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Fix sdl sound

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This commit is contained in:
Miloslav Číž 2020-10-01 17:10:52 +02:00
parent 6f78cc0338
commit 037b8419dc
1 changed files with 11 additions and 8 deletions
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19
main_sdl.c
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@ -27,7 +27,7 @@
#define SFG_LOG(str) puts(str);
#define SFG_START_LEVEL 1
// #define SFG_START_LEVEL 1
// #define SFG_IMMORTAL 1
#define SFG_UNLOCK_DOOR 1
#define SFG_REVEAL_MAP 1
@ -45,7 +45,7 @@
*/
#define SFG_PLAYER_DAMAGE_MULTIPLIER 1024
#define MUSIC_VOLUME 5
#define MUSIC_VOLUME 64
#ifdef __EMSCRIPTEN__
#define SFG_FPS 30
@ -299,7 +299,8 @@ uint16_t audioPos = 0;
static inline uint16_t mixSamples(uint16_t sample1, uint16_t sample2)
{
return (sample1 + sample2) >> 1; //(sample1 >> 1) + (sample2 >> 1);
//return (sample1 + sample2) >> 1; //(sample1 >> 1) + (sample2 >> 1);
return sample1 + sample2; //(sample1 >> 1) + (sample2 >> 1);
}
uint8_t musicOn = 1;
@ -311,7 +312,8 @@ void audioFillCallback(void *userdata, uint8_t *s, int l)
for (int i = 0; i < l / 2; ++i)
{
s16[i] = musicOn ?
mixSamples(audioBuff[audioPos],SFG_getNextMusicSample() << MUSIC_VOLUME) :
mixSamples(audioBuff[audioPos],(128 - SFG_getNextMusicSample())
* MUSIC_VOLUME) :
audioBuff[audioPos];
audioBuff[audioPos] = 0;
@ -326,14 +328,15 @@ void SFG_enableMusic(uint8_t enable)
void SFG_playSound(uint8_t soundIndex, uint8_t volume)
{
volume = 255;
uint16_t pos = audioPos;
uint8_t volumeShift = 15 - volume / 16;
uint16_t baseLevel = -1 * (0x8000 >> volumeShift);
uint8_t volumeScale = 1 << (volume / 32);
for (int i = 0; i < SFG_SFX_SAMPLE_COUNT; ++i)
{
audioBuff[pos] = mixSamples(audioBuff[pos],baseLevel +
((SFG_GET_SFX_SAMPLE(soundIndex,i) << 8) >> volumeShift));
audioBuff[pos] =
(128 - SFG_GET_SFX_SAMPLE(soundIndex,i)) * volumeScale;
pos = (pos < SFG_SFX_SAMPLE_COUNT - 1) ? (pos + 1) : 0;
}