diff options
Diffstat (limited to 'examples/polygon.frag')
| -rw-r--r-- | examples/polygon.frag | 46 |
1 files changed, 23 insertions, 23 deletions
diff --git a/examples/polygon.frag b/examples/polygon.frag index 20d5cdc..a018865 100644 --- a/examples/polygon.frag +++ b/examples/polygon.frag @@ -11,44 +11,44 @@ const float PI = 3.14159265358979323846; mat2 rot(float a) { - return mat2( - cos(a), -sin(a), - sin(a), cos(a) - ); + return mat2( + cos(a), -sin(a), + sin(a), cos(a) + ); } float poly(float n, vec2 m, float r, float rt, vec2 p) { - vec2 diff = (m - p) * rot(rt); - float d = length(diff); - float alpha = PI / n; - float gamma = mod(abs(atan(diff.x, diff.y)), alpha*2); + vec2 diff = (m - p) * rot(rt); + float d = length(diff); + float alpha = PI / n; + float gamma = mod(abs(atan(diff.x, diff.y)), alpha*2); - if (gamma > alpha) - gamma -= 2*alpha; + if (gamma > alpha) + gamma -= 2*alpha; - float r2 = r * cos(alpha) / cos(gamma); + float r2 = r * cos(alpha) / cos(gamma); - return clamp((r2 - d)*sharpness, 0.0, 1.0); + return clamp((r2 - d)*sharpness, 0.0, 1.0); } float poly_d(float n, vec2 m, float r, float rt, vec2 p) { - return poly(n, m, r, rt, p) - poly(n, m, r - 1/sharpness, rt, p); + return poly(n, m, r, rt, p) - poly(n, m, r - 1/sharpness, rt, p); } void main(void) { - vec2 m = res/2; - float s = min(m.x, m.y); - vec2 p = (gl_FragCoord.xy - m) / s; + vec2 m = res/2; + float s = min(m.x, m.y); + vec2 p = (gl_FragCoord.xy - m) / s; - float scene = 0; + float scene = 0; - float c; + float c; - c = poly_d(5 - 3*cos(time/1000), vec2(0, 0), 0.5, PI * time/1000, p); - scene = abs(scene - c); + c = poly_d(5 - 3*cos(time/1000), vec2(0, 0), 0.5, PI * time/1000, p); + scene = abs(scene - c); - c = poly_d(5 - 3*cos(time/1000), vec2(0, 0), 0.5, -PI * time/1000, p); - scene = abs(scene - c); + c = poly_d(5 - 3*cos(time/1000), vec2(0, 0), 0.5, -PI * time/1000, p); + scene = abs(scene - c); - fragColor = vec4(vec3(1, 1, 1) * scene, 1); + fragColor = vec4(vec3(1, 1, 1) * scene, 1); } |