128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* File: glshim.c
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* Purpose: GL shim which redirects to a specified DLL
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*
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* Copyright (c) Jon TURNEY 2013
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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A GL shim which redirects to a specified DLL
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XWin is statically linked with this, rather than the system libGL, so that
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GL calls can be directed to mesa cygGL-1.dll, or cygnativeGLthunk.dll
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(which contains cdecl-to-stdcall thunks to the native openGL32.dll)
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*/
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#ifdef HAVE_XWIN_CONFIG_H
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#include <xwin-config.h>
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#endif
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#define GL_GLEXT_LEGACY
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#define GL_GLEXT_PROTOTYPES
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#include <GL/gl.h>
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#undef GL_ARB_imaging
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#undef GL_VERSION_1_3
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#include <GL/glext.h>
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#include <X11/Xwindows.h>
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#include <os.h>
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#include "glwindows.h"
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#include <glx/glxserver.h>
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extern void *glXGetProcAddressARB(const char *);
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static HMODULE hMod = NULL;
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/*
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Implement the __glGetProcAddress function by just using GetProcAddress() on the selected DLL
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*/
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void *glXGetProcAddressARB(const char *symbol)
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{
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void *proc;
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/* Default to the mesa GL implementation if one hasn't been selected yet */
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if (!hMod)
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glWinSelectImplementation(0);
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proc = GetProcAddress(hMod, symbol);
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if (glxWinDebugSettings.enableGLcallTrace)
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ErrorF("glXGetProcAddressARB: Resolved '%s' in %p to %p\n", symbol, hMod, proc);
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return proc;
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}
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/*
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Select a GL implementation DLL
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*/
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int glWinSelectImplementation(int native)
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{
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const char *dllname;
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if (native) {
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dllname = "cygnativeGLthunk.dll";
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}
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else {
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dllname = "cygGL-1.dll";
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}
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hMod = LoadLibraryEx(dllname, NULL, 0);
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if (hMod == NULL) {
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ErrorF("glWinSelectGLimplementation: Could not load '%s'\n", dllname);
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return -1;
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}
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ErrorF("glWinSelectGLimplementation: Loaded '%s'\n", dllname);
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/* Connect __glGetProcAddress() to our implementation of glXGetProcAddressARB() above */
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__glXsetGetProcAddress((glx_gpa_proc)glXGetProcAddressARB);
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return 0;
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}
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#define RESOLVE_RET(proctype, symbol, retval) \
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proctype proc = (proctype)glXGetProcAddressARB(symbol); \
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if (proc == NULL) return retval;
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#define RESOLVE(proctype, symbol) RESOLVE_RET(proctype, symbol,)
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#define RESOLVED_PROC proc
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/* Include generated shims for direct linkage to GL functions which are in the ABI */
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#include "generated_gl_shim.c"
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/*
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Special wrapper for glAddSwapHintRectWIN for copySubBuffers
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Only used with native GL if the GL_WIN_swap_hint extension is present, so we enable
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GLX_MESA_copy_sub_buffer
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*/
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typedef void (__stdcall * PFNGLADDSWAPHINTRECTWIN) (GLint x, GLint y,
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GLsizei width,
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GLsizei height);
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void
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glAddSwapHintRectWINWrapper(GLint x, GLint y, GLsizei width,
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GLsizei height)
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{
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RESOLVE(PFNGLADDSWAPHINTRECTWIN, "glAddSwapHintRectWIN");
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RESOLVED_PROC(x, y, width, height);
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}
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