Clément Foucault
b43b62191c
This new implementation does all downsampling in a single compute shader dispatch, removing a lot of complexity from the previous recursive downsampling. This is heavilly inspired by the Single-Pass-Downsampler from GPUOpen: https://github.com/GPUOpen-Effects/FidelityFX-SPD However I do not implement all the optimization bits as they require vulkan (GL_KHR_shader_subgroup) and is not as versatile (it is only for HiZ). Timers inside renderdoc report ~0.4ms of saving on a 2048*1024 render for the whole downsampling. Note that the previous implementation only processed 6 mips where the new one processes 8 mips. ``` EEVEE ~1.0ms EEVEE-Next ~0.6ms ``` Padding has been bumped to be of 128px for processing 8 mips. A new debug option has been added (debug value 2) to validate the HiZ.
82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2021 Blender Foundation.
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*/
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/** \file
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* \ingroup eevee
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*
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* The Hierarchical-Z buffer is texture containing a copy of the depth buffer with mipmaps.
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* Each mip contains the maximum depth of each 4 pixels on the upper level.
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* The size of the texture is padded to avoid messing with the mipmap pixels alignments.
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*/
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#pragma once
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#include "DRW_render.h"
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#include "eevee_shader_shared.hh"
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namespace blender::eevee {
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class Instance;
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/* -------------------------------------------------------------------- */
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/** \name Hierarchical-Z buffer
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* \{ */
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class HiZBuffer {
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private:
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Instance &inst_;
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/** The texture containing the hiz mip chain. */
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Texture hiz_tx_ = {"hiz_tx_"};
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/**
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* Atomic counter counting the number of tile that have finished down-sampling.
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* The last one will process the last few mip level.
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*/
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draw::StorageBuffer<uint4, true> atomic_tile_counter_ = {"atomic_tile_counter"};
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/** Single pass recursive downsample. */
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DRWPass *hiz_update_ps_ = nullptr;
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/** Debug pass. */
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DRWPass *debug_draw_ps_ = nullptr;
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/** Dirty flag to check if the update is necessary. */
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bool is_dirty_ = true;
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HiZDataBuf data_;
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public:
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HiZBuffer(Instance &inst) : inst_(inst)
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{
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atomic_tile_counter_.clear_to_zero();
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};
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void sync();
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/**
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* Tag the buffer for update if needed.
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*/
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void set_dirty()
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{
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is_dirty_ = true;
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}
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/**
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* Update the content of the HiZ buffer with the depth render target.
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* Noop if the buffer has not been tagged as dirty.
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* Should be called before each passes that needs to read the hiz buffer.
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*/
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void update();
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void debug_draw(GPUFrameBuffer *view_fb);
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void bind_resources(DRWShadingGroup *grp)
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{
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DRW_shgroup_uniform_texture_ref(grp, "hiz_tx", &hiz_tx_);
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DRW_shgroup_uniform_block_ref(grp, "hiz_buf", &data_);
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}
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};
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/** \} */
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} // namespace blender::eevee
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