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Patrick Mours 9066f2e043 Cycles: Add support for OSL texture intrinsic on the GPU ...

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

2023-01-19 19:14:48 +01:00

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