From a5e69edc5a6f1a95618c04e214d39b397577d796 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Mon, 11 Sep 2017 23:24:13 +0200
Subject: Code structuring

Also, use a fixed-size canvas for now.
---
 src/view/Renderer.ts | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 src/view/Renderer.ts

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

diff --git a/src/view/Renderer.ts b/src/view/Renderer.ts
new file mode 100644
index 0000000..556cfe3
--- /dev/null
+++ b/src/view/Renderer.ts
@@ -0,0 +1,124 @@
+import {mat4} from 'gl-matrix';
+
+
+class Renderer {
+	public gl: WebGLRenderingContext;
+
+	public vertexPosLoc: number;
+	private viewportLoc: WebGLUniformLocation;
+	private translateLoc: WebGLUniformLocation;
+
+	private viewport: mat4 = mat4.create();
+	private translate: mat4 = mat4.create();
+
+	private mkContext(): WebGLRenderingContext {
+		let gl = (this.canvas.getContext('webgl') || this.canvas.getContext('experimental-webgl')) as WebGLRenderingContext|null;
+		if (!gl)
+			throw new Error('unable to initialize WebGL context');
+
+		return gl;
+	}
+
+	getAttribLocation(program: WebGLProgram, name: string): number {
+		let ret = this.gl.getAttribLocation(program, name);
+		if (ret < 0)
+			throw new Error('unable to get location of attribute \'' + name + '\'');
+
+		return ret;
+	}
+
+	getUniformLocation(program: WebGLProgram, name: string): WebGLUniformLocation {
+		let ret = this.gl.getUniformLocation(program, name);
+		if (!ret)
+			throw new Error('unable to get location of uniform \'' + name + '\'');
+
+		return ret;
+	}
+
+	createBuffer(): WebGLBuffer {
+		let ret = this.gl.createBuffer();
+		if (!ret)
+			throw new Error('unable to create buffer');
+
+		return ret;
+	}
+
+	compileShader(type: number, src: string): WebGLShader {
+		let shader = this.gl.createShader(type);
+		if (!shader) {
+			throw new Error('Unable to create shader');
+		}
+
+		this.gl.shaderSource(shader, src);
+		this.gl.compileShader(shader);
+
+		if (!this.gl.getShaderParameter(shader, this.gl.COMPILE_STATUS)) {
+			let err = this.gl.getShaderInfoLog(shader);
+			this.gl.deleteShader(shader);
+			throw new Error('Unable to compile shader: ' + err);
+		}
+
+		return shader;
+	}
+
+	private initShaders(): void {
+		let shaderProgram = this.gl.createProgram();
+		if (!shaderProgram) {
+			throw new Error('Unable to create shader program');
+		}
+
+		let vertexShader = this.compileShader(this.gl.VERTEX_SHADER, require('./default.vs'));
+		let fragmentShader = this.compileShader(this.gl.FRAGMENT_SHADER, require('./default.fs'));
+
+
+		this.gl.attachShader(shaderProgram, vertexShader);
+		this.gl.attachShader(shaderProgram, fragmentShader);
+
+		this.gl.linkProgram(shaderProgram);
+		if (!this.gl.getProgramParameter(shaderProgram, this.gl.LINK_STATUS)) {
+			let err = this.gl.getProgramInfoLog(shaderProgram);
+
+			this.gl.deleteShader(vertexShader);
+			this.gl.deleteShader(fragmentShader);
+			this.gl.deleteProgram(shaderProgram);
+
+			throw new Error('Unable to link shader: ' + err);
+		}
+
+		this.gl.useProgram(shaderProgram);
+
+		this.vertexPosLoc = this.getAttribLocation(shaderProgram, 'vertexPos');
+		this.gl.enableVertexAttribArray(this.vertexPosLoc);
+
+		this.viewportLoc = this.getUniformLocation(shaderProgram, 'viewport');
+		this.translateLoc = this.getUniformLocation(shaderProgram, 'translate');
+	}
+
+	private setSize(): void {
+		let w = this.canvas.width;
+		let h = this.canvas.height;
+
+		this.gl.viewport(0, 0, w, h);
+		this.gl.clear(this.gl.COLOR_BUFFER_BIT | this.gl.DEPTH_BUFFER_BIT);
+
+		mat4.identity(this.viewport);
+		mat4.scale(this.viewport, this.viewport, [64 / w, 64 / h, 1.0]);
+		this.gl.uniformMatrix4fv(this.viewportLoc, false, this.viewport);
+
+		mat4.identity(this.translate);
+		this.gl.uniformMatrix4fv(this.translateLoc, false, this.translate);
+	}
+
+	constructor(private canvas: HTMLCanvasElement) {
+		this.gl = this.mkContext();
+
+		this.initShaders();
+
+		this.gl.clearColor(0.0, 0.0, 0.0, 1.0);
+		this.gl.enable(this.gl.DEPTH_TEST);
+
+		this.setSize();
+	}
+}
+
+export default Renderer;
-- 
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