IBLResources.h

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#pragma once

 
#include <vulkan/vulkan_core.h>
#include <cstdint>
 
namespace Engine::Core
{
    class ApplicationContext;
}  // namespace Engine::Core
 
namespace Engine::Rendering
{
    class ImageBasedLightingResources
    {
    public:
        ImageBasedLightingResources() = default;

        void createPlaceholders( Core::ApplicationContext * context, VkCommandPool commandPool);

        void generateBrdfLut(
            Core::ApplicationContext * context,
            VkCommandPool commandPool,
            VkPipeline brdfLutComputePipeline,
            VkPipelineLayout brdfLutPipelineLayout,
            VkDescriptorSet brdfLutDescriptorSet
        );
 
        [[nodiscard]] const VkDescriptorImageInfo& getCubemapDescriptorInfo() const { return cubemapDescriptorInfo_; }
        [[nodiscard]] const VkDescriptorImageInfo& getBrdfLutDescriptorInfo() const { return brdfLutDescriptorInfo_; }
 
        void setCubemapDescriptorInfo( const VkDescriptorImageInfo & descriptorInfo );
 
        [[nodiscard]] VkImageView getBrdfLutImageView() const { return brdfLutView_; }
        [[nodiscard]] VkImage getBrdfLutImage() const { return brdfLutImage_; }
 
        void cleanup(VkDevice device);
 
    private:
        // Placeholder cubemap (1x1 black, 6 faces)
        VkImage placeholderCubemapImage_ = VK_NULL_HANDLE;
        VkDeviceMemory placeholderCubemapMemory_ = VK_NULL_HANDLE;
        VkImageView placeholderCubemapView_ = VK_NULL_HANDLE;
        VkSampler cubemapSampler_ = VK_NULL_HANDLE;
 
        // BRDF LUT (512x512, RG16F)
        static constexpr uint32_t BRDF_LUT_SIZE = 512;
        VkImage brdfLutImage_ = VK_NULL_HANDLE;
        VkDeviceMemory brdfLutMemory_ = VK_NULL_HANDLE;
        VkImageView brdfLutView_ = VK_NULL_HANDLE;
        VkSampler brdfLutSampler_ = VK_NULL_HANDLE;
 
        // Cached descriptor infos
        VkDescriptorImageInfo cubemapDescriptorInfo_{};
        VkDescriptorImageInfo brdfLutDescriptorInfo_{};
 
        void createBrdfLutImage(VkDevice device, VkPhysicalDevice physicalDevice);
        void createSamplers(VkDevice device);
        void updateDescriptorInfos();
    };
 
}  // namespace EngineCore