#include "CModelShaders.hpp"

namespace urde
{
using namespace std::literals;

extern const hecl::Backend::Function ExtensionLightingFuncsHLSL[];
extern const hecl::Backend::Function ExtensionPostFuncsHLSL[];

static std::string_view LightingHLSL =
"struct Light\n"
"{\n"
"    float4 pos;\n"
"    float4 dir;\n"
"    float4 color;\n"
"    float4 linAtt;\n"
"    float4 angAtt;\n"
"};\n"
"struct Fog\n"
"{\n"
"    int mode;\n"
"    float4 color;\n"
"    float rangeScale;\n"
"    float start;\n"
"};\n"
"\n"
"cbuffer LightingUniform : register(b2)\n"
"{\n"
"    Light lights[" _XSTR(URDE_MAX_LIGHTS) "];\n"
"    float4 ambient;\n"
"    float4 colorReg0;\n"
"    float4 colorReg1;\n"
"    float4 colorReg2;\n"
"    float4 mulColor;\n"
"    Fog fog;\n"
"};\n"
"\n"
"static float4 LightingFunc(float3 mvPosIn, float3 mvNormIn, in VertToFrag vtf)\n"
"{\n"
"    float4 ret = ambient;\n"
"    \n"
"    for (int i=0 ; i<" _XSTR(URDE_MAX_LIGHTS) " ; ++i)\n"
"    {\n"
"        float3 delta = mvPosIn - lights[i].pos.xyz;\n"
"        float dist = length(delta);\n"
"        float angDot = saturate(dot(normalize(delta), lights[i].dir.xyz));\n"
"        float att = 1.0 / (lights[i].linAtt[2] * dist * dist +\n"
"                           lights[i].linAtt[1] * dist +\n"
"                           lights[i].linAtt[0]);\n"
"        float angAtt = lights[i].angAtt[2] * angDot * angDot +\n"
"                       lights[i].angAtt[1] * angDot +\n"
"                       lights[i].angAtt[0];\n"
"        ret += lights[i].color * saturate(angAtt) * att * saturate(dot(normalize(-delta), mvNormIn));\n"
"    }\n"
"    \n"
"    return ret;\n"
"}\n"sv;

static std::string_view LightingShadowHLSL =
"struct Light\n"
"{\n"
"    float4 pos;\n"
"    float4 dir;\n"
"    float4 color;\n"
"    float4 linAtt;\n"
"    float4 angAtt;\n"
"};\n"
"struct Fog\n"
"{\n"
"    int mode;\n"
"    float4 color;\n"
"    float rangeScale;\n"
"    float start;\n"
"};\n"
"\n"
"cbuffer LightingUniform : register(b2)\n"
"{\n"
"    Light lights[" _XSTR(URDE_MAX_LIGHTS) "];\n"
"    float4 ambient;\n"
"    float4 colorReg0;\n"
"    float4 colorReg1;\n"
"    float4 colorReg2;\n"
"    float4 mulColor;\n"
"    Fog fog;\n"
"};\n"
"\n"
"static float4 LightingShadowFunc(float3 mvPosIn, float3 mvNormIn, in VertToFrag vtf)\n"
"{\n"
"    float4 ret = ambient;\n"
"    \n"
"    float3 delta = mvPosIn - lights[0].pos.xyz;\n"
"    float dist = length(delta);\n"
"    float angDot = saturate(dot(normalize(delta), lights[0].dir.xyz));\n"
"    float att = 1.0 / (lights[0].linAtt[2] * dist * dist +\n"
"                       lights[0].linAtt[1] * dist +\n"
"                       lights[0].linAtt[0]);\n"
"    float angAtt = lights[0].angAtt[2] * angDot * angDot +\n"
"                   lights[0].angAtt[1] * angDot +\n"
"                   lights[0].angAtt[0];\n"
"    ret += lights[0].color * saturate(angAtt) * att * saturate(dot(normalize(-delta), mvNormIn)) *\n"
"           extTex7.Sample(clampSamp, vtf.extTcgs[0]).r;\n"
"    \n"
"    for (int i=1 ; i<" _XSTR(URDE_MAX_LIGHTS) " ; ++i)\n"
"    {\n"
"        float3 delta = mvPosIn - lights[i].pos.xyz;\n"
"        float dist = length(delta);\n"
"        float angDot = saturate(dot(normalize(delta), lights[i].dir.xyz));\n"
"        float att = 1.0 / (lights[i].linAtt[2] * dist * dist +\n"
"                           lights[i].linAtt[1] * dist +\n"
"                           lights[i].linAtt[0]);\n"
"        float angAtt = lights[i].angAtt[2] * angDot * angDot +\n"
"                       lights[i].angAtt[1] * angDot +\n"
"                       lights[i].angAtt[0];\n"
"        ret += lights[i].color * saturate(angAtt) * att * saturate(dot(normalize(-delta), mvNormIn));\n"
"    }\n"
"    \n"
"    return ret;\n"
"}\n"sv;

static std::string_view MainPostHLSL =
"static float4 MainPostFunc(in VertToFrag vtf, float4 colorIn)\n"
"{\n"
"    float fogZ, temp;\n"
"    switch (fog.mode)\n"
"    {\n"
"    case 2:\n"
"        fogZ = (-vtf.mvPos.z - fog.start) * fog.rangeScale;\n"
"        break;\n"
"    case 4:\n"
"        fogZ = 1.0 - exp2(-8.0 * (-vtf.mvPos.z - fog.start) * fog.rangeScale);\n"
"        break;\n"
"    case 5:\n"
"        temp = (-vtf.mvPos.z - fog.start) * fog.rangeScale;\n"
"        fogZ = 1.0 - exp2(-8.0 * temp * temp);\n"
"        break;\n"
"    case 6:\n"
"        fogZ = exp2(-8.0 * (fog.start + vtf.mvPos.z) * fog.rangeScale);\n"
"        break;\n"
"    case 7:\n"
"        temp = (fog.start + vtf.mvPos.z) * fog.rangeScale;\n"
"        fogZ = exp2(-8.0 * temp * temp);\n"
"        break;\n"
"    default:\n"
"        fogZ = 0.0;\n"
"        break;\n"
"    }\n"
"    return lerp(colorIn, fog.color, saturate(fogZ));\n"
"}\n"
"\n"sv;

static std::string_view ThermalPostHLSL =
"cbuffer ThermalUniform : register(b2)\n"
"{\n"
"    float4 tmulColor;\n"
"    float4 addColor;\n"
"};\n"
"static float4 ThermalPostFunc(in VertToFrag vtf, float4 colorIn)\n"
"{\n"
"    return float4(extTex7.Sample(samp, vtf.extTcgs[0]).rrr * tmulColor.rgb + addColor.rgb, tmulColor.a + addColor.a);\n"
"}\n"
"\n"sv;

static std::string_view SolidPostHLSL =
"cbuffer SolidUniform : register(b2)\n"
"{\n"
"    float4 solidColor;\n"
"};\n"
"static float4 SolidPostFunc(in VertToFrag vtf, float4 colorIn)\n"
"{\n"
"    return solidColor;\n"
"}\n"
"\n"sv;

static std::string_view MBShadowPostHLSL =
"cbuffer MBShadowUniform : register(b2)\n"
"{\n"
"    float4 shadowUp;\n"
"    float shadowId;\n"
"};\n"
"static float4 MBShadowPostFunc(in VertToFrag vtf, float4 colorIn)\n"
"{\n"
"    float idTexel = extTex0.Sample(samp, vtf.extTcgs[0]).a;\n"
"    float sphereTexel = extTex1.Sample(samp, vtf.extTcgs[1]).a;\n"
"    float fadeTexel = extTex2.Sample(samp, vtf.extTcgs[2]).a;\n"
"    float val = ((abs(idTexel - shadowId) < 0.001) ?\n"
"        (dot(vtf.mvNorm.xyz, shadowUp.xyz) * shadowUp.w) : 0.0) *\n"
"        sphereTexel * fadeTexel;\n"
"    return float4(0.0, 0.0, 0.0, val);\n"
"}\n"
"\n"sv;

const hecl::Backend::Function ExtensionLightingFuncsHLSL[] =
{
    {},
    {LightingHLSL, "LightingFunc"},
    {},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"},
    {},
    {},
    {},
    {},
    {},
    {},
    {},
    {LightingShadowHLSL, "LightingShadowFunc"},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"},
    {LightingHLSL, "LightingFunc"}
};

const hecl::Backend::Function ExtensionPostFuncsHLSL[] =
{
    {},
    {MainPostHLSL, "MainPostFunc"},
    {ThermalPostHLSL, "ThermalPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {SolidPostHLSL, "SolidPostFunc"},
    {SolidPostHLSL, "SolidPostFunc"},
    {SolidPostHLSL, "SolidPostFunc"},
    {SolidPostHLSL, "SolidPostFunc"},
    {SolidPostHLSL, "SolidPostFunc"},
    {SolidPostHLSL, "SolidPostFunc"},
    {MBShadowPostHLSL, "MBShadowPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
    {MainPostHLSL, "MainPostFunc"},
};

}