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app/internal/egl: support surfaceless contexts

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-11-28 14:53:24 +01:00
parent 5016c98739
commit c49f214f4a
1 changed files with 29 additions and 13 deletions
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app/internal/egl/egl.go
+29 -13
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@@ -26,17 +26,21 @@ type Context struct {
type Driver interface { type Driver interface {
EGLDisplay() NativeDisplayType EGLDisplay() NativeDisplayType
EGLWindow(visID int) (NativeWindowType, int, int, error)
EGLDestroy() EGLDestroy()
}
type WindowDriver interface {
EGLWindow(visID int) (NativeWindowType, int, int, error)
NeedVSync() bool NeedVSync() bool
} }
type eglContext struct { type eglContext struct {
disp _EGLDisplay disp _EGLDisplay
config _EGLConfig config _EGLConfig
ctx _EGLContext ctx _EGLContext
visualID int visualID int
srgb bool srgb bool
surfaceless bool
} }
var ( var (
@@ -106,6 +110,10 @@ func NewContext(d Driver) (*Context, error) {
if err != nil { if err != nil {
return nil, err return nil, err
} }
if _, windowed := d.(WindowDriver); !windowed && !eglCtx.surfaceless {
eglDestroyContext(eglCtx.disp, eglCtx.ctx)
return nil, errors.New("EGL_KHR_surfaceless_context not supported")
}
c := &Context{ c := &Context{
driver: d, driver: d,
eglCtx: eglCtx, eglCtx: eglCtx,
@@ -134,7 +142,14 @@ func (c *Context) destroySurface() {
} }
func (c *Context) MakeCurrent() error { func (c *Context) MakeCurrent() error {
win, width, height, err := c.driver.EGLWindow(int(c.eglCtx.visualID)) wdriver, ok := c.driver.(WindowDriver)
if !ok {
if !eglMakeCurrent(c.eglCtx.disp, nilEGLSurface, nilEGLSurface, c.eglCtx.ctx) {
return fmt.Errorf("eglMakeCurrent error 0x%x", eglGetError())
}
return nil
}
win, width, height, err := wdriver.EGLWindow(int(c.eglCtx.visualID))
if err != nil { if err != nil {
return err return err
} }
@@ -163,7 +178,7 @@ func (c *Context) MakeCurrent() error {
// eglSwapInterval 1 leads to erratic frame rates and unnecessary blocking. // eglSwapInterval 1 leads to erratic frame rates and unnecessary blocking.
// We rely on platform specific frame rate limiting instead, except on Windows // We rely on platform specific frame rate limiting instead, except on Windows
// and X11 where eglSwapInterval is all there is. // and X11 where eglSwapInterval is all there is.
if c.driver.NeedVSync() { if wdriver.NeedVSync() {
eglSwapInterval(c.eglCtx.disp, 1) eglSwapInterval(c.eglCtx.disp, 1)
} else { } else {
eglSwapInterval(c.eglCtx.disp, 0) eglSwapInterval(c.eglCtx.disp, 0)
@@ -253,11 +268,12 @@ func createContext(disp NativeDisplayType) (*eglContext, error) {
} }
} }
return &eglContext{ return &eglContext{
disp: eglDisp, disp: eglDisp,
config: _EGLConfig(eglCfg), config: _EGLConfig(eglCfg),
ctx: _EGLContext(eglCtx), ctx: _EGLContext(eglCtx),
visualID: int(visID), visualID: int(visID),
srgb: srgb, srgb: srgb,
surfaceless: hasExtension(exts, "EGL_KHR_surfaceless_context"),
}, nil }, nil
} }