rework audio system to be able to call it from anywhere, rather than having to have access to the audio data.

src/io/audio.h

@@ -3,18 +3,31 @@
 #include <SDL_audio.h>
 #include <stdint.h>
 
+#include "../util/types.h"
+
 #define AUDIO_MAX 4 // maximum number of sound effects that are allowed to play at once
 
 struct audiodata {
-	uint8_t* buf; // pointer to the audio buffer
-	uint32_t len; // length in bytes of the audio buffer
-	uint32_t ms;  // length in miliseconds of the audio buffer
+	u8 const* buf; // pointer to the audio buffer
+	u32 len;       // length in bytes of the audio buffer
+	u32 ms;        // length in miliseconds of the audio buffer
 };
-typedef struct audiodata audiodata;
 
-int audio_device_init(int, SDL_AudioFormat, uint8_t, uint16_t);
-void audio_device_free(void);
-void audio_play(audiodata const*);
+enum audio_id {
+	AUDIO_ID_MUSIC,
+	AUDIO_ID_PLACE,
 
-audiodata audio_wav_load(char const*);
-void audio_wav_unload(audiodata*);
+	// leave at end, will contain count
+	AUDIO_ID_COUNT,
+};
+
+extern struct audiodata audio_dat[AUDIO_ID_COUNT];
+
+/* loads the audio to be played, unless `AUDIO_MAX` has been reached, then this call will fail */
+void audio_play(u32);
+
+/* initialises the audio device, then loads the audio data */
+int audio_init(int freq, SDL_AudioFormat fmt, u8 ch, u16 samples);
+
+/* frees up resources held by the audio device and audio buffers */
+void audio_free(void);