github.com/cybriq/giocore@v0.0.7-0.20210703034601-cfb9cb5f3900/app/internal/wm/egl_android.go (about)

     1  // SPDX-License-Identifier: Unlicense OR MIT
     2  
     3  package wm
     4  
     5  /*
     6  #include <android/native_window_jni.h>
     7  #include <EGL/egl.h>
     8  */
     9  import "C"
    10  
    11  import (
    12  	"unsafe"
    13  
    14  	"github.com/cybriq/giocore/internal/egl"
    15  )
    16  
    17  type context struct {
    18  	win *window
    19  	*egl.Context
    20  }
    21  
    22  func (w *window) NewContext() (Context, error) {
    23  	ctx, err := egl.NewContext(nil)
    24  	if err != nil {
    25  		return nil, err
    26  	}
    27  	return &context{win: w, Context: ctx}, nil
    28  }
    29  
    30  func (c *context) Release() {
    31  	if c.Context != nil {
    32  		c.Context.Release()
    33  		c.Context = nil
    34  	}
    35  }
    36  
    37  func (c *context) Refresh() error {
    38  	return nil
    39  }
    40  
    41  func (c *context) MakeCurrent() error {
    42  	c.Context.ReleaseSurface()
    43  	var (
    44  		win           *C.ANativeWindow
    45  		width, height int
    46  	)
    47  	// Run on main thread. Deadlock is avoided because MakeCurrent is only
    48  	// called during a FrameEvent.
    49  	c.win.callbacks.Run(func() {
    50  		win, width, height = c.win.nativeWindow(c.Context.VisualID())
    51  	})
    52  	if win == nil {
    53  		return nil
    54  	}
    55  	eglSurf := egl.NativeWindowType(unsafe.Pointer(win))
    56  	if err := c.Context.CreateSurface(eglSurf, width, height); err != nil {
    57  		return err
    58  	}
    59  	if err := c.Context.MakeCurrent(); err != nil {
    60  		return err
    61  	}
    62  	return nil
    63  }
    64  
    65  func (c *context) Lock() {}
    66  
    67  func (c *context) Unlock() {}