Why does SDL try to make reference to emscripten webgl if I've disabled all renderers? about sdl HOT 4 OPEN

I think this is probably an assumption that one is using WebGL in emscripten, but afaict it doesn't rely on it (Emscripten_CreateWindow has an #ifdef SDL_VIDEO_OPENGL_EGL in there, so you can create an SDL Window without it creating a GL context.

I think we probably just need some preprocessor checks in SDL_emscriptenopengles.c to fix this, assuming we don't need any extra specific magic for WebGPU support on top of this.

from sdl.

Do we even need to create an SDL window to use Emscripten with the canvas? I mean last time I checked the event system doesn't work without initialising the video subsystem so I think I have to create a window.

from sdl.

You have to create an SDL window if you want to get SDL events and other things, but I think the canvas exists on the page already, so you can probably just mess with it via JavaScript (and probably have to at least a little to set up WebGPU, I presume).

Anyhow, the build issue I will fix, but my initial look at the code suggests SDL won't actually try to initialize WebGL unless you use SDL_WINDOW_OPENGL when creating a window, so this is strictly a linking issue that needs to be resolved.

(And in the short term, it's safe to just link that part of Emscripten in, it just won't actually be used.)

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If someone comes across this problem, you need give these linker flags to get rid of a bunch of linker errors to OpenGL functions:

append_compiler_flags("-sMIN_WEBGL_VERSION=2")
append_compiler_flags("-sMAX_WEBGL_VERSION=2")

Then you need to link the Javascript html5_webgl.js library, or -sAUTO_JS_LIBRARIES=1.

This is what you need if you call SDL_createwindow.

This took me an entire day to figure out, working with this sort of stuff without documentation is so hard.

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