|
0
|
1 /*
|
|
|
2 SDL - Simple DirectMedia Layer
|
|
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
|
|
|
4
|
|
|
5 This library is free software; you can redistribute it and/or
|
|
|
6 modify it under the terms of the GNU Library General Public
|
|
|
7 License as published by the Free Software Foundation; either
|
|
|
8 version 2 of the License, or (at your option) any later version.
|
|
|
9
|
|
|
10 This library is distributed in the hope that it will be useful,
|
|
|
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
13 Library General Public License for more details.
|
|
|
14
|
|
|
15 You should have received a copy of the GNU Library General Public
|
|
|
16 License along with this library; if not, write to the Free
|
|
|
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
18
|
|
|
19 Sam Lantinga
|
|
|
20 slouken@devolution.com
|
|
|
21 */
|
|
|
22
|
|
|
23 #ifdef SAVE_RCSID
|
|
|
24 static char rcsid =
|
|
|
25 "@(#) $Id$";
|
|
|
26 #endif
|
|
|
27
|
|
|
28 /* WGL implementation of SDL OpenGL support */
|
|
|
29
|
|
|
30 #include <windows.h>
|
|
|
31
|
|
|
32 #include "SDL_error.h"
|
|
|
33 #include "SDL_lowvideo.h"
|
|
|
34 #include "SDL_wingl_c.h"
|
|
|
35
|
|
|
36 #ifdef HAVE_OPENGL
|
|
|
37 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL"
|
|
|
38 #endif
|
|
|
39
|
|
|
40
|
|
|
41 int WIN_GL_SetupWindow(_THIS)
|
|
|
42 {
|
|
|
43 int retval;
|
|
|
44 #ifdef HAVE_OPENGL
|
|
|
45 int pixel_format;
|
|
|
46
|
|
|
47 /* load the gl driver from a default path */
|
|
|
48 if ( ! this->gl_config.driver_loaded ) {
|
|
|
49 /* no driver has been loaded, use default (ourselves) */
|
|
|
50 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) {
|
|
|
51 return(-1);
|
|
|
52 }
|
|
|
53 }
|
|
|
54
|
|
|
55 /* Get the window device context for our OpenGL drawing */
|
|
|
56 GL_hdc = GetDC(SDL_Window);
|
|
|
57 if ( GL_hdc == NULL ) {
|
|
|
58 SDL_SetError("Unable to get DC for SDL_Window");
|
|
|
59 return(-1);
|
|
|
60 }
|
|
|
61
|
|
|
62 /* Set up the pixel format descriptor with our needed format */
|
|
|
63 memset(&GL_pfd, 0, sizeof(GL_pfd));
|
|
|
64 GL_pfd.nSize = sizeof(GL_pfd);
|
|
|
65 GL_pfd.nVersion = 1;
|
|
|
66 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL);
|
|
|
67 if ( this->gl_config.double_buffer ) {
|
|
|
68 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER;
|
|
|
69 }
|
|
|
70 GL_pfd.iPixelType = PFD_TYPE_RGBA;
|
|
|
71 GL_pfd.cColorBits = this->gl_config.buffer_size;
|
|
|
72 GL_pfd.cRedBits = this->gl_config.red_size;
|
|
|
73 GL_pfd.cGreenBits = this->gl_config.green_size;
|
|
|
74 GL_pfd.cBlueBits = this->gl_config.blue_size;
|
|
|
75 GL_pfd.cAlphaBits = this->gl_config.alpha_size;
|
|
|
76 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size;
|
|
|
77 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size;
|
|
|
78 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size;
|
|
|
79 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size;
|
|
|
80 GL_pfd.cAccumBits =
|
|
|
81 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits +
|
|
|
82 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits);
|
|
|
83 GL_pfd.cDepthBits = this->gl_config.depth_size;
|
|
|
84 GL_pfd.cStencilBits = this->gl_config.stencil_size;
|
|
|
85
|
|
|
86 /* Choose and set the closest available pixel format */
|
|
|
87 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd);
|
|
|
88 if ( !pixel_format ) {
|
|
|
89 SDL_SetError("No matching GL pixel format available");
|
|
|
90 return(-1);
|
|
|
91 }
|
|
|
92 if( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) {
|
|
|
93 SDL_SetError("Unable to set HDC pixel format");
|
|
|
94 return(-1);
|
|
|
95 }
|
|
|
96 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd);
|
|
|
97
|
|
|
98 GL_hrc = this->gl_data->wglCreateContext(GL_hdc);
|
|
|
99 if( GL_hrc == NULL ) {
|
|
|
100 SDL_SetError("Unable to create GL context");
|
|
|
101 return(-1);
|
|
|
102 }
|
|
|
103 gl_active = 1;
|
|
|
104 #else
|
|
|
105 SDL_SetError("WIN driver not configured with OpenGL");
|
|
|
106 #endif
|
|
|
107 if ( gl_active ) {
|
|
|
108 retval = 0;
|
|
|
109 } else {
|
|
|
110 retval = -1;
|
|
|
111 }
|
|
|
112 return(retval);
|
|
|
113 }
|
|
|
114
|
|
|
115 void WIN_GL_ShutDown(_THIS)
|
|
|
116 {
|
|
|
117 #ifdef HAVE_OPENGL
|
|
|
118 /* Clean up OpenGL */
|
|
|
119 if ( GL_hrc ) {
|
|
|
120 this->gl_data->wglMakeCurrent(NULL, NULL);
|
|
|
121 this->gl_data->wglDeleteContext(GL_hrc);
|
|
|
122 GL_hrc = NULL;
|
|
|
123 }
|
|
|
124 if ( GL_hdc ) {
|
|
|
125 ReleaseDC(SDL_Window, GL_hdc);
|
|
|
126 GL_hdc = NULL;
|
|
|
127 }
|
|
|
128 gl_active = 0;
|
|
|
129
|
|
|
130 WIN_GL_UnloadLibrary(this);
|
|
|
131 #endif /* HAVE_OPENGL */
|
|
|
132 }
|
|
|
133
|
|
|
134 #ifdef HAVE_OPENGL
|
|
|
135
|
|
|
136 /* Make the current context active */
|
|
|
137 int WIN_GL_MakeCurrent(_THIS)
|
|
|
138 {
|
|
|
139 int retval;
|
|
|
140
|
|
|
141 retval = 0;
|
|
|
142 if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) {
|
|
|
143 SDL_SetError("Unable to make GL context current");
|
|
|
144 retval = -1;
|
|
|
145 }
|
|
|
146 return(retval);
|
|
|
147 }
|
|
|
148
|
|
|
149 /* Get attribute data from glX. */
|
|
|
150 int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
|
|
|
151 {
|
|
|
152 int retval;
|
|
|
153
|
|
|
154 retval = 0;
|
|
|
155 switch( attrib ) {
|
|
|
156 case SDL_GL_RED_SIZE:
|
|
|
157 *value = GL_pfd.cRedBits;
|
|
|
158 break;
|
|
|
159 case SDL_GL_GREEN_SIZE:
|
|
|
160 *value = GL_pfd.cGreenBits;
|
|
|
161 break;
|
|
|
162 case SDL_GL_BLUE_SIZE:
|
|
|
163 *value = GL_pfd.cBlueBits;
|
|
|
164 break;
|
|
|
165 case SDL_GL_ALPHA_SIZE:
|
|
|
166 *value = GL_pfd.cAlphaBits;
|
|
|
167 break;
|
|
|
168 case SDL_GL_DOUBLEBUFFER:
|
|
|
169 if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) {
|
|
|
170 *value = 1;
|
|
|
171 } else {
|
|
|
172 *value = 0;
|
|
|
173 }
|
|
|
174 break;
|
|
|
175 case SDL_GL_BUFFER_SIZE:
|
|
|
176 *value = GL_pfd.cColorBits;
|
|
|
177 break;
|
|
|
178 case SDL_GL_DEPTH_SIZE:
|
|
|
179 *value = GL_pfd.cDepthBits;
|
|
|
180 break;
|
|
|
181 case SDL_GL_STENCIL_SIZE:
|
|
|
182 *value = GL_pfd.cStencilBits;
|
|
|
183 break;
|
|
|
184 case SDL_GL_ACCUM_RED_SIZE:
|
|
|
185 *value = GL_pfd.cAccumRedBits;
|
|
|
186 break;
|
|
|
187 case SDL_GL_ACCUM_GREEN_SIZE:
|
|
|
188 *value = GL_pfd.cAccumGreenBits;
|
|
|
189 break;
|
|
|
190 case SDL_GL_ACCUM_BLUE_SIZE:
|
|
|
191 *value = GL_pfd.cAccumBlueBits;
|
|
|
192 break;
|
|
|
193 case SDL_GL_ACCUM_ALPHA_SIZE:
|
|
|
194 *value = GL_pfd.cAccumAlphaBits;
|
|
|
195 break;
|
|
|
196 default:
|
|
|
197 retval = -1;
|
|
|
198 break;
|
|
|
199 }
|
|
|
200 return retval;
|
|
|
201 }
|
|
|
202
|
|
|
203 void WIN_GL_SwapBuffers(_THIS)
|
|
|
204 {
|
|
|
205 SwapBuffers(GL_hdc);
|
|
|
206 }
|
|
|
207
|
|
|
208 #endif /* HAVE_OPENGL */
|
|
|
209
|
|
|
210 #ifdef HAVE_OPENGL
|
|
|
211
|
|
|
212 void WIN_GL_UnloadLibrary(_THIS)
|
|
|
213 {
|
|
|
214 if ( this->gl_config.driver_loaded ) {
|
|
|
215 FreeLibrary((HMODULE)this->gl_config.dll_handle);
|
|
|
216
|
|
|
217 this->gl_data->wglGetProcAddress = NULL;
|
|
|
218 this->gl_data->wglCreateContext = NULL;
|
|
|
219 this->gl_data->wglDeleteContext = NULL;
|
|
|
220 this->gl_data->wglMakeCurrent = NULL;
|
|
|
221
|
|
|
222 this->gl_config.dll_handle = NULL;
|
|
|
223 this->gl_config.driver_loaded = 0;
|
|
|
224 }
|
|
|
225 }
|
|
|
226
|
|
|
227 /* Passing a NULL path means load pointers from the application */
|
|
|
228 int WIN_GL_LoadLibrary(_THIS, const char* path)
|
|
|
229 {
|
|
|
230 HMODULE handle;
|
|
|
231
|
|
|
232 if ( gl_active ) {
|
|
|
233 SDL_SetError("OpenGL context already created");
|
|
|
234 return -1;
|
|
|
235 }
|
|
|
236
|
|
|
237 if ( path == NULL ) {
|
|
|
238 path = DEFAULT_GL_DRIVER_PATH;
|
|
|
239 }
|
|
|
240 handle = LoadLibrary(path);
|
|
|
241 if ( handle == NULL ) {
|
|
|
242 SDL_SetError("Could not load OpenGL library");
|
|
|
243 return -1;
|
|
|
244 }
|
|
|
245
|
|
|
246 /* Unload the old driver and reset the pointers */
|
|
|
247 WIN_GL_UnloadLibrary(this);
|
|
|
248
|
|
|
249 /* Load new function pointers */
|
|
|
250 this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *))
|
|
|
251 GetProcAddress(handle, "wglGetProcAddress");
|
|
|
252 this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC))
|
|
|
253 GetProcAddress(handle, "wglCreateContext");
|
|
|
254 this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC))
|
|
|
255 GetProcAddress(handle, "wglDeleteContext");
|
|
|
256 this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC))
|
|
|
257 GetProcAddress(handle, "wglMakeCurrent");
|
|
|
258
|
|
|
259 if ( (this->gl_data->wglGetProcAddress == NULL) ||
|
|
|
260 (this->gl_data->wglCreateContext == NULL) ||
|
|
|
261 (this->gl_data->wglDeleteContext == NULL) ||
|
|
|
262 (this->gl_data->wglMakeCurrent == NULL) ) {
|
|
|
263 SDL_SetError("Could not retrieve OpenGL functions");
|
|
|
264 FreeLibrary(handle);
|
|
|
265 return -1;
|
|
|
266 }
|
|
|
267
|
|
|
268 this->gl_config.dll_handle = handle;
|
|
|
269 strcpy(this->gl_config.driver_path, path);
|
|
|
270 this->gl_config.driver_loaded = 1;
|
|
|
271 return 0;
|
|
|
272 }
|
|
|
273
|
|
|
274 void *WIN_GL_GetProcAddress(_THIS, const char* proc)
|
|
|
275 {
|
|
|
276 void *func;
|
|
|
277
|
|
|
278 /* This is to pick up extensions */
|
|
|
279 func = this->gl_data->wglGetProcAddress(proc);
|
|
|
280 if ( ! func ) {
|
|
|
281 /* This is probably a normal GL function */
|
|
|
282 func = GetProcAddress(this->gl_config.dll_handle, proc);
|
|
|
283 }
|
|
|
284 return func;
|
|
|
285 }
|
|
|
286
|
|
|
287 #endif /* HAVE_OPENGL */
|
