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fix lut shader's low precision in the blue channel

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This commit is contained in:
hunterk 2017-06-05 13:46:15 -05:00
parent 6df0d2b490
commit ee7124688f
1 changed files with 13 additions and 17 deletions
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30
reshade/shaders/LUT/LUT.glsl
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@ -1,18 +1,5 @@
// Compatibility #ifdefs needed for parameters
#ifdef GL_ES
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif
// Parameter lines go here:
#pragma parameter LUT_Size "LUT Size" 16.0 16.0 64.0 1.0
#ifdef PARAMETER_UNIFORM
// All parameter floats need to have COMPAT_PRECISION in front of them
uniform COMPAT_PRECISION float LUT_Size;
#else
#define LUT_Size 16.0
#endif
#if defined(VERTEX)
@ -96,13 +83,22 @@ COMPAT_VARYING vec4 TEX0;
#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
#define OutSize vec4(OutputSize, 1.0 / OutputSize)
#ifdef PARAMETER_UNIFORM
uniform COMPAT_PRECISION float LUT_Size;
#else
#define LUT_Size 16.0
#endif
void main()
{
vec4 imgColor = pow(texture(Source, vTexCoord.xy), vec4(2.2));
vec4 imgColor = texture(Source, vTexCoord.xy);
float red = ( imgColor.r * (LUT_Size - 1.0) + 0.5 ) / (LUT_Size * LUT_Size);
float green = ( imgColor.g * (LUT_Size - 1.0) + 0.5 ) / LUT_Size;
float blue = floor( imgColor.b * (LUT_Size - 1.0) ) / LUT_Size;
vec4 color = texture( SamplerLUT, vec2( blue + red, green ));
FragColor = pow(color, vec4(1.0 / 2.2));
float blue1 = floor( imgColor.b * (LUT_Size - 1.0) ) / LUT_Size;
float blue2 = ceil( imgColor.b * (LUT_Size - 1.0) ) / LUT_Size;
float mixer = (imgColor.b - (blue1 + red)) / ((blue2 + red) - (blue1 + red));
vec4 color1 = texture( SamplerLUT, vec2( blue1 + red, green ));
vec4 color2 = texture( SamplerLUT, vec2( blue2 + red, green ));
FragColor = mix(color1, color2, mixer);
}
#endif