I choose to apply this mainly to combat the extremely apparent dithering effect which a great many PlayStation games utilise. The in-game screen grabs included in this post all feature a degree of smoothing, which is applied by via Libretro to the emulator in the form of bilinear filtering. Libretro Menu - Core Options submenu Smoothing the Video Output with Bilinear Filtering In general, I switch the speed hacks on, and only turn them off if the emulator crashes or exhibits other glitches to see if stability improves. I’ve not found any definitive information regarding the scope and functionality of the speed hacks – indeed it is not clear if they even affect the Raspberry Pi port of the emulator. This option appears to be generally required when using the Enhanced resolution (slow) mode, although this may introduce instabilities (anecdotal, from my own experience only). The obtrusive dithering effect employed in many PlayStation titles is far less evident as the dither grid overlay is rendered in much higher resolution.īesides utilising overclocking, as mentioned previously, it is worth enabling the following option when using the enhanced resolution mode: This increases the resolution of the 3D polygons, producing a far sharper image, however all 2D bitmaps and texture maps retain the original resolution. To output enhanced resolution graphics, enable the following option: Unfortunately some titles become unplayable due to the reduced framerate, whilst others, such as Doom, exhibit graphical corruptions rendering the enhanced resolution mode useless.
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With overclocking applied many titles are able to run at close to full speed, or exhibit tolerable slowdown only in very demanding sections of games in these cases often the audio suffers slight slowdown or corruption, whilst the visual fidelity is maintained. The emulator in its current form is only able to utilise one of the four CPU cores present on the Pi perhaps a future (radical) enhancement to PCSX-ReARMed will unlock the full potential of the system.Īll is not lost, however, and gaining additional processing power by running the Pi with maximum stable overclocking is definitely recommend – see my earlier posts on this topic for information on enabling and testing overclocking: Overclocking and Stability Testing the Raspberry Pi 2 – Part 1: Overclocking in Depth Rendering the output in enhanced resolution incurs significant processing overhead. I should note that whilst this can make stunning visual improvements to many games on the system, unfortunately the Raspberry Pi 2 lacks enough CPU power to reliably run all games at full speed. It is possible to force RetroPie’s PCSX-ReARMed PlayStation emulator to render graphics in a resolution considerably higher than the native modes available on the genuine console’s hardware. Core Options – Enhancing the Graphics Resolution Discussed here are a couple of entries within the Core Options sub menu of especial interest to PlayStation emulation. Many of the entries on the RetroArch/Libretro main menu screen lead to sub menus, most of which contain numerous entries, and further sub menus. This post builds upon the information in the preceding article PlayStation Emulation on the Pi: Enhancing the Experience with the Options Menu – Part One: Basic Features and Save States, and the introductory piece entitled RetroPie Emulation: RetroArch, Libretro, and the Power of the Options Menu.
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