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Add l/r channel scaling

This commit is contained in:
Jeffrey Pfau 2013-10-20 01:58:52 -07:00
parent cc8eeb4353
commit ca80e5f32b
1 changed files with 12 additions and 9 deletions
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21
src/gba/gba-audio.c
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@ -450,40 +450,43 @@ static int32_t _updateChannel4(struct GBAAudioChannel4* ch) {
static void _sample(struct GBAAudio* audio) { static void _sample(struct GBAAudio* audio) {
int32_t sampleLeft = 0; int32_t sampleLeft = 0;
int32_t sampleRight = 0; int32_t sampleRight = 0;
int psgShift = 2 - audio->volume; int psgShift = 1 + audio->volume;
if (audio->ch1Left) { if (audio->ch1Left) {
sampleLeft += audio->ch1.sample >> psgShift; sampleLeft += audio->ch1.sample;
} }
if (audio->ch1Right) { if (audio->ch1Right) {
sampleRight += audio->ch1.sample >> psgShift; sampleRight += audio->ch1.sample;
} }
if (audio->ch2Left) { if (audio->ch2Left) {
sampleLeft += audio->ch2.sample >> psgShift; sampleLeft += audio->ch2.sample;
} }
if (audio->ch2Right) { if (audio->ch2Right) {
sampleRight += audio->ch2.sample >> psgShift; sampleRight += audio->ch2.sample;
} }
if (audio->ch3Left) { if (audio->ch3Left) {
sampleLeft += audio->ch3.sample >> psgShift; sampleLeft += audio->ch3.sample;
} }
if (audio->ch3Right) { if (audio->ch3Right) {
sampleRight += audio->ch3.sample >> psgShift; sampleRight += audio->ch3.sample;
} }
if (audio->ch4Left) { if (audio->ch4Left) {
sampleLeft += audio->ch4.sample >> psgShift; sampleLeft += audio->ch4.sample;
} }
if (audio->ch4Right) { if (audio->ch4Right) {
sampleRight += audio->ch4.sample >> psgShift; sampleRight += audio->ch4.sample;
} }
sampleLeft = (sampleLeft * (1 + audio->volumeLeft)) >> psgShift;
sampleRight = (sampleRight * (1 + audio->volumeRight)) >> psgShift;
if (audio->chALeft) { if (audio->chALeft) {
sampleLeft += (audio->chA.sample << 2) >> !audio->volumeChA; sampleLeft += (audio->chA.sample << 2) >> !audio->volumeChA;
} }