Shadow.h

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#pragma once
#include "common/Export.h"
 
 
#include <cstdint>
#include <glm/glm.hpp>
 
namespace eve::graphics {
 
enum class ShadowMethod : std::uint8_t {
    Auto = 0,
    None,
    CascadedDirectional,
    PerspectiveSpot,
    CubePoint,
};
 
struct ShadowConfig {
    static constexpr int kCascades = 3;
    static constexpr int kLocalSlots = 4;
    static constexpr int kTotalLayers = kCascades + kLocalSlots;
    static constexpr int kMapSize = 2048;
    static constexpr float kSplitLambda = 0.7f;
    static constexpr float kMaxDistance = 64.f;
};
 
struct ShadowUBO {
    glm::mat4 lightVP[ShadowConfig::kCascades]{};
    glm::vec4 splits{0.f};  // xyz = view-space +Z split ends (camera-forward distance); w = strength
    glm::vec4 bias{0.002f, 0.f, 1.f, 0.02f};  // w=directional source angular radius
    glm::vec4 cascadeBias{0.f};             // xyz = per-cascade NDC compare bias
    glm::vec4 cascadeTexel{0.f};            // xyz = world units per shadow texel
    glm::mat4 localVP[ShadowConfig::kLocalSlots]{};
    glm::vec4 localSlot01{-1.f, -1.f, -1.f, -1.f};
    glm::vec4 localSlot23{-1.f, -1.f, -1.f, -1.f};
    glm::vec4 localBias{0.002f};
    glm::vec4 localMeta{0.f, 1.f, 0.f, 0.f};
};
 
struct ShadowUpload {
    ShadowUBO ubo{};
    bool active = false;
};
 
EVENGINE_API_BACKENDS ShadowUpload buildDirectionalCSM(const glm::vec3 &lightDirTowardSurface, const glm::vec3 &eye,
                                                       const glm::vec3 &target, const glm::vec3 &up, float fovYRad,
                                                       float aspect, float nearZ, float farZ, float bias,
                                                       float strength);
 
}  // namespace eve::graphics