Added WGVK backend

[r-lyeh]

Let's see how the CI takes this one.

• Clean restart from our last PR. This is using latest DearImgui commit + latest WGVK.
• Provided SPIRV binary shaders as a WGSL fallback.
• Fixed GLFW3+SDL2+SDL3 examples.
• Emscripten and/or Dawn code paths are untouched.

[ocornut]

Thanks.
(FYI git info: you don’t need to create a new PR to clean an existing one. As 1 PR = 1 branch all you need to do is to force push changes to an existing PR branch if you want to eg clean history.)

[ocornut]

Linking to #9246 and #9257 for conversation history.

[ocornut]

Where do you obtain the wgslc tool mentioned to create spirv from wgsl ?

[r-lyeh]

CMakeLists.txt
main.cpp.txt

[r-lyeh]

not sure why these are not added in some tools/ subfolder in the WGVK repo

[ocornut]

Thank you.

I wanted to make sure I could rebuild the output. I confirmed I could rebuild it.
I added spv_options.strip_all_names = true; to the converter, which reduced SPIRV binaries from 4264 bytes to 3388 bytes, and I exported them using binary_to_compressed_c -u8 -nocompress which reduced the sources files by 20k-30k and line count by -220 lines. I squashed this into your commit to avoid storing unnecessary data in git permanent history.

Merged as 5978002 + minor subsequent amends 59183cf.

I also confirmed I managed to build WGVK and run the example on my PC.

While this is not yet provided as a stock .vcproj, it was very refreshing that building with WGVK was comparatively much easier and faster than building with e.g. DAWN. This becomes an alternative that I can envision running and testing much more than DAWN.

For anyone attempting to build examples,

• Add %WGVK_DIR%/include to include path.
• Add %WVGK_DIR%/src/wgvk.c file to project, compile with latest C standard w/ C11 atomics (in visual studio it needed /experimental:c11atomics command-line flag).

One last missing thing would be updating the CMakefile in examples/ to document and build with WGVK.

[ocornut]

I have now added support for WGVK in the 3 Cmakelist files with ed2e5dd

[r-lyeh]

great work! thanks omar. not sure how complete/on par wgvk is against the other standards but it is definitely waaaaay better and faster than going with the classic dawn/wgpu/emscripten path imho. for dearimgui use cases it might eventually suffice with a lil bit of luck.

[ocornut]

It currently asserts on latest WGVK because of manuel5975p/WGVK@d9c6dad

[ocornut]

Pushed e887098 to always use SPIR-V shaders on WGVK.

Tho I am not sure the assert added by manuel5975p/WGVK@d9c6dad is wise. @manuel5975p: Is there a way at runtime or compile-time (in our code) to reliably detect if WGVK will support WGSL shaders? There's no reason for SUPPORT_WGSL to be set in your compilation unit.

[manuel5975p]

@ocornut I proposed a way to fix this in #9387, let me know what you think.