color_mangler

/*
   Color Mangler
   Author: hunterk
   License: Public domain
*/

#pragma parameter display_gamma "Display Gamma" 2.2 0.0 10.0 0.1
#pragma parameter target_gamma "Target Gamma" 2.2 0.0 10.0 0.1
#pragma parameter sat "Saturation" 1.0 0.0 3.0 0.01
#pragma parameter lum "Luminance" 1.0 0.0 5.0 0.01
#pragma parameter cntrst "Contrast" 1.0 0.0 2.0 0.01
#pragma parameter vignette "Vignette Toggle" 1.0 0.0 1.0 1.0
#pragma parameter hotspot "Hotspot" 0.0 0.0 1.0 0.1
#pragma parameter inner "Inner Ring" 0.35 0.0 1.0 0.01
#pragma parameter outer "Outer Ring" 0.7 0.0 1.0 0.01
#pragma parameter r "Red" 1.0 0.0 2.0 0.01
#pragma parameter g "Green" 1.0 0.0 2.0 0.01
#pragma parameter b "Blue" 1.0 0.0 2.0 0.01
#pragma parameter rg "Red-Green Tint" 0.0 0.0 1.0 0.005
#pragma parameter rb "Red-Blue Tint" 0.0 0.0 1.0 0.005
#pragma parameter gr "Green-Red Tint" 0.0 0.0 1.0 0.005
#pragma parameter gb "Green-Blue Tint" 0.0 0.0 1.0 0.005
#pragma parameter br "Blue-Red Tint" 0.0 0.0 1.0 0.005
#pragma parameter bg "Blue-Green Tint" 0.0 0.0 1.0 0.005
#pragma parameter blr "Black-Red Tint" 0.0 0.0 1.0 0.005
#pragma parameter blg "Black-Green Tint" 0.0 0.0 1.0 0.005
#pragma parameter blb "Black-Blue Tint" 0.0 0.0 1.0 0.005


#if defined(VERTEX)

#if __VERSION__ >= 130
#define COMPAT_VARYING out
#define COMPAT_ATTRIBUTE in
#define COMPAT_TEXTURE texture
#else
#define COMPAT_VARYING varying
#define COMPAT_ATTRIBUTE attribute
#define COMPAT_TEXTURE texture2D
#endif

#ifdef GL_ES
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif

COMPAT_ATTRIBUTE vec4 VertexCoord;
COMPAT_ATTRIBUTE vec4 COLOR;
COMPAT_ATTRIBUTE vec4 TexCoord;
COMPAT_VARYING vec4 COL0;
COMPAT_VARYING vec4 TEX0;

uniform mat4 MVPMatrix;
uniform COMPAT_PRECISION int FrameDirection;
uniform COMPAT_PRECISION int FrameCount;
uniform COMPAT_PRECISION vec2 OutputSize;
uniform COMPAT_PRECISION vec2 TextureSize;
uniform COMPAT_PRECISION vec2 InputSize;

// compatibility #defines
#define vTexCoord TEX0.xy
#define SourceSize vec4(TextureSize, 1.0 / TextureSize) //either TextureSize or InputSize
#define OutSize vec4(OutputSize, 1.0 / OutputSize)

void main()
{
   gl_Position = MVPMatrix * VertexCoord;
   TEX0.xy = TexCoord.xy;
}

#elif defined(FRAGMENT)

#ifdef GL_ES
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
#define COMPAT_PRECISION mediump
#else
#define COMPAT_PRECISION
#endif

#if __VERSION__ >= 130
#define COMPAT_VARYING in
#define COMPAT_TEXTURE texture
out COMPAT_PRECISION vec4 FragColor;
#else
#define COMPAT_VARYING varying
#define FragColor gl_FragColor
#define COMPAT_TEXTURE texture2D
#endif

uniform COMPAT_PRECISION int FrameDirection;
uniform COMPAT_PRECISION int FrameCount;
uniform COMPAT_PRECISION vec2 OutputSize;
uniform COMPAT_PRECISION vec2 TextureSize;
uniform COMPAT_PRECISION vec2 InputSize;
uniform sampler2D Texture;
COMPAT_VARYING vec4 TEX0;

// compatibility #defines
#define Source Texture
#define vTexCoord TEX0.xy

#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 display_gamma;
uniform COMPAT_PRECISION float target_gamma;
uniform COMPAT_PRECISION float sat;
uniform COMPAT_PRECISION float lum;
uniform COMPAT_PRECISION float cntrst;
uniform COMPAT_PRECISION float blr;
uniform COMPAT_PRECISION float blg;
uniform COMPAT_PRECISION float blb;
uniform COMPAT_PRECISION float r;
uniform COMPAT_PRECISION float g;
uniform COMPAT_PRECISION float b;
uniform COMPAT_PRECISION float rg;
uniform COMPAT_PRECISION float rb;
uniform COMPAT_PRECISION float gr;
uniform COMPAT_PRECISION float gb;
uniform COMPAT_PRECISION float br;
uniform COMPAT_PRECISION float bg;
uniform COMPAT_PRECISION float hotspot;
uniform COMPAT_PRECISION float vignette;
uniform COMPAT_PRECISION float inner;
uniform COMPAT_PRECISION float outer;
#else
#define display_gamma 2.2
#define target_gamma 2.2
#define sat 1.0
#define lum 1.0
#define cntrst 1.0
#define blr 0.0
#define blg 0.0
#define blb 0.0
#define r 1.0
#define g 1.0
#define b 1.0
#define rg 0.0
#define rb 0.0
#define gr 0.0
#define gb 0.0
#define br 0.0
#define bg 0.0
#define inner 0.0
#define outer 1.0
#define hotspot 1.0
#define vignette 1.0
#endif

void main()
{

    vec3 vcolor = COMPAT_TEXTURE(Source, TEX0.xy).rgb;
// a simple calculation for the vignette/hotspot effects
    vec2 mid = vec2(0.49999, 0.49999) * InputSize / TextureSize;
    vec2 middle = TEX0.xy - mid;
    float len = length(middle);
    float vig = smoothstep(inner, outer, len);

    vcolor *= (vignette > 0.5) ? (1.0 - vig) : 1.0; // Vignette
    vcolor += ((1.0 - vig) * 0.2) * hotspot; // Hotspot
    vec4 vignetted = vec4(vcolor,1.0);


   vec4 screen = pow(vignetted, vec4(target_gamma)).rgba;
   vec4 avglum = vec4(0.5);
   screen = mix(screen, avglum, (1.0 - cntrst));

                   //  r    g    b  alpha ; alpha does nothing for our purposes
   mat4 color = mat4(  r,  rg,  rb, 0.0,  //red tint
                      gr,   g,  gb, 0.0,  //green tint
                      br,  bg,   b, 0.0,  //blue tint
                     blr, blg, blb, 0.0); //black tint

   mat4 adjust = mat4((1.0 - sat_r) * 0.2126 + sat_r, (1.0 - sat_r) * 0.2126, (1.0 - sat_r) * 0.2126, 1.0,
                      (1.0 - sat_g) * 0.7152, (1.0 - sat_g) * 0.7152 + sat_g, (1.0 - sat_g) * 0.7152, 1.0,
                      (1.0 - sat_b) * 0.0722, (1.0 - sat_b) * 0.0722, (1.0 - sat_b) * 0.0722 + sat_b, 1.0,
                      0.0, 0.0, 0.0, 1.0);
   color *= adjust;
   screen = clamp(screen * lum, 0.0, 1.0);
   screen = color * screen;


    FragColor = pow(screen, vec4(1.0 / display_gamma));


}
#endif