source: trunk/neercs/video/radial.lolfx @ 1456 Tweet

-- GLSL.Vert --

#version 120

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

-- GLSL.Frag --

#version 120

uniform sampler2D texture;
uniform int screen_w;
uniform int screen_h;
uniform float time;
uniform float value1;
uniform float value2;
uniform float color;

float PI=3.14159265358979323846;

vec3 deform(in vec2 p)
        {
        vec2 uv;
        float zoom=0.5;
        uv.x=p.x*zoom-0.5;
        uv.y=p.y*zoom-0.5;
        return texture2D(texture,uv).xyz;
        }

void main(void)
        {
        int n=32;

        vec2 p=-1.0+4.0*gl_TexCoord[0].xy;
        vec2 s=p;
        vec3 source=deform(s);

        vec3 total=vec3(0,1.0,1.0);

        vec2 d=-p/float(n*2);
        float w=value1;
        for(int i=0;i<n;i++)
                {
                vec3 c=deform(s);
                vec3 data=c+vec3(c.x*color-p.x*color,c.z*color+p.y*color,c.y*color+p.x*color);
                total+=data*w;
                w*=value2;
                s+=d;
                }
        gl_FragColor=vec4(source*0.625+total*0.025,1.0);
        }