Mark the ATI extended 8514/A mode accordingly (that is, if bit 5 of ATI reg 0xb0 and using ATI extended ports at the same time). Fixes wrong colors in some instances using standard IBM 8514/A drivers on Mach32.
1. Added the missing call to mach32_updatemapping from port 0x3CF through its index 6.
2. If the accelerator DAC is active and the extended 256 color bit is on too then enable 8514/A mode when needed, otherwise it's VGA mode or decided by the passthrough/clock selection ports.
3. VGA DAC reads are redirected to the 8514/A DAC reads only when 8514/A mode is on.
1. vga_on global variable removed, as it didn't play well with 2 subsystems at once (8514/A and XGA both enabled).
2. Emulate the Foreground/Background Color aliases of PIX_TRANS properly when not executing a command.
3. Voodoo 3D override now works properly (again) with Mach32 PCI cards and others by turning the 8514/A timer off and on accordingly.
1. Simplified 4bpp rendering mode.
2. Implement CRTC31 bit 0 functionality which enables/disables the vendor banks. Fixes Diamond Stealth 64 964 VRAM (VLB/PCI) detection on NT 3.1 (and possibly other cards) while keeping NT 3.1 347.1's full screen Command Prompt test normal without garbage using the 911/924 chips.
IBM 8514/A (MCA/ISA).
Added a configure button to the QT frontend for the amount of memory used by said add-on chips.
XGA:
Forgot a change about the 4mb aperture.
1. Pattern/font fixes for Windows 3.1's third party XGA drivers as well as OS/2's win3.x' box (seamless and full).
2. The 4MB aperture is still used internally even if the 1MB one is in use, fixes OS/2's XGA driver on boot when less than 16MB of memory is used.
8514/A compatibles:
1. The mode switch (from VGA to 8514/A/ATI and vice-versa) has been fixed again (for the Nth time).
2. Removed a pattern hack used on DPCONFIG = 0x5211 on bitblt, now patterns work properly using the ATI Mach8 3.0 win3.1x drivers.
3. Clipping regs are more accurate for acceleration.
XGA 1-2:
A picky OS is a picky OS, fixes to the Win95 fonts (which uses the pattern sources) applied.
8514/A/Mach8/32:
Reworked the acceleration a bit as well as the mode switches from VGA to ATI/8514/A mode and viceversa based on the documentation. Fixes the Linux GUI fonts using the Mach32 driver (possibly Mach8 too) and other anomalies (still needs more work on the acceleration though).
PVGA:
Minor fixes to the banking.
S3-based (Pre-ViRGE):
1. Made the chip class use its own banking so that the Enhanced Mode mapping (equivalent to 64K-based A0000) is taken into account (per bit 3 of CRTC31, which forces the mapping to be 64K A0000, regardless of the GDCREG6 bits). Fixes NT 3.1 347.1's S3 driver.
2. Initial rework on 15bpp/16bpp accelerated mode of the 911/924 chips (currently not 100% bug free, I need help with this chips).
XGA-1/2:
Get rid of the linear endian reverse variable hack used by OS/2 and, instead, use the already declared ones more wisely, fixes OS/2 2.1 reversed fonts and keeps everything else working as it should.
Misc:
Added the BT481 RAMDAC for future card use.
