added audio

[laserbrain_demo] / src / audio / audio.cc

diff --git a/src/audio/audio.cc b/src/audio/audio.cc
new file mode 100644 (file)
index 0000000..b1543b4
--- /dev/null
+++ b/src/audio/audio.cc
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include "audio.h"
+
+#include "openal.h"
+
+static ALCdevice *dev;
+static ALCcontext *ctx;
+
+bool init_audio()
+{
+       if(!(dev = alcOpenDevice(0))) {
+               fprintf(stderr, "failed to open OpenAL device\n");
+               return false;
+       }
+
+       if(!(ctx = alcCreateContext(dev, 0))) {
+               fprintf(stderr, "failed to create context\n");
+               alcCloseDevice(dev);
+               return false;
+       }
+
+       alcMakeContextCurrent(ctx);
+
+       alGetError();
+       return true;
+}
+
+void destroy_audio()
+{
+       printf("shutting down audio system\n");
+       alcMakeContextCurrent(0);
+
+       if(ctx) {
+               alcDestroyContext(ctx);
+               ctx = 0;
+       }
+
+       if(dev) {
+               alcCloseDevice(dev);
+               dev = 0;
+       }
+}
+
+void set_audio_listener(const Mat4 &xform)
+{
+       float pos[3], orient[6];
+
+       pos[0] = xform[3][0];
+       pos[1] = xform[3][1];
+       pos[2] = xform[3][2];
+
+       orient[0] = xform[2][0];
+       orient[1] = xform[2][1];
+       orient[2] = -xform[2][2];
+
+       orient[3] = xform[1][0];
+       orient[4] = xform[1][1];
+       orient[5] = xform[1][2];
+
+       alListenerfv(AL_POSITION, pos);
+       alListenerfv(AL_ORIENTATION, orient);
+}