//using UnityEngine.Rendering;

//namespace UnityEngine.PostProcessing
//{
//    public sealed class TaaComponent : PostProcessingComponentRenderTexture<AntialiasingModel>
//    {
//        static class Uniforms
//        {
//            internal static int _Jitter               = Shader.PropertyToID("_Jitter");
//            internal static int _SharpenParameters    = Shader.PropertyToID("_SharpenParameters");
//            internal static int _FinalBlendParameters = Shader.PropertyToID("_FinalBlendParameters");
//            internal static int _HistoryTex           = Shader.PropertyToID("_HistoryTex");
//            internal static int _MainTex              = Shader.PropertyToID("_MainTex");
//        }

//        const string k_ShaderString = "Hidden/Post FX/Temporal Anti-aliasing";
//        const int k_SampleCount = 8;

//        readonly RenderBuffer[] m_MRT = new RenderBuffer[2];

//        int m_SampleIndex;
//        bool m_ResetHistory;

//        RenderTexture m_HistoryTexture;

//        public override bool active
//        {
//            get
//            {
//                return model.enabled
//                       && model.settings.method == AntialiasingModel.Method.Taa
//                       && SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.ARGBHalf)
//                       && SystemInfo.supportsMotionVectors
//                       && !context.interrupted;
//            }
//        }

//        public override DepthTextureMode GetCameraFlags()
//        {
//            return DepthTextureMode.Depth | DepthTextureMode.MotionVectors;
//        }

//        public void ResetHistory()
//        {
//            m_ResetHistory = true;
//        }

//        public void SetProjectionMatrix()
//        {
//            var settings = model.settings.taaSettings;

//            var jitter = GenerateRandomOffset();
//            jitter *= settings.jitterSpread;

//            context.camera.nonJitteredProjectionMatrix = context.camera.projectionMatrix;
//            context.camera.projectionMatrix = context.camera.orthographic
//                ? GetOrthographicProjectionMatrix(jitter)
//                : GetPerspectiveProjectionMatrix(jitter);

//#if UNITY_5_5_OR_NEWER
//            context.camera.useJitteredProjectionMatrixForTransparentRendering = false;
//#endif

//            jitter.x /= context.width;
//            jitter.y /= context.height;

//            var material = context.materialFactory.Get(k_ShaderString);
//            material.SetVector(Uniforms._Jitter, jitter);
//        }

//        public void Render(RenderTexture source, RenderTexture destination)
//        {
//            var material = context.materialFactory.Get(k_ShaderString);
//            material.shaderKeywords = null;

//            var settings = model.settings.taaSettings;

//            if (m_ResetHistory || m_HistoryTexture == null || m_HistoryTexture.width != source.width || m_HistoryTexture.height != source.height)
//            {
//                if (m_HistoryTexture)
//                    RenderTexture.ReleaseTemporary(m_HistoryTexture);

//                m_HistoryTexture = RenderTexture.GetTemporary(source.width, source.height, 0, source.format);
//                m_HistoryTexture.name = "TAA History";

//                Graphics.Blit(source, m_HistoryTexture, material, 2);
//            }

//            const float kMotionAmplification = 100f * 60f;
//            material.SetVector(Uniforms._SharpenParameters, new Vector4(settings.sharpen, 0f, 0f, 0f));
//            material.SetVector(Uniforms._FinalBlendParameters, new Vector4(settings.stationaryBlending, settings.motionBlending, kMotionAmplification, 0f));
//            material.SetTexture(Uniforms._MainTex, source);
//            material.SetTexture(Uniforms._HistoryTex, m_HistoryTexture);

//            var tempHistory = RenderTexture.GetTemporary(source.width, source.height, 0, source.format);
//            tempHistory.name = "TAA History";

//            m_MRT[0] = destination.colorBuffer;
//            m_MRT[1] = tempHistory.colorBuffer;

//            Graphics.SetRenderTarget(m_MRT, source.depthBuffer);
//            GraphicsUtils.Blit(material, context.camera.orthographic ? 1 : 0);

//            RenderTexture.ReleaseTemporary(m_HistoryTexture);
//            m_HistoryTexture = tempHistory;

//            m_ResetHistory = false;
//        }

//        float GetHaltonValue(int index, int radix)
//        {
//            float result = 0f;
//            float fraction = 1f / (float)radix;

//            while (index > 0)
//            {
//                result += (float)(index % radix) * fraction;

//                index /= radix;
//                fraction /= (float)radix;
//            }

//            return result;
//        }

//        Vector2 GenerateRandomOffset()
//        {
//            var offset = new Vector2(
//                    GetHaltonValue(m_SampleIndex & 1023, 2),
//                    GetHaltonValue(m_SampleIndex & 1023, 3));

//            if (++m_SampleIndex >= k_SampleCount)
//                m_SampleIndex = 0;

//            return offset;
//        }

//        // Adapted heavily from PlayDead's TAA code
//        // https://github.com/playdeadgames/temporal/blob/master/Assets/Scripts/Extensions.cs
//        Matrix4x4 GetPerspectiveProjectionMatrix(Vector2 offset)
//        {
//            float vertical = Mathf.Tan(0.5f * Mathf.Deg2Rad * context.camera.fieldOfView);
//            float horizontal = vertical * context.camera.aspect;

//            offset.x *= horizontal / (0.5f * context.width);
//            offset.y *= vertical / (0.5f * context.height);

//            float left = (offset.x - horizontal) * context.camera.nearClipPlane;
//            float right = (offset.x + horizontal) * context.camera.nearClipPlane;
//            float top = (offset.y + vertical) * context.camera.nearClipPlane;
//            float bottom = (offset.y - vertical) * context.camera.nearClipPlane;

//            var matrix = new Matrix4x4();

//            matrix[0, 0] = (2f * context.camera.nearClipPlane) / (right - left);
//            matrix[0, 1] = 0f;
//            matrix[0, 2] = (right + left) / (right - left);
//            matrix[0, 3] = 0f;

//            matrix[1, 0] = 0f;
//            matrix[1, 1] = (2f * context.camera.nearClipPlane) / (top - bottom);
//            matrix[1, 2] = (top + bottom) / (top - bottom);
//            matrix[1, 3] = 0f;

//            matrix[2, 0] = 0f;
//            matrix[2, 1] = 0f;
//            matrix[2, 2] = -(context.camera.farClipPlane + context.camera.nearClipPlane) / (context.camera.farClipPlane - context.camera.nearClipPlane);
//            matrix[2, 3] = -(2f * context.camera.farClipPlane * context.camera.nearClipPlane) / (context.camera.farClipPlane - context.camera.nearClipPlane);

//            matrix[3, 0] = 0f;
//            matrix[3, 1] = 0f;
//            matrix[3, 2] = -1f;
//            matrix[3, 3] = 0f;

//            return matrix;
//        }

//        Matrix4x4 GetOrthographicProjectionMatrix(Vector2 offset)
//        {
//            float vertical = context.camera.orthographicSize;
//            float horizontal = vertical * context.camera.aspect;

//            offset.x *= horizontal / (0.5f * context.width);
//            offset.y *= vertical / (0.5f * context.height);

//            float left = offset.x - horizontal;
//            float right = offset.x + horizontal;
//            float top = offset.y + vertical;
//            float bottom = offset.y - vertical;

//            return Matrix4x4.Ortho(left, right, bottom, top, context.camera.nearClipPlane, context.camera.farClipPlane);
//        }

//        public override void OnDisable()
//        {
//            if (m_HistoryTexture != null)
//                RenderTexture.ReleaseTemporary(m_HistoryTexture);

//            m_HistoryTexture = null;
//            m_SampleIndex = 0;
//        }
//    }
//}