Add support for SDL2 backend

[Srinivasa314]

CzechBlueBear/NonEuclidean adds support for SDL2 backend but unfortunately it is has a lot of bugs. This pull request will merge changes from his repo with the following changes

• Fix white screen due to error in shaders
• Fix number key input
• Fix windows build error
• Add Esc and Alt-Enter keyboard shortcuts
• Make mouse be grabbed and hidden
• Do keypress handling in SDL eventloop
• Updated README to include SDL
• Use reference for cur_ticks
• Remove redeclaration of SwapBuffers
• Compile in release mode
• Update .gitignore

[y4my4my4m]

@Srinivasa314 this compiles and runs with no problems, however:

1) input delay / strange input behaviour

2) the window doesnt open on the main monitor but at 0,0 coordinate and cant really be readjusted

[Srinivasa314]

1. input delay / strange input behaviour

I am not entirely sure. This is what I think. The player continues to move for a while after input is stopped because it takes some time for friction to stop it. If you increase the friction value then the player stops immediately after input is stopped.

2. the window doesnt open on the main monitor but at 0,0 coordinate and cant really be readjusted

Fixed it. Now window is centered.

[y4my4my4m]

1. input delay / strange input behaviour

I am not entirely sure. This is what I think. The player continues to move for a while after input is stopped because it takes some time for friction to stop it. If you increase the friction value then the player stops immediately after input is stopped.

1. the window doesnt open on the main monitor but at 0,0 coordinate and cant really be readjusted

Fixed it. Now window is centered.

Centering works great now!

Initial input has a good 9 seconds delay though, but if this doesn't happen on your end it may just be my environment.

[hamdav]

I found that compiling on mac I had to change the -lGL flag to -framework OpenGl. Even then though it compiled fine but I got segmentation fault when running it. Compiling on Arch linux worked fine, the only thing is that I could not move my mouse and walk at the same time.

[Srinivasa314]

I found that compiling on mac I had to change the -lGL flag to -framework OpenGl

Fixed it

Even then though it compiled fine but I got segmentation fault when running it

I do not have a mac. Can you show the stacktrace?

Compiling on Arch linux worked fine, the only thing is that I could not move my mouse and walk at the same time.

I think it is because in some desktop environments you cannot use the keyboard and the mouse at the same time. If it is because of that then you can change that setting.

[hamdav]

No trace, just segmentation fault (core dumped) I think...

[Srinivasa314]

You can use lldb or any other debugger to get the stack trace. Add -g to CXXFLAGS in the Makefile before compiling so that more information will be available to the debugger.

[hamdav]

It says

2021-03-14 19:16:24.091865+0100 NonEuclidean[62142:2193080] SecTaskLoadEntitlements failed error=22 cs_flags=20, pid=62142
2021-03-14 19:16:24.091957+0100 NonEuclidean[62142:2193080] SecTaskCopyDebugDescription: NonEuclidean[62142]/0#-1 LF=0
2021-03-14 19:16:24.350535+0100 NonEuclidean[62142:2193080] [plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x10052c560> F8BB1C28-BAE8-11D6-9C31-00039315CD46
Process 62142 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x0000000000000000
error: memory read failed for 0x0
Target 0: (NonEuclidean) stopped.

I also have to add -std=c++11 for it to compile btw, it complains about a bunch of stuff otherwise and gives an error that

error: a space is required between consecutive
      right angle brackets (use '> >')

[Srinivasa314]

I think I fixed it. Check if it works now.

[rsmath]

Hello, where can I get the code that compiles and works on mac please? Thank you.

[rsmath]

@Srinivasa314 @Srikanth-M-02 could you please tell me how to get the code that will run on Mac?

[Srinivasa314]

1) Download xcode command line tools 2) install glew and sdl2 (you can use brew install) 3) git clone https://github.com/Srinivasa314/NonEuclidean then cd NonEuclidean/NonEuclidean 4) export CPATH="/opt/homebrew/Cellar/glew/2.2.0_1/include/:/opt/homebrew/Cellar/sdl2/2.24.0/include/" export LIBRARY_PATH="/opt/homebrew/Cellar/sdl2/2.24.0/lib:/opt/homebrew/Cellar/glew/2.2.0_1/lib" 5) change the above command depending on where glew and sdl2 were installed 6) run make all 7) ./NonEuclidean As of now scenes 4 and 7 dont work properly on my mac

[Srinivasa314]

Is it working @ramanshsharma2806 ?

[Srinivasa314]

Btw scene 4 works if I replace the bunny.obj and suzanne.obj with other obj files and scene 7 works if I disable GL_LINEAR_MIPMAP_NEAREST and glGenerateMipmap

[Sussy-OS]

Would PR #26 work with this? Currently, if you were to put glew-2.1.0 in the directory with the .exe, it would fail to build. #26 fixes this. It would be handy, (with permission) to merge that PR into this one.

[ehx-v1]

@Sussy-OS They're PRs for the same repo anyway, so the permission should already be implicitly there. Would definitely be great if this worked.