From: Holger Schemel <info@artsoft.org>
Date: Fri, 23 Mar 2018 22:19:59 +0000 (+0100)
Subject: added centering levels that are smaller than the playfield (MM engine)
X-Git-Tag: 4.1.0.0~11
X-Git-Url: https://git.artsoft.org/?a=commitdiff_plain;h=14801844faf14be284c590b66f030c6bf7cea5c2;p=rocksndiamonds.git

added centering levels that are smaller than the playfield (MM engine)
---

diff --git a/src/game_mm/mm_game.c b/src/game_mm/mm_game.c
index 0a9d2da6..7d22eb30 100644
--- a/src/game_mm/mm_game.c
+++ b/src/game_mm/mm_game.c
@@ -751,15 +751,18 @@ void InitGameActions_MM()
 
 void AddLaserEdge(int lx, int ly)
 {
-  if (lx < -2 || ly < -2 || lx >= SXSIZE + 2 || ly >= SYSIZE + 2)
+  int clx = dSX + lx;
+  int cly = dSY + ly;
+
+  if (clx < -2 || cly < -2 || clx >= SXSIZE + 2 || cly >= SYSIZE + 2)
   {
     Error(ERR_WARN, "AddLaserEdge: out of bounds: %d, %d", lx, ly);
 
     return;
   }
 
-  laser.edge[laser.num_edges].x = SX + 2 + lx;
-  laser.edge[laser.num_edges].y = SY + 2 + ly;
+  laser.edge[laser.num_edges].x = cSX2 + lx;
+  laser.edge[laser.num_edges].y = cSY2 + ly;
   laser.num_edges++;
 
   laser.redraw = TRUE;
@@ -781,8 +784,8 @@ boolean StepBehind()
   {
     int x = LX - XS;
     int y = LY - YS;
-    int last_x = laser.edge[laser.num_edges - 1].x - SX - 2;
-    int last_y = laser.edge[laser.num_edges - 1].y - SY - 2;
+    int last_x = laser.edge[laser.num_edges - 1].x - cSX2;
+    int last_y = laser.edge[laser.num_edges - 1].y - cSY2;
 
     return ((x - last_x) * XS < 0 || (y - last_y) * YS < 0);
   }
@@ -860,8 +863,8 @@ int ScanPixel()
       }
       else
       {
-	pixel = (SX + px < REAL_SX || SX + px >= REAL_SX + FULL_SXSIZE ||
-		 SY + py < REAL_SY || SY + py >= REAL_SY + FULL_SYSIZE);
+	pixel = (cSX + px < REAL_SX || cSX + px >= REAL_SX + FULL_SXSIZE ||
+		 cSY + py < REAL_SY || cSY + py >= REAL_SY + FULL_SYSIZE);
       }
 
       if ((Sign[laser.current_angle] & (1 << i)) && pixel)
@@ -1191,8 +1194,8 @@ void DrawLaserExt(int start_edge, int num_edges, int mode)
   if (start_edge == 0)
     laser.current_angle = laser.start_angle;
 
-  LX = laser.edge[start_edge].x - (SX + 2);
-  LY = laser.edge[start_edge].y - (SY + 2);
+  LX = laser.edge[start_edge].x - cSX2;
+  LY = laser.edge[start_edge].y - cSY2;
   XS = 2 * Step[laser.current_angle].x;
   YS = 2 * Step[laser.current_angle].y;
 
@@ -2329,7 +2332,7 @@ void OpenSurpriseBall(int x, int y)
       getGraphicSource(graphic, 0, &bitmap, &gx, &gy);
 
       BlitBitmap(bitmap, drawto, gx + dx, gy + dy, 6, 6,
-		 SX + x * TILEX + dx, SY + y * TILEY + dy);
+		 cSX + x * TILEX + dx, cSY + y * TILEY + dy);
 
       MarkTileDirty(x, y);
     }
@@ -2540,7 +2543,7 @@ static void Explode_MM(int x, int y, int phase, int mode)
     getGraphicSource(graphic, graphic_phase, &bitmap, &src_x, &src_y);
 
     BlitBitmap(bitmap, drawto_field, src_x, src_y, TILEX, TILEY,
-	       FX + x * TILEX, FY + y * TILEY);
+	       cFX + x * TILEX, cFY + y * TILEY);
 
     MarkTileDirty(x, y);
   }
@@ -2991,24 +2994,24 @@ boolean ObjHit(int obx, int oby, int bits)
 
   if (bits & HIT_POS_CENTER)
   {
-    if (CheckLaserPixel(SX + obx + 15,
-			SY + oby + 15))
+    if (CheckLaserPixel(cSX + obx + 15,
+			cSY + oby + 15))
       return TRUE;
   }
 
   if (bits & HIT_POS_EDGE)
   {
     for (i = 0; i < 4; i++)
-      if (CheckLaserPixel(SX + obx + 31 * (i % 2),
-			  SY + oby + 31 * (i / 2)))
+      if (CheckLaserPixel(cSX + obx + 31 * (i % 2),
+			  cSY + oby + 31 * (i / 2)))
 	return TRUE;
   }
 
   if (bits & HIT_POS_BETWEEN)
   {
     for (i = 0; i < 4; i++)
-      if (CheckLaserPixel(SX + 4 + obx + 22 * (i % 2),
-			  SY + 4 + oby + 22 * (i / 2)))
+      if (CheckLaserPixel(cSX + 4 + obx + 22 * (i % 2),
+			  cSY + 4 + oby + 22 * (i / 2)))
 	return TRUE;
   }
 
@@ -3542,8 +3545,8 @@ static void GameActions_MM_Ext(struct MouseActionInfo action, boolean warp_mode)
 
 /*
     laser.num_edges--;
-    LX = laser.edge[laser.num_edges].x - (SX + 2);
-    LY = laser.edge[laser.num_edges].y - (SY + 2);
+    LX = laser.edge[laser.num_edges].x - cSX2;
+    LY = laser.edge[laser.num_edges].y - cSY2;
 */
 
     for (i = (laser.num_damages > 0 ? laser.num_damages - 1 : 0); i >= 0; i--)
@@ -3596,12 +3599,12 @@ static void GameActions_MM_Ext(struct MouseActionInfo action, boolean warp_mode)
     {
       if (laser.wall_mask & (1 << i))
       {
-	if (CheckLaserPixel(SX + ELX * TILEX + 14 + (i % 2) * 2,
-			    SY + ELY * TILEY + 31 * (i / 2)))
+	if (CheckLaserPixel(cSX + ELX * TILEX + 14 + (i % 2) * 2,
+			    cSY + ELY * TILEY + 31 * (i / 2)))
 	  break;
 
-	if (CheckLaserPixel(SX + ELX * TILEX + 31 * (i % 2),
-			    SY + ELY * TILEY + 14 + (i / 2) * 2))
+	if (CheckLaserPixel(cSX + ELX * TILEX + 31 * (i % 2),
+			    cSY + ELY * TILEY + 14 + (i / 2) * 2))
 	  break;
       }
     }
@@ -3612,8 +3615,8 @@ static void GameActions_MM_Ext(struct MouseActionInfo action, boolean warp_mode)
     {
       if (laser.wall_mask & (1 << i))
       {
-	if (CheckLaserPixel(SX + ELX * TILEX + 31 * (i % 2),
-			    SY + ELY * TILEY + 31 * (i / 2)))
+	if (CheckLaserPixel(cSX + ELX * TILEX + 31 * (i % 2),
+			    cSY + ELY * TILEY + 31 * (i / 2)))
 	  break;
       }
     }
@@ -3622,8 +3625,8 @@ static void GameActions_MM_Ext(struct MouseActionInfo action, boolean warp_mode)
 
     if (laser.num_beamers > 0 ||
 	k1 < 1 || k2 < 4 || k3 < 4 ||
-	CheckLaserPixel(SX + ELX * TILEX + 14,
-			SY + ELY * TILEY + 14))
+	CheckLaserPixel(cSX + ELX * TILEX + 14,
+			cSY + ELY * TILEY + 14))
     {
       laser.num_edges = r;
       laser.num_damages = d;
@@ -3838,8 +3841,8 @@ void MovePacMen()
       getGraphicSource(graphic, 0, &bitmap, &src_x, &src_y);
 
       CT = FrameCounter;
-      ox = SX + ox * TILEX;
-      oy = SY + oy * TILEY;
+      ox = cSX + ox * TILEX;
+      oy = cSY + oy * TILEY;
 
       for (i = 1; i < 33; i += 2)
 	BlitBitmap(bitmap, window,
@@ -4336,8 +4339,8 @@ static int getAngleFromTouchDelta(int dx, int dy,  int base)
 int getButtonFromTouchPosition(int x, int y, int dst_mx, int dst_my)
 {
   // calculate start (source) position to be at the middle of the tile
-  int src_mx = SX + x * TILESIZE_VAR + TILESIZE_VAR / 2;
-  int src_my = SY + y * TILESIZE_VAR + TILESIZE_VAR / 2;
+  int src_mx = cSX + x * TILESIZE_VAR + TILESIZE_VAR / 2;
+  int src_my = cSY + y * TILESIZE_VAR + TILESIZE_VAR / 2;
   int dx = dst_mx - src_mx;
   int dy = dst_my - src_my;
   int element;
diff --git a/src/game_mm/mm_main.c b/src/game_mm/mm_main.c
index 2209d092..7eafc2f5 100644
--- a/src/game_mm/mm_main.c
+++ b/src/game_mm/mm_main.c
@@ -31,6 +31,11 @@ struct LaserInfo	laser;
 short		LX,LY, XS,YS, ELX,ELY;
 short		CT,Ct;
 
+int		dSX, dSY;
+int		cSX, cSY;
+int		cSX2, cSY2;
+int		cFX, cFY;
+
 Pixel		pen_fg, pen_bg, pen_ray, pen_magicolor[2];
 int		color_status;
 
diff --git a/src/game_mm/mm_main.h b/src/game_mm/mm_main.h
index 3322a57e..de3248ae 100644
--- a/src/game_mm/mm_main.h
+++ b/src/game_mm/mm_main.h
@@ -251,6 +251,11 @@ extern struct GlobalInfo	global;
 extern short 		LX, LY, XS, YS, ELX, ELY;
 extern short 		CT, Ct;
 
+extern int		dSX, dSY;
+extern int		cSX, cSY;
+extern int		cSX2, cSY2;
+extern int		cFX, cFY;
+
 extern Pixel		pen_fg, pen_bg, pen_ray, pen_magicolor[2];
 extern int		color_status;
 
@@ -264,10 +269,6 @@ extern char	       *element_info[];
 extern int		num_element_info;
 
 /* often used screen positions */
-#define SX			8
-#define SY			8
-#define REAL_SX			(SX - 2)
-#define REAL_SY			(SY - 2)
 #define DX			534
 #define DY			60
 #define EX			DX
diff --git a/src/game_mm/mm_tools.c b/src/game_mm/mm_tools.c
index 93ab8221..1a27d91a 100644
--- a/src/game_mm/mm_tools.c
+++ b/src/game_mm/mm_tools.c
@@ -17,11 +17,34 @@
 #include "mm_tools.h"
 
 
+void SetDrawtoField_MM(int mode)
+{
+  int full_xsize = lev_fieldx * TILESIZE_VAR;
+  int full_ysize = lev_fieldy * TILESIZE_VAR;
+
+  // distance (delta) from screen border (SX/SY) to centered level playfield
+  dSX = (full_xsize < SXSIZE ? (SXSIZE - full_xsize) / 2 : 0);
+  dSY = (full_ysize < SYSIZE ? (SYSIZE - full_ysize) / 2 : 0);
+
+  // for convenience, absolute screen position to centered level playfield
+  cSX = SX + dSX;
+  cSY = SY + dSY;
+  cSX2 = SX + dSX + 2;	// including playfield border
+  cSY2 = SY + dSY + 2;	// including playfield border
+
+  if (mode == DRAW_TO_BACKBUFFER)
+  {
+    cFX = FX + dSX;
+    cFY = FY + dSY;
+  }
+}
+
 void ClearWindow()
 {
   ClearRectangle(backbuffer, REAL_SX, REAL_SY, FULL_SXSIZE, FULL_SYSIZE);
 
-  SetDrawtoField(DRAW_BACKBUFFER);
+  SetDrawtoField(DRAW_TO_BACKBUFFER);
+  SetDrawtoField_MM(DRAW_TO_BACKBUFFER);
 
   redraw_mask |= REDRAW_FIELD;
 }
@@ -34,7 +57,7 @@ void DrawGraphicAnimation_MM(int x, int y, int graphic, int frame)
   getGraphicSource(graphic, frame, &bitmap, &src_x, &src_y);
 
   BlitBitmap(bitmap, drawto_field, src_x, src_y, TILEX, TILEY,
-	     FX + x * TILEX, FY + y * TILEY);
+	     cFX + x * TILEX, cFY + y * TILEY);
 }
 
 void DrawGraphic_MM(int x, int y, int graphic)
@@ -48,7 +71,7 @@ void DrawGraphic_MM(int x, int y, int graphic)
   }
 #endif
 
-  DrawGraphicExt_MM(drawto_field, FX + x*TILEX, FY + y*TILEY, graphic);
+  DrawGraphicExt_MM(drawto_field, cFX + x * TILEX, cFY + y * TILEY, graphic);
 
   MarkTileDirty(x, y);
 }
@@ -74,7 +97,7 @@ void DrawGraphicThruMask_MM(int x, int y, int graphic)
   }
 #endif
 
-  DrawGraphicThruMaskExt_MM(drawto_field, FX + x * TILEX, FY + y * TILEY,
+  DrawGraphicThruMaskExt_MM(drawto_field, cFX + x * TILEX, cFY + y * TILEY,
 			    graphic);
 
   MarkTileDirty(x,y);
@@ -96,7 +119,7 @@ void DrawGraphicThruMaskExt_MM(DrawBuffer *d, int dest_x, int dest_y,
 
 void DrawMiniGraphic_MM(int x, int y, int graphic)
 {
-  DrawMiniGraphicExt_MM(drawto, SX + x * MINI_TILEX, SY + y * MINI_TILEY,
+  DrawMiniGraphicExt_MM(drawto, cSX + x * MINI_TILEX, cSY + y * MINI_TILEY,
 			graphic);
 
   MarkTileDirty(x / 2, y / 2);
@@ -205,8 +228,8 @@ void DrawGraphicShifted_MM(int x,int y, int dx,int dy, int graphic,
   src_x += cx;
   src_y += cy;
 
-  dest_x = FX + x * TILEX + dx;
-  dest_y = FY + y * TILEY + dy;
+  dest_x = cFX + x * TILEX + dx;
+  dest_y = cFY + y * TILEY + dy;
 
 #if DEBUG
   if (!IN_SCR_FIELD(x,y))
@@ -432,8 +455,8 @@ void DrawWallsExt_MM(int x, int y, int element, int draw_mask)
 
   for (i = 0; i < 4; i++)
   {
-    int dest_x = SX + x * TILEX + MINI_TILEX * (i % 2);
-    int dest_y = SY + y * TILEY + MINI_TILEY * (i / 2);
+    int dest_x = cSX + x * TILEX + MINI_TILEX * (i % 2);
+    int dest_y = cSY + y * TILEY + MINI_TILEY * (i / 2);
 
     if (!((1 << i) & draw_mask))
       continue;
@@ -472,8 +495,8 @@ void DrawWallsAnimation_MM(int x, int y, int element, int phase, int bit_mask)
       int frame;
       Bitmap *bitmap;
       int src_x, src_y;
-      int dst_x = SX + x * TILEX + (i % 2) * MINI_TILEX;
-      int dst_y = SY + y * TILEY + (i / 2) * MINI_TILEY;
+      int dst_x = cSX + x * TILEX + (i % 2) * MINI_TILEX;
+      int dst_y = cSY + y * TILEY + (i / 2) * MINI_TILEY;
 
       if (bit_mask & (1 << i))
       {
diff --git a/src/game_mm/mm_tools.h b/src/game_mm/mm_tools.h
index d7a050de..3fdee2fb 100644
--- a/src/game_mm/mm_tools.h
+++ b/src/game_mm/mm_tools.h
@@ -16,10 +16,6 @@
 
 #include "main_mm.h"
 
-/* for SetDrawtoField */
-#define DRAW_DIRECT		0
-#define DRAW_BUFFERED		1
-#define DRAW_BACKBUFFER		2
 
 /* for DrawElementShifted */
 #define NO_CUTTING		0
diff --git a/src/tools.c b/src/tools.c
index dc847065..695a5362 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -360,30 +360,26 @@ static int getLevelFromScreenY_SP(int sy)
 
 static int getLevelFromScreenX_MM(int sx)
 {
-#if 0
   int level_xsize = level.native_mm_level->fieldx;
   int full_xsize = level_xsize * TILESIZE_VAR;
 
   sx -= (full_xsize < SXSIZE ? (SXSIZE - full_xsize) / 2 : 0);
-#endif
 
   int px = sx - SX;
-  int lx = px / TILESIZE_VAR;
+  int lx = (px + TILESIZE_VAR) / TILESIZE_VAR - 1;
 
   return lx;
 }
 
 static int getLevelFromScreenY_MM(int sy)
 {
-#if 0
   int level_ysize = level.native_mm_level->fieldy;
   int full_ysize = level_ysize * TILESIZE_VAR;
 
   sy -= (full_ysize < SYSIZE ? (SYSIZE - full_ysize) / 2 : 0);
-#endif
 
   int py = sy - SY;
-  int ly = py / TILESIZE_VAR;
+  int ly = (py + TILESIZE_VAR) / TILESIZE_VAR - 1;
 
   return ly;
 }