#pragma strict

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

class Crease extends PostEffectsBase {
	public var intensity : float = 0.5;
	public var softness : int = 1;
	public var spread : float = 1.0;
	
	public var blurShader : Shader;
	private var blurMaterial : Material = null;	
	
	public var depthFetchShader : Shader;
	private var depthFetchMaterial : Material = null;
	
	public var creaseApplyShader : Shader;
	private var creaseApplyMaterial : Material = null;	
	
	function OnDisable()
	{
		if (blurMaterial)
		    DestroyImmediate(blurMaterial);
		if (depthFetchMaterial)
		    DestroyImmediate(depthFetchMaterial);
		if (creaseApplyMaterial)
		    DestroyImmediate(creaseApplyMaterial);
	}
	function CheckResources () : boolean {	
		CheckSupport (true);
		
		blurMaterial = CheckShaderAndCreateMaterial (blurShader, blurMaterial);
		depthFetchMaterial = CheckShaderAndCreateMaterial (depthFetchShader, depthFetchMaterial);
		creaseApplyMaterial = CheckShaderAndCreateMaterial (creaseApplyShader, creaseApplyMaterial);
		
		if(!isSupported)
			ReportAutoDisable ();
		return isSupported;			
	}
	
	function OnRenderImage (source : RenderTexture, destination : RenderTexture) {	
		if(CheckResources()==false) {
			Graphics.Blit (source, destination);
			return;
		}
		
		var widthOverHeight : float = (1.0f * source.width) / (1.0f * source.height);
		var oneOverBaseSize : float = 1.0f / 512.0f;		

		var hrTex : RenderTexture = RenderTexture.GetTemporary (source.width, source.height, 0); 
		var lrTex1 : RenderTexture = RenderTexture.GetTemporary (source.width / 2, source.height / 2, 0); 
		var lrTex2 : RenderTexture = RenderTexture.GetTemporary (source.width / 2, source.height / 2, 0); 
		
		Graphics.Blit (source,hrTex, depthFetchMaterial);
		Graphics.Blit (hrTex, lrTex1);
		
		for(var i : int = 0; i < softness; i++) {
			blurMaterial.SetVector ("offsets", Vector4 (0.0, spread * oneOverBaseSize, 0.0, 0.0));
			Graphics.Blit (lrTex1, lrTex2, blurMaterial);
			blurMaterial.SetVector ("offsets", Vector4 (spread * oneOverBaseSize / widthOverHeight,  0.0, 0.0, 0.0));		
			Graphics.Blit (lrTex2, lrTex1, blurMaterial);
		}
		
		creaseApplyMaterial.SetTexture ("_HrDepthTex", hrTex);
		creaseApplyMaterial.SetTexture ("_LrDepthTex", lrTex1);
		creaseApplyMaterial.SetFloat ("intensity", intensity);
		Graphics.Blit (source,destination, creaseApplyMaterial);	

		RenderTexture.ReleaseTemporary (hrTex);
		RenderTexture.ReleaseTemporary (lrTex1);
		RenderTexture.ReleaseTemporary (lrTex2);
	}	
}