irradiance_volume.h

#pragma once
 
#include <cstdint>
 
#include <glm/glm.hpp>
 
#include "core/reflect.h"
#include "ecs/entity.h"
 
namespace Vkm::Engine {
 
class Scene;

struct IrradianceVolume {
    static constexpr uint32_t MAX_RESOLUTION = 64;
 
    glm::vec3 halfExtents = glm::vec3(10.0f, 5.0f, 10.0f);  
 
    // Probe counts per axis.
    uint32_t resolutionX = 8;
    uint32_t resolutionY = 4;
    uint32_t resolutionZ = 8;
 
    float intensity = 1.0f;  

    float blendDistance = 1.0f;

    uint32_t bakeVersion = 0;

    static glm::uvec3 clampedResolution(const IrradianceVolume& volume) {
        const auto axis = [](uint32_t asked) {
            return asked > MAX_RESOLUTION ? MAX_RESOLUTION : asked;
        };
        return glm::uvec3(axis(volume.resolutionX), axis(volume.resolutionY), axis(volume.resolutionZ));
    }
};

EntityId findIrradianceVolume(const Scene& scene);
 
} // namespace Vkm::Engine
 
VKM_REFLECT_BEGIN(::Vkm::Engine::IrradianceVolume)
    VKM_F(halfExtents)
    VKM_F(resolutionX)
    VKM_F(resolutionY)
    VKM_F(resolutionZ)
    VKM_F(intensity)
    VKM_F(blendDistance)
    VKM_F(bakeVersion)
VKM_REFLECT_END()