Remove backtrace fork for emscripten.

[mandelwow.git] / mandelwow.frag

diff --git a/mandelwow.frag b/mandelwow.frag
index 3795fd46efcecef10ac54fc6a781e58f59936737..c2e4e2d728c2fb45b36b49c26bd1e56fc3583389 100644 (file)
--- a/mandelwow.frag
+++ b/mandelwow.frag
@@ -1,28 +1,25 @@
-#version 140
+#version 100
 precision highp float;
-in vec2 c;
-in vec2 z;
-out vec4 f_color;
+varying vec2 c;
+varying vec2 z;
 
 void main() {
     float zx = z.x;
     float zy = z.y;
-    int maxiter = 64;
-    int iter = maxiter;
-    while (iter > 0) {
+    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);
-          f_color = vec4(index, 0.1, 0.5 - index / 2, 0.8 - index);
+          gl_FragColor = vec4(index, 0.1, 1.0 - index / 2.0, 0.8 - index);
           return;
         }
         zy = zx * zy * 2.0 + c.y;
         zx = zx2 - zy2 + c.x;
-        iter -= 1;
     }
-    f_color = vec4((sin(z.y) + 1.0) / 2,
-                   (sin(c.y) + 1.0) / 2,
-                   (sin(c.x) + 1.0) / 2,
-                   1.0);
+    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);
 }