X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=blobdiff_plain;f=src%2Fgame_mm%2Fmm_game.c;h=b258e374b7f0bbeb868be9b873e831e331394af0;hp=bc72f5bd43c2169505ae7eaae1a1827c3437856e;hb=HEAD;hpb=b086cf74ed94a4e3e57f42242e0f066e01ea751c

diff --git a/src/game_mm/mm_game.c b/src/game_mm/mm_game.c
index bc72f5bd..b258e374 100644
--- a/src/game_mm/mm_game.c
+++ b/src/game_mm/mm_game.c
@@ -981,6 +981,11 @@ static int getMaskFromElement(int element)
     return MM_MASK_CIRCLE;
 }
 
+static int getPixelFromMask(int pos, int dx, int dy)
+{
+  return (mm_masks[pos][dy / 2][dx / 2] == 'X' ? 1 : 0);
+}
+
 static int getLevelFromLaserX(int x)
 {
   return x / TILEX - (x < 0 ? 1 : 0);		// correct negative values
@@ -1064,7 +1069,7 @@ static int ScanPixel(void)
 	{
 	  int pos = getMaskFromElement(element);
 
-	  pixel = (mm_masks[pos][dy / 2][dx / 2] == 'X' ? 1 : 0);
+	  pixel = getPixelFromMask(pos, dx, dy);
 	}
       }
       else
@@ -1687,6 +1692,9 @@ static boolean HitElement(int element, int hit_mask)
     // check if laser scan has crossed element boundaries (not just mini tiles)
     boolean cross_x = (getLevelFromLaserX(LX) != getLevelFromLaserX(LX + 2));
     boolean cross_y = (getLevelFromLaserY(LY) != getLevelFromLaserY(LY + 2));
+    int element_angle = get_element_angle(element);
+    int mirrored_angle = get_mirrored_angle(laser.current_angle, element_angle);
+    int opposite_angle = get_opposite_angle(laser.current_angle);
 
     // check if wall (horizontal or vertical) side of slope was hit
     if (hit_mask == HIT_MASK_LEFT ||
@@ -1694,7 +1702,26 @@ static boolean HitElement(int element, int hit_mask)
 	hit_mask == HIT_MASK_TOP ||
 	hit_mask == HIT_MASK_BOTTOM)
     {
-      return HitReflectingWalls(element, hit_mask);
+      boolean hit_slope_corner_in_laser_direction =
+	((hit_mask == HIT_MASK_LEFT   && (element == EL_DF_SLOPE_01 ||
+					  element == EL_DF_SLOPE_02)) ||
+	 (hit_mask == HIT_MASK_RIGHT  && (element == EL_DF_SLOPE_00 ||
+					  element == EL_DF_SLOPE_03)) ||
+	 (hit_mask == HIT_MASK_TOP    && (element == EL_DF_SLOPE_02 ||
+					  element == EL_DF_SLOPE_03)) ||
+	 (hit_mask == HIT_MASK_BOTTOM && (element == EL_DF_SLOPE_00 ||
+					  element == EL_DF_SLOPE_01)));
+
+      boolean hit_slope_corner_in_laser_direction_double_checked =
+	(cross_x && cross_y &&
+	 laser.current_angle == mirrored_angle &&
+	 hit_slope_corner_in_laser_direction);
+
+      // check special case of laser hitting the corner of a slope and another
+      // element (either wall or another slope), following the diagonal side
+      // of the slope which has the same angle as the direction of the laser
+      if (!hit_slope_corner_in_laser_direction_double_checked)
+	return HitReflectingWalls(element, hit_mask);
     }
 
     // check if an edge was hit while crossing element borders
@@ -1708,8 +1735,8 @@ static boolean HitElement(int element, int hit_mask)
       int pos = getMaskFromElement(element);
 
       // check if we are entering empty space area after hitting edge
-      if (mm_masks[pos][dy1 / 2][dx1 / 2] != 'X' &&
-	  mm_masks[pos][dy2 / 2][dx2 / 2] != 'X')
+      if (!getPixelFromMask(pos, dx1, dy1) &&
+	  !getPixelFromMask(pos, dx2, dy2))
       {
 	// we already know that we hit an edge, but use this function to go on
 	if (HitOnlyAnEdge(hit_mask))
@@ -1717,10 +1744,6 @@ static boolean HitElement(int element, int hit_mask)
       }
     }
 
-    int mirrored_angle = get_mirrored_angle(laser.current_angle,
-					    get_element_angle(element));
-    int opposite_angle = get_opposite_angle(laser.current_angle);
-
     // check if laser is reflected by slope by 180°
     if (mirrored_angle == opposite_angle)
     {
@@ -1951,8 +1974,8 @@ static boolean HitElement(int element, int hit_mask)
       {
 	int elx, ely;
 
-	elx = getLevelFromLaserX(LX);
-	ely = getLevelFromLaserY(LY);
+	elx = getLevelFromLaserX(LX + XS);
+	ely = getLevelFromLaserY(LY + YS);
 
 	if (IN_LEV_FIELD(elx, ely))
 	{
@@ -1965,8 +1988,8 @@ static boolean HitElement(int element, int hit_mask)
 
 	int nr = element - EL_DF_SLOPE_START;
 	int dx = (nr == 0 ? (XS > 0 ? TILEX - 1 : -1) :
-		  nr == 1 ? (XS > 0 ? TILEX     :  1) :
-		  nr == 2 ? (XS > 0 ? TILEX     :  1) :
+		  nr == 1 ? (XS > 0 ? TILEX     :  0) :
+		  nr == 2 ? (XS > 0 ? TILEX     :  0) :
 		  nr == 3 ? (XS > 0 ? TILEX - 1 : -1) : 0);
 	int dy = (nr == 0 ? (YS > 0 ? TILEY - 1 : -1) :
 		  nr == 1 ? (YS > 0 ? TILEY - 1 : -1) :
@@ -1998,7 +2021,7 @@ static boolean HitElement(int element, int hit_mask)
 	  {
 	    int pos = getMaskFromElement(element_side);
 
-	    if (mm_masks[pos][dy / 2][dx / 2] == 'X')
+	    if (getPixelFromMask(pos, dx, dy))
 	      laser.overloaded = TRUE;
 	  }
 	}