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source: vbox/trunk/src/VBox/GuestHost/OpenGL/spu_loader/choosevisual.c@ 20961

Last change on this file since 20961 was 15532, checked in by vboxsync, 16 years ago

crOpenGL: export to OSE
  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 7.6 KB
Line 
1
2#include "chromium.h"
3#include "cr_spu.h"
4#include "cr_error.h"
5#include "cr_string.h"
6
7
8/**
9 * Wrappers for glXChooseVisual/etc.
10 *
11 * By using this function, the fake GLX, render SPU, tilesort SPU,
12 * etc can be assured of getting the same GLX visual for a set of CR_*_BIT
13 * visual flags. This helps ensure that render_to_app_window will work
14 * properly.
15 */
16
17
18#if defined(WINDOWS)
19int
20crChooseVisual(const crOpenGLInterface *ws, int visBits)
21{
22 /* placeholder */
23 return 0;
24}
25#endif
26
27
28#if defined(DARWIN)
29int
30crChooseVisual(const crOpenGLInterface *ws, int visBits)
31{
32 /* placeholder */
33 return 0;
34}
35#endif
36
37
38#if defined(GLX)
39
40XVisualInfo *
41crChooseVisual(const crOpenGLInterface *ws, Display *dpy, int screen,
42 GLboolean directColor, int visBits)
43{
44 XVisualInfo *vis;
45 int errorBase, eventBase;
46
47 if (ws->glXQueryExtension(dpy, &errorBase, &eventBase))
48 {
49
50 if (ws->glXChooseVisual)
51 {
52 /* Use the real OpenGL's glXChooseVisual function */
53 int attribList[100];
54 int i = 0;
55
56 /* Build the attribute list */
57 if (visBits & CR_RGB_BIT)
58 {
59 attribList[i++] = GLX_RGBA;
60 attribList[i++] = GLX_RED_SIZE;
61 attribList[i++] = 1;
62 attribList[i++] = GLX_GREEN_SIZE;
63 attribList[i++] = 1;
64 attribList[i++] = GLX_BLUE_SIZE;
65 attribList[i++] = 1;
66 }
67
68 if (visBits & CR_ALPHA_BIT)
69 {
70 attribList[i++] = GLX_ALPHA_SIZE;
71 attribList[i++] = 1;
72 }
73
74 if (visBits & CR_DOUBLE_BIT)
75 {
76 attribList[i++] = GLX_DOUBLEBUFFER;
77 }
78
79 if (visBits & CR_STEREO_BIT)
80 {
81 attribList[i++] = GLX_STEREO;
82 }
83
84 if (visBits & CR_DEPTH_BIT)
85 {
86 attribList[i++] = GLX_DEPTH_SIZE;
87 attribList[i++] = 1;
88 }
89
90 if (visBits & CR_STENCIL_BIT)
91 {
92 attribList[i++] = GLX_STENCIL_SIZE;
93 attribList[i++] = 1;
94 }
95
96 if (visBits & CR_ACCUM_BIT)
97 {
98 attribList[i++] = GLX_ACCUM_RED_SIZE;
99 attribList[i++] = 1;
100 attribList[i++] = GLX_ACCUM_GREEN_SIZE;
101 attribList[i++] = 1;
102 attribList[i++] = GLX_ACCUM_BLUE_SIZE;
103 attribList[i++] = 1;
104 if (visBits & CR_ALPHA_BIT)
105 {
106 attribList[i++] = GLX_ACCUM_ALPHA_SIZE;
107 attribList[i++] = 1;
108 }
109 }
110
111 if (visBits & CR_MULTISAMPLE_BIT)
112 {
113 attribList[i++] = GLX_SAMPLE_BUFFERS_SGIS;
114 attribList[i++] = 1;
115 attribList[i++] = GLX_SAMPLES_SGIS;
116 attribList[i++] = 4;
117 }
118
119 if (visBits & CR_OVERLAY_BIT)
120 {
121 attribList[i++] = GLX_LEVEL;
122 attribList[i++] = 1;
123 }
124
125 if (directColor)
126 {
127 /*
128 * See if we have have GLX_EXT_visual_info so we
129 * can grab a Direct Color visual
130 */
131#ifdef GLX_EXT_visual_info
132 if (crStrstr(ws->glXQueryExtensionsString(dpy, screen),
133 "GLX_EXT_visual_info"))
134 {
135 attribList[i++] = GLX_X_VISUAL_TYPE_EXT;
136 attribList[i++] = GLX_DIRECT_COLOR_EXT;
137 }
138#endif
139 }
140
141 /* End the list */
142 attribList[i++] = None;
143
144 vis = ws->glXChooseVisual(dpy, screen, attribList);
145 return vis;
146 }
147 else
148 {
149 /* Don't use glXChooseVisual, use glXGetConfig.
150 *
151 * Here's the deal:
152 * Some (all?) versions of the libGL.so that's shipped with ATI's
153 * drivers aren't built with the -Bsymbolic flag. That's bad.
154 *
155 * If we call the glXChooseVisual() function that's built into ATI's
156 * libGL, it in turn calls the glXGetConfig() function. Now, there's
157 * a glXGetConfig function in libGL.so **AND** there's a glXGetConfig
158 * function in Chromium's libcrfaker.so library. Unfortunately, the
159 * later one gets called instead of the former. At this point, things
160 * go haywire. If -Bsymbolic were used, this would not happen.
161 */
162 XVisualInfo templateVis;
163 long templateFlags;
164 int count, i, visType;
165
166 visType = directColor ? DirectColor : TrueColor;
167
168 /* Get list of candidate visuals */
169 templateFlags = VisualScreenMask | VisualClassMask;
170 templateVis.screen = screen;
171#if defined(__cplusplus) || defined(c_plusplus)
172 templateVis.c_class = visType;
173#else
174 templateVis.class = visType;
175#endif
176
177 vis = XGetVisualInfo(dpy, templateFlags, &templateVis, &count);
178 /* find first visual that's good enough */
179 for (i = 0; i < count; i++)
180 {
181 int val;
182
183 /* Need exact match on RGB, DOUBLEBUFFER, STEREO, LEVEL, MULTISAMPLE */
184 ws->glXGetConfig(dpy, vis + i, GLX_RGBA, &val);
185 if (((visBits & CR_RGB_BIT) && !val) ||
186 (((visBits & CR_RGB_BIT) == 0) && val))
187 {
188 continue;
189 }
190
191 ws->glXGetConfig(dpy, vis + i, GLX_DOUBLEBUFFER, &val);
192 if (((visBits & CR_DOUBLE_BIT) && !val) ||
193 (((visBits & CR_DOUBLE_BIT) == 0) && val))
194 {
195 continue;
196 }
197
198 ws->glXGetConfig(dpy, vis + i, GLX_STEREO, &val);
199 if (((visBits & CR_STEREO_BIT) && !val) ||
200 (((visBits & CR_STEREO_BIT) == 0) && val))
201 {
202 continue;
203 }
204
205 ws->glXGetConfig(dpy, vis + i, GLX_LEVEL, &val);
206 if (((visBits & CR_OVERLAY_BIT) && !val) ||
207 (((visBits & CR_OVERLAY_BIT) == 0) && val))
208 {
209 continue;
210 }
211
212 ws->glXGetConfig(dpy, vis + i, GLX_SAMPLE_BUFFERS_SGIS, &val);
213 if (visBits & CR_MULTISAMPLE_BIT)
214 {
215 if (!val)
216 continue;
217 ws->glXGetConfig(dpy, vis + i, GLX_SAMPLES_SGIS, &val);
218 if (val < 4)
219 continue;
220 }
221 else {
222 /* don't want multisample */
223 if (val)
224 continue;
225 }
226
227 /* Need good enough for ALPHA, DEPTH, STENCIL, ACCUM */
228 if (visBits & CR_ALPHA_BIT)
229 {
230 ws->glXGetConfig(dpy, vis + i, GLX_ALPHA_SIZE, &val);
231 if (!val)
232 continue;
233 }
234
235 if (visBits & CR_DEPTH_BIT)
236 {
237 ws->glXGetConfig(dpy, vis + i, GLX_DEPTH_SIZE, &val);
238 if (!val)
239 continue;
240 }
241
242 if (visBits & CR_STENCIL_BIT)
243 {
244 ws->glXGetConfig(dpy, vis + i, GLX_STENCIL_SIZE, &val);
245 if (!val)
246 continue;
247 }
248
249 if (visBits & CR_ACCUM_BIT)
250 {
251 ws->glXGetConfig(dpy, vis + i, GLX_ACCUM_RED_SIZE, &val);
252 if (!val)
253 continue;
254 if (visBits & CR_ALPHA_BIT)
255 {
256 ws->glXGetConfig(dpy, vis + i, GLX_ACCUM_ALPHA_SIZE, &val);
257 if (!val)
258 continue;
259 }
260 }
261
262 /* If we get here, we found a good visual.
263 * Now, we need to get a new XVisualInfo pointer in case the caller
264 * calls XFree on it.
265 */
266 templateFlags = VisualScreenMask | VisualIDMask;
267 templateVis.screen = screen;
268 templateVis.visualid = vis[i].visual->visualid;
269 XFree(vis); /* free the list */
270 vis = XGetVisualInfo(dpy, templateFlags, &templateVis, &count);
271 return vis;
272 }
273
274 /* if we get here, we failed to find a sufficient visual */
275 return NULL;
276 }
277 }
278 else
279 {
280 /* use Xlib instead of GLX */
281 XVisualInfo templateVis, *best;
282 long templateFlags;
283 int i, count, visType;
284
285 if (visBits & CR_RGB_BIT)
286 visType = directColor ? DirectColor : TrueColor;
287 else
288 visType = PseudoColor;
289
290 /* Get list of candidate visuals */
291 templateFlags = VisualScreenMask | VisualClassMask;
292 templateVis.screen = screen;
293#if defined(__cplusplus) || defined(c_plusplus)
294 templateVis.c_class = visType;
295#else
296 templateVis.class = visType;
297#endif
298
299 vis = XGetVisualInfo(dpy, templateFlags, &templateVis, &count);
300 if (!vis)
301 return NULL;
302
303 /* okay, select the RGB visual with the most depth */
304 best = vis + 0;
305 for (i = 1; i < count; i++)
306 {
307 if (vis[i].depth > best->depth &&
308 vis[i].bits_per_rgb > best->bits_per_rgb )
309 best = vis + i;
310 }
311
312 if (best)
313 {
314 /* If we get here, we found a good visual.
315 * Now, we need to get a new XVisualInfo pointer in case the caller
316 * calls XFree on it.
317 */
318 templateFlags = VisualScreenMask | VisualIDMask;
319 templateVis.screen = screen;
320 templateVis.visualid = best->visualid;
321 XFree(vis); /* free the list */
322 best = XGetVisualInfo(dpy, templateFlags, &templateVis, &count);
323 }
324
325 return best;
326 }
327}
328
329#endif /* GLX */
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