source: trunk/src/gdi32/opengl.cpp@ 10374

Last change on this file since 10374 was 10374, checked in by sandervl, 22 years ago

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1/* $Id: opengl.cpp,v 1.10 2004-01-11 11:42:19 sandervl Exp $ */
2
3/*
4 * GDI32 OpenGl stubs
5 *
6 * Copyright 1998 Sander van Leeuwen (sandervl@xs4all.nl)
7 *
8 * Project Odin Software License can be found in LICENSE.TXT
9 *
10 */
11
12
13/****************************************************************************
14 * Includes *
15 ****************************************************************************/
16
17#include <os2win.h>
18#include <stdarg.h>
19#include <string.h>
20#include <odinwrap.h>
21#include "misc.h"
22#include "unicode.h"
23
24#define DBG_LOCALLOG DBG_opengl
25#include "dbglocal.h"
26
27
28ODINDEBUGCHANNEL(GDI32-OPENGL)
29
30
31/****************************************************************************
32 * Definitions *
33 ****************************************************************************/
34
35typedef int (* WIN32API CHOOSEPIXELFMT) (HDC, CONST PIXELFORMATDESCRIPTOR *);
36typedef BOOL (* WIN32API SETPIXELFMT) (HDC, int, CONST PIXELFORMATDESCRIPTOR *);
37typedef BOOL (* WIN32API SWAPBUFFERS) (HDC hdc);
38typedef int (* WIN32API DESCRIBEPIXELFMT) (HDC, int, UINT, LPPIXELFORMATDESCRIPTOR);
39typedef int (* WIN32API GETPIXELFMT) (HDC);
40
41
42/****************************************************************************
43 * Module Global Variables *
44 ****************************************************************************/
45
46static CHOOSEPIXELFMT glChoosePixelFormat = NULL;
47static SETPIXELFMT glSetPixelFormat = NULL;
48static SWAPBUFFERS glSwapBuffers = NULL;
49static DESCRIBEPIXELFMT glDescribePixelFormat = NULL;
50static GETPIXELFMT glGetPixelFormat = NULL;
51static HINSTANCE hOpenGL = NULL;
52
53
54/*****************************************************************************
55 * Name : internalOpenGLEnable
56 * Purpose : check if loaded, load OpenGL.DLL on demand
57 * Parameters:
58 * Variables :
59 * Result :
60 * Remark :
61 * Status :
62 *
63 * Author : Patrick Haller [Fri, 1998/02/27 11:55]
64 *****************************************************************************/
65
66static BOOL internalOpenGLEnable(void)
67{
68 if(hOpenGL == NULL)
69 {
70 hOpenGL = LoadLibraryA("OPENGL32.DLL");
71 if(hOpenGL == NULL)
72 return(FALSE);
73 }
74
75 if(glChoosePixelFormat == NULL) {
76 glChoosePixelFormat = (CHOOSEPIXELFMT)GetProcAddress(hOpenGL, "wglChoosePixelFormat");
77 if(glChoosePixelFormat == NULL)
78 return(0);
79 }
80
81 if(glSetPixelFormat == NULL) {
82 glSetPixelFormat = (SETPIXELFMT)GetProcAddress(hOpenGL, "wglSetPixelFormat");
83 if(glSetPixelFormat == NULL)
84 return(FALSE);
85 }
86
87 if(glSwapBuffers == NULL) {
88 glSwapBuffers = (SWAPBUFFERS)GetProcAddress(hOpenGL, "wglSwapBuffers");
89 if(glSwapBuffers == NULL)
90 return(FALSE);
91 }
92
93 if(glDescribePixelFormat == NULL) {
94 glDescribePixelFormat = (DESCRIBEPIXELFMT)GetProcAddress(hOpenGL, "wglDescribePixelFormat");
95 if(glDescribePixelFormat == NULL)
96 return(FALSE);
97 }
98
99 if(glGetPixelFormat == NULL) {
100 glGetPixelFormat = (GETPIXELFMT)GetProcAddress(hOpenGL, "wglGetPixelFormat");
101 if(glGetPixelFormat == NULL)
102 return(FALSE);
103 }
104
105 return(TRUE); /* OpenGL is initialized and enabled*/
106}
107
108
109/*****************************************************************************
110 * Name :
111 * Purpose :
112 * Parameters:
113 * Variables :
114 * Result :
115 * Remark :
116 * Status :
117 *
118 * Author : Patrick Haller [Fri, 1998/02/27 11:55]
119 *****************************************************************************/
120
121int WIN32API ChoosePixelFormat(HDC hdc, CONST PIXELFORMATDESCRIPTOR* pformat)
122{
123 if (glChoosePixelFormat == NULL)
124 if (internalOpenGLEnable() == FALSE)
125 return(0);
126
127 return(glChoosePixelFormat(hdc, pformat));
128}
129
130int WIN32API DescribePixelFormat(HDC hdc, int iFormat, UINT nBytes,
131 LPPIXELFORMATDESCRIPTOR pformat)
132{
133 if (glDescribePixelFormat == NULL)
134 if (internalOpenGLEnable() == FALSE)
135 return(0);
136
137 return(glDescribePixelFormat(hdc, iFormat, nBytes, pformat));
138}
139
140int WIN32API GetPixelFormat(HDC hdc)
141{
142 if (glGetPixelFormat == NULL)
143 if (internalOpenGLEnable() == FALSE)
144 return(0);
145
146 return(glGetPixelFormat(hdc));
147}
148
149/*****************************************************************************
150 * Name :
151 * Purpose :
152 * Parameters:
153 * Variables :
154 * Result :
155 * Remark :
156 * Status :
157 *
158 * Author : Patrick Haller [Fri, 1998/02/27 11:55]
159 *****************************************************************************/
160
161BOOL WIN32API SetPixelFormat(HDC hdc, int whatever,
162 CONST PIXELFORMATDESCRIPTOR *pformat)
163{
164 if (glSetPixelFormat == NULL)
165 if (internalOpenGLEnable() == FALSE)
166 return(0);
167
168 return(glSetPixelFormat(hdc, whatever, pformat));
169}
170
171
172/*****************************************************************************
173 * Name :
174 * Purpose :
175 * Parameters:
176 * Variables :
177 * Result :
178 * Remark :
179 * Status :
180 *
181 * Author : Patrick Haller [Fri, 1998/02/27 11:55]
182 *****************************************************************************/
183
184BOOL WIN32API SwapBuffers(HDC hdc)
185{
186 if (glSwapBuffers == NULL)
187 if (internalOpenGLEnable() == FALSE)
188 return(0);
189
190
191 return(glSwapBuffers(hdc));
192}
193
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