1/*
2 * File: glwrap.c
3 * Purpose: Wrapper functions for Win32 OpenGL functions
4 *
5 * Authors: Alexander Gottwald
6 *          Jon TURNEY
7 *
8 * Copyright (c) Jon TURNEY 2009
9 * Copyright (c) Alexander Gottwald 2004
10 *
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
18 *
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28 * DEALINGS IN THE SOFTWARE.
29 */
30
31// define USE_OPENGL32 makes gl.h declare gl*() function prototypes with stdcall linkage,
32// so our generated wrappers will correctly link with the functions in opengl32.dll
33#define USE_OPENGL32
34
35#ifdef HAVE_XWIN_CONFIG_H
36#include <xwin-config.h>
37#endif
38
39#include <X11/Xwindows.h>
40#include <GL/gl.h>
41#include <GL/glext.h>
42#include <glx/glxserver.h>
43#include <glx/glxext.h>
44#include <glx/glapi.h>
45#include <glx/dispatch.h>
46#include <glwindows.h>
47
48static unsigned int glWinIndirectProcCalls = 0;
49static unsigned int glWinDirectProcCalls = 0;
50
51void
52glWinCallDelta(void)
53{
54  static unsigned int glWinIndirectProcCallsLast = 0;
55  static unsigned int glWinDirectProcCallsLast = 0;
56  if ((glWinIndirectProcCalls != glWinIndirectProcCallsLast) ||
57      (glWinDirectProcCalls != glWinDirectProcCallsLast))
58    {
59      if (glxWinDebugSettings.enableTrace)
60        {
61          ErrorF("after %d direct and %d indirect GL calls\n",
62                 glWinDirectProcCalls - glWinDirectProcCallsLast,
63                 glWinIndirectProcCalls - glWinIndirectProcCallsLast);
64        }
65      glWinDirectProcCallsLast = glWinDirectProcCalls;
66      glWinIndirectProcCallsLast = glWinIndirectProcCalls;
67    }
68}
69
70static PROC
71glWinResolveHelper(PROC *cache, char *symbol)
72{
73  PROC proc = NULL;
74
75  /* If not yet cached, call wglGetProcAddress */
76  if ((*cache) == NULL)
77    {
78      proc = wglGetProcAddress(symbol);
79      if (proc == NULL)
80        {
81          ErrorF("glwrap: Can't resolve \"%s\"\n", symbol);
82          (*cache) = (PROC)-1;
83        }
84      else
85        {
86          ErrorF("glwrap: Resolved \"%s\"\n", symbol);
87          (*cache) = proc;
88        }
89    }
90  /* Cached wglGetProcAddress failure */
91  else if ((*cache) == (PROC)-1)
92    {
93      proc = 0;
94    }
95  /* Cached wglGetProcAddress result */
96  else
97    {
98      proc = (*cache);
99    }
100
101  return proc;
102}
103
104#define RESOLVE_RET(proctype, symbol, retval) \
105    static PROC cache = NULL; \
106    __stdcall proctype proc = (proctype)glWinResolveHelper(&cache, symbol); \
107    if (proc == NULL) { \
108        __glXErrorCallBack(0); \
109        return retval; \
110    } \
111    glWinIndirectProcCalls++;
112
113#define RESOLVE(proctype, symbol) RESOLVE_RET(proctype, symbol,)
114
115#define RESOLVED_PROC(proctype) proc
116
117/*
118  Include generated cdecl wrappers for stdcall gl*() functions in opengl32.dll
119
120  OpenGL 1.2 and upward is treated as extensions, function address must
121  found using wglGetProcAddress(), but also stdcall so still need wrappers...
122
123  Include generated dispatch table setup function
124*/
125
126#include "generated_gl_wrappers.c"
127
128/*
129  Special non-static wrapper for glGetString for debug output
130*/
131
132const GLubyte* glGetStringWrapperNonstatic(GLenum name)
133{
134  return glGetString(name);
135}
136
137/*
138  Special non-static wrapper for glAddSwapHintRectWIN for copySubBuffers
139*/
140
141typedef void (__stdcall *PFNGLADDSWAPHINTRECTWIN)(GLint x, GLint y, GLsizei width, GLsizei height);
142
143void glAddSwapHintRectWINWrapperNonstatic(GLint x, GLint y, GLsizei width, GLsizei height)
144{
145  RESOLVE(PFNGLADDSWAPHINTRECTWIN, "glAddSwapHintRectWIN");
146  proc(x, y, width, height);
147}
148
149