Added usage examples in C; Added asm include file with track info to sointu-compile.

examples/code/C/cplay.unix.c

@@ -0,0 +1,27 @@
+#include <alsa/asoundlib.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdint.h>
+#include "physics_girl_st.h"
+
+static SUsample sound_buffer[SU_LENGTH_IN_SAMPLES * SU_CHANNEL_COUNT];
+static snd_pcm_t *pcm_handle;
+static pthread_t render_thread;
+static uint32_t render_thread_handle;
+
+int main(int argc, char **args) {
+	// Unix does not have gm.dls, no need to ifdef and setup here.
+
+	// We render in the background while playing already.
+	render_thread_handle = pthread_create(&render_thread, 0, (void * (*)(void *))su_render_song, sound_buffer);
+
+	// We can't start playing too early or the missing samples will be audible.
+	sleep(2.);
+
+	// Play the track.
+	snd_pcm_open(&pcm_handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
+	snd_pcm_set_params(pcm_handle, SND_PCM_FORMAT_FLOAT, SND_PCM_ACCESS_RW_INTERLEAVED, SU_CHANNEL_COUNT, SU_SAMPLE_RATE, 0, SU_LENGTH_IN_SAMPLES);
+	snd_pcm_writei(pcm_handle, sound_buffer, SU_LENGTH_IN_SAMPLES);
+
+	return 0;
+}