Using Agar with SDL Mixer
From Agar
Agar works with the sound library SDL_Mixer without a hitch. Call these example functions after Agar has been initialized. Use these functions to open and close the audio device:
#include <stdbool.h> #include <SDL.h> #include <SDL_mixer.h> bool inited = 0; int audio_rate = 22050; int audio_channels = 2; int audio_buffers = 1024; Uint16 audio_format = AUDIO_S16; /* 16-bit stereo */ int mixer_channels = 128; void init_audio() { if (inited) { close_audio(); } inited = 1; /* * This is where we open up our audio device. Mix_OpenAudio * takes as its parameters the audio format we'd /like/ to * have. */ Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers); /* * If we actually care about what we got, we can ask here. In this * program we don't, but I'm showing the function call here anyway * in case we'd want to know later. */ Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels); mixer_channels = Mix_AllocateChannels(mixer_channels); /* Load sounds directory ... */ } /* This is the cleaning up part */ void close_audio() { if (inited) Mix_CloseAudio(); }
Elsewhere you may wish to attach an event that plays a sound too, in this example, a button press. Since Agar triggers the AG_Event by default after the mouse button is released, this is how we can use an AG_Event function to trigger percussively (on mouse down):
void PlaySample(AG_Event *event) { Mix_Chunk *sample = AG_PTR(1); int loop = AG_INT(2); int channel; if (!inited) { return; } channel = Mix_PlayChannel(-1, sample, loop); /* Unreg fx, set default panning/position. */ Mix_SetPanning(channel, 255,255); Mix_SetPosition( channel, 0,0); } AG_Button *btn; Mix_Chunk *mySample; ... btn = AG_ButtonNewFn(window, 0, "Play sound once", PlaySample, "%p,%i", mySample, 0); btn = AG_ButtonNewFn(window, 0, "Play sound twice", PlaySample, "%p,%i", mySample, 1);
