diff options
Diffstat (limited to 'src/vga.c')
| -rw-r--r-- | src/vga.c | 53 |
1 files changed, 46 insertions, 7 deletions
@@ -1,7 +1,10 @@ #include "vga.h" +#include <stdbool.h> + #include "string.h" +static bool params_ok( vga_t *vga, const int x, const int y ); static int calculate_offset( vga_t *vga ); static uint8_t calculate_color_cell( vga_t *vga ); @@ -32,6 +35,9 @@ void vga_clear_screen( vga_t *vga ) void vga_set_cursor( vga_t *vga, const int x, const int y ) { + // TODO: PANIC? OUT OF BOUND ACCESS + if( !params_ok( vga, x, y ) ) return; + vga->cursor_x = x; vga->cursor_y = y; } @@ -62,16 +68,49 @@ static uint8_t calculate_color_cell( vga_t *vga ) return cell; } -void vga_put_char( vga_t *vga, const int x, const int y, const uint8_t c ) +static bool params_ok( vga_t *vga, const int x, const int y ) +{ + if( x > vga->res_x || y > vga->res_y ) return false; + + return true; +} + +void vga_put_char_at( vga_t *vga, const int x, const int y, const char c ) { - // TODO: PANIC? OUT OF BOUND ACCESS - if( x > vga->res_x || y > vga->res_y ) return; - vga_set_cursor( vga, x, y ); - + vga_put_char( vga, c ); +} + + +void vga_put_string_at( vga_t *vga, const int x, const int y, const char *s ) +{ + vga_set_cursor( vga, x, y ); + vga_put_string( vga, s ); +} + +void vga_put_char( vga_t *vga, const char c ) +{ int offset = calculate_offset( vga ); volatile uint8_t *VIDEO_MEMORY = (uint8_t *)0xb8000; - *(VIDEO_MEMORY+offset) = c; - *(VIDEO_MEMORY+offset+1) = calculate_color_cell( vga ); + *(VIDEO_MEMORY+offset) = (uint8_t)c; + *(VIDEO_MEMORY+offset+1) = calculate_color_cell( vga ); + + vga->cursor_x++; + if( vga->cursor_x >= vga->res_x ) { + vga->cursor_x = 0; + vga->cursor_y++; + if( vga->cursor_y >= vga->res_y ) { + // TODO: implement scrolling + vga->res_y = 0; + } + } +} + +void vga_put_string( vga_t *vga, const char *s ) +{ + for( size_t i = 0; i < strlen( s ); i++ ) { + vga_put_char( vga, s[i] ); + } } + |