<dl class="switch">

<dt class="switch">If |layout| is {{XRLayerLayout/"stereo-left-right"}}:

<dd> Set |viewport|'s {{XRViewport/x}} to the pixel width of |texture| multiplied by |offset| and divided by |num|.

<dt class="switch">Else if |layout| is {{XRLayerLayout/"stereo-top-bottom"}}:

<dd> Set |viewport|'s {{XRViewport/y}} to the pixel height of |texture| multiplied by |offset| and divided by |num|.

<dd> Set |viewport|'s {{XRViewport/height}} to the pixel height of |subimage|'s |texture| divided by |num|.

<dt> Otherwise

<dd> Let |index| be the offset of |view|'s [=view=] in |session|'s [=list of views=] excluding the [=secondary view|secondary views=].

</dl>

1. Initialize |subimage|'s {{XRWebGLSubImage/colorTexture}} as follows:

<dl class="switch">

<dt> If |view| is a [=secondary view=] from |session|'s [=list of views=]

<dd> Initialize |subimage|'s {{XRWebGLSubImage/colorTexture}} with the element at offset |index| of the |layer|'s [=XRProjectionLayer/colorTextures for secondary views=].

<dd> Initialize |subimage|'s {{XRWebGLSubImage/colorTexture}} with the first element of the |layer|'s [=colorTextures=] array.

<dt> Otherwise

<dd> Initialize |subimage|'s {{XRWebGLSubImage/colorTexture}} with the element at offset |index| of the |layer|'s [=colorTextures=] array.

</dl>

1. Initialize |subimage|'s {{XRWebGLSubImage/depthStencilTexture}} as follows:

<dl class="switch">

<dt> If the |layer|'s [=depthStencilTextures=] is an empty array.

<dd> Initialize |subimage|'s {{XRWebGLSubImage/depthStencilTexture}} with <code>null</code>.

<dt> Else if |view| is a [=secondary view=] from |session|'s [=list of views=]

<dd> Initialize |subimage|'s {{XRWebGLSubImage/colorTexture}} with the element at offset |index| of the |layer|'s [=XRProjectionLayer/depthStencilTextures for secondary views=].

<dd> Initialize |subimage|'s {{XRWebGLSubImage/depthStencilTexture}} with the first element of |layer|'s [=depthStencilTextures=] array.

<dt> Otherwise

<dd> Initialize |subimage|'s {{XRWebGLSubImage/depthStencilTexture}} with the element at offset |index| of the |layer|'s [=depthStencilTextures=] array.