68 lines
2.4 KiB
GLSL
68 lines
2.4 KiB
GLSL
/**
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*
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* RenderPipeline
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*
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* Copyright (c) 2014-2016 tobspr <tobias.springer1@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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#version 430
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#pragma include "render_pipeline_base.inc.glsl"
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#pragma include "includes/importance_sampling.inc.glsl"
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#pragma include "includes/poisson_disk.inc.glsl"
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#pragma include "includes/noise.inc.glsl"
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#pragma optionNV (unroll all)
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uniform samplerCube SourceCubemap;
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uniform writeonly imageCube RESTRICT DestCubemap;
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uniform int cubeSize;
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void main() {
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const int sample_count = 64;
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// Get cubemap coordinate
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ivec2 coord = ivec2(gl_FragCoord.xy);
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ivec2 clamped_coord; int face;
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vec3 n = texcoord_to_cubemap(cubeSize, coord, clamped_coord, face);
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// Convert normal to spherical coordinates
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float theta, phi;
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vector_to_spherical(n, theta, phi);
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// Get tangent and binormal
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vec3 tangent, binormal;
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find_arbitrary_tangent(n, tangent, binormal);
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vec3 accum = vec3(0);
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for (int i = 0; i < sample_count; ++i)
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{
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vec2 xi = hammersley(i, sample_count);
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vec3 offset = importance_sample_lambert(xi);
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offset = normalize(tangent * offset.x + binormal * offset.y + n * offset.z);
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accum += textureLod(SourceCubemap, offset, 0).xyz;
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}
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accum /= sample_count;
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imageStore(DestCubemap, ivec3(clamped_coord, face), vec4(accum, 1));
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}
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