Day 39 complete

README.md

@@ -33,7 +33,7 @@ Module build order:
 
 ## Milestone
 
-Day 38 : Basic Linear Bitmap Blending
+Day 39 : Basic Bitmap Rendering Cleanup
 
 Features Done so far:
 
@@ -59,12 +59,16 @@ Features Done so far:
   * Record & replay input.
   * WIP : 2.5D Tile Map
     * Virtualized into chunks
+    * Some basic collision detection & math (pre-math coverage by Casey)
   * Bitmap file loading
     * Compression mode 3
-    * Linear alpha blending
+    * Basic rendering
+      * Linear alpha blending
+      * Anchored to center position
 
 ## Gallery
 
+![img](docs/imgs/handmade_win32_2023-10-21_22-18-47.gif)
 ![img](docs/imgs/handmade_win32_2023-10-21_02-16-43.png)
 ![img](docs/imgs/handmade_win32_2023-10-20_23-14-37.png)
 ![img](docs/imgs/Code_2023-10-20_21-57-06.png)

docs/Day 039.md

@@ -0,0 +1,18 @@
+# Day 39
+
+My `draw_bitmap` proc has been already setup to have the position specified
+from the assumped position of the center of the image.  
+Its how I'm used to anchoring images by default so thats why I decided to go with it.
+
+Casey however is using the corner however...  
+and then is doing some offset alignment based on what he sees for the coordinates on GIMP..
+
+I decided to hand calibrate the alignment by eye. Since I already have it centered on X, the `align_x` could  
+stay zeroed for now and all I needed to do was align_y.
+
+I also did not do the difference using a `tile_map_diff` like he did,
+I just returned a tile_map_position and switch the map coodinates to be signed 
+(which tbh is fine I'll just adjust the math later when I need to).
+
+I'm assuming it won't matter because the tile map setup we currently have is before he revamps the project with proper
+vector math data structures, and he might switch to signed coordinates for them in the stream.

project/engine/engine.cpp

@@ -249,8 +249,8 @@ void draw_bitmap( OffscreenBuffer* buffer
 	s32 max_x = round( pos_x ) + half_width;
 	s32 max_y = round( pos_y ) + half_height;
 
-	s32 bmp_start_x = min_x < 0 ? min_x * -1 : 0;
+	s32 bmp_offset_x = min_x < 0 ? min_x * -1 : 0;
-	u32 bmp_start_y = min_y < 0 ? bitmap->height + min_y - 1 : bitmap->height - 1;
+	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;
@@ -268,12 +268,12 @@ void draw_bitmap( OffscreenBuffer* buffer
 	u8*  dst_row = rcast(u8*, buffer->memory )
 	          + min_x * buffer->bytes_per_pixel
 	          + min_y * buffer->pitch;
-	u32* src_row = bitmap->pixels + bitmap->width * (bitmap->height - 1);
+	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;
+		u32* src = src_row + bmp_offset_x;
 
 		for ( s32 x = min_x; x < max_x; ++ x )
 		{
@@ -418,8 +418,8 @@ void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI*
 	state->x_offset = 0;
 	state->y_offset = 0;
 
-	state->sample_wave_switch = false;
+	state->sample_wave_switch    = false;
-	state->wave_tone_hz = 60;
+	state->wave_tone_hz          = 60;
 	state->sample_wave_sine_time = 0.f;
 
 	state->renderer_paused = false;
@@ -457,7 +457,7 @@ void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI*
 		//tile_map->chunks = & temp_chunk;
 
 		tile_map->tile_size_in_meters = 1.4f;
-		world->tile_size_in_pixels    = 85;
+		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);
@@ -465,8 +465,8 @@ void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI*
 		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);
 
-		u32 tiles_per_screen_x = 17;
+		world->tiles_per_screen_x = 17;
-		u32 tiles_per_screen_y = 9;
+		world->tiles_per_screen_y = 9;
 
 		u32 screen_x  = 0;
 		u32 screen_y  = 0;
@@ -518,23 +518,23 @@ void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI*
 				door_top = true;
 			}
 
-			for (u32 tile_y = 0; tile_y < tiles_per_screen_y; ++ tile_y )
+			for (s32 tile_y = 0; tile_y < world->tiles_per_screen_y; ++ tile_y )
 			{
-				for ( u32 tile_x = 0; tile_x < tiles_per_screen_x; ++ tile_x )
+				for ( s32 tile_x = 0; tile_x < world->tiles_per_screen_x; ++ tile_x )
 				{
-					u32 abs_tile_x = screen_x * tiles_per_screen_x + tile_x;
+					s32 abs_tile_x = screen_x * world->tiles_per_screen_x + tile_x;
-					u32 abs_tile_y = screen_y * tiles_per_screen_y + tile_y;
+					s32 abs_tile_y = screen_y * world->tiles_per_screen_y + tile_y;
 
-					u32 tile_value = 1;
+					s32 tile_value = 1;
 
-					bool in_middle_x = tile_x == (tiles_per_screen_x / 2);
+					bool in_middle_x = tile_x == (world->tiles_per_screen_x / 2);
-					bool in_middle_y = tile_y == (tiles_per_screen_y / 2);
+					bool in_middle_y = tile_y == (world->tiles_per_screen_y / 2);
 
-					bool on_right = tile_x == (tiles_per_screen_x - 1);
+					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 == (tiles_per_screen_y - 1);
+					bool on_top    = tile_y == (world->tiles_per_screen_y - 1);
 
 					if ( on_left && (! in_middle_y || ! door_left ))
 					{
@@ -615,19 +615,19 @@ void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI*
 
 	// Personally made assets
 	{
-		StrPath path_test_bg;
+		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;
+		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;
+		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;
+		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 );
 	}
@@ -638,19 +638,69 @@ void startup( OffscreenBuffer* back_buffer, Memory* memory, platform::ModuleAPI*
 		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 );
 
-		StrPath path_hero_front_head;
+	#define path_test "offical\\test\\"
-		path_hero_front_head.concat( platform_api->path_content, str_ascii("offical/test/test_hero_front_head.bmp"));
+		constexpr char const subpath_hero_front_head[] = path_test "test_hero_front_head.bmp";
-		game_state->hero_front_head = load_bmp( platform_api, path_hero_front_head );
+		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";
 
-		StrPath path_hero_front_cape;
+		constexpr char const subpath_hero_front_cape[] = path_test "test_hero_front_cape.bmp";
-		path_hero_front_cape.concat( platform_api->path_content, str_ascii("offical/test/test_hero_front_cape.bmp"));
+		constexpr char const subpath_hero_back_cape [] = path_test "test_hero_back_cape.bmp";
-		game_state->hero_front_cape = load_bmp( platform_api, path_hero_front_cape );
+		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";
 
-		StrPath path_hero_front_torso;
+		constexpr char const subpath_hero_front_torso[] = path_test "test_hero_front_torso.bmp";
-		path_hero_front_torso.concat( platform_api->path_content, str_ascii("offical/test/test_hero_front_torso.bmp"));
+		constexpr char const subpath_hero_back_torso [] = path_test "test_hero_back_torso.bmp";
-		game_state->hero_front_torso = load_bmp( platform_api, path_hero_front_torso );
+		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;
@@ -822,6 +872,12 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 	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;
@@ -848,8 +904,8 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 		b32 valid_new_pos = true;
 		{
 			TileMapPosition test_pos = {
-				new_player_pos_x, new_player_pos_y,
+			                           new_player_pos_x, new_player_pos_y,
-				player->position.tile_x, player->position.tile_y, player->position.tile_z
+									   player->position.tile_x, player->position.tile_y, player->position.tile_z
 			};
 			test_pos = recannonicalize_position( tile_map, test_pos );
 
@@ -886,10 +942,9 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 
 		if ( valid_new_pos )
 		{
-
 			TileMapPosition new_pos = {
-				new_player_pos_x, new_player_pos_y,
+			                          new_player_pos_x, new_player_pos_y,
-				player->position.tile_x, player->position.tile_y, player->position.tile_z
+									  player->position.tile_x, player->position.tile_y, player->position.tile_z
 			};
 			new_pos = recannonicalize_position( tile_map, new_pos );
 
@@ -909,6 +964,23 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 			}
 
 			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 )
@@ -926,25 +998,46 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 			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
 	);
 
-	draw_bitmap( back_buffer
+// Screen Camera
-		, scast(f32, back_buffer->width) / 2.5f, scast(f32, back_buffer->height) / 2.5f
-		, & game_state->hero_front_head
-	);
-
-// Scrolling
 	f32 screen_center_x = 0.5f * scast(f32, back_buffer->width);
 	f32 screen_center_y = 0.5f * scast(f32, back_buffer->height);
 
@@ -952,13 +1045,14 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 	{
 		for ( s32 relative_col = -20; relative_col < +20; ++ relative_col )
 		{
-			u32 col = player->position.tile_x + relative_col;
+			s32 col = game_state->camera_pos.tile_x + relative_col;
-			u32 row = player->position.tile_y + relative_row;
+			s32 row = game_state->camera_pos.tile_y + relative_row;
 
-			u32 tile_id  = TileMap_get_tile_value( tile_map, col, row, player->position.tile_z );
+			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 )
 				{
@@ -986,8 +1080,8 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 					color[2] = 0.3f;
 				}
 
-				f32 center_x = screen_center_x + scast(f32, relative_col) * tile_size_in_pixels - player->position.x * world->tile_meters_to_pixels;
+				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 + player->position.y * 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;
@@ -1024,21 +1118,39 @@ void update_and_render( f32 delta_time, InputState* input, OffscreenBuffer* back
 	f32 player_green = 0.7f;
 	f32 player_blue  = 0.3f;
 
-	f32 player_tile_x_offset = screen_center_x + scast(f32, player->position.tile_x) * world->tile_meters_to_pixels + player->position.x * world->tile_meters_to_pixels;
+	TileMapPosition player_to_camera = subtract( player->position, game_state->camera_pos );
-	f32 player_tile_y_offset = screen_center_y - scast(f32, player->position.tile_y) * world->tile_meters_to_pixels + player->position.y * world->tile_meters_to_pixels;
 
-	f32 player_screen_pos_x = screen_center_x;
+	f32 offcenter_amount_x  = player_to_camera.x + scast(f32, player_to_camera.tile_x) * world->tile_map->tile_size_in_meters;
-	f32 player_screen_pos_y = screen_center_y;
+	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_screen_pos_x, player_screen_pos_y
+	            , player_ground_pos_x, player_ground_pos_y - scast(f32, hero_bitmaps->align_y)
-	            , & game_state->mojito_head );
+	            , & 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_rectangle( back_buffer
+	draw_bitmap( back_buffer
-		, player_screen_pos_x - player_half_width * world->tile_meters_to_pixels, player_screen_pos_y - player->height * world->tile_meters_to_pixels
+	            , player_ground_pos_x, player_ground_pos_y - 45.f
-		, player_screen_pos_x + player_half_width * world->tile_meters_to_pixels, player_screen_pos_y
+	            , & game_state->mojito_head );
-		, player_red, player_green, player_blue );
+#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

project/engine/engine.hpp

@@ -178,6 +178,9 @@ struct World
 	f32 tile_meters_to_pixels;
 	s32 tile_size_in_pixels;
 	
+	s32 tiles_per_screen_x;
+	s32 tiles_per_screen_y;
+
 	TileMap* tile_map;
 };
 

project/engine/tile_map.cpp

@@ -4,9 +4,24 @@
 
 NS_ENGINE_BEGIN
 
+inline
+TileMapPosition subtract( TileMapPosition pos_a, TileMapPosition pos_b )
+{
+	TileMapPosition result {
+		pos_a.x - pos_b.x,
+		pos_a.y - pos_b.y,
+		pos_a.tile_x - pos_b.tile_x,
+		pos_a.tile_y - pos_b.tile_y,
+		
+		// TODO(Ed) : Think about how to handle z...
+		pos_a.tile_z - pos_b.tile_z
+	};
+	return result;
+}
+
 // TODO(Ed) : Consider moving (Casey wants to)
 inline
-void cannonicalize_coord( TileMap* tile_map, u32* tile_coord, f32* pos_coord )
+void cannonicalize_coord( TileMap* tile_map, s32* tile_coord, f32* pos_coord )
 {
 	assert( tile_map != nullptr );
 	assert( tile_coord != nullptr );
@@ -15,7 +30,7 @@ void cannonicalize_coord( TileMap* tile_map, u32* tile_coord, f32* pos_coord )
 
 	// Note(Ed) : World is assumed to be a "torodial topology"
 	s32 offset         = round( (* pos_coord) / tile_size );
-	u32 new_tile_coord = (* tile_coord) + offset;
+	s32 new_tile_coord = (* tile_coord) + offset;
 	f32 new_pos_coord  = (* pos_coord)  - scast(f32, offset) * tile_size;
 
 	assert( new_pos_coord >= -tile_size * 0.5f );
@@ -38,9 +53,9 @@ TileMapPosition recannonicalize_position( TileMap* tile_map, TileMapPosition pos
 }
                                                                     
 inline
-u32 TileChunk_get_tile_value( TileChunk* tile_chunk, TileMap* tile_map, u32 x, u32 y )
+u32 TileChunk_get_tile_value( TileChunk* tile_chunk, TileMap* tile_map, s32 x, s32 y )
 {
-	assert( tile_map      != nullptr );
+	assert( tile_map   != nullptr );
 	assert( tile_chunk != nullptr );
 	assert( x < tile_map->chunk_dimension );
 	assert( y < tile_map->chunk_dimension );
@@ -50,7 +65,7 @@ u32 TileChunk_get_tile_value( TileChunk* tile_chunk, TileMap* tile_map, u32 x, u
 }
 
 inline
-void TileChunk_set_tile_value( TileChunk* tile_chunk, TileMap* tile_map, u32 x, u32 y, u32 value)
+void TileChunk_set_tile_value( TileChunk* tile_chunk, TileMap* tile_map, s32 x, s32 y, s32 value)
 {
 	assert( tile_map   != nullptr );
 	assert( tile_chunk != nullptr );
@@ -130,7 +145,7 @@ b32 TileMap_is_point_empty( TileMap* tile_map, TileMapPosition position )
 }
 
 internal
-void TileMap_set_tile_value( MemoryArena* arena, TileMap* tile_map, u32 abs_tile_x, u32 abs_tile_y, u32 abs_tile_z, u32 value )
+void TileMap_set_tile_value( MemoryArena* arena, TileMap* tile_map, s32 abs_tile_x, s32 abs_tile_y, s32 abs_tile_z, s32 value )
 {
 	TileChunkPosition chunk_pos = get_tile_chunk_position_for( tile_map, abs_tile_x, abs_tile_y, abs_tile_z );
 	TileChunk*        chunk     = TileMap_get_chunk( tile_map, chunk_pos.tile_chunk_x, chunk_pos.tile_chunk_y, chunk_pos.tile_chunk_z );
@@ -140,7 +155,7 @@ void TileMap_set_tile_value( MemoryArena* arena, TileMap* tile_map, u32 abs_tile
 	if ( chunk->tiles == nullptr )
 	{
 		ssize num_tiles = tile_map->chunk_dimension * tile_map->chunk_dimension;
-		chunk->tiles = arena->push_array( u32, num_tiles );
+		chunk->tiles = arena->push_array( s32, num_tiles );
 				
 		for ( ssize tile_index = 0; tile_index < num_tiles; ++ tile_index )
 		{

project/engine/tile_map.hpp

@@ -11,9 +11,11 @@
 
 NS_ENGINE_BEGIN
 
+// TODO(Ed) : I switch the tile coordinates to signed values, I'm clamping rn to force positive
+
 struct TileChunk
 {
-	u32* tiles;
+	s32* tiles;
 };
 
 /*
@@ -21,14 +23,14 @@ struct TileChunk
 */
 struct TileChunkPosition
 {
-	u32 tile_chunk_x;
+	s32 tile_chunk_x;
-	u32 tile_chunk_y;
+	s32 tile_chunk_y;
-	u32 tile_chunk_z;
+	s32 tile_chunk_z;
 
 	// "Chunk-relative (x, y)
 
-	u32 tile_x;
+	s32 tile_x;
-	u32 tile_y;
+	s32 tile_y;
 };
 
 struct TileMap
@@ -41,9 +43,9 @@ struct TileMap
 	f32 tile_size_in_meters;
 
 	// TODO(Ed) : Real sparseness ? (not use the giant pointer array)
-	u32 chunk_shift;
+	s32 chunk_shift;
-	u32 chunk_mask;
+	s32 chunk_mask;
-	u32 chunk_dimension;
+	s32 chunk_dimension;
 
 	TileChunk* chunks;
 };
@@ -58,9 +60,9 @@ struct TileMapPosition
 	// Fixed point tile locations.
 	// High bits are the tile-chunk index, and the low bits are the tile index in the chunk.
 
-	u32 tile_x;
+	s32 tile_x;
-	u32 tile_y;
+	s32 tile_y;
-	u32 tile_z;
+	s32 tile_z;
 };
 
 NS_ENGINE_END

project/handmade.hpp

@@ -91,6 +91,26 @@ struct PlayerActions
 	b32 jump;
 };
 
+enum EHeroBitmapsDirection : u32
+{
+	HeroBitmaps_Front,
+	HeroBitmaps_Back,
+	HeroBitmaps_Left,
+	HeroBitmaps_Right
+};
+
+struct HeroBitmaps
+{
+	using Bitmap = engine::Bitmap;
+
+	s32 align_x;
+	s32 align_y;
+
+	Bitmap head;
+	Bitmap cape;
+	Bitmap torso;
+};
+
 struct GameState
 {
 	PlayerState player_state;
@@ -103,9 +123,11 @@ struct GameState
 	Bitmap mojito_head;
 
 	Bitmap test_bg_hh;
-	Bitmap hero_front_head;
+	
-	Bitmap hero_front_cape;
+	engine::TileMapPosition camera_pos;
-	Bitmap hero_front_torso;
+
+	EHeroBitmapsDirection hero_direction;
+	HeroBitmaps hero_bitmaps[4];
 };
 
 NS_HANDMADE_END