metaforce/Runtime/World/CFluidPlaneCPU.hpp

#ifndef __URDE_CFLUIDPLANECPU_HPP__
#define __URDE_CFLUIDPLANECPU_HPP__

#include "CFluidPlane.hpp"
#include "CRipple.hpp"
#include "Graphics/Shaders/CFluidPlaneShader.hpp"

namespace urde
{
class CFluidUVMotion;
class CFluidPlaneCPU final : public CFluidPlane
{
    class CTurbulence
    {
        float x0_speed;
        float x4_distance;
        float x8_freqMax;
        float xc_freqMin;
        float x10_phaseMax;
        float x14_phaseMin;
        float x18_amplitudeMax;
        float x1c_amplitudeMin;
        std::unique_ptr<float[]> x20_table; // x140
        u32 x24_tableCount = 0; // x144
        float x28_heightSelPitch = 0.f; // x148
        float x2c_ooTurbSpeed; // x14c
        float x30_ooTurbDistance; // x150
        bool x34_hasTurbulence = false; // x154
    public:
        CTurbulence(float speed, float distance, float freqMax, float freqMin,
                    float phaseMax, float phaseMin, float amplitudeMax, float amplitudeMin);
        float GetHeight(float sel) const { return x20_table[(x24_tableCount - 1) & int(sel * x28_heightSelPitch)]; }
        float GetOODistance() const { return x30_ooTurbDistance; }
        float GetOOSpeed() const { return x2c_ooTurbSpeed; }
        bool HasTurbulence() const { return x34_hasTurbulence; }
    };

    CAssetId xa0_texIdBumpMap;
    CAssetId xa4_texIdEnvMap;
    CAssetId xa8_texIdEnvBumpMap;
    CAssetId xac_texId4;
    std::experimental::optional<TLockedToken<CTexture>> xb0_bumpMap;
    std::experimental::optional<TLockedToken<CTexture>> xc0_envMap;
    std::experimental::optional<TLockedToken<CTexture>> xd0_envBumpMap;
    std::experimental::optional<TLockedToken<CTexture>> xe0_lightmap;
    zeus::CVector3f xf0_bumpLightDir;
    float xfc_bumpScale;
    float x100_tileSize;
    int x104_tileSubdivisions;
    float x108_rippleResolution;
    float x10c_specularMin;
    float x110_specularMax;
    float x114_reflectionBlend;
    float x118_reflectionSize;
    float x11c_unitsPerLightmapTexel;
    CTurbulence x120_turbulence;

    u32 m_maxVertCount;

    mutable std::vector<CFluidPlaneShader::Vertex> m_verts;
    mutable std::experimental::optional<CFluidPlaneShader> m_shader;
    mutable bool m_cachedDoubleLightmapBlend;
    mutable bool m_cachedAdditive;
public:
    CFluidPlaneCPU(CAssetId texPattern1, CAssetId texPattern2, CAssetId texColor, CAssetId bumpMap, CAssetId envMap, CAssetId envBumpMap,
                   CAssetId lightMap, float unitsPerLightmapTexel, float tileSize, u32 tileSubdivisions,
                   EFluidType fluidType, float alpha, const zeus::CVector3f& bumpLightDir, float bumpScale,
                   const CFluidUVMotion& mot, float turbSpeed, float turbDistance, float turbFreqMax,
                   float turbFreqMin, float turbPhaseMax, float turbPhaseMin, float turbAmplitudeMax,
                   float turbAmplitudeMin, float specularMin, float specularMax, float reflectionBlend,
                   float reflectionSize, float rippleIntensity, u32 maxVertCount);
    void CreateRipple(const CRipple& ripple, CStateManager& mgr);
    void CalculateLightmapMatrix(const zeus::CTransform& areaXf, const zeus::CTransform& xf,
                                 const zeus::CAABox& aabb, zeus::CMatrix4f& mtxOut) const;
    CFluidPlaneShader::RenderSetupInfo RenderSetup(const CStateManager& mgr, float, const zeus::CTransform& xf,
                                                   const zeus::CTransform& areaXf, const zeus::CAABox& aabb,
                                                   const CScriptWater* water) const;
    void Render(const CStateManager& mgr, float alpha, const zeus::CAABox& aabb, const zeus::CTransform& xf,
                const zeus::CTransform& areaXf, bool noNormals, const zeus::CFrustum& frustum,
                const std::experimental::optional<CRippleManager>& rippleManager, TUniqueId waterId,
                const bool* gridFlags, u32 gridDimX, u32 gridDimY, const zeus::CVector3f& areaCenter) const;
    float GetReflectionBlend() const { return x114_reflectionBlend; }
    float GetSpecularMax() const { return x110_specularMax; }
    float GetSpecularMin() const { return x10c_specularMin; }
    float GetReflectionSize() const { return x118_reflectionSize; }
    float GetBumpScale() const { return xfc_bumpScale; }
    bool HasBumpMap() const { return xb0_bumpMap.operator bool(); }
    const CTexture& GetBumpMap() const { return **xb0_bumpMap; }
    bool HasEnvMap() const { return xc0_envMap.operator bool(); }
    const CTexture& GetEnvMap() const { return **xc0_envMap; }
    bool HasEnvBumpMap() const { return xd0_envBumpMap.operator bool(); }
    const CTexture& GetEnvBumpMap() const { return **xd0_envBumpMap; }
    bool HasLightMap() const { return xe0_lightmap.operator bool(); }
    const CTexture& GetLightMap() const { return **xe0_lightmap; }
    const zeus::CVector3f& GetBumpLightDir() const { return xf0_bumpLightDir; }
    float GetTileSize() const { return x100_tileSize; }
    int GetTileSubdivisions() const { return x104_tileSubdivisions; }
    float GetRippleResolution() const { return x108_rippleResolution; }
    float GetTurbulenceHeight(float sel) const { return x120_turbulence.GetHeight(sel); }
    float GetOOTurbulenceDistance() const { return x120_turbulence.GetOODistance(); }
    float GetOOTurbulenceSpeed() const { return x120_turbulence.GetOOSpeed(); }
    bool HasTurbulence() const { return x120_turbulence.HasTurbulence(); }
};

class CFluidPlaneCPURender
{
public:
    enum class NormalMode
    {
        None,
        NoNormals,
        Normals,
        NBT
    };

    static int numTilesInHField;
    static int numSubdivisionsInTile;
    static int numSubdivisionsInHField;

    struct SPatchInfo
    {
        u8 x0_xSubdivs, x1_ySubdivs;
        zeus::CVector2f x4_localMin, xc_globalMin;
        float x14_tileSize;
        float x18_rippleResolution;
        float x1c_tileHypRadius;
        float x20_ooTileSize;
        float x24_ooRippleResolution;
        u16 x28_tileX;
        u16 x2a_gridDimX;
        u16 x2c_gridDimY;
        u16 x2e_tileY;
        const bool* x30_gridFlags;
        u8 x34_redShift;
        u8 x35_greenShift;
        u8 x36_blueShift;
        NormalMode x37_normalMode;
        float x38_wavecapIntensityScale;
    public:
        SPatchInfo(const zeus::CVector3f& localMin, const zeus::CVector3f& localMax, const zeus::CVector3f& pos,
                   float rippleResolution, float tileSize, float wavecapIntensityScale, int numSubdivisionsInHField,
                   NormalMode normalMode, int redShift, int greenShift, int blueShift, u32 tileX, u32 gridDimX,
                   u32 gridDimY, u32 tileY, const bool* gridFlags)
        {
            x0_xSubdivs = std::min(s16((localMax.x - localMin.x) / rippleResolution + 1.f - FLT_EPSILON) + 2,
                                   numSubdivisionsInHField + 2);
            x1_ySubdivs = std::min(s16((localMax.y - localMin.y) / rippleResolution + 1.f - FLT_EPSILON) + 2,
                                   numSubdivisionsInHField + 2);
            float tileHypRadius = tileSize * tileSize * 2 * 0.25f;
            x4_localMin.x = localMin.x;
            x4_localMin.y = localMin.y;
            xc_globalMin = x4_localMin + zeus::CVector2f(pos.x, pos.y);
            x14_tileSize = tileSize;
            x18_rippleResolution = rippleResolution;
            if (tileHypRadius != 0.f)
                tileHypRadius = std::sqrt(tileHypRadius);
            x1c_tileHypRadius = tileHypRadius;
            x20_ooTileSize = 1.f / x14_tileSize;
            x24_ooRippleResolution = 1.f / x18_rippleResolution;
            x28_tileX = u16(tileX);
            x2a_gridDimX = u16(gridDimX);
            x2c_gridDimY = u16(gridDimY);
            x2e_tileY = u16(tileY);
            x30_gridFlags = gridFlags;
            x34_redShift = u8(redShift);
            x35_greenShift = u8(greenShift);
            x36_blueShift = u8(blueShift);
            x37_normalMode = normalMode;
            x38_wavecapIntensityScale = wavecapIntensityScale;
        }
    };

    struct SRippleInfo
    {
        const CRipple& x0_ripple;
        int x4_fromX;
        int x8_toX;
        int xc_fromY;
        int x10_toY;
        int x14_gfromX;
        int x18_gtoX;
        int x1c_gfromY;
        int x20_gtoY;
    public:
        SRippleInfo(const CRipple& ripple, int fromX, int toX, int fromY, int toY)
            : x0_ripple(ripple), x14_gfromX(fromX), x18_gtoX(toX), x1c_gfromY(fromY), x20_gtoY(toY) {}
    };

    struct SHFieldSample
    {
        float height;
        s8 nx;
        s8 ny;
        s8 nz;
        u8 wavecapIntensity;

        zeus::CVector3f MakeNormal() const { return {nx / 63.f, ny / 63.f, nz / 63.f}; }
        zeus::CVector3f MakeBinormal() const { return {nx / 63.f, nz / 63.f, -ny / 63.f}; }
        zeus::CVector3f MakeTangent() const { return {nz / 63.f, ny / 63.f, -nx / 63.f}; }
        zeus::CColor MakeColor(const CFluidPlaneCPURender::SPatchInfo& info) const
        {
            return {(wavecapIntensity >> info.x34_redShift) / 255.f,
                    (wavecapIntensity >> info.x35_greenShift) / 255.f,
                    (wavecapIntensity >> info.x36_blueShift) / 255.f};
        }
    };
};

void RenderPatch(const CFluidPlaneCPURender::SPatchInfo& info,
                 const CFluidPlaneCPURender::SHFieldSample (&heights)[46][46],
                 const u8 (&flags)[9][9], bool noRipples, bool flagIs1,
                 std::vector<CFluidPlaneShader::Vertex>& vOut);

}

#endif // __URDE_CFLUIDPLANECPU_HPP__