port from perforce

hgplus/ShaderMinifier/tests/real/julia.frag

@@ -0,0 +1,25 @@
+uniform vec2 resolution;
+uniform float time;
+uniform sampler2D tex0;
+uniform sampler2D tex1;
+uniform sampler2D tex2;
+uniform sampler2D tex3;
+
+void main(void)
+{
+    vec2 p = -1.0 + 2.0 * gl_FragCoord.xy / resolution.xy;
+    vec2 cc = vec2( cos(.25*time), sin(.25*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);
+}