initial bringup

build.gradle

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+plugins {
+    id 'com.android.library'
+}
+
+android {
+    namespace 'com.swung0x48.mobileglues'
+    compileSdk 34
+
+    defaultConfig {
+        minSdk 24
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+        externalNativeBuild {
+            cmake {
+                cppFlags ""
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+        fordebug {
+            debuggable true
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path "src/main/cpp/CMakeLists.txt"
+            version "3.22.1"
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.10.0'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+}

local.properties

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+## This file must *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+#
+# Location of the SDK. This is only used by Gradle.
+# For customization when using a Version Control System, please read the
+# header note.
+#Mon Oct 07 23:18:27 CST 2024
+sdk.dir=/Users/swung0x48/Library/Android/sdk

proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

src/main/cpp/CMakeLists.txt

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+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html.
+# For more examples on how to use CMake, see https://github.com/android/ndk-samples.
+
+# Sets the minimum CMake version required for this project.
+cmake_minimum_required(VERSION 3.22.1)
+
+# Declares the project name. The project name can be accessed via ${ PROJECT_NAME},
+# Since this is the top level CMakeLists.txt, the project name is also accessible
+# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level
+# build script scope).
+project("mobileglues")
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+#
+# In this top level CMakeLists.txt, ${CMAKE_PROJECT_NAME} is used to define
+# the target library name; in the sub-module's CMakeLists.txt, ${PROJECT_NAME}
+# is preferred for the same purpose.
+#
+# In order to load a library into your app from Java/Kotlin, you must call
+# System.loadLibrary() and pass the name of the library defined here;
+# for GameActivity/NativeActivity derived applications, the same library name must be
+# used in the AndroidManifest.xml file.
+add_library(${CMAKE_PROJECT_NAME} SHARED
+        # List C/C++ source files with relative paths to this CMakeLists.txt.
+        native-lib.cpp
+        main.c)
+
+# Specifies libraries CMake should link to your target library. You
+# can link libraries from various origins, such as libraries defined in this
+# build script, prebuilt third-party libraries, or Android system libraries.
+target_link_libraries(${CMAKE_PROJECT_NAME}
+        # List libraries link to the target library
+        android
+        log
+        EGL)

src/main/cpp/includes.h

@@ -0,0 +1,39 @@
+//
+// Created by Swung 0x48 on 2024/10/7.
+//
+
+#ifndef MOBILEGLUES_INCLUDES_H
+#define MOBILEGLUES_INCLUDES_H
+
+#define RENDERERNAME "MobileGlues"
+#include <android/log.h>
+#include <dlfcn.h>
+
+#include <EGL/egl.h>
+#include <GLES3/gl32.h>
+
+#define _mglues_dlopen(name) dlopen(name, RTLD_LAZY)
+#define _mglues_dlclose(handle) dlclose(handle)
+#define _mglues_dlsym(handle, name) dlsym(handle, name)
+
+static int g_initialized = 0;
+
+typedef __eglMustCastToProperFunctionPointerType (EGLGETPROCADDRESSPROC) (const char *procname);
+typedef EGLGETPROCADDRESSPROC* EGLGETPROCADDRESSPROCP;
+typedef EGLContext (EGLCREATECONTEXTPROC) (EGLDisplay, EGLConfig, EGLContext, const EGLint *);
+typedef EGLCREATECONTEXTPROC* EGLCREATECONTEXTPROCP;
+typedef EGLBoolean (EGLDESTROYCONTEXTPROC) (EGLDisplay, EGLContext);
+typedef EGLDESTROYCONTEXTPROC* EGLDESTROYCONTEXTPROCP;
+typedef EGLBoolean (EGLMAKECURRENTPROC)(EGLDisplay, EGLSurface, EGLSurface, EGLContext);
+typedef EGLMAKECURRENTPROC* EGLMAKECURRENTPROCP;
+
+struct egl_func_t {
+    EGLGETPROCADDRESSPROCP eglGetProcAddress;
+    EGLCREATECONTEXTPROCP eglCreateContext;
+    EGLDESTROYCONTEXTPROCP eglDestroyContext;
+    EGLMAKECURRENTPROCP eglMakeCurrent;
+};
+
+static struct egl_func_t g_target_egl_func;
+
+#endif //MOBILEGLUES_INCLUDES_H

src/main/cpp/main.c

@@ -0,0 +1,113 @@
+//
+// Created by Swung 0x48 on 2024/10/7.
+//
+
+#include <string.h>
+#include "includes.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void init_target_egl();
+void init_target_gles();
+__eglMustCastToProperFunctionPointerType prehook(const char *procname);
+__eglMustCastToProperFunctionPointerType posthook(const char *procname);
+
+void proc_init() {
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "Initializing %s @ %s", RENDERERNAME, __FUNCTION__);
+
+    void* handle = _mglues_dlopen("libEGL.so");
+    if (handle == NULL)
+        __android_log_print(ANDROID_LOG_FATAL, RENDERERNAME,
+                            "Cannot load system libEGL.so!");
+
+    g_target_egl_func.eglGetProcAddress = dlsym(handle, "eglGetProcAddress");
+
+    init_target_egl();
+    init_target_gles();
+
+    g_initialized = 1;
+}
+
+void init_target_egl() {
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "Initializing %s @ %s", RENDERERNAME, __FUNCTION__);
+
+    g_target_egl_func.eglCreateContext =
+            (EGLCREATECONTEXTPROCP)g_target_egl_func.eglGetProcAddress("eglCreateContext");
+    g_target_egl_func.eglDestroyContext =
+            (EGLDESTROYCONTEXTPROCP) g_target_egl_func.eglGetProcAddress("eglDestroyContext");
+    g_target_egl_func.eglMakeCurrent =
+            (EGLMAKECURRENTPROCP) g_target_egl_func.eglGetProcAddress("eglMakeCurrent");
+
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "Got host eglCreateContext @ 0x%lx", g_target_egl_func.eglCreateContext);
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "Got host eglDestroyContext @ 0x%lx", g_target_egl_func.eglDestroyContext);
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "Got host eglMakeCurrent @ 0x%lx", g_target_egl_func.eglMakeCurrent);
+}
+
+void init_target_gles() {
+
+}
+
+__eglMustCastToProperFunctionPointerType prehook(const char *procname) {
+    if (strcmp(procname, "glGetString") == 0)
+        return (__eglMustCastToProperFunctionPointerType) glGetString;
+    return NULL;
+}
+
+__eglMustCastToProperFunctionPointerType posthook(const char *procname) {
+    return NULL;
+}
+
+EGLAPI __eglMustCastToProperFunctionPointerType EGLAPIENTRY glXGetProcAddress (const char *procname) {
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "%s @ %s(%s)", RENDERERNAME, __FUNCTION__, procname);
+
+    if (!g_initialized) {
+        proc_init();
+    }
+
+    __eglMustCastToProperFunctionPointerType proc = NULL;
+
+    proc = prehook(procname);
+    if (proc) return proc;
+    else
+        __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                            "UnImplemented function: %s(%s) @ prehook", __FUNCTION__, procname);
+
+    //proc = eglGetProcAddress(procname);
+    if (proc) return proc;
+    else
+        __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                            "UnImplemented function: %s(%s) @ system", __FUNCTION__, procname);
+
+    proc = posthook(procname);
+    if (!proc)
+        __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                            "UnImplemented function: %s(%s) @ posthook", __FUNCTION__, procname);
+    return proc;
+}
+
+EGLAPI __eglMustCastToProperFunctionPointerType EGLAPIENTRY eglGetProcAddress (const char *procname) {
+    __android_log_print(ANDROID_LOG_VERBOSE, RENDERERNAME,
+                        "%s @ %s(%s)", RENDERERNAME, __FUNCTION__, procname);
+}
+
+GL_APICALL const GLubyte *GL_APIENTRY glGetString (GLenum name) {
+    switch (name) {
+        case GL_VENDOR: return "GL_VENDOR";
+        case GL_RENDERER:
+            return "GL_VENDOR";
+        default:
+            return "default";
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif

src/main/cpp/native-lib.cpp

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+#include <jni.h>
+#include <string>
+
+extern "C" JNIEXPORT jstring JNICALL
+Java_com_swung0x48_mobileglues_MainActivity_stringFromJNI(
+        JNIEnv* env,
+        jobject /* this */) {
+    std::string hello = "Hello from C++";
+    return env->NewStringUTF(hello.c_str());
+}
+
+extern "C" JNIEXPORT jstring JNICALL
+Java_com_swung0x48_mobilegluesapp_MainActivity_stringFromJNI(
+        JNIEnv* env,
+        jobject /* this */) {
+    std::string hello = "Hello from C++";
+    return env->NewStringUTF(hello.c_str());
+}