using UnityEngine;

namespace UnityStandardAssets.ImageEffects
{
	[ExecuteInEditMode]
	[RequireComponent(typeof(Camera))]
	[AddComponentMenu("Image Effects/Edge Detection/Crease Shading")]
	public class CreaseShading : PostEffectsBase
	{
		public float intensity = 0.5f;

		public int softness = 1;

		public float spread = 1f;

		public Shader blurShader;

		private Material blurMaterial;

		public Shader depthFetchShader;

		private Material depthFetchMaterial;

		public Shader creaseApplyShader;

		private Material creaseApplyMaterial;

		public override bool CheckResources()
		{
			CheckSupport(true);
			blurMaterial = CheckShaderAndCreateMaterial(blurShader, blurMaterial);
			depthFetchMaterial = CheckShaderAndCreateMaterial(depthFetchShader, depthFetchMaterial);
			creaseApplyMaterial = CheckShaderAndCreateMaterial(creaseApplyShader, creaseApplyMaterial);
			if (!isSupported)
			{
				ReportAutoDisable();
			}
			return isSupported;
		}

		private void OnRenderImage(RenderTexture source, RenderTexture destination)
		{
			if (!CheckResources())
			{
				Graphics.Blit(source, destination);
				return;
			}
			int width = source.width;
			int height = source.height;
			float num = 1f * (float)width / (1f * (float)height);
			float num2 = 0.001953125f;
			RenderTexture temporary = RenderTexture.GetTemporary(width, height, 0);
			RenderTexture renderTexture = RenderTexture.GetTemporary(width / 2, height / 2, 0);
			Graphics.Blit(source, temporary, depthFetchMaterial);
			Graphics.Blit(temporary, renderTexture);
			for (int i = 0; i < softness; i++)
			{
				RenderTexture temporary2 = RenderTexture.GetTemporary(width / 2, height / 2, 0);
				blurMaterial.SetVector("offsets", new Vector4(0f, spread * num2, 0f, 0f));
				Graphics.Blit(renderTexture, temporary2, blurMaterial);
				RenderTexture.ReleaseTemporary(renderTexture);
				renderTexture = temporary2;
				temporary2 = RenderTexture.GetTemporary(width / 2, height / 2, 0);
				blurMaterial.SetVector("offsets", new Vector4(spread * num2 / num, 0f, 0f, 0f));
				Graphics.Blit(renderTexture, temporary2, blurMaterial);
				RenderTexture.ReleaseTemporary(renderTexture);
				renderTexture = temporary2;
			}
			creaseApplyMaterial.SetTexture("_HrDepthTex", temporary);
			creaseApplyMaterial.SetTexture("_LrDepthTex", renderTexture);
			creaseApplyMaterial.SetFloat("intensity", intensity);
			Graphics.Blit(source, destination, creaseApplyMaterial);
			RenderTexture.ReleaseTemporary(temporary);
			RenderTexture.ReleaseTemporary(renderTexture);
		}
	}
}