From 359b503ecc7c584bacda044a9cbe3c12f8da839c Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Tue, 24 Sep 2024 20:30:27 +1000
Subject: audio

---
 1bitjam.c |  4 +++
 Makefile  |  3 +-
 config.h  |  3 ++
 plat.c    | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 plat.h    |  4 +++
 5 files changed, 111 insertions(+), 1 deletion(-)

diff --git a/1bitjam.c b/1bitjam.c
index e811cba..c2a84e1 100644
--- a/1bitjam.c
+++ b/1bitjam.c
@@ -23,6 +23,7 @@ int entrypoint(int argc, const char** argv, Arena* m) {
 		app_memory_size
 	);
 	a = new_app(&h, game_name);
+	init_audio();
 	init_fps(&f, default_mpf);
 	while (a->o) {
 		fps_begin(&f);
@@ -38,6 +39,8 @@ int entrypoint(int argc, const char** argv, Arena* m) {
 				y--;
 			if (a->btn_states[btn_down] & btn_state_pressed)
 				y++;
+			if (a->btn_states[btn_shoot] & btn_state_just_pressed)
+				play_sound(30);
 			ren_text(&r, 30, 60, "Hello");
 			ren_map(&r, 10, 5, &rect, get_bitmap(asset_id_hello_img));
 			ren_map(&r, x, y, &rect2, get_bitmap(asset_id_guy_img));
@@ -47,6 +50,7 @@ int entrypoint(int argc, const char** argv, Arena* m) {
 		}
 		fps_end(&f);
 	}
+	deinit_audio();
 	deinit_app(a);
 	return error_none;
 }
diff --git a/Makefile b/Makefile
index bf15054..bc07003 100644
--- a/Makefile
+++ b/Makefile
@@ -3,8 +3,9 @@ tool_compiler = gcc
 linker = gcc
 cflags = -I./ -g -DDEBUG -Dplat_x11 -Dplat_x86 \
 -Dplat_posix -Dallocation_default_alignment=8 \
+-Dplat_pulse \
 -Wall -Wextra -pedantic -std=c90
-lflags = -lX11 -lXi
+lflags = -lX11 -lXi -lpulse -lpulse-simple -lpthread -lm
 target = 1bitjam
 int_dir = intermediate
 data_dir = data
diff --git a/config.h b/config.h
index 73df5f6..418e7f4 100644
--- a/config.h
+++ b/config.h
@@ -14,4 +14,7 @@
 #define default_scale 3
 #define default_mpf 50
 
+#define audio_buffer_size 64
+#define audio_sample_rate 8000
+
 #endif
diff --git a/plat.c b/plat.c
index 2101910..e178137 100644
--- a/plat.c
+++ b/plat.c
@@ -427,3 +427,101 @@ void app_end(App* a) {
 }
 
 #endif
+
+
+#ifdef plat_pulse
+#include "maths.h"
+#define inline /* erm sir we are using C90 here... */
+#include <stdlib.h>
+#include <math.h>
+#include <pulse/simple.h>
+#include <pthread.h>
+
+struct {
+	short* buf;
+	pa_simple* dev;
+	int r, play, time;
+	pthread_t worker;
+	pthread_mutex_t mutex;
+} audio;
+
+void* audio_worker(void* arg) {
+	const int s = audio_buffer_size;
+	int i, c = 1;
+	short* buf = audio.buf;
+	pa_simple* dev = audio.dev;
+	(void)arg;
+	while (c) {
+		pthread_mutex_lock(&audio.mutex);
+		if (!audio.r) c = 0;
+		for (
+			i = 0;
+			i < s && audio.play;
+			i++, audio.play--, audio.time++
+		) buf[i] = (short)(sin((double)audio.time / 0.05) * 16000.0);
+		pthread_mutex_unlock(&audio.mutex);
+		for (; i < s; i++) {
+			buf[i] = 0;
+		}
+		pa_simple_write(dev, buf, s * sizeof(short), 0);
+	}
+	return 0;
+}
+
+void init_audio(void) {
+	pa_sample_spec sp = { 0 };
+	sp.format = PA_SAMPLE_S16LE;
+	sp.channels = 1;
+	sp.rate = audio_sample_rate;
+	audio.dev = pa_simple_new(
+		0,
+		game_name,
+		PA_STREAM_PLAYBACK,
+		0,
+		"Game Audio",
+		&sp,
+		0,
+		0,
+		0
+	);
+	audio.r = 0;
+	audio.play = 0;
+	if (!audio.dev) {
+		print_err("Failed to create audio device.\n");
+		print_war("Running without audio.\n");
+		return;
+	}
+	audio.r = 1;
+	audio.buf = malloc(
+		audio_buffer_size *
+		sizeof *audio.buf
+	);
+	pthread_mutex_init(&audio.mutex, 0);
+	pthread_create(
+		&audio.worker,
+		0,
+		audio_worker,
+		0
+	);
+}
+
+void deinit_audio(void) {
+	if (audio.dev) {
+		pthread_mutex_lock(&audio.mutex);
+		audio.r = 0;
+		pthread_mutex_unlock(&audio.mutex);
+		pthread_mutex_destroy(&audio.mutex);
+		pthread_join(audio.worker, 0);
+		pa_simple_drain(audio.dev, 0);
+		pa_simple_free(audio.dev);
+		free(audio.buf);
+	}
+}
+
+void play_sound(int len) {
+	pthread_mutex_lock(&audio.mutex);
+	audio.play += len;
+	pthread_mutex_unlock(&audio.mutex);
+}
+
+#endif
diff --git a/plat.h b/plat.h
index 27d8d0a..ac41b7e 100644
--- a/plat.h
+++ b/plat.h
@@ -73,4 +73,8 @@ void deinit_app(App* a);
 void app_begin(App* a);
 void app_end(App* a);
 
+void init_audio(void);
+void deinit_audio(void);
+void play_sound(int len);
+
 #endif
-- 
cgit v1.2.3-54-g00ecf