无法让opengl ES在Android上以2D绘制任何内容
这是我写的代码,目的是让2D绘图正常工作。活动、视图和渲染器的设置方式正确。我有一个完全黑色的屏幕,但没有多边形。没有画任何东西。这会让我发疯的无法让opengl ES在Android上以2D绘制任何内容,android,opengl-es,2d,Android,Opengl Es,2d,这是我写的代码,目的是让2D绘图正常工作。活动、视图和渲染器的设置方式正确。我有一个完全黑色的屏幕,但没有多边形。没有画任何东西。这会让我发疯的 public class OpenGLActivity extends Activity { private GLSurfaceView surfaceView; /** Called when the activity is first created. */ @Override public void onCre
public class OpenGLActivity extends Activity {
private GLSurfaceView surfaceView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN
);
this.surfaceView = new OpenGLSurfaceView(this);
setContentView(this.surfaceView);
}
@Override
protected void onPause() {
super.onPause();
surfaceView.onPause();
}
@Override
protected void onResume() {
super.onResume();
surfaceView.onResume();
}
}
public class OpenGLSurfaceView extends GLSurfaceView {
private OpenGLSurfaceRenderer renderer;
public OpenGLSurfaceView(Context context) {
super(context);
this.renderer = new OpenGLSurfaceRenderer();
setRenderer(renderer);
}
}
public class OpenGLSurfaceRenderer implements Renderer {
private FloatBuffer vertexBuffer;
private float[] vertices = {
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f,
1.0f, 0.0f, 0.0f,
0.0f, 10.0f, 0.0f,
0.0f, 0.0f, 0.0f,
10.0f, 10.0f, 0.0f,
10.0f, 0.0f, 0.0f
};
public OpenGLSurfaceRenderer() {
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(vertices.length * (Float.SIZE >> 3));
vertexBuffer = byteBuffer.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glClearColor(0.0f, 0.0f, 0.0f, 1);
gl.glShadeModel(GL10.GL_FLAT);
gl.glDisable(GL10.GL_DEPTH_TEST);
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glDisable(GL10.GL_DITHER);
gl.glDisable(GL10.GL_LIGHTING);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
}
public void onDrawFrame(GL10 gl) {
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
gl.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
gl.glTranslatef(0.0f, 0.0f, 0.5f);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
// Clear the projection matrix
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
// Set up orthographic projection mode (2D drawing)
gl.glOrthof(0, width, height, 0, 0, 1);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
}
我看到四个问题:
byteBuffer.order(ByteOrder.nativeOrder());您的活动代码在哪里?…实例化一个GLSURFACHEVIEW并将其渲染器设置为OpenGLSURFACHERENDERER,添加了我的活动和视图代码。我有8个顶点的原因是,我试图创建一个1x1的矩形和另一个10x10像素宽的矩形。我将它们添加到同一个vertexBuffer以便能够在两者之间切换n然后很容易。我也尝试过画一个100x100,我使用了负坐标值,但仍然没有结果。如果我更改了gl.glClearColor,我的屏幕上会出现另一种颜色,所以OpenGL似乎做了些什么。我看到你启用了纹理,但没有做任何纹理。建议删除gl.glEnable(GL10.gl\u TEXTURE\u 2D);或将其更改为glDisable。哦,看,您还将沿Z方向每帧前进0.5个单位。因此,在两帧之后,您将根本看不到任何内容。尝试注释gl.glTranslatef(0.0f,0.0f,0.5f),但没有运气,我还认为转换矩阵没有应用于顶点缓冲区内存,而是仅由openGL应用“引擎盖下”。