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quickly tested this on few games. ACE: Click to expand
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So far, Lego Star Wars was the toughest case for me. We did talk briefly about rounding - maybe the final fix is two-fold? Offsetting the center, and then some rounding magic? |
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| switch(nRegister) | ||
| { | ||
| case GS_REG_ST: | ||
| m_nReg[nRegister] &= 0xFFFFFF00FFFFFF00; |
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These (ST) are floating point values. Does it makes sense to mask out the last 8 bits of these values?
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Yep, thats what the GS manual explicitly states.
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According to the GS manual, the 8 lower bits of S and T of GS_REG_ST must be rounded down. This commit just masks them away, which just serves that purpose.
The PS2 assumes the 0,0 pixel at the center of the screen. OpenGL (at least) assumes the 0,0 pixel at the top left. When the screen width/height is even, this causes a slight discrepancy.
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Didn't know what to call this PR - it fixes quite a bit more then than the title suggests.
The PS2 assumes the 0,0 pixel at the center of the screen. OpenGL (at least) assumes the 0,0 pixel at the top left. When the screen width/height is even, this causes a slight discrepancy of half a pixel.
In all games I tested this yields very neat results, and fixes all kinds of slight visual artifacts. For me, notable text rendering and text boxes in Suikoden 5, as well as briefings in Ring of Red.
This needs more testing with different games. Together with #895, this fixes most visual problems of the games that start for me. But for cleanness purposes, the following screenshots are without the fixes in #895.
Lego Star Wars II
Click to expand!
This issue is only visible in tandem with #895, so differences are show to this PR here!
Ring of Red
Click to expand!
Suikoden 5
Click to expand!
Look especially at the question mark at the bottom!