Setting Specific Background/Playfield Line Colors?

[Cybearg]

In my case I'm using the DPC+ kernel.

 

Is there a way to set the background or playfield color for a certain line without changing all the other line colors?

[+Atarius Maximus]

RevEng or iesposta may have a better answer, but from what I've seen there is no command to do that. It's inefficient, but if you wanted to change a single line you could call bkcolors in a subroutine. Press fire in this demo to have one line of background color change from black to orange.

 

if joy0fire then gosub change else gosub normal
change
bkcolors:
$00
$00
$00
$00
$00
$00
$28
$00
$00
$00
$00
$00
$00
$00
$00
$00
end
return
normal
bkcolors:
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
$00
end
return

move_test.txt

move_test.bin

[Cybearg]

I hope there's a better way, because in my case, I have a playfield that's 32 units high and there are 36 possible color combinations for the playfield.

 

Which means at least 1152 bytes wasted in redundant statements, not to mention the cycles and bytes lost to the branching logic on ... goto statements.

 

I don't see why it's impossible, since the color is just a value loaded into the memory. Why can't those values be directly modified/accessed?

Edited March 10, 2013 by Cybearg

[+Atarius Maximus]

I hope there's a better way, because in my case, I have a playfield that's 32 units high and there are 36 possible color combinations for the playfield.

 

Which means at least 1152 bytes wasted in redundant statements, not to mention the cycles and bytes lost to the branching logic on ... goto statements.

 

I don't see why it's impossible, since the color is just a value loaded into the memory. Why can't those values be directly modified/accessed?

Hopefully there is a better way, I just don't know what it is. I agree that in your case that wouldn't be a good way to do it.