26 lines
662 B
GLSL
26 lines
662 B
GLSL
// Swirl effect parameters
|
|
uniform float radius;
|
|
uniform float angle;
|
|
uniform float center_x;
|
|
uniform float center_y;
|
|
uniform vec2 resolution;
|
|
|
|
vec4 process(vec4 col) {
|
|
vec2 center = vec2((resolution.x*0.5)+center_x, (resolution.y*0.5)+center_y);
|
|
|
|
vec2 uv = v_texcoord.st;
|
|
|
|
vec2 tc = uv * resolution;
|
|
tc -= center;
|
|
float dist = length(tc);
|
|
if (dist < radius) {
|
|
float percent = (radius - dist) / radius;
|
|
float theta = percent * percent * (-angle*0.05) * 8.0;
|
|
float s = sin(theta);
|
|
float c = cos(theta);
|
|
tc = vec2(dot(tc, vec2(c, -s)), dot(tc, vec2(s, c)));
|
|
}
|
|
tc += center;
|
|
|
|
return texture2D(texture, tc / resolution);
|
|
} |