Shaders

bloom.frag

uniform sampler2D framebuffer;

float contrast(float c)
{
    float a = 0.3;
    return clamp((c - a) / (1 - a), 0, 1);
}

void main(void)
{
    float radius = 0.005;
    vec2 pos = gl_TexCoord[0].xy;
    float color = 0;
    float sum = 0;

    for(int x = -3; x < 4; x++)
    {
        for(int y = -3; y < 4; y++)
        {
            vec2 offset = vec2(x * radius, y * radius);
            float dist = exp(- sqrt(x * x + y * y) / 2);
            vec4 t = texture2D(framebuffer, pos + offset);
            color += contrast((t.r + t.g + t.b) / 3) * dist;
            sum += dist;
        }
    }

    color /= sum;

    vec4 tc = texture2D(framebuffer, pos) + vec4(color, color, color, 1) * 0.5;

    gl_FragColor = tc;
}

infrared.frag

uniform sampler2D framebuffer;

void main(void)
{
    vec4 c = texture2D(framebuffer, gl_TexCoord[0].xy);

    float val1 = c.r + 2 * c.g - 2 * c.b;
    float val2 = (c.r + c.g + c.b) / 3;

    float val = 0.8 * val1 + 0.2 * val2;

    float sum = (1.005 * (1 + c.g) + 1.005 * (1 + c.r) + 1) / 3;

    gl_FragColor = vec4(val * 1.005 * (1 + c.g) / sum, val * 1.005 * (1 + c.r) / sum, val / sum, 1);
}

vintage.frag

uniform sampler2D framebuffer;

float contrast(float c)
{
    float a = 0.09;
    return (c - a) / (1 - 2 * a);
}

void main(void)
{
    vec4 pixel = texture2D(framebuffer, gl_TexCoord[0].xy);

    pixel.r = contrast(pixel.r * 1.3);
    pixel.g = contrast(pixel.g + 0.05);
    pixel.b = contrast(pixel.b * 0.4 + 0.3);

    gl_FragColor = pixel;
}

water.frag

uniform sampler2D framebuffer;
uniform float t;

void main(void)
{
    vec2 pos = gl_TexCoord[0].xy;
    vec2 offset = vec2(sin(t + pos.x * 31), cos(t + pos.y * 37)) * 0.006;

    gl_FragColor = texture2D(framebuffer, offset + gl_TexCoord[0].xy) * vec4(0.5, 0.7, 1, 1);
}