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Matrox FIFO status fix.

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OBattler
2024-04-25 10:55:07 +02:00
parent d740a8c164
commit 0aa695c070
1 changed files with 7 additions and 3 deletions
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10
src/video/vid_mga.c
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@@ -1562,14 +1562,14 @@ mystique_ctrl_read_b(uint32_t addr, void *priv)
switch (addr & 0x3fff) {
case REG_FIFOSTATUS:
fifocount = FIFO_SIZE - FIFO_ENTRIES;
if (fifocount > 64)
fifocount = 64;
if (fifocount > (mystique->type <= MGA_1064SG ? 32 : 64))
fifocount = (mystique->type <= MGA_1064SG ? 32 : 64);
ret = fifocount;
break;
case REG_FIFOSTATUS + 1:
if (FIFO_EMPTY)
ret |= 2;
else if (FIFO_ENTRIES >= 64)
else if (FIFO_ENTRIES >= (mystique->type <= MGA_1064SG ? 32 : 64))
ret |= 1;
break;
case REG_FIFOSTATUS + 2:
@@ -1583,6 +1583,10 @@ mystique_ctrl_read_b(uint32_t addr, void *priv)
ret |= REG_STATUS_VSYNCSTS;
if (ret & 1)
mystique->softrap_status_read = 1;
if (mystique->softrap_status_read == 0 && !(ret & 1)) {
mystique->softrap_status_read = 1;
ret |= 1;
}
break;
case REG_STATUS + 1:
ret = (mystique->status >> 8) & 0xff;