Android相机预览无法通过SurfaceTexture正常工作

Question

I am trying to draw a camera preview on Android via openGL. Preview texture is obtain as external EGL image through SurfaceTexture and then I draw it using a fairly simple shader:

#extension GL_OES_EGL_image_external : require
precision mediump float;
uniform samplerExternalOES sTexture;
varying vec2 texCoord;
    void main() {
    gl_FragColor = texture2D(sTexture,texCoord);
}

On nexus 5 it's working for all the preview images up to 1280x960. However for the biggest 2: 1920x1080 and 1600x1200 the screen is just blank. I set preview size in my camera obtained via camera.getSupportedPreviewSizes , so I am not trying to set anything which is unsupported by the camera.

    public  List<Camera.Size>  getSupportedResolutions()
    {
        List<Camera.Size> previewSizes = mCamera.getParameters().getSupportedPreviewSizes();
        List<Camera.Size> pictureSizes = mCamera.getParameters().getSupportedPictureSizes();

        pictureSizes.retainAll(previewSizes);

        return pictureSizes;
    }

 private void setResolution(int position)
    {
        List<Camera.Size> res = getSupportedResolutions();

        Camera.Parameters p =  mCamera.getParameters();
        p.setPictureSize(res.get(position).width, res.get(position).height);
        p.setPreviewSize(res.get(position).width, res.get(position).height);

        mCamera.setParameters(p);
    }

any suggestion what might go be wrong with those resolutions? maybe some kind of size limit in opengl?

Answer 1

I figured the problem. if preview size is larger than the size of my surfaceView I just set improper viewport. clamping it by (0, screenW) , (0, screenH) fixes the problem. There is no separate limit for external images, that was fully my fault