void enableAudioPlayback(void) {
static bool _firstRun = true;
OSystem_N64 *osys = (OSystem_N64 *)g_system;
Audio::MixerImpl *localmixer = (Audio::MixerImpl *)osys->getMixer();
uint32 sampleBufferSize = 3072;
initAudioInterface(osys->_viClockRate, DEFAULT_SOUND_SAMPLE_RATE, 16, sampleBufferSize);
osys->_audioBufferSize = getAIBufferSize();
if (_firstRun) {
localmixer->setReady(true);
_firstRun = false;
}
disable_interrupts();
_audioEnabled = true;
sndCallback();
sndCallback();
registerAIhandler(sndCallback); // Lib checks if i try to register it multiple times
enable_interrupts();
}
// execution begins here
int UltraMain(void) {
struct display_context * dc;
struct controller_data cd;
int lasty=0,lastx=0;
int d=0;
// buffer for rendering text strings (only sprintf works at the moment)
char buf[1024];
// offset for the scrolling waveform
float offs=0;
// used to keep track of how many cycles various processes take
unsigned long time,rendertime,lastrendertime,waittime,lastwaittime;
// enable MI interrupts (on the CPU)
set_MI_interrupt(1);
initDisplay();
initAudio();
registerAIhandler(AIcallback);
registerVIhandler(VIcallback);
while (1) {
short * sb;
int sbsize;
// Mark the value of the COUNT register (increments at half the CPU
// rate) at the start of the main loop.
time=read_count();
while (! (dc=lockDisplay())) ;
// Mark the time after waiting.
waittime=time;
waittime=((time=read_count())-waittime)*2;
sb=getbuf();
sbsize=getbufsize();
for (int c=0;c<sbsize;c++,d++) {
sb[c*2]=sin((d%22050)/22050.0*M_TWOPI*1000.0)*100*((cd.c[0].y-lasty)*c/sbsize+lasty)*(((cd.c[0].x-lastx)*c/sbsize+lastx)/128.0-1.0);
sb[c*2+1]=sin((d%22050)/22050.0*M_TWOPI*1000.0)*100*((cd.c[0].y-lasty)*c/sbsize+lasty)*(((cd.c[0].x-lastx)*c/sbsize+lastx)/128.0+1.0);
}
writebuffer(sb);
lastx=cd.c[0].x;
lasty=cd.c[0].y;
// this is what really marks the beginning of the current frame
// read controller data
controller_Read(&cd);
// start drawing on the other frame buffer, clear the screen (uses red
// when the start button on controller 1 is pressed, black otherwise)
VI_FillScreen(&dc->conf,cd.c[0].err?0:(cd.c[0].start?0xf800:0));
// print a little info for each controller
for (int c=0; c < 4; c++) {
if (cd.c[c].err) // if controller not present
sprintf(buf,"controller %d not present",c+1);
else {
sprintf(buf,"controller %d present\nbuttons=0x%04X x=%4d y=%4d",c+1,
cd.c[c].buttons,
cd.c[c].x,
cd.c[c].y);
}
VI_DrawText(&dc->conf,50,58+2*8*c,buf);
}
// draw a waveform
for (float x=50; x < 250; x++) {
VI_DrawPixel(&dc->conf,x,cbrt(sin((x-50)/200*M_TWOPI*4+offs))*250.0/8+175,0x7c0);
}
// the waveform can be scrolled by the x axis of the first controller
if (!cd.c[0].err) offs-=(cd.c[0].x/2*2)/32.0;
// print up some informative text, and report how long we waited for
// this frame, and how long the last frame took to render
sprintf(buf,"buffers: %5d frames: %5d\n%8lu cycles last frame\n%8lu cycles waiting\n%4.2f FPS",buffercount,framecount,lastrendertime,lastwaittime,100000000.0/(lastwaittime+lastrendertime));
VI_DrawText(&dc->conf,50,26,buf);
// calculate how many cycles this frame took to render
rendertime=(read_count()-time)*2;
lastwaittime=waittime;
lastrendertime=rendertime;
showDisplay(dc);
dc=0;
}
return 0;
}
