It is possible to have holes in the shader emitter's sampler_target array.
0 sampler_target does not necessarily mean there is no sampler view
specified since texture buffer target has the value 0.
With this patch, a sampler_view array is added to the shader emitter structure
to specify if there is a sampler view for each texture unit. Only if there
is a sampler view, we will emit constant for texcoord scale factor or texture
buffer size for that sampler view.
Fixes a rendering issue with Turbine after commit 1020e960440.
Reviewed-by: Brian Paul <brianp@vmware.com>
Charmaine Lee
3c71c42827