mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-11-23 00:01:31 +11:00
73 lines
2.1 KiB
Plaintext
Executable file
73 lines
2.1 KiB
Plaintext
Executable file
#version 450
|
|
|
|
// A version of the LUT shader that loads 2 LUTs.
|
|
|
|
layout(push_constant) uniform Push
|
|
{
|
|
vec4 SourceSize;
|
|
vec4 OriginalSize;
|
|
vec4 OutputSize;
|
|
uint FrameCount;
|
|
float LUT_selector_param;
|
|
} params;
|
|
|
|
#pragma parameter LUT_selector_param "LUT Selector" 1.0 1.0 2.0 1.0
|
|
int LUT_selector = int(params.LUT_selector_param);
|
|
|
|
layout(std140, set = 0, binding = 0) uniform UBO
|
|
{
|
|
mat4 MVP;
|
|
} global;
|
|
|
|
#pragma stage vertex
|
|
layout(location = 0) in vec4 Position;
|
|
layout(location = 1) in vec2 TexCoord;
|
|
layout(location = 0) out vec2 vTexCoord;
|
|
|
|
void main()
|
|
{
|
|
gl_Position = global.MVP * Position;
|
|
vTexCoord = TexCoord * 1.0001;
|
|
}
|
|
|
|
#pragma stage fragment
|
|
layout(location = 0) in vec2 vTexCoord;
|
|
layout(location = 0) out vec4 FragColor;
|
|
layout(set = 0, binding = 2) uniform sampler2D Source;
|
|
layout(set = 0, binding = 3) uniform sampler2D SamplerLUT1;
|
|
layout(set = 0, binding = 4) uniform sampler2D SamplerLUT2;
|
|
|
|
// 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()
|
|
{
|
|
float LUT_Size = mix(textureSize(SamplerLUT1, 0).y, textureSize(SamplerLUT2, 0).y, params.LUT_selector_param - 1.0);
|
|
vec4 imgColor = texture(Source, vTexCoord.xy);
|
|
vec4 color1, color2 = vec4(0.,0.,0.,0.);
|
|
float red, green, blue1, blue2, mixer = 0.0;
|
|
|
|
red = ( imgColor.r * (LUT_Size - 1.0) + 0.4999 ) / (LUT_Size * LUT_Size);
|
|
green = ( imgColor.g * (LUT_Size - 1.0) + 0.4999 ) / LUT_Size;
|
|
blue1 = (floor( imgColor.b * (LUT_Size - 1.0) ) / LUT_Size) + red;
|
|
blue2 = (ceil( imgColor.b * (LUT_Size - 1.0) ) / LUT_Size) + red;
|
|
mixer = clamp(max((imgColor.b - blue1) / (blue2 - blue1), 0.0), 0.0, 32.0);
|
|
|
|
if(LUT_selector == 1)
|
|
{
|
|
color1 = texture( SamplerLUT1, vec2( blue1, green ));
|
|
color2 = texture( SamplerLUT1, vec2( blue2, green ));
|
|
}
|
|
else
|
|
{
|
|
color1 = texture( SamplerLUT2, vec2( blue1, green ));
|
|
color2 = texture( SamplerLUT2, vec2( blue2, green ));
|
|
}
|
|
FragColor = mixfix(color1, color2, mixer);
|
|
}
|