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Merge pull request #3944 from Cacodemon345/mga-busmastering-fixes

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MGA: Make sure dxdiag on D3D 9.0b doesn't crash the emulator
This commit is contained in:
Miran Grča
2023-12-27 10:42:28 +01:00
committed by GitHub
parent acdc2c7aee c597a44c87
commit cee111746b
1 changed files with 10 additions and 0 deletions
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10
src/video/vid_mga.c
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@@ -2511,6 +2511,16 @@ mystique_ctrl_write_l(uint32_t addr, uint32_t val, void *priv)
//mystique->dma.pri_state = 0;
wake_fifo_thread(mystique);
}
/* HACK: For DirectX 9.0b Direct3D testing on Windows 98 SE.
The 4.12.013 drivers give an out-of-bounds busmastering range when dxdiag enumerates Direct3D, with exactly 16384 bytes of difference.
Don't attempt busmastering in such cases. This isn't ideal, but there are no more crashes faced in this case. */
if ((mystique->dma.primend & DMA_ADDR_MASK) < (mystique->dma.primaddress & DMA_ADDR_MASK) && ((mystique->dma.primaddress & DMA_ADDR_MASK) - (mystique->dma.primend & DMA_ADDR_MASK)) == 0x4000)
{
mystique->dma.primaddress = mystique->dma.primend;
mystique->endprdmasts_pending = 1;
mystique->dma.state = DMA_STATE_IDLE;
}
thread_release_mutex(mystique->dma.lock);
break;