/**

* 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.

*/

#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

};

typedef struct

{

MOJOSHADER_shaderType shader_type;

const MOJOSHADER_uniform *uniform;

GLuint location;

} UniformMap;

typedef struct

{

const MOJOSHADER_attribute *attribute;

GLuint location;

} AttributeMap;

struct MOJOSHADER_glProgram

};

// Entry points in base OpenGL that lack function pointer prototypes...

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

struct MOJOSHADER_glContext

};

static MOJOSHADER_glContext *ctx = 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 = ctx->malloc_fn(len, ctx->malloc_data);

if (retval == NULL)

set_error("out of memory");

return retval;

} // Malloc

static inline void Free(void *ptr)

{

if (ptr != NULL)

ctx->free_fn(ptr, ctx->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) ctx->fn = (typ) loadsym(lookup, #fn, &ctx->have_##ext)

DO_LOOKUP(base_opengl, PFNGLGETSTRINGPROC, glGetString);

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 (major >= 0)

{

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

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

return 1;

} // if

// 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)

ctx->opengl_major = ctx->opengl_minor = 0;

else

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

} // parse_opengl_version

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

{

ctx->have_base_opengl = 1;

ctx->have_GL_ARB_shader_objects = 1;

ctx->have_GL_ARB_vertex_shader = 1;

ctx->have_GL_ARB_fragment_shader = 1;

ctx->have_GL_ARB_shading_language_100 = 1;

ctx->have_GL_NV_half_float = 1;

lookup_entry_points(lookup);

if (!ctx->have_base_opengl) // a func we should definitely have is MIA?

{

set_error("missing basic OpenGL entry points");

return 0;

} // if

parse_opengl_version((const char *) ctx->glGetString(GL_VERSION));

const char *extlist = (const char *) ctx->glGetString(GL_EXTENSIONS);

if (extlist == NULL)

extlist = ""; // just in case.

#define VERIFY_EXT(ext, major, minor) \

ctx->have_##ext = verify_extension(#ext, ctx->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);

VERIFY_EXT(GL_NV_half_float, -1, -1);

#undef VERIFY_EXT

#define REQUIRE_GL_EXTENSION(x) \

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

if (strcmp(ctx->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

MOJOSHADER_glContext *MOJOSHADER_glCreateContext(const char *_profile,

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

MOJOSHADER_malloc m, MOJOSHADER_free f,

void *d)

{

MOJOSHADER_glContext *current_ctx = ctx;

ctx = NULL;

if (m == NULL) m = internal_malloc;

if (f == NULL) f = internal_free;

ctx = (MOJOSHADER_glContext *) m(sizeof (MOJOSHADER_glContext), d);

if (ctx == NULL)

{

set_error("out of memory");

goto init_fail;

} // if

MOJOSHADER_glContext *retval = ctx;

memset(ctx, '\0', sizeof (MOJOSHADER_glContext));

ctx->malloc_fn = m;

ctx->free_fn = f;

ctx->malloc_data = d;

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

ctx->profile = MOJOSHADER_PROFILE_GLSL;

else

{

set_error("unknown profile");

goto init_fail;

} // else

if (!check_extensions(lookup))

goto init_fail;

MOJOSHADER_glBindProgram(NULL);

ctx = current_ctx;

return retval;

init_fail:

if (ctx != NULL)

f(ctx, d);

ctx = current_ctx;

return NULL;

} // MOJOSHADER_glCreateContext

void MOJOSHADER_glMakeContextCurrent(MOJOSHADER_glContext *_ctx)

{

ctx = _ctx;

} // MOJOSHADER_glMakeContextCurrent

MOJOSHADER_glShader *MOJOSHADER_glCompileShader(const unsigned char *tokenbuf,

const unsigned int bufsize)

{

MOJOSHADER_glShader *retval = NULL;

GLhandleARB shader = 0;

const MOJOSHADER_parseData *pd = MOJOSHADER_parse(ctx->profile, tokenbuf,

bufsize, ctx->malloc_fn,

ctx->free_fn,

ctx->malloc_data);

if (pd->error != NULL)

{

set_error(pd->error);

goto compile_shader_fail;

} // if

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

if (retval == NULL)

goto compile_shader_fail;

GLint ok = 0;

const GLenum shader_type = (pd->shader_type == MOJOSHADER_TYPE_PIXEL) ? GL_FRAGMENT_SHADER : GL_VERTEX_SHADER;

GLint shaderlen = (GLint) pd->output_len;

shader = ctx->glCreateShaderObject(shader_type);

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

ctx->glCompileShader(shader);

ctx->glGetObjectParameteriv(shader, GL_OBJECT_COMPILE_STATUS_ARB, &ok);

if (!ok)

{

GLsizei len = 0;

ctx->glGetInfoLog(shader, sizeof (error_buffer), &len, (GLchar *) error_buffer);

goto compile_shader_fail;

} // if

retval->parseData = pd;

retval->handle = shader;

retval->refcount = 1;

return retval;

compile_shader_fail:

MOJOSHADER_freeParseData(pd);

Free(retval);

if (shader != 0)

ctx->glDeleteObject(shader);

return NULL;

} // MOJOSHADER_glCompileShader

static void shader_unref(MOJOSHADER_glShader *shader)

{

if (shader != NULL)

{

const uint32 refcount = shader->refcount;

if (refcount > 1)

shader->refcount--;

else

{

ctx->glDeleteObject(shader->handle);

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

{

ctx->glDeleteObject(program->handle);

shader_unref(program->vertex);

shader_unref(program->fragment);

Free(program->attributes);

Free(program->uniforms);

Free(program);

} // else

} // if

} // program_unref

static void lookup_uniforms(MOJOSHADER_glProgram *program,

MOJOSHADER_glShader *shader)

{

int i;

const MOJOSHADER_parseData *pd = shader->parseData;

const MOJOSHADER_uniform *u = pd->uniforms;

const MOJOSHADER_shaderType shader_type = pd->shader_type;

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

{

const GLint loc = ctx->glGetUniformLocation(program->handle, u[i].name);

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

{

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

map->shader_type = shader_type;

map->uniform = &u[i];

map->location = (GLuint) loc;

program->uniform_count++;

} // if

} // for

} // lookup_uniforms

static void lookup_attributes(MOJOSHADER_glProgram *program)

{

int i;

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

const MOJOSHADER_attribute *a = pd->attributes;

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

{

const GLint loc = ctx->glGetAttribLocation(program->handle, a->name);

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

{

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

map->attribute = &a[i];

map->location = (GLuint) loc;

program->attribute_count++;

} // if

} // for

} // lookup_attributes

MOJOSHADER_glProgram *MOJOSHADER_glLinkProgram(MOJOSHADER_glShader *vshader,

MOJOSHADER_glShader *pshader)

{

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

return NULL;

MOJOSHADER_glProgram *retval = NULL;

const GLhandleARB program = ctx->glCreateProgramObject();

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

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

ctx->glLinkProgram(program);

GLint ok = 0;

ctx->glGetObjectParameteriv(program, GL_OBJECT_LINK_STATUS_ARB, &ok);

if (!ok)

{

GLsizei len = 0;

ctx->glGetInfoLog(program, sizeof (error_buffer), &len, (GLchar *) error_buffer);

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;

memset(retval->uniforms, '\0', sizeof (UniformMap) * numregs);

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);

lookup_uniforms(retval, vshader);

vshader->refcount++;

} // if

if (pshader != NULL)

{

lookup_uniforms(retval, pshader);

pshader->refcount++;

} // if

return retval;

link_program_fail:

if (retval != NULL)

{

Free(retval->uniforms);

Free(retval->attributes);

Free(retval);

} // if

ctx->glDeleteObject(program);

return NULL;

} // MOJOSHADER_glLinkProgram

void MOJOSHADER_glBindProgram(MOJOSHADER_glProgram *program)

{

GLhandleARB handle = 0;

int i;

if (program == ctx->bound_program)

return; // nothing to do.

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

// !!! FIXME: don't disable yet...see which ones get reused, and disable

// !!! FIXME: only what we don't need in MOJOSHADER_glProgramReady().

if (ctx->bound_program != NULL)

{

const int count = ctx->bound_program->attribute_count;

for (i = 0; i < count; i++)

{

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

ctx->glDisableVertexAttribArray(map->location);

} // if

} // for

if (program != NULL)

{

handle = program->handle;

program->refcount++;

} // if

ctx->glUseProgramObject(handle);

program_unref(ctx->bound_program);

ctx->bound_program = program;

} // MOJOSHADER_glBindProgram

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

{

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

} // maxuint

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

unsigned int vec4n)

{

const uint maxregs = STATICARRAYLEN(ctx->vs_reg_file_f) / 4;

if (idx < maxregs)

{

const uint cpy = (maxuint(maxregs - idx, vec4n) * sizeof (*data)) * 4;

memcpy(ctx->vs_reg_file_f + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetVertexShaderUniformF

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

unsigned int ivec4n)

{

const uint maxregs = STATICARRAYLEN(ctx->vs_reg_file_i) / 4;

if (idx < maxregs)

{

const uint cpy = (maxuint(maxregs - idx, ivec4n) * sizeof (*data)) * 4;

memcpy(ctx->vs_reg_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(ctx->vs_reg_file_f) / 4;

if (idx < maxregs)

{

uint8 *wptr = ctx->vs_reg_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,

unsigned int vec4n)

{

const uint maxregs = STATICARRAYLEN(ctx->ps_reg_file_f) / 4;

if (idx < maxregs)

{

const uint cpy = (maxuint(maxregs - idx, vec4n) * sizeof (*data)) * 4;

memcpy(ctx->ps_reg_file_f + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetPixelShaderUniformF

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

unsigned int ivec4n)

{

const uint maxregs = STATICARRAYLEN(ctx->ps_reg_file_i) / 4;

if (idx < maxregs)

{

const uint cpy = (maxuint(maxregs - idx, ivec4n) * sizeof (*data)) * 4;

memcpy(ctx->ps_reg_file_i + (idx * 4), data, cpy);

} // if

} // MOJOSHADER_glSetPixelShaderUniformI

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

unsigned int bcount)

{

const uint maxregs = STATICARRAYLEN(ctx->ps_reg_file_f) / 4;

if (idx < maxregs)

{

uint8 *wptr = ctx->ps_reg_file_b + idx;

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

while (wptr != endptr)

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

} // if

} // MOJOSHADER_glSetPixelShaderUniformB

static inline GLenum opengl_attr_type(const MOJOSHADER_attributeType type)

{

switch (type)

{

case MOJOSHADER_ATTRIBUTE_UNKNOWN: return GL_NONE; // oh well.

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_USHORT: return GL_UNSIGNED_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;

case MOJOSHADER_ATTRIBUTE_HALF_FLOAT:

if (ctx->have_GL_NV_half_float)

return GL_HALF_FLOAT_NV;

break;

} // switch

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

} // opengl_attr_type

void MOJOSHADER_glSetVertexAttribute(MOJOSHADER_usage usage,

const void *ptr)

{

if ((ctx->bound_program == NULL) || (ctx->bound_program->vertex == NULL))

return;

const GLenum gl_type = opengl_attr_type(type);

const GLboolean norm = (normalized) ? GL_TRUE : GL_FALSE;

GLuint gl_index = 0;

// We have to map POSITION0 to generic vertex attribute 0; the

// GL_ARB_vertex_shader spec says this is equivalent to using

// glVertexPointer(), but without the limitations of that entry point.

if ((usage != MOJOSHADER_USAGE_POSITION) || (index != 0))

{

int i;

const int count = ctx->bound_program->attribute_count;

for (i = 0; i < count; i++)

{

const AttributeMap *map = &ctx->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 if a->usage > usage.

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

{

gl_index = map->location;

break;

} // if

} // for

if (gl_index == 0)

return; // nothing to do, this shader doesn't use this stream.

} // if

ctx->glVertexAttribPointer(gl_index, size, gl_type, norm, stride, ptr);

ctx->glEnableVertexAttribArray(gl_index);

} // MOJOSHADER_glSetVertexAttribute

void MOJOSHADER_glProgramReady(void)

{

int i;

if (ctx->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...

const int count = ctx->bound_program->uniform_count;

for (i = 0; i < count; i++)

{

const UniformMap *map = &ctx->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)

ctx->glUniform4fv(location, 1, &ctx->vs_reg_file_f[index * 4]);

else if (type == MOJOSHADER_UNIFORM_INT)

ctx->glUniform4iv(location, 1, &ctx->vs_reg_file_i[index * 4]);

else if (type == MOJOSHADER_UNIFORM_BOOL)

ctx->glUniform1i(location, ctx->vs_reg_file_b[index]);

} // if

else if (shader_type == MOJOSHADER_TYPE_PIXEL)

{

if (type == MOJOSHADER_UNIFORM_FLOAT)

ctx->glUniform4fv(location, 1, &ctx->ps_reg_file_f[index * 4]);

else if (type == MOJOSHADER_UNIFORM_INT)

ctx->glUniform4iv(location, 1, &ctx->ps_reg_file_i[index * 4]);

else if (type == MOJOSHADER_UNIFORM_BOOL)

ctx->glUniform1i(location, ctx->ps_reg_file_b[index]);

} // else if

} // for

} // MOJOSHADER_glProgramReady

void MOJOSHADER_glDeleteProgram(MOJOSHADER_glProgram *program)

{

program_unref(program);

} // MOJOSHADER_glDeleteProgram

void MOJOSHADER_glDeleteShader(MOJOSHADER_glShader *shader)

{

shader_unref(shader);

} // MOJOSHADER_glDeleteShader

void MOJOSHADER_glDestroyContext(MOJOSHADER_glContext *_ctx)

{

MOJOSHADER_glContext *current_ctx = ctx;

ctx = _ctx;

MOJOSHADER_glBindProgram(NULL);

lookup_entry_points(NULL);

Free(ctx);

ctx = ((current_ctx == _ctx) ? NULL : current_ctx);

} // MOJOSHADER_glDestroyContext

// end of mojoshader_opengl.c ...