using UnityEngine;

namespace UnityStandardAssets.ImageEffects
{
	[ExecuteInEditMode]
	[RequireComponent(typeof(Camera))]
	[AddComponentMenu("Image Effects/Edge Detection/Edge Detection")]
	public class EdgeDetection : PostEffectsBase
	{
		public enum EdgeDetectMode
		{
			TriangleDepthNormals = 0,
			RobertsCrossDepthNormals = 1,
			SobelDepth = 2,
			SobelDepthThin = 3,
			TriangleLuminance = 4
		}

		public EdgeDetectMode mode = EdgeDetectMode.SobelDepthThin;

		public float sensitivityDepth = 1f;

		public float sensitivityNormals = 1f;

		public float lumThreshold = 0.2f;

		public float edgeExp = 1f;

		public float sampleDist = 1f;

		public float edgesOnly;

		public Color edgesOnlyBgColor = Color.white;

		public Shader edgeDetectShader;

		private Material edgeDetectMaterial;

		private EdgeDetectMode oldMode = EdgeDetectMode.SobelDepthThin;

		public override bool CheckResources()
		{
			CheckSupport(true);
			edgeDetectMaterial = CheckShaderAndCreateMaterial(edgeDetectShader, edgeDetectMaterial);
			if (mode != oldMode)
			{
				SetCameraFlag();
			}
			oldMode = mode;
			if (!isSupported)
			{
				ReportAutoDisable();
			}
			return isSupported;
		}

		private new void Start()
		{
			oldMode = mode;
		}

		private void SetCameraFlag()
		{
			if (mode == EdgeDetectMode.SobelDepth || mode == EdgeDetectMode.SobelDepthThin)
			{
				GetComponent<Camera>().depthTextureMode |= DepthTextureMode.Depth;
			}
			else if (mode == EdgeDetectMode.TriangleDepthNormals || mode == EdgeDetectMode.RobertsCrossDepthNormals)
			{
				GetComponent<Camera>().depthTextureMode |= DepthTextureMode.DepthNormals;
			}
		}

		private void OnEnable()
		{
			SetCameraFlag();
		}

		[ImageEffectOpaque]
		private void OnRenderImage(RenderTexture source, RenderTexture destination)
		{
			if (!CheckResources())
			{
				Graphics.Blit(source, destination);
				return;
			}
			Vector2 vector = new Vector2(sensitivityDepth, sensitivityNormals);
			edgeDetectMaterial.SetVector("_Sensitivity", new Vector4(vector.x, vector.y, 1f, vector.y));
			edgeDetectMaterial.SetFloat("_BgFade", edgesOnly);
			edgeDetectMaterial.SetFloat("_SampleDistance", sampleDist);
			edgeDetectMaterial.SetVector("_BgColor", edgesOnlyBgColor);
			edgeDetectMaterial.SetFloat("_Exponent", edgeExp);
			edgeDetectMaterial.SetFloat("_Threshold", lumThreshold);
			Graphics.Blit(source, destination, edgeDetectMaterial, (int)mode);
		}
	}
}