Tile background flat (grnrock) the same as vanilla (#642)

Author: andrikpowell

prboom2/src/r_draw.c

@@ -569,19 +569,10 @@ void R_FillBackScreen (void)
         return;
       }
 
-      if (V_IsOpenGLMode())
-        V_FillFlat(grnrock.lumpnum, 1, 0, stbar_top, SCREENWIDTH, ST_SCALED_HEIGHT, VPT_STRETCH);
+      if (V_IsOpenGLMode()) // OpenGL has no way to adjust y-offset independent from height
+        V_FillFlat(grnrock.lumpnum, 1, 0, 0, SCREENWIDTH, SCREENHEIGHT, VPT_STRETCH);
       else
-      {
-        V_FillFlat(grnrock.lumpnum, 1,
-          0, stbar_top, ST_SCALED_OFFSETX, ST_SCALED_HEIGHT, VPT_STRETCH);
-        V_FillFlat(grnrock.lumpnum, 1,
-          SCREENWIDTH - ST_SCALED_OFFSETX, stbar_top, ST_SCALED_OFFSETX, ST_SCALED_HEIGHT, VPT_STRETCH);
-
-        // For custom huds, need to put the backfill inside the bar area (in the copy buffer)
-        V_FillFlat(grnrock.lumpnum, 0,
-          ST_SCALED_OFFSETX, stbar_top, SCREENWIDTH - 2 * ST_SCALED_OFFSETX, ST_SCALED_HEIGHT, VPT_STRETCH);
-      }
+        V_FillFlat(grnrock.lumpnum, 1, 0, stbar_top, SCREENWIDTH, ST_SCALED_HEIGHT, VPT_STRETCH);
 
       // heretic_note: I think this looks bad, so I'm skipping it...
       if (!heretic)

prboom2/src/v_video.c

@@ -278,7 +278,7 @@ static void FUNC_V_FillFlat(int lump, int scrn, int x, int y, int width, int hei
 
   for (sy = y; sy < y + height; ++sy)
   {
-    src_y_offset = 64 * ((int) ((sy - y) / ratio_y) % 64);
+    src_y_offset = 64 * ((int) (sy / ratio_y) % 64);
     dest = screens[scrn].data + pitch * sy + x;
 
     for (sx = x; sx < x + width; ++sx)