diff options
Diffstat (limited to 'src/sdf.rs')
| -rw-r--r-- | src/sdf.rs | 24 |
1 files changed, 24 insertions, 0 deletions
@@ -81,6 +81,10 @@ impl R3ToR { pub fn min(a: Self, b: Self) -> Self { Self::Min(Box::new(a), Box::new(b)) } + + pub fn smooth_min(a: Self, b: Self) -> Self { + Self::SmoothMin(Box::new(a), Box::new(b)) + } } struct VarCounter { @@ -191,6 +195,19 @@ impl Function for R3ToR { var.next() ); }, + SmoothMin(a, b) => { + let a_output = a.to_glsl(input, code, var); + let b_output = b.to_glsl(input, code, var); + // for now we're using a fixed k value + // i don't want to make this a Constant right now, + // since most values of k (i.e. <0, >1) look bad/just like min. + let k = 0.2; + write_str!( + code, + "float v{} = smooth_min(v{a_output}, v{b_output}, {k});\n", + var.next() + ); + }, _ => todo!(), } @@ -212,6 +229,13 @@ impl Sdf { /// appends some glsl code including a function `float sdf(vec3) { ... }` pub fn to_glsl(&self, code: &mut String) { + code.push_str(" +float smooth_min(float a, float b, float k) { + k = clamp(k, 0.0, 1.0); + float h = max(k-abs(a-b), 0.0)/k; + return min(a, b) - h*h*h*k*(1.0/6.0); +} +"); code.push_str("float sdf(vec3 p) {\n"); let mut var = VarCounter::new(); write_str!(code, "vec3 v{} = p;\n", var.next()); |