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IO: C++ STL exporter #114862

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Aras Pranckevicius merged 19 commits from aras_p/blender:io-cpp-stl-exporter into main 2023-11-19 16:41:30 +01:00
Conversation 3 Commits 19 Files Changed 10 +445 -3
Aras Pranckevicius commented 2023-11-14 19:32:04 +01:00
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There was a C++ STL importer since Blender 3.3, but no corresponding C++ STL exporter. This PR is adding said exporter: taking #105598 and finishing it (agreed with original author).

Exporting Suzanne with 6 level subdivision (4 million triangles), on M1 Max:

  • Binary: python exporter 7.8 sec -> C++ exporter 0.9 sec.
  • Ascii: python exporter 13.1 sec -> C++ exporter 4.5 sec.
There was a C++ STL importer since Blender 3.3, but no corresponding C++ STL exporter. This PR is adding said exporter: taking https://projects.blender.org/blender/blender/pulls/105598 and finishing it (agreed with original author). Exporting Suzanne with 6 level subdivision (4 million triangles), on M1 Max: - Binary: python exporter 7.8 sec -> C++ exporter 0.9 sec. - Ascii: python exporter 13.1 sec -> C++ exporter 4.5 sec.
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Aras Pranckevicius added 13 commits 2023-11-14 19:32:18 +01:00
8a804f49bf Merge branch 'main' into io-cpp-stl-exporter 
# Conflicts:
#	scripts/startup/bl_ui/space_topbar.py
#	source/blender/editors/io/io_stl_ops.cc
#	source/blender/io/stl/CMakeLists.txt
#	source/blender/io/stl/IO_stl.cc
#	source/blender/io/stl/IO_stl.hh
2090aa76e1 STL: naming conventions 
- use_apply_modifiers -> apply_modifiers
- use_selection_only -> export_selected_objects
- use_ascii -> ascii_format
Aras Pranckevicius added 1 commit 2023-11-17 14:49:01 +01:00
Aras Pranckevicius added 1 commit 2023-11-17 15:04:26 +01:00
buildbot/vexp-code-patch-coordinator Build done. Details
ad5d7abca5 Merge branch 'main' into io-cpp-stl-exporter
Aras Pranckevicius commented 2023-11-17 15:04:42 +01:00
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@blender-bot build

@blender-bot build
Aras Pranckevicius changed title from WIP: IO: C++ STL exporter, continued to IO: C++ STL exporter 2023-11-17 15:30:20 +01:00
Aras Pranckevicius added the
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Import Export
 label 2023-11-17 15:34:40 +01:00
Aras Pranckevicius added this to the Pipeline, Assets & IO project 2023-11-17 15:34:47 +01:00
Aras Pranckevicius requested review from Hans Goudey 2023-11-17 15:34:59 +01:00
Hans Goudey reviewed 2023-11-18 23:27:43 +01:00
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This seems pretty straightforward. It's a nice short exporter!

To me the virtual file writer class doesn't seem necessary though. The behavior is only switched in two places-- when initially creating the file, and inside of the hot loop. For the former, just one extra check seems fine, and getting rid of the virtual function call in the hot loop seems nicer anyway (writing multiple triangles in batches might help too? but fine to leave some performance on the table for now-- the virtual class comment is more about avoiding unnecessary code complexity).

This seems pretty straightforward. It's a nice short exporter! To me the virtual file writer class doesn't seem necessary though. The behavior is only switched in two places-- when initially creating the file, and inside of the hot loop. For the former, just one extra check seems fine, and getting rid of the virtual function call in the hot loop seems nicer anyway (writing multiple triangles in batches might help too? but fine to leave some performance on the table for now-- the virtual class comment is more about avoiding unnecessary code complexity).
source/blender/editors/io/io_stl_ops.cc Outdated
@ -27,0 +93,4 @@
sub, op_props_ptr, "apply_modifiers", UI_ITEM_NONE, IFACE_("Apply Modifiers"), ICON_NONE);
}
static void wm_stl_export_draw([[maybe_unused]] bContext *C, wmOperator *op)
Hans Goudey commented 2023-11-18 23:23:15 +01:00
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Our standard way of marking unused arguments is /*C*/ in C++ code. [[maybe_unused]] is more designed for templates and if constexpr code where whether something is used depends on some metaprogramming or something.

Our standard way of marking unused arguments is `/*C*/` in C++ code. `[[maybe_unused]]` is more designed for templates and `if constexpr` code where whether something is used depends on some metaprogramming or something.
aras_p marked this conversation as resolved
source/blender/editors/io/io_stl_ops.cc Outdated
@ -27,0 +116,4 @@
return changed;
}
void WM_OT_stl_export(struct wmOperatorType *ot)
Hans Goudey commented 2023-11-18 23:24:03 +01:00
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Unnecessary struct in C++

Unnecessary `struct` in C++
aras_p marked this conversation as resolved
Aras Pranckevicius added 3 commits 2023-11-19 12:35:29 +01:00
buildbot/vexp-code-patch-coordinator Build done. Details
68f9bd3568 Merge branch 'main' into io-cpp-stl-exporter
Aras Pranckevicius commented 2023-11-19 12:37:42 +01:00
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To me the virtual file writer class doesn't seem necessary though.

Indeed, just folded them both into one simple writer class. No virtuals, and fewer lines of code too.

It should be easy to write multiple triangles at once indeed, but I'd rather do that sometime later.

> To me the virtual file writer class doesn't seem necessary though. Indeed, just folded them both into one simple writer class. No virtuals, and fewer lines of code too. It should be easy to write multiple triangles at once indeed, but I'd rather do that sometime later.
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Aras Pranckevicius commented 2023-11-19 12:43:14 +01:00
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@blender-bot build

@blender-bot build
Hans Goudey approved these changes 2023-11-19 13:22:37 +01:00
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Looks good. The export does feel noticeably way faster than the Python version. And nice that there's still room for improvement :D

Not sure the FileWriter class is necessary at all TBH, but I guess it's a common abstraction among other exporters, and it doesn't matter so much.

Looks good. The export does feel noticeably way faster than the Python version. And nice that there's still room for improvement :D Not sure the `FileWriter` class is necessary at all TBH, but I guess it's a common abstraction among other exporters, and it doesn't matter so much.
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source/blender/io/stl/exporter/stl_export_writer.cc
@ -0,0 +48,4 @@
* triangles have been written). */
fwrite(&tris_num_, sizeof(uint32_t), 1, file_);
}
}
Hans Goudey commented 2023-11-19 13:11:32 +01:00
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Usually there are newlines between functions.

Usually there are newlines between functions.
aras_p marked this conversation as resolved
Aras Pranckevicius added 1 commit 2023-11-19 16:40:20 +01:00
Aras Pranckevicius merged commit 17c793e43c into main 2023-11-19 16:41:30 +01:00
Aras Pranckevicius deleted branch io-cpp-stl-exporter 2023-11-19 16:41:32 +01:00
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