Emscripten / WebGPU failing with Emscripten 3.1.68

[ypujante]

Version/Branch of Dear ImGui:

Version 1.91.3, Branch: master

Back-ends:

imgui_impl_glfw.cpp + imgui_impl_wgpu.cpp

Compiler, OS:

Emscripten 3.1.68

Full config/build information:

No response

Details:

After upgrading to Emscripten 3.1.68 I rebuilt the example example_glfw_wgpu using

> make -f Makefile.emscripten serve

So it is using GLFW built-in (not my new port) and WebGPU.

Running results in this failures in the console (and nothing gets rendered):

(index):41 Validation error: Write range (bufferOffset: 0, size: 592656) does not fit in [Buffer "Dear ImGui Vertex buffer"] size (115240).
(index):41  - While calling [Queue].WriteBuffer([Buffer "Dear ImGui Vertex buffer"], (0 bytes), data, (592656 bytes))
(index):41 
28Write range (bufferOffset: 0, size: 592656) does not fit in [Buffer "Dear ImGui Vertex buffer"] size (115240).
 - While calling [Queue].WriteBuffer([Buffer "Dear ImGui Vertex buffer"], (0 bytes), data, (592656 bytes))
Understand this warning
(index):41 Validation error: Write range (bufferOffset: 0, size: 547616) does not fit in [Buffer "Dear ImGui Index buffer"] size (22528).
(index):41  - While calling [Queue].WriteBuffer([Buffer "Dear ImGui Index buffer"], (0 bytes), data, (547616 bytes))
(index):41 
.... etc... forever

I do not know if it is a Emscripten regression issue or an ImGui issue. I highly suspect it is a regression in Emscripten because I simply upgraded the version of Emscripten and did a build without any other code change. So unless there was something wrong with ImGui that was somehow working with a previous version, it is most likely an Emscripten regression bug.

I have opened a ticket to report it.

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

No response

[ocornut]

Linking to #8031 as it seems similar.

[ypujante]

Based on this comment it seems fairly obvious that it is not an ImGui problem but an Emscripten problem.

A workaround for the time being is to not use Emscripten 3.1.68. You can easily use a different version, one that is known to work, like this:

emsdk install 3.1.66

I will report back when it is fixed.

[ypujante]

Emscripten 3.1.69 has been released and it fixes this issue which I am closing now. I have rebuilt 1.91.3 with it and now everything is fine: