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Clean up #defines

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Evgenii Golubev 8 年前
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共有 1 个文件被更改，包括 75 次插入 和 73 次删除
  1. 148
      Assets/ScriptableRenderPipeline/ShaderLibrary/AreaLighting.hlsl

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Assets/ScriptableRenderPipeline/ShaderLibrary/AreaLighting.hlsl
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#ifndef UNITY_AREA_LIGHTING_INCLUDED
#define UNITY_AREA_LIGHTING_INCLUDED
#define SPHERE_LIGHT_APPROXIMATION
#define APPROXIMATE_POLY_LIGHT_AS_SPHERE_LIGHT
#define APPROXIMATE_SPHERE_LIGHT_NUMERICALLY
// Not normalized by the factor of 1/TWO_PI.
float3 ComputeEdgeFactor(float3 V1, float3 V2)

// N.b.: this function accounts for horizon clipping.
float DiffuseSphereLightIrradiance(float sinSqSigma, float cosOmega)
{
#if 1 // Use a numerical fit for the sphere light approximation found in Mathematica.
#ifdef APPROXIMATE_SPHERE_LIGHT_NUMERICALLY
// For most of the domain, the absolute error is pretty low, under 0.005.
// You can use the following Mathematica code to reproduce our results:
// t = Flatten[Table[{x, y, f[x, y]}, {x, 0, 0.999999, 0.001}, {y, -0.999999, 0.999999, 0.002}], 1]
// m = NonlinearModelFit[t, x * (y + e) * (0.5 + (y - e) * (a + b * x + c * x^2 + d * x^3)), {a, b, c, d, e}, {x, y}]
return saturate(x * (0.9245867471551246 + y) * (0.5 + (-0.9245867471551246 + y) * (0.5359050373687144 + x * (-1.0054221851257754 + x * (1.8199061187417047 - x * 1.3172081704209504)))));
#if 1
// Use a numerical fit found in Mathematica.
// For most of the domain, the absolute error is fairly low, under 0.005.
// You can use the following Mathematica code to reproduce our results:
// t = Flatten[Table[{x, y, f[x, y]}, {x, 0, 0.999999, 0.001}, {y, -0.999999, 0.999999, 0.002}], 1]
// m = NonlinearModelFit[t, x * (y + e) * (0.5 + (y - e) * (a + b * x + c * x^2 + d * x^3)), {a, b, c, d, e}, {x, y}]
return saturate(x * (0.9245867471551246 + y) * (0.5 + (-0.9245867471551246 + y) * (0.5359050373687144 + x * (-1.0054221851257754 + x * (1.8199061187417047 - x * 1.3172081704209504)))));
#else
// Another fit found with Mathematica. The absolute error is larger (around 0.02 on average), but the function is very smooth.
// You can use the following Mathematica code to reproduce our results:
// t = Flatten[Table[{x, y, f[x, y]}, {x, 0, 0.999999, 0.001}, {y, -0.999999, 0.999999, 0.002}], 1]
// m = NonlinearModelFit[t, 1 - (1 - x)^(a * (y + 1) + b * (y + 1)^2 + c * (y + 1)^3 + d * (y + 1)^4)}, {a, b, c, d}, {x, y}]
float p = saturate(0.14506085844485772 + y * (0.2858221675641456 + y * (0.23405929637528905 + y * (0.20682928702038633 + y * 0.1135312997643852))));
return saturate(1 - pow(1 - x, p));
#endif
float x = sinSqSigma;
float y = cosOmega;
// Another fit found with Mathematica. The error is larger (around 0.02 on average), but the function is very smooth.
// You can use the following Mathematica code to reproduce our results:
// t = Flatten[Table[{x, y, f[x, y]}, {x, 0, 0.999999, 0.001}, {y, -0.999999, 0.999999, 0.002}], 1]
// m = NonlinearModelFit[t, 1 - (1 - x)^(a * (y + 1) + b * (y + 1)^2 + c * (y + 1)^3 + d * (y + 1)^4)}, {a, b, c, d}, {x, y}]
float p = saturate(0.14506085844485772 + y * (0.2858221675641456 + y * (0.23405929637528905 + y * (0.20682928702038633 + y * 0.1135312997643852))));
return saturate(1 - pow(1 - x, p));
#endif
#if 0 // Ref: Area Light Sources for Real-Time Graphics, page 4 (1996).
float sinSqOmega = saturate(1 - cosOmega * cosOmega);
float cosSqSigma = saturate(1 - sinSqSigma);
float sinSqGamma = saturate(cosSqSigma / sinSqOmega);
float cosSqGamma = saturate(1 - sinSqGamma);
#if 0 // Ref: Area Light Sources for Real-Time Graphics, page 4 (1996).
float sinSqOmega = saturate(1 - cosOmega * cosOmega);
float cosSqSigma = saturate(1 - sinSqSigma);
float sinSqGamma = saturate(cosSqSigma / sinSqOmega);
float cosSqGamma = saturate(1 - sinSqGamma);
float sinSigma = sqrt(sinSqSigma);
float sinGamma = sqrt(sinSqGamma);
float cosGamma = sqrt(cosSqGamma);
float sinSigma = sqrt(sinSqSigma);
float sinGamma = sqrt(sinSqGamma);
float cosGamma = sqrt(cosSqGamma);
float sigma = asin(sinSigma);
float omega = acos(cosOmega);
float gamma = asin(sinGamma);
float sigma = asin(sinSigma);
float omega = acos(cosOmega);
float gamma = asin(sinGamma);
if (omega >= HALF_PI + sigma)
{
// Full horizon occlusion (case #4).
return 0;
}
float e = sinSqSigma * cosOmega;
if (omega >= HALF_PI + sigma)
{
// Full horizon occlusion (case #4).
return 0;
}
[branch]
if (omega < HALF_PI - sigma)
{
// No horizon occlusion (case #1).
return e;
}
else
{
float g = (-2 * sqrt(sinSqOmega * cosSqSigma) + sinGamma) * cosGamma + (HALF_PI - gamma);
float h = cosOmega * (cosGamma * sqrt(saturate(sinSqSigma - cosSqGamma)) + sinSqSigma * asin(saturate(cosGamma / sinSigma)));
float e = sinSqSigma * cosOmega;
if (omega < HALF_PI)
[branch]
if (omega < HALF_PI - sigma)
// Partial horizon occlusion (case #2).
return saturate(e + INV_PI * (g - h));
// No horizon occlusion (case #1).
return e;
// Partial horizon occlusion (case #3).
return saturate(INV_PI * (g + h));
float g = (-2 * sqrt(sinSqOmega * cosSqSigma) + sinGamma) * cosGamma + (HALF_PI - gamma);
float h = cosOmega * (cosGamma * sqrt(saturate(sinSqSigma - cosSqGamma)) + sinSqSigma * asin(saturate(cosGamma / sinSigma)));
if (omega < HALF_PI)
{
// Partial horizon occlusion (case #2).
return saturate(e + INV_PI * (g - h));
}
else
{
// Partial horizon occlusion (case #3).
return saturate(INV_PI * (g + h));
}
}
#else // Ref: Moving Frostbite to Physically Based Rendering, page 47 (2015, optimized).
float cosSqOmega = cosOmega * cosOmega; // y^2
#else // Ref: Moving Frostbite to Physically Based Rendering, page 47 (2015, optimized).
float cosSqOmega = cosOmega * cosOmega; // y^2
[branch]
if (cosSqOmega > sinSqSigma) // (y^2)>x
{
return saturate(sinSqSigma * cosOmega); // Clip[x*y,{0,1}]
}
else
{
float cotSqSigma = rcp(sinSqSigma) - 1; // 1/x-1
float tanSqSigma = rcp(cotSqSigma); // x/(1-x)
float sinSqOmega = 1 - cosSqOmega; // 1-y^2
[branch]
if (cosSqOmega > sinSqSigma) // (y^2)>x
{
return saturate(sinSqSigma * cosOmega); // Clip[x*y,{0,1}]
}
else
{
float cotSqSigma = rcp(sinSqSigma) - 1; // 1/x-1
float tanSqSigma = rcp(cotSqSigma); // x/(1-x)
float sinSqOmega = 1 - cosSqOmega; // 1-y^2
float w = sinSqOmega * tanSqSigma; // (1-y^2)*(x/(1-x))
float x = -cosOmega * rsqrt(w); // -y*Sqrt[(1/x-1)/(1-y^2)]
float y = sqrt(sinSqOmega * tanSqSigma - cosSqOmega); // Sqrt[(1-y^2)*(x/(1-x))-y^2]
float z = y * cotSqSigma; // Sqrt[(1-y^2)*(x/(1-x))-y^2]*(1/x-1)
float w = sinSqOmega * tanSqSigma; // (1-y^2)*(x/(1-x))
float x = -cosOmega * rsqrt(w); // -y*Sqrt[(1/x-1)/(1-y^2)]
float y = sqrt(sinSqOmega * tanSqSigma - cosSqOmega); // Sqrt[(1-y^2)*(x/(1-x))-y^2]
float z = y * cotSqSigma; // Sqrt[(1-y^2)*(x/(1-x))-y^2]*(1/x-1)
float a = cosOmega * acos(x) - z; // y*ArcCos[-y*Sqrt[(1/x-1)/(1-y^2)]]-Sqrt[(1-y^2)*(x/(1-x))-y^2]*(1/x-1)
float b = atan(y); // ArcTan[Sqrt[(1-y^2)*(x/(1-x))-y^2]]
float a = cosOmega * acos(x) - z; // y*ArcCos[-y*Sqrt[(1/x-1)/(1-y^2)]]-Sqrt[(1-y^2)*(x/(1-x))-y^2]*(1/x-1)
float b = atan(y); // ArcTan[Sqrt[(1-y^2)*(x/(1-x))-y^2]]
// Replacing max() with saturate() results in a 12 cycle SGPR forwarding stall on PS4.
return max(INV_PI * (a * sinSqSigma + b), 0); // (a/Pi)*x+(b/Pi)
}
// Replacing max() with saturate() results in a 12 cycle SGPR forwarding stall on PS4.
return max(INV_PI * (a * sinSqSigma + b), 0); // (a/Pi)*x+(b/Pi)
}
#endif
#endif
}

#ifdef SPHERE_LIGHT_APPROXIMATION
#ifdef APPROXIMATE_POLY_LIGHT_AS_SPHERE_LIGHT
[unroll]
for (uint i = 0; i < 4; i++)
{

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