From 3c51a1994f41b625823c4f15e92396b5498ce23c Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Tue, 24 Dec 2019 13:53:16 +0100
Subject: Move renderer into "runtime" subdirectory

---
 src/renderer/runtime/view/renderer/renderer.ts | 100 +++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 src/renderer/runtime/view/renderer/renderer.ts

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

diff --git a/src/renderer/runtime/view/renderer/renderer.ts b/src/renderer/runtime/view/renderer/renderer.ts
new file mode 100644
index 0000000..9f711d3
--- /dev/null
+++ b/src/renderer/runtime/view/renderer/renderer.ts
@@ -0,0 +1,100 @@
+import { nextPowerOf2 } from '../../util';
+import { Shaders } from './shaders';
+
+import { mat4, vec2 } from 'gl-matrix';
+
+export class Renderer {
+	public readonly coordScale = 32;
+	private readonly viewScale = 2;
+
+	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);
+	}
+
+	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.coordScale);
+		vec2.round(out, out);
+		vec2.scale(out, out, 1 / this.coordScale);
+	}
+
+	public resize(): void {
+		const w = this.canvas.width;
+		const h = this.canvas.height;
+		const ws = nextPowerOf2(w);
+		const hs = nextPowerOf2(h);
+
+		this.gl.viewport((w - ws) / 2, (h - hs) / 2, ws, hs);
+		this.clear();
+
+		const scale = this.viewScale * this.coordScale;
+
+		mat4.identity(this.viewport);
+		mat4.scale(this.viewport, this.viewport, [2 * scale / ws, -2 * scale / hs, 1.0]);
+		this.gl.uniformMatrix4fv(this.shaders.viewportLoc, false, this.viewport);
+	}
+
+	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;
+	}
+}
-- 
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