Custom PPSSPP shaders

[LunaMoo]

It's not blur, upscaling post process effects apply to what you see each frame not to the textures like texture scaling which then never change, so when a non-animated object like background is moving on the screen, you will see the effect being re-made each pixel moves and since the pixel location is then different, the effect is slightly different as well.

It's just one of the downside of using upscaling post process effects we have to live in(another would be effects that resize textures, like for example explosions in some 2D games), but it's not actually blur, if you record a video of it and then watch it frame by frame you will see none of those frames are actually "blurry", they're just slightly different.