nese/src/input.h

#ifndef NES_INPUT_H_
#define NES_INPUT_H_

#include <stdint.h>
#include <stdio.h>


// Emulator Implementation

typedef enum {
    input_Result_Error  = -1,
    input_Result_OK,
    input_Result_Quit,
    input_Result_Menu,
    input_Result_Reset,
    input_Result_Save,
    input_Result_Load,
    input_Result_Cancel,
} nes_Input_Result;

#define nes_controller_num_buttons  (8U)

typedef enum {
    Button_A = 0,
    Button_B,
    Button_Select,
    Button_Start,
    Button_Up,
    Button_Down,
    Button_Left,
    Button_Right,
} nes_Input_Button;

typedef enum {
    Controller_Primary    = 0b001,
    Controller_Expansion  = 0b010,
    Controller_Microphone = 0b100,
} nes_Controller_State;

typedef struct {
    uint32_t buttons;
    int shift;
} nes_controller;

typedef struct {
    nes_controller controllers[2];
} nes_input;


#define nes_controller_bus_mask (0b11111000)


uint8_t nes_input_read(nes_input* input, uint16_t addr);

void nes_input_write(nes_input* input, uint16_t addr, uint8_t val);


// System Glue

typedef struct nes_Input_Reader_t {
    int (*init)(struct nes_Input_Reader_t*);
    void (*done)(struct nes_Input_Reader_t*);
    int (*update)(struct nes_Input_Reader_t*, nes_input*);
    void* data;
} nes_Input_Reader;

static inline int nes_input_init(nes_Input_Reader* reader) {
    return reader->init(reader);
}

static inline void nes_input_done(nes_Input_Reader* reader) {
    reader->done(reader);
}

static inline int nes_input_update(nes_Input_Reader* reader,
                                   nes_input* input) {
    return reader->update(reader, input);
}


#endif // NES_INPUT_H_