Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_VideoModeOK.3 @ 1240:3b8a43c428bb
From Bug #36:
There are a couple of issues with the selection of Altivec alpha-blitting
routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c.
1) There's no check for the presence of Altivec when checking if the
Blit32to565PixelAlphaAltivec() routine can be selected.
2) Altivec cannot be used in video memory, and there's no check if the
destination surface is a hardware surface. (Alpha-blitting to a hardware
surface with GPU support is a bad idea, but somebody's bound to do it anyway.)
Patch to fix these attached.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 08 Jan 2006 21:18:15 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
| rev | line source |
|---|---|
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_VideoModeOK" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
| 3 SDL_VideoModeOK\- Check to see if a particular video mode is supported\&. | |
| 4 .SH "SYNOPSIS" | |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
| 8 \fBint \fBSDL_VideoModeOK\fP\fR(\fBint width, int height, int bpp, Uint32 flags\fR); | |
| 9 .SH "DESCRIPTION" | |
| 10 .PP | |
| 11 \fBSDL_VideoModeOK\fP returns \fB0\fR if the requested mode is not supported under any bit depth, or returns the bits-per-pixel of the closest available mode with the given width, height and requested \fIsurface\fR flags (see \fI\fBSDL_SetVideoMode\fP\fR)\&. | |
| 12 .PP | |
| 13 The bits-per-pixel value returned is only a suggested mode\&. You can usually request and bpp you want when \fIsetting\fR the video mode and SDL will emulate that color depth with a shadow video surface\&. | |
| 14 .PP | |
| 15 The arguments to \fBSDL_VideoModeOK\fP are the same ones you would pass to \fISDL_SetVideoMode\fR | |
| 16 .SH "EXAMPLE" | |
| 17 .PP | |
| 18 .nf | |
| 19 \f(CWSDL_Surface *screen; | |
| 20 Uint32 bpp; | |
| 21 \&. | |
| 22 \&. | |
| 23 \&. | |
| 24 printf("Checking mode 640x480@16bpp\&. | |
| 25 "); | |
| 26 bpp=SDL_VideoModeOK(640, 480, 16, SDL_HWSURFACE); | |
| 27 | |
| 28 if(!bpp){ | |
| 29 printf("Mode not available\&. | |
| 30 "); | |
| 31 exit(-1); | |
| 32 } | |
| 33 | |
| 34 printf("SDL Recommends 640x480@%dbpp\&. | |
| 35 ", bpp); | |
| 36 screen=SDL_SetVideoMode(640, 480, bpp, SDL_HWSURFACE); | |
| 37 \&. | |
| 38 \&.\fR | |
| 39 .fi | |
| 40 .PP | |
| 41 .SH "SEE ALSO" | |
| 42 .PP | |
| 43 \fI\fBSDL_SetVideoMode\fP\fR, \fI\fBSDL_GetVideoInfo\fP\fR | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
44 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |