void gl_LoadExtensions()
{
InitContext();
CollectExtensions();
const char *version = Args->CheckValue("-glversion");
const char *glversion = (const char*)glGetString(GL_VERSION);
if (version == NULL)
{
version = glversion;
}
else
{
double v1 = strtod(version, NULL);
double v2 = strtod(glversion, NULL);
if (v2 < v1) version = glversion;
else Printf("Emulating OpenGL v %s\n", version);
}
float gl_version = (float)strtod(version, NULL) + 0.01f;
// Don't even start if it's lower than 2.0 or no framebuffers are available (The framebuffer extension is needed for glGenerateMipmapsEXT!)
if ((gl_version < 2.0f || !CheckExtension("GL_EXT_framebuffer_object")) && gl_version < 3.0f)
{
I_FatalError("Unsupported OpenGL version.\nAt least OpenGL 2.0 with framebuffer support is required to run " GAMENAME ".\n");
}
// add 0.01 to account for roundoff errors making the number a tad smaller than the actual version
gl.glslversion = strtod((char*)glGetString(GL_SHADING_LANGUAGE_VERSION), NULL) + 0.01f;
gl.vendorstring = (char*)glGetString(GL_VENDOR);
// first test for optional features
if (CheckExtension("GL_ARB_texture_compression")) gl.flags |= RFL_TEXTURE_COMPRESSION;
if (CheckExtension("GL_EXT_texture_compression_s3tc")) gl.flags |= RFL_TEXTURE_COMPRESSION_S3TC;
if ((gl_version >= 3.3f || CheckExtension("GL_ARB_sampler_objects")) && !Args->CheckParm("-nosampler"))
{
gl.flags |= RFL_SAMPLER_OBJECTS;
}
// The minimum requirement for the modern render path are GL 3.0 + uniform buffers. Also exclude the Linux Mesa driver at GL 3.0 because it errors out on shader compilation.
if (gl_version < 3.0f || (gl_version < 3.1f && (!CheckExtension("GL_ARB_uniform_buffer_object") || strstr(gl.vendorstring, "X.Org") != nullptr)))
{
gl.legacyMode = true;
gl.lightmethod = LM_LEGACY;
gl.buffermethod = BM_LEGACY;
gl.glslversion = 0;
gl.flags |= RFL_NO_CLIP_PLANES;
}
else
{
gl.legacyMode = false;
gl.lightmethod = LM_DEFERRED;
gl.buffermethod = BM_DEFERRED;
if (gl_version < 4.f)
{
#ifdef _WIN32
if (strstr(gl.vendorstring, "ATI Tech"))
{
gl.flags |= RFL_NO_CLIP_PLANES; // gl_ClipDistance is horribly broken on ATI GL3 drivers for Windows.
}
#endif
}
else if (gl_version < 4.5f)
{
// don't use GL 4.x features when running a GL 3.x context.
if (CheckExtension("GL_ARB_buffer_storage"))
{
// work around a problem with older AMD drivers: Their implementation of shader storage buffer objects is piss-poor and does not match uniform buffers even closely.
// Recent drivers, GL 4.4 don't have this problem, these can easily be recognized by also supporting the GL_ARB_buffer_storage extension.
if (CheckExtension("GL_ARB_shader_storage_buffer_object"))
{
// Shader storage buffer objects are broken on current Intel drivers.
if (strstr(gl.vendorstring, "Intel") == NULL)
{
gl.flags |= RFL_SHADER_STORAGE_BUFFER;
}
}
gl.flags |= RFL_BUFFER_STORAGE;
gl.lightmethod = LM_DIRECT;
gl.buffermethod = BM_PERSISTENT;
}
}
else
{
// Assume that everything works without problems on GL 4.5 drivers where these things are core features.
gl.flags |= RFL_SHADER_STORAGE_BUFFER | RFL_BUFFER_STORAGE;
gl.lightmethod = LM_DIRECT;
gl.buffermethod = BM_PERSISTENT;
}
if (gl_version >= 4.3f || CheckExtension("GL_ARB_invalidate_subdata")) gl.flags |= RFL_INVALIDATE_BUFFER;
if (gl_version >= 4.3f || CheckExtension("GL_KHR_debug")) gl.flags |= RFL_DEBUG;
const char *lm = Args->CheckValue("-lightmethod");
if (lm != NULL)
{
if (!stricmp(lm, "deferred") && gl.lightmethod == LM_DIRECT) gl.lightmethod = LM_DEFERRED;
}
lm = Args->CheckValue("-buffermethod");
if (lm != NULL)
{
if (!stricmp(lm, "deferred") && gl.buffermethod == BM_PERSISTENT) gl.buffermethod = BM_DEFERRED;
}
}
int v;
if (!gl.legacyMode && !(gl.flags & RFL_SHADER_STORAGE_BUFFER))
{
glGetIntegerv(GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &v);
gl.maxuniforms = v;
glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &v);
gl.maxuniformblock = v;
glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &v);
gl.uniformblockalignment = v;
}
else
{
gl.maxuniforms = 0;
gl.maxuniformblock = 0;
gl.uniformblockalignment = 0;
}
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &gl.max_texturesize);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
if (gl.legacyMode)
{
// fudge a bit with the framebuffer stuff to avoid redundancies in the main code. Some of the older cards do not have the ARB stuff but the calls are nearly identical.
FUDGE_FUNC(glGenerateMipmap, EXT);
FUDGE_FUNC(glGenFramebuffers, EXT);
FUDGE_FUNC(glBindFramebuffer, EXT);
FUDGE_FUNC(glDeleteFramebuffers, EXT);
FUDGE_FUNC(glFramebufferTexture2D, EXT);
FUDGE_FUNC(glGenerateMipmap, EXT);
FUDGE_FUNC(glGenFramebuffers, EXT);
FUDGE_FUNC(glBindFramebuffer, EXT);
FUDGE_FUNC(glDeleteFramebuffers, EXT);
FUDGE_FUNC(glFramebufferTexture2D, EXT);
FUDGE_FUNC(glFramebufferRenderbuffer, EXT);
FUDGE_FUNC(glGenRenderbuffers, EXT);
FUDGE_FUNC(glDeleteRenderbuffers, EXT);
FUDGE_FUNC(glRenderbufferStorage, EXT);
FUDGE_FUNC(glBindRenderbuffer, EXT);
FUDGE_FUNC(glCheckFramebufferStatus, EXT);
gl_PatchMenu();
}
}
static void APIENTRY LoadExtensions()
{
#ifdef unix
CollectExtensions();
#endif
// This loads any function pointers and flags that require a vaild render context to
// initialize properly
gl->vendorstring=(char*)glGetString(GL_VENDOR);
// First try the regular function
gl->BlendEquation = (PFNGLBLENDEQUATIONPROC)wglGetProcAddress("glBlendEquation");
// If that fails try the EXT version
if (!gl->BlendEquation) gl->BlendEquation = (PFNGLBLENDEQUATIONPROC)wglGetProcAddress("glBlendEquationEXT");
// If that fails use a no-op dummy
if (!gl->BlendEquation) gl->BlendEquation = glBlendEquationDummy;
if (CheckExtension("GL_ARB_texture_non_power_of_two")) gl->flags|=RFL_NPOT_TEXTURE;
#ifndef unix
PFNWGLSWAPINTERVALEXTPROC vs = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
if (vs) gl->SetVSync = vs;
#endif
glGetIntegerv(GL_MAX_TEXTURE_SIZE,&gl->max_texturesize);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
if (CheckExtension("GL_ARB_fragment_program"))
{
gl->GenProgramsARB = (PFNGLGENPROGRAMSARBPROC)wglGetProcAddress("glGenProgramsARB");
gl->BindProgramARB = (PFNGLBINDPROGRAMARBPROC)wglGetProcAddress("glBindProgramARB");
gl->ProgramStringARB = (PFNGLPROGRAMSTRINGARBPROC)wglGetProcAddress("glProgramStringARB");
gl->DeleteProgramsARB = (PFNGLDELETEPROGRAMSARBPROC) wglGetProcAddress("glDeleteProgramsARB");
gl->IsProgramARB = (PFNGLISPROGRAMARBPROC)wglGetProcAddress("glIsProgramARB");
gl->flags|=RFL_FRAGMENT_PROGRAM;
}
if (CheckExtension ("GL_ARB_shader_objects") &&
CheckExtension ("GL_ARB_vertex_shader") &&
CheckExtension ("GL_ARB_fragment_shader") &&
CheckExtension ("GL_ARB_shading_language_100"))
{
gl->DeleteObjectARB = (PFNGLDELETEOBJECTARBPROC)wglGetProcAddress("glDeleteObjectARB");
gl->GetHandleARB = (PFNGLGETHANDLEARBPROC)wglGetProcAddress("glGetHandleARB");
gl->DetachObjectARB = (PFNGLDETACHOBJECTARBPROC)wglGetProcAddress("glDetachObjectARB");
gl->CreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC)wglGetProcAddress("glCreateShaderObjectARB");
gl->ShaderSourceARB = (PFNGLSHADERSOURCEARBPROC)wglGetProcAddress("glShaderSourceARB");
gl->CompileShaderARB = (PFNGLCOMPILESHADERARBPROC)wglGetProcAddress("glCompileShaderARB");
gl->CreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC)wglGetProcAddress("glCreateProgramObjectARB");
gl->AttachObjectARB = (PFNGLATTACHOBJECTARBPROC)wglGetProcAddress("glAttachObjectARB");
gl->LinkProgramARB = (PFNGLLINKPROGRAMARBPROC)wglGetProcAddress("glLinkProgramARB");
gl->UseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC)wglGetProcAddress("glUseProgramObjectARB");
gl->ValidateProgramARB = (PFNGLVALIDATEPROGRAMARBPROC)wglGetProcAddress("glValidateProgramARB");
gl->VertexAttrib1fARB = (PFNGLVERTEXATTRIB1FARBPROC)wglGetProcAddress("glVertexAttrib1fARB");
gl->VertexAttrib4fARB = (PFNGLVERTEXATTRIB4FARBPROC)wglGetProcAddress("glVertexAttrib4fARB");
gl->GetAttribLocationARB = (PFNGLGETATTRIBLOCATIONARBPROC)wglGetProcAddress("glGetAttribLocationARB");
gl->Uniform1fARB = (PFNGLUNIFORM1FARBPROC)wglGetProcAddress("glUniform1fARB");
gl->Uniform2fARB = (PFNGLUNIFORM2FARBPROC)wglGetProcAddress("glUniform2fARB");
gl->Uniform3fARB = (PFNGLUNIFORM3FARBPROC)wglGetProcAddress("glUniform3fARB");
gl->Uniform4fARB = (PFNGLUNIFORM4FARBPROC)wglGetProcAddress("glUniform4fARB");
gl->Uniform1iARB = (PFNGLUNIFORM1IARBPROC)wglGetProcAddress("glUniform1iARB");
gl->Uniform2iARB = (PFNGLUNIFORM2IARBPROC)wglGetProcAddress("glUniform2iARB");
gl->Uniform3iARB = (PFNGLUNIFORM3IARBPROC)wglGetProcAddress("glUniform3iARB");
gl->Uniform4iARB = (PFNGLUNIFORM4IARBPROC)wglGetProcAddress("glUniform4iARB");
gl->Uniform1fvARB = (PFNGLUNIFORM1FVARBPROC)wglGetProcAddress("glUniform1fvARB");
gl->Uniform2fvARB = (PFNGLUNIFORM2FVARBPROC)wglGetProcAddress("glUniform2fvARB");
gl->Uniform3fvARB = (PFNGLUNIFORM3FVARBPROC)wglGetProcAddress("glUniform3fvARB");
gl->Uniform4fvARB = (PFNGLUNIFORM4FVARBPROC)wglGetProcAddress("glUniform4fvARB");
gl->Uniform1ivARB = (PFNGLUNIFORM1IVARBPROC)wglGetProcAddress("glUniform1ivARB");
gl->Uniform2ivARB = (PFNGLUNIFORM2IVARBPROC)wglGetProcAddress("glUniform2ivARB");
gl->Uniform3ivARB = (PFNGLUNIFORM3IVARBPROC)wglGetProcAddress("glUniform3ivARB");
gl->Uniform4ivARB = (PFNGLUNIFORM4IVARBPROC)wglGetProcAddress("glUniform4ivARB");
gl->UniformMatrix2fvARB = (PFNGLUNIFORMMATRIX2FVARBPROC)wglGetProcAddress("glUniformMatrix2fvARB");
gl->UniformMatrix3fvARB = (PFNGLUNIFORMMATRIX3FVARBPROC)wglGetProcAddress("glUniformMatrix3fvARB");
gl->UniformMatrix4fvARB = (PFNGLUNIFORMMATRIX4FVARBPROC)wglGetProcAddress("glUniformMatrix4fvARB");
gl->GetObjectParameterfvARB = (PFNGLGETOBJECTPARAMETERFVARBPROC)wglGetProcAddress("glGetObjectParameterfvARB");
gl->GetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC)wglGetProcAddress("glGetObjectParameterivARB");
gl->GetInfoLogARB = (PFNGLGETINFOLOGARBPROC)wglGetProcAddress("glGetInfoLogARB");
gl->GetAttachedObjectsARB = (PFNGLGETATTACHEDOBJECTSARBPROC)wglGetProcAddress("glGetAttachedObjectsARB");
gl->GetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC)wglGetProcAddress("glGetUniformLocationARB");
gl->GetActiveUniformARB = (PFNGLGETACTIVEUNIFORMARBPROC)wglGetProcAddress("glGetActiveUniformARB");
gl->GetUniformfvARB = (PFNGLGETUNIFORMFVARBPROC)wglGetProcAddress("glGetUniformfvARB");
gl->GetUniformivARB = (PFNGLGETUNIFORMIVARBPROC)wglGetProcAddress("glGetUniformivARB");
gl->GetShaderSourceARB = (PFNGLGETSHADERSOURCEARBPROC)wglGetProcAddress("glGetShaderSourceARB");
gl->flags|=RFL_GLSL;
}
if (CheckExtension("GL_ARB_occlusion_query"))
{
gl->GenQueries = (PFNGLGENQUERIESARBPROC)wglGetProcAddress("glGenQueriesARB");
gl->DeleteQueries = (PFNGLDELETEQUERIESARBPROC)wglGetProcAddress("glDeleteQueriesARB");
gl->GetQueryObjectuiv = (PFNGLGETQUERYOBJECTUIVARBPROC)wglGetProcAddress("glGetQueryObjectuivARB");
gl->BeginQuery = (PFNGLBEGINQUERYARBPROC)wglGetProcAddress("glBeginQueryARB");
gl->EndQuery = (PFNGLENDQUERYARBPROC)wglGetProcAddress("glEndQueryARB");
gl->flags|=RFL_OCCLUSION_QUERY;
}
else if (CheckExtension("GL_NV_occlusion_query"))
{
gl->GenQueries = (PFNGLGENOCCLUSIONQUERIESNVPROC)wglGetProcAddress("glGenOcclusionQueriesNV");
gl->DeleteQueries = (PFNGLDELETEOCCLUSIONQUERIESNVPROC)wglGetProcAddress("glDeleteOcclusionQueriesNV");
gl->GetQueryObjectuiv = (PFNGLGETOCCLUSIONQUERYUIVNVPROC)wglGetProcAddress("glGetOcclusionQueryuivNV");
glBeginOcclusionQueryNV = (PFNGLBEGINOCCLUSIONQUERYNVPROC)wglGetProcAddress("glBeginOcclusionQueryNV");
glEndOcclusionQueryNV = (PFNGLENDOCCLUSIONQUERYNVPROC)wglGetProcAddress("glEndOcclusionQueryNV");
gl->BeginQuery = BeginOcclusionQuery;
gl->EndQuery = EndOcclusionQuery;
gl->flags|=RFL_OCCLUSION_QUERY;
}
gl->ActiveTexture = (PFNGLACTIVETEXTUREPROC)wglGetProcAddress("glActiveTextureARB");
gl->MultiTexCoord2f = (PFNGLMULTITEXCOORD2FPROC) wglGetProcAddress("glMultiTexCoord2fARB");
gl->MultiTexCoord2fv = (PFNGLMULTITEXCOORD2FVPROC) wglGetProcAddress("glMultiTexCoord2fvARB");
}
static void APIENTRY LoadExtensions()
{
CollectExtensions();
const char *version = (const char*)glGetString(GL_VERSION);
// Don't even start if it's lower than 1.2
if (strcmp(version, "1.2") < 0)
{
I_FatalError("Unsupported OpenGL version.\nAt least GL 1.2 is required to run "GAMENAME".\n");
}
// This loads any function pointers and flags that require a vaild render context to
// initialize properly
gl->shadermodel = 0; // assume no shader support
gl->vendorstring=(char*)glGetString(GL_VENDOR);
// First try the regular function
gl->BlendEquation = (PFNGLBLENDEQUATIONPROC)wglGetProcAddress("glBlendEquation");
// If that fails try the EXT version
if (!gl->BlendEquation) gl->BlendEquation = (PFNGLBLENDEQUATIONPROC)wglGetProcAddress("glBlendEquationEXT");
// If that fails use a no-op dummy
if (!gl->BlendEquation) gl->BlendEquation = glBlendEquationDummy;
if (CheckExtension("GL_ARB_texture_non_power_of_two")) gl->flags|=RFL_NPOT_TEXTURE;
if (CheckExtension("GL_ARB_texture_compression")) gl->flags|=RFL_TEXTURE_COMPRESSION;
if (CheckExtension("GL_EXT_texture_compression_s3tc")) gl->flags|=RFL_TEXTURE_COMPRESSION_S3TC;
if (strstr(gl->vendorstring, "NVIDIA")) gl->flags|=RFL_NVIDIA;
else if (strstr(gl->vendorstring, "ATI Technologies")) gl->flags|=RFL_ATI;
if (strcmp(version, "2.0") >= 0) gl->flags|=RFL_GL_20;
if (strcmp(version, "2.1") >= 0) gl->flags|=RFL_GL_21;
if (strcmp(version, "3.0") >= 0) gl->flags|=RFL_GL_30;
#if !defined (unix) && !defined (__APPLE__)
PFNWGLSWAPINTERVALEXTPROC vs = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
if (vs) gl->SetVSync = vs;
#endif
glGetIntegerv(GL_MAX_TEXTURE_SIZE,&gl->max_texturesize);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
if (gl->flags & RFL_GL_20)
{
gl->DeleteShader = (PFNGLDELETESHADERPROC)wglGetProcAddress("glDeleteShader");
gl->DeleteProgram = (PFNGLDELETEPROGRAMPROC)wglGetProcAddress("glDeleteProgram");
gl->DetachShader = (PFNGLDETACHSHADERPROC)wglGetProcAddress("glDetachShader");
gl->CreateShader = (PFNGLCREATESHADERPROC)wglGetProcAddress("glCreateShader");
gl->ShaderSource = (PFNGLSHADERSOURCEPROC)wglGetProcAddress("glShaderSource");
gl->CompileShader = (PFNGLCOMPILESHADERPROC)wglGetProcAddress("glCompileShader");
gl->CreateProgram = (PFNGLCREATEPROGRAMPROC)wglGetProcAddress("glCreateProgram");
gl->AttachShader = (PFNGLATTACHSHADERPROC)wglGetProcAddress("glAttachShader");
gl->LinkProgram = (PFNGLLINKPROGRAMPROC)wglGetProcAddress("glLinkProgram");
gl->UseProgram = (PFNGLUSEPROGRAMPROC)wglGetProcAddress("glUseProgram");
gl->ValidateProgram = (PFNGLVALIDATEPROGRAMPROC)wglGetProcAddress("glValidateProgram");
gl->VertexAttrib1f = (PFNGLVERTEXATTRIB1FPROC)wglGetProcAddress("glVertexAttrib1f");
gl->VertexAttrib2f = (PFNGLVERTEXATTRIB2FPROC)wglGetProcAddress("glVertexAttrib2f");
gl->VertexAttrib4f = (PFNGLVERTEXATTRIB4FPROC)wglGetProcAddress("glVertexAttrib4f");
gl->VertexAttrib2fv = (PFNGLVERTEXATTRIB4FVPROC)wglGetProcAddress("glVertexAttrib2fv");
gl->VertexAttrib3fv = (PFNGLVERTEXATTRIB4FVPROC)wglGetProcAddress("glVertexAttrib3fv");
gl->VertexAttrib4fv = (PFNGLVERTEXATTRIB4FVPROC)wglGetProcAddress("glVertexAttrib4fv");
gl->VertexAttrib4ubv = (PFNGLVERTEXATTRIB4UBVPROC)wglGetProcAddress("glVertexAttrib4ubv");
gl->GetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC)wglGetProcAddress("glGetAttribLocation");
gl->BindAttribLocation = (PFNGLBINDATTRIBLOCATIONPROC)wglGetProcAddress("glBindAttribLocation");
gl->Uniform1f = (PFNGLUNIFORM1FPROC)wglGetProcAddress("glUniform1f");
gl->Uniform2f = (PFNGLUNIFORM2FPROC)wglGetProcAddress("glUniform2f");
gl->Uniform3f = (PFNGLUNIFORM3FPROC)wglGetProcAddress("glUniform3f");
gl->Uniform4f = (PFNGLUNIFORM4FPROC)wglGetProcAddress("glUniform4f");
gl->Uniform1i = (PFNGLUNIFORM1IPROC)wglGetProcAddress("glUniform1i");
gl->Uniform2i = (PFNGLUNIFORM2IPROC)wglGetProcAddress("glUniform2i");
gl->Uniform3i = (PFNGLUNIFORM3IPROC)wglGetProcAddress("glUniform3i");
gl->Uniform4i = (PFNGLUNIFORM4IPROC)wglGetProcAddress("glUniform4i");
gl->Uniform1fv = (PFNGLUNIFORM1FVPROC)wglGetProcAddress("glUniform1fv");
gl->Uniform2fv = (PFNGLUNIFORM2FVPROC)wglGetProcAddress("glUniform2fv");
gl->Uniform3fv = (PFNGLUNIFORM3FVPROC)wglGetProcAddress("glUniform3fv");
gl->Uniform4fv = (PFNGLUNIFORM4FVPROC)wglGetProcAddress("glUniform4fv");
gl->Uniform1iv = (PFNGLUNIFORM1IVPROC)wglGetProcAddress("glUniform1iv");
gl->Uniform2iv = (PFNGLUNIFORM2IVPROC)wglGetProcAddress("glUniform2iv");
gl->Uniform3iv = (PFNGLUNIFORM3IVPROC)wglGetProcAddress("glUniform3iv");
gl->Uniform4iv = (PFNGLUNIFORM4IVPROC)wglGetProcAddress("glUniform4iv");
gl->UniformMatrix2fv = (PFNGLUNIFORMMATRIX2FVPROC)wglGetProcAddress("glUniformMatrix2fv");
gl->UniformMatrix3fv = (PFNGLUNIFORMMATRIX3FVPROC)wglGetProcAddress("glUniformMatrix3fv");
gl->UniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC)wglGetProcAddress("glUniformMatrix4fv");
gl->GetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)wglGetProcAddress("glGetProgramInfoLog");
gl->GetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)wglGetProcAddress("glGetShaderInfoLog");
gl->GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)wglGetProcAddress("glGetUniformLocation");
gl->GetActiveUniform = (PFNGLGETACTIVEUNIFORMPROC)wglGetProcAddress("glGetActiveUniform");
gl->GetUniformfv = (PFNGLGETUNIFORMFVPROC)wglGetProcAddress("glGetUniformfv");
gl->GetUniformiv = (PFNGLGETUNIFORMIVPROC)wglGetProcAddress("glGetUniformiv");
gl->GetShaderSource = (PFNGLGETSHADERSOURCEPROC)wglGetProcAddress("glGetShaderSource");
gl->EnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)wglGetProcAddress("glEnableVertexAttribArray");
gl->DisableVertexAttribArray= (PFNGLDISABLEVERTEXATTRIBARRAYPROC)wglGetProcAddress("glDisableVertexAttribArray");
gl->VertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERPROC)wglGetProcAddress("glVertexAttribPointer");
// what'S the equivalent of this in GL 2.0???
gl->GetObjectParameteriv = (PFNGLGETOBJECTPARAMETERIVARBPROC)wglGetProcAddress("glGetObjectParameterivARB");
// Rules:
// SM4 will always use shaders. No option to switch them off is needed here.
// SM3 has shaders optional but they are off by default (they will have a performance impact
// SM2 only uses shaders for colormaps on camera textures and has no option to use them in general.
// On SM2 cards the shaders will be too slow and show visual bugs (at least on GF 6800.)
if (strcmp((const char*)glGetString(GL_SHADING_LANGUAGE_VERSION), "1.3") >= 0) gl->shadermodel = 4;
else if (CheckExtension("GL_NV_GPU_shader4")) gl->shadermodel = 4; // for pre-3.0 drivers that support GF8xxx.
else if (CheckExtension("GL_EXT_GPU_shader4")) gl->shadermodel = 4; // for pre-3.0 drivers that support GF8xxx.
else if (CheckExtension("GL_NV_vertex_program3")) gl->shadermodel = 3;
else if (!strstr(gl->vendorstring, "NVIDIA")) gl->shadermodel = 3;
else gl->shadermodel = 2; // Only for older NVidia cards which had notoriously bad shader support.
// Command line overrides for testing and problem cases.
if (Args->CheckParm("-sm2") && gl->shadermodel > 2) gl->shadermodel = 2;
else if (Args->CheckParm("-sm3") && gl->shadermodel > 3) gl->shadermodel = 3;
}
if (CheckExtension("GL_ARB_occlusion_query"))
{
gl->GenQueries = (PFNGLGENQUERIESARBPROC)wglGetProcAddress("glGenQueriesARB");
gl->DeleteQueries = (PFNGLDELETEQUERIESARBPROC)wglGetProcAddress("glDeleteQueriesARB");
gl->GetQueryObjectuiv = (PFNGLGETQUERYOBJECTUIVARBPROC)wglGetProcAddress("glGetQueryObjectuivARB");
gl->BeginQuery = (PFNGLBEGINQUERYARBPROC)wglGetProcAddress("glBeginQueryARB");
gl->EndQuery = (PFNGLENDQUERYPROC)wglGetProcAddress("glEndQueryARB");
gl->flags|=RFL_OCCLUSION_QUERY;
}
if (gl->flags & RFL_GL_21)
{
gl->BindBuffer = (PFNGLBINDBUFFERPROC)wglGetProcAddress("glBindBuffer");
gl->DeleteBuffers = (PFNGLDELETEBUFFERSPROC)wglGetProcAddress("glDeleteBuffers");
gl->GenBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffers");
gl->BufferData = (PFNGLBUFFERDATAPROC)wglGetProcAddress("glBufferData");
gl->BufferSubData = (PFNGLBUFFERSUBDATAPROC)wglGetProcAddress("glBufferSubData");
gl->MapBuffer = (PFNGLMAPBUFFERPROC)wglGetProcAddress("glMapBuffer");
gl->UnmapBuffer = (PFNGLUNMAPBUFFERPROC)wglGetProcAddress("glUnmapBuffer");
gl->flags |= RFL_VBO;
}
else if (CheckExtension("GL_ARB_vertex_buffer_object"))
{
gl->BindBuffer = (PFNGLBINDBUFFERPROC)wglGetProcAddress("glBindBufferARB");
gl->DeleteBuffers = (PFNGLDELETEBUFFERSPROC)wglGetProcAddress("glDeleteBuffersARB");
gl->GenBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffersARB");
gl->BufferData = (PFNGLBUFFERDATAPROC)wglGetProcAddress("glBufferDataARB");
gl->BufferSubData = (PFNGLBUFFERSUBDATAPROC)wglGetProcAddress("glBufferSubDataARB");
gl->MapBuffer = (PFNGLMAPBUFFERPROC)wglGetProcAddress("glMapBufferARB");
gl->UnmapBuffer = (PFNGLUNMAPBUFFERPROC)wglGetProcAddress("glUnmapBufferARB");
gl->flags |= RFL_VBO;
}
if (CheckExtension("GL_ARB_map_buffer_range"))
{
gl->MapBufferRange = (PFNGLMAPBUFFERRANGEPROC)wglGetProcAddress("glMapBufferRange");
gl->FlushMappedBufferRange = (PFNGLFLUSHMAPPEDBUFFERRANGEPROC)wglGetProcAddress("glFlushMappedBufferRange");
gl->flags|=RFL_MAP_BUFFER_RANGE;
}
if (CheckExtension("GL_ARB_framebuffer_object"))
{
gl->GenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)wglGetProcAddress("glGenFramebuffers");
gl->DeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)wglGetProcAddress("glDeleteFramebuffers");
gl->BindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)wglGetProcAddress("glBindFramebuffer");
gl->FramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC)wglGetProcAddress("glFramebufferTexture2D");
gl->CheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)wglGetProcAddress("glCheckFramebufferStatus");
gl->GenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)wglGetProcAddress("glGenRenderbuffers");
gl->DeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC)wglGetProcAddress("glDeleteRenderbuffers");
gl->BindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)wglGetProcAddress("glBindRenderbuffer");
gl->RenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)wglGetProcAddress("glRenderbufferStorage");
gl->FramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC)wglGetProcAddress("glFramebufferRenderbuffer");
gl->flags|=RFL_FRAMEBUFFER;
}
#if 0
else if (CheckExtension("GL_EXT_framebuffer_object") &&
CheckExtension("GL_EXT_packed_depth_stencil"))
{
gl->GenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)wglGetProcAddress("glGenFramebuffersEXT");
gl->BindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)wglGetProcAddress("glBindFramebufferEXT");
gl->FramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC)wglGetProcAddress("glFramebufferTexture2DEXT");
gl->GenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)wglGetProcAddress("glGenRenderbuffersEXT");
gl->BindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)wglGetProcAddress("glBindRenderbufferEXT");
gl->RenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)wglGetProcAddress("glRenderbufferStorageEXT");
gl->FramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC)wglGetProcAddress("glFramebufferRenderbufferEXT");
gl->flags|=RFL_FRAMEBUFFER;
}
#endif
#if 0
if (CheckExtension("GL_ARB_texture_buffer_object") &&
CheckExtension("GL_ARB_texture_float") &&
CheckExtension("GL_EXT_GPU_Shader4") &&
CheckExtension("GL_ARB_texture_rg") &&
gl->shadermodel == 4)
{
gl->TexBufferARB = (PFNGLTEXBUFFERARBPROC)wglGetProcAddress("glTexBufferARB");
gl->flags|=RFL_TEXTUREBUFFER;
}
#endif
gl->ActiveTexture = (PFNGLACTIVETEXTUREPROC)wglGetProcAddress("glActiveTextureARB");
gl->MultiTexCoord2f = (PFNGLMULTITEXCOORD2FPROC) wglGetProcAddress("glMultiTexCoord2fARB");
gl->MultiTexCoord2fv = (PFNGLMULTITEXCOORD2FVPROC) wglGetProcAddress("glMultiTexCoord2fvARB");
}
static bool ReadInitExtensions()
{
HDC hDC;
HGLRC hRC;
HWND dummy;
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
32, // color depth
0, 0, 0, 0, 0, 0,
0,
0,
0,
0, 0, 0, 0,
16, // z depth
0, // stencil buffer
0,
PFD_MAIN_PLANE,
0,
0, 0, 0
};
int pixelFormat;
// we have to create a dummy window to init stuff from or the full init stuff fails
dummy = InitDummy();
hDC = GetDC(dummy);
pixelFormat = ChoosePixelFormat(hDC, &pfd);
DescribePixelFormat(hDC, pixelFormat, sizeof(pfd), &pfd);
SetPixelFormat(hDC, pixelFormat, &pfd);
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
CollectExtensions(hDC);
wglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)wglGetProcAddress("wglChoosePixelFormatARB");
/*
if (wglChoosePixelFormatARB == NULL)
{
Printf("R_OPENGL: Couldn't find wglChoosePixelFormatARB.\n");
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(dummy, hDC);
ShutdownDummy(dummy);
return false;
}
*/
// any extra stuff here?
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(dummy, hDC);
ShutdownDummy(dummy);
return true;
}
