XVisualInfo *
X11_GL_GetVisual(_THIS, Display * display, int screen)
{
XVisualInfo *vinfo;
/* 64 seems nice. */
int attribs[64];
int i = 0;
/* Setup our GLX attributes according to the gl_config. */
attribs[i++] = GLX_RGBA;
attribs[i++] = GLX_RED_SIZE;
attribs[i++] = _this->gl_config.red_size;
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = _this->gl_config.green_size;
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = _this->gl_config.blue_size;
if (_this->gl_config.alpha_size) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = _this->gl_config.alpha_size;
}
if (_this->gl_config.buffer_size) {
attribs[i++] = GLX_BUFFER_SIZE;
attribs[i++] = _this->gl_config.buffer_size;
}
if (_this->gl_config.double_buffer) {
attribs[i++] = GLX_DOUBLEBUFFER;
}
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = _this->gl_config.depth_size;
if (_this->gl_config.stencil_size) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = _this->gl_config.stencil_size;
}
if (_this->gl_config.accum_red_size) {
attribs[i++] = GLX_ACCUM_RED_SIZE;
attribs[i++] = _this->gl_config.accum_red_size;
}
if (_this->gl_config.accum_green_size) {
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
attribs[i++] = _this->gl_config.accum_green_size;
}
if (_this->gl_config.accum_blue_size) {
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
attribs[i++] = _this->gl_config.accum_blue_size;
}
if (_this->gl_config.accum_alpha_size) {
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
attribs[i++] = _this->gl_config.accum_alpha_size;
}
if (_this->gl_config.stereo) {
attribs[i++] = GLX_STEREO;
}
if (_this->gl_config.multisamplebuffers) {
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
attribs[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attribs[i++] = GLX_SAMPLES_ARB;
attribs[i++] = _this->gl_config.multisamplesamples;
}
if (_this->gl_config.accelerated >= 0 &&
_this->gl_data->HAS_GLX_EXT_visual_rating) {
attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
GLX_SLOW_VISUAL_EXT;
}
#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
if (X11_UseDirectColorVisuals()) {
attribs[i++] = GLX_X_VISUAL_TYPE;
attribs[i++] = GLX_DIRECT_COLOR;
}
#endif
attribs[i++] = None;
vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
#ifdef GLX_DIRECT_COLOR
if (!vinfo && X11_UseDirectColorVisuals()) { /* No DirectColor visual? Try again.. */
attribs[i - 3] = None;
vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
}
#endif
if (!vinfo) {
SDL_SetError("Couldn't find matching GLX visual");
}
return vinfo;
}
/* glXChooseVisual and glXChooseFBConfig have some small differences in
* the attribute encoding, it can be chosen with the for_FBConfig parameter.
*/
int
X11_GL_GetAttributes(_THIS, Display * display, int screen, int * attribs, int size, Bool for_FBConfig)
{
int i = 0;
const int MAX_ATTRIBUTES = 64;
/* assert buffer is large enough to hold all SDL attributes. */
SDL_assert(size >= MAX_ATTRIBUTES);
/* Setup our GLX attributes according to the gl_config. */
if( for_FBConfig ) {
attribs[i++] = GLX_RENDER_TYPE;
attribs[i++] = GLX_RGBA_BIT;
} else {
attribs[i++] = GLX_RGBA;
}
attribs[i++] = GLX_RED_SIZE;
attribs[i++] = _this->gl_config.red_size;
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = _this->gl_config.green_size;
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = _this->gl_config.blue_size;
if (_this->gl_config.alpha_size) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = _this->gl_config.alpha_size;
}
if (_this->gl_config.double_buffer) {
attribs[i++] = GLX_DOUBLEBUFFER;
if( for_FBConfig ) {
attribs[i++] = True;
}
}
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = _this->gl_config.depth_size;
if (_this->gl_config.stencil_size) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = _this->gl_config.stencil_size;
}
if (_this->gl_config.accum_red_size) {
attribs[i++] = GLX_ACCUM_RED_SIZE;
attribs[i++] = _this->gl_config.accum_red_size;
}
if (_this->gl_config.accum_green_size) {
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
attribs[i++] = _this->gl_config.accum_green_size;
}
if (_this->gl_config.accum_blue_size) {
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
attribs[i++] = _this->gl_config.accum_blue_size;
}
if (_this->gl_config.accum_alpha_size) {
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
attribs[i++] = _this->gl_config.accum_alpha_size;
}
if (_this->gl_config.stereo) {
attribs[i++] = GLX_STEREO;
if( for_FBConfig ) {
attribs[i++] = True;
}
}
if (_this->gl_config.multisamplebuffers) {
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
attribs[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attribs[i++] = GLX_SAMPLES_ARB;
attribs[i++] = _this->gl_config.multisamplesamples;
}
if (_this->gl_config.accelerated >= 0 &&
_this->gl_data->HAS_GLX_EXT_visual_rating) {
attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT :
GLX_SLOW_VISUAL_EXT;
}
/* If we're supposed to use DirectColor visuals, and we've got the
EXT_visual_info extension, then add GLX_X_VISUAL_TYPE_EXT. */
if (X11_UseDirectColorVisuals() &&
_this->gl_data->HAS_GLX_EXT_visual_info) {
attribs[i++] = GLX_X_VISUAL_TYPE_EXT;
attribs[i++] = GLX_DIRECT_COLOR_EXT;
}
attribs[i++] = None;
SDL_assert(i <= MAX_ATTRIBUTES);
return i;
}
