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Don't try to allocate a msaa FBO when it is not supported.

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Change-Id: Ib4bdabcfa4e9b76156d7188da82fe2173b4b997e
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
This commit is contained in:
Gunnar Sletta 2013-09-18 06:55:33 +00:00 committed by The Qt Project
parent 03520d7fde
commit 16c47c3b34
1 changed files with 12 additions and 15 deletions
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27
src/gui/opengl/qopenglframebufferobject.cpp
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@ -425,6 +425,17 @@ void QOpenGLFramebufferObjectPrivate::init(QOpenGLFramebufferObject *, const QSi
if (!funcs.hasOpenGLFeature(QOpenGLFunctions::Framebuffers))
return;
// Fall back to using a normal non-msaa FBO if we don't have support for MSAA
if (!funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample)
|| !funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferBlit)) {
samples = 0;
}
GLint maxSamples;
glGetIntegerv(GL_MAX_SAMPLES, &maxSamples);
samples = qBound(0, int(samples), int(maxSamples));
size = sz;
target = texture_target;
// texture dimensions
@ -473,25 +484,11 @@ void QOpenGLFramebufferObjectPrivate::init(QOpenGLFramebufferObject *, const QSi
color_buffer = 0;
} else {
mipmap = false;
GLint maxSamples;
glGetIntegerv(GL_MAX_SAMPLES, &maxSamples);
samples = qBound(0, int(samples), int(maxSamples));
funcs.glGenRenderbuffers(1, &color_buffer);
funcs.glBindRenderbuffer(GL_RENDERBUFFER, color_buffer);
if (funcs.hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample) && samples > 0) {
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples,
internal_format, size.width(), size.height());
} else {
samples = 0;
funcs.glRenderbufferStorage(GL_RENDERBUFFER, internal_format,
size.width(), size.height());
}
funcs.glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples, internal_format, size.width(), size.height());
funcs.glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, color_buffer);
QT_CHECK_GLERROR();
valid = checkFramebufferStatus(ctx);