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mojoshader_opengl.c
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/**
* 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.
*/
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
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// !!! FIXME: most of these _MSC_VER should probably be _WINDOWS?
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#ifdef _MSC_VER
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h> // GL headers need this for WINGDIAPI definition.
#endif
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#if (defined(__APPLE__) && defined(__MACH__))
#define PLATFORM_MACOSX 1
#endif
#if PLATFORM_MACOSX
#include <Carbon/Carbon.h>
#endif
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#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
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#define GL_GLEXT_LEGACY 1
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#include "GL/gl.h"
#include "GL/glext.h"
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#ifndef GL_HALF_FLOAT
#define GL_HALF_FLOAT 0x140B
#endif
#ifndef GL_HALF_FLOAT_OES
#define GL_HALF_FLOAT_OES 0x8D61
#endif
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struct MOJOSHADER_glShader
{
const MOJOSHADER_parseData *parseData;
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GLuint handle;
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uint32 refcount;
};
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typedef struct
{
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MOJOSHADER_shaderType shader_type;
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const MOJOSHADER_uniform *uniform;
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GLuint location;
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union {
GLint b;
GLint i[4];
GLfloat f[4];
} value;
GLfloat *uniform_array_buffer;
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} UniformMap;
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typedef struct
{
MOJOSHADER_shaderType shader_type;
const MOJOSHADER_sampler *sampler;
GLuint location;
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GLint value;
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} SamplerMap;
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typedef struct
{
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const MOJOSHADER_attribute *attribute;
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GLuint location;
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} AttributeMap;
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struct MOJOSHADER_glProgram
{
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MOJOSHADER_glShader *vertex;
MOJOSHADER_glShader *fragment;
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GLuint handle;
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uint32 uniform_count;
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UniformMap *uniforms;
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uint32 sampler_count;
SamplerMap *samplers;
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uint32 attribute_count;
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AttributeMap *attributes;
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uint32 refcount;
};
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#ifndef WINGDIAPI
#define WINGDIAPI
#endif
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// Entry points in base OpenGL that lack function pointer prototypes...
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typedef WINGDIAPI void (APIENTRYP PFNGLGETINTEGERVPROC) (GLenum pname, GLint *params);
typedef WINGDIAPI const GLubyte * (APIENTRYP PFNGLGETSTRINGPROC) (GLenum name);
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typedef WINGDIAPI GLenum (APIENTRYP PFNGLGETERRORPROC) (void);
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typedef WINGDIAPI void (APIENTRYP PFNGLENABLEPROC) (GLenum cap);
typedef WINGDIAPI void (APIENTRYP PFNGLDISABLEPROC) (GLenum cap);
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struct MOJOSHADER_glContext
{
// Allocators...
MOJOSHADER_malloc malloc_fn;
MOJOSHADER_free free_fn;
void *malloc_data;
// The constant register files...
// Man, it kills me how much memory this takes...
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GLfloat vs_reg_file_f[8192 * 4];
GLint vs_reg_file_i[2047 * 4];
GLint vs_reg_file_b[2047];
GLfloat ps_reg_file_f[8192 * 4];
GLint ps_reg_file_i[2047 * 4];
GLint ps_reg_file_b[2047];
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GLuint sampler_reg_file[16];
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// GL stuff...
int opengl_major;
int opengl_minor;
MOJOSHADER_glProgram *bound_program;
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char profile[16];
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// Extensions...
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int have_base_opengl;
int have_GL_ARB_vertex_program;
int have_GL_ARB_fragment_program;
int have_GL_NV_vertex_program2_option;
int have_GL_NV_fragment_program2;
int have_GL_NV_vertex_program3;
int have_GL_NV_gpu_program4;
int have_GL_ARB_shader_objects;
int have_GL_ARB_vertex_shader;
int have_GL_ARB_fragment_shader;
int have_GL_ARB_shading_language_100;
int have_GL_NV_half_float;
int have_GL_ARB_half_float_vertex;
int have_GL_OES_vertex_half_float;
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// Entry points...
PFNGLGETSTRINGPROC glGetString;
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PFNGLGETERRORPROC glGetError;
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PFNGLGETINTEGERVPROC glGetIntegerv;
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PFNGLENABLEPROC glEnable;
PFNGLDISABLEPROC glDisable;
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PFNGLDELETEOBJECTARBPROC glDeleteObject;
PFNGLATTACHOBJECTARBPROC glAttachObject;
PFNGLCOMPILESHADERARBPROC glCompileShader;
PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObject;
PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObject;
PFNGLDISABLEVERTEXATTRIBARRAYARBPROC glDisableVertexAttribArray;
PFNGLENABLEVERTEXATTRIBARRAYARBPROC glEnableVertexAttribArray;
PFNGLGETATTRIBLOCATIONARBPROC glGetAttribLocation;
PFNGLGETINFOLOGARBPROC glGetInfoLog;
PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameteriv;
PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocation;
PFNGLLINKPROGRAMARBPROC glLinkProgram;
PFNGLSHADERSOURCEARBPROC glShaderSource;
PFNGLUNIFORM1IARBPROC glUniform1i;
PFNGLUNIFORM4FVARBPROC glUniform4fv;
PFNGLUNIFORM4IVARBPROC glUniform4iv;
PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObject;
PFNGLVERTEXATTRIBPOINTERARBPROC glVertexAttribPointer;
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PFNGLGETPROGRAMIVARBPROC glGetProgramivARB;
PFNGLGETPROGRAMSTRINGARBPROC glGetProgramStringARB;
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PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB;
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PFNGLPROGRAMLOCALPARAMETERI4IVNVPROC glProgramLocalParameterI4ivNV;
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PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB;
PFNGLGENPROGRAMSARBPROC glGenProgramsARB;
PFNGLBINDPROGRAMARBPROC glBindProgramARB;
PFNGLPROGRAMSTRINGARBPROC glProgramStringARB;
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// interface for profile-specific things.
int (*profileMaxUniforms)(MOJOSHADER_shaderType shader_type);
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int (*profileCompileShader)(const MOJOSHADER_parseData *pd, GLuint *s);
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void (*profileDeleteShader)(const GLuint shader);
void (*profileDeleteProgram)(const GLuint program);
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GLint (*profileGetAttribLocation)(MOJOSHADER_glProgram *program, int idx);
GLint (*profileGetUniformLocation)(MOJOSHADER_glProgram *, MOJOSHADER_glShader *, int);
GLint (*profileGetSamplerLocation)(MOJOSHADER_glProgram *, MOJOSHADER_glShader *, int);
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GLuint (*profileLinkProgram)(MOJOSHADER_glShader *, MOJOSHADER_glShader *);
void (*profileUseProgramObject)(MOJOSHADER_glProgram *program);
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void (*profileUniform4fv)(const MOJOSHADER_parseData *, GLint, GLsizei, GLfloat *);
void (*profileUniform4iv)(const MOJOSHADER_parseData *, GLint, GLsizei, GLint *);
void (*profileUniform1i)(const MOJOSHADER_parseData *, GLint, GLint);
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void (*profileSetSampler)(GLint loc, GLuint sampler);
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int (*profileMustLoadConstantArrays)(void);
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};
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static MOJOSHADER_glContext *ctx = NULL;
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// 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
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#if PLATFORM_MACOSX
static inline int macosx_version_atleast(int x, int y, int z)
{
static int checked = 0;
static int combined = 0;
if (!checked)
{
long ver, major, minor, patch;
int convert = 0;
if (Gestalt(gestaltSystemVersion, &ver) != noErr)
ver = 0x1000; // oh well.
else if (ver < 0x1030)
convert = 1; // split (ver) into (major),(minor),(patch).
else
{
// presumably this won't fail. But if it does, we'll just use the
// original version value. This might cut the value--10.12.11 will
// come out to 10.9.9, for example--but it's better than nothing.
if (Gestalt(gestaltSystemVersionMajor, &major) != noErr)
convert = 1;
else if (Gestalt(gestaltSystemVersionMinor, &minor) != noErr)
convert = 1;
else if (Gestalt(gestaltSystemVersionBugFix, &patch) != noErr)
convert = 1;
} // else
if (convert)
{
major = ((ver & 0xFF00) >> 8);
major = (((major / 16) * 10) + (major % 16));
minor = ((ver & 0xF0) >> 4);
patch = (ver & 0xF);
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} // if
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combined = (major << 16) | (minor << 8) | patch;
checked = 1;
} // if
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return (combined >= ((x << 16) | (y << 8) | z));
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} // macosx_version_atleast
#endif
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static inline void *Malloc(const size_t len)
{
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void *retval = ctx->malloc_fn((int) len, ctx->malloc_data);
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if (retval == NULL)
set_error("out of memory");
return retval;
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} // Malloc
static inline void Free(void *ptr)
{
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if (ptr != NULL)
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ctx->free_fn(ptr, ctx->malloc_data);
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} // Free
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static inline void toggle_gl_state(GLenum state, int val)
{
if (val)
ctx->glEnable(state);
else
ctx->glDisable(state);
} // toggle_gl_state
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// profile-specific implementations...
#if SUPPORT_PROFILE_GLSL
static inline GLenum glsl_shader_type(const MOJOSHADER_shaderType t)
{
if (t == MOJOSHADER_TYPE_VERTEX)
return GL_VERTEX_SHADER;
else if (t == MOJOSHADER_TYPE_PIXEL)
return GL_FRAGMENT_SHADER;
// !!! FIXME: geometry shaders?
return GL_NONE;
} // glsl_shader_type
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static int impl_GLSL_MustLoadConstantArrays(void) { return 1; }
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static int impl_GLSL_MaxUniforms(MOJOSHADER_shaderType shader_type)
{
GLenum pname = GL_NONE;
GLint val = 0;
if (shader_type == MOJOSHADER_TYPE_VERTEX)
pname = GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB;
else if (shader_type == MOJOSHADER_TYPE_PIXEL)
pname = GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB;
else
return -1;
ctx->glGetIntegerv(pname, &val);
return (int) val;
} // impl_GLSL_MaxUniforms
static int impl_GLSL_CompileShader(const MOJOSHADER_parseData *pd, GLuint *s)
{
GLint ok = 0;
GLint shaderlen = (GLint) pd->output_len;
const GLenum shader_type = glsl_shader_type(pd->shader_type);
GLuint 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);
*s = 0;
return 0;
} // if
*s = shader;
return 1;
} // impl_GLSL_CompileShader
static void impl_GLSL_DeleteShader(const GLuint shader)
{
ctx->glDeleteObject(shader);
} // impl_GLSL_DeleteShader
static void impl_GLSL_DeleteProgram(const GLuint program)
{
ctx->glDeleteObject(program);
} // impl_GLSL_DeleteProgram
static GLint impl_GLSL_GetUniformLocation(MOJOSHADER_glProgram *program,
MOJOSHADER_glShader *shader, int idx)
{
return ctx->glGetUniformLocation(program->handle,
shader->parseData->uniforms[idx].name);
} // impl_GLSL_GetUniformLocation
static GLint impl_GLSL_GetSamplerLocation(MOJOSHADER_glProgram *program,
MOJOSHADER_glShader *shader, int idx)
{
return ctx->glGetUniformLocation(program->handle,
shader->parseData->samplers[idx].name);
} // impl_GLSL_GetSamplerLocation
static GLint impl_GLSL_GetAttribLocation(MOJOSHADER_glProgram *program, int idx)
{
const MOJOSHADER_parseData *pd = program->vertex->parseData;
const MOJOSHADER_attribute *a = pd->attributes;
return ctx->glGetAttribLocation(program->handle, a[idx].name);
} // impl_GLSL_GetAttribLocation
static GLuint impl_GLSL_LinkProgram(MOJOSHADER_glShader *vshader,
MOJOSHADER_glShader *pshader)
{
const GLuint 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);
ctx->glDeleteObject(program);
return 0;
} // if
return program;
} // impl_GLSL_LinkProgram
static void impl_GLSL_UseProgramObject(MOJOSHADER_glProgram *program)
{
ctx->glUseProgramObject((program != NULL) ? program->handle : 0);
} // impl_GLSL_UseProgramObject
static void impl_GLSL_Uniform4fv(const MOJOSHADER_parseData *pd, GLint loc,
GLsizei siz, GLfloat *v)
{
ctx->glUniform4fv(loc, siz, v);
} // impl_GLSL_Uniform4fv
static void impl_GLSL_Uniform4iv(const MOJOSHADER_parseData *pd, GLint loc,
GLsizei siz, GLint *v)
{
ctx->glUniform4iv(loc, siz, v);
} // impl_GLSL_Uniform4iv
static void impl_GLSL_Uniform1i(const MOJOSHADER_parseData *pd, GLint loc,
GLint v)
{
ctx->glUniform1i(loc, v);
} // impl_GLSL_Uniform1i
static void impl_GLSL_SetSampler(GLint loc, GLuint sampler)
{
ctx->glUniform1i(loc, sampler);
} // impl_GLSL_SetSampler
#endif // SUPPORT_PROFILE_GLSL
#if SUPPORT_PROFILE_ARB1
static inline GLenum arb1_shader_type(const MOJOSHADER_shaderType t)
{
if (t == MOJOSHADER_TYPE_VERTEX)
return GL_VERTEX_PROGRAM_ARB;
else if (t == MOJOSHADER_TYPE_PIXEL)
return GL_FRAGMENT_PROGRAM_ARB;
// !!! FIXME: geometry shaders?
return GL_NONE;
} // arb1_shader_type
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static int impl_ARB1_MustLoadConstantArrays(void) { return 0; }
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static int impl_ARB1_MaxUniforms(MOJOSHADER_shaderType shader_type)
{
GLint retval = 0;
const GLenum program_type = arb1_shader_type(shader_type);
if (program_type == GL_NONE)
return -1;
ctx->glGetProgramivARB(program_type, GL_MAX_PROGRAM_PARAMETERS_ARB, &retval);
return (int) retval; // !!! FIXME: times four?
} // impl_ARB1_MaxUniforms
static int impl_ARB1_CompileShader(const MOJOSHADER_parseData *pd, GLuint *s)
{
GLint shaderlen = (GLint) pd->output_len;
const GLenum shader_type = arb1_shader_type(pd->shader_type);
GLuint shader = 0;
ctx->glGenProgramsARB(1, &shader);
ctx->glGetError(); // flush any existing error state.
ctx->glBindProgramARB(shader_type, shader);
ctx->glProgramStringARB(shader_type, GL_PROGRAM_FORMAT_ASCII_ARB,
shaderlen, pd->output);
if (ctx->glGetError() == GL_INVALID_OPERATION)
{
GLint pos = 0;
ctx->glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &pos);
const GLubyte *errstr = ctx->glGetString(GL_PROGRAM_ERROR_STRING_ARB);
snprintf(error_buffer, sizeof (error_buffer),
"ARB1 compile error at position %d: %s",
(int) pos, (const char *) errstr);
ctx->glBindProgramARB(shader_type, 0);
ctx->glDeleteProgramsARB(1, &shader);
*s = 0;
return 0;
} // if
*s = shader;
return 1;
} // impl_ARB1_CompileShader
static void impl_ARB1_DeleteShader(const GLuint _shader)
{
GLuint shader = _shader; // const removal.
ctx->glDeleteProgramsARB(1, &shader);
} // impl_ARB1_DeleteShader
static void impl_ARB1_DeleteProgram(const GLuint program)
{
// no-op. ARB1 doesn't have real linked programs.
} // impl_GLSL_DeleteProgram
static GLint impl_ARB1_GetUniformLocation(MOJOSHADER_glProgram *program,
MOJOSHADER_glShader *shader, int idx)
{
assert(shader->parseData->uniforms[idx].type == MOJOSHADER_UNIFORM_FLOAT);
return shader->parseData->uniforms[idx].index; // !!! FIXME: doesn't work if there are int or bool uniforms!
} // impl_ARB1_GetUniformLocation
static GLint impl_ARB1_GetSamplerLocation(MOJOSHADER_glProgram *program,
MOJOSHADER_glShader *shader, int idx)
{
return shader->parseData->samplers[idx].index;
} // impl_ARB1_GetSamplerLocation
static GLint impl_ARB1_GetAttribLocation(MOJOSHADER_glProgram *program, int idx)
{
return idx; // map to vertex arrays in the same order as the parseData.
} // impl_ARB1_GetAttribLocation
static GLuint impl_ARB1_LinkProgram(MOJOSHADER_glShader *vshader,
MOJOSHADER_glShader *pshader)
{
// there is no formal linking in ARB1...just return a unique value.
static GLuint retval = 1;
return retval++;
} // impl_ARB1_LinkProgram
static void impl_ARB1_UseProgramObject(MOJOSHADER_glProgram *program)
{
GLuint vhandle = 0;
GLuint phandle = 0;
if (program != NULL)
{
if (program->vertex != NULL)
vhandle = program->vertex->handle;
if (program->fragment != NULL)
phandle = program->fragment->handle;
} // if
toggle_gl_state(GL_VERTEX_PROGRAM_ARB, vhandle != 0);
toggle_gl_state(GL_FRAGMENT_PROGRAM_ARB, phandle != 0);
ctx->glBindProgramARB(GL_VERTEX_PROGRAM_ARB, vhandle);
ctx->glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, phandle);
} // impl_ARB1_UseProgramObject
static void impl_ARB1_Uniform4fv(const MOJOSHADER_parseData *pd, GLint loc,
GLsizei siz, GLfloat *v)
{
int i;
const GLenum shader_type = arb1_shader_type(pd->shader_type);
for (i = 0; i < siz; i++, v += 4)
ctx->glProgramLocalParameter4fvARB(shader_type, loc + i, v);
} // impl_ARB1_Uniform4fv
static void impl_ARB1_Uniform4iv(const MOJOSHADER_parseData *pd, GLint loc,
GLsizei siz, GLint *v)
{
int i;
const GLenum shader_type = arb1_shader_type(pd->shader_type);
for (i = 0; i < siz; i++, v += 4)
{
GLfloat f[4] = {
(GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], (GLfloat) v[3]
};
ctx->glProgramLocalParameter4fvARB(shader_type, loc + i, f);
} // for
} // impl_ARB1_Uniform4iv
static void impl_ARB1_Uniform1i(const MOJOSHADER_parseData *pd, GLint loc,
GLint _v)
{
const GLenum shader_type = arb1_shader_type(pd->shader_type);
const GLfloat v = (GLfloat) _v;
GLfloat f[4] = { v, v, v, v };
ctx->glProgramLocalParameter4fvARB(shader_type, loc, f);
} // impl_ARB1_Uniform1i
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static void impl_NV4_Uniform4iv(const MOJOSHADER_parseData *pd, GLint loc,
GLsizei siz, GLint *v)
{
int i;
const GLenum shader_type = arb1_shader_type(pd->shader_type);
for (i = 0; i < siz; i++, v += 4)
ctx->glProgramLocalParameterI4ivNV(shader_type, loc + i, v);
} // impl_NV4_Uniform4iv
static void impl_NV4_Uniform1i(const MOJOSHADER_parseData *pd, GLint loc,
GLint _v)
{
const GLenum shader_type = arb1_shader_type(pd->shader_type);
GLint v[4] = { _v, _v, _v, _v };
ctx->glProgramLocalParameterI4ivNV(shader_type, loc, v);
} // impl_NV4_Uniform1i
601
602
603
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607
608
609
610
611
612
613
614
615
static void impl_ARB1_SetSampler(GLint loc, GLuint sampler)
{
// no-op in this profile...arb1 uses the texture units as-is.
assert(loc == (GLint) sampler);
} // impl_ARB1_SetSampler
#endif // SUPPORT_PROFILE_ARB1
const char *MOJOSHADER_glGetError(void)
{
return error_buffer;
} // MOJOSHADER_glGetError
616
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621
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623
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628
629
630
631
632
633
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637
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))
{
638
639
640
641
642
643
#define DO_LOOKUP(ext, typ, fn) { \
int exist = ctx->have_##ext; \
ctx->fn = (typ) loadsym(lookup, #fn, &exist); \
ctx->have_##ext = exist; \
}
644
DO_LOOKUP(base_opengl, PFNGLGETSTRINGPROC, glGetString);
645
DO_LOOKUP(base_opengl, PFNGLGETERRORPROC, glGetError);
646
DO_LOOKUP(base_opengl, PFNGLGETINTEGERVPROC, glGetIntegerv);
647
648
DO_LOOKUP(base_opengl, PFNGLENABLEPROC, glEnable);
DO_LOOKUP(base_opengl, PFNGLDISABLEPROC, glDisable);
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653
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657
658
659
660
661
662
663
664
665
666
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);
667
668
669
DO_LOOKUP(GL_ARB_vertex_program, PFNGLVERTEXATTRIBPOINTERARBPROC, glVertexAttribPointer);
DO_LOOKUP(GL_ARB_vertex_program, PFNGLGETPROGRAMIVARBPROC, glGetProgramivARB);
DO_LOOKUP(GL_ARB_vertex_program, PFNGLGETPROGRAMSTRINGARBPROC, glGetProgramStringARB);
670
DO_LOOKUP(GL_ARB_vertex_program, PFNGLPROGRAMLOCALPARAMETER4FVARBPROC, glProgramLocalParameter4fvARB);
671
672
673
674
DO_LOOKUP(GL_ARB_vertex_program, PFNGLDELETEPROGRAMSARBPROC, glDeleteProgramsARB);
DO_LOOKUP(GL_ARB_vertex_program, PFNGLGENPROGRAMSARBPROC, glGenProgramsARB);
DO_LOOKUP(GL_ARB_vertex_program, PFNGLBINDPROGRAMARBPROC, glBindProgramARB);
DO_LOOKUP(GL_ARB_vertex_program, PFNGLPROGRAMSTRINGARBPROC, glProgramStringARB);
675
DO_LOOKUP(GL_NV_gpu_program4, PFNGLPROGRAMLOCALPARAMETERI4IVNVPROC, glProgramLocalParameterI4ivNV);
676
677
678
679
680
681
682
683
684
685
686
#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.
687
688
689
else if (!ctx->have_base_opengl)
return 0; // don't bother checking, we're missing basic functionality.
690
// See if it's in the spec for this GL implementation's version.
691
692
if (major >= 0)
{
693
if ( ((ctx->opengl_major << 16) | (ctx->opengl_minor & 0xFFFF)) >=
694
695
696
((major << 16) | (minor & 0xFFFF)) )
return 1;
} // if
697
698
699
700
701
702
703
704
705
706
707
708
709
710
// 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
711
static void parse_opengl_version_str(const char *verstr, int *maj, int *min)
712
713
{
if (verstr == NULL)
714
*maj = *min = 0;
715
else
716
717
718
719
720
721
722
sscanf(verstr, "%d.%d", maj, min);
} // parse_opengl_version_str
static inline void parse_opengl_version(const char *verstr)
{
parse_opengl_version_str(verstr, &ctx->opengl_major, &ctx->opengl_minor);
723
724
725
} // parse_opengl_version
726
727
728
729
730
731
732
733
734
735
736
737
738
739
static int glsl_version_atleast(int maj, int min)
{
int glslmin = 0;
int glslmaj = 0;
ctx->glGetError(); // flush any existing error state.
const GLenum enumval = GL_SHADING_LANGUAGE_VERSION_ARB;
const char *str = (const char *) ctx->glGetString(enumval);
if (ctx->glGetError() == GL_INVALID_ENUM)
return 0; // this is a basic, 1.0-compliant implementation.
parse_opengl_version_str(str, &glslmaj, &glslmin);
return ( (glslmaj > maj) || ((glslmaj == maj) && (glslmin >= min)) );
} // glsl_version_atleast
740
static void load_extensions(void *(*lookup)(const char *fnname))
741
{
742
743
const char *extlist = NULL;
744
ctx->have_base_opengl = 1;
745
746
ctx->have_GL_ARB_vertex_program = 1;
ctx->have_GL_ARB_fragment_program = 1;
747
748
ctx->have_GL_NV_vertex_program2_option = 1;
ctx->have_GL_NV_fragment_program2 = 1;
749
ctx->have_GL_NV_vertex_program3 = 1;
750
ctx->have_GL_NV_gpu_program4 = 1;
751
752
753
754
755
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;
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757
ctx->have_GL_ARB_half_float_vertex = 1;
ctx->have_GL_OES_vertex_half_float = 1;
758
759
760
lookup_entry_points(lookup);
761
if (!ctx->have_base_opengl)
762
set_error("missing basic OpenGL entry points");
763
764
765
766
767
else
{
parse_opengl_version((const char *) ctx->glGetString(GL_VERSION));
extlist = (const char *) ctx->glGetString(GL_EXTENSIONS);
} // else
768
769
770
771
772
if (extlist == NULL)
extlist = ""; // just in case.
#define VERIFY_EXT(ext, major, minor) \
773
ctx->have_##ext = verify_extension(#ext, ctx->have_##ext, extlist, major, minor)
774
775
776
VERIFY_EXT(GL_ARB_vertex_program, -1, -1);
VERIFY_EXT(GL_ARB_fragment_program, -1, -1);
777
778
779
780
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);
781
782
VERIFY_EXT(GL_NV_vertex_program2_option, -1, -1);
VERIFY_EXT(GL_NV_fragment_program2, -1, -1);
783
VERIFY_EXT(GL_NV_vertex_program3, -1, -1);
784
VERIFY_EXT(GL_NV_half_float, -1, -1);
785
786
VERIFY_EXT(GL_ARB_half_float_vertex, 3, 0);
VERIFY_EXT(GL_OES_vertex_half_float, -1, -1);
787
788
#undef VERIFY_EXT
789
790
791
792
793
} // load_extensions
static int valid_profile(const char *profile)
{
794
795
796
797
798
// If running on Mac OS X <= 10.4, don't ever pick GLSL, even if
// the system claims it is available.
#if PLATFORM_MACOSX
const int allow_glsl = macosx_version_atleast(10, 5, 0);
#else
799
const int allow_glsl = 1;
800
801
#endif
802
803
if (!ctx->have_base_opengl)
return 0;
804
805
806
#define MUST_HAVE(p, x) \
if (!ctx->have_##x) { set_error(#p " profile needs " #x); return 0; }
807
808
809
810
811
812
if (profile == NULL)
{
set_error("NULL profile");
return 0;
} // if
813
814
815
816
817
818
819
820
#if SUPPORT_PROFILE_ARB1
else if (strcmp(profile, MOJOSHADER_PROFILE_ARB1) == 0)
{
MUST_HAVE(MOJOSHADER_PROFILE_ARB1, GL_ARB_vertex_program);
MUST_HAVE(MOJOSHADER_PROFILE_ARB1, GL_ARB_fragment_program);
} // else if
821
822
823
824
825
826
827
else if (strcmp(profile, MOJOSHADER_PROFILE_NV2) == 0)
{
MUST_HAVE(MOJOSHADER_PROFILE_NV2, GL_ARB_vertex_program);
MUST_HAVE(MOJOSHADER_PROFILE_NV2, GL_ARB_fragment_program);
MUST_HAVE(MOJOSHADER_PROFILE_NV2, GL_NV_vertex_program2_option);
MUST_HAVE(MOJOSHADER_PROFILE_NV2, GL_NV_fragment_program2);
} // else if
828
829
830
831
832
833
834
835
else if (strcmp(profile, MOJOSHADER_PROFILE_NV3) == 0)
{
MUST_HAVE(MOJOSHADER_PROFILE_NV3, GL_ARB_vertex_program);
MUST_HAVE(MOJOSHADER_PROFILE_NV3, GL_ARB_fragment_program);
MUST_HAVE(MOJOSHADER_PROFILE_NV3, GL_NV_vertex_program3);
MUST_HAVE(MOJOSHADER_PROFILE_NV3, GL_NV_fragment_program2);
} // else if
836
837
838
839
840
else if (strcmp(profile, MOJOSHADER_PROFILE_NV4) == 0)
{
MUST_HAVE(MOJOSHADER_PROFILE_NV4, GL_NV_gpu_program4);
} // else if
841
842
#endif
843
#if SUPPORT_PROFILE_GLSL
844
else if ((allow_glsl) && (strcmp(profile, MOJOSHADER_PROFILE_GLSL120) == 0))
845
846
847
848
849
850
{
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_shader_objects);
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_vertex_shader);
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_fragment_shader);
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_shading_language_100);
// if you got here, you have all the extensions.
851
if (!glsl_version_atleast(1, 20))
852
853
854
return 0;
} // else if
855
else if ((allow_glsl) && (strcmp(profile, MOJOSHADER_PROFILE_GLSL) == 0))
856
{
857
858
859
860
861
862
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_shader_objects);
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_vertex_shader);
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_fragment_shader);
MUST_HAVE(MOJOSHADER_PROFILE_GLSL, GL_ARB_shading_language_100);
} // else if
#endif
863
864
865
else
{
866
set_error("unknown or unsupported profile");
867
868
869
return 0;
} // else
870
#undef MUST_HAVE
871
872
return 1;
873
874
875
} // valid_profile
876
877
878
879
880
881
static const char *profile_priorities[] = {
#if SUPPORT_PROFILE_GLSL
MOJOSHADER_PROFILE_GLSL120,
MOJOSHADER_PROFILE_GLSL,
#endif
#if SUPPORT_PROFILE_ARB1
882
MOJOSHADER_PROFILE_NV4,
883
884
885
886
887
888
889
890
MOJOSHADER_PROFILE_NV3,
MOJOSHADER_PROFILE_NV2,
MOJOSHADER_PROFILE_ARB1,
#endif
};
int MOJOSHADER_glAvailableProfiles(void *(*lookup)(const char *fnname),
const char **profs, const int size)
891
{
892
int retval = 0;
893
894
895
896
897
898
899
900
901
902
MOJOSHADER_glContext _ctx;
MOJOSHADER_glContext *current_ctx = ctx;
ctx = &_ctx;
memset(ctx, '\0', sizeof (MOJOSHADER_glContext));
load_extensions(lookup);
if (ctx->have_base_opengl)
{
int i;
903
for (i = 0; i < STATICARRAYLEN(profile_priorities); i++)
904
{
905
906
const char *profile = profile_priorities[i];
if (valid_profile(profile))
907
{
908
909
910
if (retval < size)
profs[retval] = profile;
retval++;
911
912
913
} // if
} // for
} // if
914
915
916
ctx = current_ctx;
return retval;
917
918
919
920
921
922
923
924
925
926
927
928
929
} // MOJOSHADER_glAvailableProfiles
const char *MOJOSHADER_glBestProfile(void *(*lookup)(const char *fnname))
{
const char *prof[STATICARRAYLEN(profile_priorities)];
if (MOJOSHADER_glAvailableProfiles(lookup, prof, STATICARRAYLEN(prof)) <= 0)
{
set_error("no profiles available");
return NULL;
} // if
return prof[0]; // profiles are sorted "best" to "worst."
930
931
932
933
} // MOJOSHADER_glBestProfile
MOJOSHADER_glContext *MOJOSHADER_glCreateContext(const char *profile,
934
935
936
void *(*lookup)(const char *fnname),
MOJOSHADER_malloc m, MOJOSHADER_free f,
void *d)
937
{
938
MOJOSHADER_glContext *retval = NULL;
939
940
941
MOJOSHADER_glContext *current_ctx = ctx;
ctx = NULL;
942
943
if (m == NULL) m = MOJOSHADER_internal_malloc;
if (f == NULL) f = MOJOSHADER_internal_free;
944
945
946
947
948
949
950
951
952
953
954
955
ctx = (MOJOSHADER_glContext *) m(sizeof (MOJOSHADER_glContext), d);
if (ctx == NULL)
{
set_error("out of memory");
goto init_fail;
} // if
memset(ctx, '\0', sizeof (MOJOSHADER_glContext));
ctx->malloc_fn = m;
ctx->free_fn = f;
ctx->malloc_data = d;
956
snprintf(ctx->profile, sizeof (ctx->profile), "%s", profile);
957
958
959
load_extensions(lookup);
if (!valid_profile(profile))
960
goto init_fail;
961
962
MOJOSHADER_glBindProgram(NULL);
963
964
965
// !!! FIXME: generalize this part.
if (profile == NULL) {}
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
#if SUPPORT_PROFILE_GLSL
else if ( (strcmp(profile, MOJOSHADER_PROFILE_GLSL) == 0) ||
(strcmp(profile, MOJOSHADER_PROFILE_GLSL120) == 0) )
{
ctx->profileMaxUniforms = impl_GLSL_MaxUniforms;
ctx->profileCompileShader = impl_GLSL_CompileShader;
ctx->profileDeleteShader = impl_GLSL_DeleteShader;
ctx->profileDeleteProgram = impl_GLSL_DeleteProgram;
ctx->profileGetAttribLocation = impl_GLSL_GetAttribLocation;
ctx->profileGetUniformLocation = impl_GLSL_GetUniformLocation;
ctx->profileGetSamplerLocation = impl_GLSL_GetSamplerLocation;
ctx->profileLinkProgram = impl_GLSL_LinkProgram;
ctx->profileUseProgramObject = impl_GLSL_UseProgramObject;
ctx->profileUniform4fv = impl_GLSL_Uniform4fv;
ctx->profileUniform4iv = impl_GLSL_Uniform4iv;
ctx->profileUniform1i = impl_GLSL_Uniform1i;
ctx->profileSetSampler = impl_GLSL_SetSampler;
984
ctx->profileMustLoadConstantArrays = impl_GLSL_MustLoadConstantArrays;
985
986
} // if
#endif
987
988
989
#if SUPPORT_PROFILE_ARB1
else if ( (strcmp(profile, MOJOSHADER_PROFILE_ARB1) == 0) ||
990
(strcmp(profile, MOJOSHADER_PROFILE_NV2) == 0) ||
991
992
(strcmp(profile, MOJOSHADER_PROFILE_NV3) == 0) ||
(strcmp(profile, MOJOSHADER_PROFILE_NV4) == 0) )
993
994
995
996
997
998
999
1000
{
ctx->profileMaxUniforms = impl_ARB1_MaxUniforms;
ctx->profileCompileShader = impl_ARB1_CompileShader;
ctx->profileDeleteShader = impl_ARB1_DeleteShader;
ctx->profileDeleteProgram = impl_ARB1_DeleteProgram;
ctx->profileGetAttribLocation = impl_ARB1_GetAttribLocation;
ctx->profileGetUniformLocation = impl_ARB1_GetUniformLocation;
ctx->profileGetSamplerLocation = impl_ARB1_GetSamplerLocation;