//namespace UnityEngine.PostProcessing
//{
//    public sealed class GrainComponent : PostProcessingComponentRenderTexture<GrainModel>
//    {
//        static class Uniforms
//        {
//            internal static readonly int _Grain_Params1 = Shader.PropertyToID("_Grain_Params1");
//            internal static readonly int _Grain_Params2 = Shader.PropertyToID("_Grain_Params2");
//            internal static readonly int _GrainTex = Shader.PropertyToID("_GrainTex");
//            internal static readonly int _Phase = Shader.PropertyToID("_Phase");
//        }

//        public override bool active
//        {
//            get
//            {
//                return model.enabled
//                       && model.settings.intensity > 0f
//                       && SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.ARGBHalf)
//                       && !context.interrupted;
//            }
//        }

//        RenderTexture m_GrainLookupRT;

//        public override void OnDisable()
//        {
//            GraphicsUtils.Destroy(m_GrainLookupRT);
//            m_GrainLookupRT = null;
//        }

//        public override void Prepare(Material uberMaterial)
//        {
//            var settings = model.settings;

//            uberMaterial.EnableKeyword("GRAIN");

//            float rndOffsetX;
//            float rndOffsetY;

//#if POSTFX_DEBUG_STATIC_GRAIN
//            // Chosen by a fair dice roll
//            float time = 4f;
//            rndOffsetX = 0f;
//            rndOffsetY = 0f;
//#else
//            float time = Time.realtimeSinceStartup;
//            rndOffsetX = Random.value;
//            rndOffsetY = Random.value;
//#endif

//            // Generate the grain lut for the current frame first
//            if (m_GrainLookupRT == null || !m_GrainLookupRT.IsCreated())
//            {
//                GraphicsUtils.Destroy(m_GrainLookupRT);

//                m_GrainLookupRT = new RenderTexture(192, 192, 0, RenderTextureFormat.ARGBHalf)
//                {
//                    filterMode = FilterMode.Bilinear,
//                    wrapMode = TextureWrapMode.Repeat,
//                    anisoLevel = 0,
//                    name = "Grain Lookup Texture"
//                };

//                m_GrainLookupRT.Create();
//            }

//            var grainMaterial = context.materialFactory.Get("Hidden/Post FX/Grain Generator");
//            grainMaterial.SetFloat(Uniforms._Phase, time / 20f);

//            Graphics.Blit((Texture)null, m_GrainLookupRT, grainMaterial, settings.colored ? 1 : 0);

//            // Send everything to the uber shader
//            uberMaterial.SetTexture(Uniforms._GrainTex, m_GrainLookupRT);
//            uberMaterial.SetVector(Uniforms._Grain_Params1, new Vector2(settings.luminanceContribution, settings.intensity * 20f));
//            uberMaterial.SetVector(Uniforms._Grain_Params2, new Vector4((float)context.width / (float)m_GrainLookupRT.width / settings.size, (float)context.height / (float)m_GrainLookupRT.height / settings.size, rndOffsetX, rndOffsetY));
//        }
//    }
//}