From 93d033a3c6734cf92c32b2219bbb9f8e3aea55bf Mon Sep 17 00:00:00 2001
From: Arslaan Pathan <arslaan@arslaancodes.com>
Date: Thu, 13 Aug 2026 19:10:04 +1200
Subject: Work on making a proper event loop and implementing more of the
 engine

---
 AndroidManifest.xml |   2 +-
 Makefile            |   2 +-
 jni/Android.mk      |   2 +-
 jni/Application.mk  |   1 +
 jni/main.c          | 132 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 5 files changed, 135 insertions(+), 4 deletions(-)

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index d2399c0..2ff66cb 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.arslaancodes.mokuassistant">
 
-    <uses-sdk android:minSdkVersion="9" />
+    <uses-sdk android:minSdkVersion="25" android:targetSdkVersion="34"/>
     <application android:label="moku Assistant" android:hasCode="false">
         <activity android:name="android.app.NativeActivity">
             <meta-data android:name="android.app.lib_name"
diff --git a/Makefile b/Makefile
index 7ac6f95..1af4a69 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ moku-assistant.apk: AndroidManifest.xml libs/arm64-v8a/libmoku.so debug.keystore
 	rm -rf apk
 	mkdir -p apk/libs/arm64-v8a
 	cp libs/arm64-v8a/libmoku.so apk/libs/arm64-v8a
-	aapt package -f -M AndroidManifest.xml -I ${ANDROID_SDK_ROOT}/platforms/android-34/android.jar -F moku-assistant.apk apk/
+	aapt package -f -M AndroidManifest.xml -I $(ANDROID_SDK_ROOT)/platforms/android-34/android.jar -F moku-assistant.apk apk/
 	apksigner sign --ks debug.keystore --ks-pass pass:android moku-assistant.apk
 
 libs/arm64-v8a/libmoku.so:
diff --git a/jni/Android.mk b/jni/Android.mk
index b41aa2e..70d03d2 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -3,7 +3,7 @@ include $(CLEAR_VARS)
 
 LOCAL_MODULE := moku
 LOCAL_SRC_FILES := main.c
-LOCAL_LDLIBS := -llog -landroid
+LOCAL_LDLIBS := -llog -landroid -lEGL -lGLESv1_CM
 LOCAL_STATIC_LIBRARIES := android_native_app_glue
 
 include $(BUILD_SHARED_LIBRARY)
diff --git a/jni/Application.mk b/jni/Application.mk
index 9ddd3c4..5c3422c 100644
--- a/jni/Application.mk
+++ b/jni/Application.mk
@@ -1 +1,2 @@
 APP_ABI := arm64-v8a
+APP_PLATFORM := android-25
diff --git a/jni/main.c b/jni/main.c
index f309e64..12ed679 100644
--- a/jni/main.c
+++ b/jni/main.c
@@ -1,17 +1,147 @@
 #include <android_native_app_glue.h>
 #include <android/log.h>
+#include <android/sensor.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <android/native_window.h>
+#include <android/set_abort_message.h>
+#include <android/choreographer.h>
+#include <android/hardware_buffer.h>
+#include <time.h>
+
+#define LOG_TAG "moku"
+
+#define _LOG(priority, fmt, ...)                    \
+  ((void)__android_log_print((priority), (LOG_TAG), \
+                             (fmt)__VA_OPT__(, ) __VA_ARGS__))
+
+#define LOGE(fmt, ...) _LOG(ANDROID_LOG_ERROR, (fmt)__VA_OPT__(, ) __VA_ARGS__)
+#define LOGW(fmt, ...) _LOG(ANDROID_LOG_WARN, (fmt)__VA_OPT__(, ) __VA_ARGS__)
+#define LOGI(fmt, ...) _LOG(ANDROID_LOG_INFO, (fmt)__VA_OPT__(, ) __VA_ARGS__)
+
+enum Color {
+	COLOR_RED = 0x000000ff,
+	COLOR_GREEN = 0x0000ff00,
+	COLOR_BLUE = 0x00ff0000
+};
+
+struct engine {
+	struct android_app *app;
+	int window_initialized;
+	int running;
+	int color;
+	uint64_t last_update;
+};
+
+struct engine *engine_new(struct android_app* app) {
+	struct engine engine;
+
+	memset(&engine, 0, sizeof(engine));
+	engine.window_initialized = 0;
+	engine.app = app;
+	engine.running = 0;
+	engine.color = 0;
+	engine.last_update = (uint64_t)0;
+}
+
+uint64_t get_timestamp_ns() {
+	struct timespec ts;
+	clock_gettime(CLOCK_REALTIME, &ts);
+	return (uint64_t)ts.tv_nsec + (uint64_t)ts.tv_sec * 1000000000;
+}
+
+static void engine_schedule_tick(struct engine *engine);
+
+static void engine_real_tick(struct engine *engine) {
+	if (!engine->running) return;
+
+	engine_schedule_tick(engine);
+}
+
+static void engine_tick(long frameTimeNanos, void *data) {
+	struct engine *engine;
+
+	if (!data) return;
+	engine = (struct engine*)data;
+
+	engine_real_tick(engine);
+}
+
+static void engine_schedule_tick(struct engine *engine) {
+	AChoreographer_postFrameCallback(AChoreographer_getInstance(), engine_tick, (void*)engine);
+}
+
+/* TODO implement these stubs */
+void engine_attach_window(struct engine *engine) {
+	if (ANativeWindow_setBuffersGeometry(engine->app->window, 0, 0, AHARDWAREBUFFER_FORMAT_R8G8B8X8_UNORM) < 0) {
+		engine->window_initialized = 0;
+		return;
+	}
+	engine->window_initialized = 1;	
+	engine->color = COLOR_RED;
+	engine->last_update = get_timestamp_ns();
+};
+
+void engine_detach_window(struct engine *engine) {
+	/* Called when native window for app is destroyed. 
+	 * Doesn't mean app is being killed, also happens on rotate
+	 * Normally, with a traditional OpenGL app, do cleanup here
+	 * At the moment, it's fine to just set a flag to disable the rendering loop
+	 */
+	engine->window_initialized = 0;
+};
+
+void engine_resume(struct engine *engine) { 
+	if (!engine->running) {
+		engine->running = 1;
+		engine_schedule_tick(engine);
+	}
+};
+
+
+void engine_pause(struct engine *engine) {
+	
+};
+
+static void engine_handle_cmd(struct android_app *app, int32_t cmd) {
+	struct engine *engine;
+
+	engine = (struct engine *)app->userData;
+
+	switch (cmd) {
+		case APP_CMD_INIT_WINDOW:
+			engine_attach_window(engine);
+			break;
+		case APP_CMD_TERM_WINDOW:
+			engine_detach_window(engine);
+			break;
+		case APP_CMD_GAINED_FOCUS:
+			engine_resume(engine);
+			break;
+		case APP_CMD_LOST_FOCUS:
+			engine_pause(engine);
+			break;
+	}
+}
 
 void android_main(struct android_app *state) {
 	/* Declarations */
 	struct android_poll_source *source;
+	struct engine engine;
 	int events;
 
 	/* Code starts here */
 	app_dummy(); 
 
+	memset(&engine, 0, sizeof(engine));
+	state->userData = &engine;
+	state->onAppCmd = engine_handle_cmd;
+
 	/* do stuff here */
 	
-	while (1) {
+	while (!state->destroyRequested) {
 		if (ALooper_pollAll(-1, NULL, &events, (void**)&source) >= 0) {
 			if (source) {
 				source->process(state, source);
-- 
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