#pragma strict

@script ExecuteInEditMode
@script RequireComponent (Camera)
@script AddComponentMenu ("Image Effects/Fisheye")

class Fisheye extends PostEffectsBase {
	public var strengthX : float = 0.05f;
	public var strengthY : float = 0.05f;

	public var fishEyeShader : Shader = null;
	private var fisheyeMaterial : Material = null;	
	
	function OnDisable()
	{
	    if (fisheyeMaterial)
	        DestroyImmediate(fisheyeMaterial);
	}
	function CheckResources () : boolean {	
		CheckSupport (false);
		fisheyeMaterial = CheckShaderAndCreateMaterial(fishEyeShader,fisheyeMaterial);
		
		if(!isSupported)
			ReportAutoDisable ();
		return isSupported;			
	}
	
	function OnRenderImage (source : RenderTexture, destination : RenderTexture) {		
		if(CheckResources()==false) {
			Graphics.Blit (source, destination);
			return;
		}
				
		var oneOverBaseSize : float = 80.0f / 512.0f; // to keep values more like in the old version of fisheye
		
		var ar : float = (source.width * 1.0f) / (source.height * 1.0f);
		
		fisheyeMaterial.SetVector ("intensity", Vector4 (strengthX * ar * oneOverBaseSize, strengthY * oneOverBaseSize, strengthX * ar * oneOverBaseSize, strengthY * oneOverBaseSize));
		Graphics.Blit (source, destination, fisheyeMaterial); 	
	}
}