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WIP: Draw: Split point cloud position and radius vertex buffers #113958

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Hans Goudey wants to merge 16 commits from HooglyBoogly:implicit-sharing-gpu-vertbuf into main
pull from: HooglyBoogly:implicit-sharing-gpu-vertbuf
merge into: blender:main

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Conversation 1 Commits 16 Files Changed 8 +86 -57
Hans Goudey commented 2023-10-20 00:01:44 +02:00
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Previously positions and radii were merged into a single vertex
buffer. This reduces the number of textures needed by the GPU
but it precludes some important future optimizations like using
implicit sharing for VBOs and skipping uploading the radius when
it's a single value.

Split the attributes into two VBOs, one a float3 buffer, which wasn't
possible before OpenGL 4.0, and the other a float buffer.

Previously positions and radii were merged into a single vertex buffer. This reduces the number of textures needed by the GPU but it precludes some important future optimizations like using implicit sharing for VBOs and skipping uploading the radius when it's a single value. Split the attributes into two VBOs, one a float3 buffer, which wasn't possible before OpenGL 4.0, and the other a float buffer.
Hans Goudey added 16 commits 2023-10-20 00:01:54 +02:00
ed151b09c9 WIP: Attributes: Integrate implicit sharing with the attribute API 
Add the ability to retrieve implicit sharing info directly from the
C++ attribute API, which simplifies memory usage and performance
optimizations making use of it. This commit uses the additions to
the API to avoid copies in a few places:
- The "rest_position" attribute in the mesh modifier stack
- Instance on Points node
- Instances to points node
- Mesh to points node
- Points to vertices node

Many files are affected because in order to include the new information
in the API's returned data, I had to switch a bunch of types from
`VArray` to `AttributeReader`. This generally makes sense anyway, since
it allows retrieving the domain, which wasn't possible before in some
cases. I overloaded the `*` deference operator for some syntactic sugar
to avoid the (very ugly) `.varray` that would be necessary otherwise.

TODO:
- [ ] Fix tests
    - [ ] cycles_pointcloud_cpu (Failed)
    - [ ] geo_node_attributes_test_attribute_curve_map (Failed)
    - [ ] geo_node_attributes_test_attribute_map_range (Failed)
    - [ ] geo_node_attributes_test_attribute_proximity (Failed)
    - [ ] geo_node_curves_test_handle_type_selection (Failed)
    - [ ] geo_node_curves_test_spline_parameter (Failed)
    - [ ] geo_node_geometry_test_delete_geometry (SEGFAULT)
    - [ ] geo_node_geometry_test_realize_instances_materials (Subprocess aborted)
    - [ ] geo_node_instance_test_instance_on_points (Subprocess aborted)
    - [ ] geo_node_instance_test_instance_to_points (Subprocess aborted)
    - [ ] geo_node_instance_test_instance_transforms (Subprocess aborted)
    - [ ] geo_node_mesh_test_set_position_normals_update (Subprocess aborted)
    - [ ] geo_node_points_test_point_instance (Subprocess aborted)
    - [ ] geo_node_utilities_test_accumulate_field_column_grid (Subprocess aborted)
    - [ ] geo_node_vector_test_vector_map_range (Subprocess aborted)
Hans Goudey added the
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Hans Goudey commented 2023-11-13 12:54:43 +01:00
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It turns out that GPUs don't support float3 textures on any of our GPU backends. Instead we need to move away from using textures here, before splitting these attributes. So it's not really worth keeping this PR open.

It turns out that GPUs don't support `float3` textures on any of our GPU backends. Instead we need to move away from using textures here, before splitting these attributes. So it's not really worth keeping this PR open.
Hans Goudey closed this pull request 2023-11-13 12:54:44 +01:00

Pull request closed

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