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EGL backend: Check if implementation supports swap interval of 1 before setting it

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REVIEW: 110023
This commit is contained in:
Ralf Jung 2013-04-12 14:05:19 +02:00
parent c9f852a73f
commit 84c904d6f9
1 changed files with 15 additions and 6 deletions
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21
eglonxbackend.cpp
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@ -88,12 +88,21 @@ void EglOnXBackend::init()
if (surfaceHasSubPost) { if (surfaceHasSubPost) {
kDebug(1212) << "EGL implementation and surface support eglPostSubBufferNV, let's use it"; kDebug(1212) << "EGL implementation and surface support eglPostSubBufferNV, let's use it";
// set swap interval appropriately if (options->glPreferBufferSwap() != Options::NoSwapEncourage) {
const bool wantSync = options->glPreferBufferSwap() != Options::NoSwapEncourage; // check if swap interval 1 is supported
const EGLBoolean res = eglSwapInterval(dpy, wantSync ? 1 : 0); EGLint val;
if (res && wantSync) { eglGetConfigAttrib(dpy, config, EGL_MAX_SWAP_INTERVAL, &val);
kDebug(1212) << "Enabled v-sync"; if (val >= 1) {
setHasWaitSync(true); if (eglSwapInterval(dpy, 1)) {
kDebug(1212) << "Enabled v-sync";
setHasWaitSync(true);
}
} else {
kWarning(1212) << "Cannot enable v-sync as max. swap interval is" << val;
}
} else {
// disable v-sync
eglSwapInterval(dpy, 0);
} }
} else { } else {
/* In the GLX backend, we fall back to using glCopyPixels if we have no extension providing support for partial screen updates. /* In the GLX backend, we fall back to using glCopyPixels if we have no extension providing support for partial screen updates.