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Rework GL framebuffer config selection.

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This commit is contained in:
Roz K 2022-12-29 16:24:37 +01:00
parent 919ba9291f
commit ed6c852102
Signed by: roz
GPG Key ID: 51FBF4E483E1C822
1 changed files with 24 additions and 32 deletions
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56
cpp/display/display_glx.cpp
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@ -28,6 +28,7 @@ static bool rk_error_occured = false;
typedef GLXContext (*rk_CreateContextAttribsFunc)(Display *, GLXFBConfig, GLXContext, Bool, int const *);
static int const rk_visual_attribs[] = {
GLX_CONFIG_CAVEAT, GLX_NONE,
GLX_X_RENDERABLE, True,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
@ -140,42 +141,33 @@ rk_display_t rk_create_display(
return nullptr;
}
int fbcount;
GLXFBConfig * const fbc = glXChooseFBConfig(
display->display, DefaultScreen(display->display), rk_visual_attribs, &fbcount);
if (!fbc) {
int fb_count = 0;
GLXFBConfig * const fb_configs = glXChooseFBConfig(
display->display, DefaultScreen(display->display), rk_visual_attribs, &fb_count);
printf("[GLX] Found %d framebuffer configs.\n", fb_count);
if (!fb_configs || !fb_count) {
rk_glx_printf("Failed to retrieve framebuffer configs.");
rk_destroy_display(reinterpret_cast<rk_display_t>(display));
return nullptr;
}
printf("[GLX] Found %d framebuffer configs.\n", fbcount);
GLXFBConfig const fb_config = fb_configs[0];
XFree(fb_configs);
int red_size = 0;
glXGetFBConfigAttrib(display->display, fb_config, GLX_RED_SIZE, &red_size);
int green_size = 0;
glXGetFBConfigAttrib(display->display, fb_config, GLX_GREEN_SIZE, &green_size);
int blue_size = 0;
glXGetFBConfigAttrib(display->display, fb_config, GLX_BLUE_SIZE, &blue_size);
int alpha_size = 0;
glXGetFBConfigAttrib(display->display, fb_config, GLX_ALPHA_SIZE, &alpha_size);
int depth_size = 0;
glXGetFBConfigAttrib(display->display, fb_config, GLX_DEPTH_SIZE, &depth_size);
int stencil_size = 0;
glXGetFBConfigAttrib(display->display, fb_config, GLX_STENCIL_SIZE, &stencil_size);
printf("[GLX] Select framebuffer config R%dG%dB%dA%d D%dS%d.\n",
red_size, green_size, blue_size, alpha_size, depth_size, stencil_size);
int best_fbc = -1;
int best_num_samp = -1;
for (int i = 0; i < fbcount; ++i) {
XVisualInfo * const vi = glXGetVisualFromFBConfig(display->display, fbc[i]);
if (vi) {
int samp_buf, samples;
glXGetFBConfigAttrib(display->display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf);
glXGetFBConfigAttrib(display->display, fbc[i], GLX_SAMPLES, &samples);
if (best_fbc < 0 || (samp_buf && samples > best_num_samp)) {
best_fbc = i;
best_num_samp = samples;
}
XFree(vi);
}
}
if (best_fbc == -1) {
XFree(fbc);
rk_glx_printf("Failed to find a suitable framebuffer config.");
rk_destroy_display(reinterpret_cast<rk_display_t>(display));
return nullptr;
}
GLXFBConfig const bestFbc = fbc[best_fbc];
XFree(fbc);
printf("[GLX] Select framebuffer config with %d samples.\n", best_num_samp);
XVisualInfo * const vi = glXGetVisualFromFBConfig(display->display, bestFbc);
XVisualInfo * const vi = glXGetVisualFromFBConfig(display->display, fb_config);
display->colormap = XCreateColormap(
display->display, RootWindow(display->display, vi->screen), vi->visual, AllocNone);
XSetWindowAttributes swa;
@ -194,7 +186,7 @@ rk_display_t rk_create_display(
rk_error_occured = false;
int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(&rk_error_handler);
display->context = glXCreateContextAttribs(display->display, bestFbc, 0, True, rk_context_attribs);
display->context = glXCreateContextAttribs(display->display, fb_config, 0, True, rk_context_attribs);
XSync(display->display, False);
XSetErrorHandler(oldHandler);
if (rk_error_occured || !display->context) {