view docs/man3/SDL_SetModState.3 @ 1544:ab1e4c41ab71

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 (2006-03-15)
parents e5bc29de3f0a
children 546f7c1eb755
line wrap: on
line source
.TH "SDL_SetModState" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_SetModState\- Set the current key modifier state
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBvoid \fBSDL_SetModState\fP\fR(\fBSDLMod modstate\fR);
.SH "DESCRIPTION"
.PP
The inverse of \fI\fBSDL_GetModState\fP\fR, \fBSDL_SetModState\fP allows you to impose modifier key states on your application\&.
.PP
Simply pass your desired modifier states into \fBmodstate\fR\&. This value my be a logical OR\&'d combination of the following:
.PP
.nf
\f(CWtypedef enum {
  KMOD_NONE  = 0x0000,
  KMOD_LSHIFT= 0x0001,
  KMOD_RSHIFT= 0x0002,
  KMOD_LCTRL = 0x0040,
  KMOD_RCTRL = 0x0080,
  KMOD_LALT  = 0x0100,
  KMOD_RALT  = 0x0200,
  KMOD_LMETA = 0x0400,
  KMOD_RMETA = 0x0800,
  KMOD_NUM   = 0x1000,
  KMOD_CAPS  = 0x2000,
  KMOD_MODE  = 0x4000,
} SDLMod;\fR
.fi
.PP
.SH "SEE ALSO"
.PP
\fI\fBSDL_GetModState\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00