using UnityEngine;

namespace Es.InkPainter.Effective
{
	public static class GrabArea
	{
		public enum GrabTextureWrapMode
		{
			Clamp = 0,
			Repeat = 1,
			Clip = 2
		}

		private const string GRAB_AREA_MATERIAL = "Es.InkPainter.Effective.GrabArea";

		private const string CLIP = "_ClipTex";

		private const string TARGET = "_TargetTex";

		private const string CLIP_SCALE = "_ClipScale";

		private const string CLIP_UV = "_ClipUV";

		private const string ROTATE = "_Rotate";

		private const string WM_CLAMP = "WRAP_MODE_CLAMP";

		private const string WM_REPEAT = "WRAP_MODE_REPEAT";

		private const string WM_CLIP = "WRAP_MODE_CLIP";

		private const string ALPHA_REPLACE = "ALPHA_REPLACE";

		private const string ALPHA_NOT_REPLACE = "ALPHA_NOT_REPLACE";

		private static Material grabAreaMaterial;

		public static void Clip(Texture clipTexture, float clipScale, Texture grabTargetTexture, Vector2 targetUV, float rotateAngle, GrabTextureWrapMode wrapMode, RenderTexture dst, bool replaceAlpha = true)
		{
			if (grabAreaMaterial == null)
			{
				InitGrabAreaMaterial();
			}
			SetGrabAreaProperty(clipTexture, clipScale, grabTargetTexture, targetUV, rotateAngle, wrapMode, replaceAlpha);
			RenderTexture temporary = RenderTexture.GetTemporary(clipTexture.width, clipTexture.height, 0);
			Graphics.Blit(clipTexture, temporary, grabAreaMaterial);
			Graphics.Blit(temporary, dst);
			RenderTexture.ReleaseTemporary(temporary);
		}

		private static void InitGrabAreaMaterial()
		{
			grabAreaMaterial = new Material(Resources.Load<Material>("Es.InkPainter.Effective.GrabArea"));
		}

		private static void SetGrabAreaProperty(Texture clip, float clipScale, Texture grabTarget, Vector2 targetUV, float rotateAngle, GrabTextureWrapMode wrapMpde, bool replaceAlpha)
		{
			grabAreaMaterial.SetTexture("_ClipTex", clip);
			grabAreaMaterial.SetTexture("_TargetTex", grabTarget);
			grabAreaMaterial.SetFloat("_ClipScale", clipScale);
			grabAreaMaterial.SetFloat("_Rotate", rotateAngle);
			grabAreaMaterial.SetVector("_ClipUV", targetUV);
			string[] shaderKeywords = grabAreaMaterial.shaderKeywords;
			foreach (string keyword in shaderKeywords)
			{
				grabAreaMaterial.DisableKeyword(keyword);
			}
			switch (wrapMpde)
			{
			case GrabTextureWrapMode.Clamp:
				grabAreaMaterial.EnableKeyword("WRAP_MODE_CLAMP");
				break;
			case GrabTextureWrapMode.Repeat:
				grabAreaMaterial.EnableKeyword("WRAP_MODE_REPEAT");
				break;
			case GrabTextureWrapMode.Clip:
				grabAreaMaterial.EnableKeyword("WRAP_MODE_CLIP");
				break;
			}
			if (replaceAlpha)
			{
				grabAreaMaterial.EnableKeyword("ALPHA_REPLACE");
			}
			else
			{
				grabAreaMaterial.EnableKeyword("ALPHA_NOT_REPLACE");
			}
		}
	}
}