Cannot set maxColorAttachmentBytesPerSample when requesting device

[pkomon-tgm]

Setting maxColorAttachmentBytesPerSample as required limit when requesting device has no effect. Devices always have the default limit of 32.

This is caused by a bug in emscripten. When requesting the webGPU device, the fields of the C struct requiredLimits are copied into a javascript object, but the field maxColorAttachmentBytesPerSample is missing.

See emscripten-core/emscripten#21798.

[pkomon-tgm]

This has been fixed with PR emscripten-core/emscripten#21799 and is already merged to main 🥳

We should keep this issue around until it makes it into the next release. Then we can remove applying the patch manually from our setup instructions in the README.

Additionally, we get rid of the two code paths here, as that PR also implemented wgpuAdapterGetLimits for emscripten.

webigeo/webgpu_engine/Window.cpp

Lines 798 to 806 in 145f371

	// wgpuAdapterGetLimits is not supported in Chrome yet
	#ifndef __EMSCRIPTEN__
	WGPUSupportedLimits supported_limits {};
	wgpuAdapterGetLimits(m_adapter, &supported_limits);
	required_limits.limits.maxTextureArrayLayers = supported_limits.limits.maxTextureArrayLayers;
	#else
	// use 256 as it is supported on all devices according to https://web3dsurvey.com/webgpu/limits/maxTextureArrayLayers
	required_limits.limits.maxTextureArrayLayers = 256;
	#endif