[转] 读取屏幕像素点的方法

Cocos2d-x
#1

http://discuss.cocos2d-x.org/t/how-to-get-image-pixel-at-a-specified-location/34208/6

auto pixelPos = CC_POINT_POINTS_TO_PIXELS(center);

cmd = new CustomCommand();

cmd->func = [=]() {
	glPixelStorei(GL_PACK_ALIGNMENT, 1);
	glReadPixels(pixelPos.x, pixelPos.y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixel);
};

rt->beginWithClear(0, 0, 0, 0);
spr1->visit();
_director->getRenderer()->addCommand(cmd);
rt->end();