audio system basic interface

src/audio/ALAudio.h

@@ -0,0 +1,79 @@
+#ifndef SRC_AUDIO_AUDIO_H_
+#define SRC_AUDIO_AUDIO_H_
+
+#include <vector>
+#include <string>
+#include <glm/glm.hpp>
+
+#ifdef __APPLE__
+#include <OpenAL/al.h>
+#include <OpenAL/alc.h>
+#else
+#include <AL/al.h>
+#include <AL/alc.h>
+#endif
+
+#include "audio.h"
+#include "../typedefs.h"
+
+namespace audio {
+    struct ALBuffer;
+
+    struct ALSource {
+        uint id;
+        ALSource(uint id) : id(id) {}
+
+        bool isPlaying();
+        bool setPosition(glm::vec3 position);
+        bool setVelocity(glm::vec3 velocity);
+        bool setBuffer(ALBuffer* buffer);
+        bool setLoop(bool loop);
+        bool setGain(float gain);
+        bool setPitch(float pitch);
+        bool play();
+    };
+
+    struct ALBuffer {
+        uint id;
+        ALBuffer(uint id) : id(id) {}
+        bool load(int format, const char* data, int size, int freq);
+    };
+
+    class ALAudio : public Backend {
+        ALCdevice* device;
+        ALCcontext* context;
+
+        std::vector<ALSource*> allsources;
+        std::vector<ALSource*> freesources;
+
+        std::vector<ALBuffer*> allbuffers;
+        std::vector<ALBuffer*> freebuffers;
+
+        uint maxSources;
+        uint maxBuffers;
+
+        ALAudio(ALCdevice* device, ALCcontext* context);
+    public:
+        ~ALAudio();
+
+        ALSource* getFreeSource();
+        ALBuffer* getFreeBuffer();
+        void freeSource(ALSource* source);
+        void freeBuffer(ALBuffer* buffer);
+
+        std::vector<std::string> getAvailableDevices() const;
+
+        Sound* createSound(std::shared_ptr<PCM> pcm, bool keepPCM) override;
+
+        void setListener(
+            glm::vec3 position,
+            glm::vec3 velocity,
+            glm::vec3 lookAt,
+            glm::vec3 up
+        ) override;
+
+        static ALAudio* create();
+    };
+}
+
+#endif /* SRC_AUDIO_AUDIO_H_ */