From deff49c901915e007f43a1df1a0d217a786e9f06 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Thu, 27 Aug 2015 13:15:44 +0200
Subject: Bug 1202 - Add support of Adaptive Vsync via
[GLX|WGL]_EXT_swap_control_tear
[GLX|WGL]_EXT_swap_control_tear extensions support
asynchronous buffer swaps, i.e. adaptive Vsync.
<https://www.opengl.org/wiki/SwapInterval_aka_vsync#Adaptive_Vsync>
<https://www.opengl.org/registry/specs/EXT/wgl_swap_control_tear.txt>
<https://www.opengl.org/registry/specs/EXT/glx_swap_control_tear.txt>
<http://keithp.com/blogs/async_flip/>
The extensions utilizes a negative interval value,
enabling late swaps to occur without synchronization to the video frame.
Hence '-1' has new semantics, previously it was the 'default value'
of 'untouched vsync interval'.
New default is:
- 0 for unrealized context
- 1 for realized context
+++
It requires [GLX|WGL]_EXT_swap_control,
hence we shall ensure to use use this extension
in the implementation of GLContext.setSwapInterval(..).
+++
Mesa3D seems to support GLX_SGI_swap_control only.
+++
Implemented on Windows and X11.
+++
On GNU/Linux using NVidia driver w/ my setup(*), sadly the query
GLX.glXQueryDrawable(displayHandle, drawable.getHandle(), GLX.GLX_LATE_SWAPS_TEAR_EXT, val);
always returns zero here, indicating async vsync is not supported.
(Queried the attribute for every frame in windowed or fullscreen mode)
Fullscreen
(*)
- Debian 8
- Kernel 3.16
- KDE/Kwin
- GL Version 4.5 (Core profile, arb, compat[ES2, ES3, ES31], FBO, hardware) - 4.5.0 NVIDIA 355.06 [GL 4.5.0, vendor 355.6.0 (NVIDIA 355.06)]
- GL_RENDERER GeForce GTX 660/PCIe/SSE2
- Samsung U28D590 (DFP-4): Internal DisplayPort
+++
---
src/jogl/classes/jogamp/opengl/egl/EGLContext.java | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
(limited to 'src/jogl/classes/jogamp/opengl/egl/EGLContext.java')
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLContext.java b/src/jogl/classes/jogamp/opengl/egl/EGLContext.java
index b6a05aeeb..b64bb375a 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLContext.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLContext.java
@@ -51,7 +51,6 @@ import jogamp.opengl.GLContextImpl;
import jogamp.opengl.GLDrawableImpl;
import jogamp.opengl.egl.EGLExtImpl;
import jogamp.opengl.egl.EGLExtProcAddressTable;
-import jogamp.opengl.windows.wgl.WindowsWGLContext;
import com.jogamp.common.ExceptionUtils;
import com.jogamp.common.nio.Buffers;
@@ -432,11 +431,20 @@ public class EGLContext extends GLContextImpl {
}
@Override
- protected boolean setSwapIntervalImpl(final int interval) {
+ protected final Integer setSwapIntervalImpl(final int interval) {
if( hasRendererQuirk(GLRendererQuirks.NoSetSwapInterval) ) {
- return false;
+ return null;
}
- return EGL.eglSwapInterval(drawable.getNativeSurface().getDisplayHandle(), interval);
+ final int useInterval;
+ if( 0 > interval ) {
+ useInterval = Math.abs(interval);
+ } else {
+ useInterval = interval;
+ }
+ if( EGL.eglSwapInterval(drawable.getNativeSurface().getDisplayHandle(), useInterval) ) {
+ return Integer.valueOf(useInterval);
+ }
+ return null;
}
static long eglGetProcAddress(final long eglGetProcAddressHandle, final String procname)
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