EEVEE-Next: Optimize GBuffer Layout and writting #115541

Clément Foucault · 2023-11-28T20:48:26+01:00

Clément Foucault commented

2023-11-28 20:48:26 +01:00

This layout is more flexible and polymorphic.

While the worst case is worse (4 + 3 layers),
the common case is more optimized (2 + 2 layers).
The average written closure data is also lower
since we can compact the data for special cases
which are quite frequent.

Some adjustment had to be made in the denoise an
tile classify shaders.

Results:

Lit Scene	GBuffer Occupancy Before	GBuffer Occupancy After

TODOs:

Split GBuffer between framebuffer attachment and imageStore.
Remove use of stencil buffer.
Use GPU_framebuffer_bind_ex for clearing.
Add debug visualization.
Add optimized GBuffer configurations. (Only dielectric configuration was added as packing other types is currently ineffective or not possible)

Follow-up:

Add tile based deferred lighting to replace the stencil based rejection.

This layout is more flexible and polymorphic. While the worst case is worse (4 + 3 layers), the common case is more optimized (2 + 2 layers). The average written closure data is also lower since we can compact the data for special cases which are quite frequent. Some adjustment had to be made in the denoise an tile classify shaders. ### Results: | Lit Scene | GBuffer Occupancy Before | GBuffer Occupancy After | | -------- | -------- | -------- | | ![](https://projects.blender.org/attachments/1669147c-14f0-4bb3-ad0a-0e00c63996f6) | ![](https://projects.blender.org/attachments/f43082d3-f48f-4796-9a41-6ec1593f88e4) | ![](https://projects.blender.org/attachments/392b9dce-3e33-4f30-b3bc-4afcc9a915bb) | ### TODOs: - [x] Split GBuffer between framebuffer attachment and imageStore. - [x] Remove use of stencil buffer. - [x] Use GPU_framebuffer_bind_ex for clearing. - [x] Add debug visualization. - [x] Add optimized GBuffer configurations. (Only dielectric configuration was added as packing other types is currently ineffective or not possible) ### Follow-up: - Add tile based deferred lighting to replace the stencil based rejection.

Capture d’écran du 2023-11-30 19-42-37.png

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Capture d’écran du 2023-11-30 19-42-55.png

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Capture d’écran du 2023-11-30 19-42-21.png

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Clément Foucault added 1 commit 2023-11-28 20:48:37 +01:00

EEVEE-Next: Change GBuffer Layout c60b8728f6

This layout is more flexible and polymorphic.

While the worst case is worse (4 + 3 layers),
the common case is more optimized (2 + 2 layers).
The average written closure data is also lower
since we can compact the data for special cases
which are quite frequent.

Some adjustment had to be made in the denoise an
tile classify shaders.

Clément Foucault changed title from ~~EEVEE-Next: Change GBuffer Layout~~ to EEVEE-Next: Optimize GBuffer Layout and writting

2023-11-28 20:48:57 +01:00

Clément Foucault added the

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EEVEE-Next: Optimize GBuffer Layout and writting #115541

Results:

TODOs:

Follow-up: