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46 lines
1,017 B
Scala
46 lines
1,017 B
Scala
$input v_dir
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/*
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* Copyright 2014-2016 Dario Manesku. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
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*/
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#include "../common/common.sh"
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#include "uniforms.sh"
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SAMPLERCUBE(s_texCube, 0);
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SAMPLERCUBE(s_texCubeIrr, 1);
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// Ref: http://the-witness.net/news/2012/02/seamless-cube-map-filtering/
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vec3 fixCubeLookup(vec3 _v, float _lod, float _topLevelCubeSize)
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{
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float ax = abs(_v.x);
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float ay = abs(_v.y);
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float az = abs(_v.z);
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float vmax = max(max(ax, ay), az);
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float scale = 1.0 - exp2(_lod) / _topLevelCubeSize;
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if (ax != vmax) { _v.x *= scale; }
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if (ay != vmax) { _v.y *= scale; }
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if (az != vmax) { _v.z *= scale; }
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return _v;
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}
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void main()
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{
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vec3 dir = normalize(v_dir);
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vec4 color;
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if (u_bgType == 7.0)
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{
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color = toLinear(textureCube(s_texCubeIrr, dir));
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}
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else
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{
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float lod = u_bgType;
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dir = fixCubeLookup(dir, lod, 256.0);
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color = toLinear(textureCubeLod(s_texCube, dir, lod));
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}
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color *= exp2(u_exposure);
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gl_FragColor = toFilmic(color);
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}
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