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melonDS
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fix extended backgrounds. blarg

This commit is contained in:
StapleButter 2017-02-03 22:58:00 +01:00
parent 410c18fac4
commit 399e30017a
1 changed files with 10 additions and 5 deletions
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15
GPU2D.cpp
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@ -228,7 +228,7 @@ void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst)
if (DispCnt & 0x0400)
{
if (bgmode == 5)
DrawBG_Extended(line, dst, 3);
DrawBG_Extended(line, dst, 2);
else if (bgmode == 4 || bgmode == 2)
{} // todo: rotscale
else
@ -454,8 +454,14 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
u16* pal;
u32 extpal;
u32 widexmask = (bgcnt & 0x4000) ? 0x10000 : 0;
u32 wideymask = ((bgcnt & 0xC000) == 0xC000) ? 0x10000 : 0;
u32 coordmask;
switch (bgcnt & 0xC000)
{
case 0x0000: coordmask = 0x07800; break;
case 0x4000: coordmask = 0x0F800; break;
case 0x8000: coordmask = 0x1F800; break;
case 0xC000: coordmask = 0x3F800; break;
}
extpal = (DispCnt & 0x40000000);
@ -521,8 +527,7 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
for (int i = 0; i < 256; i++)
{
curtile = tilemap[((rotY & 0x1F800) >> 5) + ((rotY & wideymask) >> 6) +
((rotX & 0xF800) >> 11) + ((rotX & widexmask) >> 6)];
curtile = tilemap[((rotY & coordmask) >> 5) + ((rotX & coordmask) >> 11)];
curpal = pal;
if (extpal) curpal += ((curtile & 0xF000) >> 4);
pixels = tileset + ((curtile & 0x03FF) << 6);