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ATI Mach32 slow graphics and some glitches #6927

Description

@lazerode

Checklist

  • I have searched the issue tracker and was unable to find an open or closed issue matching what I'm seeing.
  • I have verified that the issue is happening in the latest nightly build, or the latest commit, if building from source.

What happened?

Graphics rendering with the ATI Mach32 is unusually slow, and each line is rendered slowly.

Plus, I can see one form of graphical glitch.

Image

Configuration file

[ATI Mach32 (PCI)]
ramdac = 0
memory = 4096

[PS/2 Mouse]
buttons = 4

[Sound Blaster 16 #1]
base = 0220
base401 = 0330
irq = 7
dma = 1
dma16 = 5
gameport = 0
opl = 1
control_pc_speaker = 0
receive_input = 1
receive_input401 = 1

[Novell NE2000 #1]
base = 0300
irq = 5
mac = da:80:cb
bios_addr = 00000

[General]
emu_build_num = 8592
force_43 = 1
host_cpu = Intel(R) Core(TM) i5-1035G1 CPU @ 1.00GHz
uuid = <removed>
vid_renderer = qt_software
vid_resize = 2
window_fixed_res = 1024x768
window_remember = 1

[Machine]
cpu_family = pentium_p5
cpu_multi = 1
cpu_speed = 66666666
cpu_use_dynarec = 1
fpu_type = internal
machine = revenge
mem_size = 65536

[Video]
gfxcard = mach32_pci

[Input devices]
keyboard_type = keyboard_ps2
mouse_type = ps2

[Sound]
midi_device = system_midi
sndcard = sb16

[Network]
net_01_card = novell_ne2k
net_01_host_device = <removed>
net_01_link = 0
net_01_net_type = pcap
net_02_card = modem
net_02_link = 0
net_02_net_type = slirp
net_03_link = 0
net_04_link = 0

[Ports (COM & LPT)]
lpt1_device = postscript

[Storage controllers]
scsicard_1 = aha154xcf

[Hard disks]
hdd_01_fn = 1.vhd
hdd_01_parameters = 63, 16, 4161, 0, scsi
hdd_01_scsi_location = 0:00
hdd_01_speed = ramdisk
hdd_01_vhd_blocksize = 4096

[Floppy and CD-ROM drives]
cdrom_01_image_path = 
cdrom_01_parameters = 1, scsi
cdrom_01_scsi_location = 0:02
cdrom_01_speed = 4
fdd_01_check_bpb = 0
fdd_01_turbo = 1
fdd_01_type = 35_2ed
fdd_02_check_bpb = 0
fdd_02_type = 525_2hd

[Other removable devices]
tape_01_parameters = 0, scsi
tape_01_scsi_location = 0:03

[Adaptec AHA-154xCF #1]
base = 0334
irq = 11
dma = 6
bios_addr = C8000
fdc_addr = 0000

Operating system

Windows 11 Canary (build 27952)

86Box version

v6.0 build 8592

Build architecture

Windows - x64 (64-bit)

Build type

  • New recompiler
  • Debug build

Additional context

I am not able to upload a screen recording showing the glitch but once you reproduce the issue, you will see what I mean.

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