Faces stuff + simple camera rotation

2 files changed, 11 insertions, 0 deletions

diff --git a/src/main/resources/shaders/modules/sdf.glsl b/src/main/resources/shaders/modules/sdf.glsl
index 8121b18..9051339 100644
--- a/src/main/resources/shaders/modules/sdf.glsl
+++ b/src/main/resources/shaders/modules/sdf.glsl
@@ -10,3 +10,9 @@ float sdf_box(in vec3 p, in vec3 dimens, in float rounding) {
   vec3 q = abs(p) - dimens + rounding;
   return length(max(q, 0.0)) + min(max(q.x, max(q.y, q.z)), 0.0) - rounding;
 }
+
+float sd_ellipsoid(vec3 p, vec3 r) {
+  float k0 = length(p / r);
+  float k1 = length(p / (r * r));
+  return k0 * (k0 - 1.0) / k1;
+}
diff --git a/src/main/resources/shaders/modules/utils.glsl b/src/main/resources/shaders/modules/utils.glsl
index 1616e8c..6908f3b 100644
--- a/src/main/resources/shaders/modules/utils.glsl
+++ b/src/main/resources/shaders/modules/utils.glsl
@@ -2,3 +2,8 @@ float smin(float a, float b, float k) {
   float h = clamp(0.5 + 0.5 * (b - a) / k, 0.0, 1.0);
   return mix(b, a, h) - k * h * (1.0 - h);
 }
+
+float ssubtract(float a, float b, float k) {
+  return -smin(-a, b, k);
+}
+