for uniforms in each profile.
typedef void (*emit_uniform)(Context *ctx, RegisterType regtype, int regnum);
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// one emit function for attributes in each profile.
typedef void (*emit_attribute)(Context *ctx, RegisterType regtype, int regnum,
MOJOSHADER_usage usage, int index, int wmask);
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// one args function for each possible sequence of opcode arguments.
typedef int (*args_function)(Context *ctx);
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// one state function for each opcode where we have state machine updates.
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typedef void (*state_function)(Context *ctx);
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typedef struct
{
const char *name;
emit_start start_emitter;
emit_end end_emitter;
emit_comment comment_emitter;
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emit_global global_emitter;
emit_uniform uniform_emitter;
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emit_attribute attribute_emitter;
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emit_finalize finalize_emitter;
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} Profile;
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typedef enum
{
RASTOUT_TYPE_POSITION = 0,
RASTOUT_TYPE_FOG = 1,
RASTOUT_TYPE_POINT_SIZE = 2,
RASTOUT_TYPE_MAX = 2
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} RastOutType;
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typedef enum
{
MISCTYPE_TYPE_POSITION = 0,
MISCTYPE_TYPE_FACE = 1,
MISCTYPE_TYPE_MAX = 1
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} MiscTypeType;
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typedef enum
{
TEXTURE_TYPE_2D = 2,
TEXTURE_TYPE_CUBE = 3,
TEXTURE_TYPE_VOLUME = 4,
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} TextureType;
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// A simple linked list of strings, so we can build the final output without
// realloc()ing for each new line, and easily insert lines into the middle
// of the output without much trouble.
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typedef struct OutputListNode
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{
char *str;
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struct OutputListNode *next;
} OutputListNode;
typedef struct OutputList
{
OutputListNode head;
OutputListNode *tail;
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} OutputList;
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typedef struct RegisterList
{
RegisterType regtype;
int regnum;
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MOJOSHADER_usage usage;
int index;
int writemask;
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struct RegisterList *next;
} RegisterList;
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// result modifiers.
#define MOD_SATURATE 0x01
#define MOD_PP 0x02
#define MOD_CENTROID 0x04
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// source modifiers.
typedef enum
{
SRCMOD_NONE,
SRCMOD_NEGATE,
SRCMOD_BIAS,
SRCMOD_BIASNEGATE,
SRCMOD_SIGN,
SRCMOD_SIGNNEGATE,
SRCMOD_COMPLEMENT,
SRCMOD_X2,
SRCMOD_X2NEGATE,
SRCMOD_DZ,
SRCMOD_DW,
SRCMOD_ABS,
SRCMOD_ABSNEGATE,
SRCMOD_NOT,
SRCMOD_TOTAL
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} SourceMod;
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typedef struct
{
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const uint32 *token; // this is the unmolested token in the stream.
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int regnum;
int relative;
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int writemask; // xyzw or rgba (all four, not split out).
int writemask0; // x or red
int writemask1; // y or green
int writemask2; // z or blue
int writemask3; // w or alpha
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int result_mod;
int result_shift;
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RegisterType regtype;
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} DestArgInfo;
typedef struct
{
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const uint32 *token; // this is the unmolested token in the stream.
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int regnum;
int relative;
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int swizzle; // xyzw (all four, not split out).
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int swizzle_x;
int swizzle_y;
int swizzle_z;
int swizzle_w;
int src_mod;
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RegisterType regtype;
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} SourceArgInfo;
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typedef enum
{
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// Specific to GLSL profile...
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CTX_FLAGS_GLSL_LIT_OPCODE = (1 << 0),
CTX_FLAGS_GLSL_DST_OPCODE = (1 << 1),
CTX_FLAGS_GLSL_LRP_OPCODE = (1 << 2),
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CTX_FLAGS_MASK = 0xFFFFFFFF
} ContextFlags;
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#define SCRATCH_BUFFER_SIZE 256
#define SCRATCH_BUFFERS 10
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// !!! FIXME: the scratch buffers make Context pretty big.
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// !!! FIXME: might be worth having one set of static scratch buffers that
// !!! FIXME: are mutex protected?
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// Context...this is state that changes as we parse through a shader...
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struct Context
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{
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MOJOSHADER_malloc malloc;
MOJOSHADER_free free;
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void *malloc_data;
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const uint32 *tokens;
uint32 tokencount;
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OutputList *output;
OutputList globals;
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OutputList helpers;
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OutputList subroutines;
OutputList mainline;
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OutputList ignore;
OutputList *output_stack[2];
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uint8 *output_bytes; // can be used instead of the OutputLists.
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int indent_stack[2];
int output_stack_len;
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int output_len; // total strlen; prevents walking the lists just to malloc.
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int indent;
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const char *endline;
int endline_len;
const char *failstr;
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char scratch[SCRATCH_BUFFERS][SCRATCH_BUFFER_SIZE];
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int scratchidx; // current scratch buffer.
int profileid;
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const Profile *profile;
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MOJOSHADER_shaderType shader_type;
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uint8 major_ver;
uint8 minor_ver;
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DestArgInfo dest_args[1];
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SourceArgInfo source_args[5];
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uint32 dwords[4];
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int instruction_count;
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uint32 instruction_controls;
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uint32 previous_opcode;
ContextFlags flags;
int loops;
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int reps;
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int cmps;
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RegisterList used_registers;
RegisterList defined_registers;
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int uniform_count;
RegisterList uniforms;
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int attribute_count;
RegisterList attributes;
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};
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// Convenience functions for allocators...
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static inline void *Malloc(const Context *ctx, const int len)
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{
return ctx->malloc(len, ctx->malloc_data);
} // Malloc
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static inline void Free(const Context *ctx, void *ptr)
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{
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if (ptr != NULL) // check for NULL in case of dumb free() impl.
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ctx->free(ptr, ctx->malloc_data);
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} // Free
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// jump between output sections in the context...
static inline void push_output(Context *ctx, OutputList *section)
{
assert(ctx->output_stack_len < STATICARRAYLEN(ctx->output_stack));
ctx->output_stack[ctx->output_stack_len] = ctx->output;
ctx->indent_stack[ctx->output_stack_len] = ctx->indent;
ctx->output_stack_len++;
ctx->output = section;
ctx->indent = 0;
} // push_output
static inline void pop_output(Context *ctx)
{
assert(ctx->output_stack_len > 0);
ctx->output_stack_len--;
ctx->output = ctx->output_stack[ctx->output_stack_len];
ctx->indent = ctx->indent_stack[ctx->output_stack_len];
} // pop_output
// Shader model version magic...
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static inline uint32 ver_ui32(const uint8 major, const uint8 minor)
{
return ( (((uint32) major) << 16) | (((minor) == 0xFF) ? 0 : (minor)) );
} // version_ui32
static int shader_version_supported(uint8 maj, uint8 min)
{
return (ver_ui32(maj,min) <= ver_ui32(MAX_SHADER_MAJOR, MAX_SHADER_MINOR));
} // shader_version_supported
static int shader_version_atleast(const Context *ctx, uint8 maj, uint8 min)
{
return (ver_ui32(ctx->major_ver, ctx->minor_ver) >= ver_ui32(maj, min));
} // shader_version_atleast
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// Bit arrays (for storing large arrays of booleans...
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static inline char *get_scratch_buffer(Context *ctx)
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{
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ctx->scratchidx = (ctx->scratchidx + 1) % SCRATCH_BUFFERS;
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return ctx->scratch[ctx->scratchidx];
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} // get_scratch_buffer
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// Special-case return values from the parsing pipeline...
#define FAIL (-1)
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#define NOFAIL (-2)
#define END_OF_STREAM (-3)
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static inline int isfail(const Context *ctx)
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{
return (ctx->failstr != NULL);
} // isfail
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static MOJOSHADER_parseData out_of_mem_data = {
"Out of memory", 0, 0, 0, MOJOSHADER_TYPE_UNKNOWN, 0, 0, 0, 0
};
static const char *out_of_mem_str = "Out of memory";
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static inline int out_of_memory(Context *ctx)
{
if (ctx->failstr == NULL)
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ctx->failstr = out_of_mem_str; // fail() would call malloc().
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return FAIL;
} // out_of_memory
static int failf(Context *ctx, const char *fmt, ...) ISPRINTF(2,3);
static int failf(Context *ctx, const char *fmt, ...)
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{
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if (ctx->failstr == NULL) // don't change existing error.
{
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char *scratch = get_scratch_buffer(ctx);
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va_list ap;
va_start(ap, fmt);
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const int len = vsnprintf(scratch,SCRATCH_BUFFER_SIZE,fmt,ap);
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va_end(ap);
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char *failstr = (char *) Malloc(ctx, len + 1);
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if (failstr == NULL)
out_of_memory(ctx);
else
{
// see comments about scratch buffer overflow in output_line().
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if (len < SCRATCH_BUFFER_SIZE)
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strcpy(failstr, scratch); // copy it over.
else
{
va_start(ap, fmt);
vsnprintf(failstr, len + 1, fmt, ap); // rebuild it.
va_end(ap);
} // else
ctx->failstr = failstr;
} // else
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} // if
return FAIL;
} // failf
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static inline int fail(Context *ctx, const char *reason)
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{
return failf(ctx, "%s", reason);
} // fail
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static int output_line(Context *ctx, const char *fmt, ...) ISPRINTF(2,3);
static int output_line(Context *ctx, const char *fmt, ...)
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{
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OutputListNode *item = NULL;
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if (isfail(ctx))
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return FAIL; // we failed previously, don't go on...
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char *scratch = get_scratch_buffer(ctx);
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const int indent = ctx->indent;
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if (indent > 0)
memset(scratch, '\t', indent);
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va_list ap;
va_start(ap, fmt);
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const int len = vsnprintf(scratch+indent, SCRATCH_BUFFER_SIZE-indent, fmt, ap) + indent;
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va_end(ap);
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item = (OutputListNode *) Malloc(ctx, sizeof (OutputListNode));
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if (item == NULL)
return out_of_memory(ctx);
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item->str = (char *) Malloc(ctx, len + 1);
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if (item->str == NULL)
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{
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Free(ctx, item);
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return out_of_memory(ctx);
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} // if
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// If we overflowed our scratch buffer, that's okay. We were going to
// allocate anyhow...the scratch buffer just lets us avoid a second
// run of vsnprintf().
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if (len < SCRATCH_BUFFER_SIZE)
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strcpy(item->str, scratch); // copy it over.
else
{
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if (indent > 0)
memset(item->str, '\t', indent);
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va_start(ap, fmt);
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vsnprintf(item->str+indent, len + 1, fmt, ap); // rebuild it.
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va_end(ap);
} // else
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item->next = NULL;
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ctx->output->tail->next = item;
ctx->output->tail = item;
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ctx->output_len += len + ctx->endline_len;
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return 0;
} // output_line
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// this is just to stop gcc whining.
static inline int output_blank_line(Context *ctx)
{
return output_line(ctx, "%s", "");
} // output_blank_line
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// !!! FIXME: this is sort of nasty.
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static void floatstr(Context *ctx, char *buf, size_t bufsize, float f,
int leavedecimal)
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{
const size_t len = snprintf(buf, bufsize, "%f", f);
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if ((len+2) >= bufsize)
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fail(ctx, "BUG: internal buffer is too small");
else
{
char *end = buf + len;
char *ptr = strchr(buf, '.');
if (ptr == NULL)
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{
if (leavedecimal)
strcat(buf, ".0");
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return; // done.
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} // if
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while (--end != ptr)
{
if (*end != '0')
{
end++;
break;
} // if
} // while
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if ((leavedecimal) && (end == ptr))
end += 2;
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*end = '\0'; // chop extra '0' or all decimal places off.
} // else
} // floatstr
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// Deal with register lists... !!! FIXME: I sort of hate this.
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static void free_reglist(MOJOSHADER_free f, void *d, RegisterList *item)
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{
while (item != NULL)
{
RegisterList *next = item->next;
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f(item, d);
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item = next;
} // while
} // free_reglist
static inline uint32 reg_to_ui32(const RegisterType regtype, const int regnum)
{
return ( ((uint32) regtype) | (((uint32) regnum) << 16) );
} // reg_to_uint32
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static RegisterList *reglist_insert(Context *ctx, RegisterList *prev,
const RegisterType regtype,
const int regnum)
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{
const uint32 newval = reg_to_ui32(regtype, regnum);
RegisterList *item = prev->next;
while (item != NULL)
{
const uint32 val = reg_to_ui32(item->regtype, item->regnum);
if (newval == val)
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return item; // already set, so we're done.
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else if (newval < val) // insert it here.
break;
else // if (newval > val)
{
// keep going, we're not to the insertion point yet.
prev = item;
item = item->next;
} // else
} // while
// we need to insert an entry after (prev).
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item = (RegisterList *) Malloc(ctx, sizeof (RegisterList));
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if (item == NULL)
out_of_memory(ctx);
else
{
item->regtype = regtype;
item->regnum = regnum;
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item->usage = 0;
item->index = 0;
item->writemask = 0;
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item->next = prev->next;
prev->next = item;
} // else
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return item;
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} // reglist_insert
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static RegisterList *reglist_find(RegisterList *prev, const RegisterType rtype,
const int regnum)
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{
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const uint32 newval = reg_to_ui32(rtype, regnum);
RegisterList *item = prev->next;
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while (item != NULL)
{
const uint32 val = reg_to_ui32(item->regtype, item->regnum);
if (newval == val)
return item; // here it is.
else if (newval < val) // should have been here if it existed.
return NULL;
else // if (newval > val)
{
// keep going, we're not to the insertion point yet.
prev = item;
item = item->next;
} // else
} // while
return NULL; // wasn't in the list.
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} // reglist_find
static inline const RegisterList *reglist_exists(RegisterList *prev,
const RegisterType regtype,
const int regnum)
{
return (reglist_find(prev, regtype, regnum));
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} // reglist_exists
static inline void set_used_register(Context *ctx, const RegisterType regtype,
const int regnum)
{
reglist_insert(ctx, &ctx->used_registers, regtype, regnum);
} // set_used_register
static inline int get_used_register(Context *ctx, const RegisterType regtype,
const int regnum)
{
return (reglist_exists(&ctx->used_registers, regtype, regnum) != NULL);
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} // get_used_register
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static inline void set_defined_register(Context *ctx, const RegisterType rtype,
const int regnum)
{
reglist_insert(ctx, &ctx->defined_registers, rtype, regnum);
} // set_defined_register
static inline int get_defined_register(Context *ctx, const RegisterType rtype,
const int regnum)
{
return (reglist_exists(&ctx->defined_registers, rtype, regnum) != NULL);
} // get_defined_register
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static void add_attribute_register(Context *ctx, const RegisterType rtype,
const int regnum, const MOJOSHADER_usage usage,
const int index, const int writemask)
{
RegisterList *item = reglist_insert(ctx, &ctx->attributes, rtype, regnum);
item->usage = usage;
item->index = index;
item->writemask = writemask;
} // add_attribute_register
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static inline int replicate_swizzle(const int swizzle)
{
return ( (((swizzle >> 0) & 0x3) == ((swizzle >> 2) & 0x3)) &&
(((swizzle >> 2) & 0x3) == ((swizzle >> 4) & 0x3)) &&
(((swizzle >> 4) & 0x3) == ((swizzle >> 6) & 0x3)) );
} // replicate_swizzle
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698
// D3D stuff that's used in more than just the d3d profile...
static const char *usagestrs[] = {
"_position", "_blendweight", "_blendindices", "_normal", "_psize",
"_texcoord", "_tangent", "_binormal", "_tessfactor", "_positiont",
"_color", "_fog", "_depth", "_sample"
};
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static const char *get_D3D_register_string(Context *ctx,
701
RegisterType regtype,
702
703
int regnum, char *regnum_str,
size_t regnum_size)
704
{
705
const char *retval = NULL;
706
int has_number = 1;
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708
switch (regtype)
709
{
710
case REG_TYPE_TEMP:
711
retval = "r";
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713
break;
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case REG_TYPE_INPUT:
715
retval = "v";
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717
break;
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case REG_TYPE_CONST:
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retval = "c";
break;
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case REG_TYPE_CONST2:
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retval = "c";
regnum += 2048;
break;
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case REG_TYPE_CONST3:
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retval = "c";
regnum += 4096;
break;
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case REG_TYPE_CONST4:
733
retval = "c";
734
regnum += 6144;
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736
break;
737
case REG_TYPE_ADDRESS: // (or REG_TYPE_TEXTURE, same value.)
738
retval = (ctx->shader_type == MOJOSHADER_TYPE_VERTEX) ? "a" : "t";
739
740
break;
741
case REG_TYPE_RASTOUT:
742
switch ((RastOutType) regnum)
743
{
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745
746
case RASTOUT_TYPE_POSITION: retval = "oPos"; break;
case RASTOUT_TYPE_FOG: retval = "oFog"; break;
case RASTOUT_TYPE_POINT_SIZE: retval = "oPts"; break;
747
} // switch
748
has_number = 0;
749
750
break;
751
case REG_TYPE_ATTROUT:
752
retval = "oD";
753
754
break;
755
case REG_TYPE_OUTPUT: // (or REG_TYPE_TEXCRDOUT, same value.)
756
if ((ctx->shader_type==MOJOSHADER_TYPE_VERTEX) && (ctx->major_ver>=3))
757
retval = "o";
758
else
759
retval = "oT";
760
761
break;
762
case REG_TYPE_CONSTINT:
763
retval = "i";
764
765
break;
766
case REG_TYPE_COLOROUT:
767
retval = "oC";
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769
break;
770
case REG_TYPE_DEPTHOUT:
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retval = "oDepth";
772
has_number = 0;
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774
break;
775
case REG_TYPE_SAMPLER:
776
retval = "s";
777
778
break;
779
case REG_TYPE_CONSTBOOL:
780
retval = "b";
781
782
break;
783
case REG_TYPE_LOOP:
784
retval = "aL";
785
has_number = 0;
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787
788
break;
// !!! FIXME: don't know what the asm string is for this..
789
case REG_TYPE_TEMPFLOAT16:
790
fail(ctx, "don't know the ASM for tempfloat16 register");
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792
793
retval = "???";
has_number = 0;
break;
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795
case REG_TYPE_MISCTYPE:
796
switch ((MiscTypeType) regnum)
797
{
798
799
case MISCTYPE_TYPE_POSITION: retval = "vPos"; break;
case MISCTYPE_TYPE_FACE: retval = "vFace"; break;
800
} // switch
801
has_number = 0;
802
803
break;
804
case REG_TYPE_LABEL:
805
retval = "l";
806
807
break;
808
case REG_TYPE_PREDICATE:
809
retval = "p";
810
811
812
break;
} // switch
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814
815
816
817
if (has_number)
snprintf(regnum_str, regnum_size, "%u", (uint) regnum);
else
regnum_str[0] = '\0';
818
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820
821
return retval;
} // get_D3D_register_string
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830
831
#define AT_LEAST_ONE_PROFILE 0
#if !SUPPORT_PROFILE_D3D
#define PROFILE_EMITTER_D3D(op)
#else
#undef AT_LEAST_ONE_PROFILE
#define AT_LEAST_ONE_PROFILE 1
#define PROFILE_EMITTER_D3D(op) emit_D3D_##op,
832
static const char *make_D3D_destarg_string(Context *ctx, const int idx)
833
834
835
836
{
if (idx >= STATICARRAYLEN(ctx->dest_args))
{
fail(ctx, "Too many destination args");
837
return "";
838
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840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
} // if
const DestArgInfo *arg = &ctx->dest_args[idx];
const char *result_shift_str = "";
switch (arg->result_shift)
{
case 0x1: result_shift_str = "_x2"; break;
case 0x2: result_shift_str = "_x4"; break;
case 0x3: result_shift_str = "_x8"; break;
case 0xD: result_shift_str = "_d8"; break;
case 0xE: result_shift_str = "_d4"; break;
case 0xF: result_shift_str = "_d2"; break;
} // switch
const char *sat_str = (arg->result_mod & MOD_SATURATE) ? "_sat" : "";
const char *pp_str = (arg->result_mod & MOD_PP) ? "_pp" : "";
const char *cent_str = (arg->result_mod & MOD_CENTROID) ? "_centroid" : "";
char regnum_str[16];
858
859
860
const char *regtype_str = get_D3D_register_string(ctx, arg->regtype,
arg->regnum, regnum_str,
sizeof (regnum_str));
861
862
863
if (regtype_str == NULL)
{
fail(ctx, "Unknown destination register type.");
864
return "";
865
866
} // if
867
868
869
870
871
872
873
874
875
876
877
878
char writemask_str[6];
int i = 0;
if (arg->writemask != 0xF) // 0xF == 1111. No explicit mask.
{
writemask_str[i++] = '.';
if (arg->writemask0) writemask_str[i++] = 'x';
if (arg->writemask1) writemask_str[i++] = 'y';
if (arg->writemask2) writemask_str[i++] = 'z';
if (arg->writemask3) writemask_str[i++] = 'w';
} // if
writemask_str[i] = '\0';
assert(i < sizeof (writemask_str));
879
880
// may turn out something like "_x2_sat_pp_centroid r0.xyzw" ...
881
char *retval = get_scratch_buffer(ctx);
882
snprintf(retval, SCRATCH_BUFFER_SIZE, "%s%s%s%s %s%s%s",
883
result_shift_str, sat_str, pp_str, cent_str,
884
regtype_str, regnum_str, writemask_str);
885
// !!! FIXME: make sure the scratch buffer was large enough.
886
return retval;
887
} // make_D3D_destarg_string
888
889
890
static const char *make_D3D_sourcearg_string(Context *ctx, const int idx)
891
{
892
893
894
if (idx >= STATICARRAYLEN(ctx->source_args))
{
fail(ctx, "Too many source args");
895
return "";
896
} // if
897
898
899
900
901
const SourceArgInfo *arg = &ctx->source_args[idx];
const char *premod_str = "";
const char *postmod_str = "";
902
switch ((SourceMod) arg->src_mod)
903
904
905
906
907
908
909
910
911
912
913
{
case SRCMOD_NEGATE:
premod_str = "-";
break;
case SRCMOD_BIASNEGATE:
premod_str = "-";
// fall through.
case SRCMOD_BIAS:
postmod_str = "_bias";
break;
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
case SRCMOD_SIGNNEGATE:
premod_str = "-";
// fall through.
case SRCMOD_SIGN:
postmod_str = "_bx2";
break;
case SRCMOD_COMPLEMENT:
premod_str = "1-";
break;
case SRCMOD_X2NEGATE:
premod_str = "-";
// fall through.
case SRCMOD_X2:
postmod_str = "_x2";
break;
case SRCMOD_DZ:
postmod_str = "_dz";
break;
case SRCMOD_DW:
postmod_str = "_dw";
break;
case SRCMOD_ABSNEGATE:
premod_str = "-";
// fall through.
case SRCMOD_ABS:
postmod_str = "_abs";
break;
case SRCMOD_NOT:
premod_str = "!";
break;
951
952
953
954
case SRCMOD_NONE:
case SRCMOD_TOTAL:
break; // stop compiler whining.
955
956
957
958
} // switch
char regnum_str[16];
959
960
961
const char *regtype_str = get_D3D_register_string(ctx, arg->regtype,
arg->regnum, regnum_str,
sizeof (regnum_str));
962
963
964
965
if (regtype_str == NULL)
{
fail(ctx, "Unknown source register type.");
966
return "";
967
968
969
970
} // if
char swizzle_str[6];
int i = 0;
971
if (arg->swizzle != 0xE4) // 0xE4 == 11100100 ... 3 2 1 0. No swizzle.
972
973
974
{
static const char channel[] = { 'x', 'y', 'z', 'w' };
swizzle_str[i++] = '.';
975
976
977
978
979
980
981
982
swizzle_str[i++] = channel[arg->swizzle_x];
swizzle_str[i++] = channel[arg->swizzle_y];
swizzle_str[i++] = channel[arg->swizzle_z];
swizzle_str[i++] = channel[arg->swizzle_w];
// .xyzz is the same as .xyz, .z is the same as .zzzz, etc.
while (swizzle_str[i-1] == swizzle_str[i-2])
i--;
983
984
985
986
} // if
swizzle_str[i] = '\0';
assert(i < sizeof (swizzle_str));
987
char *retval = get_scratch_buffer(ctx);
988
989
snprintf(retval, SCRATCH_BUFFER_SIZE, "%s%s%s%s%s",
premod_str, regtype_str, regnum_str, postmod_str, swizzle_str);
990
// !!! FIXME: make sure the scratch buffer was large enough.
991
return retval;
992
} // make_D3D_sourcearg_string
993
994
995
static void emit_D3D_start(Context *ctx)
996
997
998
{
const uint major = (uint) ctx->major_ver;
const uint minor = (uint) ctx->minor_ver;
999
1000
const char *shadertype_str = NULL;
char minor_str[16];