player entity

1 files changed, 61 insertions, 4 deletions

diff --git a/src/tilemap.c b/src/tilemap.c
index af2c163..7dbc4dd 100644
--- a/src/tilemap.c
+++ b/src/tilemap.c
@@ -33,6 +33,56 @@ struct PACKED map {
 	uint8_t tiles[];
 };
 
+collision_T tilemap_tile_raw(struct tilemap *tilemap, int x, int y) {
+	return tilemap->collision[x + y * tilemap->width];
+}
+
+collision_T tilemap_tile(struct tilemap *tilemap, int x, int y) {
+	x /= 8;
+	y /= 8;
+	if (x < 0) {
+		x = 0;
+	} else if ((unsigned) x >= tilemap->width) {
+		x = tilemap->width - 1;
+	}
+	if (y < 0) {
+		y = 0;
+	} else if ((unsigned) y >= tilemap->height) {
+		y = tilemap->height - 1;
+	}
+	return tilemap_tile_raw(tilemap, x, y);
+}
+
+collision_T tilemap_area_raw(struct tilemap *tilemap, int x1, int y1, int x2, int y2) {
+	collision_T value = 0;
+	for (int x = x1; x <= x2; x++) {
+		for (int y = y1; y <= y2; y++) {
+			value |= tilemap->collision[x + y * tilemap->width];
+		}
+	}
+	return value;
+}
+
+collision_T tilemap_area(struct tilemap *tilemap, int x1, int y1, int x2, int y2) {
+	x1 /= 8;
+	y1 /= 8;
+	x2 = (x2 - 1) / 8;
+	y2 = (y2 - 1) / 8;
+	if (x1 < 0) {
+		x1 = 0;
+	}
+	if (x2 >= tilemap->width) {
+		x2 = tilemap->width - 1;
+	}
+	if (y1 < 0) {
+		y1 = 0;
+	}
+	if (y2 >= tilemap->height) {
+		y2 = tilemap->height - 1;
+	}
+	return tilemap_area_raw(tilemap, x1, y1, x2, y2);
+}
+
 void tilemap_background(struct tilemap *tilemap, int x, int y, int w, int h) {
 	SDL_SetRenderDrawColor(renderer, tilemap->backdrop.r, tilemap->backdrop.g, tilemap->backdrop.b, tilemap->backdrop.a);
 	SDL_RenderFillRect(renderer, &(SDL_Rect) {0, 0, w, h});
@@ -103,13 +153,20 @@ struct tilemap *tilemap_load(void *data, size_t size) {
 		struct blob col = res_get_collision(str);
 		
 		SDL_RenderCopy(renderer, tex, &(SDL_Rect) {0, 0, 128, height}, &(SDL_Rect) {0, y, 128, height});
-		if (col.size + y * 2 > 0xf0) {
-			fprintf(stderr, "warn: '%s' overflows tile properties\n", str);
-			col.size = 0xf0 - y * 2;
+		if (col.data != NULL) { // silence -fsanitize=undefined
+			if (col.size + y * 2 > 0xf0) {
+				fprintf(stderr, "warn: '%s' overflows tile properties\n", str);
+				col.size = 0xf0 - y * 2;
+			}
+			memcpy(collision + y * 2, col.data, col.size * sizeof (collision_T));
 		}
-		memcpy(collision + y * 2, col.data, col.size * sizeof (collision_T));
 		
 		y += height;
+		if (y + height > 0xf0) {
+			fputs("error: too many tiles\n", stderr);
+			tilemap_free(tilemap);
+			return NULL;
+		}
 		str += len + 1;
 		size -= len + 4 + 1;
 	}