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examples/symmetry: more cleanup

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This commit is contained in:
Matthias Schiffer 2016-02-03 15:41:24 +01:00
parent d5375d5308
commit 85cf184935
1 changed files with 35 additions and 11 deletions
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46
examples/symmetry.frag
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@ -14,31 +14,55 @@ const float sharpness = 300;
const float PI = 3.14159265358979323846; const float PI = 3.14159265358979323846;
mat2 rot(float a) { mat3 rot(float a) {
return mat2( return mat3(
cos(a), -sin(a), cos(a), -sin(a), 0,
sin(a), cos(a) sin(a), cos(a), 0,
0, 0, 1
); );
} }
float square(vec2 m, float a, float r, vec2 p) { mat3 scale(float s) {
vec2 diff = abs((m - p) * rot(r)); return mat3(
float d = max(diff.x, diff.y); s, 0, 0,
0, s, 0,
return clamp((a - d)*sharpness, 0.0, 1.0); 0, 0, 1
);
} }
mat3 trans(float x, float y) {
return mat3(
1, 0, x,
0, 1, y,
0, 0, 1
);
}
float square(vec3 p) {
float d = max(abs(p.x), abs(p.y));
return clamp((1 - d)*sharpness, 0.0, 1.0);
}
void main(void) { void main(void) {
vec2 m = res/2; vec2 m = res/2;
float s = min(m.x, m.y); float s = min(m.x, m.y);
vec2 p = (gl_FragCoord.xy - m) / s; vec3 p = vec3((gl_FragCoord.xy - m) / s, 1);
float scene = 0; float scene = 0;
int n = param0 + 32; int n = param0 + 32;
float k = param1; float k = param1;
for (int i = 0; i < n; i++) { for (int i = 0; i < n; i++) {
float c = square(vec2(0.5, 0) * rot(PI/2*(4.0*i/n)) * vec2(1, 1), 0.3 + 0.02 * param2, -PI/2*(k*i/n + time/1500), p * (1 + 0.03*param2)); mat3 t = scale(0.3 + 0.02 * param2)
* rot(-PI/2*(k*i/n + time/1500))
* trans(0.5, 0.0)
* rot(2*PI*i/n)
* scale(1 / (1 + 0.03 * param2));
float c = square(p * inverse(t));
scene = abs(scene - c); scene = abs(scene - c);
} }