FSRTestPPV2/Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2Upscaler_2PassCS.cs

using System.Runtime.InteropServices;

namespace UnityEngine.Rendering.PostProcessing
{
    internal class SGSR2Upscaler_2PassCS: SGSR2Upscaler
    {
        public override void Render(PostProcessRenderContext context, Upscaling config)
        {
            var cmd = context.command;
            cmd.BeginSample("SGSR2 2-Pass CS");
            
            ref var parms = ref _paramsBuffer.Value;
            parms.renderSize = config.GetScaledRenderSize(context.camera);
            parms.displaySize = config.UpscaleSize;
            parms.renderSizeRcp = new Vector2(1.0f / parms.renderSize.x, 1.0f / parms.renderSize.y);
            parms.displaySizeRcp = new Vector2(1.0f / parms.displaySize.x, 1.0f / parms.displaySize.y);
            parms.jitterOffset = config.JitterOffset;
            parms.clipToPrevClip = Matrix4x4.identity; // TODO: clipToPrevClip => (previous_view_proj * inv_vp)
            parms.preExposure = config.preExposure;
            parms.cameraFovAngleHor = Mathf.Tan(context.camera.fieldOfView * Mathf.Deg2Rad * 0.5f) * (float)parms.renderSize.x / parms.renderSize.y;
            parms.cameraNear = context.camera.nearClipPlane;
            parms.minLerpContribution = 0f;
            parms.bSameCamera = 0u;
            parms.reset = config.Reset ? 1u : 0u;
            _paramsBuffer.UpdateBufferData(cmd);

            if (_frameCount == 0 || config.Reset)
            {
                cmd.SetRenderTarget(_lumaHistory[0]);
                cmd.ClearRenderTarget(false, true, Color.clear);
                cmd.SetRenderTarget(_lumaHistory[1]);
                cmd.ClearRenderTarget(false, true, Color.clear);
                cmd.SetRenderTarget(_upscaleHistory[0]);
                cmd.ClearRenderTarget(false, true, Color.clear);
                cmd.SetRenderTarget(_upscaleHistory[1]);
                cmd.ClearRenderTarget(false, true, Color.clear);
            }

            Convert(cmd, context, config);
            Upscale(cmd, context);
            
            cmd.EndSample("SGSR2 2-Pass CS");
            _frameCount++;
        }

        private void Convert(CommandBuffer cmd, PostProcessRenderContext context, Upscaling config)
        {
            var shader = context.resources.computeShaders.sgsr2Upscaler.twoPassCompute.convert;
            int kernelIndex = shader.FindKernel("CS");
            
            cmd.SetComputeConstantBufferParam(shader, "Params", _paramsBuffer, 0, Marshal.SizeOf<SGSR2.Params>());
            cmd.SetComputeTextureParam(shader, kernelIndex, "InputColor", context.source);
            cmd.SetComputeTextureParam(shader, kernelIndex, "InputDepth", BuiltinRenderTextureType.CameraTarget, 0, RenderTextureSubElement.Depth);
            cmd.SetComputeTextureParam(shader, kernelIndex, "InputVelocity", BuiltinRenderTextureType.MotionVectors);
            cmd.SetComputeTextureParam(shader, kernelIndex, "MotionDepthClipAlphaBuffer", _motionDepthClipAlpha);
            cmd.SetComputeTextureParam(shader, kernelIndex, "YCoCgColor", _colorLuma);
            
            const int threadGroupWorkRegionDim = 8;
            int dispatchSrcX = (_paramsBuffer.Value.renderSize.x + (threadGroupWorkRegionDim - 1)) / threadGroupWorkRegionDim;
            int dispatchSrcY = (_paramsBuffer.Value.renderSize.y + (threadGroupWorkRegionDim - 1)) / threadGroupWorkRegionDim;
            cmd.DispatchCompute(shader, kernelIndex, dispatchSrcX, dispatchSrcY, 1);
        }

        private void Upscale(CommandBuffer cmd, PostProcessRenderContext context)
        {
            var shader = context.resources.computeShaders.sgsr2Upscaler.twoPassCompute.upscale;
            int kernelIndex = shader.FindKernel("CS");
            uint frameIndex = _frameCount % 2;
            
            cmd.SetComputeConstantBufferParam(shader, "Params", _paramsBuffer, 0, Marshal.SizeOf<SGSR2.Params>());
            cmd.SetComputeTextureParam(shader, kernelIndex, "PrevHistoryOutput", _upscaleHistory[frameIndex ^ 1]);
            cmd.SetComputeTextureParam(shader, kernelIndex, "MotionDepthClipAlphaBuffer", _motionDepthClipAlpha);
            cmd.SetComputeTextureParam(shader, kernelIndex, "YCoCgColor", _colorLuma);
            cmd.SetComputeTextureParam(shader, kernelIndex, "SceneColorOutput", context.destination);
            cmd.SetComputeTextureParam(shader, kernelIndex, "HistoryOutput", _upscaleHistory[frameIndex]);
            
            const int threadGroupWorkRegionDim = 8;
            int dispatchDstX = (_paramsBuffer.Value.displaySize.x + (threadGroupWorkRegionDim - 1)) / threadGroupWorkRegionDim;
            int dispatchDstY = (_paramsBuffer.Value.displaySize.y + (threadGroupWorkRegionDim - 1)) / threadGroupWorkRegionDim;
            cmd.DispatchCompute(shader, kernelIndex, dispatchDstX, dispatchDstY, 1);
        }
    }
}