Cleaned up the code and fixed the reset and LFB accesses. NT 4.0 now works with its v2.47 drivers without a soft reset (it used to only with a soft reset originally and, without it, hang with a blank screen upon reaching the GUI).
IBM 8514/A set:
Fixed a one off video bug that was causing the VGA video to not be restored after quitting a 8514/A GUI session (namely on Win2.x' 8514/A's driver).
ATI Mach32:
Fixed another vertical display issue when activated (in 1280x1024 mode, when 1024 was 1022).
All involved:
Apply RG's changedvram fix to 8514/A, Mach8/32 and XGA's changedvram pointers.
1. Ported the S3 ViRGE reset fix to the Pre-ViRGE cards.
2. Slight cleanup on the acceleration and logs.
3. Unused sequencer register data now return 0xff instead of 0. This fixes Scorched Earth 1.x on DOS using S3 Trio32/64/V+/V2/868/968 cards (on other S3 it works fine as is).
1. Added an on-board S3 ViRGE DX (375) video card to the Intel AP440FX socket 8-based machine alongside its on-board CS4236B audio.
2. Sanity check for on-board S3 ViRGE devices.
1. Added the Diamond Stealth 64 Video VRAM 968-based card.
2. Removed the useless VLB-based Phoenix 868 and 968 cards.
3. The Diamond Stealth 64 Video VRAM specific drivers apparently use 0x83ca-0x83cb as aliases of the RAMDAC ports 0x83c6-0x83c7 (New MMIO mode). This makes the hardware cursor visible in those drivers on win3.1 using the IBM RGB RAMDAC.
4. A few more logs and sanity checks around LFB access and MMIO as well.
1. Corrected the ATI 1881x clocks for use with the ATI Mach8/32 and VGA Wonder chips. The CPU slowdowns should now be gone.
2. Merged I/O ports common to both the ATI and IBM 8514/A compatible chips where they have identical code (extended behavior is still separate). Code duplication is now less than before.
3. Fixed a general polygon pattern issue in the Mach8/32 affecting calc.exe in Win3.x and other stuff.
4. Mode changes are, once again, changed (ATI and IBM), as close as possible to the real thing without destroying existing resolutions.
5. The 8514/A Vertical Counter has been extended to 0xfff so that it can take 1280x1024 resolutions well offered by the Mach32 as well as a better way to change the IBM/ATI modes through a callback swap where approprietate.
6. in 8514/A mode, reads from the 0x3c6-0x3c9 ramdac range is redirected to the 8514/A RAMDAC (0x2ea-0x2ed).
7. LFB access in the Mach32 now no longer takes account of the SVGA derived rops. Fixes Mach32 display on NeXTSTEP/OPENSTEP 3.x/4.x
8. Reworked the Display Sense Status and Subsystem Status ports so that they're not copycats from MAME and instead follow the datasheet.
These few cases where it gets corrupt fonts like in some builds of NT 4.0 and mode changes in Win95's driver.
Hopefully this keeps everything else intact.
S3 928:
When the pitch is 1280, make sure the proper horizontal resolution is displayed right (in this case, 1280x1024).
S3 Vision864:
Exclude it from the horizontal blank bits due to more issues that are TBD (like the Trio32 and 64 and up), this works around the mode issues under Windows 9x and more as well as fix 32bpp horizontal rendering in said chip.
1. On both Mach'es: direct linear video memory access is now the default for LFB mapping: fixes Mach64 drivers on NeXTSTEP/OPENSTEP and keeps everything else intact.
2. Mach8/32: minor cleanup to mode change code.
1. Text is no longer glitchy under win95 using XGA.
2. Now there's a better way to handle the cursor/sprite X/Y offsets, should fix remaining Win3.x cursor blackness and other stuff using said cursor.
