1 line
10 KiB
JavaScript
1 line
10 KiB
JavaScript
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export default "@export ecgl.ssr.main\n\n#define SHADER_NAME SSR\n#define MAX_ITERATION 20;\n#define SAMPLE_PER_FRAME 5;\n#define TOTAL_SAMPLES 128;\n\nuniform sampler2D sourceTexture;\nuniform sampler2D gBufferTexture1;\nuniform sampler2D gBufferTexture2;\nuniform sampler2D gBufferTexture3;\nuniform samplerCube specularCubemap;\nuniform float specularIntensity: 1;\n\nuniform mat4 projection;\nuniform mat4 projectionInv;\nuniform mat4 toViewSpace;\nuniform mat4 toWorldSpace;\n\nuniform float maxRayDistance: 200;\n\nuniform float pixelStride: 16;\nuniform float pixelStrideZCutoff: 50; \nuniform float screenEdgeFadeStart: 0.9; \nuniform float eyeFadeStart : 0.2; uniform float eyeFadeEnd: 0.8; \nuniform float minGlossiness: 0.2; uniform float zThicknessThreshold: 1;\n\nuniform float nearZ;\nuniform vec2 viewportSize : VIEWPORT_SIZE;\n\nuniform float jitterOffset: 0;\n\nvarying vec2 v_Texcoord;\n\n#ifdef DEPTH_DECODE\n@import clay.util.decode_float\n#endif\n\n#ifdef PHYSICALLY_CORRECT\nuniform sampler2D normalDistribution;\nuniform float sampleOffset: 0;\nuniform vec2 normalDistributionSize;\n\nvec3 transformNormal(vec3 H, vec3 N) {\n vec3 upVector = N.y > 0.999 ? vec3(1.0, 0.0, 0.0) : vec3(0.0, 1.0, 0.0);\n vec3 tangentX = normalize(cross(N, upVector));\n vec3 tangentZ = cross(N, tangentX);\n return normalize(tangentX * H.x + N * H.y + tangentZ * H.z);\n}\nvec3 importanceSampleNormalGGX(float i, float roughness, vec3 N) {\n float p = fract((i + sampleOffset) / float(TOTAL_SAMPLES));\n vec3 H = texture2D(normalDistribution,vec2(roughness, p)).rgb;\n return transformNormal(H, N);\n}\nfloat G_Smith(float g, float ndv, float ndl) {\n float roughness = 1.0 - g;\n float k = roughness * roughness / 2.0;\n float G1V = ndv / (ndv * (1.0 - k) + k);\n float G1L = ndl / (ndl * (1.0 - k) + k);\n return G1L * G1V;\n}\nvec3 F_Schlick(float ndv, vec3 spec) {\n return spec + (1.0 - spec) * pow(1.0 - ndv, 5.0);\n}\n#endif\n\nfloat fetchDepth(sampler2D depthTexture, vec2 uv)\n{\n vec4 depthTexel = texture2D(depthTexture, uv);\n return depthTexel.r * 2.0 - 1.0;\n}\n\nfloat linearDepth(float depth)\n{\n if (projection[3][3] == 0.0) {\n return projection[3][2] / (depth * projection[2][3] - projection[2][2]);\n }\n else {\n return (depth - projection[3][2]) / projection[2][2];\n }\n}\n\nbool rayIntersectDepth(float rayZNear, float rayZFar, vec2 hitPixel)\n{\n if (rayZFar > rayZNear)\n {\n float t = rayZFar; rayZFar = rayZNear; rayZNear = t;\n }\n float cameraZ = linearDepth(fetchDepth(gBufferTexture2, hitPixel));\n return rayZFar <= cameraZ && rayZNear >= cameraZ - zThicknessThreshold;\n}\n\n\nbool traceScreenSpaceRay(\n vec3 rayOrigin, vec3 rayDir, float jitter,\n out vec2 hitPixel, out vec3 hitPoint, out float iterationCount\n)\n{\n float rayLength = ((rayOrigin.z + rayDir.z * maxRayDistance) > -nearZ)\n ? (-nearZ - rayOrigin.z) / rayDir.z : maxRayDistance;\n\n vec3 rayEnd = rayOrigin + rayDir * rayLength;\n\n vec4 H0 = projection * vec4(rayOrigin, 1.0);\n vec4 H1 = projection * vec4(rayEnd, 1.0);\n\n float k0 = 1.0 / H0.w, k1 = 1.0 / H1.w;\n\n vec3 Q0 = rayOrigin * k0, Q1 = rayEnd * k1;\n\n vec2 P0 = (H0.xy * k0 * 0.5 + 0.5) * viewportSize;\n vec2 P1 = (H1.xy * k1 * 0.5 + 0.5) * viewportSize;\n\n P1 += dot(P1 - P0, P1 - P0) < 0.0001 ? 0.01 : 0.0;\n vec2 delta = P1 - P0;\n\n bool permute = false;\n if (abs(delta.x) < abs(delta.y)) {\n permute = true;\n delta = delta.yx;\n P0 = P0.yx;\n P1 = P1.yx;\n }\n float stepDir = sign(delta.x);\n float invdx = stepDir / delta.x;\n\n vec3 dQ = (Q1 - Q0) * invdx;\n float dk = (k1 - k0) * invdx;\n\n vec2 dP = vec2(stepDir, delta.y * invdx);\n\n float strideScaler = 1.0 - min(1.0, -rayOrigin.z / pixelStrideZCutoff);\n float pixStride = 1.0 + strideScaler * pixelStride;\n\n dP *= pixStride; dQ *= pixStride; dk *= pixStride;\n\n vec4 pqk = vec4(P0, Q0.z, k0);\n vec4 dPQK = vec4(dP, dQ.z, dk);\n\n pqk += dPQK * jitter;\n float rayZFar = (dPQK.z * 0.5 + pqk.z) / (dPQK.w * 0.5 + pqk.w);\n float rayZNear;\n\n bool intersect = false;\n\n vec2 texelSize = 1.0 / viewportSize;\n\n iterationCount = 0.0;\n\n for (int i
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