Run ecode with OpenGL ES

[Curculigo]

I discovered that OpenGL ES is available on the list of renderer version. I set up a virtual machine for Windows 11 with no GPU drivers so the system only has software based OpenGL up to version 1.1, then I downloaded the ANGLE build from here:

https://github.com/mmozeiko/build-angle/releases

I thought ecode will auto detect and use OpenGL ES. It turned out to be wrong.

[SpartanJ]

No, in order to use the EGL and the GLES dll it needs to be linked against them, OpenGL ES is available without this on Windows, Linux and macOS primary as an emulation layer, it will use normal OpenGL but with a different rendering pipeline. Real GLES is available in Android and iOS or forced during compilation. There's no real benefit of using it in desktop OSes though, default rendering pipeline is always faster.

[Curculigo]

ANGLE is similar to Mesa3d for Windows, except it only provides OpenGL ES. Mesa3d for Windows provides both normal OpenGL and OpenGL ES (and Vulkan, too). The DLL name for OpenGL ES is the same on both ANGLE and Mesa3d for Windows.

[Curculigo]

OK. I got it. So ecode is linked against opengl32.dll and needs a compatible one to run. BTW, how to force using of OpenGL ES on Windows during compilation? I want to play with it a bit.

[SpartanJ]

I don't think it's possible, I've never tested it but the premake file has a parameter to force it: --with-gles2. If doesn't work please don't expect me to bring support for that, it's useless.