using UnityEngine;
using UnityEngine.Rendering;
using System;

[ExecuteInEditMode, ImageEffectAllowedInSceneView]
public class FXAAEffect : MonoBehaviour {

	const int luminancePass = 0;
	const int fxaaPass = 1;
	// public enum LuminanceMode { Alpha, Green, Calculate }

	// public LuminanceMode luminanceSource;

	[Range(0.0312f, 0.0833f)]
	public float contrastThreshold = 0.0312f;

	[Range(0.063f, 0.333f)]
	public float relativeThreshold = 0.063f;

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

	// [HideInInspector]
	public Shader fxaaShader;

	public bool lowQuality;

	// public bool gammaBlending;

	[NonSerialized]
	Material fxaaMaterial;
    RenderTexture luminanceTex;

	void OnRenderImage (RenderTexture source, RenderTexture destination) {
		if (fxaaMaterial == null) {
			fxaaMaterial = new Material(fxaaShader);
			fxaaMaterial.hideFlags = HideFlags.HideAndDontSave;
		}
		fxaaMaterial.SetFloat("_ContrastThreshold", contrastThreshold);
		fxaaMaterial.SetFloat("_RelativeThreshold", relativeThreshold);
		fxaaMaterial.SetFloat("_SubpixelBlending", subpixelBlending);
        
		if (lowQuality) {
			fxaaMaterial.EnableKeyword("LOW_QUALITY");
		}
		else {
			fxaaMaterial.DisableKeyword("LOW_QUALITY");
		}

		// if (gammaBlending) {
		// 	fxaaMaterial.EnableKeyword("GAMMA_BLENDING");
		// }
		// else {
		// 	fxaaMaterial.DisableKeyword("GAMMA_BLENDING");
		// }

		// if (luminanceSource == LuminanceMode.Calculate) {
		// 	fxaaMaterial.DisableKeyword("LUMINANCE_GREEN");
		// 	luminanceTex = RenderTexture.GetTemporary(
		// 		source.width, source.height, 0, source.format
		// 	);
		// 	Graphics.Blit(source, luminanceTex, fxaaMaterial, luminancePass);
		// 	Graphics.Blit(luminanceTex, destination, fxaaMaterial, fxaaPass);
		// 	RenderTexture.ReleaseTemporary(luminanceTex);
		// }
		// else {
			// if (luminanceSource == LuminanceMode.Green) {
			// 	fxaaMaterial.EnableKeyword("LUMINANCE_GREEN");
			// }
			// else {
			// 	fxaaMaterial.DisableKeyword("LUMINANCE_GREEN");
			// }
			Graphics.Blit(source, destination, fxaaMaterial, fxaaPass);
		// }
	}
}