diff options
Diffstat (limited to 'examples/squares.frag')
-rw-r--r-- | examples/squares.frag | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/examples/squares.frag b/examples/squares.frag new file mode 100644 index 0000000..fd5dc94 --- /dev/null +++ b/examples/squares.frag @@ -0,0 +1,42 @@ +#version 330 + +out vec4 fragColor; + +uniform vec2 res; +uniform float time; + +const float sharpness = 500; + +mat2 rot(float a) { + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); +} + +float square(vec2 m, float a, float r, vec2 p) { + vec2 diff = abs((m - p) * rot(r)); + float d = max(diff.x, diff.y); + + return clamp((a - d)*sharpness, 0.0, 1.0); +} + +void main(void) { + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; + + float a = atan(p.x, p.y); + + float x = mod(p.x, 0.1); + float y = mod(p.y, 0.1); + + float scene = 0; + + for (int i = 1; i <= 50; i++) { + float c = square(vec2(0.5, 0) * rot(time/500/i), 0.1 + 0.005*i, time/500/i + time/(100*i), p); + scene = abs(scene - c); + } + + fragColor = vec4(vec3(1, 1, 1) * scene, 1); +} |