3265d0c81f
Somehow I'd managed to write this with this dependency missing, so this only works correctly when the generated files already exist and the correct automatic dependencies generated, but fails on a clean build. Including generated files with a .c extension into the sources for a target causes meson to want to compile them (and it seems to be hard to say "make the directory containing this generated file available to include"). So, change the extension of included generated C fragments to .ic Update the autotools build to align. Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
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.ic"
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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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