From bce944d1498eaa3b6940ee234c863b3548a66b37 Mon Sep 17 00:00:00 2001 From: Benji Dial Date: Sun, 24 Jan 2021 12:00:11 -0500 Subject: graphics! --- src/kernel/vga.c | 52 ---------------------------------------------------- 1 file changed, 52 deletions(-) delete mode 100644 src/kernel/vga.c (limited to 'src/kernel/vga.c') diff --git a/src/kernel/vga.c b/src/kernel/vga.c deleted file mode 100644 index 6ae1588..0000000 --- a/src/kernel/vga.c +++ /dev/null @@ -1,52 +0,0 @@ -#include -#include - -#define VGA_COLUMNS 80 -#define VGA_ROWS 25 -#define VGA_START (uint16_t *)0x000b8000 -#define VGA_END (VGA_START + VGA_COLUMNS * VGA_ROWS) -static uint16_t *cursor = VGA_START; -static uint16_t mask; - -void vga_set_color(uint8_t new_color) { - mask = new_color << 8; -} - -void vga_swap_color(uint16_t pos) { - uint8_t *color_byte = (uint8_t *)(VGA_START + (pos >> 8) * VGA_COLUMNS + (pos & 0xff)) + 1; - *color_byte = (*color_byte << 4) + (*color_byte >> 4); -} - -static void vga_scroll() { - for (uint32_t *i = (uint32_t *)VGA_START; i < (uint32_t *)(VGA_END - VGA_COLUMNS); ++i) - *i = *(i + VGA_COLUMNS / 2); - uint32_t f = (mask | (uint8_t)' ') * 0x00010001; - for (uint32_t *i = (uint32_t *)(VGA_END - VGA_COLUMNS); i < (uint32_t *)VGA_END; ++i) - *i = f; - cursor -= VGA_COLUMNS; -} - -void vga_blank() { - uint32_t f = (mask | (uint8_t)' ') * 0x00010001; - uint32_t *p = (uint32_t *)VGA_START; - while (p < (uint32_t *)VGA_END) - *p++ = f; - cursor = VGA_END - VGA_COLUMNS; -} - -void vga_printch(char ch) { - if (ch == '\n') - cursor = ((cursor - VGA_START) / VGA_COLUMNS + 1) * VGA_COLUMNS + VGA_START; - else if (ch == '\b') - *--cursor = mask | ' '; - else - *cursor++ = mask | (uint8_t)ch; - if (cursor == VGA_END) - vga_scroll(); -} - -void vga_print_at(uint16_t pos, const char *sz) { - cursor = VGA_START + (pos >> 8) * VGA_COLUMNS + (pos & 0xff); - while (*sz) - vga_printch(*sz++); -} \ No newline at end of file -- cgit v1.2.3