fix build

Packages/com.omarator.mosissdk/README.md

@@ -48,24 +48,39 @@ Packages/com.omarator.mosissdk/
 
 ## Build Commands
 
-### Unity Build (Export to Android Studio)
+### Option 1: Direct APK Build (Recommended)
 
-Unity exports a Gradle project which is then built in Android Studio:
+Build directly to APK without exporting:
 
-1. File > Build Settings
-2. Switch Platform to Android
-3. Player Settings > Other Settings:
-   - Scripting Backend: IL2CPP
-   - Target Architectures: ARM64
-   - Graphics APIs: Vulkan, OpenGLES3 (in order of preference)
-   - Minimum API Level: 29
-4. Check "Export Project"
-5. Click Export and select output folder (e.g., `D:\Dev\Mosis\Builds\Unity\Android\MosisVR`)
+```batch
+"C:\Program Files\Unity\Hub\Editor\6000.3.2f1\Editor\Unity.exe" ^
+    -batchmode -quit -nographics ^
+    -projectPath "D:\Dev\Mosis\MosisVR" ^
+    -executeMethod BuildScript.BuildAndroidDirectCI ^
+    -outputPath "D:\Dev\Mosis\Builds\Unity\Android\MosisVR.apk" ^
+    -logFile "D:\Dev\Mosis\Builds\Unity\build.log"
+```
 
-### Build Gradle Project
+Or from Unity Editor: **Build > Build Android APK (Direct)**
 
-After exporting from Unity:
+### Option 2: Export + Gradle Build
 
+Export a Gradle project for more control over the build process:
+
+**Step 1: Export from Unity**
+```batch
+"C:\Program Files\Unity\Hub\Editor\6000.3.2f1\Editor\Unity.exe" ^
+    -batchmode -quit -nographics ^
+    -projectPath "D:\Dev\Mosis\MosisVR" ^
+    -executeMethod BuildScript.BuildAndroidCI ^
+    -export true ^
+    -outputPath "D:\Dev\Mosis\Builds\Unity\Android\MosisVR" ^
+    -logFile "D:\Dev\Mosis\Builds\Unity\build.log"
+```
+
+Or from Unity Editor: **Build > Export Android Project**
+
+**Step 2: Build with Gradle**
 ```batch
 cd D:\Dev\Mosis\Builds\Unity\Android\MosisVR
 gradle assembleRelease
@@ -76,20 +91,21 @@ gradle assembleRelease
 
 Or open in Android Studio and build from there.
 
-### Command Line Export (Optional)
+### Unity Editor Manual Build
 
-```batch
-"C:\Program Files\Unity\Hub\Editor\6000.3.2f1\Editor\Unity.exe" ^
-    -batchmode -quit -nographics ^
-    -projectPath "D:\Dev\Mosis\MosisVR" ^
-    -executeMethod BuildScript.BuildAndroidCI ^
-    -outputPath "D:\Dev\Mosis\Builds\Unity\Android\MosisVR" ^
-    -logFile "D:\Dev\Mosis\Builds\Unity\build.log"
-```
+1. File > Build Settings
+2. Switch Platform to Android
+3. Player Settings > Other Settings:
+   - Scripting Backend: IL2CPP
+   - Target Architectures: ARM64
+   - Graphics APIs: Vulkan, OpenGLES3 (in order of preference)
+   - Minimum API Level: 29
+4. For direct APK: Uncheck "Export Project", click Build
+5. For export: Check "Export Project", click Export
 
 ### Native Plugin Build (Manual)
 
-To rebuild the native library manually:
+The native plugin is built automatically during Unity's build process via CMake. To rebuild manually:
 
 ```batch
 cd Packages/com.omarator.mosissdk/Plugins/Android/cpp
@@ -166,10 +182,11 @@ The native plugin automatically selects the appropriate backend:
 |--------------|---------|--------|
 | Vulkan | VulkanTextureBackend | Preferred |
 | OpenGL ES 3.0 | OpenGLTextureBackend | Fallback |
-| OpenGL ES 2.0 | OpenGLTextureBackend | Fallback |
 
 Backend selection happens in `UnityPluginLoad()` based on the active renderer.
 
+Note: Unity 6 requires OpenGL ES 3.0 minimum. OpenGL ES 2.0 is not supported.
+
 ### Vulkan Import
 
 When using Vulkan, the plugin imports AHardwareBuffer directly as a VkImage:
@@ -226,6 +243,28 @@ adb logcat -s Unity MosisSDK Vulkan
 - Check XR input device selection matches controller
 - Test with mouse click fallback in editor
 
+### Build Fails with "glad/gles2.h not found"
+
+This error occurs when IL2CPP tries to compile native plugin C++ files. The `.meta` files for the cpp/h files must have `PluginImporter` settings with `enabled: 0` for all platforms to exclude them from IL2CPP.
+
+**Solution**: Ensure all `.meta` files in `Plugins/Android/cpp/` have proper PluginImporter exclusion settings:
+```yaml
+PluginImporter:
+  platformData:
+    Android:
+      enabled: 0
+    Any:
+      enabled: 0
+      settings:
+        Exclude Android: 1
+        Exclude Editor: 1
+        # ... exclude all platforms
+```
+
+### Build Fails with "getSdkDir() not found"
+
+The `mainTemplate.gradle` must use `System.getenv("ANDROID_HOME")` instead of `getSdkDir()` for the ANDROID_SDK cmake argument. Ensure `ANDROID_HOME` environment variable is set.
+
 ## Implementation Notes
 
 ### Files Modified in Vulkan Implementation
@@ -249,3 +288,4 @@ adb logcat -s Unity MosisSDK Vulkan
 
 - **1.0.0** - Initial release with OpenGL support
 - **1.1.0** - Added Vulkan backend, touch down/up events, dynamic resolution
+- **1.2.0** - Fixed IL2CPP build compatibility, added direct APK build support, fixed mainTemplate.gradle for direct builds