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comment code a bit better

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Eric Wasylishen 2011-12-30 11:55:20 -07:00
parent caab884744
commit 6b33701404
1 changed files with 6 additions and 1 deletions
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7
Quake/snd_mem.c
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@ -129,20 +129,25 @@ static void ResampleSfx (sfx_t *sfx, int inrate, int inwidth, byte *data)
int box_sum = 0; int box_sum = 0;
for (i = 0; i < (outcount + box_half_width); i++) for (i = 0; i < (outcount + box_half_width); i++)
{ {
// calculate the new sample we will write
const int sample_at_i = getsample(sc->data, sc->width, CLAMP(0, i, outcount - 1)); const int sample_at_i = getsample(sc->data, sc->width, CLAMP(0, i, outcount - 1));
box_sum += sample_at_i; box_sum += sample_at_i;
box_sum -= history[0]; box_sum -= history[0];
const int newsample = box_sum / box_width; const int newsample = box_sum / box_width;
// before writing the sample at write_loc, copy it to the end of the history buffer // shift the entries in the history buffer left, discarding the entry
// at history[0] and leaving a space at history[box_half_width-1]
int j; int j;
for (j=0; j<(box_half_width-1); j++) for (j=0; j<(box_half_width-1); j++)
{ {
history[j] = history[j+1]; history[j] = history[j+1];
} }
// save the sample we are going to overwrite at history[box_half_width-1]
const int write_loc = i - box_half_width; const int write_loc = i - box_half_width;
history[box_half_width-1] = getsample(sc->data, sc->width, CLAMP(0, write_loc, outcount - 1)); history[box_half_width-1] = getsample(sc->data, sc->width, CLAMP(0, write_loc, outcount - 1));
// only write the new sample if it lies within the bounds of the output array
if (write_loc >= 0 && write_loc < outcount) if (write_loc >= 0 && write_loc < outcount)
{ {
putsample(sc->data, sc->width, write_loc, newsample); putsample(sc->data, sc->width, write_loc, newsample);