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→Emulation issues: https://github.com/PCSX2/pcsx2/pull/10853
Another big problem is the emulation of PlayStation 2’s floating-point unit (FPU) because it doesn’t follow the IEEE standard. To keep it simple, just changing a couple of numbers will cause glitches to occur to the game’s graphic (VU) and logic (EE), resulting in things like broken AI, odd behaviors, and/or graphical bugs. While PCSX2 allows for either clamping/rounding on both VU and EE as a solution to fix these glitches, it remains by far not the most accurate way to emulate the PlayStation 2's FPU.<ref>https://wiki.pcsx2.net/PCSX2_Documentation/Nightmare_on_Floating-Point_Street</ref><ref>https://github.com/PSI-Rockin/DobieStation/issues/51</ref>
To conclude the problems with PlayStation 2 emulation, we come to hardware rendering. The PlayStation 2’s graphics pipeline acts very differently from modern GPU cards, and emulating it in HW mode with any degree of accuracy is difficult. This is due in part to the versatility of the PlayStation 2, the fact that it doesn’t use fixed shaders, or that even the games themselves do not use a consistent formula to achieve different graphical effects. Various emulation enhancements like display resolution scaling lead to the typical “black lines glitch” because of the use of a non-integer resolution. While the [https://github.com/PCSX2/pcsx2/tree/master/pcsx2/GS/Renderers Vulkan and OpenGL renderer backends on PCSX2] greatly improved on many of these issues, [https://wiki.pcsx2.net/Category:Software_rendering_only_games lots of games still require “software rendering”] to fix many common glitches, which is [[PCSX2#System_requirements|significantly increases CPU ST performance requirement]] for the emulation and eliminating visual enhancement options. Always try Vulkan or OpenGL backends first because D3D backends blending levels is quite problematic compared to other backends.<ref>[https://github.com/PCSX2/pcsx2/pull/9952 PCSX2 devs comment about HW backends]</ref>
In summary, The PlayStation 2 is a very complex machine that even game developers struggled to work with. It is difficult to achieve close-to-perfection PlayStation 2 emulation with actual PC hardware but thanks to [https://github.com/PCSX2/pcsx2/graphs/contributors PCSX2 team] it's now possible.
