Enumerate audio devices, add multi-audio rendering

src/Audio.c

@@ -5,12 +5,12 @@
 
 #include "Dengine/Assets.h"
 #include "Dengine/Audio.h"
-#include "Dengine/Common.h"
 #include "Dengine/Debug.h"
 
 #define AL_CHECK_ERROR() alCheckError_(__FILE__, __LINE__);
 void alCheckError_(const char *file, int line)
 {
+	// NOTE(doyle): OpenAL error stack is 1 deep
 	ALenum errorCode;
 	while ((errorCode = alGetError()) != AL_NO_ERROR)
 	{
@@ -40,16 +40,50 @@ void alCheckError_(const char *file, int line)
 	}
 };
 
-const i32 audio_rendererInit(AudioRenderer *audioRenderer)
+const i32 audio_init()
 {
+	/* Clear error stack */
 	alGetError();
-	ALCdevice *deviceAL = alcOpenDevice(NULL);
+
+	ALboolean enumerateAudioDevice =
+	    alcIsExtensionPresent(NULL, "ALC_ENUMERATION_EXT");
+
+	const ALCchar *device = NULL;
+	if (enumerateAudioDevice == AL_TRUE)
+	{
+		// TODO(doyle): Actually allow users to choose device to output
+		/*
+		  The OpenAL specification says that the list of devices is organized as
+		  a string devices are separated with a NULL character and the list is
+		  terminated by two NULL characters.
+
+		  alcGetString with NULL = get all device spcifiers not a particular one
+		*/
+		device        = alcGetString(NULL, ALC_DEVICE_SPECIFIER);
+		const ALCchar *next = device + 1;
+		size_t len = 0;
+
+		printf("Devices list:\n");
+		printf("----------\n");
+		while (device && *device != '\0' && next && *next != '\0')
+		{
+			printf("%s\n", device);
+			len = common_strlen(device);
+			device += (len + 1);
+			next += (len + 2);
+		}
+		printf("----------\n");
+	}
+
+	/* Get audio device */
+	ALCdevice *deviceAL = alcOpenDevice(device);
 	if (!deviceAL)
 	{
 		printf("alcOpenDevice() failed: Failed to init OpenAL device.\n");
 		return -1;
 	}
 
+	/* Set device context */
 	ALCcontext *contextAL = alcCreateContext(deviceAL, NULL);
 	alcMakeContextCurrent(contextAL);
 	if (!contextAL)
@@ -59,6 +93,11 @@ const i32 audio_rendererInit(AudioRenderer *audioRenderer)
 	}
 	AL_CHECK_ERROR();
 
+	return 0;
+}
+
+const i32 audio_rendererInit(AudioRenderer *audioRenderer)
+{
 	/* Generate number of concurrent audio file listeners */
 	alGenSources(ARRAY_COUNT(audioRenderer->sourceId), audioRenderer->sourceId);
 	AL_CHECK_ERROR();

src/dengine.c

@@ -113,6 +113,14 @@ int main()
 	 * INITIALISE AUDIO
 	 *******************
 	 */
+	i32 result = audio_init();
+	if (result)
+	{
+#ifdef DENGINE_DEBUG
+		ASSERT(INVALID_CODE_PATH);
+#endif
+	}
+
 	AudioRenderer audioRenderer = {0};
 	audio_rendererInit(&audioRenderer);
 
@@ -128,6 +136,12 @@ int main()
 
 	audio_streamVorbis(&audioRenderer, audio);
 
+	AudioRenderer overworldAudioRenderer = {0};
+	audio_rendererInit(&overworldAudioRenderer);
+	AudioVorbis *overworldAudio =
+	    asset_getVorbis(&worldTraveller.assetManager, audiolist_overworld);
+	audio_streamVorbis(&overworldAudioRenderer, overworldAudio);
+
 	/*
 	 *******************
 	 * GAME LOOP
@@ -159,6 +173,7 @@ int main()
 		worldTraveller_gameUpdateAndRender(&worldTraveller, secondsElapsed);
 		GL_CHECK_ERROR();
 		audio_updateAndPlay(&audioRenderer);
+		//audio_updateAndPlay(&overworldAudioRenderer);
 
 		/* Swap the buffers */
 		glfwSwapBuffers(window);

src/include/Dengine/Audio.h

@@ -3,6 +3,8 @@
 
 #include <OpenAL/al.h>
 
+#include "Dengine/Common.h"
+
 typedef struct AudioRenderer
 {
 	ALuint sourceId[1];
@@ -12,6 +14,7 @@ typedef struct AudioRenderer
 	ALuint format;
 } AudioRenderer;
 
+const i32 audio_init();
 const i32 audio_rendererInit(AudioRenderer *audioRenderer);
 void audio_streamVorbis(AudioRenderer *audioRenderer, AudioVorbis *vorbis);
 void audio_updateAndPlay(AudioRenderer *audioRenderer);