Mercurial > sdl-ios-xcode
view src/video/dga/SDL_dgavideo.h @ 968:4675910b0b7b
Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
From: Hannu Savolainen
Subject: Re: SDL uses obsolete OSS features
I did some work on getting OSS to work better with SDL. There have been
some problems with select which should be fixed now.
I'm having some problems in understanding what is the purpose of the
DSP_WaitAudio() routine. I added a return to the very beginning of this
routine and commendted out the define for USE_BLOCKING_WRITES. At least
lbreakout2 seems to work as well as earlier. The latencies are the same.
An ordinary blocking write does exactly the same thing than DSP_WaitAudio
does. So I would recommend using the USE_BLOCKING_WRITES approach and
removing everything from the DSP_WaitAudio routine. Also enabling
USE_BLOCKING_WRITES makes it possible to simplify DSP_PlayAudio() because
you don't need to handle the partial writes (the do-while loop).
Attached is a patch against SDL-1.2.7. After these changes SDL will use
OSS as it's designed to be used (make it as simple as possible). This code
should work with all OSS implementations because it uses only the very
fundamental features that have been there since the jurassic times.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 12 Nov 2004 21:39:04 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif #ifndef _SDL_dgavideo_h #define _SDL_dgavideo_h #include <X11/Xlib.h> #include "SDL_mouse.h" #include "SDL_mutex.h" #include "SDL_sysvideo.h" /* Hidden "this" pointer for the video functions */ #define _THIS SDL_VideoDevice *this /* Define this if you need the DGA driver to be thread-safe */ #define LOCK_DGA_DISPLAY #ifdef LOCK_DGA_DISPLAY #define LOCK_DISPLAY() SDL_mutexP(event_lock) #define UNLOCK_DISPLAY() SDL_mutexV(event_lock) #else #define LOCK_DISPLAY() #define UNLOCK_DISPLAY() #endif /* This is the structure we use to keep track of video memory */ typedef struct vidmem_bucket { struct vidmem_bucket *prev; int used; int dirty; Uint8 *base; unsigned int size; struct vidmem_bucket *next; } vidmem_bucket; /* Private display data */ struct SDL_PrivateVideoData { Display *DGA_Display; Colormap DGA_colormap; int visualClass; #define NUM_MODELISTS 4 /* 8, 16, 24, and 32 bits-per-pixel */ int SDL_nummodes[NUM_MODELISTS]; SDL_Rect **SDL_modelist[NUM_MODELISTS]; /* Information for the video surface */ Uint8 *memory_base; int memory_pitch; SDL_mutex *hw_lock; int sync_needed; int was_flipped; /* Information for hardware surfaces */ vidmem_bucket surfaces; int surfaces_memtotal; int surfaces_memleft; /* Information for double-buffering */ int flip_page; int flip_yoffset[2]; Uint8 *flip_address[2]; /* Used to handle DGA events */ int event_base; #ifdef LOCK_DGA_DISPLAY SDL_mutex *event_lock; #endif }; /* Old variable names */ #define DGA_Display (this->hidden->DGA_Display) #define DGA_Screen DefaultScreen(DGA_Display) #define DGA_colormap (this->hidden->DGA_colormap) #define DGA_visualClass (this->hidden->visualClass) #define memory_base (this->hidden->memory_base) #define memory_pitch (this->hidden->memory_pitch) #define flip_page (this->hidden->flip_page) #define flip_yoffset (this->hidden->flip_yoffset) #define flip_address (this->hidden->flip_address) #define sync_needed (this->hidden->sync_needed) #define was_flipped (this->hidden->was_flipped) #define SDL_nummodes (this->hidden->SDL_nummodes) #define SDL_modelist (this->hidden->SDL_modelist) #define surfaces (this->hidden->surfaces) #define surfaces_memtotal (this->hidden->surfaces_memtotal) #define surfaces_memleft (this->hidden->surfaces_memleft) #define hw_lock (this->hidden->hw_lock) #define DGA_event_base (this->hidden->event_base) #define event_lock (this->hidden->event_lock) #endif /* _SDL_dgavideo_h */