Ktx2Loader.h

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#pragma once
#include <cstdint>
#include <filesystem>
#include <string>
#include <vector>
#include <vulkan/vulkan_core.h>
 
namespace Engine::Assets {
 
    namespace Textures
    {
        struct Ktx2TextureData {
            uint32_t baseWidth = 0;
            uint32_t baseHeight = 0;
            uint32_t sourceWidth = 0;
            uint32_t sourceHeight = 0;
            VkFormat vkFormat = VK_FORMAT_UNDEFINED;
            uint32_t mipLevels = 0;
            uint32_t sourceMipLevels = 0;
            uint32_t sourceBaseMip = 0;
            bool isCompressed = false;
            std::vector<uint8_t> allData;
            std::vector<VkDeviceSize> mipOffsets;
            std::vector<VkDeviceSize> mipSizes;
            std::vector<uint32_t> mipWidths;
            std::vector<uint32_t> mipHeights;
            std::string uri;
        };
 
        Ktx2TextureData extractMipRange(const Ktx2TextureData& source, uint32_t firstMip, uint32_t mipCount);
    }
 
    namespace Loaders
    {
        enum class Ktx2TextureType : uint32_t
        {
            BC6H_Unsigned = 0x8E8F,  // GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT
            BC6H_Signed = 0x8E8E,      // GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT
            BC7_RGBA = 0x8E8C,         // GL_COMPRESSED_RGBA_BPTC_UNORM
            BC7_SRGB = 0x8E8D,         // GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM
            BC4_Unsigned = 0x8DBB,     // GL_COMPRESSED_RED_RGTC1
            BC4_Signed = 0x8DBC,       // GL_COMPRESSED_SIGNED_RED_RGTC1
            BC5_Unsigned = 0x8DBD,     // GL_COMPRESSED_RG_RGTC2
            BC5_Signed = 0x8DBE,       // GL_COMPRESSED_SIGNED_RG_RGTC2
        };

        class Ktx2Loader {
        public:
            Ktx2Loader() = default;
            ~Ktx2Loader() = default;
 
            Textures::Ktx2TextureData load(const std::filesystem::path& filename);
        };
    }
 
} // namespace EngineCore