Previously, if the TextureManager was recreated, e.g. when changing the texture paths, all loaded textures were deleted, even if currently in use by a preset. Storing textures and samplers as shared pointers instead of weak pointers will make sure the objects are kept alive until the preset is unloaded.
Signed-off-by: Kai Blaschke <kai.blaschke@kb-dev.net>
If a preset uses different long-form samplers for a single random slot, this will result in a failure, e.g. using both "sampler_rand00_something" and "sampler_rand00_else". As this also isn't supported by Milkdrop and would create a conflict situation, we don't care.
Use the same basic logic as Milkdrop. Also automatically declare a shorthand "texsize_randXX" uniform for prefixed random texture names as preset authors expect.
Fixed a transpile issue with a hack used by some preset authors to set a texture sampler to a different filter/wrap mode, removing the "sampler_state" block entirely now as there's no GLSL equivalent (samplers are solely configured on the application side).
Also consolidated a few vertex types into RenderItem and fixed a few old-school effects like DarkenCenter.
Moved per-pixel mesh texture coordinate calculations into the vertex shader. This is probably more performant than the SSE2 code in the old PresetFrameIO class, as the GPU is better at running this stuff in parallel.
All the texture management also needs some refactoring, so now that I've already broken everything, I can just do it as well.
