Mercurial > sdl-ios-xcode
view src/audio/mint/SDL_mintaudio_it.S @ 1012:f14e3059e138
Date: Mon, 13 Dec 2004 21:28:18 -0500
From: Jonathan Atkins
Subject: [SDL] SDL_SaveBMP width bugfix
this fixes the pitch versus width difference that can happen
(especially for 8bit and 24bit (with the exact RGBAmasks) surfaces)
when you use SDL_SaveBMP. The problem was the pitch was used
instead of the width, which in some cases is much wider than the
screen area you really want to save...making for ugly crud on the
saved image borders.
This code has been tested with & without pitch overhangs...and
with the right masks for 24 bit surfaces.
I tested 8,15,16,24,32-0RGB,32-RGBA(with no SDL_SRCALPHA flag).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 14 Dec 2004 06:20:49 +0000 |
| parents | 185acc07127a |
| children | d00b4d8508ab |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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_GsxbInterrupt .globl _SDL_MintAudio_EmptyGsxbInterrupt .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_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 */ /*--- GSXB interrupt vector ---*/ .text _SDL_MintAudio_GsxbInterrupt: /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bnes _SDL_MintAudio_EmptyGsxbInterrupt notw _SDL_MintAudio_mutex /* Swap buffers */ eorw #1,_SDL_MintAudio_numbuf moveml d0-d2/a0-a2,sp@- /* Callback */ jsr _SDL_MintAudio_Callback /* 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 moveml sp@+,d0-d2/a0-a2 clrw _SDL_MintAudio_mutex _SDL_MintAudio_EmptyGsxbInterrupt: rts /*--- 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 bnes SDL_MintAudio_XbiosEnd notw _SDL_MintAudio_mutex /* Swap buffers */ eorw #1,_SDL_MintAudio_numbuf moveml d0-d2/a0-a2,sp@- /* Callback */ jsr _SDL_MintAudio_Callback /* 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 moveml sp@+,d0-d2/a0-a2 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 bnes SDL_MintAudio_Dma8End notw _SDL_MintAudio_mutex /* Swap buffers */ eorw #1,_SDL_MintAudio_numbuf moveml d0-d1/a0-a1,sp@- /* Callback */ jsr _SDL_MintAudio_Callback /* 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-d1/a0-a1,sp@- /* Callback */ jsr _SDL_MintAudio_Callback /* 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-d1/a0-a1 clrw _SDL_MintAudio_mutex SDL_MintAudio_StfaEnd: rte