diff options
Diffstat (limited to 'common/shaders/heptagon.wgsl')
| -rw-r--r-- | common/shaders/heptagon.wgsl | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/common/shaders/heptagon.wgsl b/common/shaders/heptagon.wgsl index 3bfc59d..078978a 100644 --- a/common/shaders/heptagon.wgsl +++ b/common/shaders/heptagon.wgsl @@ -19,12 +19,11 @@ struct VertexOutput { } fn sdf_heptagon(p: vec2<f32>, r: f32) -> f32 { - let k = vec3<f32>(0.868516, -0.495754, 0.357407); - var p_abs = abs(p); - p_abs -= 2.0 * k.xy * min(dot(k.xy, p_abs), 0.0); - p_abs -= 2.0 * vec2<f32>(-k.x, k.y) * min(dot(vec2<f32>(-k.x, k.y), p_abs), 0.0); - p_abs -= vec2<f32>(clamp(p_abs.x, -k.z * r, k.z * r), r); - return length(p_abs) * sign(p_abs.y); + let an = 3.141593 / 7.0; // PI/7 for heptagon + let acs = vec2<f32>(cos(an), sin(an)); + let bn = (atan2(p.x, p.y) % (2.0 * an)) - an; + let q = length(p) * vec2<f32>(cos(bn), abs(sin(bn))); + return length(q - r * acs) * sign(q.x - r * acs.x); } @fragment fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> { @@ -39,7 +38,7 @@ fn sdf_heptagon(p: vec2<f32>, r: f32) -> f32 { uv.x * s + uv.y * c ); - let dist = sdf_heptagon(rot_uv, 0.5); + let dist = sdf_heptagon(rot_uv, 0.3); let color = mix(vec3<f32>(0.2, 0.4, 0.8), vec3<f32>(1.0, 0.8, 0.2), smoothstep(0.01, -0.01, dist)); |