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vga, again

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slinky55
2026-07-15 23:02:24 -05:00
parent 0c6aaa1aed
commit 37aa46c847
4 changed files with 31 additions and 4 deletions
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18
kernel/drivers/vga/vga.c
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@@ -128,3 +128,21 @@ void vga_clear_scrn(uint32_t color) {
uint32_t vga_write(vfs_node_t* node, uint32_t offset, uint32_t size, uint8_t* buf) {
return size;
}
void test_draw_vertical_line(uint32_t x, uint32_t y_start, uint32_t y_end, uint32_t color) {
if (framebuffer_address == 0) return;
uint8_t* fb_bytes = (uint8_t*)framebuffer_address;
for (uint32_t y = y_start; y < y_end; y++) {
if (y >= framebuffer_height) break;
uint8_t* row = fb_bytes + (y * framebuffer_pitch);
uint32_t* pixel_row = (uint32_t*)row;
if (x < framebuffer_width) {
pixel_row[x] = color;
}
}
}

2
kernel/drivers/vga/vga.h
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@@ -42,4 +42,6 @@ void vga_clear_scrn(uint32_t color);
uint32_t vga_write(vfs_node_t* node, uint32_t offset, uint32_t size, uint8_t* buf);
void test_draw_vertical_line(uint32_t x, uint32_t y_start, uint32_t y_end, uint32_t color);
#endif

2
kernel/kmain.c
View File

@@ -141,7 +141,7 @@ void kmain(multiboot_info* mbi) {
#endif
}
console_putchar('c');
test_draw_vertical_line(100, 100, 150, 0xFFFFFFFF);
return;
kprintf("basic initializations complete\n");

13
kernel/lib/console.c
View File

@@ -14,12 +14,19 @@ static void write_vga_char(char c) {
uint32_t vga_pitch = vga_get_pitch();
uint8_t* glyph = (uint8_t*)font->glyphs + (c * font->hdr->charsz);
uint32_t pixel_y_start = console_row * font->hdr->charsz;
uint32_t pixel_x_start = console_col * 8;
for (uint32_t y = 0; y < font->hdr->charsz; y++) {
uint8_t bits = glyph[y];
uint32_t* row = (uint32_t*)((uintptr_t)VGA_FRAMEBUFFER + ((console_row + y) * vga_pitch));
uint8_t* row_bytes = (uint8_t*)VGA_FRAMEBUFFER + ((pixel_y_start + y) * vga_pitch);
uint32_t* pixel_row = (uint32_t*)row_bytes;
for (int x = 0; x < 8; x++) {
if (bits & (0b10000000 >> x)) {
row[console_col + x] = console_text_color;
pixel_row[pixel_x_start + x] = console_text_color;
} else {
pixel_row[pixel_x_start + x] = console_backgrnd_color;
}
}
}
@@ -42,7 +49,7 @@ void console_init() {
console_row = 0;
console_col = 0;
set_console_fg(0xFFFFFFFF);
vga_clear_scrn(0x00000000);
vga_clear_scrn(0x000000FF);
}
void console_putchar(char c) {