Directly copy data into uniform buffers #9865
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
james7132
added
A-Rendering
4 tasks
alice-i-cecile
approved these changes
Sep 20, 2023
alice-i-cecile
added
the
S-Ready-For-Final-Review
mockersf
approved these changes
Sep 25, 2023
43 tasks
rdrpenguin04
pushed a commit
to rdrpenguin04/bevy
that referenced
this pull request
Jan 9, 2024
# Objective This is a minimally disruptive version of bevyengine#8340. I attempted to update it, but failed due to the scope of the changes added in bevyengine#8204. Fixes bevyengine#8307. Partially addresses bevyengine#4642. As seen in bevyengine#8284, we're actually copying data twice in Prepare stage systems. Once into a CPU-side intermediate scratch buffer, and once again into a mapped buffer. This is inefficient and effectively doubles the time spent and memory allocated to run these systems. ## Solution Skip the scratch buffer entirely and use `wgpu::Queue::write_buffer_with` to directly write data into mapped buffers. Separately, this also directly uses `wgpu::Limits::min_uniform_buffer_offset_alignment` to set up the alignment when writing to the buffers. Partially addressing the issue raised in bevyengine#4642. Storage buffers and the abstractions built on top of `DynamicUniformBuffer` will need to come in followup PRs. This may not have a noticeable performance difference in this PR, as the only first-party systems affected by this are view related, and likely are not going to be particularly heavy. --- ## Changelog Added: `DynamicUniformBuffer::get_writer`. Added: `DynamicUniformBufferWriter`.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Objective
This is a minimally disruptive version of #8340. I attempted to update it, but failed due to the scope of the changes added in #8204.
Fixes #8307. Partially addresses #4642. As seen in #8284, we're actually copying data twice in Prepare stage systems. Once into a CPU-side intermediate scratch buffer, and once again into a mapped buffer. This is inefficient and effectively doubles the time spent and memory allocated to run these systems.
Solution
Skip the scratch buffer entirely and use
wgpu::Queue::write_buffer_withto directly write data into mapped buffers.Separately, this also directly uses
wgpu::Limits::min_uniform_buffer_offset_alignmentto set up the alignment when writing to the buffers. Partially addressing the issue raised in #4642.Storage buffers and the abstractions built on top of
DynamicUniformBufferwill need to come in followup PRs.This may not have a noticeable performance difference in this PR, as the only first-party systems affected by this are view related, and likely are not going to be particularly heavy.
Changelog
Added:
DynamicUniformBuffer::get_writer.Added:
DynamicUniformBufferWriter.