void PushDownsampleCommands(CommandBuffer cmd, Camera camera, RenderTargetIdentifier?depthMap)
{
RenderTargetIdentifier depthMapId;
bool needDepthMapRelease = false;
if (depthMap != null)
{
depthMapId = depthMap.Value;
}
else
{
// Make a copy of the depth texture, or reuse the resolved depth
// buffer (it's only available in some specific situations).
if (!RuntimeUtilities.IsResolvedDepthAvailable(camera))
{
Alloc(cmd, ShaderIDs.DepthCopy, MipLevel.Original, RenderTextureFormat.RFloat, false);
depthMapId = new RenderTargetIdentifier(ShaderIDs.DepthCopy);
cmd.BlitFullscreenTriangle(BuiltinRenderTextureType.None, depthMapId, m_PropertySheet, (int)Pass.DepthCopy);
needDepthMapRelease = true;
}
else
{
depthMapId = BuiltinRenderTextureType.ResolvedDepth;
}
}
// 1st downsampling pass.
var cs = m_Resources.computeShaders.multiScaleAODownsample1;
int kernel = cs.FindKernel("main");
cmd.SetComputeTextureParam(cs, kernel, "LinearZ", ShaderIDs.LinearDepth);
cmd.SetComputeTextureParam(cs, kernel, "DS2x", ShaderIDs.LowDepth1);
cmd.SetComputeTextureParam(cs, kernel, "DS4x", ShaderIDs.LowDepth2);
cmd.SetComputeTextureParam(cs, kernel, "DS2xAtlas", ShaderIDs.TiledDepth1);
cmd.SetComputeTextureParam(cs, kernel, "DS4xAtlas", ShaderIDs.TiledDepth2);
cmd.SetComputeVectorParam(cs, "ZBufferParams", CalculateZBufferParams(camera));
cmd.SetComputeTextureParam(cs, kernel, "Depth", depthMapId);
cmd.DispatchCompute(cs, kernel, m_Widths[(int)MipLevel.L4], m_Heights[(int)MipLevel.L4], 1);
if (needDepthMapRelease)
{
Release(cmd, ShaderIDs.DepthCopy);
}
/**
* // 2nd downsampling pass.
* cs = m_Resources.computeShaders.multiScaleAODownsample2;
* kernel = cs.FindKernel("main");
*
* cmd.SetComputeTextureParam(cs, kernel, "DS4x", ShaderIDs.LowDepth2);
* cmd.SetComputeTextureParam(cs, kernel, "DS8x", ShaderIDs.LowDepth3);
* cmd.SetComputeTextureParam(cs, kernel, "DS16x", ShaderIDs.LowDepth4);
* cmd.SetComputeTextureParam(cs, kernel, "DS8xAtlas", ShaderIDs.TiledDepth3);
* cmd.SetComputeTextureParam(cs, kernel, "DS16xAtlas", ShaderIDs.TiledDepth4);
*
* cmd.DispatchCompute(cs, kernel, m_Widths[(int)MipLevel.L6], m_Heights[(int)MipLevel.L6], 1);
* /**/
}