snickerbockers

use virtual file i/o API which defaults to a stdio wrapper

8

This PR implements a virtual file I/O layer that goes between libchdr and stdio. Users of libchdr can optionally implement their own file I/O functions instead of using the stdio...

it looks like gfxgl4 only does per-pixel. Perhaps this node should be obsolete, or perhaps gfxgl4 should support other order-independent transparency modes. Either way, the current status quo of having...

2k sports games that don't boot

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still trying to piece together what's going on, but the general gist is that these games are doing some erratic operations with the GD-ROM drive (such as sending DMA read...

ARM7's SWI exception handling is incorrect: https://github.com/washingtondc-emu/washingtondc/blob/f2ff42405d84dd81a7a8eda71941fd802d48ee6d/src/libwashdc/hw/arm7/arm7.c#L1997 If I recall correctly, there weren't actually any games that used this instruction so this issue is mostly pedantic. The below implementation is...

This is incorrect: https://github.com/washingtondc-emu/washingtondc/blob/f2ff42405d84dd81a7a8eda71941fd802d48ee6d/src/common/intmath.h#L86 I have discovered that in certain cases it does not return the correct value in *overflow_out. The root-cause appears to be that it's not correctly taking...

GD-ROM GDAPRO register (Gauntlet Legends)

1

Gauntlet Legends wants to do a DMA transaction to AICA memory, but it configured the GDAPRO register to only allow DMA to system memory. Stupid Midway! Ignoring the failed DMA...

This happens during E-102 gamma's story during the boss fight aganst beta: 1470890270 SH4 CPU cycles executed Average Performance is 199.896625 MHz (99.948312%) ERROR: unable to continue due to unimplemented...

tracking issue for games with depth precision bugs

5

commit 29b5b9dca14f468859bfbf00b30d1f985c56d9ce eliminated the perspective divide and fixed most of WashingtonDC's problems with depth precision but there are still a few problematic cases. Ironically, some of these cases were actually...

adding the maple dma irq latency broke Namco Museum Pole Position

2

3f8f5ecd78bda1eedf1279936514fbecbc3338a7 is the first bad commit commit 3f8f5ecd78bda1eedf1279936514fbecbc3338a7 Author: snickerbockers Date: Thu Oct 24 23:14:25 2019 -0700 add a delay to the maple DMA interrupts Star Wars Episode I Racer...

Crazy Taxi: minor discrepancy in attract mode behavior

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During attract mode, after B.D. Joe drives through the cafe, he's supposed to glance off the side of a U-haul truck and keep driving forward. In WashingtonDC the truck isn't...