#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <stdint.h>

#include <stdarg.h>

#include <assert.h>

#include "mojoshader.h"

#define GL_GLEXT_LEGACY 1

#include "gl.h"

#include "glext.h"

// Get basic wankery out of the way here...

#define STATICARRAYLEN(x) ( (sizeof ((x))) / (sizeof ((x)[0])) )

typedef unsigned int uint; // this is a printf() helper. don't use for code.

typedef uint8_t uint8;

typedef uint32_t uint32;

typedef int32_t int32;

struct MOJOSHADER_glShader

{

const MOJOSHADER_parseData *parseData;

uint32 refcount;

};

typedef struct

{

} UniformMap;

typedef struct

{

} AttributeMap;

struct MOJOSHADER_glProgram

{

MOJOSHADER_glShader *vertex;

MOJOSHADER_glShader *fragment;

uint32 refcount;

};

// Allocators...

static MOJOSHADER_malloc malloc_fn = NULL;

static MOJOSHADER_free free_fn = NULL;

static void *malloc_data = NULL;

// The constant register files...

// Man, it kills me how much memory this takes...

static float vs_register_file_f[8192 * 4];

static int vs_register_file_i[2047 * 4];

static uint8 vs_register_file_b[2047];

static float ps_register_file_f[8192 * 4];

static int ps_register_file_i[2047 * 4];

static uint8 ps_register_file_b[2047];

// GL stuff...

static int opengl_major = 0;

static int opengl_minor = 0;

static const char *profile = NULL;

// Entry points...

typedef WINGDIAPI const GLubyte * (APIENTRYP PFNGLGETSTRINGPROC) (GLenum name);

typedef WINGDIAPI void (APIENTRYP PFNGLDISABLECLIENTSTATEPROC) (GLenum array);

typedef WINGDIAPI void (APIENTRYP PFNGLENABLECLIENTSTATEPROC) (GLenum array);

typedef WINGDIAPI void (APIENTRYP PFNGLVERTEXPOINTERPROC) (GLint size, GLenum type, GLsizei stride, const GLvoid *pointer);

static int have_base_opengl = 0;

static int have_GL_ARB_shader_objects = 0;

static int have_GL_ARB_vertex_shader = 0;

static int have_GL_ARB_fragment_shader = 0;

static int have_GL_ARB_shading_language_100 = 0;

static PFNGLGETSTRINGPROC pglGetString = NULL;

static PFNGLDELETEOBJECTARBPROC pglDeleteObject = NULL;

static PFNGLATTACHOBJECTARBPROC pglAttachObject = NULL;

static PFNGLCOMPILESHADERARBPROC pglCompileShader = NULL;

static PFNGLCREATEPROGRAMOBJECTARBPROC pglCreateProgramObject = NULL;

static PFNGLCREATESHADEROBJECTARBPROC pglCreateShaderObject = NULL;

static PFNGLDISABLECLIENTSTATEPROC pglDisableClientState = NULL;

static PFNGLDISABLEVERTEXATTRIBARRAYARBPROC pglDisableVertexAttribArray = NULL;

static PFNGLENABLECLIENTSTATEPROC pglEnableClientState = NULL;

static PFNGLENABLEVERTEXATTRIBARRAYARBPROC pglEnableVertexAttribArray = NULL;

static PFNGLGETATTRIBLOCATIONARBPROC pglGetAttribLocation = NULL;

static PFNGLGETINFOLOGARBPROC pglGetInfoLog = NULL;

static PFNGLGETOBJECTPARAMETERIVARBPROC pglGetObjectParameteriv = NULL;

static PFNGLGETUNIFORMLOCATIONARBPROC pglGetUniformLocation = NULL;

static PFNGLLINKPROGRAMARBPROC pglLinkProgram = NULL;

static PFNGLSHADERSOURCEARBPROC pglShaderSource = NULL;

static PFNGLUNIFORM1IARBPROC pglUniform1i = NULL;

static PFNGLUNIFORM4FVARBPROC pglUniform4fv = NULL;

static PFNGLUNIFORM4IVARBPROC pglUniform4iv = NULL;

static PFNGLUSEPROGRAMOBJECTARBPROC pglUseProgramObject = NULL;

static PFNGLVERTEXATTRIBPOINTERARBPROC pglVertexAttribPointer = NULL;

static PFNGLVERTEXPOINTERPROC pglVertexPointer = NULL;

// Error state...

static char error_buffer[1024] = { '\0' };

static void set_error(const char *str)

{

snprintf(error_buffer, sizeof (error_buffer), "%s", str);

} // set_error

// #define this to force app to supply an allocator, so there's no reference

// to the C runtime's malloc() and free()...

#if MOJOSHADER_FORCE_ALLOCATOR

#define internal_malloc NULL

#define internal_free NULL

#else

static void *internal_malloc(int bytes, void *d) { return malloc(bytes); }

static void internal_free(void *ptr, void *d) { free(ptr); }

#endif

static inline void *Malloc(const size_t len)

{

void *retval = malloc_fn(len, malloc_data);

if (retval == NULL)

set_error("out of memory");

return retval;

} // Malloc

static inline void Free(void *ptr)

{

if (ptr != NULL)

free_fn(ptr, malloc_data);

} // Free

const char *MOJOSHADER_glGetError(void)

{

return error_buffer;

} // MOJOSHADER_glGetError

static void *loadsym(void *(*lookup)(const char *fn), const char *fn, int *ext)

{

void *retval = NULL;

if (lookup != NULL)

{

retval = lookup(fn);

if (retval == NULL)

{

char arbfn[64];

snprintf(arbfn, sizeof (arbfn), "%sARB", fn);

retval = lookup(arbfn);

} // if

} // if

if (retval == NULL)

*ext = 0;

return retval;

} // loadsym

static void lookup_entry_points(void *(*lookup)(const char *fnname))

{

#define DO_LOOKUP(ext, typ, fn) p##fn = (typ) loadsym(lookup, #fn, &have_##ext)

DO_LOOKUP(base_opengl, PFNGLGETSTRINGPROC, glGetString);

DO_LOOKUP(base_opengl, PFNGLDISABLECLIENTSTATEPROC, glDisableClientState);

DO_LOOKUP(base_opengl, PFNGLENABLECLIENTSTATEPROC, glEnableClientState);

DO_LOOKUP(base_opengl, PFNGLVERTEXPOINTERPROC, glVertexPointer);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLDELETEOBJECTARBPROC, glDeleteObject);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLATTACHOBJECTARBPROC, glAttachObject);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLCOMPILESHADERARBPROC, glCompileShader);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLCREATEPROGRAMOBJECTARBPROC, glCreateProgramObject);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLCREATESHADEROBJECTARBPROC, glCreateShaderObject);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLGETINFOLOGARBPROC, glGetInfoLog);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLGETOBJECTPARAMETERIVARBPROC, glGetObjectParameteriv);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLGETUNIFORMLOCATIONARBPROC, glGetUniformLocation);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLLINKPROGRAMARBPROC, glLinkProgram);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLSHADERSOURCEARBPROC, glShaderSource);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLUNIFORM1IARBPROC, glUniform1i);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLUNIFORM4FVARBPROC, glUniform4fv);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLUNIFORM4IVARBPROC, glUniform4iv);

DO_LOOKUP(GL_ARB_shader_objects, PFNGLUSEPROGRAMOBJECTARBPROC, glUseProgramObject);

DO_LOOKUP(GL_ARB_vertex_shader, PFNGLDISABLEVERTEXATTRIBARRAYARBPROC, glDisableVertexAttribArray);

DO_LOOKUP(GL_ARB_vertex_shader, PFNGLENABLEVERTEXATTRIBARRAYARBPROC, glEnableVertexAttribArray);

DO_LOOKUP(GL_ARB_vertex_shader, PFNGLGETATTRIBLOCATIONARBPROC, glGetAttribLocation);

DO_LOOKUP(GL_ARB_vertex_shader, PFNGLVERTEXATTRIBPOINTERARBPROC, glVertexAttribPointer);

#undef DO_LOOKUP

} // lookup_entry_points

static int verify_extension(const char *ext, int have, const char *extlist,

int major, int minor)

{

if (have == 0)

return 0; // don't bother checking, we're missing an entry point.

// See if it's in the spec for this GL implementation's version.

if ( ((opengl_major << 16) | (opengl_minor & 0xFFFF)) >=

((major << 16) | (minor & 0xFFFF)) )

return 1;

// Not available in the GL version, check the extension list.

const char *ptr = strstr(extlist, ext);

if (ptr == NULL)

return 0;

const char endchar = ptr[strlen(ext)];

if ((endchar == '\0') || (endchar == ' '))

return 1; // extension is in the list.

return 0; // just not supported, fail.

} // verify_extension

static void parse_opengl_version(const char *verstr)

{

if (verstr == NULL)

opengl_major = opengl_minor = 0;

else

sscanf(verstr, "%d.%d", &opengl_major, &opengl_minor);

} // parse_opengl_version

static int check_extensions(void *(*lookup)(const char *fnname))

{

have_base_opengl = 1;

have_GL_ARB_shader_objects = 1;

have_GL_ARB_vertex_shader = 1;

have_GL_ARB_fragment_shader = 1;

have_GL_ARB_shading_language_100 = 1;

lookup_entry_points(lookup);

if (!have_base_opengl) // a function we should definitely have is MIA?

{

set_error("missing basic OpenGL entry points");

return 0;

} // if

parse_opengl_version((const char *) pglGetString(GL_VERSION));

const char *extlist = (const char *) pglGetString(GL_EXTENSIONS);

if (extlist == NULL)

extlist = ""; // just in case.

#define VERIFY_EXT(ext, major, minor) \

have_##ext = verify_extension(#ext, have_##ext, extlist, major, minor)

VERIFY_EXT(GL_ARB_shader_objects, 2, 0);

VERIFY_EXT(GL_ARB_vertex_shader, 2, 0);

VERIFY_EXT(GL_ARB_fragment_shader, 2, 0);

VERIFY_EXT(GL_ARB_shading_language_100, 2, 0);

#undef VERIFY_EXT

#define REQUIRE_GL_EXTENSION(x) \

if (!have_##x) { set_error("This profile requires " #x); return 0; }

if (strcmp(profile, MOJOSHADER_PROFILE_GLSL) == 0)

{

REQUIRE_GL_EXTENSION(GL_ARB_shader_objects);

REQUIRE_GL_EXTENSION(GL_ARB_vertex_shader);

REQUIRE_GL_EXTENSION(GL_ARB_fragment_shader);

REQUIRE_GL_EXTENSION(GL_ARB_shading_language_100);

} // if

else

{

set_error("unknown profile");

return 0;

} // else

#undef REQUIRE_GL_EXTENSION

return 1;

} // check_extensions

int MOJOSHADER_glInit(const char *_profile,

void *(*lookup)(const char *fnname),

MOJOSHADER_malloc m, MOJOSHADER_free f, void *d)

{

error_buffer[0] = '\0';

profile = MOJOSHADER_PROFILE_GLSL;

else

{

set_error("unknown profile");

if (!check_extensions(lookup))

goto init_fail;

malloc_fn = (m == NULL) ? internal_malloc : m;

free_fn = (f == NULL) ? internal_free : f;

malloc_data = d;

memset(vs_register_file_f, '\0', sizeof (vs_register_file_f));

memset(vs_register_file_i, '\0', sizeof (vs_register_file_i));

memset(vs_register_file_b, '\0', sizeof (vs_register_file_b));

memset(ps_register_file_f, '\0', sizeof (ps_register_file_f));

memset(ps_register_file_i, '\0', sizeof (ps_register_file_i));

memset(ps_register_file_b, '\0', sizeof (ps_register_file_b));

MOJOSHADER_glBindProgram(NULL);

return 1;

init_fail:

opengl_major = 0;

opengl_minor = 0;

profile = NULL;

malloc_fn = NULL;

free_fn = NULL;

malloc_data = NULL;

lookup_entry_points(NULL);

return 0;

} // MOJOSHADER_glInit

MOJOSHADER_glShader *MOJOSHADER_glCompileShader(const unsigned char *tokenbuf,

const unsigned int bufsize)

{

MOJOSHADER_glShader *retval = NULL;

const MOJOSHADER_parseData *pd = MOJOSHADER_parse(profile, tokenbuf,

bufsize, malloc_fn,

free_fn, malloc_data);

if (pd->error != NULL)

{

set_error(pd->error);

retval = (MOJOSHADER_glShader *) Malloc(sizeof (MOJOSHADER_glShader));

if (retval == NULL)

goto compile_shader_fail;

pglShaderSource(shader, 1, (const GLchar **) &pd->output, &shaderlen);

pglCompileShader(shader);

pglGetObjectParameteriv(shader, GL_OBJECT_COMPILE_STATUS_ARB, &ok);

if (!ok)

{

GLsizei len = 0;

} // if

retval->parseData = pd;

retval->handle = shader;

retval->refcount = 1;

return retval;

compile_shader_fail:

MOJOSHADER_freeParseData(pd);

Free(retval);

if (shader != 0)

} // MOJOSHADER_glCompileShader

static void shader_unref(MOJOSHADER_glShader *shader)

{

if (shader != NULL)

{

else

{

MOJOSHADER_freeParseData(shader->parseData);

Free(shader);

} // else

} // if

} // shader_unref

static void program_unref(MOJOSHADER_glProgram *program)

{

if (program != NULL)

{

const uint32 refcount = program->refcount;

if (refcount > 1)

program->refcount--;

else

{

shader_unref(program->vertex);

shader_unref(program->fragment);

Free(program);

} // else

} // if

} // program_unref

static void lookup_uniforms(MOJOSHADER_glProgram *program,

MOJOSHADER_glShader *shader)

{

int i;

const MOJOSHADER_parseData *pd = shader->parseData;

for (i = 0; i < pd->uniform_count; i++)

{

if (loc != -1) // maybe the Uniform was optimized out?

{

UniformMap *map = &program->uniforms[program->uniform_count];

program->uniform_count++;

} // if

} // for

} // lookup_uniforms

static void lookup_attributes(MOJOSHADER_glProgram *program)

{

int i;

const MOJOSHADER_parseData *pd = program->vertex->parseData;

for (i = 0; i < pd->attribute_count; i++)

{

if (loc != -1) // maybe the Attribute was optimized out?

{

AttributeMap *map = &program->attributes[program->attribute_count];

map->attribute = &a[i];

program->attribute_count++;

} // if

} // for

} // lookup_attributes

MOJOSHADER_glProgram *MOJOSHADER_glLinkProgram(MOJOSHADER_glShader *vshader,

MOJOSHADER_glShader *pshader)

{

if ((vshader == NULL) && (pshader == NULL))

return NULL;

if (vshader != NULL) pglAttachObject(program, vshader->handle);

if (pshader != NULL) pglAttachObject(program, pshader->handle);

GLint ok = 0;

if (!ok)

{

GLsizei len = 0;

goto link_program_fail;

} // if

retval = (MOJOSHADER_glProgram *) Malloc(sizeof (MOJOSHADER_glProgram));

if (retval == NULL)

goto link_program_fail;

memset(retval, '\0', sizeof (MOJOSHADER_glProgram));

int numregs = 0;

if (vshader != NULL) numregs += vshader->parseData->uniform_count;

if (pshader != NULL) numregs += pshader->parseData->uniform_count;

retval->uniforms = (UniformMap *) Malloc(sizeof (UniformMap) * numregs);

if (retval->uniforms == NULL)

goto link_program_fail;

retval->handle = program;

retval->vertex = vshader;

retval->fragment = pshader;

retval->refcount = 1;

if (vshader != NULL)

retval->attributes = (AttributeMap *) Malloc(sizeof (AttributeMap) *

vshader->parseData->attribute_count);

if (retval->attributes == NULL)

goto link_program_fail;

lookup_attributes(retval);

} // if

{

lookup_uniforms(retval, pshader);

return retval;

link_program_fail:

if (retval != NULL)

{

Free(retval->uniforms);

Free(retval->attributes);

Free(retval);

} // if

} // MOJOSHADER_glLinkProgram

void MOJOSHADER_glBindProgram(MOJOSHADER_glProgram *program)

{

if (program == bound_program)

return; // nothing to do.

// Disable any client-side arrays the current program could have used.

if (bound_program != NULL)

{

pglDisableClientState(GL_VERTEX_ARRAY);

for (i = 0; i < bound_program->attribute_count; i++)

{

const AttributeMap *map = &bound_program->attributes[i];

} // if

} // for

if (program != NULL)

{

handle = program->handle;

program->refcount++;

} // if

program_unref(bound_program);

bound_program = program;

} // MOJOSHADER_glBindProgram

static inline uint maxuint(const uint a, const uint b)

{

return ((a > b) ? a : b);

} // maxuint

const uint maxregs = STATICARRAYLEN(vs_register_file_f) / 4;

if (idx < maxregs)

{

memcpy(vs_register_file_f + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetVertexShaderUniformF

void MOJOSHADER_glSetVertexShaderUniformI(unsigned int idx, const int *data,

const uint maxregs = STATICARRAYLEN(vs_register_file_i) / 4;

if (idx < maxregs)

{

memcpy(vs_register_file_i + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetVertexShaderUniformI

void MOJOSHADER_glSetVertexShaderUniformB(unsigned int idx, const int *data,

unsigned int bcount)

{

const uint maxregs = STATICARRAYLEN(vs_register_file_f) / 4;

if (idx < maxregs)

{

uint8 *wptr = vs_register_file_b + idx;

uint8 *endptr = wptr + maxuint(maxregs - idx, bcount);

while (wptr != endptr)

*(wptr++) = *(data++) ? 1 : 0;

} // if

} // MOJOSHADER_glSetVertexShaderUniformB

void MOJOSHADER_glSetPixelShaderUniformF(unsigned int idx, const float *data,

const uint maxregs = STATICARRAYLEN(ps_register_file_f) / 4;

if (idx < maxregs)

{

memcpy(ps_register_file_f + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetPixelShaderUniformF

void MOJOSHADER_glSetPixelShaderUniformI(unsigned int idx, const int *data,

const uint maxregs = STATICARRAYLEN(ps_register_file_i) / 4;

if (idx < maxregs)

{

memcpy(ps_register_file_i + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetPixelShaderUniformI

void MOJOSHADER_glSetPixelShaderUniformB(unsigned int idx, const int *data,

const uint maxregs = STATICARRAYLEN(ps_register_file_f) / 4;

if (idx < maxregs)

{

uint8 *wptr = ps_register_file_b + idx;

uint8 *endptr = wptr + maxuint(maxregs - idx, bcount);

while (wptr != endptr)

*(wptr++) = *(data++) ? 1 : 0;

} // if

} // MOJOSHADER_glSetPixelShaderUniformB

static inline GLenum opengl_posattr_type(const MOJOSHADER_attributeType type)

{

// we don't ever use the glVertexPointer() stream, so we just need to

// make the data types reasonably match, so the GL doesn't overrun

// the buffer when dereferencing it.

switch (type)

{

case MOJOSHADER_ATTRIBUTE_BYTE: return GL_NONE; // oh well.

case MOJOSHADER_ATTRIBUTE_UBYTE: return GL_NONE; // oh well.

case MOJOSHADER_ATTRIBUTE_SHORT: return GL_SHORT;

case MOJOSHADER_ATTRIBUTE_USHORT: return GL_SHORT;

case MOJOSHADER_ATTRIBUTE_INT: return GL_INT;

case MOJOSHADER_ATTRIBUTE_UINT: return GL_INT;

case MOJOSHADER_ATTRIBUTE_FLOAT: return GL_FLOAT;

case MOJOSHADER_ATTRIBUTE_DOUBLE: return GL_DOUBLE;

} // switch

return GL_NONE; // oh well. Raises a GL error later.

} // opengl_posattr_type

static inline GLenum opengl_attr_type(const MOJOSHADER_attributeType type)

{

switch (type)

{

case MOJOSHADER_ATTRIBUTE_BYTE: return GL_BYTE;

case MOJOSHADER_ATTRIBUTE_UBYTE: return GL_UNSIGNED_BYTE;

case MOJOSHADER_ATTRIBUTE_SHORT: return GL_SHORT;

case MOJOSHADER_ATTRIBUTE_INT: return GL_INT;

case MOJOSHADER_ATTRIBUTE_UINT: return GL_UNSIGNED_INT;

case MOJOSHADER_ATTRIBUTE_FLOAT: return GL_FLOAT;

case MOJOSHADER_ATTRIBUTE_DOUBLE: return GL_DOUBLE;

} // switch

return GL_NONE; // oh well. Raises a GL error later.

} // opengl_attr_type

void MOJOSHADER_glSetVertexAttribute(MOJOSHADER_usage usage,

int index, unsigned int size,

MOJOSHADER_attributeType type,

int normalized, unsigned int stride,

const void *ptr)

{

return;

// Since glVertexPointer() lacks the flexibility that we can get from

// glVertexAttribPointer(), we set POSITION0 to a generic vertex

// attribute, and the shaders we generate know to look there instead of

// GLSL's gl_Position global variable. But to keep the GL handy, we

// also set the best possible equivalent with glVertexPointer(). Messy.

if ((usage == MOJOSHADER_USAGE_POSITION) && (index == 0))

{

// !!! FIXME: fails if size==1.

pglVertexPointer(size, opengl_posattr_type(type), stride, ptr);

} // if

int i;

GLuint gl_index = 0;

for (i = 0; i < bound_program->attribute_count; i++)

{

const AttributeMap *map = &bound_program->attributes[i];

const MOJOSHADER_attribute *a = map->attribute;

// !!! FIXME: is this array guaranteed to be sorted by usage?

// !!! FIXME: if so, we can break out of the loop if a->usage > usage.

if ((a->usage == usage) && (a->index == index))

{

gl_index = map->location;

break;

} // if

} // for

if (gl_index != 0)

{

const GLenum gl_type = opengl_attr_type(type);

pglVertexAttribPointer(gl_index, size, gl_type, norm, stride, ptr);

pglEnableVertexAttribArray(gl_index);

} // MOJOSHADER_glSetVertexAttribute

void MOJOSHADER_glProgramReady(void)

{

int i;

if (bound_program == NULL)

return; // nothing to do.

// !!! FIXME: don't push Uniforms if we know they haven't changed.

// push Uniforms to the program from our register files...

for (i = 0; i < bound_program->uniform_count; i++)

{

const UniformMap *map = &bound_program->uniforms[i];

const MOJOSHADER_uniform *u = map->uniform;

const MOJOSHADER_uniformType type = u->type;

const MOJOSHADER_shaderType shader_type = map->shader_type;

const int index = u->index;

const GLint location = map->location;

if (shader_type == MOJOSHADER_TYPE_VERTEX)

{

if (type == MOJOSHADER_UNIFORM_FLOAT)

} // if

else if (shader_type == MOJOSHADER_TYPE_PIXEL)

{

if (type == MOJOSHADER_UNIFORM_FLOAT)

} // else if

} // for

} // MOJOSHADER_glProgramReady