From 91aef268319a77ee8f5a082ca89264bf2671e212 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sat, 6 May 2023 10:39:19 +1000
Subject: Map rendering and camera movement.

---
 Makefile             |   1 +
 asset.c              |   3 +-
 asset.h              |   3 +-
 game.c               |  12 +++++-
 game_config.h        |   6 +++
 intermediate/map.bmp | Bin 0 -> 8330 bytes
 map.c                |  95 ++++++++++++++++++++++++++++++++++++++++
 map.h                |  19 ++++++++
 player.c             |  22 +++++++++-
 render.c             | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++
 render.h             |  17 ++++++++
 sprite.c             |  10 +++++
 sprite.h             |   4 +-
 sprite_system.c      |   7 ++-
 world.h              |   4 ++
 15 files changed, 314 insertions(+), 8 deletions(-)
 create mode 100644 intermediate/map.bmp
 create mode 100644 map.c
 create mode 100644 map.h

diff --git a/Makefile b/Makefile
index f4d21cf..c4c00e2 100644
--- a/Makefile
+++ b/Makefile
@@ -95,6 +95,7 @@ sources = \
   game.c \
   main.c \
   malware.c \
+  map.c \
   menu.c \
   platform.c \
   player.c \
diff --git a/asset.c b/asset.c
index 5db8a20..162bcbb 100644
--- a/asset.c
+++ b/asset.c
@@ -9,7 +9,8 @@ static const char* const asset_vpaths[] = {
 	/* asset_id_usr    */ "data/usr.img",
 	/* asset_id_char   */ "data/char.img",
 	/* asset_id_bullet */ "data/bullet.img",
-	/* asset_id_enemy  */ "data/enemy.img"
+	/* asset_id_enemy  */ "data/enemy.img",
+	/* asset_id_map    */ "data/map.img"
 };
 
 static struct {
diff --git a/asset.h b/asset.h
index 23b0893..2650f61 100644
--- a/asset.h
+++ b/asset.h
@@ -3,13 +3,14 @@
 
 #include "render.h"
 
-#define bitmap_asset_count 4
+#define bitmap_asset_count 5
 
 typedef enum {
 	asset_id_usr = 0,
 	asset_id_char,
 	asset_id_bullet,
 	asset_id_enemy,
+	asset_id_map,
 	asset_count
 } Asset_ID;
 
diff --git a/game.c b/game.c
index 73d062b..00e4265 100644
--- a/game.c
+++ b/game.c
@@ -87,18 +87,22 @@ static void menu_deinit(Game* game) {
 
 static void gameplay_init(Game* game) {
 	init_world(&game->world);
-
+	init_map(&game->world.map);
 	init_player(&game->world.player, &game->world);
-
 	new_skull(&game->world, 0, 0);
 }
 
 static void gameplay_update(Game* game) {
+	int cx, cy;
+	cx = game->world.cam_x;
+	cy = game->world.cam_y;
+
 	update_player(&game->world.player, &game->world);
 	enemy_system(&game->world);
 	bullet_system(&game->world);
 	collision_system(&game->world);
 	animation_system(&game->world);
+	render_map(&game->world.map, cx, cy);
 	sprite_system(&game->world);
 }
 
@@ -127,11 +131,15 @@ static void dead_init(Game* game) {
 
 static void dead_update(Game* game) {
 	const BM_Font* font;
+	int cx, cy;
 
 	font = get_default_font();
 
 	update_menu(&game->menu);
 
+	cx = game->world.cam_x;
+	cy = game->world.cam_y;
+	render_map(&game->world.map, cx, cy);
 	sprite_system(&game->world);
 
 	rfont_text(
diff --git a/game_config.h b/game_config.h
index b2d569f..8609814 100644
--- a/game_config.h
+++ b/game_config.h
@@ -11,4 +11,10 @@
 #define skull_shoot_cooldown 15
 #define enemy_bullet_speed 10
 
+#define map_width 32
+#define map_height 32
+#define map_tile_size 16
+#define mbmp_w (map_width  * map_tile_size)
+#define mbmp_h (map_height * map_tile_size)
+
 #endif
diff --git a/intermediate/map.bmp b/intermediate/map.bmp
new file mode 100644
index 0000000..e6a66ee
Binary files /dev/null and b/intermediate/map.bmp differ
diff --git a/map.c b/map.c
new file mode 100644
index 0000000..2b10abd
--- /dev/null
+++ b/map.c
@@ -0,0 +1,95 @@
+#include "map.h"
+#include "sprite.h"
+#include "standard.h"
+
+void init_map(Map* map) {
+	const Sprite* floor, * bricks;
+	const Bitmap* fbmp, * bbmp;
+	Bitmap bitmap;
+	int i, x, y;
+
+	bitmap.pixels = map->pixels;
+	bitmap.w = mbmp_w;
+	bitmap.h = mbmp_h;
+
+	floor  = get_sprite(sprite_floor_tile);
+	bricks = get_sprite(sprite_bricks);
+	fbmp = get_bitmap(floor->bitmap);
+	bbmp = get_bitmap(bricks->bitmap);
+
+	for (i = 0; i < mbmp_w * mbmp_h; i++) {
+		bitmap.pixels[i] = make_black();
+	}
+
+	for (x = 1; x < map_width - 1; x++) {
+		for (y = 1; y < map_height - 1; y++) {
+			blit(
+				&bitmap,
+				fbmp,
+				map_tile_size * x,
+				map_tile_size * y,
+				&floor->rect
+			);
+		}
+	}
+
+	for (x = 0; x < map_width; x++) {
+		blit(
+			&bitmap,
+			bbmp,
+			map_tile_size * x,
+			0,
+			&bricks->rect
+		);
+		blit(
+			&bitmap,
+			bbmp,
+			map_tile_size * x,
+			(map_height - 1) * map_tile_size,
+			&bricks->rect
+		);
+	}
+
+	for (y = 0; y < map_height; y++) {
+		blit(
+			&bitmap,
+			bbmp,
+			0,
+			map_tile_size * y,
+			&bricks->rect
+		);
+		blit(
+			&bitmap,
+			bbmp,
+			(map_width - 1) * map_tile_size,
+			map_tile_size * y,
+			&bricks->rect
+		);
+	}
+
+	for (i = 0; i < 20; i++) {
+		x = rand_range(0, map_width - 1) * map_tile_size;
+		y = rand_range(0, map_height - 1) * map_tile_size;
+		blit(
+			&bitmap,
+			bbmp,
+			x,
+			y,
+			&bricks->rect
+		);
+	}
+}
+
+void render_map(Map* map, int cx, int cy) {
+	Bitmap bitmap;
+	Rectangle rect;
+
+	bitmap.pixels = map->pixels;
+	bitmap.w = mbmp_w;
+	bitmap.h = mbmp_h;
+	rect.x = 0;
+	rect.y = 0;
+	rect.w = bitmap.w;
+	rect.h = bitmap.h;
+	render_bitmap(&bitmap, -cx >> fbits, -cy >> fbits, &rect);
+}
diff --git a/map.h b/map.h
new file mode 100644
index 0000000..35e97f2
--- /dev/null
+++ b/map.h
@@ -0,0 +1,19 @@
+#ifndef map_h
+#define map_h
+
+#include "game_config.h"
+#include "render.h"
+
+typedef struct {
+	Colour pixels[
+		map_width *
+		map_tile_size *
+		map_height *
+		map_tile_size
+	];
+} Map;
+
+void init_map(Map* map);
+void render_map(Map* map, int cx, int cy);
+
+#endif
diff --git a/player.c b/player.c
index 592ef4a..d79beed 100644
--- a/player.c
+++ b/player.c
@@ -55,7 +55,7 @@ void init_player(Player* player, World* world) {
 }
 
 void update_player(Player* player, World* world) {
-	int dx, dy;
+	int dx, dy, cbx, cby;
 	int face, moving = 0;
 	Entity e;
 	CPosition* pos;
@@ -132,6 +132,26 @@ void update_player(Player* player, World* world) {
 		game_change_state(&game, game_state_dead);
 	}
 
+	world->cam_x = pos->x - ((renderer_w / 2) << fbits);
+	world->cam_y = pos->y - ((renderer_h / 2) << fbits);
+
+	if (world->cam_x < 0) {
+		world->cam_x = 0;
+	}
+
+	if (world->cam_y < 0) {
+		world->cam_y = 0;
+	}
+
+	cbx = (mbmp_w - renderer_w) << fbits;
+	if (world->cam_x > cbx) {
+		world->cam_x = cbx;
+	}
+	cby = (mbmp_h - renderer_h) << fbits;
+	if (world->cam_y > cby) {
+		world->cam_y = cby;
+	}
+
 	player->shoot_countdown--;
 }
 
diff --git a/render.c b/render.c
index b2a59e2..c18d74d 100644
--- a/render.c
+++ b/render.c
@@ -261,3 +261,122 @@ void render_bitmap_col(
 		src += sstride;
 	}
 }
+
+void blit(
+	Bitmap* to,
+	const Bitmap* from,
+	int x,
+	int y,
+	const Rectangle* rect
+) {
+	int i, j, stride, sstride, n;
+	Colour* dst;
+	const Colour* src;
+	Rectangle sub;
+
+	sub = *rect;
+
+	if (sub.w <= 0) { return; }
+	if (sub.h <= 0) { return; }
+	if (sub.w > from->w) { return; }
+	if (sub.h > from->h) { return; }
+
+	if ((n = -x) > 0) {
+		sub.w -= n;
+		sub.x += n;
+		x += n;
+	}
+	
+	if ((n = -y) > 0) {
+		sub.h -= n;
+		sub.y += n;
+		y += n;
+	}
+	
+	if ((n = x + sub.w - to->w) > 0) {
+		sub.w -= n;
+	}
+
+	if ((n = y + sub.h - to->h) > 0) {
+		sub.h -= n;
+	}
+
+	if (sub.w <= 0) { return; }
+	if (sub.h <= 0) { return; }
+
+	dst = to->pixels   + (x     + y     * to->w);
+	src = from->pixels + (sub.x + sub.y * from->w);
+
+	stride = to->w - sub.w;
+	sstride = from->w - sub.w;
+
+	for (i = 0; i < sub.h; i++) {
+		for (j = 0; j < sub.w; j++) {
+			*dst = blend(*dst, *src);
+			dst++;
+			src++;
+		}
+		dst += stride;
+		src += sstride;
+	}
+}
+
+void blit_col(
+	Bitmap* to,
+	const Bitmap* from,
+	int x,
+	int y,
+	const Rectangle* rect,
+	Colour colour
+) {
+	int i, j, stride, sstride, n;
+	Colour* dst;
+	const Colour* src;
+	Rectangle sub;
+
+	sub = *rect;
+
+	if (sub.w <= 0) { return; }
+	if (sub.h <= 0) { return; }
+	if (sub.w > from->w) { return; }
+	if (sub.h > from->h) { return; }
+
+	if ((n = -x) > 0) {
+		sub.w -= n;
+		sub.x += n;
+		x += n;
+	}
+	
+	if ((n = -y) > 0) {
+		sub.h -= n;
+		sub.y += n;
+		y += n;
+	}
+	
+	if ((n = x + sub.w - to->w) > 0) {
+		sub.w -= n;
+	}
+
+	if ((n = y + sub.h - to->h) > 0) {
+		sub.h -= n;
+	}
+
+	if (sub.w <= 0) { return; }
+	if (sub.h <= 0) { return; }
+
+	dst = to->pixels   + (x     + y     * to->w);
+	src = from->pixels + (sub.x + sub.y * from->w);
+
+	stride = to->w - sub.w;
+	sstride = from->w - sub.w;
+
+	for (i = 0; i < sub.h; i++) {
+		for (j = 0; j < sub.w; j++) {
+			*dst = blend_mod(*dst, *src, colour);
+			dst++;
+			src++;
+		}
+		dst += stride;
+		src += sstride;
+	}
+}
diff --git a/render.h b/render.h
index be03f02..fc6fed1 100644
--- a/render.h
+++ b/render.h
@@ -84,4 +84,21 @@ void render_bitmap_col(
 	Colour colour
 );
 
+void blit(
+	Bitmap* dst,
+	const Bitmap* src,
+	int x,
+	int y,
+	const Rectangle* rect
+);
+
+void blit_col(
+	Bitmap* dst,
+	const Bitmap* src,
+	int x,
+	int y,
+	const Rectangle* rect,
+	Colour colour
+);
+
 #endif
diff --git a/sprite.c b/sprite.c
index ca72f44..708c5e9 100644
--- a/sprite.c
+++ b/sprite.c
@@ -70,6 +70,16 @@ static const Sprite sprites[] = {
 	{
 		asset_id_usr,
 		{ 0, 80, 171, 10 }
+	},
+	/* sprite_floor_tile */
+	{
+		asset_id_map,
+		{ 0, 0, 16, 16 }
+	},
+	/* sprite_bricks */
+	{
+		asset_id_map,
+		{ 16, 0, 16, 16 }
 	}
 };
 
diff --git a/sprite.h b/sprite.h
index cdc5e28..9f09747 100644
--- a/sprite.h
+++ b/sprite.h
@@ -19,7 +19,9 @@ typedef enum {
 	sprite_skull_debris_5,
 	sprite_enemy_bullet,
 	sprite_author,
-	sprite_free
+	sprite_free,
+	sprite_floor_tile,
+	sprite_bricks
 } Sprite_ID;
 
 typedef struct {
diff --git a/sprite_system.c b/sprite_system.c
index 526c097..b94886e 100644
--- a/sprite_system.c
+++ b/sprite_system.c
@@ -5,7 +5,7 @@
 #include "world.h"
 
 void sprite_system(const World* world) {
-	int i;
+	int i, x, y;
 	unsigned bits;
 	const CSprite* sprite;
 	const CPosition* pos;
@@ -17,8 +17,11 @@ void sprite_system(const World* world) {
 			pos = &world->positions[i];
 			sprite = &world->sprites[i];
 
+			x = pos->x - world->cam_x;
+			y = pos->y - world->cam_y;
+
 			b = get_bitmap(sprite->id);
-			render_bitmap(b, pos->x >> fbits, pos->y >> fbits, &sprite->rect);
+			render_bitmap(b, x >> fbits, y >> fbits, &sprite->rect);
 		}
 	}
 }
diff --git a/world.h b/world.h
index 923dc90..ee2dc1a 100644
--- a/world.h
+++ b/world.h
@@ -3,6 +3,7 @@
 
 #include "components.h"
 #include "config.h"
+#include "map.h"
 #include "player.h"
 
 typedef int Entity;
@@ -23,7 +24,10 @@ struct World {
 	CEnemy         enemies       [max_entities];
 	CCollider      colliders     [max_entities];
 
+	int cam_x, cam_y;
+
 	Player player;
+	Map map;
 };
 
 void init_world(World* world);
-- 
cgit v1.2.3-54-g00ecf