Some bugs and more pointers for global data.

examples/ui/handle.d

@@ -18,7 +18,7 @@ bool update(float dt) {
     }
     // Create the drag handle and print if it is dragged.
     if (uiDragHandle(handleArea, handleOptions)) {
-        println(handleArea.position);
+        printfln("({}, {})", handleArea.position.x, handleArea.position.y);
     }
     return false;
 }

examples/ui/layout.d

@@ -21,14 +21,14 @@ bool update(float dt) {
     auto group = Rect();
     // Group 1.
     group = area.subTop(groupHeight);
-    uiText(group.subLeft(textWidth), "Cool Button", UiOptions(Alignment.left));
-    if (uiButton(group.subLeft(buttonWidth), "")) println("Cool");
+    uiText(group.subLeft(textWidth), "SUPER Button", UiOptions(Alignment.left));
+    if (uiButton(group.subLeft(buttonWidth), "")) println("SUPER");
     // Margin.
     area.subTop(groupMargin);
     // Group 2.
     group = area.subTop(groupHeight);
-    uiText(group.subLeft(textWidth), "Super Button", UiOptions(Alignment.left));
-    if (uiButton(group.subLeft(buttonWidth), "")) println("Super");
+    uiText(group.subLeft(textWidth), "HOT Button", UiOptions(Alignment.left));
+    if (uiButton(group.subLeft(buttonWidth), "")) println("HOT");
     return false;
 }
 

source/parin/engine.d

@@ -881,6 +881,7 @@ struct EngineViewport {
 
 /// The engine state.
 struct EngineState {
+    // LABEL
     EngineFlags flags;
     EngineFullscreenState fullscreenState;
     Sz tickCount;
@@ -1271,9 +1272,11 @@ void openUrl(IStr url = "https://github.com/Kapendev/parin") {
 void openWindow(int width, int height, const(IStr)[] args, IStr title = "Parin") {
     if (rl.IsWindowReady) return;
     engineState = cast(EngineState*) stdc.malloc(EngineState.sizeof);
+    stdc.memset(engineState, 0, EngineState.sizeof);
+    // This part is a hack for the `runGame` mixin.
     engineState.envArgsBuffer.clear();
     foreach (arg; args) engineState.envArgsBuffer.append(arg);
-    // Set raylib stuff.
+    // Raylib stuff.
     rl.SetConfigFlags(rl.FLAG_WINDOW_RESIZABLE | rl.FLAG_VSYNC_HINT);
     rl.SetTraceLogLevel(rl.LOG_ERROR);
     rl.InitWindow(width, height, title.toCStr().getOr());
@@ -1282,7 +1285,7 @@ void openWindow(int width, int height, const(IStr)[] args, IStr title = "Parin")
     rl.SetTargetFPS(60);
     rl.rlSetBlendFactorsSeparate(0x0302, 0x0303, 1, 0x0303, 0x8006, 0x8006);
     setWindowMinSize(240, 135);
-    // Set engine stuff.
+    // Engine stuff.
     engineState.flags.canUseAssetsPath = true;
     engineState.fullscreenState.previousWindowWidth = width;
     engineState.fullscreenState.previousWindowHeight = height;

source/parin/platformer.d

@@ -21,15 +21,18 @@ import joka.types;
 
 @safe @nogc nothrow:
 
-alias BaseBoxId      = int;
-alias BaseBoxIdGroup = FixedList!(BaseBoxId, 510);
-
-alias ActorBoxId     = BaseBoxId;
-alias ActorBoxFlags  = ubyte;
-alias WallBoxId      = BaseBoxId;
-alias WallBoxFlags   = ubyte;
-alias OneWaySide     = RideSide;
+alias BaseBoxId            = uint;
+alias BaseBoxFlags         = ubyte;
+alias WallBoxId            = BaseBoxId;
+alias WallBoxFlags         = BaseBoxFlags;
+alias ActorBoxId           = BaseBoxId;
+alias ActorBoxFlags        = BaseBoxFlags;
+alias TaggedBaseBoxId      = BaseBoxId;
+alias TaggedBaseBoxIdGroup = FixedList!(TaggedBaseBoxId, 510);
+alias OneWaySide           = RideSide;
 
+enum wallBoxTag      = 0;
+enum actorBoxTag     = 1;
 enum boxPassableFlag = 0x1;
 enum boxRidingFlag   = 0x2;
 
@@ -141,7 +144,7 @@ struct BoxWorld {
     List!ActorBoxProperties actorsProperties;
     List!ActorBoxId squishedIdsBuffer;
     List!BaseBoxId collisionIdsBuffer;
-    Grid!BaseBoxIdGroup grid;
+    Grid!TaggedBaseBoxIdGroup grid;
     int gridTileWidth;
     int gridTileHeight;
 
@@ -150,17 +153,25 @@ struct BoxWorld {
     void enableSpatialGrid(Sz rowCount, Sz colCount, int tileWidth, int tileHeight) {
         gridTileWidth = tileWidth;
         gridTileHeight = tileHeight;
+        grid.resizeBlank(rowCount, colCount);
+        foreach (ref group; grid) {
+            group.length = 0;
+        }
         foreach (i, ref properties; wallsProperties) {
             properties.gridX = walls[i].position.x / gridTileWidth - (walls[i].position.x < 0);
             properties.gridY = walls[i].position.y / gridTileHeight - (walls[i].position.y < 0);
+            // TODO: There are two problems to think about. Negative values and boxes touching more than one group.
+            auto id = cast(TaggedBaseBoxId) (i + 1);
+            id &= ~(1 << 31);
+            grid[properties.gridY, properties.gridX].append(id);
         }
         foreach (i, ref properties; actorsProperties) {
             properties.gridX = actors[i].position.x / gridTileWidth - (actors[i].position.x < 0);
             properties.gridY = actors[i].position.y / gridTileHeight - (actors[i].position.y < 0);
-        }
-        grid.resizeBlank(rowCount, colCount);
-        foreach (ref group; grid) {
-            group.length = 0;
+            // TODO: There are two problems to think about. Negative values and boxes touching more than one group.
+            auto id = cast(TaggedBaseBoxId) (i + 1);
+            id |= (1 << 31);
+            grid[properties.gridY, properties.gridX].append(id);
         }
     }
 
@@ -171,7 +182,7 @@ struct BoxWorld {
     }
 
     ref IRect getWall(WallBoxId id) {
-        if (id <= 0) {
+        if (id == 0) {
             assert(0, "ID `0` is always invalid and represents a box that was never created.");
         } else if (id > walls.length) {
             assert(0, "ID `{}` does not exist.".format(id));
@@ -180,7 +191,7 @@ struct BoxWorld {
     }
 
     ref IRect getActor(ActorBoxId id) {
-        if (id <= 0) {
+        if (id == 0) {
             assert(0, "ID `0` is always invalid and represents a box that was never created.");
         } else if (id > actors.length) {
             assert(0, "ID `{}` does not exist.".format(id));
@@ -189,7 +200,7 @@ struct BoxWorld {
     }
 
     ref WallBoxProperties getWallProperties(WallBoxId id) {
-        if (id <= 0) {
+        if (id == 0) {
             assert(0, "ID `0` is always invalid and represents a box that was never created.");
         } else if (id > wallsProperties.length) {
             assert(0, "ID `{}` does not exist.".format(id));
@@ -198,7 +209,7 @@ struct BoxWorld {
     }
 
     ref ActorBoxProperties getActorProperties(ActorBoxId id) {
-        if (id <= 0) {
+        if (id == 0) {
             assert(0, "ID `0` is always invalid and represents a box that was never created.");
         } else if (id > actorsProperties.length) {
             assert(0, "ID `{}` does not exist.".format(id));

source/parin/ui.d

@@ -10,13 +10,14 @@
 module parin.ui;
 
 import rl = parin.rl;
+import stdc = joka.stdc;
 import joka.ascii;
 import parin.engine;
 
 @safe @nogc nothrow:
 
-UiState uiState;
-UiState uiPreviousState;
+UiState* uiState;
+UiState* uiPreviousState;
 
 enum defaultUiDisabledColor = 0x202020.toRgb();
 enum defaultUiIdleColor = 0x414141.toRgb();
@@ -107,7 +108,22 @@ int findSpaceInTextField(IStr text) {
     return result;
 }
 
+@trusted
 void prepareUi() {
+    if (uiState == null) {
+        // NOTE: This will leak, but who cares.
+        uiState = cast(UiState*) stdc.malloc(UiState.sizeof);
+        uiPreviousState = cast(UiState*) stdc.malloc(UiState.sizeof);
+        stdc.memset(uiState, 0, UiState.sizeof);
+        stdc.memset(uiPreviousState, 0, UiState.sizeof);
+        // TODO: Should be changed to something better looking.
+        uiState.mouseClickAction = Mouse.left;
+        uiState.keyboardClickAction = Keyboard.enter;
+        uiState.gamepadClickAction = Gamepad.a;
+        uiPreviousState.mouseClickAction = Mouse.left;
+        uiPreviousState.keyboardClickAction = Keyboard.enter;
+        uiPreviousState.gamepadClickAction = Gamepad.a;
+    }
     setUiViewportState(Vec2(), resolution, Vec2(1.0f));
     uiState.itemId = 0;
     uiState.hotItemId = 0;
@@ -251,7 +267,7 @@ void wrapUiFocus(short step, Sz length) {
 }
 
 void updateUiState(Rect area, bool isHot, bool isActive, bool isClicked) {
-    uiPreviousState = uiState;
+    *uiPreviousState = *uiState;
     uiState.itemId += 1;
     if (isHot) {
         uiState.hotItemId = uiState.itemId;
@@ -396,7 +412,7 @@ bool updateUiDragHandle(ref Rect area, UiOptions options = UiOptions()) {
         auto m = (mouse - uiState.viewportPosition) / uiState.viewportScale; // NOTE: Maybe this should be a function?
         area.position.y = clamp(m.y + uiDragOffset.y, dragLimitY.x, dragLimitY.y - area.size.y);
         area.position.x = clamp(m.x + uiDragOffset.x, dragLimitX.x, dragLimitX.y - area.size.x);
-        uiState = uiPreviousState;
+        *uiState = *uiPreviousState;
         updateUiButton(area, "", options);
         return true;
     } else {