updated from old repo

1 files changed, 25 insertions, 0 deletions

diff --git a/assets/shaders/Julia.frag.glsl b/assets/shaders/Julia.frag.glsl
new file mode 100644
index 00000000..68cda703
--- /dev/null
+++ b/assets/shaders/Julia.frag.glsl
@@ -0,0 +1,25 @@
+#ifdef GL_ES
+precision highp float;
+#endif
+
+uniform vec2 u_resolution;
+uniform float u_time;
+
+void main(void)
+{
+    vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / u_resolution.xy;
+    vec2 cc = vec2( cos(.25*u_time), sin(.25*u_time*1.423) );
+
+    float dmin = 1000.0;
+    vec2 z  = p*vec2(1.33,1.0);
+    for( int i=0; i<64; i++ )
+    {
+        z = cc + vec2( z.x*z.x - z.y*z.y, 2.0*z.x*z.y );
+        float m2 = dot(z,z);
+        if( m2>100.0 ) break;
+        dmin=min(dmin,m2);
+        }
+
+    float color = sqrt(sqrt(dmin))*0.7;
+    gl_FragColor = vec4(color,color,color,1.0);
+}
\ No newline at end of file