LEGACY_GL_EMULATION does not work with emscripten_webgl_create_context

[Daft-Freak]

port of sdl2glshader.c

Noticed this looking at #5580. Looks like the init function never gets called. Calling it may get messy though as it doesn't look like the emulation would deal with multiple contexts. (I'm not sure these should work together, but then LEGACY_GL_EMULATION would stop working with EGL and SDL2)

[stale]

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[Daft-Freak]

I haven't looked at multiple GL contexts in SDL for a while, but this is still an issue. I can get the example to work by adding a EM_ASM("Module.useWebGL = true; GLImmediate.init();"); after emscripten_webgl_make_context_current, so it seems it's just immedate mode emulation that isn't getting inited.

[stale]

This issue has been automatically marked as stale because there has been no activity in the past year. It will be closed automatically if no further activity occurs in the next 30 days. Feel free to re-open at any time if this issue is still relevant.

[Daft-Freak]

I'm hitting this again trying to port SDL2 away from EGL... and I'm still not sure what to do here. It's a bit of a mixing legacy/non-legacy API problem, but using EGL in SDL2 is blocking some work (no support for specifying canvas)... and we also have a bunch of tests here that rely on legacy GL working.

[ColleagueRiley]

This still seems to be an issue, running EM_ASM("Module.useWebGL = true; GLImmediate.init();"); works but then it breaks support for newer versions of OpenGL