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Search: Posts Made By: Niklas
Forum: Coders. General 15 October 2018, 12:32
Replies: 5
Views: 268
Posted By Niklas
Consider the vertex transformation pipeline as...

Consider the vertex transformation pipeline as seen in the first image on this page: http://www.songho.ca/opengl/gl_transform.html.

You can do back-face culling (BFC) either in eye coordinates, or...
Forum: support.Hardware 10 August 2018, 10:43
Replies: 13
Views: 478
Posted By Niklas
I have both of these,...

I have both of these, https://www.amazon.com/VCANDO-Converter-Adapter-Switch-Scaler/dp/B01N06Q9WH and https://www.amazon.com/Scart-Converter-Scaler-S-Video-Images/dp/B01DLZ8K0C (seems to be same...
Forum: support.Hardware 10 July 2018, 22:01
Replies: 84
Views: 8,638
Posted By Niklas
Congratulations! Well done.

Congratulations! Well done.
Forum: Hardware mods 30 June 2018, 02:44
Replies: 28
Views: 1,855
Posted By Niklas
Nice to see that you are making progress :) ...

Nice to see that you are making progress :)



To understand the Amiga video signal you should understand that it is made according to the NTSC video standard.

You have a PAL Amiga, but as the...
Forum: Coders. Blitz Basic 26 June 2018, 17:46
Replies: 136
Views: 5,389
Posted By Niklas
That's a pretty clever solution. Still (as you...

That's a pretty clever solution. Still (as you point out) on a 68000 CPU the branching solution is quite a bit faster:

move.l d0,d1 ; 4
add.l d1,d1 ; 8
subx.l d1,d1 ; 8
...
Forum: Hardware mods 24 June 2018, 23:43
Replies: 28
Views: 1,855
Posted By Niklas
CCK is not the pixel clock -- CCK is the chroma...

CCK is not the pixel clock -- CCK is the chroma clock (or color clock), which is 3.58 MHz on an NTSC Amiga, and slightly lower on a PAL Amiga.

The lores pixel clock is twice the CCK, that is 7.16...
Forum: Hardware mods 22 June 2018, 00:47
Replies: 28
Views: 1,855
Posted By Niklas
CCK is the chroma clock which is 3.58 MHz. The...

CCK is the chroma clock which is 3.58 MHz. The (hires) pixel clock is four times that (14.3 MHz).

The following page has a lot of good information:...
Forum: Hardware mods 22 June 2018, 00:06
Replies: 28
Views: 1,855
Posted By Niklas
This isn't quite an answer to your question, but...

This isn't quite an answer to your question, but perhaps you can extract hsync and vsync from csync (composite sync) which is available on pin 32 on Denise?
Forum: Coders. System 09 June 2018, 14:31
Replies: 14
Views: 2,038
Posted By Niklas
We haven't discussed a Zorro version, but it...

We haven't discussed a Zorro version, but it sounds like a reasonable thing to do. The changes needed for a Zorro version should be straight-forward, I think.



It's nice to hear that more than...
Forum: Coders. System 08 June 2018, 15:05
Replies: 14
Views: 2,038
Posted By Niklas
Me and a friend are doing an Amiga 500 trapdoor...

Me and a friend are doing an Amiga 500 trapdoor expansion card that has an FPGA, an SRAM, and a Raspberry Pi 3 on it. The memory in the SRAM is shared between the A500 and the Raspberry. The A500...
Forum: Coders. General 25 April 2018, 19:51
Replies: 21
Views: 2,015
Posted By Niklas
Hi, and thanks :) I'm not Scali.

Hi, and thanks :)

I'm not Scali.
Forum: Coders. General 25 April 2018, 14:50
Replies: 21
Views: 2,015
Posted By Niklas
Hi, I have the repository...

Hi, I have the repository https://github.com/niklasekstrom/blitter-subpixel-line that was mentioned above.

I just updated it with the document "Sub-pixel accurate rasterization of polygons using...
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