+ return "\n void bounce(inout Path path, int i, inout SurfaceInteraction si) {\n if (!si.hit) {\n if (path.specularBounce) {\n path.li += path.beta * sampleBackgroundFromDirection(path.ray.d);\n }\n\n path.abort = true;\n } else {\n #ifdef USE_GLASS\n if (si.materialType == THIN_GLASS || si.materialType == THICK_GLASS) {\n sampleGlassSpecular(si, i, path);\n }\n #endif\n #ifdef USE_SHADOW_CATCHER\n if (si.materialType == SHADOW_CATCHER) {\n sampleShadowCatcher(si, i, path);\n }\n #endif\n if (si.materialType == STANDARD) {\n sampleMaterial(si, i, path);\n }\n\n // Russian Roulette sampling\n if (i >= 2) {\n float q = 1.0 - dot(path.beta, luminance);\n if (randomSample() < q) {\n path.abort = true;\n }\n path.beta /= 1.0 - q;\n }\n }\n }\n\n // Path tracing integrator as described in\n // http://www.pbr-book.org/3ed-2018/Light_Transport_I_Surface_Reflection/Path_Tracing.html#\n vec4 integrator(inout Ray ray) {\n Path path;\n path.ray = ray;\n path.li = vec3(0);\n path.alpha = 1.0;\n path.beta = vec3(1.0);\n path.specularBounce = true;\n path.abort = false;\n\n SurfaceInteraction si;\n\n // first surface interaction from g-buffer\n surfaceInteractionDirect(vCoord, si);\n\n // first surface interaction from ray interesction\n // intersectScene(path.ray, si);\n\n bounce(path, 1, si);\n\n // Manually unroll for loop.\n // Some hardware fails to iterate over a GLSL loop, so we provide this workaround\n // for (int i = 1; i < defines.bounces + 1, i += 1)\n // equivelant to\n ".concat(unrollLoop('i', 2, defines.BOUNCES + 1, 1, "\n if (path.abort) {\n return vec4(path.li, path.alpha);\n }\n intersectScene(path.ray, si);\n bounce(path, i, si);\n "), "\n\n return vec4(path.li, path.alpha);\n }\n\n void main() {\n initRandom();\n\n vec2 vCoordAntiAlias = vCoord + jitter;\n\n vec3 direction = normalize(vec3(vCoordAntiAlias - 0.5, -1.0) * vec3(camera.aspect, 1.0, camera.fov));\n\n // Thin lens model with depth-of-field\n // http://www.pbr-book.org/3ed-2018/Camera_Models/Projective_Camera_Models.html#TheThinLensModelandDepthofField\n // vec2 lensPoint = camera.aperture * sampleCircle(randomSampleVec2());\n // vec3 focusPoint = -direction * camera.focus / direction.z; // intersect ray direction with focus plane\n\n // vec3 origin = vec3(lensPoint, 0.0);\n // direction = normalize(focusPoint - origin);\n\n // origin = vec3(camera.transform * vec4(origin, 1.0));\n // direction = mat3(camera.transform) * direction;\n\n vec3 origin = camera.transform[3].xyz;\n direction = mat3(camera.transform) * direction;\n\n Ray cam;\n initRay(cam, origin, direction);\n\n vec4 liAndAlpha = integrator(cam);\n\n if (!(liAndAlpha.x < INF && liAndAlpha.x > -EPS)) {\n liAndAlpha = vec4(0, 0, 0, 1);\n }\n\n out_light = liAndAlpha;\n\n // Stratified Sampling Sample Count Test\n // ---------------\n // Uncomment the following code\n // Then observe the colors of the image\n // If:\n // * The resulting image is pure black\n // Extra samples are being passed to the shader that aren't being used.\n // * The resulting image contains red\n // Not enough samples are being passed to the shader\n // * The resulting image contains only white with some black\n // All samples are used by the shader. Correct result!\n\n // fragColor = vec4(0, 0, 0, 1);\n // if (sampleIndex == SAMPLING_DIMENSIONS) {\n // fragColor = vec4(1, 1, 1, 1);\n // } else if (sampleIndex > SAMPLING_DIMENSIONS) {\n // fragColor = vec4(1, 0, 0, 1);\n // }\n}\n");
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