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

     1  // SPDX-License-Identifier: Unlicense OR MIT
     2  
     3  // +build linux,!android,!nowayland freebsd
     4  
     5  package wm
     6  
     7  import (
     8  	"errors"
     9  	"unsafe"
    10  
    11  	"github.com/cybriq/giocore/internal/egl"
    12  )
    13  
    14  /*
    15  #cgo linux pkg-config: egl wayland-egl
    16  #cgo freebsd openbsd LDFLAGS: -lwayland-egl
    17  #cgo CFLAGS: -DEGL_NO_X11
    18  
    19  #include <EGL/egl.h>
    20  #include <wayland-client.h>
    21  #include <wayland-egl.h>
    22  */
    23  import "C"
    24  
    25  type context struct {
    26  	win *window
    27  	*egl.Context
    28  	eglWin *C.struct_wl_egl_window
    29  }
    30  
    31  func (w *window) NewContext() (Context, error) {
    32  	disp := egl.NativeDisplayType(unsafe.Pointer(w.display()))
    33  	ctx, err := egl.NewContext(disp)
    34  	if err != nil {
    35  		return nil, err
    36  	}
    37  	return &context{Context: ctx, win: w}, nil
    38  }
    39  
    40  func (c *context) Release() {
    41  	if c.Context != nil {
    42  		c.Context.Release()
    43  		c.Context = nil
    44  	}
    45  	if c.eglWin != nil {
    46  		C.wl_egl_window_destroy(c.eglWin)
    47  		c.eglWin = nil
    48  	}
    49  }
    50  
    51  func (c *context) Refresh() error {
    52  	return nil
    53  }
    54  
    55  func (c *context) MakeCurrent() error {
    56  	c.Context.ReleaseSurface()
    57  	if c.eglWin != nil {
    58  		C.wl_egl_window_destroy(c.eglWin)
    59  		c.eglWin = nil
    60  	}
    61  	surf, width, height := c.win.surface()
    62  	if surf == nil {
    63  		return errors.New("wayland: no surface")
    64  	}
    65  	eglWin := C.wl_egl_window_create(surf, C.int(width), C.int(height))
    66  	if eglWin == nil {
    67  		return errors.New("wayland: wl_egl_window_create failed")
    68  	}
    69  	c.eglWin = eglWin
    70  	eglSurf := egl.NativeWindowType(uintptr(unsafe.Pointer(eglWin)))
    71  	if err := c.Context.CreateSurface(eglSurf, width, height); err != nil {
    72  		return err
    73  	}
    74  	return c.Context.MakeCurrent()
    75  }
    76  
    77  func (c *context) Lock() {}
    78  
    79  func (c *context) Unlock() {}