diff options
author | Sven Gothel <[email protected]> | 2015-08-27 13:15:44 +0200 |
---|---|---|
committer | Sven Gothel <[email protected]> | 2015-08-27 13:15:44 +0200 |
commit | deff49c901915e007f43a1df1a0d217a786e9f06 (patch) | |
tree | 46b5c4ed38772c1f5d32498904da9318b3ecab83 /src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java | |
parent | 8b4f68a3a014c3ae62a64def3011ccc43e8c41c9 (diff) |
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
+++
Diffstat (limited to 'src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java')
-rw-r--r-- | src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java index a8269ad5c..6ff8c57c8 100644 --- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java +++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLContext.java @@ -50,6 +50,7 @@ import com.jogamp.nativewindow.NativeSurface; import com.jogamp.opengl.GLContext; import com.jogamp.opengl.GLException; import com.jogamp.opengl.GLCapabilitiesImmutable; +import com.jogamp.common.ExceptionUtils; import com.jogamp.common.nio.Buffers; import com.jogamp.gluegen.runtime.ProcAddressTable; import com.jogamp.gluegen.runtime.opengl.GLProcAddressResolver; @@ -59,6 +60,7 @@ import com.jogamp.opengl.GLRendererQuirks; import jogamp.nativewindow.windows.GDI; import jogamp.opengl.GLContextImpl; import jogamp.opengl.GLDrawableImpl; +import jogamp.opengl.GLXExtensions; public class WindowsWGLContext extends GLContextImpl { static final Map<String, String> extensionNameMap; @@ -70,7 +72,8 @@ public class WindowsWGLContext extends GLContextImpl { // Table that holds the addresses of the native C-language entry points for // WGL extension functions. private WGLExtProcAddressTable wglExtProcAddressTable; - private int hasSwapIntervalSGI = 0; + /** 2 WGL_EXT_swap_control_tear, 1 WGL_EXT_swap_control, 0 undefined, -1 none */ + private int hasSwapInterval = 0; private int hasSwapGroupNV = 0; static { @@ -93,7 +96,7 @@ public class WindowsWGLContext extends GLContextImpl { wglGLReadDrawableAvailable=false; // no inner state _wglExt=null; wglExtProcAddressTable=null; - hasSwapIntervalSGI = 0; + hasSwapInterval = 0; hasSwapGroupNV = 0; super.resetStates(isInit); } @@ -487,19 +490,39 @@ public class WindowsWGLContext extends GLContextImpl { } @Override - protected boolean setSwapIntervalImpl(final int interval) { - final WGLExt wglExt = getWGLExt(); - if(0==hasSwapIntervalSGI) { + protected final Integer setSwapIntervalImpl(final int interval) { + if( 0 == hasSwapInterval ) { try { - hasSwapIntervalSGI = wglExt.isExtensionAvailable("WGL_EXT_swap_control")?1:-1; - } catch (final Throwable t) { hasSwapIntervalSGI=1; } + if ( isExtensionAvailable(GLXExtensions.WGL_EXT_swap_control) ) { + hasSwapInterval = 1; + if ( isExtensionAvailable(GLXExtensions.WGL_EXT_swap_control_tear) ) { + hasSwapInterval = 2; + if(DEBUG) { System.err.println("WGLContext.setSwapInterval.2 using: "+GLXExtensions.WGL_EXT_swap_control_tear + ", " + GLXExtensions.WGL_EXT_swap_control_tear); } + } else { + hasSwapInterval = 1; + if(DEBUG) { System.err.println("WGLContext.setSwapInterval.1 using: "+GLXExtensions.WGL_EXT_swap_control); } + } + } else { + hasSwapInterval = -1; + if(DEBUG) { System.err.println("WGLContext.setSwapInterval.0 N/A"); } + } + } catch (final Throwable t) { hasSwapInterval=-1; if(DEBUG) { ExceptionUtils.dumpThrowable("", t); } } } - if (hasSwapIntervalSGI>0) { + if ( 0 < hasSwapInterval ) { // 2 || 1 + final int useInterval; + if( 1 == hasSwapInterval && 0 > interval ) { + useInterval = Math.abs(interval); + } else { + useInterval = interval; + } try { - return wglExt.wglSwapIntervalEXT(interval); - } catch (final Throwable t) { hasSwapIntervalSGI=-1; } + final WGLExt wglExt = getWGLExt(); + if( wglExt.wglSwapIntervalEXT(useInterval) ) { + return Integer.valueOf(useInterval); + } + } catch (final Throwable t) { hasSwapInterval=-1; if(DEBUG) { ExceptionUtils.dumpThrowable("", t); } } } - return false; + return null; } private final int initSwapGroupImpl(final WGLExt wglExt) { |