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authorSven Gothel <[email protected]>2015-08-27 13:15:44 +0200
committerSven Gothel <[email protected]>2015-08-27 13:15:44 +0200
commitdeff49c901915e007f43a1df1a0d217a786e9f06 (patch)
tree46b5c4ed38772c1f5d32498904da9318b3ecab83 /tools/jackpotc/.gitignore
parent8b4f68a3a014c3ae62a64def3011ccc43e8c41c9 (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 +++
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