Sha256: f2e52fd8dd29f68f7504b305edeb1f0f8a34589c2860d85bbd2af9cb1c5452ed
Contents?: true
Size: 854 Bytes
Versions: 15
Compression:
Stored size: 854 Bytes
Contents
uniform sampler2D u_texture;
uniform float u_avgLuminance;
uniform float u_threshold;
uniform float u_offset;
varying vec2 v_textureCoordinates;
float key(float avg)
{
float guess = 1.5 - (1.5 / (avg * 0.1 + 1.0));
return max(0.0, guess) + 0.1;
}
// See section 9. "The bright-pass filter" of Realtime HDR Rendering
// http://www.cg.tuwien.ac.at/research/publications/2007/Luksch_2007_RHR/Luksch_2007_RHR-RealtimeHDR%20.pdf
void main()
{
vec4 color = texture2D(u_texture, v_textureCoordinates);
vec3 xyz = czm_RGBToXYZ(color.rgb);
float luminance = xyz.r;
float scaledLum = key(u_avgLuminance) * luminance / u_avgLuminance;
float brightLum = max(scaledLum - u_threshold, 0.0);
float brightness = brightLum / (u_offset + brightLum);
xyz.r = brightness;
gl_FragColor = vec4(czm_XYZToRGB(xyz), 1.0);
}
Version data entries
15 entries across 15 versions & 1 rubygems