Check OpenGL ES capability on Android

There are lots of Android devices around the world. And when you want to create one application that need OpenGL ES, you would think (what I thought) if the user's device can run smoothly by checking the OpenGL ES version because this is important.

So how to check the OpenGL ES version?

  1. By using SystemService. This is the simplest one. You don't need to create any OpenGL ES component.
    final ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
    final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();
    final boolean supportsEs2 = configurationInfo.reqGlEsVersion >= 0x30000;
  2. By using glGetService. By doing this, you can get more information, like the vendor, chip, shading version, etc. But, you need to have GL context first.
    String glVersion = GLES20.glGetString(GLES20.GL_VERSION);
    String glRenderer = GLES20.glGetString(GLES20.GL_RENDERER);
    String glVendor = GLES20.glGetString(GLES20.GL_VENDOR);
    String glShadingLanguageVersion = GLES20.glGetString(GLES20.GL_SHADING_LANGUAGE_VERSION);
    String glExtensions = GLES20.glGetString(GLES20.GL_EXTENSIONS);

Comments

Post a Comment

Popular posts from this blog

Play video inside OpenGL ES by using MediaCodec

In Android 4.1 (API 16) and above, MediaCodec is introduced by Android. By using MediaCodec, we can easily decode video without using Android NDK, like creating video playback application, etc. In game development, video is also needed to make the game environment more realistics, like when you are playing a racing game with video banner around the track. In here, I'll introduce of how to decode the video and render it into OpenGL ES. Firstly, we prepare some stuffs to decode the video, like MediaExtractor and MediaCodec. private boolean initExtractor() { extractor = new MediaExtractor(); try { extractor.setDataSource(mFilePath); } catch (IOException e) { return false; } // get video track for (int i = 0; i < extractor.getTrackCount(); i++) { MediaFormat format = extractor.getTrackFormat(i); String mime = format.getString(MediaFormat.KEY_MIME); if (mime.startsWith("video/")) {
Read more

Using AssetManager on native language JNI, C++

#include <sstream> #include <assert.h> // include in android platform-9 or newer #include <android/asset_manager.h> #include <android/asset_manager_jni.h> ... JNIEXPORT void JNICALL Java_com_yourpackage_yourfunctionname(JNIEnv *env, jclass clazz, jobject assetManager) {     // get assetmanager native     AAssetManager* mgr = AAssetManager_fromJava(env, assetManager);     assert(mgr != NULL);     // load file inside assets, "assets/a/b.txt"     AAsset* asset = AAssetManager_open(mgr, "a/b.txt", AASSET_MODE_UNKNOWN);     assert(asset != NULL);     // get buffer of file     char* buff = (char*) AAsset_getBuffer(asset);     assert(buff != NULL);     // print out buffer per line     const int MAX_BUF = 512;     char strbuf [MAX_BUF];     std::istringstream iss(buff);     while ( iss.getline(strbuf, MAX_BUF) )         LOGE("%s", strbuf);     AAsset_close(asset); }
Read more

[iOS] Custom back button with back gesture

Image
When I want to change the default iOS back button, I need to hide the default back button. This causes the back gesture is also disabled. Therefore, I need to keep the back gesture and make the change. To make these happen, I do steps: Disable the default back button Set the new back button to left bar item Enable the navigation interaction gesture for back gesture Here is the codes (Swift 5) class MyViewController: UIGestureRecognizerDelegate { self.navigationItem.hidesBackButton = true let image = UIImage(systemName: "chevron.backward") let backBarItem = UIBarButtonItem(image: image, style: .plain, target: nil, action: nil) self.navigationItem.leftBarButtonItem = backBarItem self.navigationController?.interactivePopGestureRecognizer?.delegate = self func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool { return true } }
Read more