space.h

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#ifndef SPACE_H
#define SPACE_H
 
#include "cpu_8080.h"
#include <SDL2/SDL.h>
#include <SDL2/SDL_timer.h>
 
#define ALIGNED_PREFIX (1<<16)  
#define ROM_OFFSET  0x0     
#define VRAM_OFFSET 0x2400  
#define VRAM_SIZE   0x1C00  
#define VRAM_DELAY  0x9     
#define half_1      0x2     
#define full_2      0x4     
// Invaders Stuff
#define WINDOW_WIDTH (256)  
#define WINDOW_HEIGHT (224) 
#define GREEN_PIXEL 0xFF00  
#define BLACK_PIXEL 0x0     
 
#define CREDIT_COIN SDLK_c
#define P1_START    SDLK_RETURN
#define P2_START    SDLK_s
#define P1_LEFT     SDLK_LEFT
#define P1_RIGHT    SDLK_RIGHT
#define P1_SHOOT    SDLK_UP
#define P2_LEFT     SDLK_a
#define P2_RIGHT    SDLK_d
#define P2_SHOOT    SDLK_w
 
typedef struct {
    SDL_Window *window;     
    SDL_Surface *surf;      
    uint32_t* pixels;       
    uint8_t quit_event;     
    SDL_Event event;        
    SDL_TimerID vram_timer; 
} invaders_window;
 
typedef struct {
 
    uint8_t port_0;
    uint8_t port_1;
    uint8_t port_2;
 
    uint8_t port_3;
    uint8_t port_5;
 
    // Shift Regs
    uint8_t shift_config;   
    union{
        struct{
            uint8_t y;      
            uint8_t x;      
        };
        uint16_t hidden_reg;    
    };
} port_IO;
 
int copy_invaders_rom(char *path, cpu_state* cpu);
 
uint8_t space_IN(uint8_t port);
 
void space_OUT(uint8_t port, uint8_t data);
 
void process_key_event(SDL_KeyboardEvent key_event);
 
// SDL Init
void set_pixel(uint32_t *pixels, uint32_t x, uint32_t y, uint8_t state);
 
void render_vram(cpu_state *cpu, uint32_t *pixels);
 
uint32_t update_vram_cb(uint32_t interval, UNUSED void *param);
 
invaders_window* init_game_window();
 
void destroy_game_window(invaders_window *game_window);
 
void process_SDL_event(cpu_state *cpu, invaders_window *game_window);
 
#endif