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dhewm3/neo/renderer/qgl.h
Daniel Gibson 0f4b6e7245 Support BPTC (BC7) textures in .DDS 
Can have better image quality than S3TC (DXT1-5).

based on a patch by Github user "Manoa1911":
https://github.com/dhewm/dhewm3/issues/447#issuecomment-2254369525

Only supports DXGI_FORMAT_BC7_UNORM - I hope that's enough?
BC7/BPTC is supported by all GPUs that support DX11 (or newer)
or OpenGL 4.2 (or newer). That should be the case for Radeon HD 5000
and newer, Geforce 400 and newer and Intel iGPUs from Ivy Bridge on.
Those GPUs are from 2009/2010, 2012 for Intel.

fix #447
2025-03-05 05:56:46 +01:00

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6.5 KiB
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/*
===========================================================================
Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.
This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").
Doom 3 Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Doom 3 Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Doom 3 Source Code. If not, see <http://www.gnu.org/licenses/>.
In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code. If not, please request a copy in writing from id Software at the address below.
If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
===========================================================================
*/
/*
** QGL.H
*/
#ifndef __QGL_H__
#define __QGL_H__
#if defined( ID_DEDICATED ) && defined( _WIN32 )
// to allow stubbing gl on windows, define WINGDIAPI to nothing - it would otherwise be
// extended to __declspec(dllimport) on MSVC (our stub is no dll.)
#ifdef WINGDIAPI
#pragma push_macro("WINGDIAPI")
#undef WINGDIAPI
#define WINGDIAPI
#endif
#endif
#ifdef D3_SDL3
#include <SDL3/SDL_opengl.h>
#else // SDL1.2 or SDL2
#include <SDL_opengl.h>
#endif
#if defined( ID_DEDICATED ) && defined( _WIN32 )
// restore WINGDIAPI
#ifdef WINGDIAPI
#pragma pop_macro("WINGDIAPI")
#endif
#endif
typedef void (*GLExtension_t)(void);
#ifdef __cplusplus
extern "C" {
#endif
GLExtension_t GLimp_ExtensionPointer( const char *name );
#ifdef __cplusplus
}
#endif
// declare qgl functions
#define QGLPROC(name, rettype, args) extern rettype (APIENTRYP q##name) args;
#include "renderer/qgl_proc.h"
// multitexture
extern void ( APIENTRY * qglMultiTexCoord2fARB )( GLenum texture, GLfloat s, GLfloat t );
extern void ( APIENTRY * qglMultiTexCoord2fvARB )( GLenum texture, GLfloat *st );
extern void ( APIENTRY * qglActiveTextureARB )( GLenum texture );
extern void ( APIENTRY * qglClientActiveTextureARB )( GLenum texture );
// ARB_vertex_buffer_object
extern PFNGLBINDBUFFERARBPROC qglBindBufferARB;
extern PFNGLDELETEBUFFERSARBPROC qglDeleteBuffersARB;
extern PFNGLGENBUFFERSARBPROC qglGenBuffersARB;
extern PFNGLISBUFFERARBPROC qglIsBufferARB;
extern PFNGLBUFFERDATAARBPROC qglBufferDataARB;
extern PFNGLBUFFERSUBDATAARBPROC qglBufferSubDataARB;
extern PFNGLGETBUFFERSUBDATAARBPROC qglGetBufferSubDataARB;
extern PFNGLMAPBUFFERARBPROC qglMapBufferARB;
extern PFNGLUNMAPBUFFERARBPROC qglUnmapBufferARB;
extern PFNGLGETBUFFERPARAMETERIVARBPROC qglGetBufferParameterivARB;
extern PFNGLGETBUFFERPOINTERVARBPROC qglGetBufferPointervARB;
// 3D textures
extern void ( APIENTRY *qglTexImage3D)(GLenum, GLint, GLint, GLsizei, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid *);
// shared texture palette
extern void ( APIENTRY *qglColorTableEXT)( int, int, int, int, int, const void * );
// EXT_stencil_two_side
extern PFNGLACTIVESTENCILFACEEXTPROC qglActiveStencilFaceEXT;
// DG: couldn't find any extension for this, it's supported in GL2.0 and newer, incl OpenGL ES2.0
// SE: work around missing function definition on legacy Mac OS X versions
#if defined(OSX_TIGER) || defined(OSX_LEOPARD)
typedef void (APIENTRYP PFNGLSTENCILOPSEPARATEPROC) (GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass);
#endif
extern PFNGLSTENCILOPSEPARATEPROC qglStencilOpSeparate;
// ARB_texture_compression
extern PFNGLCOMPRESSEDTEXIMAGE2DARBPROC qglCompressedTexImage2DARB;
extern PFNGLGETCOMPRESSEDTEXIMAGEARBPROC qglGetCompressedTexImageARB;
// ARB_texture_compression_bptc - uses ARB_texture_compression, just adds new constants
// that might be missing in old OpenGL headers
#ifndef GL_COMPRESSED_RGBA_BPTC_UNORM_ARB
// currently the only one we use, there's also COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB (0x8E8D)
// and COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB (0x8E8E) and COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB (0x8E8F)
#define GL_COMPRESSED_RGBA_BPTC_UNORM_ARB 0x8E8C
#endif
// ARB_vertex_program / ARB_fragment_program
extern PFNGLVERTEXATTRIBPOINTERARBPROC qglVertexAttribPointerARB;
extern PFNGLENABLEVERTEXATTRIBARRAYARBPROC qglEnableVertexAttribArrayARB;
extern PFNGLDISABLEVERTEXATTRIBARRAYARBPROC qglDisableVertexAttribArrayARB;
extern PFNGLPROGRAMSTRINGARBPROC qglProgramStringARB;
extern PFNGLBINDPROGRAMARBPROC qglBindProgramARB;
extern PFNGLGENPROGRAMSARBPROC qglGenProgramsARB;
extern PFNGLPROGRAMENVPARAMETER4FVARBPROC qglProgramEnvParameter4fvARB;
extern PFNGLPROGRAMLOCALPARAMETER4FVARBPROC qglProgramLocalParameter4fvARB;
// GL_EXT_depth_bounds_test
extern PFNGLDEPTHBOUNDSEXTPROC qglDepthBoundsEXT;
// GL_ARB_debug_output
extern PFNGLDEBUGMESSAGECALLBACKARBPROC qglDebugMessageCallbackARB;
#if defined( _WIN32 ) && defined(ID_ALLOW_TOOLS)
extern BOOL(WINAPI * qwglSwapBuffers)(HDC);
extern int Win_ChoosePixelFormat(HDC hdc);
extern BOOL(WINAPI * qwglCopyContext)(HGLRC, HGLRC, UINT);
extern HGLRC(WINAPI * qwglCreateContext)(HDC);
extern HGLRC(WINAPI * qwglCreateLayerContext)(HDC, int);
extern BOOL(WINAPI * qwglDeleteContext)(HGLRC);
extern HGLRC(WINAPI * qwglGetCurrentContext)(VOID);
extern HDC(WINAPI * qwglGetCurrentDC)(VOID);
extern PROC(WINAPI * qwglGetProcAddress)(LPCSTR);
extern BOOL(WINAPI * qwglMakeCurrent)(HDC, HGLRC);
extern BOOL(WINAPI * qwglShareLists)(HGLRC, HGLRC);
extern BOOL(WINAPI * qwglUseFontBitmaps)(HDC, DWORD, DWORD, DWORD);
extern BOOL(WINAPI * qwglUseFontOutlines)(HDC, DWORD, DWORD, DWORD, FLOAT,
FLOAT, int, LPGLYPHMETRICSFLOAT);
extern BOOL(WINAPI * qwglDescribeLayerPlane)(HDC, int, int, UINT,
LPLAYERPLANEDESCRIPTOR);
extern int (WINAPI * qwglSetLayerPaletteEntries)(HDC, int, int, int,
CONST COLORREF *);
extern int (WINAPI * qwglGetLayerPaletteEntries)(HDC, int, int, int,
COLORREF *);
extern BOOL(WINAPI * qwglRealizeLayerPalette)(HDC, int, BOOL);
extern BOOL(WINAPI * qwglSwapLayerBuffers)(HDC, UINT);
#endif // _WIN32 && ID_ALLOW_TOOLS
#endif
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