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glx: Do additional sorting of fbconfigs

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Prefer configurations with smaller depth/stencil sizes.
This commit is contained in:
Fredrik Höglund 2014-12-08 22:45:13 +01:00
parent fb4e733bcc
commit ca777f38f1
1 changed files with 79 additions and 17 deletions
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96
glxbackend.cpp
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@ -43,6 +43,9 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <unistd.h>
#include <xcb/glx.h>
#include <deque>
#include <algorithm>
#ifndef XCB_GLX_BUFFER_SWAP_COMPLETE
#define XCB_GLX_BUFFER_SWAP_COMPLETE 1
typedef struct xcb_glx_buffer_swap_complete_event_t {
@ -142,15 +145,20 @@ static bool gs_tripleBufferNeedsDetection = false;
void GlxBackend::init()
{
initGLX();
// require at least GLX 1.3
// Require at least GLX 1.3
if (!hasGLXVersion(1, 3)) {
setFailed(QStringLiteral("Requires at least GLX 1.3"));
return;
}
initVisualDepthHashTable();
if (!initBuffer()) {
setFailed(QStringLiteral("Could not initialize the buffer"));
return;
}
if (!initRenderingContext()) {
setFailed(QStringLiteral("Could not initialize rendering context"));
return;
@ -239,8 +247,6 @@ void GlxBackend::init()
setIsDirectRendering(bool(glXIsDirect(display(), ctx)));
qDebug() << "Direct rendering:" << isDirectRendering() << endl;
initVisualDepthHashTable();
}
bool GlxBackend::initRenderingContext()
@ -365,12 +371,40 @@ bool GlxBackend::initFbConfig()
int count = 0;
GLXFBConfig *configs = glXChooseFBConfig(display(), DefaultScreen(display()), attribs, &count);
if (count > 0) {
fbconfig = configs[0];
XFree(configs);
struct FBConfig {
GLXFBConfig config;
int depth;
int stencil;
};
std::deque<FBConfig> candidates;
for (int i = 0; i < count; i++) {
int depth, stencil;
glXGetFBConfigAttrib(display(), configs[i], GLX_DEPTH_SIZE, &depth);
glXGetFBConfigAttrib(display(), configs[i], GLX_STENCIL_SIZE, &stencil);
candidates.emplace_back(FBConfig{configs[i], depth, stencil});
}
if (fbconfig == NULL) {
if (count > 0)
XFree(configs);
std::stable_sort(candidates.begin(), candidates.end(), [](const FBConfig &left, const FBConfig &right) {
if (left.depth < right.depth)
return true;
if (left.stencil < right.stencil)
return true;
return false;
});
if (candidates.size() > 0) {
fbconfig = candidates.front().config;
}
if (fbconfig == nullptr) {
qCCritical(KWIN_CORE) << "Failed to find a usable framebuffer configuration";
return false;
}
@ -453,6 +487,15 @@ FBConfigInfo *GlxBackend::infoForVisual(xcb_visualid_t visual)
return info;
}
struct FBConfig {
GLXFBConfig config;
int depth;
int stencil;
int format;
};
std::deque<FBConfig> candidates;
for (int i = 0; i < count; i++) {
int red, green, blue;
glXGetFBConfigAttrib(display(), configs[i], GLX_RED_SIZE, &red);
@ -475,27 +518,46 @@ FBConfigInfo *GlxBackend::infoForVisual(xcb_visualid_t visual)
if (!bind_rgb && !bind_rgba)
continue;
int depth, stencil;
glXGetFBConfigAttrib(display(), configs[i], GLX_DEPTH_SIZE, &depth);
glXGetFBConfigAttrib(display(), configs[i], GLX_STENCIL_SIZE, &stencil);
int texture_format;
if (alpha_bits)
texture_format = bind_rgba ? GLX_TEXTURE_FORMAT_RGBA_EXT : GLX_TEXTURE_FORMAT_RGB_EXT;
else
texture_format = bind_rgb ? GLX_TEXTURE_FORMAT_RGB_EXT : GLX_TEXTURE_FORMAT_RGBA_EXT;
int y_inverted, texture_targets;
glXGetFBConfigAttrib(display(), configs[i], GLX_BIND_TO_TEXTURE_TARGETS_EXT, &texture_targets);
glXGetFBConfigAttrib(display(), configs[i], GLX_Y_INVERTED_EXT, &y_inverted);
info->fbconfig = configs[i];
info->bind_texture_format = texture_format;
info->texture_targets = texture_targets;
info->y_inverted = y_inverted;
info->mipmap = 0;
break;
candidates.emplace_back(FBConfig{configs[i], depth, stencil, texture_format});
}
if (count > 0)
XFree(configs);
std::stable_sort(candidates.begin(), candidates.end(), [](const FBConfig &left, const FBConfig &right) {
if (left.depth < right.depth)
return true;
if (left.stencil < right.stencil)
return true;
return false;
});
if (candidates.size() > 0) {
const FBConfig &candidate = candidates.front();
int y_inverted, texture_targets;
glXGetFBConfigAttrib(display(), candidate.config, GLX_BIND_TO_TEXTURE_TARGETS_EXT, &texture_targets);
glXGetFBConfigAttrib(display(), candidate.config, GLX_Y_INVERTED_EXT, &y_inverted);
info->fbconfig = candidate.config;
info->bind_texture_format = candidate.format;
info->texture_targets = texture_targets;
info->y_inverted = y_inverted;
info->mipmap = 0;
}
if (info->fbconfig) {
int fbc_id = 0;
int visual_id = 0;