Everything is back to normal now.

.gitignore

@@ -2,13 +2,13 @@
 docs.json
 __dummy.html
 docs/
-/popka
+/parin
-popka.so
+parin.so
-popka.dylib
+parin.dylib
-popka.dll
+parin.dll
-popka.a
+parin.a
-popka.lib
+parin.lib
-popka-test-*
+parin-test-*
 *.exe
 *.pdb
 *.o

TOUR.md

@@ -115,7 +115,7 @@ void updateSound(SoundId sound);
 ## Drawing
 
 Parin provides a set of drawing functions inside the `parin.engine` module.
-While drawing is not pixel-perfect by default, it can be by calling the `setIsPixelPerfect` function.
+While drawing is not pixel-perfect by default, it can be by calling the `setIsPixelPerfect` or `setIsPixelSnapped` function.
 
 ```d
 void drawRect(Rect area, Color color = white);

examples/coins.d

@@ -4,7 +4,6 @@ import parin;
 // The game variables.
 auto player = Rect(16, 16);
 auto playerSpeed = 120;
-
 auto coins = SparseList!Rect();
 auto coinSize = Vec2(8);
 auto maxCoinCount = 8;

examples/dialogue.d

@@ -1,5 +1,6 @@
 /// This example shows how to use the Parin dialogue system.
 import parin;
+import parin.dialogue;
 
 // The game variables.
 auto dialogue = Dialogue();

examples/map.d

@@ -19,38 +19,36 @@ void ready() {
 }
 
 bool update(float dt) {
-    // Make some options.
+    // Make the drawing options.
     auto mapOptions = DrawOptions(Hook.center);
     mapOptions.scale = Vec2(2);
     auto tileOptions = mapOptions;
     tileOptions.flip = tileLookDirection > 0 ? Flip.x : Flip.none;
 
-    // Move tile and camera.
+    // Move the tile and camera.
     tile.position += wasd * Vec2(tileSpeed * dt);
-    camera.followPosition(tile.position, tileSpeed);
+    camera.position = tile.position;
     if (wasd.x != 0) tileLookDirection = cast(int) wasd.normalize.round.x;
+
     // Check for collisions.
-    auto colRow1 = map.firstMapPosition(camera.area.topLeftPoint, mapOptions);
+    auto collisionArea = Rect();
-    auto colRow2 = map.lastMapPosition(camera.area.bottomRightPoint, mapOptions);
+    foreach (gridPosition; map.gridPositions(camera.topLeftPoint, camera.bottomRightPoint, mapOptions)) {
-    foreach (row; colRow1.y .. colRow2.y) {
+        if (map[gridPosition] == -1) continue;
-        foreach (col; colRow1.x .. colRow2.x) {
+        auto gridTileArea = Rect(map.worldPosition(gridPosition, mapOptions), Vec2(16) * mapOptions.scale);
-            if (map[row, col] == -1) continue;
+        while (gridTileArea.hasIntersection(Rect(tile.position, tile.size * mapOptions.scale).area(tileOptions.hook))) {
-            // TODO: Yeah, maybe change it to something better...
+            tile.position -= wasd * Vec2(dt);
-            auto mapTileRect = Rect(map.worldPosition(row, col, mapOptions), Vec2(16) * mapOptions.scale);
+            camera.position = tile.position;
-            auto myTileRect = Rect(tile.position, tile.size * mapOptions.scale).area(Hook.center);
+            collisionArea = gridTileArea;
-            if (mapTileRect.hasIntersection(myTileRect)) {
-                tile.position -= wasd * Vec2(tileSpeed * dt);
-                camera.followPosition(tile.position, tileSpeed);
-                break;
-            }
         }
     }
 
-    // Draw game.
+    // Draw the game.
     camera.attach();
     drawTileMap(atlas, map, camera, mapOptions);
     drawTile(atlas, tile, tileOptions);
+    drawRect(collisionArea, yellow.alpha(120));
     camera.detach();
+    drawDebugText("Move with arrow keys.", Vec2(8));
     return false;
 }
 

examples/pong.d

@@ -75,7 +75,6 @@ bool update(float dt) {
     drawRect(ball.centerArea);
     drawRect(paddle1.centerArea);
     drawRect(paddle2.centerArea);
-
     // Draw the counter.
     auto textOptions = DrawOptions(Hook.center);
     textOptions.scale = Vec2(2);

examples/scene.d

@@ -51,7 +51,7 @@ struct Scene2 {
             sceneManager.enter!Scene1();
         }
 
-        drawDebugText("Press enter to change scene.", resolution * Vec2(0.5), DrawOptions(Hook.center));
+        drawDebugText("Press space to change scene.", resolution * Vec2(0.5), DrawOptions(Hook.center));
         drawDebugText("Scene 2\nNo counter here.", Vec2(8));
         return false;
     }

source/parin/dialogue.d

@@ -40,7 +40,7 @@ struct DialogueUnit {
     LStr text;
     DialogueUnitKind kind;
 
-    @safe:
+    @safe @nogc nothrow:
 
     void free() {
         text.free();
@@ -52,7 +52,7 @@ struct DialogueValue {
     LStr name;
     long value;
 
-    @safe:
+    @safe @nogc nothrow:
 
     void free() {
         name.free();
@@ -60,7 +60,7 @@ struct DialogueValue {
     }
 }
 
-alias DialogueCommandRunner = void function(IStr[] args);
+alias DialogueCommandRunner = void function(IStr[] args) @trusted;
 
 struct Dialogue {
     List!DialogueUnit units;
@@ -69,7 +69,13 @@ struct Dialogue {
     IStr actor;
     Sz unitIndex;
 
-    @safe:
+    @trusted
+    void run(DialogueCommandRunner runner) {
+        runner(args);
+        update();
+    }
+
+    @safe @nogc nothrow:
 
     bool isEmpty() {
         return units.length == 0;
@@ -169,11 +175,6 @@ struct Dialogue {
         update();
     }
 
-    void run(DialogueCommandRunner runner) {
-        runner(args);
-        update();
-    }
-
     // TODO: Remove the asserts!
     void update() {
         if (units.length != 0 && unitIndex < units.length - 1) {
@@ -331,6 +332,8 @@ struct Dialogue {
     }
 }
 
+@safe @nogc nothrow:
+
 bool isValidDialogueUnitKind(char c) {
     foreach (kind; DialogueUnitKindChars) {
         if (c == kind) {

source/parin/engine.d

@@ -24,7 +24,7 @@ public import joka.faults;
 public import joka.math;
 public import joka.types;
 
-@safe:
+@safe @nogc nothrow:
 
 EngineState engineState;
 
@@ -160,7 +160,7 @@ struct DrawOptions {
     Hook hook      = Hook.topLeft; /// An value representing the origin point of the drawn object when origin is set to zero.
     Flip flip      = Flip.none;    /// An value representing flipping orientations.
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Initializes the options with the given scale.
     this(Vec2 scale) {
@@ -196,7 +196,7 @@ struct Camera {
     bool isAttached;       /// Indicates whether the camera is currently in use.
     bool isCentered;       /// Determines if the camera's origin is at the center instead of the top left.
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Initializes the camera with the given position and optional centering.
     this(float x, float y, bool isCentered = false) {
@@ -210,11 +210,61 @@ struct Camera {
         return isCentered ? Hook.center : Hook.topLeft;
     }
 
+    /// Returns the origin of the camera.
+    Vec2 origin() {
+        return Rect(position, resolution).origin(hook);
+    }
+
     /// Returns the area covered by the camera.
     Rect area() {
         return Rect(position, resolution).area(hook);
     }
 
+    /// Returns the top left point of the camera.
+    Vec2 topLeftPoint() {
+        return area.topLeftPoint;
+    }
+
+    /// Returns the top point of the camera.
+    Vec2 topPoint() {
+        return area.topPoint;
+    }
+
+    /// Returns the top right point of the camera.
+    Vec2 topRightPoint() {
+        return area.topRightPoint;
+    }
+
+    /// Returns the left point of the camera.
+    Vec2 leftPoint() {
+        return area.leftPoint;
+    }
+
+    /// Returns the center point of the camera.
+    Vec2 centerPoint() {
+        return area.centerPoint;
+    }
+
+    /// Returns the right point of the camera.
+    Vec2 rightPoint() {
+        return area.rightPoint;
+    }
+
+    /// Returns the bottom left point of the camera.
+    Vec2 bottomLeftPoint() {
+        return area.bottomLeftPoint;
+    }
+
+    /// Returns the bottom point of the camera.
+    Vec2 bottomPoint() {
+        return area.bottomPoint;
+    }
+
+    /// Returns the bottom right point of the camera.
+    Vec2 bottomRightPoint() {
+        return area.bottomRightPoint;
+    }
+
     /// Moves the camera to follow the target position at the specified speed.
     void followPosition(Vec2 target, float speed) {
         position = position.moveTo(target, Vec2(speed));
@@ -243,7 +293,7 @@ struct Camera {
         }
         isAttached = true;
         auto temp = this.toRl();
-        if (isPixelPerfect) {
+        if (isPixelSnapped || isPixelPerfect) {
             temp.target.x = floor(temp.target.x);
             temp.target.y = floor(temp.target.y);
             temp.offset.x = floor(temp.offset.x);
@@ -267,7 +317,7 @@ struct TextId {
     GenerationalIndex data;
     alias data this;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Returns the length of the text associated with the resource identifier.
     Sz length() {
@@ -304,7 +354,7 @@ struct TextId {
 struct Texture {
     rl.Texture2D data;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Checks if the texture is not loaded.
     bool isEmpty() {
@@ -349,7 +399,7 @@ struct TextureId {
     GenerationalIndex data;
     alias data this;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Returns the width of the texture associated with the resource identifier.
     int width() {
@@ -398,7 +448,7 @@ struct Font {
     int runeSpacing; /// The spacing between individual characters.
     int lineSpacing; /// The spacing between lines of text.
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Checks if the font is not loaded.
     bool isEmpty() {
@@ -433,7 +483,7 @@ struct FontId {
     GenerationalIndex data;
     alias data this;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Returns the spacing between individual characters of the font associated with the resource identifier.
     int runeSpacing() {
@@ -480,7 +530,7 @@ struct FontId {
 struct Sound {
     Variant!(rl.Sound, rl.Music) data;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Checks if the sound is not loaded.
     bool isEmpty() {
@@ -575,7 +625,7 @@ struct SoundId {
     GenerationalIndex data;
     alias data this;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Returns the current playback time of the sound associated with the resource identifier.
     float time() {
@@ -621,7 +671,7 @@ struct SoundId {
 struct Viewport {
     rl.RenderTexture2D data;
 
-    @safe:
+    @safe @nogc nothrow:
 
     /// Checks if the viewport is not loaded.
     bool isEmpty() {
@@ -663,6 +713,7 @@ struct Viewport {
 
 struct EngineFlags {
     bool isUpdating;
+    bool isPixelSnapped;
     bool isPixelPerfect;
     bool isCursorVisible;
 }
@@ -678,7 +729,7 @@ struct EngineResourceGroup(T) {
     GenerationalList!LStr names;
     GenerationalList!Sz tags;
 
-    @safe:
+    @safe @nogc nothrow:
 
     Sz length() {
         return data.length;
@@ -741,7 +792,7 @@ struct EngineResources {
     EngineResourceGroup!Font fonts;
     EngineResourceGroup!Sound sounds;
 
-    @safe:
+    @safe @nogc nothrow:
 
     void free(Sz tag = 0) {
         texts.free(tag);
@@ -757,7 +808,7 @@ struct EngineViewport {
     int targetHeight;
     alias data this;
 
-    @safe:
+    @safe @nogc nothrow:
 
     bool isLocking() {
         return (targetWidth != 0 && targetHeight != 0) && (data.width != targetWidth && data.height != targetHeight);
@@ -792,7 +843,7 @@ struct EngineState {
     Filter defaultFilter;
     Sz tickCount;
 
-    @safe:
+    @safe @nogc nothrow:
 
     void free() {
         debug {
@@ -1170,8 +1221,9 @@ void openWindow(int width, int height, IStr appPath, IStr title = "Parin") {
 /// You should avoid calling this function manually.
 @trusted
 void updateWindow(bool function(float dt) updateFunc) {
-    static bool function(float _dt) @trusted _updateFunc;
+    static bool function(float _dt) @trusted @nogc nothrow _updateFunc;
 
+    @trusted @nogc nothrow
     static bool _updateWindow() {
         // Begin drawing.
         if (isResolutionLocked) {
@@ -1193,10 +1245,9 @@ void updateWindow(bool function(float dt) updateFunc) {
             auto ratio = maxSize / minSize;
             auto minRatio = min(ratio.x, ratio.y);
             if (isPixelPerfect) {
-                // TODO: Make an equals function in Joka that can change the epsilon value.
                 auto roundMinRatio = round(minRatio);
                 auto floorMinRation = floor(minRatio);
-                minRatio = (abs(minRatio - roundMinRatio) < 0.015f) ? roundMinRatio : floorMinRation;
+                minRatio = minRatio.equals(roundMinRatio, 0.015f) ? roundMinRatio : floorMinRation;
             }
 
             auto targetSize = minSize * Vec2(minRatio);
@@ -1253,7 +1304,7 @@ void updateWindow(bool function(float dt) updateFunc) {
     }
 
     // Maybe bad idea, but makes life of no-attribute people easier.
-    _updateFunc = cast(bool function(float _dt) @trusted) updateFunc;
+    _updateFunc = cast(bool function(float _dt) @trusted @nogc nothrow) updateFunc;
     engineState.flags.isUpdating = true;
 
     version(WebAssembly) {
@@ -1284,6 +1335,21 @@ void closeWindow() {
     rl.CloseWindow();
 }
 
+/// Returns true if the drawing is snapped to pixel coordinates.
+bool isPixelSnapped() {
+    return engineState.flags.isPixelSnapped;
+}
+
+/// Sets whether drawing should be snapped to pixel coordinates.
+void setIsPixelSnapped(bool value) {
+    engineState.flags.isPixelSnapped = value;
+}
+
+/// Toggles whether drawing is snapped to pixel coordinates on or off.
+void toggleIsPixelSnapped() {
+    setIsPixelSnapped(!isPixelSnapped);
+}
+
 /// Returns true if the drawing is done in a pixel perfect way.
 bool isPixelPerfect() {
     return engineState.flags.isPixelPerfect;
@@ -1490,10 +1556,9 @@ Vec2 mouseScreenPosition() {
         auto window = windowSize;
         auto minRatio = min(window.x / engineState.viewport.width, window.y / engineState.viewport.height);
         if (isPixelPerfect) {
-            // TODO: Make an equals function in Joka that can change the epsilon value.
             auto roundMinRatio = round(minRatio);
             auto floorMinRation = floor(minRatio);
-            minRatio = (abs(minRatio - roundMinRatio) < 0.015f) ? roundMinRatio : floorMinRation;
+            minRatio = minRatio.equals(roundMinRatio, 0.015f) ? roundMinRatio : floorMinRation;
         }
         auto targetSize = engineState.viewport.size * Vec2(minRatio);
         // We use touch because it works on desktop, web and mobile.
@@ -1781,7 +1846,7 @@ void updateSound(SoundId sound) {
 /// Draws a rectangle with the specified area and color.
 @trusted
 void drawRect(Rect area, Color color = white) {
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.DrawRectanglePro(area.floor().toRl(), rl.Vector2(0.0f, 0.0f), 0.0f, color.toRl());
     } else {
         rl.DrawRectanglePro(area.toRl(), rl.Vector2(0.0f, 0.0f), 0.0f, color.toRl());
@@ -1796,7 +1861,7 @@ void drawVec2(Vec2 point, float size, Color color = white) {
 /// Draws a circle with the specified area and color.
 @trusted
 void drawCirc(Circ area, Color color = white) {
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.DrawCircleV(area.position.floor().toRl(), area.radius, color.toRl());
     } else {
         rl.DrawCircleV(area.position.toRl(), area.radius, color.toRl());
@@ -1806,7 +1871,7 @@ void drawCirc(Circ area, Color color = white) {
 /// Draws a line with the specified area, thickness, and color.
 @trusted
 void drawLine(Line area, float size, Color color = white) {
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.DrawLineEx(area.a.floor().toRl(), area.b.floor().toRl(), size, color.toRl());
     } else {
         rl.DrawLineEx(area.a.toRl(), area.b.toRl(), size, color.toRl());
@@ -1839,7 +1904,7 @@ void drawTextureArea(Texture texture, Rect area, Vec2 position, DrawOptions opti
     }
 
     auto origin = options.origin == Vec2() ? target.origin(options.hook) : options.origin;
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.DrawTexturePro(
             texture.data,
             area.floor().toRl(),
@@ -1885,14 +1950,14 @@ void drawRune(Font font, dchar rune, Vec2 position, DrawOptions options = DrawOp
     auto rect = toParin(rl.GetGlyphAtlasRec(font.data, rune));
     auto origin = options.origin == Vec2() ? rect.origin(options.hook) : options.origin;
     rl.rlPushMatrix();
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.rlTranslatef(position.x.floor(), position.y.floor(), 0.0f);
     } else {
         rl.rlTranslatef(position.x, position.y, 0.0f);
     }
     rl.rlRotatef(options.rotation, 0.0f, 0.0f, 1.0f);
     rl.rlScalef(options.scale.x, options.scale.y, 1.0f);
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.rlTranslatef(-origin.x.floor(), -origin.y.floor(), 0.0f);
     } else {
         rl.rlTranslatef(-origin.x, -origin.y, 0.0f);
@@ -1916,14 +1981,14 @@ void drawText(Font font, IStr text, Vec2 position, DrawOptions options = DrawOpt
     // TODO: Make it work with negative scale values.
     auto origin = Rect(measureTextSize(font, text)).origin(options.hook);
     rl.rlPushMatrix();
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.rlTranslatef(floor(position.x), floor(position.y), 0.0f);
     } else {
         rl.rlTranslatef(position.x, position.y, 0.0f);
     }
     rl.rlRotatef(options.rotation, 0.0f, 0.0f, 1.0f);
     rl.rlScalef(options.scale.x, options.scale.y, 1.0f);
-    if (isPixelPerfect) {
+    if (isPixelSnapped || isPixelPerfect) {
         rl.rlTranslatef(floor(-origin.x), floor(-origin.y), 0.0f);
     } else {
         rl.rlTranslatef(-origin.x, -origin.y, 0.0f);

source/parin/package.d

@@ -10,7 +10,6 @@ module parin;
 
 public import joka.ascii;
 public import joka.io;
-public import parin.dialogue;
 public import parin.engine;
 public import parin.scene;
 public import parin.sprite;

source/parin/rl/raylib.d

@@ -1258,7 +1258,6 @@ void OpenURL (const(char)* url); // Open URL with default system browser (if ava
 
 // NOTE: Following functions implemented in module [utils]
 //------------------------------------------------------------------
-void TraceLog (int logLevel, const(char)* text, ...); // Show trace log messages (LOG_DEBUG, LOG_INFO, LOG_WARNING, LOG_ERROR...)
 void SetTraceLogLevel (int logLevel); // Set the current threshold (minimum) log level
 void* MemAlloc (uint size); // Internal memory allocator
 void* MemRealloc (void* ptr, uint size); // Internal memory reallocator
@@ -1641,7 +1640,6 @@ const(char)* CodepointToUTF8 (int codepoint, int* utf8Size); // Encode one codep
 int TextCopy (char* dst, const(char)* src); // Copy one string to another, returns bytes copied
 bool TextIsEqual (const(char)* text1, const(char)* text2); // Check if two text string are equal
 uint TextLength (const(char)* text); // Get text length, checks for '\0' ending
-const(char)* TextFormat (const(char)* text, ...); // Text formatting with variables (sprintf() style)
 const(char)* TextSubtext (const(char)* text, int position, int length); // Get a piece of a text string
 char* TextReplace (char* text, const(char)* replace, const(char)* by); // Replace text string (WARNING: memory must be freed!)
 char* TextInsert (const(char)* text, const(char)* insert, int position); // Insert text in a position (WARNING: memory must be freed!)

source/parin/sprite.d

@@ -14,7 +14,7 @@ module parin.sprite;
 
 import parin.engine;
 
-@safe:
+@safe @nogc nothrow:
 
 struct SpriteAnimation {
     ubyte frameRow;
@@ -28,7 +28,7 @@ struct SpriteAnimationGroup2 {
     ubyte frameSpeed = 6;
     enum angleStep = 180.0f;
 
-    @safe:
+    @safe @nogc nothrow:
 
     SpriteAnimation pick(float angle) {
         auto id = (cast(int) round(snap(angle, angleStep) / angleStep)) % frameRows.length;
@@ -42,7 +42,7 @@ struct SpriteAnimationGroup4 {
     ubyte frameSpeed = 6;
     enum angleStep = 90.0f;
 
-    @safe:
+    @safe @nogc nothrow:
 
     SpriteAnimation pick(float angle) {
         // NOTE: This is a hack to make things look better in simple cases.
@@ -61,7 +61,7 @@ struct SpriteAnimationGroup8 {
     ubyte frameSpeed = 6;
     enum angleStep = 45.0f;
 
-    @safe:
+    @safe @nogc nothrow:
 
     SpriteAnimation pick(float angle) {
         auto id = (cast(int) round(snap(angle, angleStep) / angleStep)) % frameRows.length;
@@ -75,7 +75,7 @@ struct SpriteAnimationGroup16 {
     ubyte frameSpeed = 6;
     enum angleStep = 22.5f;
 
-    @safe:
+    @safe @nogc nothrow:
 
     SpriteAnimation pick(float angle) {
         auto id = (cast(int) round(snap(angle, angleStep) / angleStep)) % frameRows.length;
@@ -92,7 +92,7 @@ struct Sprite {
     SpriteAnimation animation;
     Vec2 position;
 
-    @safe:
+    @safe @nogc nothrow:
 
     this(int width, int height, ushort atlasLeft, ushort atlasTop, SpriteAnimation animation = SpriteAnimation()) {
         this.width = width;

source/parin/tilemap.d

@@ -21,7 +21,7 @@ public import joka.faults;
 public import joka.math;
 public import joka.types;
 
-@safe:
+@safe @nogc nothrow:
 
 struct Tile {
     Sz id;
@@ -29,7 +29,7 @@ struct Tile {
     int height;
     Vec2 position;
 
-    @safe:
+    @safe @nogc nothrow:
 
     Vec2 size() {
         return Vec2(width, height);
@@ -67,13 +67,13 @@ struct TileMap {
     Vec2 position;
     alias data this;
 
-    @safe:
+    @safe @nogc nothrow:
 
     this(short value, int tileWidth, int tileHeight) {
         this.tileWidth = tileWidth;
         this.tileHeight = tileHeight;
-        this.estimatedMaxRowCount = data.maxRowCount;
+        this.estimatedMaxRowCount = maxRowCount;
-        this.estimatedMaxColCount = data.maxColCount;
+        this.estimatedMaxColCount = maxColCount;
         this.data.fill(value);
     }
 
@@ -134,7 +134,7 @@ struct TileMap {
         position = position.moveToWithSlowdown(target, Vec2(deltaTime), slowdown);
     }
 
-    /// Returns the top left world position of a tile.
+    /// Returns the top left world position of a grid position.
     Vec2 worldPosition(Sz row, Sz col, DrawOptions options = DrawOptions()) {
         auto targetTileWidth = cast(int) (tileWidth * options.scale.x);
         auto targetTileHeight = cast(int) (tileHeight * options.scale.y);
@@ -147,7 +147,12 @@ struct TileMap {
         return temp.area(options.hook).position;
     }
 
-    IVec2 firstMapPosition(Vec2 topLeftWorldPosition, DrawOptions options = DrawOptions()) {
+    /// Returns the top left world position of a grid position.
+    Vec2 worldPosition(IVec2 gridPosition, DrawOptions options = DrawOptions()) {
+        return worldPosition(gridPosition.y, gridPosition.x, options);
+    }
+
+    IVec2 firstGridPosition(Vec2 topLeftWorldPosition, DrawOptions options = DrawOptions()) {
         auto result = IVec2();
         auto targetTileWidth = cast(int) (tileWidth * options.scale.x);
         auto targetTileHeight = cast(int) (tileHeight * options.scale.y);
@@ -156,7 +161,7 @@ struct TileMap {
         return result;
     }
 
-    IVec2 lastMapPosition(Vec2 bottomRightWorldPosition, DrawOptions options = DrawOptions()) {
+    IVec2 lastGridPosition(Vec2 bottomRightWorldPosition, DrawOptions options = DrawOptions()) {
         auto result = IVec2();
         auto targetTileWidth = cast(int) (tileWidth * options.scale.x);
         auto targetTileHeight = cast(int) (tileHeight * options.scale.y);
@@ -165,6 +170,37 @@ struct TileMap {
         result.x = cast(int) floor(clamp((bottomRightWorldPosition.x - position.x) / targetTileWidth + extraTileCount, 0, estimatedMaxColCount));
         return result;
     }
+
+    auto gridPositions(Vec2 topLeftWorldPosition, Vec2 bottomRightWorldPosition, DrawOptions options = DrawOptions()) {
+        static struct Range {
+            IVec2 first;
+            IVec2 last;
+            IVec2 position;
+
+            bool empty() {
+                return position == last;
+            }
+            
+            IVec2 front() {
+                return position;
+            }
+            
+            void popFront() {
+                position.x += 1;
+                if (position.x >= TileMap.maxColCount) {
+                    position.x = first.x;
+                    position.y += 1;
+                }
+            }
+        }
+
+        auto result = Range(
+            firstGridPosition(topLeftWorldPosition, options),
+            lastGridPosition(bottomRightWorldPosition, options),
+        );
+        result.position = result.first;
+        return result;
+    }
 }
 
 Result!TileMap toTileMap(IStr csv, int tileWidth, int tileHeight) {
@@ -185,6 +221,7 @@ Result!TileMap loadRawTileMap(IStr path, int tileWidth, int tileHeight) {
 }
 
 void drawTile(Texture texture, Tile tile, DrawOptions options = DrawOptions()) {
+    if (texture.isEmpty) return;
     drawTextureArea(texture, tile.textureArea(texture.width / tile.width), tile.position, options);
 }
 
@@ -195,9 +232,8 @@ void drawTile(TextureId texture, Tile tile, DrawOptions options = DrawOptions())
 void drawTileMap(Texture texture, TileMap map, Camera camera, DrawOptions options = DrawOptions()) {
     auto targetTileWidth = cast(int) (map.tileWidth * options.scale.x);
     auto targetTileHeight = cast(int) (map.tileHeight * options.scale.y);
-    auto cameraArea = camera.area;
+    auto colRow1 = map.firstGridPosition(camera.topLeftPoint, options);
-    auto colRow1 = map.firstMapPosition(cameraArea.topLeftPoint, options);
+    auto colRow2 = map.lastGridPosition(camera.bottomRightPoint, options);
-    auto colRow2 = map.lastMapPosition(cameraArea.bottomRightPoint, options);
     if (colRow1.x == colRow2.x || colRow1.y == colRow2.y) return;
 
     foreach (row; colRow1.y .. colRow2.y) {

source/parin/timer.d

@@ -13,7 +13,7 @@ module parin.timer;
 
 import joka.math;
 
-@safe:
+@safe @nogc nothrow:
 
 struct Timer {
     float time = 1.0f;
@@ -22,7 +22,7 @@ struct Timer {
     bool isPaused;
     bool canRepeat;
 
-    @safe:
+    @safe @nogc nothrow:
 
     this(float duration, bool canRepeat = false) {
         this.time = duration;