Split up engine.{h,cpp}

Untangles dependencies by splitting up `engine.{h,cpp}` into 3 files:

1. `primitive_render`
2. `ticks` -- only contains `GetAnimationFrame` for now.
3. `GetWidth2` renamed to `CalculateSpriteTileCenterX` and moved to `levels/dun_tile.hpp`.

Source/CMakeLists.txt

@@ -13,7 +13,6 @@ set(libdevilutionx_SRCS
   diablo.cpp
   diablo_msg.cpp
   doom.cpp
-  engine.cpp
   gamemenu.cpp
   gmenu.cpp
   help.cpp
@@ -112,11 +111,13 @@ set(libdevilutionx_SRCS
   engine/random.cpp
   engine/sound_position.cpp
   engine/surface.cpp
+  engine/ticks.cpp
   engine/trn.cpp
 
   engine/render/automap_render.cpp
   engine/render/clx_render.cpp
   engine/render/dun_render.cpp
+  engine/render/primitive_render.cpp
   engine/render/scrollrt.cpp
   engine/render/text_render.cpp
 

Source/DiabloUI/diabloui.cpp

@@ -21,6 +21,7 @@
 #include "engine/dx.h"
 #include "engine/load_pcx.hpp"
 #include "engine/render/clx_render.hpp"
+#include "engine/ticks.hpp"
 #include "hwcursor.hpp"
 #include "utils/algorithm/container.hpp"
 #include "utils/display.h"

Source/appfat.cpp

@@ -6,8 +6,13 @@
 
 #include <config.h>
 
+#include <SDL.h>
 #include <fmt/format.h>
 
+#ifdef USE_SDL1
+#include "utils/sdl2_to_1_2_backports.h"
+#endif
+
 #include "diablo.h"
 #include "multi.h"
 #include "storm/storm_net.hpp"

Source/appfat.h

@@ -7,8 +7,6 @@
 
 #include <string_view>
 
-#include <SDL.h>
-
 #include "utils/attributes.h"
 
 namespace devilution {

Source/automap.cpp

@@ -14,6 +14,7 @@
 #include "engine/load_file.hpp"
 #include "engine/palette.h"
 #include "engine/render/automap_render.hpp"
+#include "engine/render/primitive_render.hpp"
 #include "levels/gendung.h"
 #include "levels/setmaps.h"
 #include "player.h"

Source/control.h

@@ -20,7 +20,6 @@
 
 #include "DiabloUI/text_input.hpp"
 #include "DiabloUI/ui_flags.hpp"
-#include "engine.h"
 #include "engine/displacement.hpp"
 #include "engine/point.hpp"
 #include "engine/rectangle.hpp"

Source/controls/modifier_hints.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "engine.h"
+#include "engine/surface.hpp"
 
 namespace devilution {
 

Source/controls/touch/event_handlers.cpp

@@ -4,7 +4,7 @@
 #include "controls/plrctrls.h"
 #include "cursor.h"
 #include "diablo.h"
-#include "engine.h"
+#include "engine/render/primitive_render.hpp"
 #include "engine/render/scrollrt.h"
 #include "gmenu.h"
 #include "inv.h"

Source/controls/touch/renderers.cpp

@@ -4,9 +4,9 @@
 #include "cursor.h"
 #include "diablo.h"
 #include "doom.h"
-#include "engine.h"
 #include "engine/events.hpp"
 #include "engine/render/clx_render.hpp"
+#include "engine/render/primitive_render.hpp"
 #include "init.h"
 #include "inv.h"
 #include "levels/gendung.h"

Source/cursor.cpp

@@ -17,12 +17,12 @@
 #include "control.h"
 #include "controls/plrctrls.h"
 #include "doom.h"
-#include "engine.h"
 #include "engine/backbuffer_state.hpp"
 #include "engine/demomode.h"
 #include "engine/point.hpp"
 #include "engine/points_in_rectangle_range.hpp"
 #include "engine/render/clx_render.hpp"
+#include "engine/render/primitive_render.hpp"
 #include "engine/trn.hpp"
 #include "hwcursor.hpp"
 #include "inv.h"

Source/cursor.h

@@ -6,11 +6,11 @@
 #pragma once
 
 #include <cstdint>
-#include <optional>
-#include <utility>
 
-#include "engine.h"
 #include "engine/clx_sprite.hpp"
+#include "engine/point.hpp"
+#include "engine/size.hpp"
+#include "engine/surface.hpp"
 #include "utils/attributes.h"
 #include "utils/enum_traits.h"
 

Source/dead.h

@@ -5,11 +5,11 @@
  */
 #pragma once
 
-#include <array>
+#include <cstddef>
 #include <cstdint>
 
-#include "engine.h"
 #include "engine/clx_sprite.hpp"
+#include "engine/direction.hpp"
 #include "engine/point.hpp"
 
 namespace devilution {

Source/debug.h

@@ -6,13 +6,14 @@
 #pragma once
 
 #include <cstdint>
+#include <string>
 #include <string_view>
 
 #include <ankerl/unordered_dense.h>
 
 #include "diablo.h"
-#include "engine.h"
 #include "engine/clx_sprite.hpp"
+#include "engine/point.hpp"
 
 namespace devilution {
 

Source/diablo_msg.cpp

@@ -13,6 +13,7 @@
 #include "DiabloUI/ui_flags.hpp"
 #include "engine/clx_sprite.hpp"
 #include "engine/render/clx_render.hpp"
+#include "engine/render/primitive_render.hpp"
 #include "engine/render/text_render.hpp"
 #include "panels/info_box.hpp"
 #include "utils/algorithm/container.hpp"

Source/diablo_msg.hpp

@@ -6,10 +6,9 @@
 #pragma once
 
 #include <cstdint>
-#include <string>
 #include <string_view>
 
-#include "engine.h"
+#include "engine/surface.hpp"
 
 namespace devilution {
 

Source/doom.cpp

@@ -8,10 +8,10 @@
 #include <optional>
 
 #include "control.h"
-#include "engine.h"
 #include "engine/clx_sprite.hpp"
 #include "engine/load_cel.hpp"
 #include "engine/render/clx_render.hpp"
+#include "engine/render/primitive_render.hpp"
 
 namespace devilution {
 namespace {

Source/doom.h

@@ -5,7 +5,7 @@
  */
 #pragma once
 
-#include "engine.h"
+#include "engine/surface.hpp"
 
 namespace devilution {
 

Source/engine/backbuffer_state.cpp

@@ -1,5 +1,6 @@
 #include "engine/backbuffer_state.hpp"
 
+#include <array>
 #include <vector>
 
 #include "engine/dx.h"

Source/engine/clx_sprite.hpp

@@ -25,7 +25,7 @@
 
 #include <cstddef>
 #include <cstdint>
-
+#include <cstring>
 #include <iterator>
 #include <memory>
 

Source/engine/displacement.hpp

@@ -7,6 +7,7 @@
 #include <ostream>
 #endif
 
+#include "appfat.h"
 #include "engine/direction.hpp"
 #include "engine/size.hpp"
 #include "utils/attributes.h"

Source/engine/dx.cpp

@@ -9,7 +9,7 @@
 #include <cstdint>
 
 #include "controls/plrctrls.h"
-#include "engine.h"
+#include "engine/render/primitive_render.hpp"
 #include "options.h"
 #include "utils/display.h"
 #include "utils/log.hpp"

Source/engine/dx.h

@@ -5,7 +5,9 @@
  */
 #pragma once
 
-#include "engine.h"
+#include <SDL.h>
+
+#include "engine/surface.hpp"
 
 namespace devilution {
 

Source/engine/events.cpp

@@ -3,8 +3,8 @@
 #include <cstdint>
 
 #include "controls/input.h"
-#include "engine.h"
 #include "engine/demomode.h"
+#include "engine/render/primitive_render.hpp"
 #include "interfac.h"
 #include "movie.h"
 #include "options.h"

Source/engine/point.hpp

@@ -237,4 +237,47 @@ DVL_ALWAYS_INLINE constexpr PointOf<PointCoordT> abs(PointOf<PointCoordT> a)
 	return { std::abs(a.x), std::abs(a.y) };
 }
 
+/**
+ * @brief Calculate the best fit direction between two points
+ * @param start Tile coordinate
+ * @param destination Tile coordinate
+ * @return A value from the direction enum
+ */
+inline Direction GetDirection(Point start, Point destination)
+{
+	Direction md;
+
+	int mx = destination.x - start.x;
+	int my = destination.y - start.y;
+	if (mx >= 0) {
+		if (my >= 0) {
+			if (5 * mx <= (my * 2)) // mx/my <= 0.4, approximation of tan(22.5)
+				return Direction::SouthWest;
+			md = Direction::South;
+		} else {
+			my = -my;
+			if (5 * mx <= (my * 2))
+				return Direction::NorthEast;
+			md = Direction::East;
+		}
+		if (5 * my <= (mx * 2)) // my/mx <= 0.4
+			md = Direction::SouthEast;
+	} else {
+		mx = -mx;
+		if (my >= 0) {
+			if (5 * mx <= (my * 2))
+				return Direction::SouthWest;
+			md = Direction::West;
+		} else {
+			my = -my;
+			if (5 * mx <= (my * 2))
+				return Direction::NorthEast;
+			md = Direction::North;
+		}
+		if (5 * my <= (mx * 2))
+			md = Direction::NorthWest;
+	}
+	return md;
+}
+
 } // namespace devilution

Source/engine/render/automap_render.cpp

@@ -4,10 +4,12 @@
  * Line drawing routines for the automap.
  */
 #include "engine/render/automap_render.hpp"
-#include "automap.h"
 
 #include <cstdint>
 
+#include "automap.h"
+#include "engine/render/primitive_render.hpp"
+
 namespace devilution {
 namespace {
 

Source/engine/render/automap_render.hpp

@@ -12,8 +12,8 @@
 
 #include <cstdint>
 
-#include "engine.h"
 #include "engine/point.hpp"
+#include "engine/surface.hpp"
 
 namespace devilution {
 

Source/engine/render/clx_render.hpp

@@ -14,9 +14,9 @@
 #include <string>
 #endif
 
-#include "engine.h"
 #include "engine/clx_sprite.hpp"
 #include "engine/point.hpp"
+#include "engine/surface.hpp"
 #include "lighting.h"
 
 namespace devilution {