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[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
+++
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