nethack-gwaa-kiwi/nethack
1
0
Fork 0
Code Pull Requests Activity

MS-DOS: Define a separate palette for VGA text

Browse Source 
In 16 color mode, text colors are mapped onto the colors available in
the tileset. The mapping is a compromise, and is not one-to-one: cyan
and bright cyan are the same, and magenta and bright magenta are the
same.

This change defines a separate palette for use by the text map, and
switches palettes on any transition between text and tiled maps.
This commit is contained in:
Ray Chason
2026-07-07 16:24:35 -04:00
parent 749646e8d3
commit f3f39311e5
1 changed files with 46 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sys/msdos/vidvga.c
+45 -24
View File
@@ -182,31 +182,36 @@ extern int total_tiles_used, Tile_corr, Tile_unexplored; /* from tile.c */
} }
#define TOP_MAP_ROW 1 #define TOP_MAP_ROW 1
static int vgacmap[CLR_MAX] = { 1, 4, 6, 10, 5, 9, 0, 15, static const int vgacmap[CLR_MAX] = {
1, 4, 6, 10, 5, 9, 0, 15,
12, 3, 7, 8, 2, 9, 0, 14 }; 12, 3, 7, 8, 2, 9, 0, 14 };
static const int textcmap[CLR_MAX] = {
1, 4, 6, 10, 5, 9, 0, 15,
12, 3, 7, 8, 2, 11, 13, 14 };
static int viewport_size = 40; static int viewport_size = 40;
/* static char masktable[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01}; */ /* static char masktable[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01}; */
/* static char bittable[8]= {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; */ /* static char bittable[8]= {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; */
#if 0 /* When showing the text view, use this palette */
static char defpalette[] = { /* Default VGA palette */ static const struct Pixel text_palette[] = {
0x00, 0x00, 0x00, /* Permuted to mostly match the tileset */
0x00, 0x00, 0xaa, { 0x00, 0xaa, 0xaa, 0xff }, /* CLR_CYAN */
0x00, 0xaa, 0x00, { 0x00, 0x00, 0x00, 0xff }, /* CLR_BLACK */
0x00, 0xaa, 0xaa, { 0x44, 0x44, 0xff, 0xff }, /* CLR_BRIGHT_BLUE */
0xaa, 0x00, 0x00, { 0xff, 0x90, 0x00, 0xff }, /* CLR_ORANGE */
0xaa, 0x00, 0xaa, { 0xaa, 0x00, 0x00, 0xff }, /* CLR_RED */
0xaa, 0xaa, 0x00, { 0x22, 0x22, 0xff, 0xff }, /* CLR_BLUE */
0xaa, 0xaa, 0xaa, { 0x00, 0xaa, 0x00, 0xff }, /* CLR_GREEN */
0x55, 0x55, 0x55, { 0x00, 0xff, 0x00, 0xff }, /* CLR_BRIGHT_GREEN */
0xcc, 0xcc, 0xcc, { 0xff, 0xff, 0x00, 0xff }, /* CLR_YELLOW */
0x00, 0x00, 0xff, { 0xaa, 0x00, 0xaa, 0xff }, /* CLR_MAGENTA */
0x00, 0xff, 0x00, { 0x99, 0x40, 0x00, 0xff }, /* CLR_BROWN */
0xff, 0x00, 0x00, { 0xff, 0x00, 0xff, 0xff }, /* CLR_BRIGHT_MAGENTA */
0xff, 0xff, 0x00, { 0x55, 0x55, 0x55, 0xff }, /* NO_COLOR */
0xff, 0x00, 0xff, { 0x00, 0xff, 0xff, 0xff }, /* CLR_BRIGHT_CYAN */
0xff, 0xff, 0xff { 0xff, 0xff, 0xff, 0xff }, /* CLR_WHITE */
{ 0xaa, 0xaa, 0xaa, 0xff }, /* CLR_GRAY */
{ 0x00, 0xff, 0xff, 0xff } /* CLR_BRIGHT_CYAN repeated */
}; };
#endif
#ifndef ALTERNATE_VIDEO_METHOD #ifndef ALTERNATE_VIDEO_METHOD
int vp[SCREENPLANES] = { 8, 4, 2, 1 }; int vp[SCREENPLANES] = { 8, 4, 2, 1 };
@@ -552,6 +557,7 @@ void
vga_overview(boolean on) vga_overview(boolean on)
{ {
/* vga_HideCursor(); */ /* vga_HideCursor(); */
vga_SetPalette(paletteptr);
if (on) { if (on) {
iflags.over_view = TRUE; iflags.over_view = TRUE;
clipx = 0; clipx = 0;
@@ -572,10 +578,12 @@ vga_traditional(boolean on)
if (on) { if (on) {
/* switch_symbols(FALSE); */ /* switch_symbols(FALSE); */
iflags.traditional_view = TRUE; iflags.traditional_view = TRUE;
vga_SetPalette(text_palette);
clipx = 0; clipx = 0;
clipxmax = CO - 1; clipxmax = CO - 1;
} else { } else {
iflags.traditional_view = FALSE; iflags.traditional_view = FALSE;
vga_SetPalette(paletteptr);
if (!iflags.over_view) { if (!iflags.over_view) {
clipx = max(0, (curcol - viewport_size / 2)); clipx = max(0, (curcol - viewport_size / 2));
if (clipx > ((CO - 1) - viewport_size)) if (clipx > ((CO - 1) - viewport_size))
@@ -834,7 +842,7 @@ vga_Init(void)
iflags.tile_view = TRUE; iflags.tile_view = TRUE;
iflags.over_view = FALSE; iflags.over_view = FALSE;
#else #else
paletteptr = defpalette; paletteptr = text_palette;
#endif #endif
vga_SetPalette(paletteptr); vga_SetPalette(paletteptr);
g_attribute = attrib_gr_normal; g_attribute = attrib_gr_normal;
@@ -1008,7 +1016,7 @@ vga_WriteChar(uint32 chr, int col, int row, int colour)
char __far *cp; char __far *cp;
unsigned char fnt; unsigned char fnt;
int actual_colour = vgacmap[colour]; int actual_colour = colour;
int bgcolor; int bgcolor;
int vplane; int vplane;
unsigned char bitmap[ROWS_PER_CELL]; unsigned char bitmap[ROWS_PER_CELL];
@@ -1017,9 +1025,9 @@ vga_WriteChar(uint32 chr, int col, int row, int colour)
vga_GetBitmap(chr, bitmap); vga_GetBitmap(chr, bitmap);
if (curframecolor != NO_COLOR) if (curframecolor != NO_COLOR)
bgcolor = vgacmap[curframecolor]; bgcolor = curframecolor;
else else
bgcolor = BACKGROUND_VGA_COLOR; bgcolor = CLR_BLACK;
if (inversed) { if (inversed) {
int tmpc = actual_colour; int tmpc = actual_colour;
@@ -1027,6 +1035,19 @@ vga_WriteChar(uint32 chr, int col, int row, int colour)
bgcolor = tmpc; bgcolor = tmpc;
} }
#ifdef TILES_IN_GLYPHMAP
if (iflags.traditional_view) {
#endif
/* A one-to-one remapping to keep black at the same index either way */
actual_colour = textcmap[actual_colour];
bgcolor = textcmap[bgcolor];
#ifdef TILES_IN_GLYPHMAP
} else {
actual_colour = vgacmap[actual_colour];
bgcolor = vgacmap[bgcolor];
}
#endif
x = min(col, (CO - 1)); /* min() used protection from callers */ x = min(col, (CO - 1)); /* min() used protection from callers */
pixy = min(row, (LI - 1)) * 16; /* assumes 8 x 16 char set */ pixy = min(row, (LI - 1)) * 16; /* assumes 8 x 16 char set */
vplane = ~actual_colour & ~bgcolor & 0xF; vplane = ~actual_colour & ~bgcolor & 0xF;