Programs

1 files changed, 21 insertions, 0 deletions

diff --git a/src/fshader_common.glsl b/src/fshader_common.glsl
new file mode 100644
index 0000000..558b20f
--- /dev/null
+++ b/src/fshader_common.glsl
@@ -0,0 +1,21 @@
+
+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);
+}
+
+// thanks to https://iquilezles.org/articles/distfunctions/
+float sdf_box_frame(vec3 p, vec3 b, float e) {
+	p = abs(p)-b;
+	vec3 q = abs(p+e)-e;
+	return min(min(
+		length(max(vec3(p.x,q.y,q.z),0.0))+min(max(p.x,max(q.y,q.z)),0.0),
+		length(max(vec3(q.x,p.y,q.z),0.0))+min(max(q.x,max(p.y,q.z)),0.0)),
+		length(max(vec3(q.x,q.y,p.z),0.0))+min(max(q.x,max(q.y,p.z)),0.0));
+}
+
+float sdf_torus(vec3 p, vec2 t) {
+	vec2 q = vec2(length(p.xy)-t.x,p.z);
+	return length(q)-t.y;
+}