AuroraMiddleware/AuroraOpenALSoft
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Also rotate stereo sounds in the alhrtf example

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This commit is contained in:
Chris Robinson 2016-08-24 03:49:45 -07:00
parent 849f85549d
commit d8e9b3c621
1 changed files with 22 additions and 2 deletions
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24
examples/alhrtf.c
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@ -113,6 +113,7 @@ static ALuint LoadSound(const char *filename)
int main(int argc, char **argv)
{
ALCdevice *device;
ALboolean has_angle_ext;
ALuint source, buffer;
const char *soundname;
const char *hrtfname;
@ -157,6 +158,12 @@ int main(int argc, char **argv)
LOAD_PROC(device, alcResetDeviceSOFT);
#undef LOAD_PROC
/* Check for the AL_EXT_STEREO_ANGLES extension to be able to also rotate
* stereo sources.
*/
has_angle_ext = alIsExtensionPresent("AL_EXT_STEREO_ANGLES");
printf("AL_EXT_STEREO_ANGLES%s found\n", has_angle_ext?"":" not");
/* Enumerate available HRTFs, and reset the device using one. */
alcGetIntegerv(device, ALC_NUM_HRTF_SPECIFIERS_SOFT, 1, &num_hrtf);
if(!num_hrtf)
@ -232,12 +239,25 @@ int main(int argc, char **argv)
do {
al_nssleep(10000000);
/* Rotate the source around the listener by about 1/4 cycle per second.
* Only affects mono sounds.
/* Rotate the source around the listener by about 1/4 cycle per second,
* and keep it within -pi...+pi.
*/
angle += 0.01 * M_PI * 0.5;
if(angle > M_PI)
angle -= M_PI*2.0;
/* This only rotates mono sounds. */
alSource3f(source, AL_POSITION, (ALfloat)sin(angle), 0.0f, -(ALfloat)cos(angle));
if(has_angle_ext)
{
/* This rotates stereo sounds with the AL_EXT_STEREO_ANGLES
* extension. Angles are specified counter-clockwise in radians.
*/
ALfloat angles[2] = { (ALfloat)(M_PI/6.0 - angle), (ALfloat)(-M_PI/6.0 - angle) };
alSourcefv(source, AL_STEREO_ANGLES, angles);
}
alGetSourcei(source, AL_SOURCE_STATE, &state);
} while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);