diff options
Diffstat (limited to 'vgasrc/stdvga.c')
| -rw-r--r-- | vgasrc/stdvga.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/vgasrc/stdvga.c b/vgasrc/stdvga.c index 63700d41..4e2fb1fd 100644 --- a/vgasrc/stdvga.c +++ b/vgasrc/stdvga.c @@ -91,31 +91,36 @@ stdvga_set_palette_blinking(u8 enable_blink) stdvga_attr_mask(0x10, 0x08, (enable_blink & 0x01) << 3); } +// Select 4-bit or 6-bit palette indexes (for "page" switching of colors) void -stdvga_select_video_dac_color_page(u8 flag, u8 data) +stdvga_set_palette_pagesize(u8 pal_pagesize) { - if (!(flag & 0x01)) { - // select paging mode - stdvga_attr_mask(0x10, 0x80, data << 7); - return; - } - // select page + stdvga_attr_mask(0x10, 0x80, pal_pagesize << 7); +} + +// Set palette index offset (enables color switching via "pages") +void +stdvga_set_palette_page(u8 pal_page) +{ + // Check if using 4-bit or 6-bit "palette index pages" u8 val = stdvga_attr_read(0x10); if (!(val & 0x80)) - data <<= 2; - data &= 0x0f; - stdvga_attr_write(0x14, data); + pal_page <<= 2; + // select page + pal_page &= 0x0f; + stdvga_attr_write(0x14, pal_page); } +// Report current palette index pagesize and current page void -stdvga_read_video_dac_state(u8 *pmode, u8 *curpage) +stdvga_get_palette_page(u8 *pal_pagesize, u8 *pal_page) { u8 val1 = stdvga_attr_read(0x10) >> 7; u8 val2 = stdvga_attr_read(0x14) & 0x0f; if (!(val1 & 0x01)) val2 >>= 2; - *pmode = val1; - *curpage = val2; + *pal_pagesize = val1; + *pal_page = val2; } |