metaforce/Runtime/Graphics/CCubeMaterial.hpp

#pragma once

#include <compare>
#include <memory>
#include <vector>

#include "CToken.hpp"
#include "GCNTypes.hpp"
#include "Graphics/CTexture.hpp"
#include "IObjectStore.hpp"

namespace metaforce {
class CCubeModel;
class CCubeSurface;
struct CModelFlags;

template <typename BitType>
class Flags {
public:
  using MaskType = typename std::underlying_type<BitType>::type;

  // constructors
  constexpr Flags() noexcept : m_mask(0) {}

  constexpr Flags(BitType bit) noexcept : m_mask(static_cast<MaskType>(bit)) {}

  constexpr Flags(Flags<BitType> const& rhs) noexcept : m_mask(rhs.m_mask) {}

  constexpr explicit Flags(MaskType flags) noexcept : m_mask(flags) {}

  [[nodiscard]] constexpr bool IsSet(Flags<BitType> const bit) const noexcept { return bool(*this & bit); }

  // relational operators
  auto operator<=>(Flags<BitType> const&) const noexcept = default;

  // logical operator
  constexpr bool operator!() const noexcept { return !m_mask; }

  // bitwise operators
  constexpr Flags<BitType> operator&(Flags<BitType> const& rhs) const noexcept {
    return Flags<BitType>(m_mask & rhs.m_mask);
  }

  constexpr Flags<BitType> operator|(Flags<BitType> const& rhs) const noexcept {
    return Flags<BitType>(m_mask | rhs.m_mask);
  }

  constexpr Flags<BitType> operator^(Flags<BitType> const& rhs) const noexcept {
    return Flags<BitType>(m_mask ^ rhs.m_mask);
  }

  // assignment operators
  constexpr Flags<BitType>& operator=(Flags<BitType> const& rhs) noexcept {
    m_mask = rhs.m_mask;
    return *this;
  }

  constexpr Flags<BitType>& operator|=(Flags<BitType> const& rhs) noexcept {
    m_mask |= rhs.m_mask;
    return *this;
  }

  constexpr Flags<BitType>& operator&=(Flags<BitType> const& rhs) noexcept {
    m_mask &= rhs.m_mask;
    return *this;
  }

  constexpr Flags<BitType>& operator^=(Flags<BitType> const& rhs) noexcept {
    m_mask ^= rhs.m_mask;
    return *this;
  }

  // cast operators
  explicit constexpr operator bool() const noexcept { return m_mask != 0; }

  explicit constexpr operator MaskType() const noexcept { return m_mask; }

private:
  MaskType m_mask;
};

enum class CCubeMaterialFlagBits : u32 {
  fKonstValues = 0x8,
  fDepthSorting = 0x10,
  fAlphaTest = 0x20,
  fSamusReflection = 0x40,
  fDepthWrite = 0x80,
  fSamusReflectionSurfaceEye = 0x100,
  fShadowOccluderMesh = 0x200,
  fSamusReflectionIndirectTexture = 0x400,
  fLightmap = 0x800,
  fLightmapUvArray = 0x2000,
  fTextureSlotMask = 0xffff0000
};
using CCubeMaterialFlags = Flags<CCubeMaterialFlagBits>;

enum class CCubeMaterialVatAttribute : u32 {
  Position = 0,
  Normal = 2,
  Color0 = 4,
  Color1 = 8,
  Tex0 = 10,
  Tex1 = 12,
  Tex2 = 14,
  Tex3 = 16,
  Tex4 = 18,
  Tex5 = 20,
  Tex6 = 22,
};
enum class CCubeMaterialVatAttributeType : u32 { None = 0, Direct = 1, Index8 = 2, Index16 = 3 };
class CCubeMaterialVatFlags {
  u32 m_flags = 0;

public:
  constexpr CCubeMaterialVatFlags() noexcept = default;
  constexpr CCubeMaterialVatFlags(u32 flags) noexcept : m_flags(flags){};
  [[nodiscard]] CCubeMaterialVatAttributeType GetAttributeType(CCubeMaterialVatAttribute attribute) const noexcept {
    return CCubeMaterialVatAttributeType((m_flags >> u32(attribute)) & 0x3);
  }
  void SetAttributeType(CCubeMaterialVatAttribute attribute, CCubeMaterialVatAttributeType type) noexcept {
    m_flags &= ~(u32(0x3) << u32(attribute));
    m_flags |= u32(type) << u32(attribute);
  }
};

class CCubeMaterial {
  const u8* x0_data;

public:
  explicit CCubeMaterial(const u8* data) : x0_data(data) {}

  void SetCurrent(const CModelFlags& flags, const CCubeSurface& surface, CCubeModel& model);

  [[nodiscard]] u32 GetCompressedBlend() {
    const u32* ptr = reinterpret_cast<const u32*>(x0_data + (GetTextureCount() * 4) + 16);
    if (GetFlags() & CCubeMaterialFlagBits::fKonstValues) {
      ptr += SBig(*ptr) + 1;
    }
    return SBig(*ptr);
  }
  [[nodiscard]] CCubeMaterialFlags GetFlags() const {
    return CCubeMaterialFlags(SBig(*reinterpret_cast<const u32*>(x0_data)));
  }
  [[nodiscard]] CCubeMaterialVatFlags GetVatFlags() const {
    return SBig(*reinterpret_cast<const u32*>(x0_data + 8 + (GetTextureCount() * 4)));
  }
  [[nodiscard]] u32 GetUsedTextureSlots() const { return static_cast<u32>(GetFlags()) >> 16; }
  [[nodiscard]] u32 GetTextureCount() const { return SBig(*reinterpret_cast<const u32*>(x0_data + 4)); }
  [[nodiscard]] u32 GetVertexDesc() const {
    return SBig(*reinterpret_cast<const u32*>(x0_data + (GetTextureCount() * 4) + 8));
  }

  static void ResetCachedMaterials();
  static void EnsureViewDepStateCached(const CCubeSurface* surface);
  static void KillCachedViewDepState();

private:
  void SetCurrentBlack();

  static void SetupBlendMode(u32 blendFactors, const CModelFlags& flags, bool alphaTest);
  static void HandleDepth(u16 modelFlags, CCubeMaterialFlags matFlags);
  static u32 HandleColorChannels(u32 chanCount, u32 firstChan);
  static void HandleTev(u32 tevCur, const u8* materialDataCur, const u32* texMapTexCoordFlags, bool shadowMapsEnabled);
  static u32 HandleAnimatedUV(const u32* uvAnim, u32 texMtx, u32 pttTexMtx);
  static void HandleTransparency(u32& finalTevCount, u32& finalKColorCount, const CModelFlags& modelFlags,
                                 u32 blendFactors, u32& finalCCFlags, u32& finalACFlags);
  static u32 HandleReflection(bool usesTevReg2, u32 indTexSlot, u32 r5, u32 finalTevCount, u32 texCount, u32 tcgCount,
                              u32 finalKColorCount, u32& finalCCFlags, u32& finalACFlags);
  static void DoPassthru(u32 finalTevCount);
  static void DoModelShadow(u32 texCount, u32 tcgCount);
};
} // namespace metaforce