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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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<HTML
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>SDL_JoystickNumButtons</TITLE
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>SDL_JoystickNumButtons</H1
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><H2
>Name</H2
>SDL_JoystickNumButtons&nbsp;--&nbsp;Get the number of joysitck buttons</DIV
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><H2
>Synopsis</H2
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><P
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><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_JoystickNumButtons</B
></CODE
>(SDL_Joystick *joystick);</CODE
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><P
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><H2
>Description</H2
><P
>Return the number of buttons available from a previously opened <SPAN
CLASS="STRUCTNAME"
>SDL_Joystick</SPAN
>.</P
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN6282"
></A
><H2
>Return Value</H2
><P
>Number of buttons.</P
></DIV
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></A
><H2
>See Also</H2
><P
><A
HREF="sdljoystickgetbutton.html"
><TT
CLASS="FUNCTION"
>SDL_JoystickGetButton</TT
></A
>,
<A
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>SDL_JoystickOpen</TT
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