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