-static void
-set_2d_projection (int width, int height)
-{
- my_glMatrixMode (GL_PROJECTION);
- my_glLoadIdentity ();
- my_glOrtho (0, width, height, 0, 0, 1);
- my_glMatrixMode (GL_MODELVIEW);
-}
-
-static void
-paint_rgb_using_clear (double r, double g, double b)
-{
- my_glClearColor(r, g, b, 1.0);
- my_glClear(GL_COLOR_BUFFER_BIT);
-}
-
-static void
-draw (Display *dpy, Window window, int width, int height)
-{
- int i;
- int visual_attr[] = {
- GLX_RGBA,
- GLX_RED_SIZE, 8,
- GLX_GREEN_SIZE, 8,
- GLX_BLUE_SIZE, 8,
- GLX_ALPHA_SIZE, 8,
- GLX_DOUBLEBUFFER,
- GLX_DEPTH_SIZE, 24,
- GLX_STENCIL_SIZE, 8,
- GLX_X_VISUAL_TYPE, GLX_DIRECT_COLOR,
- None
- };
-
- /* Window and context setup. */
- XVisualInfo *visual_info = my_glXChooseVisual(dpy, 0, visual_attr);
- GLXContext ctx = my_glXCreateContext(dpy, visual_info, NULL, True);
- my_glXMakeCurrent(dpy, window, ctx);
-
- my_glViewport(0, 0, width, height);
-
- set_2d_projection (width, height);
-
-/* Simply count through some colors, frame by frame. */
-#define RGB(frame) (((frame+1)/4) % 2), (((frame+1)/2) % 2), ((frame+1) % 2)
-
- int frame = 0;
- for (i = 0; i < 2; i++) {
- /* Frame: Draw a solid (magenta) frame */
- paint_rgb_using_clear (RGB(frame));
- my_glXSwapBuffers (dpy, window);
- frame++;
-
- /* Frame: Draw a solid (yellow) frame */
- paint_rgb_using_clear (RGB(frame));
- my_glXSwapBuffers (dpy, window);
- frame++;
-
- /* Frame: Draw a solid (cyan) frame */
- paint_rgb_using_clear (RGB(frame));
- my_glXSwapBuffers (dpy, window);
- frame++;
- }
-
- /* Cleanup */
- my_glXDestroyContext (dpy, ctx);
-}
-
-static void
-handle_events(Display *dpy, Window window)
-{
- XEvent xev;
- int width = 0;
- int height = 0;
-
- XNextEvent (dpy, &xev);
-
- while (1) {
- XNextEvent (dpy, &xev);
- switch (xev.type) {
- case ConfigureNotify:
- width = xev.xconfigure.width;
- height = xev.xconfigure.height;
- break;
- case Expose:
- if (xev.xexpose.count == 0) {
- draw (dpy, window, width, height);
- return;
- }
- break;
- }
- }
-}