data/DataCache.scr

@@ -87,6 +87,8 @@ levels/CHAPTER04_LEVEL0405.Lvl
 levels/CHAPTER04_LEVEL0406.Lvl
 levels/CHAPTER04_LEVEL0407.Lvl
 
+collision/colltab.dat
+
 actors/spongebob.a3d
 actors/spongebob.tex
 

makefile.gfx

@@ -101,6 +101,28 @@ cleanlevels : 	$(foreach CHAPTER,$(LEVELS_CHAPTERS),$(foreach LEVEL,$(LEVELS_$(C
 				@$(ECHO) Levels cleaned
 
 
+#----------------------------------------------------------------------------
+# Collision data
+#----------------------------------------------------------------------------
+
+COLLISION_IN		:=	$(TOOL_DIR)/mapedit/collision.bmp
+
+COLLISION_OUT_DIR	:=	$(DATA_OUT)/collision
+COLLISION_OUT		:=	$(COLLISION_OUT_DIR)/colltab.dat
+
+collision : $(COLLISION_OUT)
+
+cleancollision:
+	@$(RM) -f $(COLLISION_OUT)
+	@$(ECHO) Collision table cleaned
+
+$(COLLISION_OUT) : $(COLLISION_IN)
+	@$(DATA_BIN_DIR)/mkcoltab $(COLLISION_IN) -o:$(COLLISION_OUT)
+
+GRAF_DIRS_TO_MAKE	+=	$(COLLISION_OUT_DIR)
+GFX_DATA_OUT		+=	$(COLLISION_OUT)
+
+
 #----------------------------------------------------------------------------
 #----------------------------------------------------------------------------
 # Actors

source/level/layercollision.cpp

@@ -8,6 +8,10 @@
 
 #include	"LayerCollision.h"
 
+#ifndef _FILEIO_HEADER_
+#include 	"fileio\fileio.h"
+#endif
+
 
 /*****************************************************************************/
 /*****************************************************************************/
@@ -19,6 +23,8 @@ CLayerCollision::CLayerCollision(sLayerHdr *Hdr)
 		MapWidth=LayerHdr->Width;
 		MapHeight=LayerHdr->Height;
 		printf("COLLISION LAYER = %i %i\n",MapWidth,MapHeight);
+
+		m_collisionTable=CFileIO::loadFile(COLLISION_COLLTAB_DAT);
 }
 
 /*****************************************************************************/
@@ -29,8 +35,60 @@ CLayerCollision::~CLayerCollision()
 /*****************************************************************************/
 void		CLayerCollision::shutdown()
 {
+	MemFree(m_collisionTable);
 }
 
+/*****************************************************************************/
+int			CLayerCollision::getHeightFromGround(int _x,int _y,int _maxHeight)
+{
+	int	mapX,mapY,xFraction,yFraction;
+	int	distanceFromGround;
+	int	colHeight;
+
+	mapX=_x>>4;
+	mapY=(_y>>4)*MapWidth;
+	xFraction=_x&0x0f;
+	yFraction=16-(_y&0x0f);
+	distanceFromGround=0;
+
+	colHeight=m_collisionTable[(Map[mapX+mapY]*16)+xFraction];if(Map[mapX+mapY])colHeight++;
+	if(colHeight)
+	{
+		// Inside a collision block.. find the nearest ground above this point
+		while(colHeight==16)
+		{
+			_y-=16;
+			mapY-=MapWidth;
+			distanceFromGround-=16;
+			if(distanceFromGround<=-_maxHeight)
+			{
+				return -_maxHeight;
+			}
+			colHeight=m_collisionTable[(Map[mapX+mapY]*16)+xFraction];if(Map[mapX+mapY])colHeight++;
+		}
+		distanceFromGround+=yFraction-colHeight;
+	}
+	else
+	{
+		// Not inside a collision block.. find the nearest ground below this point
+		while(colHeight==0)
+		{
+			_y+=16;
+			mapY+=MapWidth;
+			distanceFromGround+=16;
+			if(distanceFromGround>=_maxHeight)
+			{
+				return _maxHeight;
+			}
+			colHeight=m_collisionTable[(Map[mapX+mapY]*16)+xFraction];if(Map[mapX+mapY])colHeight++;
+		}
+		distanceFromGround+=yFraction-colHeight;
+	}
+
+	return distanceFromGround;
+}
+
+
 /*****************************************************************************/
 #ifdef __SHOW_COLLISION__
 #include "gfx\prim.h"

source/level/layercollision.h

@@ -23,6 +23,7 @@ virtual	~CLayerCollision();
 virtual	void			shutdown();
 
 		u8				Get(int X,int Y)	{return(Map[X+(Y*MapWidth)]);}
+		int				getHeightFromGround(int _x,int _y,int _maxHeight=32);
 
 #ifdef __SHOW_COLLISION__
 		void			render(DVECTOR &MapPos);
@@ -35,6 +36,8 @@ protected:
 
 
 		u8				*Map;
+
+		u8				*m_collisionTable;
 };