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GPU2D: add 'prohibited' large BG sizes

This commit is contained in:
Arisotura 2019-07-24 03:30:09 +02:00
parent 3c006fd361
commit a8886d5949
1 changed files with 7 additions and 2 deletions
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9
src/GPU2D.cpp
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@ -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;