Whats the correct way of declaring and using TextureParameter in a Custom PostProcessing Effect?

Hey guys. I´m creating a Custom Post Processing Effect that requires an extra texture in order to work but I´m having weird problems when trying to use the effect in the editor.

First , I get lots of null value errors pointing to that texture parameter , sometimes they go away once I select the texture I want to use in the PostProcessing profile editor but other times the error just stays there.

However , the worst problem I´m having is that the config of the effect randomly gets deleted from the profiles. This often happens when I change the scene but It can also happen when I do as little as clicking the another object in order to inspect it.

I don´t know if Im declaring the TextureParameter wrong or I´m missing something , so I´m leaving the code here for you to inspect it.

Code (CSharp):

1. [Serializable]
2. [PostProcess(typeof(TextureOverlayRenderer), PostProcessEvent.BeforeStack, "Custom/TextureOverlay")]
3. public sealed class PostProcessingEffect_TextureOverlay : PostProcessEffectSettings
4. {
5.     [Tooltip("Texture To Apply")]
6.     public TextureParameter overlayTexture = new TextureParameter();
7.     [Range(0f, 1f), Tooltip("Effect Opacity")]
8.     public FloatParameter opacity = new FloatParameter { value = 0.5f };
9.     [Range(0f, 1f), Tooltip("Original Pixel Blending")]
10.     public FloatParameter blending = new FloatParameter { value = 0.0f };
11.     [Tooltip("Texture Rows ")]
12.     public IntParameter rows = new IntParameter { value = 1 };
13.     [Tooltip("Texture Colums ")]
14.     public IntParameter colums = new IntParameter { value = 1 };
15.     [Range(0.0f, 60.0f), Tooltip("Animation Speed ")]
16.     public FloatParameter AnimationSpeed = new FloatParameter { value = 1.0f };
17.     [Tooltip("Uses Negate Effect Texture ")]
18.     public BoolParameter usesNegateTexture = new BoolParameter { value = false };
19.     [Tooltip("Negate Effect Texture")]
20.     public TextureParameter negateEffectTexture = new TextureParameter();
21.     [Range(0f, 1f), Tooltip("Negate Texture Alpha Cutout")]
22.     public FloatParameter alphaCutout = new FloatParameter { value = 0.0f };
23.     [Range(0f, 1f), Tooltip("Negate Texture Blend")]
24.     public FloatParameter negateBlend = new FloatParameter { value = 0.0f };
25.  
26.     public override bool IsEnabledAndSupported(PostProcessRenderContext context)
27.     {
28.         return enabled.value && (overlayTexture != null) && (opacity > 0) &&
29.             (
30.             (usesNegateTexture == true && negateEffectTexture != null)
31.             ||
32.             (usesNegateTexture==false && negateEffectTexture==null)
33.             );
34.     }
35. }

Hope you can help me

 

// Reference (UnityPackage: Post Processing Texture Overlay)
public sealed class PostMask : PostProcessEffectSettings
{
public TextureParameter maskTex = new TextureParameter { value = null };
}

public sealed class PostMaskRenderer : PostProcessEffectRenderer<PostMask>
{
public override void Render(PostProcessRenderContext context)
{
var sheet = context.propertySheets.Get(Shader.Find("Hidden/tys/PostMask"));

var imageTexture = settings.maskTex.value == null? RuntimeUtilities.whiteTexture: settings.maskTex.value;
sheet.properties.SetTexture("_MaskTex", imageTexture);
context.command.BlitFullscreenTriangle(context.source, context.destination, sheet, 0);
}
}