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This patch deactivates accelerated graphics driver functions and also the double

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screen height trick for using double buffering with an offscreen half of the
frame buffer. Whenever I run app_server without this patch, it frequently
locks up in weird ways. Additionally, app_server uses less CPU for many graphics
operations, notably the ones that require any blending, ie reading frame buffer.
This should be even more noticable for slow computers. The only draw back is that
slow computers may suffer a bit when just dragging a window, since that is
now performed on the CPU. However, I have high doubts that the benefits don't
outweight the drawbacks, and the feedback I have received indicates that as well.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30278 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Stephan Aßmus 2009-04-20 12:01:06 +00:00
parent 3b63cb8a3a
commit b40fb3c7b9
1 changed files with 10 additions and 1 deletions
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11
src/servers/app/drawing/AccelerantHWInterface.cpp
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@ -508,7 +508,7 @@ AccelerantHWInterface::SetMode(const display_mode& mode)
bool tryOffscreenBackBuffer = false;
fOffscreenBackBuffer = false;
#if 1
#if 0
if (fVGADevice < 0 && (color_space)newMode.space == B_RGB32) {
// we should have an accelerated graphics driver, try
// to allocate a frame buffer large enough to contain
@ -594,12 +594,18 @@ AccelerantHWInterface::SetMode(const display_mode& mode)
#endif
// update acceleration hooks
#if 0
fAccFillRect = (fill_rectangle)fAccelerantHook(B_FILL_RECTANGLE,
(void *)&fDisplayMode);
fAccInvertRect = (invert_rectangle)fAccelerantHook(B_INVERT_RECTANGLE,
(void *)&fDisplayMode);
fAccScreenBlit = (screen_to_screen_blit)fAccelerantHook(
B_SCREEN_TO_SCREEN_BLIT, (void *)&fDisplayMode);
#else
fAccFillRect = NULL;
fAccInvertRect = NULL;
fAccScreenBlit = NULL;
#endif
// in case there is no accelerated blit function, using
// an offscreen located backbuffer will not be beneficial!
@ -627,6 +633,9 @@ AccelerantHWInterface::SetMode(const display_mode& mode)
&& fFrontBuffer->ColorSpace() != B_RGBA32)
|| fVGADevice >= 0 || fOffscreenBackBuffer)
doubleBuffered = true;
#if 1
doubleBuffered = true;
#endif
if (doubleBuffered) {
if (fOffscreenBackBuffer) {