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;

.TH "SDL_PollEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference" +
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.SH "NAME"+
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SDL_PollEvent\- Polls for currently pending events\&.+
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.SH "SYNOPSIS"+
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.PP+
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\fB#include "SDL\&.h"+
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.sp+
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\fBint \fBSDL_PollEvent\fP\fR(\fBSDL_Event *event\fR);+
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.SH "DESCRIPTION"+
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.PP+
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Polls for currently pending events, and returns \fB1\fR if there are any pending events, or \fB0\fR if there are none available\&. +
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.PP+
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If \fBevent\fR is not \fBNULL\fP, the next event is removed from the queue and stored in that area\&.+
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.SH "EXAMPLES"+
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.PP+
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.PP+
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.nf+
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\f(CWSDL_Event event; /* Event structure */+
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+
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\&.+
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\&.+
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\&.+
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/* Check for events */+
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while(SDL_PollEvent(&event)){  /* Loop until there are no events left on the queue */+
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  switch(event\&.type){  /* Process the appropiate event type */+
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    case SDL_KEYDOWN:  /* Handle a KEYDOWN event */         +
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      printf("Oh! Key press+
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");+
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      break;+
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    case SDL_MOUSEMOTION:+
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      \&.+
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      \&.+
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      \&.+
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    default: /* Report an unhandled event */+
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      printf("I don\&'t know what this event is!+
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");+
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  }+
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}\fR+
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.fi+
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.PP+
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.SH "SEE ALSO"+
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.PP+
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\fI\fBSDL_Event\fR\fR, \fI\fBSDL_WaitEvent\fP\fR, \fI\fBSDL_PeepEvents\fP\fR+
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59+
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