7bc1f1285e
This moves us to always rendering to an off-screen texture, and then
(at idle) blitting this to the screen & swapping buffers. Ideally we
should never see any rendering, or flicker again with this approach.
Several fixes are included:
+ avoid multiple OpenGL contexts being created for the same window,
created excessive flicker problems.
+ de-virtualize UseContext - which context we use is less critical.
+ kill 'mbOffscreen' distinction - all VCL rendering is offscreen.
+ implement 'doFlush' and high priority idle flushing.
+ bind stencil buffer for clipping vs. textures - fixing complex
clopping when rendering to virtual-devices, and off-screen.
+ document environment. variables.
+ use white as default background glClear color, but red or
random color for DBGUTIL.
Change-Id: I6be08595b6c8deb7e6db0dbd81308b2c97d2b4ff
28 lines
1.1 KiB
Text
28 lines
1.1 KiB
Text
Environment variables in VCL:
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General
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SAL_USE_VCLPLUGIN - use a VCL plugin
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SAL_NO_NWF - disable native widgets
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SAL_FORCEDPI - force a specific DPI (gtk & gtk3 plugins only)
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SAL_FORCE_HC - force high-contrast mode
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VCL_DOUBLEBUFFERING_AVOID_PAINT - don't paint the buffer, useful to see where we do direct painting
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VCL_DOUBLEBUFFERING_FORCE_ENABLE - enable double buffered painting
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VCL_DOUBLEBUFFERING_ENABLE - enable a safe subset of double buffered painting (currently in Writer, not in any other applications)
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VCL_HIDE_WINDOWS - don't draw windows
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Bitmap
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VCL_NO_THREAD_SCALE - disable threaded bitmap scale
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EMF_PLUS_DISABLE - use EMF rendering and ignore EMF+ specifics
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OpenGL
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SAL_FORCEGL - force enable OpenGL
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SAL_GL_NO_SWAP - disable buffer swapping if set (should show nothing)
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SAL_GL_SLEEP_ON_SWAP - sleep for half a second on each swap-buffers.
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SAL_WITHOUT_WIDGET_CACHE - disable LRU caching of native widget texutres
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SAL_DISABLE_GLYPH_CACHING - don't render glyphs through OpenGL textures
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SAL_DISABLE_GL_WATCHDOG - don't start the thread that watches for broken GL drivers
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