Fixed pyramid computation and errors

ScriptableRenderPipeline/HDRenderPipeline/HDRP/RenderPipelineResources/BufferPyramidProcessor.cs

 
                 cmd.SetComputeTextureParam(m_DepthPyramidCS, kernel, _Source, src);
                 cmd.SetComputeTextureParam(m_DepthPyramidCS, kernel, _Result, dest);
+                // The compute shader work in texture space
+                // So we must provide the texture's size
-                    srcWorkMip.width, srcWorkMip.height,
-                    (1.0f / srcMip.width) * scale.x, (1.0f / srcMip.height) * scale.y)
+                    src.rt.width, src.rt.height,
+                    (1.0f / src.rt.width), (1.0f / src.rt.height))
                 );
 
                 cmd.DispatchCompute(
                     1
                 );
 
-                var dstMipWidthToCopy = Mathf.Min(targetTexture.rt.width >> (i + 1), dstWorkMip.width);
-                var dstMipHeightToCopy = Mathf.Min(targetTexture.rt.height >> (i + 1), dstWorkMip.height);
+                var dstMipWidthToCopy = Mathf.Min(Mathf.Min(targetTexture.rt.width >> (i + 1), dstWorkMip.width), mips[i].rt.width);
+                var dstMipHeightToCopy = Mathf.Min(Mathf.Min(targetTexture.rt.height >> (i + 1), dstWorkMip.height), mips[i].rt.height);
 
                 // If we could bind texture mips as UAV we could avoid this copy...(which moreover copies more than the needed viewport if not fullscreen)
                 cmd.CopyTexture(mips[i], 0, 0, 0, 0, dstMipWidthToCopy, dstMipHeightToCopy, targetTexture, 0, i + 1, 0, 0);
                 cmd.SetComputeVectorParam(
                     m_ColorPyramidCS,
                     _Size,
-                    new Vector4(dest.width, dest.height, 1f / dest.width, 1f / dest.height)
+                    new Vector4(src.width >> 1, src.height >> 1, 1f / (src.width >> 1), 1f / (src.height >> 1))
                 );
                 cmd.DispatchCompute(
                     m_ColorPyramidCS,
                     1
                 );
 
-                var dstMipWidthToCopy = Mathf.Min(targetTexture.width >> (i + 1), dstWorkMip.width);
-                var dstMipHeightToCopy = Mathf.Min(targetTexture.height >> (i + 1), dstWorkMip.height);
+                var dstMipWidthToCopy = Mathf.Min(Mathf.Min(targetTexture.width >> (i + 1), dstWorkMip.width), mips[i].width);
+                var dstMipHeightToCopy = Mathf.Min(Mathf.Min(targetTexture.height >> (i + 1), dstWorkMip.height), mips[i].height);
 
                 // If we could bind texture mips as UAV we could avoid this copy...(which moreover copies more than the needed viewport if not fullscreen)
                 cmd.CopyTexture(