diff options
| author | Arisotura <thetotalworm@gmail.com> | 2019-07-24 03:30:09 +0200 |
|---|---|---|
| committer | Arisotura <thetotalworm@gmail.com> | 2019-07-24 03:30:09 +0200 |
| commit | a8886d5949780221386ed623d12039bdc8e78e36 (patch) | |
| tree | 1d857ed186b4bf570593a82472f13168a23e1d8a /src/GPU2D.cpp | |
| parent | 3c006fd36154e48325c3cf862ed3287b265924c1 (diff) | |
GPU2D: add 'prohibited' large BG sizes
Diffstat (limited to 'src/GPU2D.cpp')
| -rw-r--r-- | src/GPU2D.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/GPU2D.cpp b/src/GPU2D.cpp index 4bba235..fbb7fea 100644 --- a/src/GPU2D.cpp +++ b/src/GPU2D.cpp @@ -2069,14 +2069,19 @@ void GPU2D::DrawBG_Large(u32 line) // BG is always BG2 u32 tilesetaddr, tilemapaddr; u16* pal; + // large BG sizes: + // 0: 512x1024 + // 1: 1024x512 + // 2: 512x256 + // 3: 512x512 u32 xmask, ymask; u32 yshift; switch (bgcnt & 0xC000) { case 0x0000: xmask = 0x1FFFF; ymask = 0x3FFFF; yshift = 9; break; case 0x4000: xmask = 0x3FFFF; ymask = 0x1FFFF; yshift = 10; break; - case 0x8000: // TODO (most likely the second size bit is just ignored) - case 0xC000: printf("bad BG size for large BG: %04X\n", bgcnt); return; + case 0x8000: xmask = 0x1FFFF; ymask = 0x0FFFF; yshift = 9; break; + case 0xC000: xmask = 0x1FFFF; ymask = 0x1FFFF; yshift = 9; break; } u32 ofxmask, ofymask; |