在Android中使用OpenGL显示相机预览图像时,可以使用glTexSubImage2D
函数将图像数据传递给纹理。然而,当相机使用CameraX
库并且配置为使用TextureView
作为预览视图时,需要使用GL_TEXTURE_EXTERNAL_OES
纹理目标。
以下是一个示例代码,演示了如何在Android中使用OpenGL、OpenCV和CameraX来解决这个问题:
build.gradle
文件中添加以下依赖项:implementation 'androidx.camera:camera-core:1.0.0'
implementation 'androidx.camera:camera-camera2:1.0.0'
implementation 'org.opencv:opencv-android:4.5.3'
implementation 'org.opencv:opencv-core:4.5.3'
implementation 'org.opencv:opencv-java:4.5.3'
AndroidManifest.xml
文件中添加相机和权限的权限声明:
activity_main.xml
中添加一个TextureView
作为相机预览视图:
MainActivity.java
中实现相机预览和OpenGL渲染的逻辑:import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.core.content.ContextCompat;
import android.graphics.SurfaceTexture;
import android.opengl.GLES11Ext;
import android.opengl.GLES20;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.util.Size;
import android.view.TextureView;
import com.google.common.util.concurrent.ListenableFuture;
import org.opencv.android.OpenCVLoader;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
public class MainActivity extends AppCompatActivity {
private TextureView textureView;
private GLSurfaceView glSurfaceView;
private SurfaceTexture surfaceTexture;
private int cameraTextureId = -1;
static {
if (!OpenCVLoader.initDebug()) {
// Handle initialization error
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textureView = findViewById(R.id.textureView);
glSurfaceView = findViewById(R.id.glSurfaceView);
glSurfaceView.setEGLContextClientVersion(2);
glSurfaceView.setRenderer(new MyRenderer());
}
@Override
protected void onResume() {
super.onResume();
ListenableFuture cameraProviderFuture = ProcessCameraProvider.getInstance(this);
cameraProviderFuture.addListener(() -> {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
bindCameraPreview(cameraProvider);
} catch (Exception e) {
// Handle error
}
}, ContextCompat.getMainExecutor(this));
}
private void bindCameraPreview(ProcessCameraProvider cameraProvider) {
int width = textureView.getWidth();
int height = textureView.getHeight();
surfaceTexture = new SurfaceTexture(createOESTexture());
surfaceTexture.setDefaultBufferSize(width, height);
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build();
ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
.setTargetResolution(new Size(width, height))
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();
imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(this), new ImageAnalysis.Analyzer() {
@Override
public void analyze(ImageProxy image) {
// Process the image using OpenCV
// ...
// Update the OpenGL texture with the processed image
updateTexture(image);
image.close();
}
});
cameraProvider.unbindAll();
cameraProvider.bindToLifecycle(this, cameraSelector, imageAnalysis);
}
private void updateTexture(ImageProxy image) {
image.getPlanes()[0].getBuffer().rewind();
byte[] data = new byte[image.getPlanes()[0].getBuffer().remaining()];
image.getPlanes()[0].getBuffer().get(data);
surfaceTexture.attachToGLContext(cameraTextureId);
surfaceTexture.updateTexImage();
surfaceTexture.detachFrom