-int render_depth;
-XVisualInfo render_visual_info;
-
-Visual *render_visual;
-Colormap render_colormap;
-
-int render_red_offset = 0, render_green_offset = 0, render_blue_offset = 0;
-int render_red_shift, render_green_shift, render_blue_shift;
-int render_red_mask, render_green_mask, render_blue_mask;
-
-
-#ifdef USE_GL
-
-GLXContext render_glx_context;
-
-int render_glx_rating(XVisualInfo *v)
-{
- int er;
- int rating = 0;
- int val;
- printf("evaluating visual %d\n", v->visualid);
- glXGetConfig(ob_display, v, GLX_BUFFER_SIZE, &val);
- printf("buffer size %d\n", val);
-
- switch (val) {
- case 32:
- rating += 300;
- break;
- case 24:
- rating += 200;
- break;
- case 16:
- rating += 100;
- break;
- }
-
- glXGetConfig(ob_display, v, GLX_LEVEL, &val);
- printf("level %d\n", val);
- if (val != 0)
- rating = -10000;
-
- glXGetConfig(ob_display, v, GLX_DEPTH_SIZE, &val);
- printf("depth size %d\n", val);
- switch (val) {
- case 32:
- rating += 30;
- break;
- case 24:
- rating += 20;
- break;
- case 16:
- rating += 10;
- break;
- case 0:
- rating -= 10000;
- }
-
- glXGetConfig(ob_display, v, GLX_DOUBLEBUFFER, &val);
- printf("double buffer %d\n", val);
- if (val)
- rating++;
- return rating;
-}
-#endif /* USE_GL */
-
-void render_startup(void)
-{
- int count, i = 0, val, best = 0, rate = 0, temp;
- XVisualInfo vimatch, *vilist;
- paint = x_paint;
-
- render_depth = DefaultDepth(ob_display, ob_screen);
- render_visual = DefaultVisual(ob_display, ob_screen);
- render_colormap = DefaultColormap(ob_display, ob_screen);
-
-#ifdef USE_GL
- vimatch.screen = ob_screen;
- vimatch.class = TrueColor;
- vilist = XGetVisualInfo(ob_display, VisualScreenMask | VisualClassMask,
- &vimatch, &count);
-
- if (vilist) {
- printf("looking for a GL visualin %d visuals\n", count);
- for (i = 0; i < count; i++) {
- glXGetConfig(ob_display, &vilist[i], GLX_USE_GL, &val);
- if (val) {
- temp = render_glx_rating(&vilist[i]);
- if (temp > rate) {
- best = i;
- rate = temp;
- }
- }
- }
- }
- if (rate > 0) {
- printf("picked visual %d with rating %d\n", best, rate);
- render_depth = vilist[best].depth;
- render_visual = vilist[best].visual;
- render_colormap = XCreateColormap(ob_display, ob_root,
- render_visual, AllocNone);
- render_visual_info = vilist[best];
- render_glx_context = glXCreateContext(ob_display, &render_visual_info,
- NULL, True);
- if (render_glx_context == NULL)
- printf("sadness\n");
- else {
- paint = gl_paint;
- }
- }
-#endif /*USE_GL*/
-
-
- switch (render_visual->class) {
- case TrueColor:
- truecolor_startup();
- break;
- case PseudoColor:
- case StaticColor:
- case GrayScale:
- case StaticGray:
- pseudocolor_startup();
- break;
- default:
- g_critical("unsupported visual class.\n");
- exit(EXIT_FAILURE);
-
- }
-}
-
-void truecolor_startup(void)
-{
- unsigned long red_mask, green_mask, blue_mask;
- XImage *timage = NULL;
-
- timage = XCreateImage(ob_display, render_visual, render_depth,
- ZPixmap, 0, NULL, 1, 1, 32, 0);
- g_assert(timage != NULL);
- /* find the offsets for each color in the visual's masks */
- render_red_mask = red_mask = timage->red_mask;
- render_green_mask = green_mask = timage->green_mask;
- render_blue_mask = blue_mask = timage->blue_mask;
-
- render_red_offset = 0;
- render_green_offset = 0;
- render_blue_offset = 0;
-
- while (! (red_mask & 1)) { render_red_offset++; red_mask >>= 1; }
- while (! (green_mask & 1)) { render_green_offset++; green_mask >>= 1; }
- while (! (blue_mask & 1)) { render_blue_offset++; blue_mask >>= 1; }
-
- render_red_shift = render_green_shift = render_blue_shift = 8;
- while (red_mask) { red_mask >>= 1; render_red_shift--; }
- while (green_mask) { green_mask >>= 1; render_green_shift--; }
- while (blue_mask) { blue_mask >>= 1; render_blue_shift--; }
- XFree(timage);
-}