29 April 2022, 11:22 | #81 |
Registered User
Join Date: Jul 2014
Location: Warsaw/Poland
Posts: 192
|
I would say bitplanes were chosen due to limited memory bandwidth vs a screen size at that time.
In case of bitplanes, to set 16 pixels we need write only one word. In case of 8bit chunky mode - eight words. Last edited by Cyprian; 29 April 2022 at 12:59. |
30 April 2022, 20:59 | #82 |
Registered User
Join Date: Nov 2018
Location: Germany
Posts: 42
|
Things I am missing from AGA, which realistically could have been done in 1990/91:
- 16 color, 8 sprite mode (32x32, 16x16), instead of ridiculously large 64x64 4 color sprites - Flexible DPF modes. 5 BP / 3 BP would have been REALLY useful. - Using the UHRES feature + VRAM to implement 4,8,16-bit packed pixel modes (aka „chunky“), which form an extra plane to be imposed over bitplane display - Copper move multiple with autoincrementing destination address to speed-up palette loads - Support blitting of interleaved planes with a single bit plane mask - Copper interrupt function & extra JMP / LINK register, wired to blitter end IRQ (…) |
30 April 2022, 21:07 | #83 | |
Registered User
Join Date: Nov 2018
Location: Germany
Posts: 42
|
Quote:
Bitplanes ARE what the Amiga stands for, and would have been extended even further for AAA. |
|
05 May 2022, 10:02 | #84 | |
Registered User
Join Date: Jul 2014
Location: Warsaw/Poland
Posts: 192
|
Quote:
actually VGA (EGA and CGA too) next to chunky has also bitplane modes, where each of them can be independently "moved" in its ram, also there is interesting mode where with one 'move' instruction you can write to all bitplanes at once. It can saves a lot of cpu cycles. |
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Indivision AGA all Display modes test and problems | doble07 | support.Hardware | 9 | 03 December 2009 08:56 |
Multisync CRT monitors that will display all Amiga modes? | mingle | support.Hardware | 7 | 21 December 2008 19:08 |
Problem with display modes (VGA) | Zombie13 | New to Emulation or Amiga scene | 4 | 01 July 2005 18:12 |
Custom display modes with RivaTuner | §ane | support.WinUAE | 6 | 02 October 2002 06:54 |
Custom Display Modes... | P-J | support.WinUAE | 3 | 15 July 2001 11:23 |
|
|