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Rename GBAAudioWave to GBAAudioEnvelope, add fields for internal state

This commit is contained in:
Jeffrey Pfau 2013-10-18 08:10:10 -07:00
parent 7393351e27
commit d99bf7fdff
2 changed files with 20 additions and 14 deletions
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8
src/gba/gba-audio.c
View File

@ -25,6 +25,8 @@ void GBAAudioInit(struct GBAAudio* audio) {
audio->eventDiff = 0;
audio->nextSample = 0;
audio->sampleRate = 0x8000;
audio->soundcntLo = 0;
audio->soundcntHi = 0;
audio->sampleInterval = GBA_ARM7TDMI_FREQUENCY / audio->sampleRate;
CircleBufferInit(&audio->left, GBA_AUDIO_SAMPLES * sizeof(int32_t));
@ -107,7 +109,7 @@ void GBAAudioWriteSOUND1CNT_LO(struct GBAAudio* audio, uint16_t value) {
}
void GBAAudioWriteSOUND1CNT_HI(struct GBAAudio* audio, uint16_t value) {
audio->ch1.wave.packed = value;
audio->ch1.envelope.packed = value;
}
void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value) {
@ -115,7 +117,7 @@ void GBAAudioWriteSOUND1CNT_X(struct GBAAudio* audio, uint16_t value) {
}
void GBAAudioWriteSOUND2CNT_LO(struct GBAAudio* audio, uint16_t value) {
audio->ch2.wave.packed = value;
audio->ch2.envelope.packed = value;
}
void GBAAudioWriteSOUND2CNT_HI(struct GBAAudio* audio, uint16_t value) {
@ -135,7 +137,7 @@ void GBAAudioWriteSOUND3CNT_X(struct GBAAudio* audio, uint16_t value) {
}
void GBAAudioWriteSOUND4CNT_LO(struct GBAAudio* audio, uint16_t value) {
audio->ch4.wave.packed = value;
audio->ch4.envelope.packed = value;
}
void GBAAudioWriteSOUND4CNT_HI(struct GBAAudio* audio, uint16_t value) {

12
src/gba/gba-audio.h
View File

@ -10,7 +10,8 @@ struct GBADMA;
const unsigned GBA_AUDIO_SAMPLES;
union GBAAudioWave {
struct GBAAudioEnvelope {
union {
struct {
unsigned length : 6;
unsigned duty : 2;
@ -19,6 +20,9 @@ union GBAAudioWave {
unsigned initialVolume : 4;
};
uint16_t packed;
};
int currentVolume;
int32_t nextStep;
};
union GBAAudioSquareControl {
@ -42,12 +46,12 @@ struct GBAAudioChannel1 {
uint16_t packed;
} sweep;
union GBAAudioWave wave;
struct GBAAudioEnvelope envelope;
union GBAAudioSquareControl control;
};
struct GBAAudioChannel2 {
union GBAAudioWave wave;
struct GBAAudioEnvelope envelope;
union GBAAudioSquareControl control;
};
@ -86,7 +90,7 @@ struct GBAAudioChannel3 {
};
struct GBAAudioChannel4 {
union GBAAudioWave wave;
struct GBAAudioEnvelope envelope;
union {
struct {
unsigned ratio : 3;