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Depth format selection function in vkTools namespace. #11 #13

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This commit is contained in:
saschawillems 2016-02-18 21:44:26 +01:00
parent 1647082260
commit f5919fc988
3 changed files with 33 additions and 18 deletions
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20
base/vulkanexamplebase.cpp
View file

@ -522,24 +522,8 @@ void VulkanExampleBase::initVulkan(bool enableValidation)
// Get the graphics queue
vkGetDeviceQueue(device, graphicsQueueIndex, 0, &queue);
// Find supported depth format
// We prefer 24 bits of depth and 8 bits of stencil, but that may not be supported by all implementations
std::vector<VkFormat> depthFormats = { VK_FORMAT_D24_UNORM_S8_UINT, VK_FORMAT_D16_UNORM_S8_UINT, VK_FORMAT_D16_UNORM };
bool depthFormatFound = false;
for (auto& format : depthFormats)
{
VkFormatProperties formatProps;
vkGetPhysicalDeviceFormatProperties(physicalDevice, format, &formatProps);
// Format must support depth stencil attachment for optimal tiling
if (formatProps.optimalTilingFeatures && VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT)
{
depthFormat = format;
depthFormatFound = true;
break;
}
}
assert(depthFormatFound);
VkBool32 validDepthFormat = vkTools::getSupportedDepthFormat(physicalDevice, &depthFormat);
assert(validDepthFormat);
swapChain.init(instance, physicalDevice, device);
}

27
base/vulkantools.cpp
View file

@ -74,6 +74,33 @@ namespace vkTools
}
}
VkBool32 getSupportedDepthFormat(VkPhysicalDevice physicalDevice, VkFormat *depthFormat)
{
// Since all depth formats may be optional, we need to find a suitable depth format to use
// Start with the highest precision packed format
std::vector<VkFormat> depthFormats = {
VK_FORMAT_D32_SFLOAT_S8_UINT,
VK_FORMAT_D32_SFLOAT,
VK_FORMAT_D24_UNORM_S8_UINT,
VK_FORMAT_D16_UNORM_S8_UINT,
VK_FORMAT_D16_UNORM
};
for (auto& format : depthFormats)
{
VkFormatProperties formatProps;
vkGetPhysicalDeviceFormatProperties(physicalDevice, format, &formatProps);
// Format must support depth stencil attachment for optimal tiling
if (formatProps.optimalTilingFeatures & VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT)
{
*depthFormat = format;
return true;
}
}
return false;
}
// Create an image memory barrier for changing the layout of
// an image and put it into an active command buffer
// See chapter 11.4 "Image Layout" for details

4
base/vulkantools.h
View file

@ -38,6 +38,10 @@ namespace vkTools
// Return string representation of a vulkan error string
std::string errorString(VkResult errorCode);
// Selected a suitable supported depth format starting with 32 bit down to 16 bit
// Returns false if none of the depth formats in the list is supported by the device
VkBool32 getSupportedDepthFormat(VkPhysicalDevice physicalDevice, VkFormat *depthFormat);
// Put an image memory barrier for setting an image layout into the given command buffer
void setImageLayout(
VkCommandBuffer cmdbuffer,