slang-shaders/reshade/shaders/vibrance-pass-sh1nra358.slang
2017-05-29 22:04:55 -05:00

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#version 450
/**
* Vibrance
* by Christian Cann Schuldt Jensen ~ CeeJay.dk
*
* Vibrance intelligently boosts the saturation of pixels so pixels that had little color get a larger boost than pixels that had a lot.
* This avoids oversaturation of pixels that were already very saturated.
*/
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
} params;
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;
}
#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source;
void main()
{
#ifndef Vibrance_RGB_balance //for backwards compatibility with setting presets for older version.
#define Vibrance_RGB_balance vec3(1.00, 1.00, 1.00)
#endif
#define Vibrance 0.5
#define Vibrance_coeff vec3(Vibrance_RGB_balance.r * Vibrance, Vibrance_RGB_balance.g * Vibrance, Vibrance_RGB_balance.b * Vibrance)
vec3 col = texture(Source, vTexCoord).rgb;
vec3 lumCoeff = vec3(0.212656, 0.715158, 0.072186); //Values to calculate luma with
float luma = dot(lumCoeff, col); //calculate luma (grey)
float max_color = max(col.r, max(col.g,col.b)); //Find the strongest color
float min_color = min(col.r, min(col.g,col.b)); //Find the weakest color
float color_saturation = max_color - min_color; //The difference between the two is the saturation
col.r = mix(luma, col.r, (1.0 + (Vibrance_coeff.r * (1.0 - (sign(Vibrance_coeff.r) * color_saturation)))));
col.g = mix(luma, col.g, (1.0 + (Vibrance_coeff.g * (1.0 - (sign(Vibrance_coeff.g) * color_saturation)))));
col.b = mix(luma, col.b, (1.0 + (Vibrance_coeff.b * (1.0 - (sign(Vibrance_coeff.b) * color_saturation)))));
FragColor = vec4(col, 1.0);
}