ClusteredLight.h

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#pragma once
 
#include "graphics/Light.h"
 
#include <cstdint>
#include <vector>
#include <glm/glm.hpp>
 
namespace eve::graphics {
 
struct ClusteredLightConfig {
    static constexpr int kTilesX = 16;
    static constexpr int kTilesY = 9;
    static constexpr int kSlices = 24;
    static constexpr int kClusterCount = kTilesX * kTilesY * kSlices;
    static constexpr int kMaxLights = 256;
    static constexpr int kMaxLightsPerCluster = 32;
};
 
using ClusteredLightGpu = Light3DGpu;
 
struct ClusterTableEntry {
    uint32_t offset = 0;
    uint32_t count = 0;
};
 
struct ClusteredLightingUpload {
    glm::vec4 ambient{0.12f, 0.12f, 0.14f, 0.f};
    glm::vec4 gridInfo{float(ClusteredLightConfig::kTilesX), float(ClusteredLightConfig::kTilesY),
                       float(ClusteredLightConfig::kSlices), 0.f};  // w = point light count
    glm::vec4 clipInfo{0.1f, 100.f, 1.f, 1.f};  // near, far, screenW, screenH
    glm::mat4 view{1.f};
    glm::vec4 primaryDir{0.4f, 1.f, 0.3f, 0.f};  // toward surface; w=1 if valid
    glm::vec4 primaryColor{1.f, 1.f, 1.f, 1.f};
    std::vector<ClusteredLightGpu> lights;           // point lights only (world space)
    std::vector<ClusterTableEntry> clusterTable;     // size = kClusterCount
    std::vector<uint32_t> lightIndices;
    uint32_t truncatedLightCount = 0;
    uint32_t overflowClusterCount = 0;
    uint32_t droppedLightReferenceCount = 0;
    bool active = false;
};
 
EVENGINE_API_BACKENDS ClusteredLightingUpload buildClusteredLighting(const std::vector<ClusteredLightGpu> &points,
                                                                     const std::vector<ClusteredLightGpu> &dirs,
                                                                     const glm::mat4 &view, float nearZ, float farZ,
                                                                     int screenW, int screenH, float fovYRad,
                                                                     const glm::vec4 &ambient);
 
}  // namespace eve::graphics