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Use dedicated render pass for offscreen frame buffer with matching attachment formats (Fixes #68)

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This commit is contained in:
saschawillems 2016-03-10 21:17:48 +01:00
parent 3e8ce7f9d3
commit 73c11f6dba
1 changed files with 61 additions and 8 deletions
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69
shadowmapping/shadowmapping.cpp
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@ -130,6 +130,7 @@ public:
int32_t width, height;
VkFramebuffer frameBuffer;
FrameBufferAttachment color, depth;
VkRenderPass renderPass;
vkTools::VulkanTexture textureTarget;
} offScreenFrameBuf;
@ -268,6 +269,59 @@ public:
flushSetupCommandBuffer();
}
// Set up a separate render pass for the offscreen frame buffer
// This is necessary as the offscreen frame buffer attachments
// use formats different to the ones from the visible frame buffer
// and at least the depth one may not be compatible
void setupOffScreenRenderPass()
{
VkAttachmentDescription attDesc[2];
attDesc[0].format = FB_COLOR_FORMAT;
attDesc[0].samples = VK_SAMPLE_COUNT_1_BIT;
attDesc[0].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
attDesc[0].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
attDesc[0].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
attDesc[0].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
attDesc[0].initialLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
attDesc[0].finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
attDesc[1].format = DEPTH_FORMAT;
attDesc[1].samples = VK_SAMPLE_COUNT_1_BIT;
attDesc[1].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
// Since we need to copy the depth attachment contents to our texture
// used for shadow mapping we must use STORE_OP_STORE to make sure that
// the depth attachment contents are preserved after rendering to it
// has finished
attDesc[1].storeOp = VK_ATTACHMENT_STORE_OP_STORE;
attDesc[1].stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
attDesc[1].stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
attDesc[1].initialLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
attDesc[1].finalLayout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
VkAttachmentReference colorReference = {};
colorReference.attachment = 0;
colorReference.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
VkAttachmentReference depthReference = {};
depthReference.attachment = 1;
depthReference.layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
VkSubpassDescription subpass = {};
subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
subpass.colorAttachmentCount = 1;
subpass.pColorAttachments = &colorReference;
subpass.pDepthStencilAttachment = &depthReference;
VkRenderPassCreateInfo renderPassCreateInfo = vkTools::initializers::renderPassCreateInfo();
renderPassCreateInfo.attachmentCount = 2;
renderPassCreateInfo.pAttachments = attDesc;
renderPassCreateInfo.subpassCount = 1;
renderPassCreateInfo.pSubpasses = &subpass;
VkResult err = vkCreateRenderPass(device, &renderPassCreateInfo, nullptr, &offScreenFrameBuf.renderPass);
assert(!err);
}
void prepareOffscreenFramebuffer()
{
createSetupCommandBuffer();
@ -370,10 +424,11 @@ public:
attachments[0] = offScreenFrameBuf.color.view;
attachments[1] = offScreenFrameBuf.depth.view;
VkFramebufferCreateInfo fbufCreateInfo = {};
fbufCreateInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
fbufCreateInfo.pNext = NULL;
fbufCreateInfo.renderPass = renderPass;
setupOffScreenRenderPass();
// Create frame buffer
VkFramebufferCreateInfo fbufCreateInfo = vkTools::initializers::framebufferCreateInfo();
fbufCreateInfo.renderPass = offScreenFrameBuf.renderPass;
fbufCreateInfo.attachmentCount = 2;
fbufCreateInfo.pAttachments = attachments;
fbufCreateInfo.width = offScreenFrameBuf.width;
@ -408,10 +463,8 @@ public:
clearValues[0].color = { { 0.0f, 0.0f, 0.0f, 1.0f } };
clearValues[1].depthStencil = { 1.0f, 0 };
VkRenderPassBeginInfo renderPassBeginInfo = {};
renderPassBeginInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
renderPassBeginInfo.pNext = NULL;
renderPassBeginInfo.renderPass = renderPass;
VkRenderPassBeginInfo renderPassBeginInfo = vkTools::initializers::renderPassBeginInfo();
renderPassBeginInfo.renderPass = offScreenFrameBuf.renderPass;
renderPassBeginInfo.framebuffer = offScreenFrameBuf.frameBuffer;
renderPassBeginInfo.renderArea.offset.x = 0;
renderPassBeginInfo.renderArea.offset.y = 0;