Archive commit

src/ts/graphics/baseStateBatch.ts

@@ -0,0 +1,76 @@
+import { ObjectCache } from '../common/utils';
+import { Matrix2D, Rect } from '../common/interfaces';
+import { createMat2D, copyMat2D, mulMat2D, rotateMat2D, scaleMat2D, translateMat2D } from '../common/mat2d';
+import { rect, copyRect } from '../common/rect';
+
+interface SavedState {
+	globalAlpha: number;
+	transform: Matrix2D;
+	hasCrop: boolean;
+	cropRect: Rect;
+}
+
+function createEmptyState(): SavedState {
+	return {
+		transform: createMat2D(),
+		globalAlpha: 1,
+		hasCrop: false,
+		cropRect: rect(0, 0, 0, 0),
+	};
+}
+
+const stateCache = new ObjectCache<SavedState>(10, createEmptyState);
+
+export abstract class BaseStateBatch {
+	globalAlpha = 1;
+	transform = createMat2D();
+	private savedStates: SavedState[] = [];
+	protected hasCrop = false;
+	protected cropRect = rect(0, 0, 0, 0);
+	crop(x: number, y: number, w: number, h: number) {
+		// console.error('Crop not supported');
+		this.hasCrop = true;
+		this.cropRect.x = x;
+		this.cropRect.y = y;
+		this.cropRect.w = w;
+		this.cropRect.h = h;
+	}
+	clearCrop() {
+		this.hasCrop = false;
+	}
+	save() {
+		const state = stateCache.get();
+		state.globalAlpha = this.globalAlpha;
+		state.hasCrop = this.hasCrop;
+		copyMat2D(state.transform, this.transform);
+		copyRect(state.cropRect, this.cropRect);
+		this.savedStates.push(state);
+
+		if (DEVELOPMENT && this.savedStates.length > 100) {
+			console.error('More than 100 save states');
+		}
+	}
+	restore() {
+		const state = this.savedStates.pop();
+
+		if (state !== undefined) {
+			this.globalAlpha = state.globalAlpha;
+			this.hasCrop = state.hasCrop;
+			copyMat2D(this.transform, state.transform);
+			copyRect(this.cropRect, state.cropRect);
+			stateCache.put(state);
+		}
+	}
+	translate(x: number, y: number) {
+		translateMat2D(this.transform, this.transform, x, y);
+	}
+	scale(x: number, y: number) {
+		scaleMat2D(this.transform, this.transform, x, y);
+	}
+	rotate(angle: number) {
+		rotateMat2D(this.transform, this.transform, angle);
+	}
+	multiplyTransform(mat: Matrix2D) {
+		mulMat2D(this.transform, this.transform, mat);
+	}
+}