HandmadeHero/project/engine/engine.cpp

#if INTELLISENSE_DIRECTIVES
#include "engine.hpp"
#include "input.hpp"
#include "engine_to_platform_api.hpp"

// TODO(Ed) : This needs to be moved out eventually
#include "handmade.hpp"

#include "tile_map.cpp"
#include "random.cpp"
#endif

NS_ENGINE_BEGIN

#define pressed( btn ) (btn.ended_down && btn.half_transitions > 0)

// Used to determine if analog input is at move threshold
constexpr f32 analog_move_threshold = 0.5f;

struct EngineActions
{
	b32 move_up;
	b32 move_down;
	b32 move_left;
	b32 move_right;

	b32 loop_mode_engine;
	b32 loop_mode_game;

	b32 raise_volume;
	b32 lower_volume;
	b32 raise_tone_hz;
	b32 lower_tone_hz;

	b32 toggle_wave_tone;

#if Build_Development
	b32 pause_renderer;

	b32 load_auto_snapshot;
	b32 set_snapshot_slot_1;
	b32 set_snapshot_slot_2;
	b32 set_snapshot_slot_3;
	b32 set_snapshot_slot_4;

	b32 force_null_access_violation;
#endif
};

struct EngineState
{
	hh::Memory game_memory;

	MemoryArena world_arena;
	World*      world;

	f32 auto_snapshot_interval;
	f32 auto_snapshot_timer;

	s32 wave_tone_hz;
	s32 tone_volume;
	s32 x_offset;
	s32 y_offset;

	b32 renderer_paused;

	f32 sample_wave_sine_time;
	b32 sample_wave_switch;
};

NS_ENGINE_END

// TODO(Ed) : does this need to be here or can it be moved to handmade_engine.cpp?
#include "test_samples.cpp"

#if Build_Development
// TODO(Ed) : Do a proper header/src pair for this
#include "state_and_replay.cpp"
// Build_Development
#endif

NS_ENGINE_BEGIN

internal
void input_poll_engine_actions( InputState* input, EngineActions* actions )
{
	ControllerState* controller = & input->controllers[0];
	KeyboardState*   keyboard   = controller->keyboard;

	// actions->move_right |= keyboard->D.EndedDown;
	// actions->move_left  |= keyboard->A.EndedDown;
	// actions->move_up    |= keyboard->W.EndedDown;
	// actions->move_down  |= keyboard->S.EndedDown;

	actions->raise_volume |= keyboard->up.ended_down;
	actions->lower_volume |= keyboard->down.ended_down;

	actions->raise_tone_hz |= keyboard->right.ended_down;
	actions->lower_tone_hz |= keyboard->left.ended_down;

#if Build_Development
	actions->pause_renderer |= pressed( keyboard->pause );

	actions->set_snapshot_slot_1 |= pressed( keyboard->_1 ) && keyboard->right_alt.ended_down;
	actions->set_snapshot_slot_2 |= pressed( keyboard->_2 ) && keyboard->right_alt.ended_down;
	actions->set_snapshot_slot_3 |= pressed( keyboard->_3 ) && keyboard->right_alt.ended_down;
	actions->set_snapshot_slot_4 |= pressed( keyboard->_4 ) && keyboard->right_alt.ended_down;
#endif

	actions->toggle_wave_tone |= pressed( keyboard->Q );

	actions->loop_mode_game   |= pressed( keyboard->L ) && ! keyboard->right_shift.ended_down && ! keyboard->right_alt.ended_down;
	actions->loop_mode_engine |= pressed( keyboard->L ) &&   keyboard->right_shift.ended_down;

	MousesState* mouse = controller->mouse;

	actions->move_right = (mouse->horizontal_wheel.end > 0.f) * 20;
	actions->move_left  = (mouse->horizontal_wheel.end < 0.f) * 20;

	actions->move_up    = (mouse->vertical_wheel.end > 0.f) * 10;
	actions->move_down  = (mouse->vertical_wheel.end < 0.f) * 10;

	actions->load_auto_snapshot |= pressed( keyboard->L ) && keyboard->right_alt.ended_down;
}

internal
void input_poll_player_actions( InputState* input, hh::PlayerActions* actions )
{
	ControllerState* controller = & input->controllers[0];

	if ( controller->ds_pad )
	{
		DualsensePadState* pad = controller->ds_pad;

		actions->sprint |= pressed( pad->circle );
		actions->jump   |= pressed( pad->cross );

		actions->player_x_move_analog += pad->stick.left.X.end;
		actions->player_y_move_analog += pad->stick.left.Y.end;
	}
	if ( controller->xpad )
	{
		XInputPadState* pad = controller->xpad;

		actions->sprint |= pressed( pad->B );
		actions->jump   |= pressed( pad->A );

		actions->player_x_move_analog += pad->stick.left.X.end;
		actions->player_y_move_analog += pad->stick.left.Y.end;
	}

	if ( controller->keyboard )
	{
		KeyboardState* keyboard = controller->keyboard;
		actions->jump   |= pressed( keyboard->space );
		actions->sprint |= keyboard->left_shift.ended_down;

		actions->player_x_move_digital += keyboard->D.ended_down - keyboard->A.ended_down;
		actions->player_y_move_digital += keyboard->W.ended_down - keyboard->S.ended_down;
	}

	if ( controller->mouse )
	{
		MousesState* mouse = controller->mouse;
	}
}

internal
void output_sound( EngineState* state, AudioBuffer* sound_buffer, GetSoundSampleValueFn* get_sample_value )
{
	s16* sample_out = sound_buffer->samples;
	for ( s32 sample_index = 0; sample_index < sound_buffer->num_samples; ++ sample_index )
	{
		s16 sample_value = get_sample_value( state, sound_buffer );
		sound_buffer->running_sample_index++;

		// char ms_timing_debug[256] {};
		// wsprintfA( ms_timing_debug, "sample_value: %d\n", sample_value );
		// d ms_timing_debug );

		*sample_out = sample_value;
		++ sample_out;

		*sample_out = sample_value;
		++ sample_out;
	}
}

internal
void draw_rectangle( OffscreenBuffer* buffer
	, f32 min_x, f32 min_y
	, f32 max_x, f32 max_y
	, f32 red, f32 green, f32 blue  )
{
	s32 min_x_32 = round( min_x );
	s32 min_y_32 = round( min_y );
	s32 max_x_32 = round( max_x );
	s32 max_y_32 = round( max_y );

	s32 buffer_width  = buffer->width;
	s32 buffer_height = buffer->height;

	if ( min_x_32 < 0 )
		min_x_32 = 0;
	if ( min_y_32 < 0 )
		min_y_32 = 0;
	if ( max_x_32 > buffer_width )
		max_x_32 = buffer_width;
	if ( max_y_32 > buffer_height )
		max_y_32 = buffer_height;

	s32 red_32   = round( 255.f * red );
	s32 green_32 = round( 255.f * green );
	s32 blue_32  = round( 255.f * blue );

	s32 color =
			(scast(s32, red_32)   << 16)
		|	(scast(s32, green_32) << 8)
		|	(scast(s32, blue_32)  << 0);

	// Start with the pixel on the top left corner of the rectangle
	u8* row = rcast(u8*, buffer->memory )
		+ min_x_32 * buffer->bytes_per_pixel
		+ min_y_32 * buffer->pitch;

	for ( s32 y = min_y_32; y < max_y_32; ++ y )
	{
		s32* pixel_32 = rcast(s32*, row);

		for ( s32 x = min_x_32; x < max_x_32; ++ x )
		{
			*pixel_32 = color;
			pixel_32++;
		}
		row += buffer->pitch;
	}
}

internal
void draw_bitmap( OffscreenBuffer* buffer
	, f32 pos_x, f32 pos_y
	, Bitmap* bitmap )
{
	s32 half_width  = bitmap->width / 2;
	s32 half_height = bitmap->height / 2;

	s32 min_x = round( pos_x ) - half_width;
	s32 min_y = round( pos_y ) - half_height;
	s32 max_x = round( pos_x ) + half_width;
	s32 max_y = round( pos_y ) + half_height;

	s32 bmp_offset_x = min_x < 0 ? min_x * -1 : 0;
	u32 bmp_offset_y = min_y < 0 ? bitmap->height + min_y - 1 : bitmap->height - 1;

	s32 buffer_width  = buffer->width;
	s32 buffer_height = buffer->height;

	if ( min_x < 0 )
		min_x = 0;
	if ( min_y < 0 )
		min_y = 0;
	if ( max_x > buffer_width )
		max_x = buffer_width;
	if ( max_y > buffer_height )
		max_y = buffer_height;

	// Start with the pixel on the top left corner of the rectangle
	u8*  dst_row = rcast(u8*, buffer->memory )
	          + min_x * buffer->bytes_per_pixel
	          + min_y * buffer->pitch;
	u32* src_row = bitmap->pixels + bitmap->width * bmp_offset_y;

	for ( s32 y = min_y; y < max_y; ++ y )
	{
		u32* dst = rcast(u32*, dst_row);
		u32* src = src_row + bmp_offset_x;

		for ( s32 x = min_x; x < max_x; ++ x )
		{
		#define extract( pixel, shift ) (( *pixel >> shift ) & 0xFF)
			f32 alpha = scast(f32, extract(src, 24)) / 255.f;

			f32 src_R = scast(f32, extract(src, 16));
			f32 src_G = scast(f32, extract(src, 8));
			f32 src_B = scast(f32, extract(src, 0));

			f32 dst_R = scast(f32, extract(dst, 16));
			f32 dst_G = scast(f32, extract(dst, 8));
			f32 dst_B = scast(f32, extract(dst, 0));
		#undef extract

			f32 red   = (1 - alpha) * dst_R + alpha * src_R;
			f32 green = (1 - alpha) * dst_G + alpha * src_G;
			f32 blue  = (1 - alpha) * dst_B + alpha * src_B;

			*dst = u32(red + 0.5f) << 16 | u32(green + 0.5f) << 8 | u32(blue + 0.5f) << 0;

			++ dst;
			++ src;
		}

		dst_row += buffer->pitch;
		src_row -= bitmap->width;
	}
}

inline
void draw_debug_point(OffscreenBuffer* back_buffer, World* world, TileMapPosition pos, f32 red, f32 green, f32 blue)
{
	TileMap* tile_map = world->tile_map;

	draw_rectangle(back_buffer,
		pos.x          * world->tile_meters_to_pixels + world->tile_lower_left_x + scast(f32, pos.tile_x * world->tile_size_in_pixels),
		pos.y          * world->tile_meters_to_pixels + world->tile_lower_left_y + scast(f32, pos.tile_y * world->tile_size_in_pixels),
		(pos.x + 0.1f) * world->tile_meters_to_pixels + world->tile_lower_left_x + scast(f32, pos.tile_x * world->tile_size_in_pixels),
		(pos.y + 0.1f) * world->tile_meters_to_pixels + world->tile_lower_left_y + scast(f32, pos.tile_y * world->tile_size_in_pixels),
		red, green, blue);
}

internal
Bitmap load_bmp( platform::ModuleAPI* platform_api, Str file_path  )
{
	Bitmap result {};

	platform::File file {
		file_path
	};
	if ( ! platform_api->file_read_content( & file ) )
	{

		return result;
	}

	BitmapHeaderPacked* header = pcast(BitmapHeaderPacked*, file.data);
	assert( header->compression == 3 );

	// TODO(Ed) : Do not directly assign this, allocate the pixels to somewhere in game or engine persistent.
	result.pixels         = rcast(u32*, rcast(Byte*, file.data) + header->bitmap_offset);
	result.width          = header->width;
	result.height         = header->height;
	result.bits_per_pixel = header->bits_per_pixel;

	u32 red_shift   = 0;
	u32 green_shift = 0;
	u32 blue_shift  = 0;
	u32 alpha_shift = 0;

	b32 red_found    = bitscan_forward( & red_shift,   header->red_mask );
	b32 green_found  = bitscan_forward( & green_shift, header->green_mask );
	b32 blue_found   = bitscan_forward( & blue_shift,  header->blue_mask );
	b32 alpha_found  = bitscan_forward( & alpha_shift, ~(header->red_mask | header->green_mask | header->blue_mask) );

	assert( red_found );
	assert( green_found );
	assert( blue_found );
	assert( alpha_found );

	u32* src = result.pixels;
	for ( s32 y = 0; y < header->width; ++ y )
	{
		for ( s32 x = 0; x < header->height; ++ x )
		{
			struct Pixel
			{
				u8 Alpha;
				u8 Blue;
				u8 Green;
				u8 Red;
			};

			Pixel* px = rcast(Pixel*, src);

			u32 alpha = (( *src >> alpha_shift ) & 0xFF) << 24;
			u32 red   = (( *src >> red_shift   ) & 0xFF) << 16;
			u32 green = (( *src >> green_shift ) & 0xFF) << 8;
			u32 blue  = (( *src >> blue_shift  ) & 0xFF) << 0;

			 *src = alpha | red | green | blue;
			++ src;
		}
	}

	//platform_api->file_close( & file );
	return result;
}

Engine_API
void on_module_reload( Memory* memory, platform::ModuleAPI* platfom_api )
{

}

Engine_API
void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI* platform_api )
{
#if Build_Development
	memory->active_snapshot_slot     = 1;
	memory->replay_mode		         = ReplayMode_Off;
	memory->active_input_replay_file = {};
	memory->engine_loop_active       = false;
	memory->game_loop_active         = false;
#endif

#if 0
	for ( s32 slot = 0; slot < memory->Num_Snapshot_Slots; ++ slot )
	{
		// TODO(Ed) : Specify default file paths for saving slots ?
	}
#endif

	EngineState* state = rcast( EngineState*, memory->persistent );
	assert( sizeof(EngineState) <= memory->persistent_size );

	state->auto_snapshot_interval = 60.f;

	state->tone_volume = 1000;

	state->x_offset = 0;
	state->y_offset = 0;

	state->sample_wave_switch    = false;
	state->wave_tone_hz          = 60;
	state->sample_wave_sine_time = 0.f;

	state->renderer_paused = false;
	state->game_memory.persistent_size = memory->persistent_size / Memory::game_memory_factor;
	state->game_memory.persistent      = rcast(Byte*, memory->persistent) + state->game_memory.persistent_size;
	state->game_memory.transient_size  = memory->transient_size / Memory::game_memory_factor;
	state->game_memory.transient       = rcast(Byte*, memory->transient) + state->game_memory.transient_size;

	// World setup
	{
		ssize world_arena_size    = memory->engine_persistent_size() - sizeof(EngineState);
		Byte* world_arena_storage = memory->persistent + sizeof(EngineState);
		MemoryArena::init( & state->world_arena, world_arena_size, world_arena_storage );

		//state->world = MemoryArena_push_struct( & state->world_arena, World);
		state->world = state->world_arena.push_struct( World );
		World* world = state->world;

		TileMap* tile_map = state->world_arena.push_struct( TileMap );
		world->tile_map = tile_map;

		tile_map->chunk_shift     = 4;
		tile_map->chunk_mask      = (1 << tile_map->chunk_shift) - 1;
		tile_map->chunk_dimension = (1 << tile_map->chunk_shift);

		tile_map->tile_chunks_num_x = 128;
		tile_map->tile_chunks_num_y = 128;
		tile_map->tile_chunks_num_z = 2;

		ssize num_chunks = tile_map->tile_chunks_num_x * tile_map->tile_chunks_num_y * tile_map->tile_chunks_num_z;
		tile_map->chunks = state->world_arena.push_array( TileChunk, num_chunks );

		//TileChunk temp_chunk;
		//temp_chunk.tiles  = rcast( u32*, & temp_tiles );
		//tile_map->chunks = & temp_chunk;

		tile_map->tile_size_in_meters = 1.4f;
		world->tile_size_in_pixels    = 80;
		world->tile_meters_to_pixels  = scast(f32, world->tile_size_in_pixels) / tile_map->tile_size_in_meters;

		f32 tile_size_in_pixels = scast(f32, world->tile_size_in_pixels);

		world->tile_lower_left_x = -( tile_size_in_pixels * 0.5f);
		world->tile_lower_left_y = +( tile_size_in_pixels * 0.25f) + scast(f32, back_buffer->height);

		world->tiles_per_screen_x = 17;
		world->tiles_per_screen_y = 9;

		u32 screen_x  = 0;
		u32 screen_y  = 0;
		u32 rng_index = 0;

		b32 door_left   = false;
		b32 door_right  = false;
		b32 door_top    = false;
		b32 door_bottom = false;
		b32 door_up     = false;
		b32 door_down   = false;

		u32 abs_tile_z = 0;

		for ( u32 screen_index = 0; screen_index < 100; ++ screen_index )
		{
			// TODO(Ed) : We need a proper RNG.
			assert( rng_index < array_count(RNG_Table) )
			u32 random_choice;
			if ( door_up || door_down )
			{
				random_choice = RNG_Table[ rng_index ] % 2;
			}
			else
			{
				random_choice = RNG_Table[ rng_index ] % 3;
			}
			++ rng_index;

			b32 created_z_door = false;
			if ( random_choice == 2 )
			{
				created_z_door = true;
				if ( abs_tile_z == 0 )
				{
					door_up = true;
				}
				else
				{
					door_down = true;
				}
			}
			else if ( random_choice == 1 )
			{
				door_right = true;
			}
			else
			{
				door_top = true;
			}

			for (s32 tile_y = 0; tile_y < world->tiles_per_screen_y; ++ tile_y )
			{
				for ( s32 tile_x = 0; tile_x < world->tiles_per_screen_x; ++ tile_x )
				{
					s32 abs_tile_x = screen_x * world->tiles_per_screen_x + tile_x;
					s32 abs_tile_y = screen_y * world->tiles_per_screen_y + tile_y;

					s32 tile_value = 1;

					bool in_middle_x = tile_x == (world->tiles_per_screen_x / 2);
					bool in_middle_y = tile_y == (world->tiles_per_screen_y / 2);

					bool on_right = tile_x == (world->tiles_per_screen_x - 1);
					bool on_left  = tile_x == 0;

					bool on_bottom = tile_y == 0;
					bool on_top    = tile_y == (world->tiles_per_screen_y - 1);

					if ( on_left && (! in_middle_y || ! door_left ))
					{
						tile_value = 2;
					}
					if ( on_right && (! in_middle_y || ! door_right ))
					{
						tile_value = 2;
					}

					if ( on_bottom && (! in_middle_x || ! door_bottom ))
					{
						tile_value = 2;
					}
					if ( on_top && (! in_middle_x || ! door_top ))
					{
						tile_value = 2;
					}

					if ( tile_x == 6 && tile_y == 6 )
					{
						if ( door_up )
						{
							tile_value = 3;
						}
						else if ( door_down )
						{
							tile_value = 4;
						}
					}

					// u32 tile_value = tile_x == tile_y && tile_y % 2 ? 1 : 0;
					TileMap_set_tile_value( & state->world_arena, world->tile_map, abs_tile_x, abs_tile_y, abs_tile_z, tile_value );
				}
			}

			door_left   = door_right;
			door_bottom = door_top;

			if ( created_z_door )
			{
				door_down = ! door_down;
				door_up   = ! door_up;
			}
			else
			{
				door_up   = false;
				door_down = false;
			}

			door_right  = false;
			door_top    = false;

			if ( random_choice == 2 )
			{
				if ( abs_tile_z == 0 )
				{
					abs_tile_z = 1;
				}
				else
				{
					abs_tile_z = 0;
				}
			}
			else if ( random_choice == 1 )
			{
				screen_x += 1;
			}
			else
			{
				screen_y += 1;
			}
		}
	}

	hh::GameState* game_state = rcast( hh::GameState*, state->game_memory.persistent );
	assert( sizeof(hh::GameState) <= state->game_memory.persistent_size );

	// Personally made assets
	{
		StrPath path_test_bg {};
		path_test_bg.concat( platform_api->path_content, str_ascii("test_background.bmp") );
		game_state->test_bg = load_bmp( platform_api, path_test_bg );

		StrPath path_mojito {};
		path_mojito.concat( platform_api->path_content, str_ascii("mojito.bmp") );
		game_state->mojito = load_bmp( platform_api, path_mojito );

		StrPath path_mojito_head {};
		path_mojito_head.concat( platform_api->path_content, str_ascii("mojito_head.bmp") );
		game_state->mojito_head = load_bmp( platform_api, path_mojito_head );

		StrPath path_debug_bitmap {};
		path_debug_bitmap.concat( platform_api->path_content, str_ascii("debug_bitmap2.bmp") );
		game_state->debug_bitmap = load_bmp( platform_api, path_debug_bitmap );
	}

	// Offical assets
	{
		StrPath path_test_bg_hh;
		path_test_bg_hh.concat( platform_api->path_content, str_ascii("offical/test/test_background.bmp"));
		game_state->test_bg_hh = load_bmp( platform_api, path_test_bg_hh );

	#define path_test "offical\\test\\"
		constexpr char const subpath_hero_front_head[] = path_test "test_hero_front_head.bmp";
		constexpr char const subpath_hero_back_head [] = path_test "test_hero_back_head.bmp";
		constexpr char const subpath_hero_right_head[] = path_test "test_hero_right_head.bmp";
		constexpr char const subpath_hero_left_head [] = path_test "test_hero_left_head.bmp";

		constexpr char const subpath_hero_front_cape[] = path_test "test_hero_front_cape.bmp";
		constexpr char const subpath_hero_back_cape [] = path_test "test_hero_back_cape.bmp";
		constexpr char const subpath_hero_left_cape [] = path_test "test_hero_left_cape.bmp";
		constexpr char const subpath_hero_right_cape[] = path_test "test_hero_right_cape.bmp";

		constexpr char const subpath_hero_front_torso[] = path_test "test_hero_front_torso.bmp";
		constexpr char const subpath_hero_back_torso [] = path_test "test_hero_back_torso.bmp";
		constexpr char const subpath_hero_left_torso [] = path_test "test_hero_left_torso.bmp";
		constexpr char const subpath_hero_right_torso[] = path_test "test_hero_right_torso.bmp";
	#undef path_test

	#define load_bmp_asset( sub_path, container )                             \
		{                                                                     \
			StrPath path {};                                                  \
			path.concat( platform_api->path_content, str_ascii( sub_path ) ); \
			container = load_bmp( platform_api, path );                       \
		}

		using hh::HeroBitmaps_Front;
		using hh::HeroBitmaps_Back;
		using hh::HeroBitmaps_Left;
		using hh::HeroBitmaps_Right;

		load_bmp_asset( subpath_hero_front_head, game_state->hero_bitmaps[HeroBitmaps_Front].head );
		load_bmp_asset( subpath_hero_back_head,  game_state->hero_bitmaps[HeroBitmaps_Back ].head );
		load_bmp_asset( subpath_hero_left_head,  game_state->hero_bitmaps[HeroBitmaps_Left ].head );
		load_bmp_asset( subpath_hero_right_head, game_state->hero_bitmaps[HeroBitmaps_Right].head );

		load_bmp_asset( subpath_hero_front_cape, game_state->hero_bitmaps[HeroBitmaps_Front].cape );
		load_bmp_asset( subpath_hero_back_cape,  game_state->hero_bitmaps[HeroBitmaps_Back ].cape );
		load_bmp_asset( subpath_hero_left_cape,  game_state->hero_bitmaps[HeroBitmaps_Left ].cape );
		load_bmp_asset( subpath_hero_right_cape, game_state->hero_bitmaps[HeroBitmaps_Right].cape );

		load_bmp_asset( subpath_hero_front_torso, game_state->hero_bitmaps[HeroBitmaps_Front].torso );
		load_bmp_asset( subpath_hero_back_torso,  game_state->hero_bitmaps[HeroBitmaps_Back ].torso );
		load_bmp_asset( subpath_hero_left_torso,  game_state->hero_bitmaps[HeroBitmaps_Left ].torso );
		load_bmp_asset( subpath_hero_right_torso, game_state->hero_bitmaps[HeroBitmaps_Right].torso );

		s32 align_x = 0;
		s32 align_y = 76;
		game_state->hero_bitmaps[HeroBitmaps_Front].align_x = align_x;
		game_state->hero_bitmaps[HeroBitmaps_Back ].align_x = align_x;
		game_state->hero_bitmaps[HeroBitmaps_Left ].align_x = align_x;
		game_state->hero_bitmaps[HeroBitmaps_Right].align_x = align_x;
		game_state->hero_bitmaps[HeroBitmaps_Front].align_y = align_y;
		game_state->hero_bitmaps[HeroBitmaps_Back ].align_y = align_y;
		game_state->hero_bitmaps[HeroBitmaps_Left ].align_y = align_y;
		game_state->hero_bitmaps[HeroBitmaps_Right].align_y = align_y;

	#undef load_bmp_asset

		game_state->hero_direction = HeroBitmaps_Front;
	}

	game_state->camera_pos.tile_x = state->world->tiles_per_screen_x / 2;
	game_state->camera_pos.tile_y = state->world->tiles_per_screen_y / 2;

	hh::PlayerState* player = & game_state->player_state;
	player->position.tile_x     = 4;
	player->position.tile_y     = 4;
	player->position.x          = 0.f;
	player->position.y          = 0.f;

	player->mid_jump   = false;
	player->jump_time  = 0.f;

	player->height = 1.4f;
	player->width  = player->height * 0.7f;
}

Engine_API
void shutdown( Memory* memory, platform::ModuleAPI* platform_api )
{
}

Engine_API
void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back_buffer
	, Memory* memory, platform::ModuleAPI* platform_api, ThreadContext* thread )
{
	EngineState* state = rcast( EngineState*, memory->persistent );
	assert( sizeof(EngineState) <= memory->persistent_size );

	// Engine auto_snapshot
	{
		state->auto_snapshot_timer += delta_time;
		if ( state->auto_snapshot_timer >= state->auto_snapshot_interval )
		{
			state->auto_snapshot_timer = 0.f;

			s32 current_slot = memory->active_snapshot_slot;
			memory->active_snapshot_slot = 0;

			take_engine_snapshot( memory, platform_api );
			memory->active_snapshot_slot = current_slot;
			state->auto_snapshot_timer = 0.f;
		}
	}

	ControllerState* controller = & input->controllers[0];

	EngineActions     engine_actions {};
	hh::PlayerActions player_actions {};

	input_poll_engine_actions( input, & engine_actions );

	if ( engine_actions.load_auto_snapshot )
	{
		s32 current_slot = memory->active_snapshot_slot;
		memory->active_snapshot_slot = 0;
		load_engine_snapshot( memory, platform_api );
		memory->active_snapshot_slot = current_slot;
	}

#if Build_Development
	// Ease of use: Allow user to press L key without shift if engine loop recording is active.
	engine_actions.loop_mode_engine |= engine_actions.loop_mode_game && memory->engine_loop_active;

	if ( engine_actions.loop_mode_engine && ! memory->game_loop_active )
	{
		process_loop_mode( & take_engine_snapshot, & load_engine_snapshot, memory, state, input, platform_api );
		memory->engine_loop_active = memory->replay_mode > ReplayMode_Off;
	}

	// Input recording and playback for engine state
	if ( memory->engine_loop_active )
	{
		if ( memory->replay_mode == ReplayMode_Record )
		{
			record_input( memory, input, platform_api );
		}
		if ( memory->replay_mode == ReplayMode_Playback )
		{
			play_input( & load_engine_snapshot, memory, input, platform_api );
		}
	}
#endif

	// Process Engine Actions
	{
		state->x_offset += 3 * engine_actions.move_right;
		state->x_offset -= 3 * engine_actions.move_left;
		state->y_offset += 3 * engine_actions.move_down;
		state->y_offset -= 3 * engine_actions.move_up;

		if ( engine_actions.raise_volume )
		{
			state->tone_volume += 10;
		}
		if ( engine_actions.lower_volume )
		{
			state->tone_volume -= 10;
			if ( state->tone_volume <= 0 )
				state->tone_volume = 0;
		}

		if ( engine_actions.raise_tone_hz )
		{
			state->wave_tone_hz += 1;
		}
		if ( engine_actions.lower_tone_hz )
		{
			state->wave_tone_hz -= 1;
			if ( state->wave_tone_hz <= 0 )
				state->wave_tone_hz = 1;
		}

		if ( engine_actions.toggle_wave_tone )
		{
			state->sample_wave_switch ^= true;
		}

		if ( engine_actions.loop_mode_game && ! memory->engine_loop_active )
		{
			process_loop_mode( & take_game_snapshot, & load_game_snapshot, memory, state, input, platform_api );
			memory->game_loop_active = memory->replay_mode > ReplayMode_Off;
		}

	#if Build_Development
		if ( engine_actions.pause_renderer )
		{
			if ( state->renderer_paused )
			{
				platform_api->debug_set_pause_rendering(false);
				state->renderer_paused = false;
			}
			else
			{
				platform_api->debug_set_pause_rendering(true);
				state->renderer_paused = true;
			}
		}

		if ( ! memory->game_loop_active )
		{
			if ( engine_actions.set_snapshot_slot_1 ) memory->active_snapshot_slot = 1;
			if ( engine_actions.set_snapshot_slot_2 ) memory->active_snapshot_slot = 2;
		}
	#endif
	}

#if Build_Development
	if ( ! memory->engine_loop_active )
	{
		// Input recording and playback for game state
		if ( memory->replay_mode == ReplayMode_Record )
		{
			record_input( memory, input, platform_api );
		}
		if ( memory->replay_mode == ReplayMode_Playback )
		{
			play_input( & load_game_snapshot, memory, input, platform_api );
		}
	}
#endif

	hh::GameState*   game_state = rcast( hh::GameState*, state->game_memory.persistent );
	hh::PlayerState* player     = & game_state->player_state;

	f32 x_offset_f = scast(f32, state->x_offset);
	f32 y_offset_f = scast(f32, state->y_offset);

	World*   world    = state->world;
	TileMap* tile_map = world->tile_map;

	f32 tile_size_in_pixels   = scast(f32, world->tile_size_in_pixels);
	f32 player_half_width     = player->width  / 2.f;
	f32 player_quarter_height = player->height / 4.f;

	using hh::EHeroBitmapsDirection;
	using hh::HeroBitmaps_Front;
	using hh::HeroBitmaps_Back;
	using hh::HeroBitmaps_Left;
	using hh::HeroBitmaps_Right;

	input_poll_player_actions( input, & player_actions );
	{
		f32 move_speed = 6.f;

		if ( player_actions.sprint )
		{
			move_speed = 24.f;
		}

		f32 new_player_pos_x = player->position.x;
		f32 new_player_pos_y = player->position.y;
		if ( player_actions.player_x_move_analog || player_actions.player_y_move_analog )
		{
			new_player_pos_x += scast(f32, player_actions.player_x_move_analog * delta_time * move_speed);
			new_player_pos_y += scast(f32, player_actions.player_y_move_analog * delta_time * move_speed);
		}
		else
		{
			new_player_pos_x += scast(f32, player_actions.player_x_move_digital) * delta_time * move_speed;
			new_player_pos_y += scast(f32, player_actions.player_y_move_digital) * delta_time * move_speed;
		}
		new_player_pos_y += sinf( player->jump_time * TAU ) * 10.f * delta_time;

		b32 valid_new_pos = true;
		{
			TileMapPosition test_pos = {
			                           new_player_pos_x, new_player_pos_y,
									   player->position.tile_x, player->position.tile_y, player->position.tile_z
			};
			test_pos = recannonicalize_position( tile_map, test_pos );

			// TODO(Ed) : Need a delta-function that auto-reconnonicalizes.

			TileMapPosition test_pos_nw {
				new_player_pos_x - player_half_width, new_player_pos_y + player_quarter_height,
				player->position.tile_x, player->position.tile_y, player->position.tile_z
			};
			test_pos_nw       = recannonicalize_position( tile_map, test_pos_nw );
			valid_new_pos    &= TileMap_is_point_empty( tile_map, test_pos_nw );

			TileMapPosition test_pos_ne {
				new_player_pos_x + player_half_width, new_player_pos_y + player_quarter_height,
				player->position.tile_x, player->position.tile_y, player->position.tile_z
			};
			test_pos_ne    = recannonicalize_position( tile_map, test_pos_ne );
			valid_new_pos &= TileMap_is_point_empty( tile_map, test_pos_ne );

			TileMapPosition test_pos_sw {
				new_player_pos_x - player_half_width, new_player_pos_y,
				player->position.tile_x, player->position.tile_y, player->position.tile_z
			};
			test_pos_sw    = recannonicalize_position( tile_map, test_pos_sw );
			valid_new_pos &= TileMap_is_point_empty( tile_map, test_pos_sw );

			TileMapPosition test_pos_se {
				new_player_pos_x + player_half_width, new_player_pos_y,
				player->position.tile_x, player->position.tile_y, player->position.tile_z
			};
			test_pos_se    = recannonicalize_position( tile_map, test_pos_se );
			valid_new_pos &= TileMap_is_point_empty( tile_map, test_pos_se );
		}

		if ( valid_new_pos )
		{
			TileMapPosition new_pos = {
			                          new_player_pos_x, new_player_pos_y,
									  player->position.tile_x, player->position.tile_y, player->position.tile_z
			};
			new_pos = recannonicalize_position( tile_map, new_pos );

			bool on_new_tile = TileMap_are_on_same_tile( & new_pos, & player->position );
			if ( ! on_new_tile )
			{
				u32 new_tile_value = TileMap_get_tile_value( tile_map, new_pos );

				if ( new_tile_value == 3 )
				{
					++ new_pos.tile_z;
				}
				else if ( new_tile_value == 4 )
				{
					-- new_pos.tile_z;
				}
			}

			player->position = new_pos;

			if ( player_actions.player_y_move_digital > 0 || player_actions.player_y_move_analog > 0 )
			{
				game_state->hero_direction = HeroBitmaps_Back;
			}
			if ( player_actions.player_y_move_digital < 0 || player_actions.player_y_move_analog < 0 )
			{
				game_state->hero_direction = HeroBitmaps_Front;
			}
			if ( player_actions.player_x_move_digital > 0 || player_actions.player_x_move_analog > 0 )
			{
				game_state->hero_direction = HeroBitmaps_Right;
			}
			if ( player_actions.player_x_move_digital < 0 || player_actions.player_x_move_analog < 0 )
			{
				game_state->hero_direction = HeroBitmaps_Left;
			}
		}

		if ( player->jump_time > 0.f )
		{
			player->jump_time -= delta_time;
		}
		else
		{
			player->jump_time = 0.f;
			player->mid_jump  = false;
		}

		if ( ! player->mid_jump && player_actions.jump )
		{
			player->jump_time = 1.f;
			player->mid_jump  = true;
		}

		TileMapPosition player_to_camera = subtract( player->position, game_state->camera_pos );

		game_state->camera_pos.tile_z = player->position.tile_z;

		if ( player_to_camera.tile_x > world->tiles_per_screen_x / 2 )
		{
			game_state->camera_pos.tile_x += world->tiles_per_screen_x;
		}
		if ( player_to_camera.tile_y > world->tiles_per_screen_y / 2 )
		{
			game_state->camera_pos.tile_y += world->tiles_per_screen_y;
		}
		if ( player_to_camera.tile_x < -world->tiles_per_screen_x / 2 )
		{
			game_state->camera_pos.tile_x -= world->tiles_per_screen_x;
		}
		if ( player_to_camera.tile_y < -world->tiles_per_screen_y / 2 )
		{
			game_state->camera_pos.tile_y -= world->tiles_per_screen_y;
		}
	}


	draw_rectangle( back_buffer
		, 0.f, 0.f
		, scast(f32, back_buffer->width), scast(f32, back_buffer->height)
		, 1.f, 0.24f, 0.24f );

	draw_bitmap( back_buffer
		, scast(f32, back_buffer->width) / 2.f, scast(f32, back_buffer->height) / 2.f
		, & game_state->test_bg
	);

	draw_bitmap( back_buffer
		, scast(f32, back_buffer->width) / 2.f, scast(f32, back_buffer->height) / 2.f
		, & game_state->test_bg_hh
	);

// Screen Camera
	f32 screen_center_x = 0.5f * scast(f32, back_buffer->width);
	f32 screen_center_y = 0.5f * scast(f32, back_buffer->height);

	for ( s32 relative_row = -10; relative_row < +10; ++ relative_row )
	{
		for ( s32 relative_col = -20; relative_col < +20; ++ relative_col )
		{
			s32 col = game_state->camera_pos.tile_x + relative_col;
			s32 row = game_state->camera_pos.tile_y + relative_row;

			s32 tile_id  = TileMap_get_tile_value( tile_map, col, row, game_state->camera_pos.tile_z );
			f32 color[3] = { 0.15f, 0.15f, 0.15f };

			if ( tile_id > 1 || row == player->position.tile_y && col == player->position.tile_x )
//			if ( tile_id > 1 )
			{
				if ( tile_id == 2 )
				{
					color[0] = 0.42f;
					color[1] = 0.42f;
					color[2] = 0.52f;
				}
				if ( tile_id == 3 )
				{
					color[0] = 0.02f;
					color[1] = 0.02f;
					color[2] = 0.02f;
				}
				if ( tile_id == 4 )
				{
					color[0] = 0.42f;
					color[1] = 0.62f;
					color[2] = 0.42f;
				}

				if ( row == player->position.tile_y && col == player->position.tile_x )
				{
					color[0] = 0.44f;
					color[1] = 0.3f;
					color[2] = 0.3f;
				}

				f32 center_x = screen_center_x + scast(f32, relative_col) * tile_size_in_pixels - game_state->camera_pos.x * world->tile_meters_to_pixels;
				f32 center_y = screen_center_y - scast(f32, relative_row) * tile_size_in_pixels + game_state->camera_pos.y * world->tile_meters_to_pixels;

				f32 min_x = center_x - tile_size_in_pixels * 0.5f;
				f32 min_y = center_y - tile_size_in_pixels * 0.5f;
				f32 max_x = center_x + tile_size_in_pixels * 0.5f;
				f32 max_y = center_y + tile_size_in_pixels * 0.5f;

				draw_rectangle( back_buffer
	               , min_x, min_y
	               , max_x, max_y
	               , color[0], color[1], color[2] );
			}
		}
	}

	// Bad bitmap test
	#if 0
	{
		u32* src = game_state->mojito_head.pixels;
		u32* dst = rcast(u32*, back_buffer->memory);
		for ( s32 y = 0; y < game_state->mojito_head.height; ++ y )
		{
			for ( s32 x = 0; x < game_state->mojito_head.width; ++ x )
			{
				*dst = *src;
				++ dst;
				++ src;
			}
		}
	}
	#endif

	// Player
	f32 player_red   = 0.7f;
	f32 player_green = 0.7f;
	f32 player_blue  = 0.3f;

	TileMapPosition player_to_camera = subtract( player->position, game_state->camera_pos );

	f32 offcenter_amount_x  = player_to_camera.x + scast(f32, player_to_camera.tile_x) * world->tile_map->tile_size_in_meters;
	f32 offcenter_amount_y  = player_to_camera.y + scast(f32, player_to_camera.tile_y) * world->tile_map->tile_size_in_meters;
	    offcenter_amount_x *= world->tile_meters_to_pixels;
	    offcenter_amount_y *= world->tile_meters_to_pixels * -1;

	f32 player_ground_pos_x = screen_center_x + offcenter_amount_x;
	f32 player_ground_pos_y = screen_center_y + offcenter_amount_y;

	hh::HeroBitmaps* hero_bitmaps = & game_state->hero_bitmaps[game_state->hero_direction];

#if 1
	draw_rectangle( back_buffer
		, player_ground_pos_x - player_half_width * world->tile_meters_to_pixels, player_ground_pos_y - player->height * world->tile_meters_to_pixels
		, player_ground_pos_x + player_half_width * world->tile_meters_to_pixels, player_ground_pos_y
		, player_red, player_green, player_blue );
#endif

	draw_bitmap( back_buffer
	            , player_ground_pos_x, player_ground_pos_y - scast(f32, hero_bitmaps->align_y)
	            , & hero_bitmaps->torso );
	draw_bitmap( back_buffer
	            , player_ground_pos_x, player_ground_pos_y - scast(f32, hero_bitmaps->align_y)
	            , & hero_bitmaps->cape );
#if 0
	draw_bitmap( back_buffer
	            , player_ground_pos_x, player_ground_pos_y - 45.f
	            , & game_state->mojito_head );
#else
	draw_bitmap( back_buffer
	            , player_ground_pos_x, player_ground_pos_y - scast(f32, hero_bitmaps->align_y)
	            , & hero_bitmaps->head );
#endif

	// Auto-Snapshot percent bar
	if (1)
	{
		f32 snapshot_percent_x = ((state->auto_snapshot_timer / state->auto_snapshot_interval)) * (f32)back_buffer->width / 4.f;
		draw_rectangle( back_buffer
			, 0.f, 0.f
			, snapshot_percent_x, 10.f
			, 0.f, 0.15f, 0.35f );
	}

#if Build_Development
	if ( memory->replay_mode == ReplayMode_Record )
	{
		draw_rectangle( back_buffer
			, player->position.x + 50.f, player->position.y - 50.f
			, player->position.x + 10.f, player->position.y + 40.f
			, 1.f, 1.f, 1.f );
	}
#endif

	// Change above to use draw rectangle
	if ( 0 )
	{
		draw_rectangle( back_buffer
			, (f32)input->controllers[0].mouse->X.end, (f32)input->controllers[0].mouse->Y.end
			, (f32)input->controllers[0].mouse->X.end + 10.f, (f32)input->controllers[0].mouse->Y.end + 10.f
			, 1.f, 1.f, 0.f );
	}

	// Mouse buttons test
	#if 0
	{
		if ( input->controllers[0].mouse->left.ended_down == true )
			render_player( back_buffer, 5, 5 );

		if ( input->controllers[0].mouse->middle.ended_down == true )

			render_player( back_buffer, 5, 20 );

		if ( input->controllers[0].mouse->right.ended_down == true )
			render_player( back_buffer, 5, 35 );
	}
	#endif
}

Engine_API
void update_audio( f32 delta_time, AudioBuffer* audio_buffer, Memory* memory, platform::ModuleAPI* platform_api, ThreadContext* thread )
{
	EngineState* state = rcast( EngineState*, memory->persistent );
	do_once_start

	do_once_end

	// TODO(Ed) : Allow sample offsets here for more robust platform options
	if ( ! state->sample_wave_switch )
		output_sound( state, audio_buffer, sine_wave_sample_value );
	else
		output_sound( state, audio_buffer, square_wave_sample_value );
}

NS_ENGINE_END

#undef pressed