PTDQ - faster C2P

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saimo

PTDQ - faster C2P

Posted on: 2/10 12:06 #1

Quite a regular

Just released.

PTDQ is a video system for AGA Amigas that provides a chunky-to-planar method which is faster than the traditional ones. It is the higher-quality brother of PTDS (formerly PED81C), another system based on the same core principle.


SIMPLIFIED COMPARISON CHART

----------------+------------+----------------+--------------+---------+------

                | horizontal | maximum number | color choice | visual  |

         system | resolution |      of colors | freedom      | quality | speed

----------------+------------+----------------+--------------+---------+------

           PTDQ | full       |            256 | **           | **      | **

           PTDS | half       |             81 | *            | *       | ***

traditional C2P | full       |            256 | ***          | ***     | *



          C2P PERFORMANCE COMPARISON SUMMARY

---------+---------+------------------+---------------

         |         | C2P conversions  | C2P conversion

 machine | routine | per second       | time (frames)

 --------+---------+------------------+---------------

 A1200   | PTDQ    | 12.670  (+2.493) | 3.946 (-0.966)

         | K030    | 10.177           | 4.912

 --------+---------+------------------+---------------

 A1200B  | PTDQ    | 50.098 (+13.425) | 0.998 (-0.365)

         | K030    | 36.673           | 1.363

 --------+---------+------------------+---------------

 A1200PS | PTDQ    | 86.340 (+12.494) | 0.579 (-0.098)

         | K040    | 73.846           | 0.677

 --------+---------+------------------+---------------

 A1200TF | PTDQ    | 67.689  (+4.699) | 0.738 (-0.055)

         | K040    | 62.990           | 0.793

 --------+---------+------------------+---------------

 A4000CS | PTDQ    | 72.690  (+7.614) | 0.687 (-0.081)

         | K040    | 65.076           | 0.768



A1200:   Amiga 1200

A1200B:  Amiga 1200, Blizzard 1230 IV, 68030 @ 50 MHz, 60 ns RAM

A1200PS: Amiga 1200, PiStorm32-lite, Raspberry Pi CM4, firmware v1.04

A1200TF: Amiga 1200, TerribleFire TF1260, 68060 @ 50 MHz, firmware 68090

A4000CS: Amiga 4000, NTSC PAL-jumpered, CyberStorm MK III, 68060 @ 50 MHz



PTDQ = PTDQ_DoC2P()

K030/K040 = Kalms c2p1x1_8_c5_030_2() / c2p1x1_8_c5_040()

Video: https://www.youtube.com/watch?v=witR2EE9No8

[The video quality of the real machine output is heavily affected by the fact that the scandoubler did not support SHRES (so a real-time software trick was used to somehow produce the colors, although it is only a visual illusion and causes a sort of rasterline effect), the monitor did not support progressive PAL and the video was captured with an ancient phone at just 24.917 Hz. YouTube's compression degraded the video quality.]

Full details are provided in documentation included in the archive that can be downloaded from https://retream.itch.io/ptdq.

RETREAM - retro dreams for Amiga, Commodore 64 and PC

NinjaCyborg

Re: PTDQ - faster C2P

Posted on: 2/10 13:21 #2

Not too shy to talk

hypothetically could this be used in an operating system app, especially, a web browser that has an off screen buffer where the html/css has been rendered into a chunky bitmap, and then the actual browser needs to blit sections of that into the real screen buffer to show the rendering in a window

saimo

Re: PTDQ - faster C2P

Posted on: 2/10 17:45 #3

Quite a regular

@NinjaCyborg

Technically yes, but the LORES resolution and the lack of clarity wouldn't be suitable for web pages.

RETREAM - retro dreams for Amiga, Commodore 64 and PC

NinjaCyborg

Re: PTDQ - faster C2P

Posted on: 2/10 20:07 #4

Not too shy to talk

it doesn't work at hires 256 colours on AGA?

saimo

Re: PTDQ - faster C2P

Posted on: 2/10 20:38 #5

Quite a regular

@NinjaCyborg

No, because it uses SHRES to simulate LORES dots.

RETREAM - retro dreams for Amiga, Commodore 64 and PC

manga303

Re: PTDQ - faster C2P

Posted on: 2/12 21:47 #6

Just popping in

It looks really great and fast :) but what games profit from it ? and how it works ? can i just load this, install it and start like Wolf3D to get more fps ?

im just not so much into this :)

saimo

Re: PTDQ - faster C2P

Posted on: 2/12 23:33 #7

Quite a regular

@manga303

It's for developers, so only future games/demos will benefit from it - if any will use it at all, that is.

RETREAM - retro dreams for Amiga, Commodore 64 and PC

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