Move shaders and textures into subdirectories.

[mandelwow.git] / shaders / mandelwow.frag

diff --git a/shaders/mandelwow.frag b/shaders/mandelwow.frag
new file mode 100644 (file)
index 0000000..0551a34
--- /dev/null
+++ b/shaders/mandelwow.frag
@@ -0,0 +1,25 @@
+#version 100
+precision highp float;
+varying vec2 c;
+varying vec2 z;
+
+void main() {
+    float zx = z.x;
+    float zy = z.y;
+    const int maxiter = 64;
+    for (int iter = maxiter; iter > 0; iter--) {
+        float zx2 = zx * zx;
+        float zy2 = zy * zy;
+        if (zx2 * zy2 > 4.0) {
+          float index = float(iter) / float(maxiter);
+          gl_FragColor = vec4(index, 0.1, 1.0 - index / 2.0, 0.8 - index * index);
+          return;
+        }
+        zy = zx * zy * 2.0 + c.y;
+        zx = zx2 - zy2 + c.x;
+    }
+    gl_FragColor = vec4((sin(z.y) + 1.0) / 4.0,
+                        (sin(z.x) + 1.0) / 4.0,
+                        (sin(c.x) + 1.0) / 4.0,
+                        1.0);
+}