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Verify that context is robust before resolving robust functions

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The extensions specify that you are only allwoed to use the robust
functions if the context is robust. Given that we need to query
whether the robust is context and fall back to our workaround if
the context is not robust.

REVIEW: 126051
This commit is contained in:
Martin Gräßlin 2015-11-13 11:42:01 +01:00
parent b383db2e2e
commit 1d75cd26fb
1 changed files with 21 additions and 2 deletions
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23
libkwineffects/kwinglutils_funcs.cpp
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@ -19,6 +19,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "kwinglutils.h"
#include "kwinglplatform.h"
#include <dlfcn.h>
#if HAVE_EPOXY_GLX
@ -84,12 +85,30 @@ void eglResolveFunctions()
void glResolveFunctions(OpenGLPlatformInterface platformInterface)
{
if (hasGLExtension(QByteArrayLiteral("GL_ARB_robustness"))) {
const bool haveArbRobustness = hasGLExtension(QByteArrayLiteral("GL_ARB_robustness"));
const bool haveExtRobustness = hasGLExtension(QByteArrayLiteral("GL_EXT_robustness"));
bool robustContext = false;
if (GLPlatform::instance()->isGLES()) {
if (haveExtRobustness) {
GLint value = 0;
glGetIntegerv(GL_CONTEXT_ROBUST_ACCESS_EXT, &value);
robustContext = (value != 0);
}
} else {
if (haveArbRobustness) {
GLint value = 0;
glGetIntegerv(GL_CONTEXT_FLAGS, &value);
if (value & GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB) {
robustContext = true;
}
}
}
if (robustContext && haveArbRobustness) {
// See http://www.opengl.org/registry/specs/ARB/robustness.txt
GL_RESOLVE_WITH_EXT(kwinGlGetGraphicsResetStatus, glGetGraphicsResetStatusARB);
GL_RESOLVE_WITH_EXT(kwinGlReadnPixels, glReadnPixelsARB);
GL_RESOLVE_WITH_EXT(kwinGlGetnUniformfv, glGetnUniformfvARB);
} else if (hasGLExtension(QByteArrayLiteral("GL_EXT_robustness"))) {
} else if (robustContext && haveExtRobustness) {
// See http://www.khronos.org/registry/gles/extensions/EXT/EXT_robustness.txt
kwinGlGetGraphicsResetStatus = (kwinGlGetGraphicsResetStatus_func) eglGetProcAddress("glGetGraphicsResetStatusEXT");
kwinGlReadnPixels = (kwinGlReadnPixels_func) eglGetProcAddress("glReadnPixelsEXT");