如何绘制纹理圆opengl-es？

// 定义圆的顶点数组
float[] circleVertices = { 0.0f, 0.0f, 0.0f };
int numSegments = 360;
float angleStep = (float) (2.0 * Math.PI / numSegments);
for (int i = 0; i <= numSegments; i++) {
    float angle = i * angleStep;
    float x = (float) Math.cos(angle);
    float y = (float) Math.sin(angle);
    circleVertices = Arrays.copyOf(circleVertices, circleVertices.length + 2);
    circleVertices[circleVertices.length - 2] = x;
    circleVertices[circleVertices.length - 1] = y;
}

// 创建纹理坐标数组
float[] textureCoords = new float[circleVertices.length];
for (int i = 0; i < circleVertices.length; i += 2) {
    textureCoords[i] = (circleVertices[i] + 1.0f) / 2.0f;
    textureCoords[i + 1] = (circleVertices[i + 1] + 1.0f) / 2.0f;
}

// 加载纹理图像
Bitmap textureBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.texture);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, textureBitmap, 0);

// 创建纹理对象
int[] textureIds = new int[1];
GLES20.glGenTextures(1, textureIds, 0);
int textureId = textureIds[0];
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);

// 设置纹理参数
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);

// 绘制圆
FloatBuffer vertexBuffer = ByteBuffer.allocateDirect(circleVertices.length * 4)
        .order(ByteOrder.nativeOrder())
        .asFloatBuffer()
        .put(circleVertices);
vertexBuffer.position(0);

FloatBuffer textureBuffer = ByteBuffer.allocateDirect(textureCoords.length * 4)
        .order(ByteOrder.nativeOrder())
        .asFloatBuffer()
        .put(textureCoords);
textureBuffer.position(0);

// 绑定顶点坐标和纹理坐标
int positionHandle = GLES20.glGetAttribLocation(program, "aPosition");
int textureCoordHandle = GLES20.glGetAttribLocation(program, "aTextureCoord");
GLES20.glEnableVertexAttribArray(positionHandle);
GLES20.glVertexAttribPointer(positionHandle, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);
GLES20.glEnableVertexAttribArray(textureCoordHandle);
GLES20.glVertexAttribPointer(textureCoordHandle, 2, GLES20.GL_FLOAT, false, 0, textureBuffer);

// 绘制圆
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_FAN, 0, circleVertices.length / 2);

// 解绑顶点坐标和纹理坐标
GLES20.glDisableVertexAttribArray(positionHandle);
GLES20.glDisableVertexAttribArray(textureCoordHandle);