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strenghening the checks in GLBackend::downloadFramebuffer before actually calling the true glReadPixels

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This commit is contained in:
Sam Gateau 2015-07-23 16:31:11 -07:00
parent be9d99264f
commit d56b5f39fb
2 changed files with 20 additions and 4 deletions
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2
interface/src/Application.cpp
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@ -3436,7 +3436,6 @@ void Application::renderRearViewMirror(RenderArgs* renderArgs, const QRect& regi
gpu::Vec4i viewport;
if (billboard) {
QSize size = DependencyManager::get<FramebufferCache>()->getFrameBufferSize();
// viewport = gpu::Vec4i(region.x(), size.height() - region.y() - region.height(), region.width(), region.height());
viewport = gpu::Vec4i(0, 0, region.width(), region.height());
} else {
// if not rendering the billboard, the region is in device independent coordinates; must convert to device
@ -3446,7 +3445,6 @@ void Application::renderRearViewMirror(RenderArgs* renderArgs, const QRect& regi
int y = region.y() * ratio;
int width = region.width() * ratio;
int height = region.height() * ratio;
// viewport = gpu::Vec4i(x, size.height() - y - height, width, height);
viewport = gpu::Vec4i(0, 0, width, height);
}
renderArgs->_viewport = viewport;

22
libraries/gpu/src/gpu/GLBackendOutput.cpp
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@ -196,9 +196,27 @@ void GLBackend::do_blit(Batch& batch, uint32 paramOffset) {
void GLBackend::downloadFramebuffer(const FramebufferPointer& srcFramebuffer, const Vec4i& region, QImage& destImage) {
auto readFBO = gpu::GLBackend::getFramebufferID(srcFramebuffer);
if (srcFramebuffer && readFBO) {
if ((srcFramebuffer->getWidth() < (region.x + region.z)) || (srcFramebuffer->getHeight() < (region.y + region.w))) {
qCDebug(gpulogging) << "GLBackend::downloadFramebuffer : srcFramebuffer is too small to provide the region queried";
return;
}
}
if ((destImage.width() < region.z) || (destImage.height() < region.w)) {
qCDebug(gpulogging) << "GLBackend::downloadFramebuffer : destImage is too small to receive the region of the framebuffer";
return;
}
GLenum format = GL_BGRA;
if (destImage.format() != QImage::Format_ARGB32) {
qCDebug(gpulogging) << "GLBackend::downloadFramebuffer : destImage format must be FORMAT_ARGB32 to receive the region of the framebuffer";
return;
}
glBindFramebuffer(GL_READ_FRAMEBUFFER, gpu::GLBackend::getFramebufferID(srcFramebuffer));
glReadPixels(region.x, region.y, region.z, region.w, GL_BGRA, GL_UNSIGNED_BYTE, destImage.bits());
glReadPixels(region.x, region.y, region.z, region.w, format, GL_UNSIGNED_BYTE, destImage.bits());
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
(void) CHECK_GL_ERROR();