import com.google.vr.sdk.base.Viewport; //导入依赖的package包/类
@Override
public void onFinishFrame(Viewport viewport) {
}
 

import com.google.vr.sdk.base.Viewport; //导入依赖的package包/类
@Override
public void onFinishFrame(Viewport viewport) {}
 

import com.google.vr.sdk.base.Viewport; //导入依赖的package包/类
@Override
    public void onDrawEye(Eye eye) {
        Viewport curView = eye.getViewport();
        Viewport initViewport = new Viewport();
        initViewport.setViewport(curView.x, curView.y, curView.width, curView.height);

        FieldOfView curFov = eye.getFov();
        FieldOfView initFov = new FieldOfView(curFov.getLeft(), curFov.getRight(), curFov.getBottom(), curFov.getTop());

        // Change to camera resolution for scene render
        eye.getViewport().setViewport(0, 0, mPreviewSize.getWidth(), mPreviewSize.getHeight());
        eye.getFov().setAngles((float)mFov.x / 2.0f, (float)mFov.x / 2.0f, (float)mFov.y / 2.0f, (float)mFov.y / 2.0f);
        eye.getViewport().setGLViewport();
        eye.getViewport().setGLScissor();
        eye.setProjectionChanged();

        // Apply the eye transformation to the camera.
        float[] viewMat = new float[16];
        Matrix.multiplyMM(viewMat, 0, eye.getEyeView(), 0, mCamera, 0);
        // Get the perspective matrix for 3D objects rendering
        // Create FOV identical to physical
        float[] perspective = new float[16];
        perspective = eye.getPerspective(Z_NEAR, Z_FAR);
        //Matrix.perspectiveM(perspective, 0, (float)mFov.y, (float)mPreviewSize.getWidth() / (float)mPreviewSize.getHeight(), Z_NEAR, Z_FAR);
//        FieldOfView physFov = new FieldOfView((float)mFov.x, (float)mFov.x, (float)mFov.y, (float)mFov.y);
//        physFov.toPerspectiveMatrix(Z_NEAR, Z_FAR, perspective, 0);

        // First draw object scene texture through frame buffer
        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, mFboIdObjects);
        if (eye.getType() == Eye.Type.LEFT) {
            GLES20.glClearColor(1.0f, 0.0f, 0.0f, 0.0f);
        } else {
            GLES20.glClearColor(0.0f, 0.0f, 1.0f, 0.0f);
        }
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        GLES20.glEnable(GLES20.GL_DEPTH_TEST);
        //GLES20.glViewport(0, 0, mPreviewSize.getWidth(), mPreviewSize.getHeight());
        //GLES20.glViewport(0, 0, 100, 100);

        drawObjects(viewMat, perspective);

        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, DEFAULT_FBO_ID);

        // Change back to initial res
        eye.getViewport().setViewport(initViewport.x, initViewport.y, initViewport.width, initViewport.height);
        eye.getFov().setAngles(initFov.getLeft(), initFov.getRight(), initFov.getBottom(), initFov.getTop());
        eye.getViewport().setGLViewport();
        eye.getViewport().setGLScissor();
        eye.setProjectionChanged();

        // Recalculate the perspective matrix for vr view
        perspective = eye.getPerspective(Z_NEAR, Z_FAR);
       // Matrix.perspectiveM(perspective, 0, eye.getFov().getTop(), (float)eye.getViewport().width / (float)eye.getViewport().height, Z_NEAR, Z_FAR);

        // Now draw actual screen for cardboard viewer
        GLES20.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        GLES20.glEnable(GLES20.GL_DEPTH_TEST);
        //eye.getViewport().setGLViewport();

        screenRenderer.draw(viewMat, perspective);
    }
 

import com.google.vr.sdk.base.Viewport; //导入依赖的package包/类
@Override
public void onFinishFrame(Viewport viewport) {
    //no clue, example code was blank here.
}
 

import com.google.vr.sdk.base.Viewport; //导入依赖的package包/类
@Override
public void onFinishFrame(Viewport viewport) {
    //we are not doing anything after the drawing, but before the display, so nothing here.
}