Advanced Drawing Techniques - nesbox/TIC-80 GitHub Wiki

0x03FF0 Palette Map / Swapping colors

Usage

poke4(2*0x03FF0 + color_index, mapped_color_index)

Description

+-------+-------------------+-------+
| ADDR  | INFO              | SIZE  |
|-------+-------------------+-------|
| 00000 | SCREEN            | 16320 | 240x136 = 32640 4bit pixels
| 03FC0 | PALETTE           | 48    | 16 x 24bit RGB color values
| 03FF0 | PALETTE MAP       | 8     | 16 x 4bit color indexes (for palette swapping of individual sprites)
+-------+-------------------+-------+

TIC-80 uses PALETTE MAP to swap 4 bits colors indices to be drawn to any combination of 4 bits colors in the palette. The mapped 4 bits color is written on SCREEN.

With sprite-drawing functions (spr, map, ttri), this color swap is done when reading the color from sprite memory.

colorkey parameters are applied on source colors, swapping out color indices before remapping.

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0x03FFC Blit Segment / Low BPP graphics ([BETA FEATURE, spec might change before release]0.80)

Please see Blit Segment.