metaforce/Shaders/shader_CFluidPlaneShaderMetal.cpp

#include "shader_CFluidPlaneShader.hpp"

static const char* VS =
    "struct VertData\n"
    "{\n"
    "    float4 posIn [[ attribute(0) ]];\n"
    "    float4 normalIn [[ attribute(1) ]];\n"
    "    float4 binormalIn [[ attribute(2) ]];\n"
    "    float4 tangentIn [[ attribute(3) ]];\n"
    "    float4 colorIn [[ attribute(4) ]];\n"
    "};\n"
    "\n"
    "struct FluidPlaneUniform\n"
    "{\n"
    "    float4x4 mv;\n"
    "    float4x4 mvNorm;\n"
    "    float4x4 proj;\n"
    "    float4x4 texMtxs[6];\n"
    "};\n"
    "\n"
    "struct VertToFrag\n"
    "{\n"
    "    float4 pos [[ position ]];\n"
    "    float4 mvPos;\n"
    "    float4 mvNorm;\n"
    "    float4 mvBinorm;\n"
    "    float4 mvTangent;\n"
    "    float4 color;\n"
    "    float2 uv0;\n"
    "    float2 uv1;\n"
    "    float2 uv2;\n"
    "    float2 uv3;\n"
    "    float2 uv4;\n"
    "    float2 uv5;\n"
    "    float2 uv6;\n"
    "};\n"
    "\n"
    "vertex VertToFrag vmain(VertData v [[ stage_in ]],\n"
    "                        constant FluidPlaneUniform& fu [[ buffer(2) ]])\n"
    "{\n"
    "    VertToFrag vtf;\n"
    "    float4 pos = float4(v.posIn.xyz, 1.0);\n"
    "    float4 normalIn = v.normalIn;\n"
    "    vtf.mvPos = fu.mv * pos;\n"
    "    vtf.pos = fu.proj * vtf.mvPos;\n"
    "    vtf.mvNorm = fu.mvNorm * v.normalIn;\n"
    "    vtf.mvBinorm = fu.mvNorm * v.binormalIn;\n"
    "    vtf.mvTangent = fu.mvNorm * v.tangentIn;\n"
    "    vtf.color = v.colorIn;\n"
    "    vtf.uv0 = (fu.texMtxs[0] * pos).xy;\n"
    "    vtf.uv1 = (fu.texMtxs[1] * pos).xy;\n"
    "    vtf.uv2 = (fu.texMtxs[2] * pos).xy;\n"
    "%s" // Additional TCGs here
    "    return vtf;\n"
    "}\n";

static const char* TessCS =
    "struct VertData\n"
    "{\n"
    "    float4 minMaxPos [[ attribute(0) ]];\n"
    "    float4 outerLevelsIn [[ attribute(1) ]];\n"
    "    float2 innerLevelsIn [[ attribute(2) ]];\n"
    "};\n"
    "\n"
    "struct KernelPatchInfo {\n"
    "    uint numPatches; // total number of patches to process.\n"
    "                     // we need this because this value may\n"
    "                     // not be a multiple of threadgroup size.\n"
    "    ushort numPatchesInThreadGroup; // number of patches processed by a\n"
    "                                    // thread-group\n"
    "    ushort numControlPointsPerPatch;\n"
    "};\n"
    "\n"
    "kernel void\n"
    "cmain(VertData v [[ stage_in ]],\n"
    "      constant KernelPatchInfo& patchInfo [[ buffer(2) ]],\n"
    "      device MTLQuadTessellationFactorsHalf* tessellationFactorBuffer [[ buffer(3) ]],\n"
    "      ushort lID [[ thread_position_in_threadgroup ]],\n"
    "      ushort groupID [[ threadgroup_position_in_grid ]])\n"
    "{\n"
    "    uint patchGroupID = groupID * patchInfo.numPatchesInThreadGroup;\n"
    "\n"
    "    // execute the per-patch hull function\n"
    "    if (lID < patchInfo.numPatchesInThreadGroup)\n"
    "    {\n"
    "        uint patchID = patchGroupID + lID;\n"
    "        device MTLQuadTessellationFactorsHalf& patchOut = tessellationFactorBuffer[patchID];\n"
    "        for (int i=0 ; i<4 ; ++i)\n"
    "            patchOut.edgeTessellationFactor[i] = v.outerLevelsIn[i];\n"
    "        for (int i=0 ; i<2 ; ++i)\n"
    "            patchOut.insideTessellationFactor[i] = v.innerLevelsIn[i];\n"
    "    }\n"
    "}\n";

static const char* TessES =
    "struct Ripple\n"
    "{\n"
    "    float4 center; // time, distFalloff\n"
    "    float4 params; // amplitude, lookupPhase, lookupTime\n"
    "};\n"
    "\n"
    "struct FluidPlaneUniform\n"
    "{\n"
    "    float4x4 mv;\n"
    "    float4x4 mvNorm;\n"
    "    float4x4 proj;\n"
    "    float4x4 texMtxs[6];\n"
    "    Ripple ripples[20];\n"
    "    float4 colorMul;\n"
    "    float rippleNormResolution;\n"
    "};\n"
    "\n"
    "struct VertToFrag\n"
    "{\n"
    "    float4 pos [[ position ]];\n"
    "    float4 mvPos;\n"
    "    float4 mvNorm;\n"
    "    float4 mvBinorm;\n"
    "    float4 mvTangent;\n"
    "    float4 color;\n"
    "    float2 uv0;\n"
    "    float2 uv1;\n"
    "    float2 uv2;\n"
    "    float2 uv3;\n"
    "    float2 uv4;\n"
    "    float2 uv5;\n"
    "    float2 uv6;\n"
    "};\n"
    "\n"
    "struct VertData\n"
    "{\n"
    "    float4 minMaxPos [[ attribute(0) ]];\n"
    "    float4 outerLevelsIn [[ attribute(1) ]];\n"
    "    float2 innerLevelsIn [[ attribute(2) ]];\n"
    "};\n"
    "\n"
    "#define PI_X2 6.283185307179586\n"
    "\n"
    "static void ApplyRipple(constant Ripple& ripple, float2 pos, thread float& height,\n"
    "                        sampler samp, texture2d<float> RippleMap)\n"
    "{\n"
    "    float dist = length(ripple.center.xy - pos);\n"
    "    float rippleV = RippleMap.sample(samp, float2(dist * ripple.center.w, ripple.center.z), level(0.0)).r;\n"
    "    height += rippleV * ripple.params.x * sin((dist * ripple.params.y + ripple.params.z) * PI_X2);\n"
    "}\n"
    "\n"
    "[[ patch(quad, 1) ]]\n"
    "vertex VertToFrag emain(VertData v [[ stage_in ]], float2 TessCoord [[ position_in_patch ]],\n"
    "                        constant FluidPlaneUniform& fu [[ buffer(2) ]],\n"
    "                        sampler samp [[ sampler(2) ]],\n"
    "                        texture2d<float> RippleMap [[ texture(%d) ]])\n"
    "{\n"
    "    float2 posIn = float2(mix(v.minMaxPos.x, v.minMaxPos.z, TessCoord.x),\n"
    "                          mix(v.minMaxPos.y, v.minMaxPos.w, TessCoord.y));\n"
    "    float height = 0.0;\n"
    "    float upHeight = 0.0;\n"
    "    float downHeight = 0.0;\n"
    "    float rightHeight = 0.0;\n"
    "    float leftHeight = 0.0;\n"
    "    for (int i=0 ; i<20 ; ++i)\n"
    "    {\n"
    "        ApplyRipple(fu.ripples[i], posIn, height, samp, RippleMap);\n"
    "        ApplyRipple(fu.ripples[i], posIn + float2(0.0, fu.rippleNormResolution), upHeight, samp, RippleMap);\n"
    "        ApplyRipple(fu.ripples[i], posIn - float2(0.0, fu.rippleNormResolution), downHeight, samp, RippleMap);\n"
    "        ApplyRipple(fu.ripples[i], posIn + float2(fu.rippleNormResolution, 0.0), rightHeight, samp, RippleMap);\n"
    "        ApplyRipple(fu.ripples[i], posIn - float2(fu.rippleNormResolution, 0.0), leftHeight, samp, RippleMap);\n"
    "    }\n"
    "    float4 normalIn = float4(normalize(float3((leftHeight - rightHeight),\n"
    "                                              (downHeight - upHeight),\n"
    "                                              fu.rippleNormResolution)), 1.0);\n"
    "    float4 binormalIn = float4(normalIn.x, normalIn.z, -normalIn.y, 1.0);\n"
    "    float4 tangentIn = float4(normalIn.z, normalIn.y, -normalIn.x, 1.0);\n"
    "    float4 pos = float4(posIn, height, 1.0);\n"
    "    VertToFrag vtf;\n"
    "    vtf.mvPos = (fu.mv * pos);\n"
    "    vtf.pos = (fu.proj * vtf.mvPos);\n"
    "    vtf.mvNorm = (fu.mvNorm * normalIn);\n"
    "    vtf.mvBinorm = (fu.mvNorm * binormalIn);\n"
    "    vtf.mvTangent = (fu.mvNorm * tangentIn);\n"
    "    vtf.color = max(height, 0.0) * fu.colorMul;\n"
    "    vtf.color.a = 1.0;\n"
    "    vtf.uv0 = (fu.texMtxs[0] * pos).xy;\n"
    "    vtf.uv1 = (fu.texMtxs[1] * pos).xy;\n"
    "    vtf.uv2 = (fu.texMtxs[2] * pos).xy;\n"
    "%s\n" // Additional TCGs here
    "    return vtf;\n"
    "}\n";

static const char* FS =
"struct Light\n"
"{\n"
"    float4 pos;\n"
"    float4 dir;\n"
"    float4 color;\n"
"    float4 linAtt;\n"
"    float4 angAtt;\n"
"};\n"
"struct Fog\n" // Reappropriated for indirect texture scaling
"{\n"
"    int mode;\n"
"    float4 color;\n"
"    float rangeScale;\n"
"    float start;\n"
"    float indScale;\n"
"};\n"
"\n"
"struct LightingUniform\n"
"{\n"
"    Light lights[" _XSTR(URDE_MAX_LIGHTS) "];\n"
"    float4 ambient;\n"
"    float4 kColor0;\n"
"    float4 kColor1;\n"
"    float4 kColor2;\n"
"    float4 kColor3;\n"
"    Fog fog;\n"
"};\n"
"\n"
"static float4 LightingFunc(constant LightingUniform& lu, float3 mvPosIn, float3 mvNormIn)\n"
"{\n"
"    float4 ret = lu.ambient;\n"
"    \n"
"    for (int i=0 ; i<" _XSTR(URDE_MAX_LIGHTS) " ; ++i)\n"
"    {\n"
"        float3 delta = mvPosIn - lu.lights[i].pos.xyz;\n"
"        float dist = length(delta);\n"
"        float angDot = clamp(dot(normalize(delta), lu.lights[i].dir.xyz), 0.0, 1.0);\n"
"        float att = 1.0 / (lu.lights[i].linAtt[2] * dist * dist +\n"
"                           lu.lights[i].linAtt[1] * dist +\n"
"                           lu.lights[i].linAtt[0]);\n"
"        float angAtt = lu.lights[i].angAtt[2] * angDot * angDot +\n"
"                       lu.lights[i].angAtt[1] * angDot +\n"
"                       lu.lights[i].angAtt[0];\n"
"        ret += lu.lights[i].color * angAtt * att * saturate(dot(normalize(-delta), mvNormIn));\n"
"    }\n"
"    \n"
"    return saturate(ret);\n"
"}\n"
"\n"
"struct VertToFrag\n"
"{\n"
"    float4 pos [[ position ]];\n"
"    float4 mvPos;\n"
"    float4 mvNorm;\n"
"    float4 mvBinorm;\n"
"    float4 mvTangent;\n"
"    float4 color;\n"
"    float2 uv0;\n"
"    float2 uv1;\n"
"    float2 uv2;\n"
"    float2 uv3;\n"
"    float2 uv4;\n"
"    float2 uv5;\n"
"    float2 uv6;\n"
"};\n"
"\n"
"float4 MainPostFunc(thread VertToFrag& vtf, constant LightingUniform& lu, float4 colorIn)\n"
"{\n"
"    float fogZ, temp;\n"
"    switch (lu.fog.mode)\n"
"    {\n"
"    case 2:\n"
"        fogZ = (-vtf.mvPos.z - lu.fog.start) * lu.fog.rangeScale;\n"
"        break;\n"
"    case 4:\n"
"        fogZ = 1.0 - exp2(-8.0 * (-vtf.mvPos.z - lu.fog.start) * lu.fog.rangeScale);\n"
"        break;\n"
"    case 5:\n"
"        temp = (-vtf.mvPos.z - lu.fog.start) * lu.fog.rangeScale;\n"
"        fogZ = 1.0 - exp2(-8.0 * temp * temp);\n"
"        break;\n"
"    case 6:\n"
"        fogZ = exp2(-8.0 * (lu.fog.start + vtf.mvPos.z) * lu.fog.rangeScale);\n"
"        break;\n"
"    case 7:\n"
"        temp = (lu.fog.start + vtf.mvPos.z) * lu.fog.rangeScale;\n"
"        fogZ = exp2(-8.0 * temp * temp);\n"
"        break;\n"
"    default:\n"
"        fogZ = 0.0;\n"
"        break;\n"
"    }\n"
"#if %d\n"
"    return float4(mix(colorIn, float4(0.0), saturate(fogZ)).rgb, colorIn.a);\n"
"#else\n"
"    return float4(mix(colorIn, lu.fog.color, saturate(fogZ)).rgb, colorIn.a);\n"
"#endif\n"
"}\n"
"\n"
"fragment float4 fmain(VertToFrag vtf [[ stage_in ]],\n"
"                      sampler samp [[ sampler(0) ]],\n"
"                      constant LightingUniform& lu [[ buffer(4) ]]%s)\n" // Textures here
"{\n"
"    float4 lighting = LightingFunc(lu, vtf.mvPos.xyz, normalize(vtf.mvNorm.xyz));\n"
"    float4 colorOut;\n"
"%s" // Combiner expression here
"    return MainPostFunc(vtf, lu, colorOut);\n"
"}\n";

static const char* FSDoor =
"struct Light\n"
"{\n"
"    float4 pos;\n"
"    float4 dir;\n"
"    float4 color;\n"
"    float4 linAtt;\n"
"    float4 angAtt;\n"
"};\n"
"struct Fog\n" // Reappropriated for indirect texture scaling
"{\n"
"    int mode;\n"
"    float4 color;\n"
"    float rangeScale;\n"
"    float start;\n"
"    float indScale;\n"
"};\n"
"\n"
"struct LightingUniform\n"
"{\n"
"    Light lights[" _XSTR(URDE_MAX_LIGHTS) "];\n"
"    float4 ambient;\n"
"    float4 kColor0;\n"
"    float4 kColor1;\n"
"    float4 kColor2;\n"
"    float4 kColor3;\n"
"    Fog fog;\n"
"};\n"
"\n"
"struct VertToFrag\n"
"{\n"
"    float4 pos [[ position ]];\n"
"    float4 mvPos;\n"
"    float4 mvNorm;\n"
"    float4 mvBinorm;\n"
"    float4 mvTangent;\n"
"    float4 color;\n"
"    float2 uv0;\n"
"    float2 uv1;\n"
"    float2 uv2;\n"
"    float2 uv3;\n"
"    float2 uv4;\n"
"    float2 uv5;\n"
"    float2 uv6;\n"
"};\n"
"\n"
"fragment float4 fmain(VertToFrag vtf [[ stage_in ]],\n"
"                      sampler samp [[ sampler(0) ]],\n"
"                      constant LightingUniform& lu [[ buffer(4) ]]%s)\n" // Textures here
"{\n"
"    float4 colorOut;\n"
"%s" // Combiner expression here
"    return colorOut;\n"
"}\n";

static std::string _BuildFS(const SFluidPlaneShaderInfo& info) {
  std::string textures;
  std::string combiner;
  int nextTex = 0;
  int nextTCG = 3;
  int nextMtx = 4;
  int bumpMapUv, envBumpMapUv, envMapUv, lightmapUv;

  if (info.m_hasPatternTex1)
    textures += hecl::Format(",\ntexture2d<float> patternTex1 [[ texture(%d) ]]", nextTex++);
  if (info.m_hasPatternTex2)
    textures += hecl::Format(",\ntexture2d<float> patternTex2 [[ texture(%d) ]]", nextTex++);
  if (info.m_hasColorTex)
    textures += hecl::Format(",\ntexture2d<float> colorTex [[ texture(%d) ]]", nextTex++);
  if (info.m_hasBumpMap)
    textures += hecl::Format(",\ntexture2d<float> bumpMap [[ texture(%d) ]]", nextTex++);
  if (info.m_hasEnvMap)
    textures += hecl::Format(",\ntexture2d<float> envMap [[ texture(%d) ]]", nextTex++);
  if (info.m_hasEnvBumpMap)
    textures += hecl::Format(",\ntexture2d<float> envBumpMap [[ texture(%d) ]]", nextTex++);
  if (info.m_hasLightmap)
    textures += hecl::Format(",\ntexture2d<float> lightMap [[ texture(%d) ]]", nextTex++);

  if (info.m_hasBumpMap) {
    bumpMapUv = nextTCG;
  }
  if (info.m_hasEnvBumpMap) {
    envBumpMapUv = nextTCG;
  }
  if (info.m_hasEnvMap) {
    envMapUv = nextTCG;
  }
  if (info.m_hasLightmap) {
    lightmapUv = nextTCG;
  }

  switch (info.m_type) {
  case EFluidType::NormalWater:
  case EFluidType::PhazonFluid:
  case EFluidType::Four:
    if (info.m_hasLightmap) {
      combiner += hecl::Format("    float4 lightMapTexel = lightMap.sample(samp, vtf.uv%d);\n", lightmapUv);
      // 0: Tex4TCG, Tex4, doubleLightmapBlend ? NULL : GX_COLOR1A1
      // ZERO, TEX, KONST, doubleLightmapBlend ? ZERO : RAS
      // Output reg 2
      // KColor 2
      if (info.m_doubleLightmapBlend) {
        // 1: Tex4TCG2, Tex4, GX_COLOR1A1
        // C2, TEX, KONST, RAS
        // Output reg 2
        // KColor 3
        // Tex * K2 + Lighting
        combiner += "    lighting += mix(lightMapTexel * lu.kColor2, lightMapTexel, lu.kColor3);\n";
      } else {
        // mix(Tex * K2, Tex, K3) + Lighting
        combiner += "    lighting += lightMapTexel * lu.kColor2;\n";
      }
    }

    // Next: Tex0TCG, Tex0, GX_COLOR1A1
    // ZERO, TEX, KONST, RAS
    // Output reg prev
    // KColor 0

    // Next: Tex1TCG, Tex1, GX_COLOR0A0
    // ZERO, TEX, PREV, RAS
    // Output reg prev

    // Next: Tex2TCG, Tex2, GX_COLOR1A1
    // ZERO, TEX, hasTex4 ? C2 : RAS, PREV
    // Output reg prev

    // (Tex0 * kColor0 + Lighting) * Tex1 + VertColor + Tex2 * Lighting
    if (info.m_hasPatternTex2) {
      if (info.m_hasPatternTex1)
        combiner +=
            "    colorOut = (patternTex1.sample(samp, vtf.uv0) * lu.kColor0 + lighting) *\n"
            "               patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
      else
        combiner += "    colorOut = lighting * patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
    } else {
      combiner += "    colorOut = vtf.color;\n";
    }

    if (info.m_hasColorTex && !info.m_hasEnvMap && info.m_hasEnvBumpMap) {
      // Make previous stage indirect, mtx0
      combiner += hecl::Format(
          "    float2 indUvs = (envBumpMap.sample(samp, vtf.uv%d).ra - float2(0.5, 0.5)) *\n"
          "        float2(lu.fog.indScale, -lu.fog.indScale);\n",
          envBumpMapUv);
      combiner += "    colorOut += colorTex.sample(samp, indUvs + vtf.uv2) * lighting;\n";
    } else if (info.m_hasEnvMap) {
      // Next: envTCG, envTex, NULL
      // PREV, TEX, KONST, ZERO
      // Output reg prev
      // KColor 1

      // Make previous stage indirect, mtx0
      if (info.m_hasColorTex)
        combiner += "    colorOut += colorTex.sample(samp, vtf.uv2) * lighting;\n";
      combiner += hecl::Format(
          "    float2 indUvs = (envBumpMap.sample(samp, vtf.uv%d).ra - float2(0.5, 0.5)) *\n"
          "        float2(lu.fog.indScale, -lu.fog.indScale);\n",
          envBumpMapUv);
      combiner +=
          hecl::Format("    colorOut = mix(colorOut, envMap.sample(samp, indUvs + vtf.uv%d), lu.kColor1);\n", envMapUv);
    } else if (info.m_hasColorTex) {
      combiner += "    colorOut += colorTex.sample(samp, vtf.uv2) * lighting;\n";
    }

    break;

  case EFluidType::PoisonWater:
    if (info.m_hasLightmap) {
      combiner += hecl::Format("    float4 lightMapTexel = lightMap.sample(samp, vtf.uv%d);\n", lightmapUv);
      // 0: Tex4TCG, Tex4, doubleLightmapBlend ? NULL : GX_COLOR1A1
      // ZERO, TEX, KONST, doubleLightmapBlend ? ZERO : RAS
      // Output reg 2
      // KColor 2
      if (info.m_doubleLightmapBlend) {
        // 1: Tex4TCG2, Tex4, GX_COLOR1A1
        // C2, TEX, KONST, RAS
        // Output reg 2
        // KColor 3
        // Tex * K2 + Lighting
        combiner += "    lighting += mix(lightMapTexel * lu.kColor2, lightMapTexel, lu.kColor3);\n";
      } else {
        // mix(Tex * K2, Tex, K3) + Lighting
        combiner += "    lighting += lightMapTexel * lu.kColor2;\n";
      }
    }

    // Next: Tex0TCG, Tex0, GX_COLOR1A1
    // ZERO, TEX, KONST, RAS
    // Output reg prev
    // KColor 0

    // Next: Tex1TCG, Tex1, GX_COLOR0A0
    // ZERO, TEX, PREV, RAS
    // Output reg prev

    // Next: Tex2TCG, Tex2, GX_COLOR1A1
    // ZERO, TEX, hasTex4 ? C2 : RAS, PREV
    // Output reg prev

    // (Tex0 * kColor0 + Lighting) * Tex1 + VertColor + Tex2 * Lighting
    if (info.m_hasPatternTex2) {
      if (info.m_hasPatternTex1)
        combiner +=
            "    colorOut = (patternTex1.sample(samp, vtf.uv0) * lu.kColor0 + lighting) *\n"
            "               patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
      else
        combiner += "    colorOut = lighting * patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
    } else {
      combiner += "    colorOut = vtf.color;\n";
    }

    if (info.m_hasColorTex) {
      if (info.m_hasEnvBumpMap) {
        // Make previous stage indirect, mtx0
        combiner += hecl::Format(
            "    float2 indUvs = (envBumpMap.sample(samp, vtf.uv%d).ra - float2(0.5, 0.5)) *\n"
            "        float2(lu.fog.indScale, -lu.fog.indScale);\n",
            envBumpMapUv);
        combiner += "    colorOut += colorTex.sample(samp, indUvs + vtf.uv2) * lighting;\n";
      } else {
        combiner += "    colorOut += colorTex.sample(samp, vtf.uv2) * lighting;\n";
      }
    }

    break;

  case EFluidType::Lava:
    // 0: Tex0TCG, Tex0, GX_COLOR0A0
    // ZERO, TEX, KONST, RAS
    // Output reg prev
    // KColor 0

    // 1: Tex1TCG, Tex1, GX_COLOR0A0
    // ZERO, TEX, PREV, RAS
    // Output reg prev

    // 2: Tex2TCG, Tex2, NULL
    // ZERO, TEX, ONE, PREV
    // Output reg prev

    // (Tex0 * kColor0 + VertColor) * Tex1 + VertColor + Tex2
    if (info.m_hasPatternTex2) {
      if (info.m_hasPatternTex1)
        combiner +=
            "    colorOut = (patternTex1.sample(samp, vtf.uv0) * lu.kColor0 + vtf.color) *\n"
            "               patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
      else
        combiner += "    colorOut = vtf.color * patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
    } else {
      combiner += "    colorOut = vtf.color;\n";
    }

    if (info.m_hasColorTex)
      combiner += "    colorOut += colorTex.sample(samp, vtf.uv2);\n";

    if (info.m_hasBumpMap) {
      // 3: bumpMapTCG, bumpMap, NULL
      // ZERO, TEX, ONE, HALF
      // Output reg 0, no clamp, no bias

      // 4: bumpMapTCG2, bumpMap, NULL
      // ZERO, TEX, ONE, C0
      // Output reg 0, subtract, clamp, no bias

      combiner +=
          "    float3 lightVec = lu.lights[3].pos.xyz - vtf.mvPos.xyz;\n"
          "    float lx = dot(vtf.mvTangent.xyz, lightVec);\n"
          "    float ly = dot(vtf.mvBinorm.xyz, lightVec);\n";
      combiner += hecl::Format(
          "    float4 emboss1 = bumpMap.sample(samp, vtf.uv%d) + float4(0.5);\n"
          "    float4 emboss2 = bumpMap.sample(samp, vtf.uv%d + float2(lx, ly));\n",
          bumpMapUv, bumpMapUv);

      // 5: NULL, NULL, NULL
      // ZERO, PREV, C0, ZERO
      // Output reg prev, scale 2, clamp

      // colorOut * clamp(emboss1 + 0.5 - emboss2, 0.0, 1.0) * 2.0
      combiner += "colorOut *= clamp((emboss1 + float4(0.5) - emboss2) * float4(2.0), float4(0.0), float4(1.0));\n";
    }

    break;

  case EFluidType::ThickLava:
    // 0: Tex0TCG, Tex0, GX_COLOR0A0
    // ZERO, TEX, KONST, RAS
    // Output reg prev
    // KColor 0

    // 1: Tex1TCG, Tex1, GX_COLOR0A0
    // ZERO, TEX, PREV, RAS
    // Output reg prev

    // 2: Tex2TCG, Tex2, NULL
    // ZERO, TEX, ONE, PREV
    // Output reg prev

    // (Tex0 * kColor0 + VertColor) * Tex1 + VertColor + Tex2
    if (info.m_hasPatternTex2) {
      if (info.m_hasPatternTex1)
        combiner +=
            "    colorOut = (patternTex1.sample(samp, vtf.uv0) * lu.kColor0 + vtf.color) *\n"
            "               patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
      else
        combiner += "    colorOut = vtf.color * patternTex2.sample(samp, vtf.uv1) + vtf.color;\n";
    } else {
      combiner += "    colorOut = vtf.color;\n";
    }

    if (info.m_hasColorTex)
      combiner += "    colorOut += colorTex.sample(samp, vtf.uv2);\n";

    if (info.m_hasBumpMap) {
      // 3: bumpMapTCG, bumpMap, NULL
      // ZERO, TEX, PREV, ZERO
      // Output reg prev, scale 2
      combiner += hecl::Format("    float4 emboss1 = bumpMap.sample(samp, vtf.uv%d) + float4(0.5);\n", bumpMapUv);
      combiner += "colorOut *= emboss1 * float4(2.0);\n";
    }

    break;
  }

  combiner += "    colorOut.a = lu.kColor0.a;\n";

  char* finalFS;
  asprintf(&finalFS, FS, int(info.m_additive), textures.c_str(), combiner.c_str());
  std::string ret(finalFS);
  free(finalFS);
  return ret;
}

static std::string _BuildAdditionalTCGs(const SFluidPlaneShaderInfo& info) {
  std::string additionalTCGs;
  int nextTCG = 3;
  int nextMtx = 4;

  if (info.m_hasBumpMap) {
    additionalTCGs += hecl::Format("    vtf.uv%d = (fu.texMtxs[0] * pos).xy;\n", nextTCG++);
  }
  if (info.m_hasEnvBumpMap) {
    additionalTCGs += hecl::Format("    vtf.uv%d = (fu.texMtxs[3] * float4(normalIn.xyz, 1.0)).xy;\n", nextTCG++);
  }
  if (info.m_hasEnvMap) {
    additionalTCGs += hecl::Format("    vtf.uv%d = (fu.texMtxs[%d] * pos).xy;\n", nextTCG++, nextMtx++);
  }
  if (info.m_hasLightmap) {
    additionalTCGs += hecl::Format("    vtf.uv%d = (fu.texMtxs[%d] * pos).xy;\n", nextTCG++, nextMtx++);
  }

  return additionalTCGs;
}

static std::string _BuildVS(const SFluidPlaneShaderInfo& info, bool tessellation) {
  std::string additionalTCGs = _BuildAdditionalTCGs(info);

  char* finalVSs;
  asprintf(&finalVSs, VS, additionalTCGs.c_str());
  std::string ret(finalVSs);
  free(finalVSs);
  return ret;
}
template <>
std::string StageObject_CFluidPlaneShader<hecl::PlatformType::Metal, hecl::PipelineStage::Vertex>::BuildShader(
    const SFluidPlaneShaderInfo& in, bool tessellation) {
  return _BuildVS(in, tessellation);
}

template <>
std::string StageObject_CFluidPlaneShader<hecl::PlatformType::Metal, hecl::PipelineStage::Fragment>::BuildShader(
    const SFluidPlaneShaderInfo& in, bool tessellation) {
  return _BuildFS(in);
}

template <>
std::string StageObject_CFluidPlaneShader<hecl::PlatformType::Metal, hecl::PipelineStage::Control>::BuildShader(
    const SFluidPlaneShaderInfo& in, bool tessellation) {
  return TessCS;
}

static std::string BuildES(const SFluidPlaneShaderInfo& info) {
  int nextTex = 0;
  if (info.m_hasPatternTex1)
    nextTex++;
  if (info.m_hasPatternTex2)
    nextTex++;
  if (info.m_hasColorTex)
    nextTex++;
  if (info.m_hasBumpMap)
    nextTex++;
  if (info.m_hasEnvMap)
    nextTex++;
  if (info.m_hasEnvBumpMap)
    nextTex++;
  if (info.m_hasLightmap)
    nextTex++;

  std::string additionalTCGs = _BuildAdditionalTCGs(info);

  char* finalESs;
  asprintf(&finalESs, TessES, nextTex, additionalTCGs.c_str());
  std::string ret(finalESs);
  free(finalESs);

  return ret;
}

template <>
std::string StageObject_CFluidPlaneShader<hecl::PlatformType::Metal, hecl::PipelineStage::Evaluation>::BuildShader(
    const SFluidPlaneShaderInfo& in, bool tessellation) {
  return BuildES(in);
}

static std::string _BuildVS(const SFluidPlaneDoorShaderInfo& info) {
  char* finalVSs;
  asprintf(&finalVSs, VS, "");
  std::string ret(finalVSs);
  free(finalVSs);
  return ret;
}

static std::string _BuildFS(const SFluidPlaneDoorShaderInfo& info) {
  int nextTex = 0;
  std::string textures;
  std::string combiner;

  if (info.m_hasPatternTex1)
    textures += hecl::Format(",\ntexture2d<float> patternTex1 [[ texture(%d) ]]", nextTex++);
  if (info.m_hasPatternTex2)
    textures += hecl::Format(",\ntexture2d<float> patternTex2 [[ texture(%d) ]]", nextTex++);
  if (info.m_hasColorTex)
    textures += hecl::Format(",\ntexture2d<float> colorTex [[ texture(%d) ]]", nextTex++);

  // Tex0 * kColor0 * Tex1 + Tex2
  if (info.m_hasPatternTex1 && info.m_hasPatternTex2) {
    combiner +=
        "    colorOut = patternTex1.sample(samp, vtf.uv0) * lu.kColor0 *\n"
        "               patternTex2.sample(samp, vtf.uv1);\n";
  } else {
    combiner += "    colorOut = float4(0.0);\n";
  }

  if (info.m_hasColorTex) {
    combiner += "    colorOut += colorTex.sample(samp, vtf.uv2);\n";
  }

  combiner += "    colorOut.a = lu.kColor0.a;\n";

  char* finalFSs;
  asprintf(&finalFSs, FSDoor, textures.c_str(), combiner.c_str());
  std::string ret(finalFSs);
  free(finalFSs);
  return ret;
}

template <>
std::string StageObject_CFluidPlaneDoorShader<hecl::PlatformType::Metal, hecl::PipelineStage::Vertex>::BuildShader(
    const SFluidPlaneDoorShaderInfo& in) {
  return _BuildVS(in);
}

template <>
std::string StageObject_CFluidPlaneDoorShader<hecl::PlatformType::Metal, hecl::PipelineStage::Fragment>::BuildShader(
    const SFluidPlaneDoorShaderInfo& in) {
  return _BuildFS(in);
}