1 files changed, 99 insertions, 0 deletions
diff --git a/src/game/collision.cpp b/src/game/collision.cpp
new file mode 100644
index 00000000..c1e08441
--- /dev/null
+++ b/src/game/collision.cpp
@@ -0,0 +1,99 @@
+/* copyright (c) 2007 magnus auvinen, see licence.txt for more info */
+#include <base/system.h>
+#include <base/math.hpp>
+#include <base/vmath.hpp>
+
+#include <math.h>
+#include <engine/e_common_interface.h>
+#include <game/mapitems.hpp>
+#include <game/layers.hpp>
+
+static TILE *tiles;
+static int width = 0;
+static int height = 0;
+
+int col_width() { return width; }
+int col_height() { return height; }
+
+int col_init()
+{
+	width = layers_game_layer()->width;
+	height = layers_game_layer()->height;
+	tiles = (TILE *)map_get_data(layers_game_layer()->data);
+	return 1;
+}
+
+
+int col_is_solid(int x, int y)
+{
+	int nx = x/32;
+	int ny = y/32;
+	if(nx < 0 || nx >= width || ny >= height)
+		return 1;
+	
+	if(y < 0)
+		return 0; // up == sky == free
+	
+	return tiles[ny*width+nx].index == TILE_SOLID;
+}
+
+// TODO: rewrite this smarter!
+bool col_intersect_line(vec2 pos0, vec2 pos1, vec2 *out)
+{
+	float d = distance(pos0, pos1);
+	
+	for(float f = 0; f < d; f++)
+	{
+		float a = f/d;
+		vec2 pos = mix(pos0, pos1, a);
+		if(col_is_solid((int)pos.x, (int)pos.y))
+		{
+			if(out)
+				*out = pos;
+			return true;
+		}
+	}
+	if(out)
+		*out = pos1;
+	return false;
+}
+
+/*
+	Simple collision rutines!
+*/
+/*
+struct collision
+{
+	int w, h;
+	unsigned char *data;
+};
+
+static collision col;
+static int global_dividor;
+
+int col_width()
+{
+	return col.w;
+}
+
+int col_height()
+{
+	return col.h;	
+}
+
+int col_init(int dividor)
+{
+	mapres_collision *c = (mapres_collision*)map_find_item(MAPRES_COLLISIONMAP,0);
+	if(!c)
+	{
+		dbg_msg("mapres_col", "failed!");
+		return 0;
+	}
+	col.w = c->width;
+	col.h = c->height;
+	global_dividor = dividor;
+	col.data = (unsigned char *)map_get_data(c->data_index);
+	return col.data ? 1 : 0;
+}
+
+*/