using UnityEngine;

namespace UnityStandardAssets.ImageEffects
{
	[RequireComponent(typeof(Camera))]
	[AddComponentMenu("Image Effects/Camera/Tilt Shift (Lens Blur)")]
	internal class TiltShift : PostEffectsBase
	{
		public enum TiltShiftMode
		{
			TiltShiftMode = 0,
			IrisMode = 1
		}

		public enum TiltShiftQuality
		{
			Preview = 0,
			Normal = 1,
			High = 2
		}

		public TiltShiftMode mode;

		public TiltShiftQuality quality = TiltShiftQuality.Normal;

		[Range(0f, 15f)]
		public float blurArea = 1f;

		[Range(0f, 25f)]
		public float maxBlurSize = 5f;

		[Range(0f, 1f)]
		public int downsample;

		public Shader tiltShiftShader;

		private Material tiltShiftMaterial;

		public override bool CheckResources()
		{
			CheckSupport(true);
			tiltShiftMaterial = CheckShaderAndCreateMaterial(tiltShiftShader, tiltShiftMaterial);
			if (!isSupported)
			{
				ReportAutoDisable();
			}
			return isSupported;
		}

		private void OnRenderImage(RenderTexture source, RenderTexture destination)
		{
			if (!CheckResources())
			{
				Graphics.Blit(source, destination);
				return;
			}
			tiltShiftMaterial.SetFloat("_BlurSize", (!(maxBlurSize < 0f)) ? maxBlurSize : 0f);
			tiltShiftMaterial.SetFloat("_BlurArea", blurArea);
			source.filterMode = FilterMode.Bilinear;
			RenderTexture renderTexture = destination;
			if ((float)downsample > 0f)
			{
				renderTexture = RenderTexture.GetTemporary(source.width >> downsample, source.height >> downsample, 0, source.format);
				renderTexture.filterMode = FilterMode.Bilinear;
			}
			int num = (int)quality;
			num *= 2;
			Graphics.Blit(source, renderTexture, tiltShiftMaterial, (mode != TiltShiftMode.TiltShiftMode) ? (num + 1) : num);
			if (downsample > 0)
			{
				tiltShiftMaterial.SetTexture("_Blurred", renderTexture);
				Graphics.Blit(source, destination, tiltShiftMaterial, 6);
			}
			if (renderTexture != destination)
			{
				RenderTexture.ReleaseTemporary(renderTexture);
			}
		}
	}
}