9066f2e043
This makes it possible to use `texture` and `texture3d` in custom OSL shaders with a constant image file name as argument on the GPU, where previously texturing was only possible through Cycles nodes. For constant file name arguments, OSL calls `OSL::RendererServices::get_texture_handle()` with the file name string to convert it into an opaque handle for use on the GPU. That is now used to load the respective image file using the Cycles image manager and generate a SVM handle that can be used on the GPU. Some care is necessary as the renderer services class is shared across multiple Cycles instances, whereas the Cycles image manager is local to each. Maniphest Tasks: T101222 Differential Revision: https://developer.blender.org/D17032
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