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Refactor ASCII rasterizer to support terminal ANSI mode and improve menu text rendering

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Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>
This commit is contained in:
Hans Kokx
2026-03-18 16:06:20 +01:00
parent 839fae700f
commit be03bd45c8
8 changed files with 204 additions and 88 deletions
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49
packages/wolf_3d_dart/lib/wolf_3d_menu.dart
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@@ -43,6 +43,55 @@ abstract class WolfMenuPic {
];
}
/// Shared menu text colors resolved from the VGA palette.
///
/// Keep menu color choices centralized so renderers don't duplicate
/// hard-coded palette slots or RGB conversion logic.
abstract class WolfMenuPalette {
static const int selectedTextIndex = 19;
static const int unselectedTextIndex = 23;
static const int _headerTargetRgb = 0xFFF700;
static int? _cachedHeaderTextIndex;
static int get headerTextIndex =>
_cachedHeaderTextIndex ??= _nearestPaletteIndex(_headerTargetRgb);
static int get selectedTextColor => ColorPalette.vga32Bit[selectedTextIndex];
static int get unselectedTextColor =>
ColorPalette.vga32Bit[unselectedTextIndex];
static int get headerTextColor => ColorPalette.vga32Bit[headerTextIndex];
static int _nearestPaletteIndex(int rgb) {
final int targetR = (rgb >> 16) & 0xFF;
final int targetG = (rgb >> 8) & 0xFF;
final int targetB = rgb & 0xFF;
int bestIndex = 0;
int bestDistance = 1 << 30;
for (int i = 0; i < 256; i++) {
final int color = ColorPalette.vga32Bit[i];
final int r = color & 0xFF;
final int g = (color >> 8) & 0xFF;
final int b = (color >> 16) & 0xFF;
final int dr = targetR - r;
final int dg = targetG - g;
final int db = targetB - b;
final int distance = (dr * dr) + (dg * dg) + (db * db);
if (distance < bestDistance) {
bestDistance = distance;
bestIndex = i;
}
}
return bestIndex;
}
}
/// Structured accessors for classic Wolf3D menu art.
class WolfClassicMenuArt {
final WolfensteinData data;