openGLES3.0Example_6_VertexBufferObjects.rar

openGLES顶点缓冲使用顶点缓冲对象顶点缓冲对象vertexbuff

使用顶点数组指定的顶点数据存储在客户端内存中。此数据必须从客户端内存复制到图形内存时绘制调用，如glDrawArrays或glDrawElements。和光栅化。” 然而，如果我们不这样做会好得多在每个绘制调用上复制顶点数据，但可以缓存图形存储器中的数据。这种方法可以显著地改进同时也降低了内存带宽和渲染性能功耗要求，这两者都是非常重要的手持设备。这就是顶点缓冲对象可以提供帮助的地方。顶点缓存对象允许OpenGL ES 3.0应用程序分配和缓存顶点数据在高性能图形内存和渲染从这内存，从而避免每次绘制原语时重新发送数据。不仅是顶点数据，还有用来描述的元素索引原语的顶点索引，并作为参数传递给 glDrawElements，可以被缓存。 OpenGL ES 3.0支持两种类型的缓冲对象指定顶点和原始数据:数组缓冲对象和元素数组缓冲区对象。 GL_ARRAY_BUFFER指定的数组缓冲区对象令牌用于创建存储顶点数据的缓冲区对象。的 GL_ELEMENT_ARRAY_BUFFER指定的元素数组缓冲区对象顶点缓冲对象141 令牌用于创建存储原语索引的缓冲区对象。 OpenGL ES 3.0中的其他缓冲区对象类型将在本文的其他部分进行描述关注用于指定顶点的缓冲对象属性和元素数组。注意:为了获得最好的性能，我们建议使用OpenGL ES 3.0 应用程序为顶点属性数据和元素指标。在我们可以使用缓冲区对象渲染之前，我们需要分配缓冲对象，并上传顶点数据和元素索引到合适的缓冲区对象

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