Mercurial > sdl-ios-xcode
view src/audio/mint/SDL_mintaudio.c @ 3978:b966761fef6c SDL-1.2
Significantly improved XIM support.
Fixes Bugzilla #429.
Selected notes from the patch's README:
= FIXES =
This patch fixes the above issues as follows.
== X11 events ==
Moved XFilterEvent just after XNextEvent so that all events are passed
to it. Also, XFilterEvent will receive masks indicated by IM through
XNFilterEvents IC value as well as masks surpplied by SDL.
X11_KeyRepeat is called between XNextEvent and XFilterEvent, after
testing an event is a KeyRelease. I'm not 100% comfortable to do so,
but I couldn't find a better timing to call it, and use of the
function is inevitable.
== Xutf8LookupString ==
Used a longer buffer to receive UTF-8 string. If it is insufficient,
a dynamic storage of the requested size will be allocated. The
initial size of the buffer is set to 32, because the Japanese text
converted from the most widely used benchmark key sequence for
Japanese IM, "WATASHINONAMAEHANAKANODESU." has ten Japanese characters
in it, that occupies 30 bytes when encoded in UTF-8.
== SDL_keysym.unicode ==
On Windows version of SDL implementation, SDL_keysym.unicode stores
UTF-16 encoded unicode characters, one UTF-16 encoding unit per an SDL
event. A Unicode supplementary characters are sent to an application
as two events. (One with a high surrogate and another with a low
surrogate.) The behavior seems reasonable since it is upward
compatible with existing handling of BMP characters.
I wrote a UTF-8 to UTF-16 conversion function for the purpose. It is
designed with the execution speed in mind, having a minimum set of
features that my patch requires.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Mon, 25 Jun 2007 19:58:32 +0000 |
parents | e958a003b69b |
children | a1b03ba2fcd0 |
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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 */ #include "SDL_config.h" /* Audio interrupt variables and callback function Patrice Mandin */ #include <unistd.h> #include <mint/osbind.h> #include <mint/falcon.h> #include <mint/mintbind.h> #include <mint/cookie.h> #include "SDL_audio.h" #include "SDL_mintaudio.h" #include "SDL_mintaudio_stfa.h" /* The audio device */ SDL_AudioDevice *SDL_MintAudio_device; Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */ unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */ volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */ volatile unsigned short SDL_MintAudio_mutex; volatile unsigned long SDL_MintAudio_clocktics; cookie_stfa_t *SDL_MintAudio_stfa; unsigned short SDL_MintAudio_hasfpu; /* MiNT thread variables */ SDL_bool SDL_MintAudio_mint_present; SDL_bool SDL_MintAudio_quit_thread; SDL_bool SDL_MintAudio_thread_finished; long SDL_MintAudio_thread_pid; /* The callback function, called by each driver whenever needed */ void SDL_MintAudio_Callback(void) { Uint8 *buffer; SDL_AudioDevice *audio = SDL_MintAudio_device; buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; SDL_memset(buffer, audio->spec.silence, audio->spec.size); if (audio->paused) return; if (audio->convert.needed) { int silence; if ( audio->convert.src_format == AUDIO_U8 ) { silence = 0x80; } else { silence = 0; } SDL_memset(audio->convert.buf, silence, audio->convert.len); audio->spec.callback(audio->spec.userdata, (Uint8 *)audio->convert.buf,audio->convert.len); SDL_ConvertAudio(&audio->convert); SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt); } else { audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size); } } /* Add a new frequency/clock/predivisor to the current list */ void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock, Uint32 prediv, int gpio_bits) { int i, p; if (MINTAUDIO_freqcount==MINTAUDIO_maxfreqs) { return; } /* Search where to insert the frequency (highest first) */ for (p=0; p<MINTAUDIO_freqcount; p++) { if (frequency > MINTAUDIO_frequencies[p].frequency) { break; } } /* Put all following ones farer */ if (MINTAUDIO_freqcount>0) { for (i=MINTAUDIO_freqcount; i>p; i--) { SDL_memcpy(&MINTAUDIO_frequencies[i], &MINTAUDIO_frequencies[i-1], sizeof(mint_frequency_t)); } } /* And insert new one */ MINTAUDIO_frequencies[p].frequency = frequency; MINTAUDIO_frequencies[p].masterclock = clock; MINTAUDIO_frequencies[p].predivisor = prediv; MINTAUDIO_frequencies[p].gpio_bits = gpio_bits; MINTAUDIO_freqcount++; } /* Search for the nearest frequency */ int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq) { int i; /* Only 1 freq ? */ if (MINTAUDIO_freqcount==1) { return 0; } /* Check the array */ for (i=0; i<MINTAUDIO_freqcount; i++) { if (desired_freq >= ((MINTAUDIO_frequencies[i].frequency+ MINTAUDIO_frequencies[i+1].frequency)>>1)) { return i; } } /* Not in the array, give the latest */ return MINTAUDIO_freqcount-1; } /* Check if FPU is present */ void SDL_MintAudio_CheckFpu(void) { unsigned long cookie_fpu; SDL_MintAudio_hasfpu = 0; if (Getcookie(C__FPU, &cookie_fpu) != C_FOUND) { return; } switch ((cookie_fpu>>16)&0xfffe) { case 2: case 4: case 6: case 8: case 16: SDL_MintAudio_hasfpu = 1; break; } } /* The thread function, used under MiNT with xbios */ int SDL_MintAudio_Thread(long param) { SndBufPtr pointers; SDL_bool buffers_filled[2] = {SDL_FALSE, SDL_FALSE}; SDL_MintAudio_thread_finished = SDL_FALSE; while (!SDL_MintAudio_quit_thread) { if (Buffptr(&pointers)!=0) continue; if (( (unsigned long)pointers.play>=(unsigned long)SDL_MintAudio_audiobuf[0]) && ( (unsigned long)pointers.play<=(unsigned long)SDL_MintAudio_audiobuf[1])) { /* DMA is reading buffer #0, setup buffer #1 if not already done */ if (!buffers_filled[1]) { SDL_MintAudio_numbuf = 1; SDL_MintAudio_Callback(); Setbuffer(0, SDL_MintAudio_audiobuf[1], SDL_MintAudio_audiobuf[1] + SDL_MintAudio_audiosize); buffers_filled[1]=SDL_TRUE; buffers_filled[0]=SDL_FALSE; } } else { /* DMA is reading buffer #1, setup buffer #0 if not already done */ if (!buffers_filled[0]) { SDL_MintAudio_numbuf = 0; SDL_MintAudio_Callback(); Setbuffer(0, SDL_MintAudio_audiobuf[0], SDL_MintAudio_audiobuf[0] + SDL_MintAudio_audiosize); buffers_filled[0]=SDL_TRUE; buffers_filled[1]=SDL_FALSE; } } usleep(100); } SDL_MintAudio_thread_finished = SDL_TRUE; return 0; } void SDL_MintAudio_WaitThread(void) { if (!SDL_MintAudio_mint_present) return; if (SDL_MintAudio_thread_finished) return; SDL_MintAudio_quit_thread = SDL_TRUE; while (!SDL_MintAudio_thread_finished) { Syield(); } }