shadron SWE flag

#define H 1.0
#define W 1.6

#define Cross 0.2
#define Q1x 0.5
#define Q1y 0.4


const vec3 YELLOW = vec3(0.9960784313725490196078431372549, 0.8, 0.0);
const vec3 BLUE = vec3(0.0, 0.41568627450980392156862745098039, 0.65490196078431372549019607843137);

const ivec2 DIMENSIONS = ivec2(1600, 1000);

glsl vec3 SwedishFlag ( vec2 coord ) {
    vec2 pos = vec2( W, H ) * coord;
    if ( pos.x < Q1x && pos.y < Q1y ) {
        return BLUE;
    } else if ( pos.x > Q1x + Cross && pos.y < Q1y ) {
        return BLUE;
    } else if ( pos.x < Q1x && pos.y > Q1y + Cross ) {
        return BLUE;
    } else if ( pos.x > Q1x + Cross && pos.y > Q1y + Cross ) {
        return BLUE;
    }
    return YELLOW;
}

image Sweden = glsl(SwedishFlag, DIMENSIONS);

param float diffFactor = 1.0 : logrange (1.0, 256.0);
//image Reference = file();

glsl vec3 Compare(vec2 coord) {
    vec3 a = texture( Reference, coord ).rgb;
    vec3 b = texture( Sweden, coord ).rgb;
    return diffFactor * abs( b - a );
}

//image Differance = glsl(Compare, DIMENSIONS);