From 9f2e4e6996fb96d23e1ca29667130a2111a59de5 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Thu, 1 Nov 2018 00:59:13 +0100
Subject: Do not use default exports

---
 src/view/renderer/renderer.ts | 96 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/view/renderer/renderer.ts

(limited to 'src/view/renderer/renderer.ts')

diff --git a/src/view/renderer/renderer.ts b/src/view/renderer/renderer.ts
new file mode 100644
index 0000000..062c868
--- /dev/null
+++ b/src/view/renderer/renderer.ts
@@ -0,0 +1,96 @@
+import { Shaders } from './shaders';
+
+import { mat4, vec2 } from 'gl-matrix';
+
+export class Renderer {
+	private readonly viewScale = 64;
+
+	private readonly gl: WebGLRenderingContext;
+	private readonly shaders: Shaders;
+
+	private readonly center: vec2 = vec2.create();
+	private readonly translation: vec2 = vec2.create();
+	private readonly viewport: mat4 = mat4.create();
+
+	constructor(private readonly canvas: HTMLCanvasElement) {
+		this.gl = this.mkContext();
+
+		this.shaders = new Shaders(this.gl);
+
+		this.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+
+		this.gl.enable(this.gl.BLEND);
+		this.gl.blendFunc(this.gl.ONE, this.gl.ONE_MINUS_SRC_ALPHA);
+		this.gl.pixelStorei(this.gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1);
+
+		this.setSize();
+	}
+
+	public createBuffer(): WebGLBuffer {
+		const ret = this.gl.createBuffer();
+		if (!ret)
+			throw new Error('unable to create buffer');
+
+		return ret;
+	}
+
+	public getContext(): WebGLRenderingContext {
+		return this.gl;
+	}
+
+	public getVertexPosLoc(): number {
+		return this.shaders.vertexPosLoc;
+	}
+
+	public getTextureCoordLoc(): number {
+		return this.shaders.textureCoordLoc;
+	}
+
+	public getSamplerLoc(): WebGLUniformLocation {
+		return this.shaders.samplerLoc;
+	}
+
+	public setCenter(v: vec2|number[]) {
+		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);
+	}
+
+	public clear(): void {
+		this.gl.clear(this.gl.COLOR_BUFFER_BIT);
+
+		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')
+		);
+		if (!gl)
+			throw new Error('unable to initialize WebGL context');
+
+		return gl;
+	}
+
+	private setSize(): void {
+		const w = this.canvas.width;
+		const h = this.canvas.height;
+
+		this.gl.viewport(0, 0, w, h);
+		this.clear();
+
+		mat4.identity(this.viewport);
+		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);
+	}
+}
-- 
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