我正在尝试使用OpenGL ES 2.0在Android上批量绘制一堆线条,我需要知道最佳的方法。
现在我创建了一个名为LineEngine的类,该类构建了一个包含所有要绘制顶点的FloatBuffer,然后一次性绘制所有线条。问题是,显然FloatBuffer.put()非常慢,会消耗大量CPU时间。
这是我的类:
public class LineEngine {
private static final float[] IDENTIY = new float[16];
private FloatBuffer mLinePoints;
private FloatBuffer mLineColors;
private int mCount;
public LineEngine(int maxLines) {
Matrix.setIdentityM(IDENTIY, 0);
ByteBuffer byteBuf = ByteBuffer.allocateDirect(maxLines * 2 * 4 * 4);
byteBuf.order(ByteOrder.nativeOrder());
mLinePoints = byteBuf.asFloatBuffer();
byteBuf = ByteBuffer.allocateDirect(maxLines * 2 * 4 * 4);
byteBuf.order(ByteOrder.nativeOrder());
mLineColors = byteBuf.asFloatBuffer();
reset();
}
public void addLine(float[] position, float[] color){
mLinePoints.put(position, 0, 8); //These lines
mLineColors.put(color, 0, 4); // are taking
mLineColors.put(color, 0, 4); // the longest!
mCount++;
}
public void reset(){
mLinePoints.position(0);
mLineColors.position(0);
mCount = 0;
}
public void draw(){
mLinePoints.position(0);
mLineColors.position(0);
GraphicsEngine.setMMatrix(IDENTIY);
GraphicsEngine.setColors(mLineColors);
GraphicsEngine.setVertices4d(mLinePoints);
GraphicsEngine.disableTexture();
GLES20.glDrawArrays(GLES20.GL_LINES, 0, mCount * 2);
GraphicsEngine.disableColors();
reset();
}
}
有没有更好的方法将所有这些行批处理在一起?
GLSurfaceView
,那么它很可能会自行决定帧率。 - Michael Slade