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app/internal/window: add needVSync() to eglDriver interface

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This enables calling eglSwapInterval with an interval value of 0 or 1
on a per driver basis.

Signed-off-by: Denis Bernard <db047h@gmail.com>
This commit is contained in:
Denis Bernard
2019-10-26 15:21:05 +02:00
committed by Elias Naur
parent 2c75f52de6
commit b78d144119
4 changed files with 15 additions and 8 deletions
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app/internal/window/egl.go
+9 -8
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@@ -28,6 +28,7 @@ type eglDriver interface {
eglDisplay() _EGLNativeDisplayType
eglWindow(visID int) (_EGLNativeWindowType, int, int, error)
eglDestroy()
needVSync() bool
}
type eglContext struct {
@@ -156,6 +157,14 @@ func (c *context) MakeCurrent() error {
c.eglWin = nilEGLNativeWindowType
return err
}
// eglSwapInterval 1 leads to erratic frame rates and unnecessary blocking.
// We rely on platform specific frame rate limiting instead, except on Windows
// and X11 where eglSwapInterval is all there is.
if c.driver.needVSync() {
eglSwapInterval(c.eglCtx.disp, 1)
} else {
eglSwapInterval(c.eglCtx.disp, 0)
}
if c.eglCtx.srgb {
return nil
}
@@ -269,13 +278,5 @@ func createSurfaceAndMakeCurrent(eglCtx *eglContext, win _EGLNativeWindowType) (
eglDestroySurface(eglCtx.disp, eglSurf)
return nilEGLSurface, fmt.Errorf("eglMakeCurrent error 0x%x", eglGetError())
}
// eglSwapInterval 1 leads to erratic frame rates and unnecessary blocking.
// We rely on platform specific frame rate limiting instead, except on Windows
// where eglSwapInterval is all there is.
if runtime.GOOS != "windows" {
eglSwapInterval(eglCtx.disp, 0)
} else {
eglSwapInterval(eglCtx.disp, 1)
}
return eglSurf, nil
}