();CommandBuffer cmd = CommandBufferPool.Get();//使用ProfilingScope 才能在FrameDebugger中看到using (new ProfilingScope(cmd, new ProfilingSampler("Custom Post Process Effect"))){Texture ssaoTex = Shader.GetGlobalTexture(ScreenSpaceOcclusionTexture);m_compositeMaterial.SetTexture("_SSAOTexture", ssaoTex);//Shader.SetGlobalTexture("_SSAOTexture", ssaoTex);SetupBloom(cmd, m_CameraColorTarget);m_compositeMaterial.SetFloat("_Cutoff", m_BloomEffect.dotsCutoff.value);m_compositeMaterial.SetFloat("_Density", m_BloomEffect.dotsDensity.value);m_compositeMaterial.SetVector("_Direction", m_BloomEffect.scrollDirection.value);m_compositeMaterial.SetFloat("_LineWidth", m_BloomEffect.linesWidth.value);m_compositeMaterial.SetFloat("_LineIntensity", m_BloomEffect.linesIntensity.value);m_compositeMaterial.SetColor("_LineColor", m_BloomEffect.linesColor.value);m_compositeMaterial.SetFloat("_LineAngle", m_BloomEffect.linesAngle.value);Blitter.BlitCameraTexture(cmd, m_CameraColorTarget, m_CameraColorTarget, m_compositeMaterial, 0);}context.ExecuteCommandBuffer(cmd);cmd.Clear();CommandBufferPool.Release(cmd);}private void SetupBloom(CommandBuffer cmd, RTHandle source){// 初始大小减半 降采样int downres = 1;int tw = m_Descriptor.width >> downres;int th = m_Descriptor.height >> downres;//Determine the iteration count based on the size of the pyramidint maxSize = Mathf.Max(tw, th);int iterations = Mathf.FloorToInt(Mathf.Log(maxSize,2f) - 1);int mipCount = Mathf.Clamp(iterations,1, m_BloomEffect.maxIterations.value);// Pre-filtering parametersfloat clamp = m_BloomEffect.clamp.value;float threshold = Mathf.GammaToLinearSpace(m_BloomEffect.threshold.value);float thresholdKnee = threshold * 0.5f;// Hardcoded soft knee// Material setupfloat scatter = Mathf.Lerp(0.05f,0.95f,m_BloomEffect.scatter.value);var bloomMaterial = m_bloomMaterial;bloomMaterial.SetVector("_Params",new Vector4(scatter,clamp,threshold,thresholdKnee));//Prefiltervar desc = GetCompatibleDescriptor(tw,th,hdrFormat);for (int i = 0; i < mipCount; i++){RenderingUtils.ReAllocateIfNeeded(ref m_BloomMipUp[i],desc,FilterMode.Bilinear,TextureWrapMode.Clamp,name: m_BloomMipUp[i].name);RenderingUtils.ReAllocateIfNeeded(ref m_BloomMipDown[i], desc, FilterMode.Bilinear, TextureWrapMode.Clamp,name: m_BloomMipDown[i].name);desc.width = Mathf.Max(1, desc.width >> 1);desc.height = Mathf.Max(i, desc.height >> i);}Blitter.BlitCameraTexture(cmd, source, m_BloomMipDown[0], RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store, bloomMaterial, 0);//Downsamplevar lastdown = m_BloomMipDown[0];for (int i = 0; i < mipCount - 1; i++){//第一个Pass是 2x 降采样 + 9tap高斯模糊//第二个Pass是 使用5tap过滤的9tap高斯模糊 + 双线性过滤 Blitter.BlitCameraTexture(cmd, lastdown, m_BloomMipUp[i], RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store, bloomMaterial, 1);Blitter.BlitCameraTexture(cmd, m_BloomMipUp[i], m_BloomMipDown[i], RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store, bloomMaterial, 2);lastdown = m_BloomMipDown[i];}// Upsamplefor (int i = mipCount - 2; i >= 0; i--){var lowMip = (i == mipCount - 2)? m_BloomMipDown[i + 1] : m_BloomMipUp[i + 1];var highMip = m_BloomMipDown[i];var dst = m_BloomMipUp[i];cmd.SetGlobalTexture("_SourceTexLowMip", lowMip);Blitter.BlitCameraTexture(cmd, highMip, dst, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store, bloomMaterial, 3);}m_compositeMaterial.SetTexture("_Bloom_Texture", m_BloomMipUp[0]);m_compositeMaterial.SetFloat("_BloomIntensity", m_BloomEffect.intensity.value);cmd.SetGlobalFloat("_BloomIntensity", m_BloomEffect.intensity.value);}private RenderTextureDescriptor GetCompatibleDescriptor(){return GetCompatibleDescriptor(m_Descriptor.width, m_Descriptor.height, m_Descriptor.graphicsFormat);}private RenderTextureDescriptor GetCompatibleDescriptor(int tw, int th, GraphicsFormat graphicsFormat, DepthBits depthBufferBits = DepthBits.None){return GetCompatibleDescriptor(m_Descriptor, tw, th, graphicsFormat, depthBufferBits);}internal static RenderTextureDescriptor GetCompatibleDescriptor(RenderTextureDescriptor desc, int tw, int th, GraphicsFormat format, DepthBits depthBufferBits = DepthBits.None){desc.depthBufferBits = (int)depthBufferBits;desc.width = tw;desc.height = th;desc.graphicsFormat = format;desc.msaaSamples = 1;return desc;}}
