xserver

xserver with xephyr scale patch
git clone https://git.neptards.moe/u3shit/xserver.git
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glshim.c (3952B)

      1 /*
      2  * File: glshim.c
      3  * Purpose: GL shim which redirects to a specified DLL
      4  *
      5  * Copyright (c) Jon TURNEY 2013
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a
      8  * copy of this software and associated documentation files (the "Software"),
      9  * to deal in the Software without restriction, including without limitation
     10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     11  * and/or sell copies of the Software, and to permit persons to whom the
     12  * Software is furnished to do so, subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice shall be included in
     15  * all copies or substantial portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     20  * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     23  * DEALINGS IN THE SOFTWARE.
     24  */
     25 
     26 /*
     27    A GL shim which redirects to a specified DLL
     28 
     29    XWin is statically linked with this, rather than the system libGL, so that
     30    GL calls can be directed to mesa cygGL-1.dll, or cygnativeGLthunk.dll
     31    (which contains cdecl-to-stdcall thunks to the native openGL32.dll)
     32 */
     33 
     34 #ifdef HAVE_XWIN_CONFIG_H
     35 #include <xwin-config.h>
     36 #endif
     37 
     38 #define GL_GLEXT_LEGACY
     39 #define GL_GLEXT_PROTOTYPES
     40 #include <GL/gl.h>
     41 #undef GL_ARB_imaging
     42 #undef GL_VERSION_1_3
     43 #include <GL/glext.h>
     44 
     45 #include <X11/Xwindows.h>
     46 #include <os.h>
     47 #include "glwindows.h"
     48 #include <glx/glxserver.h>
     49 
     50 extern void *glXGetProcAddressARB(const char *);
     51 
     52 static HMODULE hMod = NULL;
     53 
     54 /*
     55   Implement the __glGetProcAddress function by just using GetProcAddress() on the selected DLL
     56 */
     57 void *glXGetProcAddressARB(const char *symbol)
     58 {
     59     void *proc;
     60 
     61     /* Default to the mesa GL implementation if one hasn't been selected yet */
     62     if (!hMod)
     63         glWinSelectImplementation(0);
     64 
     65     proc = GetProcAddress(hMod, symbol);
     66 
     67     if (glxWinDebugSettings.enableGLcallTrace)
     68         ErrorF("glXGetProcAddressARB: Resolved '%s' in %p to %p\n", symbol, hMod, proc);
     69 
     70     return proc;
     71 }
     72 
     73 /*
     74   Select a GL implementation DLL
     75 */
     76 int glWinSelectImplementation(int native)
     77 {
     78     const char *dllname;
     79 
     80     if (native) {
     81         dllname = "cygnativeGLthunk.dll";
     82     }
     83     else {
     84         dllname = "cygGL-1.dll";
     85     }
     86 
     87     hMod = LoadLibraryEx(dllname, NULL, 0);
     88     if (hMod == NULL) {
     89         ErrorF("glWinSelectGLimplementation: Could not load '%s'\n", dllname);
     90         return -1;
     91     }
     92 
     93     ErrorF("glWinSelectGLimplementation: Loaded '%s'\n", dllname);
     94 
     95     /* Connect __glGetProcAddress() to our implementation of glXGetProcAddressARB() above */
     96     __glXsetGetProcAddress((glx_gpa_proc)glXGetProcAddressARB);
     97 
     98     return 0;
     99 }
    100 
    101 #define RESOLVE_RET(proctype, symbol, retval) \
    102     proctype proc = (proctype)glXGetProcAddressARB(symbol);   \
    103     if (proc == NULL) return retval;
    104 
    105 #define RESOLVE(proctype, symbol) RESOLVE_RET(proctype, symbol,)
    106 #define RESOLVED_PROC proc
    107 
    108 /* Include generated shims for direct linkage to GL functions which are in the ABI */
    109 #include "generated_gl_shim.ic"
    110 
    111 /*
    112   Special wrapper for glAddSwapHintRectWIN for copySubBuffers
    113 
    114   Only used with native GL if the GL_WIN_swap_hint extension is present, so we enable
    115   GLX_MESA_copy_sub_buffer
    116 */
    117 typedef void (__stdcall * PFNGLADDSWAPHINTRECTWIN) (GLint x, GLint y,
    118                                                     GLsizei width,
    119                                                     GLsizei height);
    120 
    121 void
    122 glAddSwapHintRectWINWrapper(GLint x, GLint y, GLsizei width,
    123                             GLsizei height)
    124 {
    125     RESOLVE(PFNGLADDSWAPHINTRECTWIN, "glAddSwapHintRectWIN");
    126     RESOLVED_PROC(x, y, width, height);
    127 }