[c64] Micro64 1.00.2012.06.26 Build 694

Micro64 Version: 1.00.2012.06.26 Build 694 SVN revision: 2311

Date: 26. June 2012 Time: 15:36 UTC

• Optimized VIC NMOS glitch GLSL shader pass in the new PAL full emulation, removed branches and replaced it with branch-less max/step/sign function chains, and reduced texture lookups from 9 to 5 down per output pixel for some weaker but still good midrange or highend graphics cards, because when Y/luminance is going from high to low, the transition is relativly fast (about 0.5 VIC pixels), and when Y/luminance is going from low to high, the transition is relativly slow (about 2 VIC pixels), and because the PAL emulator works in 768 texture pixel width resolution instead 384, so all widths are 2x width, 0.5*2=1 texel and 2*2=4 texels, so more than 5 texel (4 + 1 for the initial Y state for the VIC NMOS glitch emulation algorithm) texture lookups are not necessary here.
• Replaced the blackman-exact window with an dolph-chebyshev window of the three (YUV) 17-tap windowed SINC FIR lowpass filters in the PAL signal bandwidth filter GLSL shader pass for to fix some small optical issues.
• Reduced multiplication operations to the half in the PAL signal bandwidth filter GLSL shader pass, since the SINC lowpass filter kernel coefficient values in the PAL emulator in micro64 are symmetrical, so one vec3 filter coefficients multiplication per two texture lookups (one per each half direction) now instead two vec3 filter coefficients multiplications per each texture lookup.
• Removed a waste additional plain-from-FBO-texture-A-to-FBO-texture-B-copy shader pass. It was only for debugging usages but I've forgot to remove it in the release builds.