Garbled textures when using bilinear texture filtering at native res

[shugowah]

When using bilinear texture filtering with every other option set to native/default (recreating playing PS1 titles on a PS2 with the texture smoothing toggled on), textures become noisy and strangely over-sharpened. If set to 2x internal res or higher, bilinear filtering behaves properly. Tested across lots of different 3D PS1 titles with the same results.

Swanstation, Vulkan renderer, all native settings

Swanstation, Vulkan renderer, native res w/ bilinear texture filtering (broken)

Swanstation, Vulkan renderer, 2x internal res w/ bilinear texture filtering (works fine)

Beetle HW, Vulkan renderer, native res w/bilinear filtering (for comparison)