atdunbg
f73e52926f
- App/editor: move 7 panels into panels/ (Editor core stays at root) - shaders/: group into pbr/ post/ debug/ env/ (runtime load paths updated) - Delete outdated duplicate Engine/src/Renderer/VulkanAssetUploader.h
49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
#version 450
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// IBL ②：环境 cube → 漫反射辐照度 cube（半球 Lambert 卷积）。
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// E = ∫ L·cosθ·sinθ dθ dφ，切线基 up×N 构造。64×32 = 2048 采样/像素
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// （与 CPU 版同级精度），32² 低频输出上 GPU 耗时可忽略。
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#include "ibl_common.glsl"
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layout(local_size_x = 8, local_size_y = 8) in;
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layout(set = 0, binding = 0) uniform samplerCube env;
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layout(set = 0, binding = 1, rgba16f) uniform restrict writeonly image2DArray outCube;
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const int PHI_STEPS = 64;
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const int THETA_STEPS = 32;
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void main()
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{
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ivec3 gid = ivec3(gl_GlobalInvocationID);
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ivec2 size = imageSize(outCube).xy;
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if (gid.x >= size.x || gid.y >= size.y) return;
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vec2 uv = (vec2(gid.xy) + 0.5) / vec2(size);
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vec3 N = iblFaceDir(uint(gid.z), uv.x, uv.y);
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vec3 up = abs(N.y) > 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);
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vec3 T = normalize(cross(up, N));
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vec3 B = cross(N, T);
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float dPhi = 2.0 * IBL_PI / float(PHI_STEPS);
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float dTheta = 0.5 * IBL_PI / float(THETA_STEPS);
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vec3 irradiance = vec3(0.0);
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for (int p = 0; p < PHI_STEPS; ++p) {
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float phi = (float(p) + 0.5) * dPhi;
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for (int t = 0; t < THETA_STEPS; ++t) {
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float theta = (float(t) + 0.5) * dTheta;
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float sinT = sin(theta);
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float cosT = cos(theta);
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vec3 sampleDir = T * (sinT * cos(phi)) +
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B * (sinT * sin(phi)) +
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N * cosT;
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irradiance += texture(env, sampleDir).rgb * (cosT * sinT);
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}
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}
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imageStore(outCube, gid, vec4(irradiance * (dPhi * dTheta), 1.0));
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}
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