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Readme and blit flag bits check for texture mip chain generation example

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saschawillems 2016-09-06 22:58:11 +02:00
parent b27ad33685
commit b6cae7b7ee
4 changed files with 189 additions and 12 deletions
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11
texturemipmapgen/texturemipmapgen.cpp
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@ -141,7 +141,9 @@ public:
// Get device properites for the requested texture format
vkGetPhysicalDeviceFormatProperties(physicalDevice, format, &formatProperties);
// todo check blit flags
// Mip-chain generation requires support for blit source and destination
assert(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_BLIT_SRC_BIT);
assert(formatProperties.optimalTilingFeatures & VK_FORMAT_FEATURE_BLIT_DST_BIT);
VkMemoryAllocateInfo memAllocInfo = vkTools::initializers::memoryAllocateInfo();
VkMemoryRequirements memReqs = {};
@ -228,18 +230,13 @@ public:
// Generate the mip chain
// ---------------------------------------------------------------
// We copy down the whole mip chain doint a blit from mip-1 to mip
// We copy down the whole mip chain doing a blit from mip-1 to mip
// An alternative way would be to always blit from the first mip level and sample that one down
// todo: comment
VkCommandBuffer blitCmd = VulkanExampleBase::createCommandBuffer(VK_COMMAND_BUFFER_LEVEL_PRIMARY, true);
// Copy down mips from n-1 to n
for (int32_t i = 1; i < texture.mipLevels; i++)
{
int32_t mipWidth = texture.width >> i;
int32_t mipHeight = texture.height >> i;
VkImageBlit imageBlit{};
// Source