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Fixed bug #33 Mike Frysinger wrote: > with libsdl-1.2.9, some games (like bomberclone) started > segfaulting in Gentoo [...snip...] > the last change in the last hunk: [...snip...] > if i change the statement to read: > (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures() > bomberclone no longer segfaults on my box Alex Volkov wrote: > The test "(table[which].blit_features & GetBlitFeatures()) == > table[which].blit_features)" is correct, and the previous > "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken. I think there is potentially a slightly different cause of the above problem. During the introduction of the Altivec code, the blit_table struct field 'alpha' got changed from a straightforward enum to a bitmask, which makes perfect sense by itself. However, now the table driven blitter selection code in SDL_CalculateBlitN() can choose the wrong blitters when searching for a NO_ALPHA blitter because of the following code: int a_need = 0; ... (a_need & table[which].alpha) == a_need && When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing alpha channel bits to appear in a non-alpha destination surface. I suppose this could theoretically be an indirect cause of the segfault mentioned above. I *think* this can be fixed by changing to int a_need = NO_ALPHA;
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:47:49 +0000
parents 355632dca928
children
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>SDL Event Structures.</H1
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><DT
><A
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>SDL_Event</A
>&nbsp;--&nbsp;General event structure</DT
><DT
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>SDL_ActiveEvent</A
>&nbsp;--&nbsp;Application visibility event structure</DT
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>SDL_KeyboardEvent</A
>&nbsp;--&nbsp;Keyboard event structure</DT
><DT
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>SDL_MouseMotionEvent</A
>&nbsp;--&nbsp;Mouse motion event structure</DT
><DT
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>SDL_MouseButtonEvent</A
>&nbsp;--&nbsp;Mouse button event structure</DT
><DT
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>SDL_JoyAxisEvent</A
>&nbsp;--&nbsp;Joystick axis motion event structure</DT
><DT
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>SDL_JoyButtonEvent</A
>&nbsp;--&nbsp;Joystick button event structure</DT
><DT
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>SDL_JoyHatEvent</A
>&nbsp;--&nbsp;Joystick hat position change event structure</DT
><DT
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>SDL_JoyBallEvent</A
>&nbsp;--&nbsp;Joystick trackball motion event structure</DT
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>SDL_ResizeEvent</A
>&nbsp;--&nbsp;Window resize event structure</DT
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>SDL_ExposeEvent</A
>&nbsp;--&nbsp;Quit requested event</DT
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>SDL_SysWMEvent</A
>&nbsp;--&nbsp;Platform-dependent window manager event.</DT
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>SDL_UserEvent</A
>&nbsp;--&nbsp;A user-defined event type</DT
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>SDL_QuitEvent</A
>&nbsp;--&nbsp;Quit requested event</DT
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>SDL_keysym</A
>&nbsp;--&nbsp;Keysym structure</DT
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>&nbsp;--&nbsp;Keysym definitions.</DT
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