VolumeFluidShadowCaster.h

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#pragma once
 
#include "common/Result.h"
#include "fluids/VolumeFluid.h"
 
#include <cstdint>
#include <vector>
 
namespace eve::graphics {
class Graphics;
class Mesh;
}  // namespace eve::graphics
 
namespace eve::fluids {
 
class VolumeFluidShadowCaster final {
public:
    explicit VolumeFluidShadowCaster(graphics::Graphics& graphics);
    ~VolumeFluidShadowCaster();
    VolumeFluidShadowCaster(const VolumeFluidShadowCaster&)            = delete;
    VolumeFluidShadowCaster& operator=(const VolumeFluidShadowCaster&) = delete;
 
    [[nodiscard]] Result<void> update(const VolumeFluid& fluid, unsigned actorGroup, float radiusScale,
                                      float alpha = 1.f, unsigned maxParticles = 4096);
    [[nodiscard]] unsigned particleCount() const noexcept { return particleCount_; }
 
private:
    graphics::Graphics*                      graphics_      = nullptr;
    graphics::Mesh*                          mesh_          = nullptr;
    uint64_t                                 drawerToken_   = 0;
    unsigned                                 particleCount_ = 0;
    std::vector<VolumeFluidParticleInstance> instances_;
    std::vector<float>                       positions_;
    std::vector<float>                       normals_;
    std::vector<uint32_t>                    indices_;
};
 
}  // namespace eve::fluids