﻿using System;
using UnityEngine;
using UnityEngine.Rendering.PostProcessing;

[Serializable]
[PostProcess(typeof(NeonRenderer), PostProcessEvent.AfterStack, "Snapshot Pro/Neon")]
public class Neon : PostProcessEffectSettings
{
    [Range(0.0f, 1.0f), Tooltip("Saturation values lower than this will be clamped to this.")]
    public FloatParameter saturationFloor = new FloatParameter { value = 1.0f };

    [Range(0.0f, 1.0f), Tooltip("Lightness/value values lower than this will be clamped to this.")]
    public FloatParameter lightnessFloor = new FloatParameter { value = 1.0f };

    [Range(0.0f, 1.0f), Tooltip("Threshold for colour-based edge detection.")]
    public FloatParameter colorSensitivity = new FloatParameter { value = 0.1f };

    [Range(0.0f, 1.0f), Tooltip("Strength of colour-based edges.")]
    public FloatParameter colorStrength = new FloatParameter { value = 1.0f };

    [Range(0.0f, 1.0f), Tooltip("Threshold for depth-based edge detection.")]
    public FloatParameter depthSensitivity = new FloatParameter { value = 0.01f };

    [Range(0.0f, 1.0f), Tooltip("Strength of depth-based edges.")]
    public FloatParameter depthStrength = new FloatParameter { value = 1.0f };

    [Range(0.0f, 1.0f), Tooltip("Threshold for normal-based edge detection.")]
    public FloatParameter normalSensitivity = new FloatParameter { value = 0.1f };

    [Range(0.0f, 1.0f), Tooltip("Strength of normal-based edges.")]
    public FloatParameter normalStrength = new FloatParameter { value = 1.0f };
}

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

        sheet.properties.SetFloat("_ColorSensitivity", settings.colorSensitivity);
        sheet.properties.SetFloat("_ColorStrength", settings.colorStrength);
        sheet.properties.SetFloat("_DepthSensitivity", settings.depthSensitivity);
        sheet.properties.SetFloat("_DepthStrength", settings.depthStrength);
        sheet.properties.SetFloat("_NormalsSensitivity", settings.normalSensitivity);
        sheet.properties.SetFloat("_NormalsStrength", settings.normalStrength);

        sheet.properties.SetFloat("_SaturationFloor", settings.saturationFloor);
        sheet.properties.SetFloat("_LightnessFloor", settings.lightnessFloor);

        context.command.BlitFullscreenTriangle(context.source, context.destination, sheet, 0);
    }
}
