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make NEG update flags correctly (oops).

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also misc graphics notes added.
This commit is contained in:
StapleButter
2017-03-06 18:13:57 +01:00
parent 52d866fa17
commit 383093c5ff
3 changed files with 13 additions and 9 deletions
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5
GPU2D.cpp
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@ -54,7 +54,8 @@
//
// 3D/2D blending rules
// * if destination selected as 2nd target:
// blending is applied instead of the selected color effect, using full 31bit alpha from 3D layer
// blending is applied instead of the selected color effect, using full 5bit alpha from 3D layer
// (or 6bit alpha? TODO: check it)
// this even if the selected color effect is 'none'.
// apparently this works even if BG0 isn't selected as 1st target
// * if BG0 is selected as 1st target, destination not selected as 2nd target:
@ -231,7 +232,7 @@ void GPU2D::Write16(u32 addr, u16 val)
EVB = (val >> 8) & 0x1F;
if (EVB > 16) EVB = 16;
return;
case 0x54:
case 0x054:
EVY = val & 0x1F;
if (EVY > 16) EVY = 16;
return;