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Build command buffers for pre and post present barriers only once (instead of every frame)

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This commit is contained in:
saschawillems 2016-06-21 23:07:16 +02:00
parent d944af8604
commit 8f76a24e53
3 changed files with 134 additions and 51 deletions
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78
triangle/triangle.cpp
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@ -292,6 +292,44 @@ public:
VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
}
// Build command buffers for the post present image barrier for each swap chain image
// Note: The command Buffers are allocated in the base class
for (uint32_t i = 0; i < swapChain.imageCount; i++)
{
// Insert a post present image barrier to transform the image back to a
// color attachment that our render pass can write to
// We always use undefined image layout as the source as it doesn't actually matter
// what is done with the previous image contents
VkImageMemoryBarrier postPresentBarrier = vkTools::initializers::imageMemoryBarrier();
postPresentBarrier.srcAccessMask = 0;
postPresentBarrier.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
postPresentBarrier.oldLayout = VK_IMAGE_LAYOUT_UNDEFINED;
postPresentBarrier.newLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
postPresentBarrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
postPresentBarrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
postPresentBarrier.subresourceRange = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 };
postPresentBarrier.image = swapChain.buffers[i].image;
// Use dedicated command buffer from example base class for submitting the post present barrier
VkCommandBufferBeginInfo cmdBufInfo = {};
cmdBufInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
VK_CHECK_RESULT(vkBeginCommandBuffer(postPresentCmdBuffers[i], &cmdBufInfo));
// Put post present barrier into command buffer
vkCmdPipelineBarrier(
postPresentCmdBuffers[i],
VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
VK_FLAGS_NONE,
0, nullptr,
0, nullptr,
1, &postPresentBarrier);
VK_CHECK_RESULT(vkEndCommandBuffer(postPresentCmdBuffers[i]));
}
}
void draw()
@ -299,43 +337,12 @@ public:
// Get next image in the swap chain (back/front buffer)
VK_CHECK_RESULT(swapChain.acquireNextImage(semaphores.presentComplete, &currentBuffer));
// Insert a post present image barrier to transform the image back to a
// color attachment that our render pass can write to
// We always use undefined image layout as the source as it doesn't actually matter
// what is done with the previous image contents
VkImageMemoryBarrier postPresentBarrier = vkTools::initializers::imageMemoryBarrier();
postPresentBarrier.srcAccessMask = 0;
postPresentBarrier.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
postPresentBarrier.oldLayout = VK_IMAGE_LAYOUT_UNDEFINED;
postPresentBarrier.newLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
postPresentBarrier.srcQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
postPresentBarrier.dstQueueFamilyIndex = VK_QUEUE_FAMILY_IGNORED;
postPresentBarrier.subresourceRange = { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 };
postPresentBarrier.image = swapChain.buffers[currentBuffer].image;
// Use dedicated command buffer from example base class for submitting the post present barrier
VkCommandBufferBeginInfo cmdBufInfo = {};
cmdBufInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
VK_CHECK_RESULT(vkBeginCommandBuffer(postPresentCmdBuffer, &cmdBufInfo));
// Put post present barrier into command buffer
vkCmdPipelineBarrier(
postPresentCmdBuffer,
VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,
VK_FLAGS_NONE,
0, nullptr,
0, nullptr,
1, &postPresentBarrier);
VK_CHECK_RESULT(vkEndCommandBuffer(postPresentCmdBuffer));
// Submit the image barrier to the current queue
submitInfo = {};
// Submit the post present image barrier to transform the image back to a color attachment
// that can be used to write to by our render pass
VkSubmitInfo submitInfo = {};
submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
submitInfo.commandBufferCount = 1;
submitInfo.pCommandBuffers = &postPresentCmdBuffer;
submitInfo.pCommandBuffers = &postPresentCmdBuffers[currentBuffer];
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
@ -347,7 +354,6 @@ public:
// command buffers and semaphores to be submitted to a queue
// If you want to submit multiple command buffers, pass an array
VkPipelineStageFlags pipelineStages = VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT;
VkSubmitInfo submitInfo = {};
submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
submitInfo.pWaitDstStageMask = &pipelineStages;
// The wait semaphore ensures that the image is presented