alex/slang-shaders
1
0
Fork 0
mirror of https://github.com/italicsjenga/slang-shaders.git synced 2024-11-26 01:11:32 +11:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'master' of https://github.com/libretro/slang-shaders

Browse source
This commit is contained in:
hunterk 2017-06-30 14:36:02 -05:00
parent 8f9d55d7cf 0fe263d93a
commit e80de6e8fb
1 changed files with 18 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
reshade/shaders/LUT/LUT.slang
View file

@ -9,7 +9,7 @@ layout(push_constant) uniform Push
float LUT_Size; float LUT_Size;
} params; } params;
#pragma parameter LUT_Size "LUT Size" 16.0 16.0 64.0 1.0 #pragma parameter LUT_Size "LUT Size" 16.0 1.0 64.0 1.0
layout(std140, set = 0, binding = 0) uniform UBO layout(std140, set = 0, binding = 0) uniform UBO
{ {
@ -24,7 +24,7 @@ layout(location = 0) out vec2 vTexCoord;
void main() void main()
{ {
gl_Position = global.MVP * Position; gl_Position = global.MVP * Position;
vTexCoord = TexCoord; vTexCoord = TexCoord * 1.0001;
} }
#pragma stage fragment #pragma stage fragment
@ -33,15 +33,23 @@ layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source; layout(set = 0, binding = 2) uniform sampler2D Source;
layout(set = 0, binding = 3) uniform sampler2D SamplerLUT; layout(set = 0, binding = 3) uniform sampler2D SamplerLUT;
// This shouldn't be necessary but it seems some undefined values can
// creep in and each GPU vendor handles that differently. This keeps
// all values within a safe range
vec4 mixfix(vec4 a, vec4 b, float c)
{
return (a.z < 1.0) ? mix(a, b, c) : a;
}
void main() void main()
{ {
vec4 imgColor = texture(Source, vTexCoord.xy); vec4 imgColor = texture(Source, vTexCoord.xy);
float red = ( imgColor.r * (params.LUT_Size - 1.0) + 0.5 ) / (params.LUT_Size * params.LUT_Size); float red = ( imgColor.r * (params.LUT_Size - 1.0) + 0.4999 ) / (params.LUT_Size * params.LUT_Size);
float green = ( imgColor.g * (params.LUT_Size - 1.0) + 0.5 ) / params.LUT_Size; float green = ( imgColor.g * (params.LUT_Size - 1.0) + 0.4999 ) / params.LUT_Size;
float blue1 = floor( imgColor.b * (params.LUT_Size - 1.0) ) / params.LUT_Size; float blue1 = (floor( imgColor.b * (params.LUT_Size - 1.0) ) / params.LUT_Size) + red;
float blue2 = ceil( imgColor.b * (params.LUT_Size - 1.0) ) / params.LUT_Size; float blue2 = (ceil( imgColor.b * (params.LUT_Size - 1.0) ) / params.LUT_Size) + red;
float mixer = (imgColor.b - (blue1 + red)) / ((blue2 + red) - (blue1 + red)); float mixer = max((imgColor.b - blue1) / (blue2 - blue1), 0.0);
vec4 color1 = texture( SamplerLUT, vec2( blue1 + red, green )); vec4 color1 = texture( SamplerLUT, vec2( blue1, green ));
vec4 color2 = texture( SamplerLUT, vec2( blue2 + red, green )); vec4 color2 = texture( SamplerLUT, vec2( blue2, green ));
FragColor = mix(color1, color2, mixer); FragColor = mixfix(color1, color2, mixer);
} }