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Additional semaphore to synchronize offscreen and final render (Refs #70)

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saschawillems 2016-06-05 18:01:53 +02:00
parent 046d0f2c42
commit 1b32af6997
1 changed files with 31 additions and 11 deletions
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42
bloom/bloom.cpp
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@ -1185,18 +1185,38 @@ public:
{
VulkanExampleBase::prepareFrame();
// Gather command buffers to be sumitted to the queue
std::vector<VkCommandBuffer> submitCmdBuffers;
// Submit offscreen rendering command buffer
// todo : use event to ensure that offscreen result is finished bfore render command buffer is started
if (bloom)
{
submitCmdBuffers.push_back(offScreenCmdBuffer);
}
submitCmdBuffers.push_back(drawCmdBuffers[currentBuffer]);
submitInfo.commandBufferCount = submitCmdBuffers.size();
submitInfo.pCommandBuffers = submitCmdBuffers.data();
// The scene render command buffer has to wait for the offscreen
// rendering to be finished before we can use the framebuffer
// color image for sampling during final rendering
// To ensure this we use a dedicated offscreen synchronization
// semaphore that will be signaled when offscreen renderin
// has been finished
// This is necessary as an implementation may start both
// command buffers at the same time, there is no guarantee
// that command buffers will be executed in the order they
// have been submitted by the application
// Offscreen rendering
// Wait for swap chain presentation to finish
submitInfo.pWaitSemaphores = &semaphores.presentComplete;
// Signal ready with offscreen semaphore
submitInfo.pSignalSemaphores = &offscreenSemaphore;
// Submit work
submitInfo.commandBufferCount = 1;
submitInfo.pCommandBuffers = &offScreenCmdBuffer;
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
// Scene rendering
// Wait for offscreen semaphore
submitInfo.pWaitSemaphores = &offscreenSemaphore;
// Signal ready with render complete semaphpre
submitInfo.pSignalSemaphores = &semaphores.renderComplete;
// Submit work
submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
VulkanExampleBase::submitFrame();