Files
unease/engine/render/gl_shared.cpp
Kirill Yurkin 719171e7d8 Big changes
2025-03-07 16:54:27 +03:00

427 lines
16 KiB
C++

#include "utils/logger.h"
#include "render/gl_shared.h"
#include "render/render_shared.h"
#include "render/render.h"
HDC hDC = NULL;
HGLRC hRC = NULL;
const char *GL_ErrorString( int err )
{
switch( err )
{
case GL_STACK_OVERFLOW:
return "GL_STACK_OVERFLOW";
case GL_STACK_UNDERFLOW:
return "GL_STACK_UNDERFLOW";
case GL_INVALID_ENUM:
return "GL_INVALID_ENUM";
case GL_INVALID_VALUE:
return "GL_INVALID_VALUE";
case GL_INVALID_OPERATION:
return "GL_INVALID_OPERATION";
case GL_OUT_OF_MEMORY:
return "GL_OUT_OF_MEMORY";
default:
return "UNKNOWN ERROR";
}
}
void GL_CheckError()
{
GLenum err;
if ( (err = glGetError()) != GL_NO_ERROR )
LogMsg( "OpenGL Error: %s", GL_ErrorString( err ) );// Msg("OpenGL Error: %s [%s]\n", GL_ErrorString(err), GL_TargetToString(tex->target));
}
void GL_CheckErrorEx( const char* filename, int line )
{
GLenum err;
if ( (err = glGetError()) != GL_NO_ERROR )
LogMsg( "OpenGL Error: %s at %s:%i", GL_ErrorString( err ), filename, line );// Msg("OpenGL Error: %s [%s]\n", GL_ErrorString(err), GL_TargetToString(tex->target));
}
void GL_CheckErrorFunction(const char* expression, const char* filename, int line)
{
GLenum err;
if ( (err = glGetError()) != GL_NO_ERROR )
LogMsg( "OpenGL Error: %s (%s) at %s:%i", expression, GL_ErrorString( err ), filename, line );// Msg("OpenGL Error: %s [%s]\n", GL_ErrorString(err), GL_TargetToString(tex->target));
}
void GL_SetTexture( int slot, uint texture )
{
}
uint GetGLBlendFactor(BlendFactor factor)
{
switch (factor)
{
case BF_ZERO:
return GL_ZERO;
case BF_ONE:
return GL_ONE;
case BF_SRC_COLOR:
return GL_SRC_COLOR;
case BF_ONE_MINUS_SRC_COLOR:
return GL_ONE_MINUS_SRC_COLOR;
case BF_DST_COLOR:
return GL_DST_COLOR;
case BF_ONE_MINUS_DST_COLOR:
return GL_ONE_MINUS_DST_COLOR;
case BF_SRC_ALPHA:
return GL_SRC_ALPHA;
case BF_ONE_MINUS_SRC_ALPHA:
return GL_ONE_MINUS_SRC_ALPHA;
case BF_DST_ALPHA:
return GL_DST_ALPHA;
case BF_ONE_MINUS_DST_ALPHA:
return GL_ONE_MINUS_DST_ALPHA;
case BF_CONSTANT_COLOR:
return GL_CONSTANT_COLOR;
case BF_ONE_MINUS_CONSTANT_COLOR:
return GL_ONE_MINUS_CONSTANT_COLOR;
case BF_CONSTANT_ALPHA:
return GL_CONSTANT_ALPHA;
case BF_ONE_MINUS_CONSTANT_ALPHA:
return GL_ONE_MINUS_CONSTANT_ALPHA;
default:
break;
}
return 0;
}
GLint GetGlWrap(TextureWrap wrap)
{
GLint param = 0;
if (wrap == TW_REPEAT)
param = GL_REPEAT;
else if (wrap == TW_MIRRORED_REPEAT)
param = GL_MIRRORED_REPEAT;
else if (wrap == TW_CLAMP_TO_EDGE)
param = GL_CLAMP_TO_EDGE;
else if (wrap == TW_CLAMP_TO_BORDER)
param = GL_CLAMP_TO_BORDER;
return param;
}
GLint GetGlTexFilter(TextureFilter filter)
{
GLint param = 0;
if (filter == TF_LINEAR)
param = GL_LINEAR;
else if (filter == TF_NEAREST)
param = GL_NEAREST;
else if (filter == TF_LINEAR_MIPMAP_LINEAR)
param = GL_LINEAR_MIPMAP_LINEAR;
else if (filter == TF_LINEAR_MIPMAP_NEAREST)
param = GL_LINEAR_MIPMAP_NEAREST;
else if (filter == TF_NEAREST_MIPMAP_LINEAR)
param = GL_NEAREST_MIPMAP_LINEAR;
else if (filter == TF_NEAREST_MIPMAP_NEAREST)
param = GL_NEAREST_MIPMAP_NEAREST;
return param;
}
uint GetGLPF(PixelFormat pf)
{
return 0;
//return uint32_t();
}
// Kirill: Remove to render_main.cpp or something else
uint GetGLInternalPF(PixelFormat pf)
{
switch (pf)
{
case PF_UNKNOWN:
return 0;
case PF_R8G8B8:
case PF_R8G8B8F:
return GL_RGB;
case PF_R8G8B8A8:
case PF_R8G8B8A8F:
return GL_RGBA;
}
return 0;
}
uint GetGLTypePF(PixelFormat pf)
{
switch (pf)
{
case PF_UNKNOWN:
return 0;
case PF_R8G8B8:
case PF_R8G8B8A8:
return GL_UNSIGNED_BYTE;
case PF_R8G8B8F:
case PF_R8G8B8A8F:
return GL_FLOAT;
}
return 0;
}
#define LOAD_GL_FUNC(functype, funcname) \
{ \
funcname = (functype)wglGetProcAddress(#funcname); \
if (funcname == NULL) \
LogMsg("Failed to load %s", #funcname); \
}
bool GL_CheckExtensions(const char* name)
{
const char* extensions = (const char*)glGetString(GL_EXTENSIONS);
if (strstr(extensions, name)) {
LogMsg("Found: %s", name);
return true;
}
LogMsg("Not found: %s", name);
return false;
}
void GL_CreateContext()
{
// create opengl context
PIXELFORMATDESCRIPTOR pfd;
int iFormat;
HWND hWnd = (HWND)R_GetWindow();
/* get the device context (DC) */
hDC = GetDC(hWnd);
/* set the pixel format for the DC */
ZeroMemory(&pfd, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
iFormat = ChoosePixelFormat(hDC, &pfd);
SetPixelFormat(hDC, iFormat, &pfd);
LogMsg("SetPixelFormat successful");
/* create and enable the render context (RC) */
hRC = wglCreateContext(hDC);
LogMsg("wglCreateContext successful");
wglMakeCurrent(hDC, hRC);
}
void GL_Load()
{
GL_CreateContext();
const char* vendor_string = (const char*)glGetString(GL_VENDOR);
const char* renderer_string = (const char*)glGetString(GL_RENDERER);
const char* version_string = (const char*)glGetString(GL_VERSION);
const char* extensions_string = (const char*)glGetString(GL_EXTENSIONS);
LogMsg("GL_VENDOR: %s", vendor_string);
LogMsg("GL_RENDERER: %s", renderer_string);
LogMsg("GL_VERSION: %s", version_string);
LogMsg("GL_EXTENSIONS: %s", extensions_string);
// OpenGL 1.3
LOAD_GL_FUNC( PFNGLACTIVETEXTUREPROC, glActiveTexture);
LOAD_GL_FUNC( PFNGLSAMPLECOVERAGEPROC, glSampleCoverage);
LOAD_GL_FUNC( PFNGLCOMPRESSEDTEXIMAGE3DPROC, glCompressedTexImage3D);
LOAD_GL_FUNC( PFNGLCOMPRESSEDTEXIMAGE2DPROC, glCompressedTexImage2D);
LOAD_GL_FUNC( PFNGLCOMPRESSEDTEXIMAGE1DPROC, glCompressedTexImage1D);
LOAD_GL_FUNC( PFNGLCOMPRESSEDTEXSUBIMAGE3DPROC, glCompressedTexSubImage3D);
LOAD_GL_FUNC( PFNGLCOMPRESSEDTEXSUBIMAGE2DPROC, glCompressedTexSubImage2D);
LOAD_GL_FUNC( PFNGLCOMPRESSEDTEXSUBIMAGE1DPROC, glCompressedTexSubImage1D);
LOAD_GL_FUNC( PFNGLGETCOMPRESSEDTEXIMAGEPROC, glGetCompressedTexImage);
LOAD_GL_FUNC( PFNGLCLIENTACTIVETEXTUREPROC, glClientActiveTexture);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1DPROC, glMultiTexCoord1d);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1DVPROC, glMultiTexCoord1dv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1FPROC, glMultiTexCoord1f);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1FVPROC, glMultiTexCoord1fv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1IPROC, glMultiTexCoord1i);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1IVPROC, glMultiTexCoord1iv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1SPROC, glMultiTexCoord1s);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD1SVPROC, glMultiTexCoord1sv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2DPROC, glMultiTexCoord2d);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2DVPROC, glMultiTexCoord2dv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2FPROC, glMultiTexCoord2f);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2FVPROC, glMultiTexCoord2fv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2IPROC, glMultiTexCoord2i);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2IVPROC, glMultiTexCoord2iv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2SPROC, glMultiTexCoord2s);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD2SVPROC, glMultiTexCoord2sv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3DPROC, glMultiTexCoord3d);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3DVPROC, glMultiTexCoord3dv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3FPROC, glMultiTexCoord3f);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3FVPROC, glMultiTexCoord3fv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3IPROC, glMultiTexCoord3i);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3IVPROC, glMultiTexCoord3iv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3SPROC, glMultiTexCoord3s);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD3SVPROC, glMultiTexCoord3sv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4DPROC, glMultiTexCoord4d);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4DVPROC, glMultiTexCoord4dv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4FPROC, glMultiTexCoord4f);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4FVPROC, glMultiTexCoord4fv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4IPROC, glMultiTexCoord4i);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4IVPROC, glMultiTexCoord4iv);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4SPROC, glMultiTexCoord4s);
LOAD_GL_FUNC( PFNGLMULTITEXCOORD4SVPROC, glMultiTexCoord4sv);
LOAD_GL_FUNC( PFNGLLOADTRANSPOSEMATRIXFPROC, glLoadTransposeMatrixf);
LOAD_GL_FUNC( PFNGLLOADTRANSPOSEMATRIXDPROC, glLoadTransposeMatrixd);
LOAD_GL_FUNC( PFNGLMULTTRANSPOSEMATRIXFPROC, glMultTransposeMatrixf);
LOAD_GL_FUNC( PFNGLMULTTRANSPOSEMATRIXDPROC, glMultTransposeMatrixd);
// OpenGL 1.5
LOAD_GL_FUNC(PFNGLGENQUERIESPROC, glGenQueries);
LOAD_GL_FUNC(PFNGLDELETEQUERIESPROC, glDeleteQueries);
LOAD_GL_FUNC(PFNGLISQUERYPROC, glIsQuery);
LOAD_GL_FUNC(PFNGLBEGINQUERYPROC, glBeginQuery);
LOAD_GL_FUNC(PFNGLENDQUERYPROC, glEndQuery);
LOAD_GL_FUNC(PFNGLGETQUERYIVPROC, glGetQueryiv);
LOAD_GL_FUNC(PFNGLGETQUERYOBJECTIVPROC, glGetQueryObjectiv);
LOAD_GL_FUNC(PFNGLGETQUERYOBJECTUIVPROC, glGetQueryObjectuiv);
LOAD_GL_FUNC(PFNGLBINDBUFFERPROC, glBindBuffer);
LOAD_GL_FUNC(PFNGLDELETEBUFFERSPROC, glDeleteBuffers);
LOAD_GL_FUNC(PFNGLGENBUFFERSPROC, glGenBuffers);
LOAD_GL_FUNC(PFNGLISBUFFERPROC, glIsBuffer);
LOAD_GL_FUNC(PFNGLBUFFERDATAPROC, glBufferData);
LOAD_GL_FUNC(PFNGLBUFFERSUBDATAPROC, glBufferSubData);
LOAD_GL_FUNC(PFNGLGETBUFFERSUBDATAPROC, glGetBufferSubData);
LOAD_GL_FUNC(PFNGLMAPBUFFERPROC, glMapBuffer);
LOAD_GL_FUNC(PFNGLUNMAPBUFFERPROC, glUnmapBuffer);
LOAD_GL_FUNC(PFNGLGETBUFFERPARAMETERIVPROC, glGetBufferParameteriv);
LOAD_GL_FUNC(PFNGLGETBUFFERPOINTERVPROC, glGetBufferPointerv);
//LogMsg("GL_Load: glActiveTexture=%i glGenBuffers=%i", !!glActiveTexture, !!glGenBuffers);
g_EXTFramebufferSupport = GL_CheckExtensions("GL_EXT_framebuffer_object");
if (g_EXTFramebufferSupport)
{
LOAD_GL_FUNC(PFNGLISRENDERBUFFEREXTPROC, glIsRenderbufferEXT);
LOAD_GL_FUNC(PFNGLBINDRENDERBUFFEREXTPROC, glBindRenderbufferEXT);
LOAD_GL_FUNC(PFNGLDELETERENDERBUFFERSEXTPROC, glDeleteRenderbuffersEXT);
LOAD_GL_FUNC(PFNGLGENRENDERBUFFERSEXTPROC, glGenRenderbuffersEXT);
LOAD_GL_FUNC(PFNGLRENDERBUFFERSTORAGEEXTPROC, glRenderbufferStorageEXT);
LOAD_GL_FUNC(PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC, glGetRenderbufferParameterivEXT);
LOAD_GL_FUNC(PFNGLISFRAMEBUFFEREXTPROC, glIsFramebufferEXT);
LOAD_GL_FUNC(PFNGLBINDFRAMEBUFFEREXTPROC, glBindFramebufferEXT);
LOAD_GL_FUNC(PFNGLDELETEFRAMEBUFFERSEXTPROC, glDeleteFramebuffersEXT);
LOAD_GL_FUNC(PFNGLGENFRAMEBUFFERSEXTPROC, glGenFramebuffersEXT);
LOAD_GL_FUNC(PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC, glCheckFramebufferStatusEXT);
LOAD_GL_FUNC(PFNGLFRAMEBUFFERTEXTURE1DEXTPROC, glFramebufferTexture1DEXT);
LOAD_GL_FUNC(PFNGLFRAMEBUFFERTEXTURE2DEXTPROC, glFramebufferTexture2DEXT);
LOAD_GL_FUNC(PFNGLFRAMEBUFFERTEXTURE3DEXTPROC, glFramebufferTexture3DEXT);
LOAD_GL_FUNC(PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC, glFramebufferRenderbufferEXT);
LOAD_GL_FUNC(PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC, glGetFramebufferAttachmentParameterivEXT);
LOAD_GL_FUNC(PFNGLGENERATEMIPMAPEXTPROC, glGenerateMipmapEXT);
}
}
void GL_SwapBuffers(int inverval)
{
}
// Extensions
bool g_EXTFramebufferSupport = false;
// OpenGL 1.3
PFNGLACTIVETEXTUREPROC glActiveTexture = NULL;
PFNGLSAMPLECOVERAGEPROC glSampleCoverage = NULL;
PFNGLCOMPRESSEDTEXIMAGE3DPROC glCompressedTexImage3D = NULL;
PFNGLCOMPRESSEDTEXIMAGE2DPROC glCompressedTexImage2D = NULL;
PFNGLCOMPRESSEDTEXIMAGE1DPROC glCompressedTexImage1D = NULL;
PFNGLCOMPRESSEDTEXSUBIMAGE3DPROC glCompressedTexSubImage3D = NULL;
PFNGLCOMPRESSEDTEXSUBIMAGE2DPROC glCompressedTexSubImage2D = NULL;
PFNGLCOMPRESSEDTEXSUBIMAGE1DPROC glCompressedTexSubImage1D = NULL;
PFNGLGETCOMPRESSEDTEXIMAGEPROC glGetCompressedTexImage = NULL;
PFNGLCLIENTACTIVETEXTUREPROC glClientActiveTexture = NULL;
PFNGLMULTITEXCOORD1DPROC glMultiTexCoord1d = NULL;
PFNGLMULTITEXCOORD1DVPROC glMultiTexCoord1dv = NULL;
PFNGLMULTITEXCOORD1FPROC glMultiTexCoord1f = NULL;
PFNGLMULTITEXCOORD1FVPROC glMultiTexCoord1fv = NULL;
PFNGLMULTITEXCOORD1IPROC glMultiTexCoord1i = NULL;
PFNGLMULTITEXCOORD1IVPROC glMultiTexCoord1iv = NULL;
PFNGLMULTITEXCOORD1SPROC glMultiTexCoord1s = NULL;
PFNGLMULTITEXCOORD1SVPROC glMultiTexCoord1sv = NULL;
PFNGLMULTITEXCOORD2DPROC glMultiTexCoord2d = NULL;
PFNGLMULTITEXCOORD2DVPROC glMultiTexCoord2dv = NULL;
PFNGLMULTITEXCOORD2FPROC glMultiTexCoord2f = NULL;
PFNGLMULTITEXCOORD2FVPROC glMultiTexCoord2fv = NULL;
PFNGLMULTITEXCOORD2IPROC glMultiTexCoord2i = NULL;
PFNGLMULTITEXCOORD2IVPROC glMultiTexCoord2iv = NULL;
PFNGLMULTITEXCOORD2SPROC glMultiTexCoord2s = NULL;
PFNGLMULTITEXCOORD2SVPROC glMultiTexCoord2sv = NULL;
PFNGLMULTITEXCOORD3DPROC glMultiTexCoord3d = NULL;
PFNGLMULTITEXCOORD3DVPROC glMultiTexCoord3dv = NULL;
PFNGLMULTITEXCOORD3FPROC glMultiTexCoord3f = NULL;
PFNGLMULTITEXCOORD3FVPROC glMultiTexCoord3fv = NULL;
PFNGLMULTITEXCOORD3IPROC glMultiTexCoord3i = NULL;
PFNGLMULTITEXCOORD3IVPROC glMultiTexCoord3iv = NULL;
PFNGLMULTITEXCOORD3SPROC glMultiTexCoord3s = NULL;
PFNGLMULTITEXCOORD3SVPROC glMultiTexCoord3sv = NULL;
PFNGLMULTITEXCOORD4DPROC glMultiTexCoord4d = NULL;
PFNGLMULTITEXCOORD4DVPROC glMultiTexCoord4dv = NULL;
PFNGLMULTITEXCOORD4FPROC glMultiTexCoord4f = NULL;
PFNGLMULTITEXCOORD4FVPROC glMultiTexCoord4fv = NULL;
PFNGLMULTITEXCOORD4IPROC glMultiTexCoord4i = NULL;
PFNGLMULTITEXCOORD4IVPROC glMultiTexCoord4iv = NULL;
PFNGLMULTITEXCOORD4SPROC glMultiTexCoord4s = NULL;
PFNGLMULTITEXCOORD4SVPROC glMultiTexCoord4sv = NULL;
PFNGLLOADTRANSPOSEMATRIXFPROC glLoadTransposeMatrixf = NULL;
PFNGLLOADTRANSPOSEMATRIXDPROC glLoadTransposeMatrixd = NULL;
PFNGLMULTTRANSPOSEMATRIXFPROC glMultTransposeMatrixf = NULL;
PFNGLMULTTRANSPOSEMATRIXDPROC glMultTransposeMatrixd = NULL;
// OpenGL 1.5
PFNGLGENQUERIESPROC glGenQueries = NULL;
PFNGLDELETEQUERIESPROC glDeleteQueries = NULL;
PFNGLISQUERYPROC glIsQuery = NULL;
PFNGLBEGINQUERYPROC glBeginQuery = NULL;
PFNGLENDQUERYPROC glEndQuery = NULL;
PFNGLGETQUERYIVPROC glGetQueryiv = NULL;
PFNGLGETQUERYOBJECTIVPROC glGetQueryObjectiv = NULL;
PFNGLGETQUERYOBJECTUIVPROC glGetQueryObjectuiv = NULL;
PFNGLBINDBUFFERPROC glBindBuffer = NULL;
PFNGLDELETEBUFFERSPROC glDeleteBuffers = NULL;
PFNGLGENBUFFERSPROC glGenBuffers = NULL;
PFNGLISBUFFERPROC glIsBuffer = NULL;
PFNGLBUFFERDATAPROC glBufferData = NULL;
PFNGLBUFFERSUBDATAPROC glBufferSubData = NULL;
PFNGLGETBUFFERSUBDATAPROC glGetBufferSubData = NULL;
PFNGLMAPBUFFERPROC glMapBuffer = NULL;
PFNGLUNMAPBUFFERPROC glUnmapBuffer = NULL;
PFNGLGETBUFFERPARAMETERIVPROC glGetBufferParameteriv = NULL;
PFNGLGETBUFFERPOINTERVPROC glGetBufferPointerv = NULL;
// GL_EXT_framebuffer_object
PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT = NULL;
PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT = NULL;
PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT = NULL;
PFNGLGENRENDERBUFFERSEXTPROC glGenRenderbuffersEXT = NULL;
PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT = NULL;
PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC glGetRenderbufferParameterivEXT = NULL;
PFNGLISFRAMEBUFFEREXTPROC glIsFramebufferEXT = NULL;
PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT = NULL;
PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT = NULL;
PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT = NULL;
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT = NULL;
PFNGLFRAMEBUFFERTEXTURE1DEXTPROC glFramebufferTexture1DEXT = NULL;
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT = NULL;
PFNGLFRAMEBUFFERTEXTURE3DEXTPROC glFramebufferTexture3DEXT = NULL;
PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC glFramebufferRenderbufferEXT = NULL;
PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC glGetFramebufferAttachmentParameterivEXT = NULL;
PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT = NULL;