port from perforce

hgplus/ShaderMinifier/tests/real/extatique/skybox.fs

@@ -0,0 +1,32 @@
+uniform sampler2D tex;
+uniform float angle;
+uniform float time;
+varying vec3 pos;
+
+
+
+vec4 getEnvColor(vec3 p)
+{
+	float az = atan(p.x, p.y + 0.01);
+	float ax = -pos.z;
+	
+	vec4 sample = vec4(0.0);
+	
+	for (int i = 0; i < 8; ++i)
+	{
+		float fi = float(i);
+		float s = ax * 1.0 / (1.0 + fi) + time * 0.01 * (2.0 + fi);
+		float t = angle + (2.5) * az / 3.14159;
+		
+		sample += texture2D(tex, vec2(s,t)) / (1.0 + 0.3 * fi);
+	}
+	return sample;
+}
+
+
+
+void main()
+{	
+	vec4 env = getEnvColor(pos);
+	gl_FragColor = vec4(env.xyz, 1.0);
+}