controller: clean up GameContext a bit

1 files changed, 11 insertions, 2 deletions

diff --git a/src/view/renderer/Renderer.ts b/src/view/renderer/Renderer.ts
index 344bccf..75dc265 100644
--- a/src/view/renderer/Renderer.ts
+++ b/src/view/renderer/Renderer.ts
@@ -3,6 +3,8 @@ import { mat4, vec2 } from 'gl-matrix';
 import Shaders from './Shaders';
 
 export default class Renderer {
+	private readonly viewScale = 64;
+
 	private readonly gl: WebGLRenderingContext;
 	private readonly shaders: Shaders;
 
@@ -49,11 +51,12 @@ export default class Renderer {
 	}
 
 	public setCenter(v: vec2|number[]) {
-		vec2.copy(this.center, v);
+		this.snapToGrid(this.center, v);
 	}
 
 	public setTranslation(v: vec2|number[]) {
 		vec2.sub(this.translation, v, this.center);
+		this.snapToGrid(this.translation, this.translation);
 		this.gl.uniform2fv(this.shaders.translateLoc, this.translation);
 	}
 
@@ -63,6 +66,12 @@ export default class Renderer {
 		this.setTranslation([0, 0]);
 	}
 
+	public snapToGrid(out: vec2, a: vec2|number[]): void {
+		vec2.scale(out, a, this.viewScale);
+		vec2.round(out, out);
+		vec2.scale(out, out, 1 / this.viewScale);
+	}
+
 	private mkContext(): WebGLRenderingContext {
 		const gl = (
 			this.canvas.getContext('webgl') || this.canvas.getContext('experimental-webgl')
@@ -81,7 +90,7 @@ export default class Renderer {
 		this.clear();
 
 		mat4.identity(this.viewport);
-		mat4.scale(this.viewport, this.viewport, [2 * 64 / w, -2 * 64 / h, 1.0]);
+		mat4.scale(this.viewport, this.viewport, [2 * this.viewScale / w, -2 * this.viewScale / h, 1.0]);
 		this.gl.uniformMatrix4fv(this.shaders.viewportLoc, false, this.viewport);
 	}
 }