pke: audio: first-pass actually play an asset

1 files changed, 51 insertions, 5 deletions

diff --git a/src/audio.cpp b/src/audio.cpp
index c3f152e..194c01c 100644
--- a/src/audio.cpp
+++ b/src/audio.cpp
@@ -1,13 +1,19 @@
 #define PKE_AUDIO_IMPL_PIPEWIRE
 
-#include "audio.hpp"
-
+#include "asset-manager.hpp"
 #include "audio-impl-pw.hpp"
+#include "audio.hpp"
+#include "pk.h"
 
 struct pke_audio_master pke_audio_mstr{};
 
 void pke_audio_init() {
+	pke_audio_mstr.master_volume = 1.f;
 	pke_audio_mstr.channel_count = 2;
+	pke_audio_mstr.bkt_transient = pk_mem_bucket_create("pke_audio", PK_MEM_DEFAULT_BUCKET_SIZE, PK_MEMBUCKET_FLAG_TRANSIENT);
+	for (uint8_t i = 0; i < pke_audio_mstr.channel_count; ++i) {
+		pke_audio_mstr.source_volumes[i] = 1.f;
+	}
 #ifdef PKE_AUDIO_IMPL_PIPEWIRE
 	pke_audio_pw_init();
 #endif
@@ -16,12 +22,13 @@ void pke_audio_teardown() {
 #ifdef PKE_AUDIO_IMPL_PIPEWIRE
 	pke_audio_pw_teardown();
 #endif
+	pk_mem_bucket_destroy(pke_audio_mstr.bkt_transient);
 }
 void pke_audio_tick(double delta) {
 	(void)delta;
 #ifdef PKE_AUDIO_IMPL_PIPEWIRE
 	if (pke_audio_pw.is_needing_output_remapped == true) {
-		pke_audio_pw.is_needing_output_remapped = !pke_audio_pw_remap_outputs();
+		pke_audio_pw_remap_outputs();
 	}
 #endif
 }
@@ -34,5 +41,44 @@ void  pke_audio_set_volume(pke_audio_source source, float volume) {
 	pke_audio_mstr.source_volumes[static_cast<pke_audio_source_T>(source)] = volume;
 }
 
-void pke_audio_play(AssetHandle handle, pke_audio_source audio_source, pke_audio_flags flags);
-void pke_audio_stop_all();
+bool pke_audio_playing_objects_find_first_by_key(void *user_data, void *arr_data) {
+	std::tuple<AssetHandle, pke_audio_source> &tup = *reinterpret_cast<std::tuple<AssetHandle, pke_audio_source>*>(user_data);
+	pke_audio_obj &audio_obj = *reinterpret_cast<pke_audio_obj*>(arr_data);
+	return std::get<0>(tup) == audio_obj.handle && std::get<1>(tup) == audio_obj.source;
+}
+void pke_audio_play(AssetHandle handle, pke_audio_source audio_source, glm::vec3 position_source, pke_audio_flags flags) {
+	// TODO validation: audio length (does it fit in uint32_t), etc
+	// TODO rethink threading: first-pass only mutex
+	std::tuple<AssetHandle, pke_audio_source> tup {handle, audio_source};
+	pke_audio_mstr.mtx_buffer.lock();
+	uint32_t idx = pk_arr_find_first_index(&pke_audio_mstr.playing_objects, &tup, pke_audio_playing_objects_find_first_by_key);
+	pke_audio_obj *aobj = NULL;
+	if (idx == uint32_t(-1)) {
+		AM_Get(handle); // keep the asset in memory, freed when play_count hits 0
+		pk_arr_append_t(&pke_audio_mstr.playing_objects, {});
+		aobj = &pke_audio_mstr.playing_objects[pke_audio_mstr.playing_objects.next-1];
+		memset(aobj, 0, sizeof(pke_audio_obj));
+		aobj->handle = handle;
+		aobj->source = audio_source;
+		aobj->play_count = 1;
+		idx = 0;
+	} else {
+		aobj = &pke_audio_mstr.playing_objects[idx];
+		idx = aobj->play_count;
+		aobj->play_count += 1;
+	}
+	aobj->position_source[idx] = position_source;
+	aobj->flags[idx]           = flags;
+	aobj->play_heads[idx]      = 0;
+	pke_audio_mstr.mtx_buffer.unlock();
+}
+void pke_audio_stop_all() {
+	// TODO fade-out instead of hard-cut? Maybe that should be a separate function.
+	uint32_t i;
+	pke_audio_mstr.mtx_buffer.lock();
+	for (i = 0; i < pke_audio_mstr.playing_objects.next; ++i) {
+		AM_Release(pke_audio_mstr.playing_objects[i].handle);
+	}
+	pk_arr_clear(&pke_audio_mstr.playing_objects);
+	pke_audio_mstr.mtx_buffer.unlock();
+}