Use Metal on macOS

[hajimehoshi]

https://developer.apple.com/macos/whats-new/

Deprecation of OpenGL and OpenCL

[hajimehoshi]

This would mean I would need to give up using GLFW.

kovidgoyal/kitty#972

It looks like Apple is really deprecating OpenGL.

[hajimehoshi]

I plan to use @dmitshur's https://dmitri.shuralyov.com/gpu/mtl

See also https://dmitri.shuralyov.com/blog/26

[hajimehoshi]

Current status: https://github.com/hajimehoshi/ebiten/blob/metal/internal/graphicsdriver/metal/driver.go Succeeded to render examples!

Most rendering part has been implemented.

Remaining tasks:

• [MUST] Pass all the tests
  • [MUST] Blending function
  • [MUST] Nearest/Linear filter
• [MUST] Correct memory management
• [MUST] Enable to switch vsync
• [MUST] Run all the examples correctly
• [MUST] Implement some missing functions (e.g. MaxImageSize)
• [WANT] Better performance by synchronization
• [WANT] Context lost? (Does this happen?)

[Noofbiz]

Are you still using glfw 3.2 or something else for the window?

[hajimehoshi]

Yes, I'm still using GLFW 3.2 as 'No API' mode. The application runs with a Cocoa window without OpenGL initialization and context. Metal's rendering works on the Cocoa window.

For more details, @dmitshur's https://dmitri.shuralyov.com/gpu/mtl/example/movingtriangle is a great example.

[hajimehoshi]

Most of them are implemented. Now I'm fixing a bug that screen flickers on fullscreen mode.

EDIT: Fixed: the cause was multiple PresentDrawable call for the same Drawable object.

[hajimehoshi]

Now all the examples worked correctly!