Add bilinear filtering plus filter from VBA to gpSP

[133794m3r]

As stated above the bilinear filtering plus from VBA makes the games look slightly better than the default bilinear filter. The source code in VBA is C++ but it seems to be (the filter itself) to be pure C(to me at least.) The project page is below, and below that is a direct link to the source code itself. http://sourceforge.net/projects/vbam/

http://vbam.svn.sourceforge.net/viewvc/vbam/trunk/src/filters/bilinear.cpp?revision=1195&view=markup

As you can see the code itself looks to be identical to C, so it shouldn't be that hard to add this filter to the bilinear filter used in the gcw. I've not been able to get the emulator to take a screenshot when the screen is blown up 2x(easily) bu tit definitely looks better than stock bilinear filtering.

[pcercuei]

This won't happen, for several reasons:

• the current filter used in gpSP is extremely fast and optimized, while the "bilinear filter plus" looks really slow
• It is meant to work with 32-bit images while gpSP renders in 16-bit
• I highly doubt it can lead to a better picture quality knowing the very small resolution of the A320 and the GCW0.

[133794m3r]

I didn't realize the gpsp renders them in 16bit... then yeah it's useless. You can close this, or I'll close it. Either way it's kinda useless. I'll wait till video's out, and once that's out, hopefully you can add hq4x scaler+bilinear together so the hdmi out looks good.