using UnityEngine;

namespace Es.InkPainter.Effective
{
	public static class TextureMorphing
	{
		private const string TEXTURE_MORPHING_MATERIAL = "Es.InkPainter.Effective.TextureMorphing";

		private const string LERP_COEFFICIENT = "_LerpCoef";

		private const string SRC_TEX = "_SrcTex";

		private const string DST_TEX = "_DstTex";

		private static Material morphingMaterial;

		public static void Lerp(Texture src, RenderTexture dst, float lerpCoef)
		{
			if (morphingMaterial == null)
			{
				InitMorphingMaterial();
			}
			SetMorphingProperty(src, dst, lerpCoef);
			RenderTexture temporary = RenderTexture.GetTemporary(src.width, src.height);
			Graphics.Blit(src, temporary, morphingMaterial);
			Graphics.Blit(temporary, dst);
			RenderTexture.ReleaseTemporary(temporary);
		}

		private static void InitMorphingMaterial()
		{
			morphingMaterial = new Material(Resources.Load<Material>("Es.InkPainter.Effective.TextureMorphing"));
		}

		private static void SetMorphingProperty(Texture src, RenderTexture dst, float lerpCoef)
		{
			morphingMaterial.SetTexture(Shader.PropertyToID("_SrcTex"), src);
			morphingMaterial.SetTexture(Shader.PropertyToID("_DstTex"), dst);
			morphingMaterial.SetFloat(Shader.PropertyToID("_LerpCoef"), lerpCoef);
		}
	}
}