OSG初始化深度贴图的代码

//本来的colorTexture是颜色采样,无法显示深度,这里换成深度贴图
	colorTexture = new Texture2D;
	colorTexture->setTextureSize(width, height);
	colorTexture->setSourceFormat(GL_DEPTH_COMPONENT);
	colorTexture->setSourceType(GL_FLOAT);
	colorTexture->setInternalFormat(GL_DEPTH_COMPONENT24);
	colorTexture->setFilter(Texture2D::MIN_FILTER, Texture2D::NEAREST);
	colorTexture->setFilter(Texture2D::MAG_FILTER, Texture2D::NEAREST);
	colorTexture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
	colorTexture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);

// 在缓存到贴图时, 像机声明缓存的内容是深度, 但颜色也是能够的
	cameraLight->attach(Camera::DEPTH_BUFFER/*Arcadia test 2019-04-11 COLOR_BUFFER或DEPTH_BUFFER均可以*/
		, colorTexture.get(), 0, 0, false,
		0, 0);