EGLRender texture position use FboTexCoors #3
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在NDK OpenGL ES 3.0 开发（五）：FBO 离屏渲染中讲到，使用 FBO 进行离屏渲染时，采样时纹理的原点位于屏幕左下角。
那么在 EGLRender 的例子中，使用 FBO 离屏渲染时，直接使用 vFboTexCoors 对纹理进行采样，在 APP 中也不需要再对 buffer 进行镜像操作。