void sound_timer(fixed16_16 frequency_step, int channel) {
direct_sound_struct *ds = direct_sound_channel + channel;
fixed16_16 fifo_fractional = ds->fifo_fractional;
u32 buffer_index = ds->buffer_index;
s16 current_sample, next_sample, dest_sample;
current_sample = ds->fifo[ds->fifo_base] << 4;
ds->fifo_base = (ds->fifo_base + 1) % 32;
next_sample = ds->fifo[ds->fifo_base] << 4;
if (sound_on) {
if (ds->volume == DIRECT_SOUND_VOLUME_50) {
current_sample >>= 1;
next_sample >>= 1;
}
switch (ds->status) {
case DIRECT_SOUND_INACTIVE:
render_samples(null);
break;
case DIRECT_SOUND_RIGHT:
render_samples(right);
break;
case DIRECT_SOUND_LEFT:
render_samples(left);
break;
case DIRECT_SOUND_LEFTRIGHT:
render_samples(both);
break;
}
} else {
static COMMAND_FUNC( do_render )
{
Data_Obj *intens_dp, *image_dp, *coord_dp;
image_dp=pick_obj( "target image" );
intens_dp=pick_obj( "source list of sampled intensities" );
coord_dp=pick_obj( "coordinate list" );
if( intens_dp==NULL || image_dp==NULL || coord_dp==NULL )
return;
render_samples(QSP_ARG image_dp,coord_dp,intens_dp);
}
