handmadehero/handmade.h

#ifndef HANDMADE_H_SENTRY
#define HANDMADE_H_SENTRY

#include "core.h"
#include "handmade_tile.h"
/* --------------------------------------------------------------------- */
/* NOTE: Servcies that the platform layer provides to the game.          */
/* --------------------------------------------------------------------- */

struct thread_context {
    int Placeholder;
};

#if BUILD_INTERNAL
struct debug_read_file_result {
    unsigned int ContentsSize;
    void *Contents;
};

struct debug_read_file_result
    DEBUGPlatformReadEntireFile(struct thread_context *Thread,
                                const char *Filename);
int DEBUGPlatformWriteEntireFile(struct thread_context *Thread,
                                 const char *Filename,
                                 unsigned int MemorySize, void *Memory);
void DEBUGPlatformFreeFileMemory(struct thread_context *Thread,
                                 void *Memory);
#endif

struct game_offscreen_buffer game_offscreen_buffer;
void SetProgramIcon(struct game_offscreen_buffer *ProgramIcon);

/* --------------------------------------------------------------------- */
/* NOTE: Servcies that the game provides to the platform layer.          */
/* --------------------------------------------------------------------- */

struct game_offscreen_buffer {
    /* Pixels are always 32-bit and have the bytes in BGRX (little-endian). */
    void *Memory;
    int Width;
    int Height;
    int BytesPerPixel;
    int Pitch;
};

struct game_sound_output_buffer {
    int SamplesPerSecond;
    int SampleCount;
    short *Samples;
};

struct game_button_state {
    int HalfTransitionCount;
    int EndedDown;
};

struct game_controller_input {
    int IsConnected;
    int IsAnalog;

    float StickAverageX;
    float StickAverageY;

    union {
        struct game_button_state Buttons[12];
        struct {
            struct game_button_state MoveUp;
            struct game_button_state MoveDown;
            struct game_button_state MoveLeft;
            struct game_button_state MoveRight;

            struct game_button_state ActionUp;
            struct game_button_state ActionDown;
            struct game_button_state ActionLeft;
            struct game_button_state ActionRight;

            struct game_button_state LeftShoulder;
            struct game_button_state RightShoulder;

            struct game_button_state Start;
            struct game_button_state Back;

            /* NOTE: All buttons must be added above this line. */

            struct game_button_state Terminator;
        };
    };
};

struct game_input {
    struct game_button_state MouseButtons[5];
    int MouseX, MouseY, MouseZ; /* NOTE: MouseZ is the wheel. */

    float dtForFrame;

    struct game_controller_input Controllers[5];
};

struct game_controller_input *GetController(struct game_input *Input,
                                            int ControllerIndex)
{
    struct game_controller_input *Result;

    ASSERT((unsigned int)ControllerIndex < ARRAY_SIZE(Input->Controllers));
    Result = &(Input->Controllers[ControllerIndex]);
    return Result;
}

struct game_memory {
    int IsInitialized;

    unsigned long long PermanentStorageSize;
    void *PermanentStorage; /* WARNING: This memory is REQUIRED to be zero 
                               initialized!!! (Done by the OS layer.) */

    unsigned long long TransientStorageSize;
    void *TransientStorage; /* WARNING: This memory is REQUIRED to be zero
                               initialized!!! (Done by the OS layer.) */

#if BUILD_INTERNAL
    struct debug_read_file_result
        (*DEBUGPlatformReadEntireFile)(struct thread_context *Thread,
                                       const char *);
    int (*DEBUGPlatformWriteEntireFile)(struct thread_context *Thread,
                                        const char *, unsigned int, void *);
    void (*DEBUGPlatformFreeFileMemory)(struct thread_context *Thread,
                                        void *);
    void (*SetProgramIcon)(struct game_offscreen_buffer *ProgramIcon);
#endif
};

/*struct game_clocks {
    unsigned long long Ticks;
    float SecondsElapsed;
};*/

#if OS_WINDOWS
__declspec(dllexport)
#endif
void UpdateAndRender(struct thread_context *Thread,
                     struct game_memory *Memory,
                     struct game_input *Input,
                     struct game_offscreen_buffer *Buffer,
                     struct game_sound_output_buffer *SoundBuffer);

/*
 *
 */

struct memory_arena {
    unsigned long long Size;
    unsigned char *Base;
    unsigned long long Used;
};

static void InitializeArena(struct memory_arena *Arena,
                            unsigned long long Size, unsigned char *Base)
{
    Arena->Size = Size;
    Arena->Base = Base;
    Arena->Used = 0;
}

#define PUSH_STRUCT(Arena, type) (type *)PushSize_(Arena, sizeof(type))
#define PUSH_ARRAY(Arena, Count, type) \
    (type *)PushSize_(Arena, (Count)*sizeof(type))
static void *PushSize_(struct memory_arena *Arena, unsigned long long Size)
{
    void *Result;

    ASSERT((Arena->Used + Size) <= Arena->Size);

    Result = (void *)(Arena->Base + Arena->Used);
    Arena->Used += Size;
    return Result;
}

struct world {
    struct tile_map *TileMap;
};

struct loaded_bitmap {
    int Width;
    int Height;
    unsigned int *Pixels;
};

struct hero_bitmaps {
    int AlignX;
    int AlignY;

    struct loaded_bitmap Head;
    struct loaded_bitmap Cape;
    struct loaded_bitmap Torso;
};

struct entity {
    int Exists;
    struct tile_map_position P;
    struct v2 dP; // velocity
    unsigned int FacingDirection;
    float Height, Width;
};

struct game_state {
    struct game_offscreen_buffer ProgramIcon;
    struct loaded_bitmap ProgramIconBMP;

    struct memory_arena WorldArena;
    struct world *World;

    unsigned int CameraFollowingEntityIndex;
    struct tile_map_position CameraP;

    /*unsigned int
     *PlayerIndexForController[ARRAY_SIZE(((game_input *)0)->Controllers];*/
    unsigned int PlayerIndexForController[5];
    unsigned int EntityCount;
    struct entity Entities[256];

    struct loaded_bitmap Backdrop;

    struct hero_bitmaps HeroBitmaps[4];

    struct v2 rect_pos;
};

#endif