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Luke Street
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
#pragma once
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#include <common.h>
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#include "../bmp.h"
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#define MAX_ROWS 25
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#define MAX_COLS 80
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// Screen device I/O ports
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#define REG_SCREEN_CTRL 0x3D4
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#define REG_SCREEN_DATA 0x3D5
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#define VGA_FB_TYPE_INDEXED 0
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#define VGA_FB_TYPE_RGB 1
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#define VGA_FB_TYPE_EGA_TEXT 2
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typedef struct framebuffer_info {
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uint32_t pitch;
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uint32_t width;
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uint32_t height;
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uint8_t bpp;
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uint32_t palette_addr;
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uint16_t palette_num_colors;
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uint8_t red_field_position;
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uint8_t red_mask_size;
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uint8_t green_field_position;
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uint8_t green_mask_size;
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uint8_t blue_field_position;
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uint8_t blue_mask_size;
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} framebuffer_info_t;
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typedef struct vga_rgb_color {
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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} vga_rgb_color_t;
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void vga_init(void *fb_addr, uint8_t type, framebuffer_info_t *fb_info);
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int vga_load_font(const char *filename);
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void vga_fill_rect(int x1, int y1, int x2, int y2, vga_rgb_color_t *color);
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void vga_display_image_bgra(int x, int y, bmp_info_header_t *header, uint8_t *image);
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// --- Console
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int vga_print_char(char c, int offset, char attr);
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int vga_handle_scrolling(int cursor_offset);
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int vga_get_cursor_offset();
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void vga_set_cursor_offset(int offset);
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void vga_clear_screen();
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enum vga_text_color {
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VGA_COLOR_BLACK = 0,
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VGA_COLOR_BLUE = 1,
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VGA_COLOR_GREEN = 2,
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VGA_COLOR_CYAN = 3,
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VGA_COLOR_RED = 4,
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VGA_COLOR_MAGENTA = 5,
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VGA_COLOR_BROWN = 6,
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VGA_COLOR_LIGHT_GREY = 7,
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VGA_COLOR_DARK_GREY = 8,
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VGA_COLOR_LIGHT_BLUE = 9,
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VGA_COLOR_LIGHT_GREEN = 10,
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VGA_COLOR_LIGHT_CYAN = 11,
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VGA_COLOR_LIGHT_RED = 12,
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VGA_COLOR_LIGHT_MAGENTA = 13,
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VGA_COLOR_LIGHT_BROWN = 14,
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VGA_COLOR_WHITE = 15,
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};
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typedef enum vga_text_color vga_text_color_t;
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static inline uint8_t vga_entry_color(vga_text_color_t fg, vga_text_color_t bg) {
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return fg | bg << 4;
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}
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// Attribute byte for our default colour scheme.
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#define WHITE_ON_BLACK (vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK))
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#define RED_ON_BLACK (vga_entry_color(VGA_COLOR_RED, VGA_COLOR_BLACK))
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#define RED_ON_WHITE (vga_entry_color(VGA_COLOR_RED, VGA_COLOR_WHITE))
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static inline uint16_t vga_entry(unsigned char uc, uint8_t color) {
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return (uint16_t) uc | (uint16_t) color << 8;
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}
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static inline int vga_get_offset(int col, int row) {
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return row * MAX_COLS + col;
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}
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static inline int vga_get_offset_row(int offset) {
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return offset / MAX_COLS;
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}
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static inline int vga_get_offset_col(int offset) {
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return offset - (vga_get_offset_row(offset) * MAX_COLS);
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} |