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Improve ibl specular reflexion using mipmap chain

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Vincent Lejeune 2014-10-22 14:49:06 +02:00
parent 86b8036926
commit 9ca4d7e3e6
1 changed files with 3 additions and 1 deletions
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data/shaders/diffuseenvmap.frag
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@ -50,7 +50,9 @@ void main(void)
sampleDirection = (InverseViewMatrix * vec4(sampleDirection, 0.)).xyz; sampleDirection = (InverseViewMatrix * vec4(sampleDirection, 0.)).xyz;
float specval = texture(ntex, uv).z; float specval = texture(ntex, uv).z;
float lodval = 16 * (1. - ((log2(specval) - 1.) / 10.)); // From http://graphics.cs.williams.edu/papers/EnvMipReport2013/
int texSize = textureSize(tex, 0).x;
float lodval = log2(texSize * sqrt(3)) - .5 * log2(specval + 1);
vec4 specular = textureLod(tex, sampleDirection, lodval); vec4 specular = textureLod(tex, sampleDirection, lodval);
Spec = max(specular, vec4(0.)); Spec = max(specular, vec4(0.));
} }