metaforce/Runtime/Graphics/Shaders/CModelShaders.hpp

#pragma once

#include "hecl/Runtime.hpp"
#include "hecl/Backend/Backend.hpp"
#include "optional.hpp"
#include "zeus/CVector3f.hpp"
#include "zeus/CColor.hpp"
#include "Graphics/CGraphics.hpp"

#define URDE_MAX_LIGHTS 8

namespace urde
{

enum EExtendedShader : uint8_t
{
    Flat,
    Lighting,
    Thermal,
    ForcedAlpha,
    ForcedAdditive,
    SolidColor,
    SolidColorAdditive,
    SolidColorFrontfaceCullLEqualAlphaOnly,
    SolidColorFrontfaceCullAlwaysAlphaOnly, // No Z-write or test
    SolidColorBackfaceCullLEqualAlphaOnly,
    SolidColorBackfaceCullGreaterAlphaOnly, // No Z-write
    MorphBallShadow,
    WorldShadow,
    ForcedAlphaNoCull,
    ForcedAdditiveNoCull,
    ForcedAlphaNoZWrite,
    ForcedAdditiveNoZWrite,
    ForcedAlphaNoCullNoZWrite,
    ForcedAdditiveNoCullNoZWrite,
    DepthGEqualNoZWrite,
    MAX
};

class CModelShaders
{
    friend class CModel;
public:
    struct Light
    {
        zeus::CVector3f pos;
        zeus::CVector3f dir;
        zeus::CColor color = zeus::CColor::skClear;
        float linAtt[4] = {1.f, 0.f, 0.f};
        float angAtt[4] = {1.f, 0.f, 0.f};
    };

    struct LightingUniform
    {
        Light lights[URDE_MAX_LIGHTS];
        zeus::CColor ambient;
        zeus::CColor colorRegs[3];
        zeus::CColor mulColor;
        CGraphics::CFogState fog;

        void ActivateLights(const std::vector<CLight>& lts);
    };

    struct ThermalUniform
    {
        zeus::CColor mulColor;
        zeus::CColor addColor;
    };

    struct SolidUniform
    {
        zeus::CColor solidColor;
    };

    struct MBShadowUniform
    {
        zeus::CVector4f shadowUp;
        float shadowId;
    };

    static void Initialize();
    static void Shutdown();

    using ShaderPipelinesData = std::array<boo::ObjToken<boo::IShaderPipeline>, EExtendedShader::MAX>;
    using ShaderPipelines = std::shared_ptr<ShaderPipelinesData>;

    static ShaderPipelines BuildExtendedShader(const hecl::Backend::ShaderTag& tag,
                                               const hecl::Frontend::IR& ir);

private:
    static std::unordered_map<uint64_t, ShaderPipelines> g_ShaderPipelines;
};

}