diff options
-rw-r--r-- | vgasrc/stdvga.c | 23 | ||||
-rw-r--r-- | vgasrc/stdvga.h | 4 | ||||
-rw-r--r-- | vgasrc/vgabios.c | 4 |
3 files changed, 18 insertions, 13 deletions
diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c index da67af41..eac0357b 100644 --- a/vgasrc/stdvga.c +++ b/vgasrc/stdvga.c @@ -18,19 +18,32 @@ * Attribute control ****************************************************************/ +// Emulate CGA background setting via VGA palette index registers void -stdvga_set_border_color(u8 color) +stdvga_set_cga_background_color(u8 color) { + // Set the background color (via palette index 0) u8 v1 = color & 0x0f; if (v1 & 0x08) v1 += 0x08; stdvga_attr_write(0x00, v1); + // Dim/brighten foreground (see pal_cga[] in stdvgamodes.c) int i; for (i = 1; i < 4; i++) stdvga_attr_mask(i, 0x10, color & 0x10); } +// Emulate CGA palette setting by altering VGA palette index registers +void +stdvga_set_cga_palette(u8 palid) +{ + // Switch foreground colors (see pal_cga[] in stdvgamodes.c) + int i; + for (i = 1; i < 4; i++) + stdvga_attr_mask(i, 0x01, palid & 0x01); +} + void stdvga_set_overscan_border_color(u8 color) { @@ -44,14 +57,6 @@ stdvga_get_overscan_border_color(void) } void -stdvga_set_palette(u8 palid) -{ - int i; - for (i = 1; i < 4; i++) - stdvga_attr_mask(i, 0x01, palid & 0x01); -} - -void stdvga_set_all_palette_reg(u16 seg, u8 *data_far) { int i; diff --git a/vgasrc/stdvga.h b/vgasrc/stdvga.h index ce797836..a2375c7e 100644 --- a/vgasrc/stdvga.h +++ b/vgasrc/stdvga.h @@ -45,10 +45,10 @@ #define SEG_MTEXT 0xB000 // stdvga.c -void stdvga_set_border_color(u8 color); +void stdvga_set_cga_background_color(u8 color); +void stdvga_set_cga_palette(u8 palid); void stdvga_set_overscan_border_color(u8 color); u8 stdvga_get_overscan_border_color(void); -void stdvga_set_palette(u8 palid); void stdvga_set_all_palette_reg(u16 seg, u8 *data_far); void stdvga_get_all_palette_reg(u16 seg, u8 *data_far); void stdvga_toggle_intensity(u8 flag); diff --git a/vgasrc/vgabios.c b/vgasrc/vgabios.c index 2ca8c3dd..d522f835 100644 --- a/vgasrc/vgabios.c +++ b/vgasrc/vgabios.c @@ -457,13 +457,13 @@ handle_100a(struct bregs *regs) static void handle_100b00(struct bregs *regs) { - stdvga_set_border_color(regs->bl); + stdvga_set_cga_background_color(regs->bl); } static void handle_100b01(struct bregs *regs) { - stdvga_set_palette(regs->bl); + stdvga_set_cga_palette(regs->bl); } static void |