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#ifndef VGA_H
#define VGA_H
#include <stdbool.h>
#include "string.h"
#include <stddef.h>
#include "interrupts.h"
#include "port.h"
#include "video.h"
#define NOF_MODE_REGS 66
typedef struct {
video_mode_t base;
uint8_t regs[NOF_MODE_REGS];
uint8_t *segment;
size_t segment_size;
} vga_mode_t;
typedef struct {
video_t base;
port8_t misc_port;
port8_t crtc_index_port;
port8_t crtc_data_port;
port8_t sequencer_index_port;
port8_t sequencer_data_port;
port8_t graphics_controller_index_port;
port8_t graphics_controller_data_port;
port8_t attribute_controller_index_port;
port8_t attribute_controller_read_port;
port8_t attribute_controller_write_port;
port8_t attribute_controller_reset_port;
vga_mode_t *mode;
bool use_z_buffer;
uint8_t *zbuffer;
// stores either the address to the beginning of the segment
// (real mapped I/O memory or the beginning of the Z buffer
uint8_t *base_addr;
} vga_t;
typedef struct {
video_vtable_t base;
} vga_vtable_t;
void vga_init( vga_t *vga, interrupt_t *interrupt, void *context );
void vga_activate( void *obj );
void vga_deactivate( void *obj );
void vga_deinit( void *obj );
void vga_print_info( void *obj );
bool vga_switch_mode( void *obj, const video_mode_t *mode );
typedef struct {
int R;
int G;
int B;
} vga_color_t;
extern const vga_color_t VGA_COLOR_BLACK;
extern const vga_color_t VGA_COLOR_BLUE;
extern const vga_color_t VGA_COLOR_GREEN;
extern const vga_color_t VGA_COLOR_CYAN;
extern const vga_color_t VGA_COLOR_RED;
extern const vga_color_t VGA_COLOR_MAGENTA;
extern const vga_color_t VGA_COLOR_BROWN;
extern const vga_color_t VGA_COLOR_LIGHT_GREY;
extern const vga_color_t VGA_COLOR_WHITE;
vga_color_t vga_make_RGB( int R, int G, int B );
void vga_set_pixel( vga_t *vga, const int x, const int y, const vga_color_t color );
void vga_draw_rectangle( vga_t *vga, const int x, const int y, const int w, const int h, const vga_color_t color );
void vga_clear_screen( vga_t *vga, const vga_color_t color );
void vga_draw_char( vga_t *vga, const unsigned char c, const int x, const int y, const vga_color_t background, const vga_color_t foreground );
void vga_wait_for_retrace( vga_t *vga );
void vga_use_z_buffer( vga_t *vga, bool use );
void vga_refresh( vga_t *vga );
#endif // VGA_H
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