diff options
| -rw-r--r-- | GPU2D.cpp | 15 |
1 files changed, 10 insertions, 5 deletions
@@ -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); |