mirror of
https://github.com/Open-Cascade-SAS/OCCT.git
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a5a7b3185b
Update empty method guards to new style with regex (see PR). Used clang-format 18.1.8. New actions to validate code formatting is added. Update .clang-format with disabling of include sorting. It is temporary changes, then include will be sorted. Apply formatting for /src and /tools folder. The files with .hxx,.cxx,.lxx,.h,.pxx,.hpp,*.cpp extensions.
1033 lines
40 KiB
Plaintext
1033 lines
40 KiB
Plaintext
// This file has been automatically generated from resource file src/Shaders/PathtraceBase.fs
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static const char Shaders_PathtraceBase_fs[] =
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"#ifdef _MSC_VER\n"
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" #define PATH_TRACING // just for editing in MS VS\n"
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"\n"
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" #define in\n"
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" #define out\n"
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" #define inout\n"
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"\n"
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" typedef struct { float x; float y; } vec2;\n"
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" typedef struct { float x; float y; float z; } vec3;\n"
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" typedef struct { float x; float y; float z; float w; } vec4;\n"
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"#endif\n"
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"\n"
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"#ifdef PATH_TRACING\n"
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"\n"
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"///////////////////////////////////////////////////////////////////////////////////////\n"
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"// Specific data types\n"
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"\n"
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"//! Describes local space at the hit point (visualization space).\n"
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"struct SLocalSpace\n"
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"{\n"
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" //! Local X axis.\n"
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" vec3 AxisX;\n"
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"\n"
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" //! Local Y axis.\n"
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" vec3 AxisY;\n"
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"\n"
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" //! Local Z axis.\n"
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" vec3 AxisZ;\n"
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"};\n"
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"\n"
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"//! Describes material properties (BSDF).\n"
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"struct SBSDF\n"
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"{\n"
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" //! Weight of coat specular/glossy BRDF.\n"
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" vec4 Kc;\n"
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"\n"
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" //! Weight of base diffuse BRDF + base color texture index in W.\n"
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" vec4 Kd;\n"
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"\n"
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" //! Weight of base specular/glossy BRDF.\n"
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" vec4 Ks;\n"
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"\n"
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" //! Weight of base specular/glossy BTDF + metallic-roughness texture index in W.\n"
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" vec4 Kt;\n"
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"\n"
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" //! Fresnel coefficients of coat layer.\n"
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" vec3 FresnelCoat;\n"
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"\n"
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" //! Fresnel coefficients of base layer + normal map texture index in W.\n"
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" vec4 FresnelBase;\n"
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"};\n"
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"\n"
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"///////////////////////////////////////////////////////////////////////////////////////\n"
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"// Support subroutines\n"
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"\n"
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"//=======================================================================\n"
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"// function : buildLocalSpace\n"
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"// purpose : Generates local space for the given normal\n"
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"//=======================================================================\n"
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"SLocalSpace buildLocalSpace (in vec3 theNormal)\n"
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"{\n"
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" vec3 anAxisX = vec3 (theNormal.z, 0.f, -theNormal.x);\n"
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" vec3 anAxisY = vec3 (0.f, -theNormal.z, theNormal.y);\n"
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"\n"
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" float aSqrLenX = dot (anAxisX, anAxisX);\n"
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" float aSqrLenY = dot (anAxisY, anAxisY);\n"
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"\n"
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" if (aSqrLenX > aSqrLenY)\n"
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" {\n"
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" anAxisX *= inversesqrt (aSqrLenX);\n"
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" anAxisY = cross (anAxisX, theNormal);\n"
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" }\n"
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" else\n"
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" {\n"
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" anAxisY *= inversesqrt (aSqrLenY);\n"
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" anAxisX = cross (anAxisY, theNormal);\n"
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" }\n"
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"\n"
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" return SLocalSpace (anAxisX, anAxisY, theNormal);\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : toLocalSpace\n"
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"// purpose : Transforms the vector to local space from world space\n"
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"//=======================================================================\n"
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"vec3 toLocalSpace (in vec3 theVector, in SLocalSpace theSpace)\n"
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"{\n"
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" return vec3 (dot (theVector, theSpace.AxisX),\n"
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" dot (theVector, theSpace.AxisY),\n"
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" dot (theVector, theSpace.AxisZ));\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : fromLocalSpace\n"
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"// purpose : Transforms the vector from local space to world space\n"
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"//=======================================================================\n"
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"vec3 fromLocalSpace (in vec3 theVector, in SLocalSpace theSpace)\n"
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"{\n"
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" return theVector.x * theSpace.AxisX +\n"
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" theVector.y * theSpace.AxisY +\n"
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" theVector.z * theSpace.AxisZ;\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : convolve\n"
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"// purpose : Performs a linear convolution of the vector components\n"
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"//=======================================================================\n"
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"float convolve (in vec3 theVector, in vec3 theFactor)\n"
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"{\n"
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" return dot (theVector, theFactor) * (1.f / max (theFactor.x + theFactor.y + theFactor.z, "
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"1e-15f));\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : fresnelSchlick\n"
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"// purpose : Computes the Fresnel reflection formula using\n"
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"// Schlick's approximation.\n"
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"//=======================================================================\n"
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"vec3 fresnelSchlick (in float theCosI, in vec3 theSpecularColor)\n"
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"{\n"
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" return theSpecularColor + (UNIT - theSpecularColor) * pow (1.f - theCosI, 5.f);\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : fresnelDielectric\n"
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"// purpose : Computes the Fresnel reflection formula for dielectric in\n"
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"// case of circularly polarized light (Based on PBRT code).\n"
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"//=======================================================================\n"
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"float fresnelDielectric (in float theCosI,\n"
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" in float theCosT,\n"
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" in float theEtaI,\n"
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" in float theEtaT)\n"
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"{\n"
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" float aParl = (theEtaT * theCosI - theEtaI * theCosT) /\n"
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" (theEtaT * theCosI + theEtaI * theCosT);\n"
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"\n"
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" float aPerp = (theEtaI * theCosI - theEtaT * theCosT) /\n"
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" (theEtaI * theCosI + theEtaT * theCosT);\n"
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"\n"
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" return (aParl * aParl + aPerp * aPerp) * 0.5f;\n"
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"}\n"
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"\n"
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"#define ENVIRONMENT_IOR 1.f\n"
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"\n"
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"//=======================================================================\n"
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"// function : fresnelDielectric\n"
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"// purpose : Computes the Fresnel reflection formula for dielectric in\n"
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"// case of circularly polarized light (based on PBRT code)\n"
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"//=======================================================================\n"
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"float fresnelDielectric (in float theCosI, in float theIndex)\n"
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"{\n"
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" float aFresnel = 1.f;\n"
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"\n"
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" float anEtaI = theCosI > 0.f ? 1.f : theIndex;\n"
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" float anEtaT = theCosI > 0.f ? theIndex : 1.f;\n"
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"\n"
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" float aSinT2 = (anEtaI * anEtaI) / (anEtaT * anEtaT) * (1.f - theCosI * theCosI);\n"
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"\n"
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" if (aSinT2 < 1.f)\n"
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" {\n"
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" aFresnel = fresnelDielectric (abs (theCosI), sqrt (1.f - aSinT2), anEtaI, anEtaT);\n"
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" }\n"
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"\n"
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" return aFresnel;\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : fresnelConductor\n"
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"// purpose : Computes the Fresnel reflection formula for conductor in case\n"
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"// of circularly polarized light (based on PBRT source code)\n"
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"//=======================================================================\n"
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"float fresnelConductor (in float theCosI, in float theEta, in float theK)\n"
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"{\n"
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" float aTmp = 2.f * theEta * theCosI;\n"
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"\n"
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" float aTmp1 = theEta * theEta + theK * theK;\n"
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"\n"
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" float aSPerp = (aTmp1 - aTmp + theCosI * theCosI) /\n"
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" (aTmp1 + aTmp + theCosI * theCosI);\n"
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"\n"
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" float aTmp2 = aTmp1 * theCosI * theCosI;\n"
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"\n"
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" float aSParl = (aTmp2 - aTmp + 1.f) /\n"
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" (aTmp2 + aTmp + 1.f);\n"
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"\n"
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" return (aSPerp + aSParl) * 0.5f;\n"
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"}\n"
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"\n"
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"#define FRESNEL_SCHLICK -0.5f\n"
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"#define FRESNEL_CONSTANT -1.5f\n"
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"#define FRESNEL_CONDUCTOR -2.5f\n"
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"#define FRESNEL_DIELECTRIC -3.5f\n"
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"\n"
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"//=======================================================================\n"
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"// function : fresnelMedia\n"
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"// purpose : Computes the Fresnel reflection formula for general medium\n"
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"// in case of circularly polarized light.\n"
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"//=======================================================================\n"
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"vec3 fresnelMedia (in float theCosI, in vec3 theFresnel)\n"
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"{\n"
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" vec3 aFresnel;\n"
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"\n"
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" if (theFresnel.x > FRESNEL_SCHLICK)\n"
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" {\n"
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" aFresnel = fresnelSchlick (abs (theCosI), theFresnel);\n"
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" }\n"
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" else if (theFresnel.x > FRESNEL_CONSTANT)\n"
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" {\n"
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" aFresnel = vec3 (theFresnel.z);\n"
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" }\n"
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" else if (theFresnel.x > FRESNEL_CONDUCTOR)\n"
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" {\n"
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" aFresnel = vec3 (fresnelConductor (abs (theCosI), theFresnel.y, theFresnel.z));\n"
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" }\n"
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" else\n"
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" {\n"
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" aFresnel = vec3 (fresnelDielectric (theCosI, theFresnel.y));\n"
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" }\n"
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"\n"
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" return aFresnel;\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : transmitted\n"
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"// purpose : Computes transmitted direction in tangent space\n"
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"// (in case of TIR returned result is undefined!)\n"
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"//=======================================================================\n"
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"void transmitted (in float theIndex, in vec3 theIncident, out vec3 theTransmit)\n"
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"{\n"
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" // Compute relative index of refraction\n"
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" float anEta = (theIncident.z > 0.f) ? 1.f / theIndex : theIndex;\n"
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"\n"
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" // Handle total internal reflection (TIR)\n"
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" float aSinT2 = anEta * anEta * (1.f - theIncident.z * theIncident.z);\n"
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"\n"
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" // Compute direction of transmitted ray\n"
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" float aCosT = sqrt (1.f - min (aSinT2, 1.f)) * sign (-theIncident.z);\n"
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"\n"
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" theTransmit = normalize (vec3 (-anEta * theIncident.x,\n"
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" -anEta * theIncident.y,\n"
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" aCosT));\n"
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"}\n"
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"\n"
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"//////////////////////////////////////////////////////////////////////////////////////////////\n"
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"// Handlers and samplers for materials\n"
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"//////////////////////////////////////////////////////////////////////////////////////////////\n"
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"\n"
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"//=======================================================================\n"
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"// function : EvalLambertianReflection\n"
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"// purpose : Evaluates Lambertian BRDF, with cos(N, PSI)\n"
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"//=======================================================================\n"
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"float EvalLambertianReflection (in vec3 theWi, in vec3 theWo)\n"
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"{\n"
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" return (theWi.z <= 0.f || theWo.z <= 0.f) ? 0.f : theWi.z * (1.f / M_PI);\n"
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"}\n"
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"\n"
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"#define FLT_EPSILON 1.0e-5f\n"
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"\n"
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"//=======================================================================\n"
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"// function : SmithG1\n"
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"// purpose :\n"
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"//=======================================================================\n"
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"float SmithG1 (in vec3 theDirection, in vec3 theM, in float theRoughness)\n"
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"{\n"
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" float aResult = 0.f;\n"
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"\n"
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" if (dot (theDirection, theM) * theDirection.z > 0.f)\n"
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" {\n"
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" float aTanThetaM = sqrt (1.f - theDirection.z * theDirection.z) / theDirection.z;\n"
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"\n"
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" if (aTanThetaM == 0.f)\n"
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" {\n"
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" aResult = 1.f;\n"
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" }\n"
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" else\n"
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" {\n"
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" float aVal = 1.f / (theRoughness * aTanThetaM);\n"
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"\n"
|
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" // Use rational approximation to shadowing-masking function (from Mitsuba)\n"
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" aResult = (3.535f + 2.181f * aVal) / (1.f / aVal + 2.276f + 2.577f * aVal);\n"
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" }\n"
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" }\n"
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"\n"
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" return min (aResult, 1.f);\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : EvalBlinnReflection\n"
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"// purpose : Evaluates Blinn glossy BRDF, with cos(N, PSI)\n"
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"//=======================================================================\n"
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"vec3 EvalBlinnReflection (in vec3 theWi, in vec3 theWo, in vec3 theFresnel, in float "
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"theRoughness)\n"
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"{\n"
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" // calculate the reflection half-vec\n"
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" vec3 aH = normalize (theWi + theWo);\n"
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"\n"
|
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" // roughness value -> Blinn exponent\n"
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" float aPower = max (2.f / (theRoughness * theRoughness) - 2.f, 0.f);\n"
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"\n"
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" // calculate microfacet distribution\n"
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" float aD = (aPower + 2.f) * (1.f / M_2_PI) * pow (aH.z, aPower);\n"
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"\n"
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" // calculate shadow-masking function\n"
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" float aG = SmithG1 (theWo, aH, theRoughness) *\n"
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" SmithG1 (theWi, aH, theRoughness);\n"
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"\n"
|
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" // return total amount of reflection\n"
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" return (theWi.z <= 0.f || theWo.z <= 0.f) ? ZERO :\n"
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" aD * aG / (4.f * theWo.z) * fresnelMedia (dot (theWo, aH), theFresnel);\n"
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"}\n"
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"\n"
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"//=======================================================================\n"
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"// function : EvalBsdfLayered\n"
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"// purpose : Evaluates BSDF for specified material, with cos(N, PSI)\n"
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"//=======================================================================\n"
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"vec3 EvalBsdfLayered (in SBSDF theBSDF, in vec3 theWi, in vec3 theWo)\n"
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"{\n"
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"#ifdef TWO_SIDED_BXDF\n"
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" theWi.z *= sign (theWi.z);\n"
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" theWo.z *= sign (theWo.z);\n"
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"#endif\n"
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"\n"
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" vec3 aBxDF = theBSDF.Kd.rgb * EvalLambertianReflection (theWi, theWo);\n"
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"\n"
|
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" if (theBSDF.Ks.w > FLT_EPSILON)\n"
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" {\n"
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" aBxDF += theBSDF.Ks.rgb * EvalBlinnReflection (theWi, theWo, theBSDF.FresnelBase.rgb, "
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"theBSDF.Ks.w);\n"
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" }\n"
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"\n"
|
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" aBxDF *= UNIT - fresnelMedia (theWo.z, theBSDF.FresnelCoat);\n"
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"\n"
|
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" if (theBSDF.Kc.w > FLT_EPSILON)\n"
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" {\n"
|
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" aBxDF += theBSDF.Kc.rgb * EvalBlinnReflection (theWi, theWo, theBSDF.FresnelCoat, "
|
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"theBSDF.Kc.w);\n"
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" }\n"
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"\n"
|
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" return aBxDF;\n"
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"}\n"
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"\n"
|
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"//=======================================================================\n"
|
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"// function : SampleLambertianReflection\n"
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"// purpose : Samples Lambertian BRDF, W = BRDF * cos(N, PSI) / PDF(PSI)\n"
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"//=======================================================================\n"
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"vec3 SampleLambertianReflection (in vec3 theWo, out vec3 theWi, inout float thePDF)\n"
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"{\n"
|
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" float aKsi1 = RandFloat();\n"
|
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" float aKsi2 = RandFloat();\n"
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"\n"
|
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" theWi = vec3 (cos (M_2_PI * aKsi1),\n"
|
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" sin (M_2_PI * aKsi1),\n"
|
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" sqrt (1.f - aKsi2));\n"
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"\n"
|
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" theWi.xy *= sqrt (aKsi2);\n"
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"\n"
|
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"#ifdef TWO_SIDED_BXDF\n"
|
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" theWi.z *= sign (theWo.z);\n"
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"#endif\n"
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"\n"
|
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" thePDF *= theWi.z * (1.f / M_PI);\n"
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"\n"
|
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"#ifdef TWO_SIDED_BXDF\n"
|
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" return UNIT;\n"
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"#else\n"
|
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" return UNIT * step (0.f, theWo.z);\n"
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"#endif\n"
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"}\n"
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"\n"
|
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"//=======================================================================\n"
|
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"// function : SampleGlossyBlinnReflection\n"
|
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"// purpose : Samples Blinn BRDF, W = BRDF * cos(N, PSI) / PDF(PSI)\n"
|
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"// The BRDF is a product of three main terms, D, G, and F,\n"
|
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"// which is then divided by two cosine terms. Here we perform\n"
|
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"// importance sample the D part of the Blinn model; trying to\n"
|
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"// develop a sampling procedure that accounted for all of the\n"
|
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"// terms would be complex, and it is the D term that accounts\n"
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"// for most of the variation.\n"
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"//=======================================================================\n"
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"vec3 SampleGlossyBlinnReflection (in vec3 theWo, out vec3 theWi, in vec3 theFresnel, in float "
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"theRoughness, inout float thePDF)\n"
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"{\n"
|
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" float aKsi1 = RandFloat();\n"
|
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" float aKsi2 = RandFloat();\n"
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"\n"
|
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" // roughness value --> Blinn exponent\n"
|
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" float aPower = max (2.f / (theRoughness * theRoughness) - 2.f, 0.f);\n"
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"\n"
|
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" // normal from microface distribution\n"
|
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" float aCosThetaM = pow (aKsi1, 1.f / (aPower + 2.f));\n"
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"\n"
|
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" vec3 aM = vec3 (cos (M_2_PI * aKsi2),\n"
|
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" sin (M_2_PI * aKsi2),\n"
|
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" aCosThetaM);\n"
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"\n"
|
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" aM.xy *= sqrt (1.f - aCosThetaM * aCosThetaM);\n"
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"\n"
|
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" // calculate PDF of sampled direction\n"
|
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" thePDF *= (aPower + 2.f) * (1.f / M_2_PI) * pow (aCosThetaM, aPower + 1.f);\n"
|
|
"\n"
|
|
"#ifdef TWO_SIDED_BXDF\n"
|
|
" bool toFlip = theWo.z < 0.f;\n"
|
|
"\n"
|
|
" if (toFlip)\n"
|
|
" theWo.z = -theWo.z;\n"
|
|
"#endif\n"
|
|
"\n"
|
|
" float aCosDelta = dot (theWo, aM);\n"
|
|
"\n"
|
|
" // pick input based on half direction\n"
|
|
" theWi = -theWo + 2.f * aCosDelta * aM;\n"
|
|
"\n"
|
|
" if (theWi.z <= 0.f || theWo.z <= 0.f)\n"
|
|
" {\n"
|
|
" return ZERO;\n"
|
|
" }\n"
|
|
"\n"
|
|
" // Jacobian of half-direction mapping\n"
|
|
" thePDF /= 4.f * aCosDelta;\n"
|
|
"\n"
|
|
" // compute shadow-masking coefficient\n"
|
|
" float aG = SmithG1 (theWo, aM, theRoughness) *\n"
|
|
" SmithG1 (theWi, aM, theRoughness);\n"
|
|
"\n"
|
|
"#ifdef TWO_SIDED_BXDF\n"
|
|
" if (toFlip)\n"
|
|
" theWi.z = -theWi.z;\n"
|
|
"#endif\n"
|
|
"\n"
|
|
" return (aG * aCosDelta) / (theWo.z * aM.z) * fresnelMedia (aCosDelta, theFresnel);\n"
|
|
"}\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : BsdfPdfLayered\n"
|
|
"// purpose : Calculates BSDF of sampling input knowing output\n"
|
|
"//=======================================================================\n"
|
|
"float BsdfPdfLayered (in SBSDF theBSDF, in vec3 theWo, in vec3 theWi, in vec3 theWeight)\n"
|
|
"{\n"
|
|
" float aPDF = 0.f; // PDF of sampling input direction\n"
|
|
"\n"
|
|
" // We choose whether the light is reflected or transmitted\n"
|
|
" // by the coating layer according to the Fresnel equations\n"
|
|
" vec3 aCoatF = fresnelMedia (theWo.z, theBSDF.FresnelCoat);\n"
|
|
"\n"
|
|
" // Coat BRDF is scaled by its Fresnel reflectance term. For\n"
|
|
" // reasons of simplicity we scale base BxDFs only by coat's\n"
|
|
" // Fresnel transmittance term\n"
|
|
" vec3 aCoatT = UNIT - aCoatF;\n"
|
|
"\n"
|
|
" float aPc = dot (theBSDF.Kc.rgb * aCoatF, theWeight);\n"
|
|
" float aPd = dot (theBSDF.Kd.rgb * aCoatT, theWeight);\n"
|
|
" float aPs = dot (theBSDF.Ks.rgb * aCoatT, theWeight);\n"
|
|
" float aPt = dot (theBSDF.Kt.rgb * aCoatT, theWeight);\n"
|
|
"\n"
|
|
" if (theWi.z * theWo.z > 0.f)\n"
|
|
" {\n"
|
|
" vec3 aH = normalize (theWi + theWo);\n"
|
|
"\n"
|
|
" aPDF = aPd * abs (theWi.z / M_PI);\n"
|
|
"\n"
|
|
" if (theBSDF.Kc.w > FLT_EPSILON)\n"
|
|
" {\n"
|
|
" float aPower = max (2.f / (theBSDF.Kc.w * theBSDF.Kc.w) - 2.f, 0.f); // roughness --> "
|
|
"exponent\n"
|
|
"\n"
|
|
" aPDF += aPc * (aPower + 2.f) * (0.25f / M_2_PI) * pow (abs (aH.z), aPower + 1.f) / dot "
|
|
"(theWi, aH);\n"
|
|
" }\n"
|
|
"\n"
|
|
" if (theBSDF.Ks.w > FLT_EPSILON)\n"
|
|
" {\n"
|
|
" float aPower = max (2.f / (theBSDF.Ks.w * theBSDF.Ks.w) - 2.f, 0.f); // roughness --> "
|
|
"exponent\n"
|
|
"\n"
|
|
" aPDF += aPs * (aPower + 2.f) * (0.25f / M_2_PI) * pow (abs (aH.z), aPower + 1.f) / dot "
|
|
"(theWi, aH);\n"
|
|
" }\n"
|
|
" }\n"
|
|
"\n"
|
|
" return aPDF / (aPc + aPd + aPs + aPt);\n"
|
|
"}\n"
|
|
"\n"
|
|
"//! Tool macro to handle sampling of particular BxDF\n"
|
|
"#define PICK_BXDF_LAYER(p, k) aPDF = p / aTotalR; theWeight *= k / aPDF;\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : SampleBsdfLayered\n"
|
|
"// purpose : Samples specified composite material (BSDF)\n"
|
|
"//=======================================================================\n"
|
|
"float SampleBsdfLayered (in SBSDF theBSDF, in vec3 theWo, out vec3 theWi, inout vec3 theWeight, "
|
|
"inout bool theInside)\n"
|
|
"{\n"
|
|
" // NOTE: OCCT uses two-layer material model. We have base diffuse, glossy, or transmissive\n"
|
|
" // layer, covered by one glossy/specular coat. In the current model, the layers themselves\n"
|
|
" // have no thickness; they can simply reflect light or transmits it to the layer under it.\n"
|
|
" // We use actual BRDF model only for direct reflection by the coat layer. For transmission\n"
|
|
" // through this layer, we approximate it as a flat specular surface.\n"
|
|
"\n"
|
|
" float aPDF = 0.f; // PDF of sampled direction\n"
|
|
"\n"
|
|
" // We choose whether the light is reflected or transmitted\n"
|
|
" // by the coating layer according to the Fresnel equations\n"
|
|
" vec3 aCoatF = fresnelMedia (theWo.z, theBSDF.FresnelCoat);\n"
|
|
"\n"
|
|
" // Coat BRDF is scaled by its Fresnel term. According to\n"
|
|
" // Wilkie-Weidlich layered BSDF model, transmission term\n"
|
|
" // for light passing through the coat at direction I and\n"
|
|
" // leaving it in O is T = ( 1 - F (O) ) x ( 1 - F (I) ).\n"
|
|
" // For reasons of simplicity, we discard the second term\n"
|
|
" // and scale base BxDFs only by the first term.\n"
|
|
" vec3 aCoatT = UNIT - aCoatF;\n"
|
|
"\n"
|
|
" float aPc = dot (theBSDF.Kc.rgb * aCoatF, theWeight);\n"
|
|
" float aPd = dot (theBSDF.Kd.rgb * aCoatT, theWeight);\n"
|
|
" float aPs = dot (theBSDF.Ks.rgb * aCoatT, theWeight);\n"
|
|
" float aPt = dot (theBSDF.Kt.rgb * aCoatT, theWeight);\n"
|
|
"\n"
|
|
" // Calculate total reflection probability\n"
|
|
" float aTotalR = (aPc + aPd) + (aPs + aPt);\n"
|
|
"\n"
|
|
" // Generate random variable to select BxDF\n"
|
|
" float aKsi = aTotalR * RandFloat();\n"
|
|
"\n"
|
|
" if (aKsi < aPc) // REFLECTION FROM COAT\n"
|
|
" {\n"
|
|
" PICK_BXDF_LAYER (aPc, theBSDF.Kc.rgb)\n"
|
|
"\n"
|
|
" if (theBSDF.Kc.w < FLT_EPSILON)\n"
|
|
" {\n"
|
|
" theWeight *= aCoatF;\n"
|
|
"\n"
|
|
" theWi = vec3 (-theWo.x,\n"
|
|
" -theWo.y,\n"
|
|
" theWo.z);\n"
|
|
" }\n"
|
|
" else\n"
|
|
" {\n"
|
|
" theWeight *= SampleGlossyBlinnReflection (theWo, theWi, theBSDF.FresnelCoat, "
|
|
"theBSDF.Kc.w, aPDF);\n"
|
|
" }\n"
|
|
"\n"
|
|
" aPDF = mix (aPDF, MAXFLOAT, theBSDF.Kc.w < FLT_EPSILON);\n"
|
|
" }\n"
|
|
" else if (aKsi < aTotalR) // REFLECTION FROM BASE\n"
|
|
" {\n"
|
|
" theWeight *= aCoatT;\n"
|
|
"\n"
|
|
" if (aKsi < aPc + aPd) // diffuse BRDF\n"
|
|
" {\n"
|
|
" PICK_BXDF_LAYER (aPd, theBSDF.Kd.rgb)\n"
|
|
"\n"
|
|
" theWeight *= SampleLambertianReflection (theWo, theWi, aPDF);\n"
|
|
" }\n"
|
|
" else if (aKsi < (aPc + aPd) + aPs) // specular/glossy BRDF\n"
|
|
" {\n"
|
|
" PICK_BXDF_LAYER (aPs, theBSDF.Ks.rgb)\n"
|
|
"\n"
|
|
" if (theBSDF.Ks.w < FLT_EPSILON)\n"
|
|
" {\n"
|
|
" theWeight *= fresnelMedia (theWo.z, theBSDF.FresnelBase.rgb);\n"
|
|
"\n"
|
|
" theWi = vec3 (-theWo.x,\n"
|
|
" -theWo.y,\n"
|
|
" theWo.z);\n"
|
|
" }\n"
|
|
" else\n"
|
|
" {\n"
|
|
" theWeight *= SampleGlossyBlinnReflection (theWo, theWi, theBSDF.FresnelBase.rgb, "
|
|
"theBSDF.Ks.w, aPDF);\n"
|
|
" }\n"
|
|
"\n"
|
|
" aPDF = mix (aPDF, MAXFLOAT, theBSDF.Ks.w < FLT_EPSILON);\n"
|
|
" }\n"
|
|
" else // specular transmission\n"
|
|
" {\n"
|
|
" PICK_BXDF_LAYER (aPt, theBSDF.Kt.rgb)\n"
|
|
"\n"
|
|
" // refracted direction should exist if we are here\n"
|
|
" transmitted (theBSDF.FresnelCoat.y, theWo, theWi);\n"
|
|
"\n"
|
|
" theInside = !theInside; aPDF = MAXFLOAT;\n"
|
|
" }\n"
|
|
" }\n"
|
|
"\n"
|
|
" // path termination for extra small weights\n"
|
|
" theWeight = mix (ZERO, theWeight, step (FLT_EPSILON, aTotalR));\n"
|
|
"\n"
|
|
" return aPDF;\n"
|
|
"}\n"
|
|
"\n"
|
|
"//////////////////////////////////////////////////////////////////////////////////////////////\n"
|
|
"// Handlers and samplers for light sources\n"
|
|
"//////////////////////////////////////////////////////////////////////////////////////////////\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : SampleLight\n"
|
|
"// purpose : General sampling function for directional and point lights\n"
|
|
"//=======================================================================\n"
|
|
"vec3 SampleLight (in vec3 theToLight, inout float theDistance, in bool isInfinite, in float "
|
|
"theSmoothness, inout float thePDF)\n"
|
|
"{\n"
|
|
" SLocalSpace aSpace = buildLocalSpace (theToLight * (1.f / theDistance));\n"
|
|
"\n"
|
|
" // for point lights smoothness defines radius\n"
|
|
" float aCosMax = isInfinite ? theSmoothness :\n"
|
|
" inversesqrt (1.f + theSmoothness * theSmoothness / (theDistance * theDistance));\n"
|
|
"\n"
|
|
" float aKsi1 = RandFloat();\n"
|
|
" float aKsi2 = RandFloat();\n"
|
|
"\n"
|
|
" float aTmp = 1.f - aKsi2 * (1.f - aCosMax);\n"
|
|
"\n"
|
|
" vec3 anInput = vec3 (cos (M_2_PI * aKsi1),\n"
|
|
" sin (M_2_PI * aKsi1),\n"
|
|
" aTmp);\n"
|
|
"\n"
|
|
" anInput.xy *= sqrt (1.f - aTmp * aTmp);\n"
|
|
"\n"
|
|
" thePDF = (aCosMax < 1.f) ? (thePDF / M_2_PI) / (1.f - aCosMax) : MAXFLOAT;\n"
|
|
"\n"
|
|
" return normalize (fromLocalSpace (anInput, aSpace));\n"
|
|
"}\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : HandlePointLight\n"
|
|
"// purpose :\n"
|
|
"//=======================================================================\n"
|
|
"float HandlePointLight (in vec3 theInput, in vec3 theToLight, in float theRadius, in float "
|
|
"theDistance, inout float thePDF)\n"
|
|
"{\n"
|
|
" float aCosMax = inversesqrt (1.f + theRadius * theRadius / (theDistance * theDistance));\n"
|
|
"\n"
|
|
" float aVisibility = step (aCosMax, dot (theInput, theToLight));\n"
|
|
"\n"
|
|
" thePDF *= step (-1.f, -aCosMax) * aVisibility * (1.f / M_2_PI) / (1.f - aCosMax);\n"
|
|
"\n"
|
|
" return aVisibility;\n"
|
|
"}\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : HandleDistantLight\n"
|
|
"// purpose :\n"
|
|
"//=======================================================================\n"
|
|
"float HandleDistantLight (in vec3 theInput, in vec3 theToLight, in float theCosMax, inout float "
|
|
"thePDF)\n"
|
|
"{\n"
|
|
" float aVisibility = step (theCosMax, dot (theInput, theToLight));\n"
|
|
"\n"
|
|
" thePDF *= step (-1.f, -theCosMax) * aVisibility * (1.f / M_2_PI) / (1.f - theCosMax);\n"
|
|
"\n"
|
|
" return aVisibility;\n"
|
|
"}\n"
|
|
"\n"
|
|
"// =======================================================================\n"
|
|
"// function: IntersectLight\n"
|
|
"// purpose : Checks intersections with light sources\n"
|
|
"// =======================================================================\n"
|
|
"vec3 IntersectLight (in SRay theRay, in int theDepth, in float theHitDistance, out float "
|
|
"thePDF)\n"
|
|
"{\n"
|
|
" vec3 aTotalRadiance = ZERO;\n"
|
|
" thePDF = 0.f; // PDF of sampling light sources\n"
|
|
" for (int aLightIdx = 0; aLightIdx < uLightCount; ++aLightIdx)\n"
|
|
" {\n"
|
|
" vec4 aLight = texelFetch (uRaytraceLightSrcTexture, LIGHT_POS (aLightIdx));\n"
|
|
" vec4 aParam = texelFetch (uRaytraceLightSrcTexture, LIGHT_PWR (aLightIdx));\n"
|
|
"\n"
|
|
" // W component: 0 for infinite light and 1 for point light\n"
|
|
" aLight.xyz -= mix (ZERO, theRay.Origin, aLight.w);\n"
|
|
" float aPDF = 1.0 / float(uLightCount);\n"
|
|
" if (aLight.w != 0.f) // point light source\n"
|
|
" {\n"
|
|
" float aCenterDst = length (aLight.xyz);\n"
|
|
" if (aCenterDst < theHitDistance)\n"
|
|
" {\n"
|
|
" float aVisibility = HandlePointLight (\n"
|
|
" theRay.Direct, normalize (aLight.xyz), aParam.w /* radius */, aCenterDst, aPDF);\n"
|
|
"\n"
|
|
" if (aVisibility > 0.f)\n"
|
|
" {\n"
|
|
" theHitDistance = aCenterDst;\n"
|
|
" aTotalRadiance = aParam.rgb;\n"
|
|
"\n"
|
|
" thePDF = aPDF;\n"
|
|
" }\n"
|
|
" }\n"
|
|
" }\n"
|
|
" else if (theHitDistance == MAXFLOAT) // directional light source\n"
|
|
" {\n"
|
|
" aTotalRadiance += aParam.rgb * HandleDistantLight (\n"
|
|
" theRay.Direct, aLight.xyz, aParam.w /* angle cosine */, aPDF);\n"
|
|
"\n"
|
|
" thePDF += aPDF;\n"
|
|
" }\n"
|
|
" }\n"
|
|
"\n"
|
|
" if (thePDF == 0.f && theHitDistance == MAXFLOAT) // light source not found\n"
|
|
" {\n"
|
|
" if (theDepth + uEnvMapForBack == 0) // view ray and map is hidden\n"
|
|
" {\n"
|
|
" aTotalRadiance = BackgroundColor().rgb;\n"
|
|
" }\n"
|
|
" else\n"
|
|
" {\n"
|
|
" #ifdef BACKGROUND_CUBEMAP\n"
|
|
" if (theDepth == 0)\n"
|
|
" {\n"
|
|
" vec2 aPixel = uEyeSize * (vPixel - vec2 (0.5)) * 2.0;\n"
|
|
" vec2 anAperturePnt = sampleUniformDisk() * uApertureRadius;\n"
|
|
" vec3 aLocalDir = normalize (vec3 (aPixel * uFocalPlaneDist - anAperturePnt, "
|
|
"uFocalPlaneDist));\n"
|
|
" vec3 aDirect = uEyeView * aLocalDir.z +\n"
|
|
" uEyeSide * aLocalDir.x +\n"
|
|
" uEyeVert * aLocalDir.y;\n"
|
|
" aTotalRadiance = FetchEnvironment (aDirect, 1.0, true).rgb;\n"
|
|
" }\n"
|
|
" else\n"
|
|
" {\n"
|
|
" aTotalRadiance = FetchEnvironment (theRay.Direct, 1.0, false).rgb;\n"
|
|
" }\n"
|
|
" #else\n"
|
|
" aTotalRadiance = FetchEnvironment (theRay.Direct, 1.0, theDepth == 0).rgb;\n"
|
|
" #endif\n"
|
|
" }\n"
|
|
" #ifdef THE_SHIFT_sRGB\n"
|
|
" aTotalRadiance = pow (aTotalRadiance, vec3 (2.f));\n"
|
|
" #endif\n"
|
|
" }\n"
|
|
" \n"
|
|
" return aTotalRadiance;\n"
|
|
"}\n"
|
|
"\n"
|
|
"#define MIN_THROUGHPUT vec3 (1.0e-3f)\n"
|
|
"#define MIN_CONTRIBUTION vec3 (1.0e-2f)\n"
|
|
"\n"
|
|
"#define MATERIAL_KC(index) (19 * index + 11)\n"
|
|
"#define MATERIAL_KD(index) (19 * index + 12)\n"
|
|
"#define MATERIAL_KS(index) (19 * index + 13)\n"
|
|
"#define MATERIAL_KT(index) (19 * index + 14)\n"
|
|
"#define MATERIAL_LE(index) (19 * index + 15)\n"
|
|
"#define MATERIAL_FRESNEL_COAT(index) (19 * index + 16)\n"
|
|
"#define MATERIAL_FRESNEL_BASE(index) (19 * index + 17)\n"
|
|
"#define MATERIAL_ABSORPT_BASE(index) (19 * index + 18)\n"
|
|
"\n"
|
|
"//! Enables experimental Russian roulette sampling path termination.\n"
|
|
"//! In most cases, it provides faster image convergence with minimal\n"
|
|
"//! bias, so it is enabled by default.\n"
|
|
"#define RUSSIAN_ROULETTE\n"
|
|
"\n"
|
|
"//! Frame step to increase number of bounces. This mode is used\n"
|
|
"//! for interaction with the model, when path length is limited\n"
|
|
"//! for the first samples, and gradually increasing when camera\n"
|
|
"//! is stabilizing.\n"
|
|
"#ifdef ADAPTIVE_SAMPLING\n"
|
|
" #define FRAME_STEP 4\n"
|
|
"#else\n"
|
|
" #define FRAME_STEP 5\n"
|
|
"#endif\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : IsNotZero\n"
|
|
"// purpose : Checks whether BSDF reflects direct light\n"
|
|
"//=======================================================================\n"
|
|
"bool IsNotZero (in SBSDF theBSDF, in vec3 theThroughput)\n"
|
|
"{\n"
|
|
" vec3 aGlossy = theBSDF.Kc.rgb * step (FLT_EPSILON, theBSDF.Kc.w) +\n"
|
|
" theBSDF.Ks.rgb * step (FLT_EPSILON, theBSDF.Ks.w);\n"
|
|
"\n"
|
|
" return convolve (theBSDF.Kd.rgb + aGlossy, theThroughput) > FLT_EPSILON;\n"
|
|
"}\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : NormalAdaptation\n"
|
|
"// purpose : Adapt smooth normal (which may be different from geometry normal) in order to "
|
|
"avoid black areas in render\n"
|
|
"//=======================================================================\n"
|
|
"bool NormalAdaptation (in vec3 theView, in vec3 theGeometryNormal, inout vec3 theSmoothNormal)\n"
|
|
"{\n"
|
|
" float aMinCos = dot(theView, theGeometryNormal);\n"
|
|
" aMinCos = 0.5 * (sqrt(1.0 - aMinCos) + sqrt(1.0 + aMinCos));\n"
|
|
" float aCos = dot(theGeometryNormal, theSmoothNormal);\n"
|
|
" if (aCos < aMinCos)\n"
|
|
" {\n"
|
|
" theSmoothNormal = aMinCos * theGeometryNormal + normalize(theSmoothNormal - aCos * "
|
|
"theGeometryNormal) * sqrt(1.0 - aMinCos * aMinCos);\n"
|
|
" return true;\n"
|
|
" }\n"
|
|
" return false;\n"
|
|
"}\n"
|
|
"\n"
|
|
"//=======================================================================\n"
|
|
"// function : PathTrace\n"
|
|
"// purpose : Calculates radiance along the given ray\n"
|
|
"//=======================================================================\n"
|
|
"vec4 PathTrace (in SRay theRay, in vec3 theInverse, in int theNbSamples)\n"
|
|
"{\n"
|
|
" float aRaytraceDepth = MAXFLOAT;\n"
|
|
"\n"
|
|
" vec3 aRadiance = ZERO;\n"
|
|
" vec3 aThroughput = UNIT;\n"
|
|
"\n"
|
|
" int aTransfID = 0; // ID of object transformation\n"
|
|
" bool aInMedium = false; // is the ray inside an object\n"
|
|
"\n"
|
|
" float aExpPDF = 1.f;\n"
|
|
" float aImpPDF = 1.f;\n"
|
|
"\n"
|
|
" for (int aDepth = 0; aDepth < NB_BOUNCES; ++aDepth)\n"
|
|
" {\n"
|
|
" SIntersect aHit = SIntersect (MAXFLOAT, vec2 (ZERO), ZERO);\n"
|
|
"\n"
|
|
" STriangle aTriangle = SceneNearestHit (theRay, theInverse, aHit, aTransfID);\n"
|
|
"\n"
|
|
" // check implicit path\n"
|
|
" vec3 aLe = IntersectLight (theRay, aDepth, aHit.Time, aExpPDF);\n"
|
|
"\n"
|
|
" if (any (greaterThan (aLe, ZERO)) || aTriangle.TriIndex.x == -1)\n"
|
|
" {\n"
|
|
" float aMIS = (aDepth == 0 || aImpPDF == MAXFLOAT) ? 1.f :\n"
|
|
" aImpPDF * aImpPDF / (aExpPDF * aExpPDF + aImpPDF * aImpPDF);\n"
|
|
"\n"
|
|
" aRadiance += aThroughput * aLe * aMIS; break; // terminate path\n"
|
|
" }\n"
|
|
"\n"
|
|
" vec3 aInvTransf0 = texelFetch (uSceneTransformTexture, aTransfID + 0).xyz;\n"
|
|
" vec3 aInvTransf1 = texelFetch (uSceneTransformTexture, aTransfID + 1).xyz;\n"
|
|
" vec3 aInvTransf2 = texelFetch (uSceneTransformTexture, aTransfID + 2).xyz;\n"
|
|
"\n"
|
|
" // compute geometrical normal\n"
|
|
" aHit.Normal = normalize (vec3 (dot (aInvTransf0, aHit.Normal),\n"
|
|
" dot (aInvTransf1, aHit.Normal),\n"
|
|
" dot (aInvTransf2, aHit.Normal)));\n"
|
|
"\n"
|
|
" theRay.Origin += theRay.Direct * aHit.Time; // get new intersection point\n"
|
|
"\n"
|
|
" // evaluate depth on first hit\n"
|
|
" if (aDepth == 0)\n"
|
|
" {\n"
|
|
" vec4 aNDCPoint = uViewMat * vec4 (theRay.Origin, 1.f);\n"
|
|
"\n"
|
|
" float aPolygonOffset = PolygonOffset (aHit.Normal, theRay.Origin);\n"
|
|
" #ifdef THE_ZERO_TO_ONE_DEPTH\n"
|
|
" aRaytraceDepth = (aNDCPoint.z / aNDCPoint.w + aPolygonOffset * POLYGON_OFFSET_SCALE);\n"
|
|
" #else\n"
|
|
" aRaytraceDepth = (aNDCPoint.z / aNDCPoint.w + aPolygonOffset * POLYGON_OFFSET_SCALE) * "
|
|
"0.5f + 0.5f;\n"
|
|
" #endif\n"
|
|
" }\n"
|
|
"\n"
|
|
" SBSDF aBSDF;\n"
|
|
"\n"
|
|
" // fetch BxDF weights\n"
|
|
" aBSDF.Kc = texelFetch (uRaytraceMaterialTexture, MATERIAL_KC (aTriangle.TriIndex.w));\n"
|
|
" aBSDF.Kd = texelFetch (uRaytraceMaterialTexture, MATERIAL_KD (aTriangle.TriIndex.w));\n"
|
|
" aBSDF.Ks = texelFetch (uRaytraceMaterialTexture, MATERIAL_KS (aTriangle.TriIndex.w));\n"
|
|
" aBSDF.Kt = texelFetch (uRaytraceMaterialTexture, MATERIAL_KT (aTriangle.TriIndex.w));\n"
|
|
"\n"
|
|
" // fetch Fresnel reflectance for both layers\n"
|
|
" aBSDF.FresnelCoat = texelFetch (uRaytraceMaterialTexture, MATERIAL_FRESNEL_COAT "
|
|
"(aTriangle.TriIndex.w)).xyz;\n"
|
|
" aBSDF.FresnelBase = texelFetch (uRaytraceMaterialTexture, MATERIAL_FRESNEL_BASE "
|
|
"(aTriangle.TriIndex.w));\n"
|
|
"\n"
|
|
" vec4 anLE = texelFetch (uRaytraceMaterialTexture, MATERIAL_LE (aTriangle.TriIndex.w));\n"
|
|
"\n"
|
|
" // compute smooth normal (in parallel with fetch)\n"
|
|
" vec3 aNormal = SmoothNormal (aHit.UV, aTriangle.TriIndex);\n"
|
|
" aNormal = normalize (vec3 (dot (aInvTransf0, aNormal),\n"
|
|
" dot (aInvTransf1, aNormal),\n"
|
|
" dot (aInvTransf2, aNormal)));\n"
|
|
"\n"
|
|
"#ifdef USE_TEXTURES\n"
|
|
" if (aBSDF.Kd.w >= 0.0 || aBSDF.Kt.w >= 0.0 || aBSDF.FresnelBase.w >=0.0 || anLE.w >= 0.0)\n"
|
|
" {\n"
|
|
" vec2 aUVs[3];\n"
|
|
" vec4 aTexCoord = vec4 (SmoothUV (aHit.UV, aTriangle.TriIndex, aUVs), 0.f, 1.f);\n"
|
|
" vec4 aTrsfRow1 = texelFetch (uRaytraceMaterialTexture, MATERIAL_TRS1 "
|
|
"(aTriangle.TriIndex.w));\n"
|
|
" vec4 aTrsfRow2 = texelFetch (uRaytraceMaterialTexture, MATERIAL_TRS2 "
|
|
"(aTriangle.TriIndex.w));\n"
|
|
" aTexCoord.st = vec2 (dot (aTrsfRow1, aTexCoord),\n"
|
|
" dot (aTrsfRow2, aTexCoord));\n"
|
|
"\n"
|
|
" if (anLE.w >= 0.0)\n"
|
|
" {\n"
|
|
" anLE.rgb *= textureLod (sampler2D (uTextureSamplers[int (anLE.w)]), aTexCoord.st, "
|
|
"0.0).rgb;\n"
|
|
" }\n"
|
|
" if (aBSDF.Kt.w >= 0.0)\n"
|
|
" {\n"
|
|
" vec2 aTexMetRough = textureLod (sampler2D (uTextureSamplers[int (aBSDF.Kt.w)]), "
|
|
"aTexCoord.st, 0.0).bg;\n"
|
|
" float aPbrMetal = aTexMetRough.x;\n"
|
|
" float aPbrRough2 = aTexMetRough.y * aTexMetRough.y;\n"
|
|
" aBSDF.Ks.a *= aPbrRough2;\n"
|
|
" // when using metal-roughness texture, global metalness of material (encoded in "
|
|
"FresnelBase) is expected to be 1.0 so that Kd will be 0.0\n"
|
|
" aBSDF.Kd.rgb = aBSDF.FresnelBase.rgb * (1.0 - aPbrMetal);\n"
|
|
" aBSDF.FresnelBase.rgb *= aPbrMetal;\n"
|
|
" }\n"
|
|
" if (aBSDF.Kd.w >= 0.0)\n"
|
|
" {\n"
|
|
" vec4 aTexColor = textureLod (sampler2D (uTextureSamplers[int (aBSDF.Kd.w)]), "
|
|
"aTexCoord.st, 0.0);\n"
|
|
" vec3 aDiff = aTexColor.rgb * aTexColor.a;\n"
|
|
" aBSDF.Kd.rgb *= aDiff;\n"
|
|
" aBSDF.FresnelBase.rgb *= aDiff;\n"
|
|
" if (aTexColor.a != 1.0)\n"
|
|
" {\n"
|
|
" // mix transparency BTDF with texture alpha-channel\n"
|
|
" aBSDF.Ks.rgb *= aTexColor.a;\n"
|
|
" aBSDF.Kt.rgb = (UNIT - aTexColor.aaa) + aTexColor.a * aBSDF.Kt.rgb;\n"
|
|
" }\n"
|
|
" }\n"
|
|
" #ifndef IGNORE_NORMAL_MAP\n"
|
|
" if (aBSDF.FresnelBase.w >= 0.0)\n"
|
|
" {\n"
|
|
" for (int i = 0 ; i < 3; ++i)\n"
|
|
" {\n"
|
|
" aUVs[i] = vec2 (dot (aTrsfRow1, vec4(aUVs[i], 0.0, 1.0)),\n"
|
|
" dot (aTrsfRow2, vec4(aUVs[i], 0.0, 1.0)));\n"
|
|
" }\n"
|
|
" vec3 aMapNormalValue = textureLod (sampler2D (uTextureSamplers[int "
|
|
"(aBSDF.FresnelBase.w)]), aTexCoord.st, 0.0).xyz;\n"
|
|
" mat2 aDeltaUVMatrix = mat2 (aUVs[1] - aUVs[0], aUVs[1] - aUVs[2]);\n"
|
|
" mat2x3 aDeltaVectorMatrix = mat2x3 (aTriangle.Points[1] - aTriangle.Points[0], "
|
|
"aTriangle.Points[1] - aTriangle.Points[2]);\n"
|
|
" aNormal = TangentSpaceNormal (aDeltaUVMatrix, aDeltaVectorMatrix, aMapNormalValue, "
|
|
"aNormal, true);\n"
|
|
" }\n"
|
|
" #endif\n"
|
|
" }\n"
|
|
"#endif\n"
|
|
" NormalAdaptation (-theRay.Direct, aHit.Normal, aNormal);\n"
|
|
" aHit.Normal = aNormal;\n"
|
|
" SLocalSpace aSpace = buildLocalSpace (aNormal);\n"
|
|
"\n"
|
|
" if (uLightCount > 0 && IsNotZero (aBSDF, aThroughput))\n"
|
|
" {\n"
|
|
" aExpPDF = 1.0 / float(uLightCount);\n"
|
|
"\n"
|
|
" int aLightIdx = min (int (floor (RandFloat() * float(uLightCount))), uLightCount - 1);\n"
|
|
"\n"
|
|
" vec4 aLight = texelFetch (uRaytraceLightSrcTexture, LIGHT_POS (aLightIdx));\n"
|
|
" vec4 aParam = texelFetch (uRaytraceLightSrcTexture, LIGHT_PWR (aLightIdx));\n"
|
|
"\n"
|
|
" // 'w' component is 0 for infinite light and 1 for point light\n"
|
|
" aLight.xyz -= mix (ZERO, theRay.Origin, aLight.w);\n"
|
|
"\n"
|
|
" float aDistance = length (aLight.xyz);\n"
|
|
"\n"
|
|
" aLight.xyz = SampleLight (aLight.xyz, aDistance,\n"
|
|
" aLight.w == 0.f /* is infinite */, aParam.w /* max cos or radius */, aExpPDF);\n"
|
|
"\n"
|
|
" aImpPDF = BsdfPdfLayered (aBSDF,\n"
|
|
" toLocalSpace (-theRay.Direct, aSpace), toLocalSpace (aLight.xyz, aSpace), "
|
|
"aThroughput);\n"
|
|
"\n"
|
|
" // MIS weight including division by explicit PDF\n"
|
|
" float aMIS = (aExpPDF == MAXFLOAT) ? 1.f : aExpPDF / (aExpPDF * aExpPDF + aImpPDF * "
|
|
"aImpPDF);\n"
|
|
"\n"
|
|
" vec3 aContrib = aMIS * aParam.rgb /* Le */ * EvalBsdfLayered (\n"
|
|
" aBSDF, toLocalSpace (aLight.xyz, aSpace), toLocalSpace (-theRay.Direct, aSpace));\n"
|
|
"\n"
|
|
" if (any (greaterThan (aContrib, MIN_CONTRIBUTION))) // check if light source is "
|
|
"important\n"
|
|
" {\n"
|
|
" SRay aShadow = SRay (theRay.Origin + aLight.xyz * uSceneEpsilon, aLight.xyz);\n"
|
|
"\n"
|
|
" aShadow.Origin += aHit.Normal * mix (\n"
|
|
" -uSceneEpsilon, uSceneEpsilon, step (0.f, dot (aHit.Normal, aLight.xyz)));\n"
|
|
"\n"
|
|
" float aVisibility = SceneAnyHit (aShadow,\n"
|
|
" InverseDirection (aLight.xyz), aLight.w == 0.f ? MAXFLOAT : aDistance);\n"
|
|
"\n"
|
|
" aRadiance += aVisibility * (aThroughput * aContrib);\n"
|
|
" }\n"
|
|
" }\n"
|
|
"\n"
|
|
" // account for self-emission\n"
|
|
" aRadiance += aThroughput * anLE.rgb;\n"
|
|
"\n"
|
|
" if (aInMedium) // handle attenuation\n"
|
|
" {\n"
|
|
" vec4 aScattering = texelFetch (uRaytraceMaterialTexture, MATERIAL_ABSORPT_BASE "
|
|
"(aTriangle.TriIndex.w));\n"
|
|
"\n"
|
|
" aThroughput *= exp (-aHit.Time * aScattering.w * (UNIT - aScattering.rgb));\n"
|
|
" }\n"
|
|
"\n"
|
|
" vec3 anInput = UNIT; // sampled input direction\n"
|
|
"\n"
|
|
" aImpPDF = SampleBsdfLayered (aBSDF,\n"
|
|
" toLocalSpace (-theRay.Direct, aSpace), anInput, aThroughput, aInMedium);\n"
|
|
"\n"
|
|
" float aSurvive = float (any (greaterThan (aThroughput, MIN_THROUGHPUT)));\n"
|
|
"\n"
|
|
"#ifdef RUSSIAN_ROULETTE\n"
|
|
" aSurvive = aDepth < 3 ? aSurvive : min (dot (LUMA, aThroughput), 0.95f);\n"
|
|
"#endif\n"
|
|
"\n"
|
|
" // here, we additionally increase path length for non-diffuse bounces\n"
|
|
" if (RandFloat() > aSurvive\n"
|
|
" || all (lessThan (aThroughput, MIN_THROUGHPUT))\n"
|
|
" || aDepth >= (theNbSamples / FRAME_STEP + int(step (1.0 / M_PI, aImpPDF))))\n"
|
|
" {\n"
|
|
" aDepth = INVALID_BOUNCES; // terminate path\n"
|
|
" }\n"
|
|
"\n"
|
|
"#ifdef RUSSIAN_ROULETTE\n"
|
|
" aThroughput /= aSurvive;\n"
|
|
"#endif\n"
|
|
"\n"
|
|
" anInput = normalize (fromLocalSpace (anInput, aSpace));\n"
|
|
"\n"
|
|
" theRay = SRay (theRay.Origin + anInput * uSceneEpsilon +\n"
|
|
" aHit.Normal * mix (-uSceneEpsilon, uSceneEpsilon, step (0.f, dot (aHit.Normal, "
|
|
"anInput))), anInput);\n"
|
|
"\n"
|
|
" theInverse = InverseDirection (anInput);\n"
|
|
" }\n"
|
|
"\n"
|
|
" gl_FragDepth = aRaytraceDepth;\n"
|
|
"\n"
|
|
" return vec4 (aRadiance, aRaytraceDepth);\n"
|
|
"}\n"
|
|
"\n"
|
|
"#endif\n";
|