Quote:
Originally Posted by pandy71
Technically all chips mentioned by you are or first or second generation of SVGA chip-sets (so they are not so old) where VGA legacy core existed almost in parallel to SVGA (and mostly undocumented).
Also there is no standard methods to access this functionality (even VESA standard was quite limited introducing VESA VBE and VESA AF quite late...).
VGA chips was usually quite limited in terms of flexibility so if we limit to VGA then all vendor unique functionality mentioned by you is not present.
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C='s Amiga AGA unit sales didn't even reach 1 million units.
"Screen dragging" functionality can be enabled for PC SVGA when hardware function is available and if it's a "killer app" then the PC market will gravitate towards it.
Examples of the PC market gravitating toward a particular vendor
1. NVIDIA's RT is a "killer app" that resulted in NVIDIA's discrete PC GPU dominance.
2. NVIDIA's GeForce's T&L (DirectX 6.1, DirectX7, Quake 3's NV15 map) feature was the "killer app" that killed 3DFX. NVIDIA directly wreaked 3DFX and SGI both in the market space and NV's counter-legal battles.
GeForce's hardware T&L was useful in pro-3D apps that stepped on SGI's core market.
3. NVIDIA's TNT/TNT2 32bit 3D render vs 3DFX's 16bit 3D render. The loser is 3DFX. ATI's graphics products are just commodity OEM shippers.
4. The gaming market was biased towards fake 3D around the late 1993 Doom era. X86 CPU cloners focused on good integer performance until 1996 Quake forced Pentium FPU issue on X86 CPU cloners.
Before NVIDIA TNT, my SVGA card is S3 Trio 64UV PCI.