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image_storage_slice(3) Arcan Lua API image_storage_slice(3) NAME image_storage_slice - SYNOPSIS true or false image_storage_slice( vid:store int:type vidtbl:slices ) DESCRIPTION Some rendering effects require specialised storage layouts that we refer to as 'sliced', from the fact that they represent slices of some geometry. Typical such layouts are 'cubemaps' ( SLICE_CUBEMAP ) and '3D' textures ( SLICE_ 3D). This is not normally supported by the engine, but the backing store of a video object can irreversibly be converted to such storage for- mats with the use of this function. The function returns true if the back- ing store was successfully converted. This property will then carry through when using image_sharestorage . Calling the function multiple times with the same input set will update the slices that has a more recent upload timestamp than the previous slice in the corresponding slot. The perfor- mance characteristics of this function also vary with the underlying hard- ware platform, the source format of the individual slices and the GPU affinity of the individual slices. The default and typically worst case re- quires a full GPU -> CPU -> GPU synchronous transfer and is thus not suit- able for high rate updates. NOTES 1 the number of slices and the current backing store of store should have a power-of-two base width (height will be ignored). EXAMPLE function image_storage_slice0() local surf = alloc_surface(32, 32) local c1 = fill_surface(32, 32, 255, 0, 0) local c2 = fill_surface(32, 32, 255, 255, 0) local c3 = fill_surface(32, 32, 255, 0, 255) local c4 = fill_surface(32, 32, 255, 255, 255) local c5 = fill_surface(32, 32, 0, 255, 0) local c6 = fill_surface(32, 32, 0, 0, 255) image_storage_slice(surf, SLICE_CUBEMAP, {c1,c2,c3,c4,c5,c6}) end SEE ALSO: image August 2026 image_storage_slice(3)
NAME | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLE | SEE ALSO:
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