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.          */
/* --------------------------------------------------------------------- */

typedef struct thread_context {
    S32 Placeholder;
} thread_context;

#if BUILD_INTERNAL
typedef struct debug_read_file_result {
	U32 ContentsSize;
	void *Contents;
} debug_read_file_result;

debug_read_file_result DEBUGPlatformReadEntireFile(thread_context *Thread,
                                                   const char *Filename);
B32 DEBUGPlatformWriteEntireFile(thread_context *Thread,
                                 const char *Filename, U32 MemorySize,
                                 void *Memory);
void DEBUGPlatformFreeFileMemory(thread_context *Thread, void *Memory);
#endif

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

typedef struct game_offscreen_buffer {
    /* Pixels are always 32-bit and have the bytes in BGRX
     * (little-endian). */
    void *Memory;
    S32 Width;
    S32 Height;
    S32 BytesPerPixel;
    S32 Pitch;
} game_offscreen_buffer;

typedef struct game_sound_output_buffer {
    S32 SamplesPerSecond;
    S32 SampleCount;
    S16 *Samples;
} game_sound_output_buffer;

typedef struct game_button_state {
    S32 HalfTransitionCount;
    B32 EndedDown;
} game_button_state;

typedef struct game_controller_input {
    B32 IsConnected;
    B32 IsAnalog;

    F32 StickAverageX;
    F32 StickAverageY;

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

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

            game_button_state LeftShoulder;
            game_button_state RightShoulder;

            game_button_state Start;
            game_button_state Back;

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

            game_button_state Terminator;
        };
    };
} game_controller_input;

typedef struct game_input {
    game_button_state MouseButtons[5];
    S32 MouseX, MouseY, MouseZ; /* NOTE: MouseZ is the wheel. */

    F32 dtForFrame;

    game_controller_input Controllers[5];
} game_input;

game_controller_input *GetController(game_input *Input, S32 ControllerIndex)
{
    game_controller_input *Result;

    ASSERT((U32)ControllerIndex < ARRAY_SIZE(Input->Controllers));
    Result = &(Input->Controllers[ControllerIndex]);
    return Result;
}

typedef struct game_memory {
    B32 IsInitialized;

    U64 PermanentStorageSize;
    void *PermanentStorage; /* WARNING: This memory is REQUIRED to be zero
                                         initialized!!! (Done by the OS
                                         layer.) */

    U64 TransientStorageSize;
    void *TransientStorage; /* WARNING: This memory is REQUIRED to be zero
                                         initialized!!! (Done by the OS
                                         layer.) */

#if BUILD_INTERNAL
    debug_read_file_result (*DEBUGPlatformReadEntireFile)(thread_context *Thread,const char *);
    B32 (*DEBUGPlatformWriteEntireFile)(thread_context *Thread, const char *, U32, void *);
    void (*DEBUGPlatformFreeFileMemory)(thread_context *Thread, void *);
#endif
} game_memory;

/*typedef struct game_clocks {
    U64 Ticks;
    F32 SecondsElapsed;
} game_clocks;*/

void UpdateAndRender(thread_context *Thread, game_memory *Memory,
                     game_input *Input, game_offscreen_buffer *Buffer,
                     game_sound_output_buffer *SoundBuffer);

/*
 *
 */

typedef struct memory_arena {
    U64 Size;
    U8 *Base;
    U64 Used;
} memory_arena;

static void InitializeArena(memory_arena *Arena, U64 Size, U8 *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_(memory_arena *Arena, U64 Size)
{
    void *Result;

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

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

typedef struct world {
    tile_map *TileMap;
} world;

typedef struct game_state {
    memory_arena WorldArena;
    world *World;

    tile_map_position PlayerP;
    U32 *PixelPointer;
} game_state;

#endif