view: remove support for non-power-of-2 sprites again

Sprites with unusual dimensions must be padded with transparency. By only
supporting power-of-two sprites, the anchor point can always be specified
accurately.

3 files changed, 8 insertions, 11 deletions

diff --git a/dist/resources/sprite/entity/red_ellipse.png b/dist/resources/sprite/entity/red_ellipse.png
index 48fc2c0..9acf873 100644
--- a/dist/resources/sprite/entity/red_ellipse.png
+++ b/dist/resources/sprite/entity/red_ellipse.png
diff --git a/src/view/entity.ts b/src/view/entity.ts
index 7600826..83cd955 100644
--- a/src/view/entity.ts
+++ b/src/view/entity.ts
@@ -14,9 +14,10 @@ export async function loadEntity(
 	const sprites: SpriteView[] = [];
 
 	for (let frame = 0; frame < data.frames; frame++) {
-		const [texture, size, coords] = mkTexture(r, tile, frame, data.frames);
+		const [texture, coords] = mkTexture(r, tile, frame, data.frames);
 
-		const offset = vec2.mul(vec2.create(), data.anchor, size);
+		const offset = vec2.fromValues(coords[2] - coords[0], coords[3] - coords[1]);
+		vec2.mul(offset, offset, data.anchor);
 		r.snapToGrid(offset, offset);
 
 		const anchorCoords: SpriteCoords = [
diff --git a/src/view/util/image.ts b/src/view/util/image.ts
index 7baeccc..4c5e386 100644
--- a/src/view/util/image.ts
+++ b/src/view/util/image.ts
@@ -16,18 +16,17 @@ export function mkTexture(
 	src: HTMLCanvasElement|HTMLImageElement,
 	frame: number = 0,
 	total: number = 1,
-): [WebGLTexture, [number, number], SpriteCoords] {
+): [WebGLTexture, SpriteCoords] {
 	const gl = r.getContext();
 	const texture = gl.createTexture();
 	if (!texture)
 		throw new Error('unable to create texture');
 
 	const w = src.width, h = src.height / total;
-	const w2 = nextPowerOf2(w), h2 = nextPowerOf2(h);
 
 	const canvas = document.createElement('canvas');
-	canvas.width = w2;
-	canvas.height = h2;
+	canvas.width = w;
+	canvas.height = h;
 
 	const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
 	ctx.drawImage(src, 0, frame * h, w, h, 0, 0, w, h);
@@ -39,12 +38,9 @@ export function mkTexture(
 	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
 	gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
 
-	const size: [number, number] = [
-		w / r.coordScale, h / r.coordScale,
-	];
 	const coords: SpriteCoords = [
-		0, 0, w2 / r.coordScale, h2 / r.coordScale,
+		0, 0, w / r.coordScale, h / r.coordScale,
 	];
 
-	return [texture, size, coords];
+	return [texture, coords];
 }