1 files changed, 55 insertions, 0 deletions

diff --git a/res/shaders/glsl330/curved-line.fs b/res/shaders/glsl330/curved-line.fs
new file mode 100644
index 0000000..58e65ed
--- /dev/null
+++ b/res/shaders/glsl330/curved-line.fs
@@ -0,0 +1,55 @@
+#version 330 core
+
+#define PI 3.14159265359
+
+uniform vec2 resolution;
+uniform vec2 mouse;
+uniform float time;
+
+out vec4 color;
+
+float
+plot (vec2 st, float pct)
+{
+  return
+    smoothstep (pct - 0.02, pct,        st.y) -
+    smoothstep (pct,        pct + 0.02, st.y);
+}
+
+void
+main ()
+{
+  vec2 st = gl_FragCoord.xy/resolution;
+  vec2 mt = mouse/resolution;
+
+  float x = st.x;
+  float y;
+
+  y = pow (x, PI);
+  // y = exp (x - 1);
+  // y = log (x + 1);
+  // y = sqrt (x);
+  // y = step (mt.x, x);
+  // y = smoothstep (mt.x, 1 - mt.x, x);
+  // y =
+  //   smoothstep (.2, .5, x) -
+  //   smoothstep (.5, .8, x);
+  // y = (sin (2*PI*x + time) + 1)/2;
+  // y = (cos (2*PI*x + time) + 1)/2;
+  // y = mod (x, 1./4)*4;
+  // y = fract (x*4);
+  // y = ceil (x*4)/4;
+  // y = floor (x*4)/4;
+  // y = sign (x - 0.5);
+  // y = abs (x - 1./2)*2;
+  // y = (clamp (x, 1./4, 3./4) - 1./4)*2;
+  // y = min (1./2, x)*2;
+  // y = (max (.5, x) - 1./2)*2;
+
+  vec3 c = vec3 (y);
+
+  float pct = plot (st, y);
+  c = (1 - pct)*c + pct*vec3 (0, 1, 0);
+
+  color = vec4 (c, 1);
+}