Mercurial > sdl-ios-xcode
view src/audio/mint/SDL_mintaudio_it.S @ 4167:a6f635e5eaa6 SDL-1.2
Fixed bug #611
From Tim Angus 2008-08-12 11:18:06
I'm one of the maintainers of ioquake3.org, an updated version of the
Quake 3 engine. Relatively recently, we moved ioq3 to use SDL as a
replacement for 95% of the platform specific code that was there. On the
whole it's doing a great job but unfortunately since the move we've been
getting complaints about the quality of the mouse input on the Windows
platform to the point where for many the game is unplayable. Put in
other terms, the current stable SDL 1.2 is basically not fit for purpose
if you need high quality mouse input as you do in a first person shooter.
Over the weekend I decided to pull my finger out and actually figure out
what's going on. There are basically two major problems. Firstly, when
using the "windib" driver, mouse input is gathered via the WM_MOUSEMOVE
message. Googling for this indicates that often this is known to result
in "spurious" and/or "missing" mouse movement events; this is the
primary cause of the poor mouse input. The second problem is that the
"directx" driver does not work at all in combination with OpenGL meaning
that you can't use DirectInput if your application also uses OpenGL. In
other words you're locked into using the "windib" driver and its poor
mouse input.
In order to address these problems I've done the following:
* Remove WM_MOUSEMOVE based motion event generation and replace with
calls to GetCursorPos which seems much more reliable. In order to
achieve this I've moved mouse motion out into a separate function that
is called once per DIB_PumpEvents.
* Remove the restriction on the "directx" driver being inoperable in
combination with OpenGL. There is a bug for this issues that I've
hijacked to a certain extent
(http://bugzilla.libsdl.org/show_bug.cgi?id=265). I'm the first to admit
I don't really understand why this restriction is there in the first
place. The commit message for the bug fix that introduced this
restriction (r581) isn't very elaborate and I couldn't see any other bug
tracking the issue. If anyone has more information on the bug that was
avoided by r581 it would be helpful as I/someone could then look into
addressing the problem without disabling the "directx" driver.
* I've also removed the restriction on not being allowed to use
DirectInput in windowed mode. I couldn't see any reason for this, at
least not from our perspective. I have my suspicions that it'll be
something like matching up the cursor with the mouse coordinates...
* I bumped up the DirectInput API used to version 7 in order to get
access to mouse buttons 4-7. I've had to inject a little bit of the DX7
headers into SDL there as the MinGW ones aren't up to date in this respect.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 02 Apr 2009 04:43:36 +0000 |
| parents | a1b03ba2fcd0 |
| children | 66aea42c3541 |
line wrap: on
line source
/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 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 */ /* Audio interrupts Patrice Mandin, Didier Méquignon */ .text .globl _SDL_MintAudio_Callback .globl _SDL_MintAudio_XbiosInterrupt .globl _SDL_MintAudio_XbiosInterruptMeasureClock .globl _SDL_MintAudio_Dma8Interrupt .globl _SDL_MintAudio_StfaInterrupt .globl _SDL_MintAudio_mutex .globl _SDL_MintAudio_audiobuf .globl _SDL_MintAudio_numbuf .globl _SDL_MintAudio_audiosize .globl _SDL_MintAudio_clocktics .globl _SDL_MintAudio_hasfpu .globl _SDL_MintAudio_stfa /* How it works: - Audio is playing buffer #0 (resp. #1) - We must calculate a sample in buffer #1 (resp. #0) so we first call the callback to do it - Then we swap the buffers */ #define savptr 0x4a2 #define savamt 0x46 /*--- Xbios interrupt vector to measure Falcon external clock ---*/ _SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */ btst #0,0xFFFF8901:w /* state DMA sound */ beqs SDL_MintAudio_EndIntMeasure addql #1,_SDL_MintAudio_clocktics SDL_MintAudio_EndIntMeasure: bclr #5,0xFFFFFA0F:w /* Clear service bit */ rte /*--- Xbios interrupt vector ---*/ _SDL_MintAudio_XbiosInterrupt: /* Reenable interrupts, so other interrupts can work */ movew #0x2300,sr /* Clear service bit, so other MFP interrupts can work */ bclr #5,0xfffffa0f:w /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bne SDL_MintAudio_XbiosEnd notw _SDL_MintAudio_mutex /* Swap buffers */ eorw #1,_SDL_MintAudio_numbuf moveml d0-d7/a0-a6,sp@- /* Save FPU if needed */ tstw _SDL_MintAudio_hasfpu beqs SDL_MintAudio_Xbios_nofpu1 .chip 68060 fsave sp@- fmoveml fpcr/fpsr/fpiar,sp@- fmovemx fp0-fp7,sp@- .chip 68000 SDL_MintAudio_Xbios_nofpu1: /* Callback */ jsr _SDL_MintAudio_Callback /* Restore FPU if needed */ tstw _SDL_MintAudio_hasfpu beqs SDL_MintAudio_Xbios_nofpu2 .chip 68060 fmovemx sp@+,fp0-fp7 fmoveml sp@+,fpcr/fpsr/fpiar frestore sp@+ .chip 68000 SDL_MintAudio_Xbios_nofpu2: /* Reserve space for registers */ subl #savamt,savptr /* Set new buffer */ moveq #0,d0 movel _SDL_MintAudio_audiosize,d1 movew _SDL_MintAudio_numbuf,d0 lsll #2,d0 lea _SDL_MintAudio_audiobuf,a0 movel a0@(d0:l),a1 lea a1@(d1:l),a2 movel a2,sp@- movel a1,sp@- clrw sp@- movew #131,sp@- trap #14 lea sp@(12),sp /* Restore registers space */ addl #savamt,savptr moveml sp@+,d0-d7/a0-a6 clrw _SDL_MintAudio_mutex SDL_MintAudio_XbiosEnd: rte /*--- DMA 8 bits interrupt vector ---*/ _SDL_MintAudio_Dma8Interrupt: /* Reenable interrupts, so other interrupts can work */ movew #0x2300,sr /* Clear service bit, so other MFP interrupts can work */ bclr #5,0xfffffa0f:w /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bne SDL_MintAudio_Dma8End notw _SDL_MintAudio_mutex /* Swap buffers */ eorw #1,_SDL_MintAudio_numbuf moveml d0-d1/a0-a1,sp@- /* Save FPU if needed */ tstw _SDL_MintAudio_hasfpu beqs SDL_MintAudio_Dma8_nofpu1 .chip 68060 fsave sp@- fmoveml fpcr/fpsr/fpiar,sp@- fmovemx fp0-fp7,sp@- .chip 68000 SDL_MintAudio_Dma8_nofpu1: /* Callback */ jsr _SDL_MintAudio_Callback /* Restore FPU if needed */ tstw _SDL_MintAudio_hasfpu beqs SDL_MintAudio_Dma8_nofpu2 .chip 68060 fmovemx sp@+,fp0-fp7 fmoveml sp@+,fpcr/fpsr/fpiar frestore sp@+ .chip 68000 SDL_MintAudio_Dma8_nofpu2: /* Set new buffer */ moveq #0,d0 movew _SDL_MintAudio_numbuf,d0 lslw #2,d0 lea _SDL_MintAudio_audiobuf,a0 movel a0@(d0:w),d1 /* Modify DMA addresses */ lea 0xffff8900:w,a0 moveb d1,a0@(0x07) /* Start address */ rorl #8,d1 moveb d1,a0@(0x05) rorl #8,d1 moveb d1,a0@(0x03) swap d1 addl _SDL_MintAudio_audiosize,d1 moveb d1,a0@(0x13) /* End address */ rorl #8,d1 moveb d1,a0@(0x11) rorl #8,d1 moveb d1,a0@(0x0f) moveml sp@+,d0-d1/a0-a1 clrw _SDL_MintAudio_mutex SDL_MintAudio_Dma8End: rte /*--- STFA interrupt vector ---*/ STFA_SOUND_START = 6 STFA_SOUND_END = STFA_SOUND_START+8 _SDL_MintAudio_StfaInterrupt: /* Reenable interrupts, so other interrupts can work */ movew #0x2300,sr /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bnes SDL_MintAudio_StfaEnd notw _SDL_MintAudio_mutex /* Swap buffers */ eorw #1,_SDL_MintAudio_numbuf moveml d0-d7/a0-a6,sp@- /* Save FPU if needed */ tstw _SDL_MintAudio_hasfpu beqs SDL_MintAudio_Stfa_nofpu1 .chip 68060 fsave sp@- fmoveml fpcr/fpsr/fpiar,sp@- fmovemx fp0-fp7,sp@- .chip 68000 SDL_MintAudio_Stfa_nofpu1: /* Callback */ jsr _SDL_MintAudio_Callback /* Restore FPU if needed */ tstw _SDL_MintAudio_hasfpu beqs SDL_MintAudio_Stfa_nofpu2 .chip 68060 fmovemx sp@+,fp0-fp7 fmoveml sp@+,fpcr/fpsr/fpiar frestore sp@+ .chip 68000 SDL_MintAudio_Stfa_nofpu2: /* Set new buffer */ moveq #0,d0 movel _SDL_MintAudio_stfa,a1 movew _SDL_MintAudio_numbuf,d0 lslw #2,d0 lea _SDL_MintAudio_audiobuf,a0 movel a0@(d0:w),d1 /* Modify STFA replay buffers */ movel d1,a1@(STFA_SOUND_START) addl _SDL_MintAudio_audiosize,d1 movel d1,a1@(STFA_SOUND_END) moveml sp@+,d0-d7/a0-a6 clrw _SDL_MintAudio_mutex SDL_MintAudio_StfaEnd: rte