static void vis_fft(void)
{
int i, y;
/*this is the size of vis_overlay.width*/
unsigned char outfft[120];
if (_vis_virgin) {
vgamem_ovl_alloc(&vis_overlay);
_vis_virgin = 0;
}
_draw_vis_box();
song_lock_audio();
vgamem_ovl_clear(&vis_overlay,0);
_get_columns_from_fft(outfft,current_fft_data);
for (i = 0; i < 120; i++) {
y = outfft[i];
/*reduce range */
y >>= 3;
if (y > 15) y = 15;
if (y > 0) {
vgamem_ovl_drawline(&vis_overlay,i,15-y,i,15,5);
}
}
vgamem_ovl_apply(&vis_overlay);
song_unlock_audio();
}
static void _draw_sample_data_8(struct vgamem_overlay *r,
signed char *data, unsigned long length, unsigned int inputchans, unsigned int outputchans)
{
unsigned long pos;
unsigned int cc, co;
int level, xs, ys, xe, ye, step;
int nh, np;
int chip;
nh = (r->height / outputchans);
np = r->height - (nh / 2);
length /= inputchans;
chip = (length < (unsigned int) r->width * 2);
for (cc = 0; cc < outputchans; cc++) {
pos = 0;
co = 0;
step = MAX(1, (length / r->width) >> 8);
level=0;
do {
level+=ceil(data[(pos * inputchans) + cc+co] * nh / (float)(SCHAR_MAX - SCHAR_MIN + 1));
} while (co++ < inputchans-outputchans);
xs = 0;
ys = (np - 1) - level;
ys = CLAMP(ys, 0, r->height - 1);
do {
pos += step;
co = 0;
level=0;
do {
level+=ceil(data[(pos * inputchans) + cc+co] * nh / (SCHAR_MAX - SCHAR_MIN + 1));
} while (co++ < inputchans-outputchans);
xe = pos * r->width / length;
ye = (np - 1) - level;
xe = CLAMP(xe, 0, r->width - 1);
ye = CLAMP(ye, 0, r->height - 1);
// 'ye' is more or less useless for small samples, but this is much cleaner
// code than writing nearly the same loop four different times :P
vgamem_ovl_drawline(r, xs, ys, xe, chip ? ys : ye, SAMPLE_DATA_COLOR);
xs = xe;
ys = ye;
} while (pos < length);
np -= nh;
}
}
static void _draw_sample_data_16(struct vgamem_overlay *r,
signed short *data, unsigned long length, unsigned int inputchans, unsigned int outputchans)
{
unsigned long pos;
unsigned int cc, co;
int level, xs, ys, xe, ye, step;
int nh, np;
int chip;
nh = (r->height / outputchans);
np = r->height - (nh / 2);
length /= inputchans;
chip = (length < (unsigned int) r->width * 2);
for (cc = 0; cc < outputchans; cc++) {
pos = 0;
co = 0;
step = MAX(1, (length / r->width) >> 8);
level=0;
do {
level += ceil(data[(pos * inputchans) + cc+co] * nh / (float)(SHRT_MAX - SHRT_MIN + 1));
} while(co++ < inputchans-outputchans);
xs = 0;
ys = (np - 1) - level;
ys = CLAMP(ys, 0, r->height - 1);
do {
pos += step;
co = 0;
level = 0;
do {
level = ceil(data[(pos * inputchans) + cc+co] * nh / (float)(SHRT_MAX - SHRT_MIN + 1));
} while (co++ < inputchans-outputchans);
xe = pos * r->width / length;
ye = (np - 1) - level;
xe = CLAMP(xe, 0, r->width - 1);
ye = CLAMP(ye, 0, r->height - 1);
vgamem_ovl_drawline(r, xs, ys, xe, chip ? ys : ye, SAMPLE_DATA_COLOR);
xs = xe;
ys = ye;
} while (pos < length);
np -= nh;
}
}
