diff options
Diffstat (limited to 'src/audio.c')
| -rw-r--r-- | src/audio.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/src/audio.c b/src/audio.c new file mode 100644 index 0000000..0f8a337 --- /dev/null +++ b/src/audio.c @@ -0,0 +1,125 @@ +/* + * Tuxánci 2 - A first person shooter + * Copyright (C) 2007-2011 Tuxánci Development Team + * Copyright (C) 2025-2026 Connor Thomson + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#ifdef ENABLE_AUDIO + +#include <libopenmpt/libopenmpt.h> +#include "ta_sdl.h" +#include "ta_alc.h" +#include "ta_al.h" +#include "files.h" +#include "main.h" +#include "ta_openmpt.h" + +#define TA_AUDIO_FREQUENCY_HZ 44100 +#define TA_AUDIO_BUFFER_AMOUNT 4 +#define TA_AUDIO_MIXBUFFER_SAMPLES 2048 + +ALCdevice *ta_audio_device; +ALCcontext *ta_audio_context; +ALuint ta_audio_source; +ALuint ta_audio_buffers[TA_AUDIO_BUFFER_AMOUNT]; +int16_t ta_audio_mixbuffer[TA_AUDIO_MIXBUFFER_SAMPLES]; + +static openmpt_module *ta_audio_module; + +static void ta_audio_decode(void) { + size_t frame_count = TA_AUDIO_MIXBUFFER_SAMPLES / 2; + size_t rendered = openmpt_module_read_interleaved_stereo( + ta_audio_module, + TA_AUDIO_FREQUENCY_HZ, + frame_count, + ta_audio_mixbuffer + ); + + if (rendered < frame_count) { + SDL_memset( + ta_audio_mixbuffer + rendered * 2, + 0, + (frame_count - rendered) * 2 * sizeof(*ta_audio_mixbuffer) + ); + } +} + +void ta_audio_init(void) { + ta_audio_device = ta_alc_open_device(); + + ALCint attributes[] = { + ALC_FREQUENCY, TA_AUDIO_FREQUENCY_HZ, + 0 + }; + ta_audio_context = ta_alc_create_context(ta_audio_device, attributes); + ta_alc_make_context_current(ta_audio_context); + + ta_audio_module = ta_openmpt_load_module(file_data_music_theme_it_start, file_data_music_theme_it_size); + + ta_openmpt_set_module_repeat_count(ta_audio_module, -1); + + alGenSources(1, &ta_audio_source); + + alGenBuffers(TA_AUDIO_BUFFER_AMOUNT, ta_audio_buffers); + + for (int index = 0; index < TA_AUDIO_BUFFER_AMOUNT; index++) { + ta_audio_decode(); + alBufferData( + ta_audio_buffers[index], + AL_FORMAT_STEREO16, + ta_audio_mixbuffer, + sizeof(ta_audio_mixbuffer), + TA_AUDIO_FREQUENCY_HZ + ); + } + + alSourceQueueBuffers( + ta_audio_source, + TA_AUDIO_BUFFER_AMOUNT, + ta_audio_buffers + ); + alSourcePlay(ta_audio_source); +} + +void ta_audio_update(void) { + ALint processed = 0; + alGetSourcei(ta_audio_source, AL_BUFFERS_PROCESSED, &processed); + + while (processed--) { + ALuint buffer; + alSourceUnqueueBuffers(ta_audio_source, 1, &buffer); + + ta_audio_decode(); + + alBufferData(buffer, AL_FORMAT_STEREO16, ta_audio_mixbuffer, sizeof(ta_audio_mixbuffer), TA_AUDIO_FREQUENCY_HZ); + alSourceQueueBuffers(ta_audio_source, 1, &buffer); + } +} + +void ta_audio_destroy(void) { + alSourceStop(ta_audio_source); + alDeleteSources(1, &ta_audio_source); + alDeleteBuffers(TA_AUDIO_BUFFER_AMOUNT, ta_audio_buffers); + if (!ta_audio_module) { + openmpt_module_destroy(ta_audio_module); + ta_audio_module = NULL; + } + ta_alc_make_context_current(NULL); + alcDestroyContext(ta_audio_context); + ta_alc_close_device(ta_audio_device); +} + +#endif // ENABLE_AUDIO
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