GTA SA is a great game, but it has some problems. This little plugin solves a few of them. It focuses mainly on fixing bugs that are present on PC but not on the PS2 version of the game.
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TwoPassRendering - Enables experimental two-pass rendering for objects with alpha. It will significantly improve the way alpha is applied and solve most of the so-called "alpha bugs". HOWEVER, it can introduce a few other bugs AND have a negative impact on performance. Setting this option to 1 will enable Silent's double pass, solving vegetation blending issues but causing more rendering bugs. Setting this option to 2 will enable aap's (The Hero) double pass, meant to emulate PS2's way of accessing transparent pixels (has less bugs, but doesn't completely solve vegetation problems)