source: trunk/tools/neercs/video/color.lolfx @ 1913 Tweet

-- GLSL.Vert --

#version 120

void main()
    {
    gl_Position=gl_Vertex;
    gl_TexCoord[0]=gl_MultiTexCoord0;
    }

-- GLSL.Frag --

#version 120

uniform sampler2D texture;
uniform vec2 screen_size;
uniform vec3 filter;
uniform vec4 color;
uniform float flash;

void main(void)
    {
    vec2 p=gl_FragCoord.xy/screen_size.xy;
    vec3 c=texture2D(texture,p).xyz;

    float a=(c.x+c.y+c.z)/3.0;
    c=mix(c,vec3(a),color.w);                                // grayscale
    c*=filter;                                               // filter
    c+=color.z;                                              // level
    c*=color.x;                                              // brightness
    c=0.5+(c-0.5)*color.y;                                   // contrast
    c+=flash;                                                // flash

    gl_FragColor=vec4(c,1.0);
    }