Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_CreateRGBSurface.3 @ 914:bbf8dcc8aed6
Date: Wed, 23 Jun 2004 17:05:33 -0400
From: Chris Nelson
Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick)
In the current cvs version, SDL doesn't handle these Playstation2
controller => USB adapters correctly, in linux.
It will always assume that the maximum number of joysticks (2 in the
case of the MP-8866, 4 in the case of the 8800) are plugged in. This is
bad not only because it allows SDL to exaggerate the number of logical
joysticks, but primarily because the joystick axes are mapped
incorrectly, all over the place, such that the devices are effectively
unusable unless you have the maximum number of joysticks plugged in.
My changes to src/joystick/linux/SDL_sysjoystick.c build on another's
previous work (which was a special case for this very joystick,
actually), and fix both of these problems, as well as making the current
code a little more general, to allow for others to more easily drop in
code for quirky joysticks such as these.
I've tested this code under 2.6.7 as well as 2.4.24... Both work as
advertised (provided you load the JOYDEV linux code as a module,
otherwise they won't work at all, new code or old, but that's another
issue entirely).
Though this sounds horribly formal, you have my permission to distribute
all of my work on this issue under the LGPL. So there.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 25 Jul 2004 18:31:50 +0000 |
parents | e5bc29de3f0a |
children | 546f7c1eb755 |
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1 .TH "SDL_CreateRGBSurface" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
0 | 2 .SH "NAME" |
3 SDL_CreateRGBSurface\- Create an empty SDL_Surface | |
4 .SH "SYNOPSIS" | |
5 .PP | |
6 \fB#include "SDL\&.h" | |
7 .sp | |
8 \fBSDL_Surface *\fBSDL_CreateRGBSurface\fP\fR(\fBUint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask\fR); | |
9 .SH "DESCRIPTION" | |
10 .PP | |
11 Allocate an empty surface (must be called after \fISDL_SetVideoMode\fR) | |
12 .PP | |
13 If \fBdepth\fR is 8 bits an empty palette is allocated for the surface, otherwise a \&'packed-pixel\&' \fI\fBSDL_PixelFormat\fR\fR is created using the \fB[RGBA]mask\fR\&'s provided (see \fI\fBSDL_PixelFormat\fR\fR)\&. The \fBflags\fR specifies the type of surface that should be created, it is an OR\&'d combination of the following possible values\&. | |
14 .TP 20 | |
15 \fBSDL_SWSURFACE\fP | |
16 SDL will create the surface in system memory\&. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting\&. | |
17 .TP 20 | |
18 \fBSDL_HWSURFACE\fP | |
19 SDL will attempt to create the surface in video memory\&. This will allow SDL to take advantage of Video->Video blits (which are often accelerated)\&. | |
20 .TP 20 | |
21 \fBSDL_SRCCOLORKEY\fP | |
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22 This flag turns on colourkeying for blits from this surface\&. If \fBSDL_HWSURFACE\fP is also specified and colourkeyed blits are hardware-accelerated, then SDL will attempt to place the surface in video memory\&. Use \fI\fBSDL_SetColorKey\fP\fR to set or clear this flag after surface creation\&. |
0 | 23 .TP 20 |
24 \fBSDL_SRCALPHA\fP | |
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25 This flag turns on alpha-blending for blits from this surface\&. If \fBSDL_HWSURFACE\fP is also specified and alpha-blending blits are hardware-accelerated, then the surface will be placed in video memory if possible\&. Use \fI\fBSDL_SetAlpha\fP\fR to set or clear this flag after surface creation\&. |
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26 .PP |
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27 .RS |
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28 \fBNote: |
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29 .PP |
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30 If an alpha-channel is specified (that is, if \fBAmask\fR is nonzero), then the \fBSDL_SRCALPHA\fP flag is automatically set\&. You may remove this flag by calling \fI\fBSDL_SetAlpha\fP\fR after surface creation\&. |
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31 .RE |
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32 .SH "RETURN VALUE" |
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33 .PP |
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34 Returns the created surface, or \fBNULL\fR upon error\&. |
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35 .SH "EXAMPLE" |
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36 .PP |
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37 .nf |
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38 \f(CW /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order, |
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39 as expected by OpenGL for textures */ |
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40 SDL_Surface *surface; |
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41 Uint32 rmask, gmask, bmask, amask; |
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42 |
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43 /* SDL interprets each pixel as a 32-bit number, so our masks must depend |
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44 on the endianness (byte order) of the machine */ |
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45 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
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46 rmask = 0xff000000; |
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47 gmask = 0x00ff0000; |
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48 bmask = 0x0000ff00; |
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49 amask = 0x000000ff; |
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50 #else |
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51 rmask = 0x000000ff; |
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52 gmask = 0x0000ff00; |
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53 bmask = 0x00ff0000; |
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54 amask = 0xff000000; |
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55 #endif |
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56 |
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57 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32, |
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58 rmask, gmask, bmask, amask); |
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59 if(surface == NULL) { |
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60 fprintf(stderr, "CreateRGBSurface failed: %s |
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61 ", SDL_GetError()); |
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62 exit(1); |
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63 }\fR |
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64 .fi |
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65 .PP |
0 | 66 .SH "SEE ALSO" |
67 .PP | |
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68 \fI\fBSDL_CreateRGBSurfaceFrom\fP\fR, \fI\fBSDL_FreeSurface\fP\fR, \fI\fBSDL_SetVideoMode\fP\fR, \fI\fBSDL_LockSurface\fP\fR, \fI\fBSDL_PixelFormat\fR\fR, \fI\fBSDL_Surface\fR\fR \fI\fBSDL_SetAlpha\fP\fR \fI\fBSDL_SetColorKey\fP\fR |
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69 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |