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/shaders.ts | 79 +++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/renderer/runtime/view/renderer/shaders.ts

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

diff --git a/src/renderer/runtime/view/renderer/shaders.ts b/src/renderer/runtime/view/renderer/shaders.ts
new file mode 100644
index 0000000..8fd1fda
--- /dev/null
+++ b/src/renderer/runtime/view/renderer/shaders.ts
@@ -0,0 +1,79 @@
+import fragmentShaderSrc from './shaders/default.fs';
+import vertexShaderSrc from './shaders/default.vs';
+
+export class Shaders {
+	public readonly viewportLoc: WebGLUniformLocation;
+	public readonly translateLoc: WebGLUniformLocation;
+
+	public readonly vertexPosLoc: number;
+	public readonly textureCoordLoc: number;
+	public readonly samplerLoc: WebGLUniformLocation;
+
+	constructor(private readonly gl: WebGLRenderingContext) {
+		const shaderProgram = this.gl.createProgram();
+		if (!shaderProgram)
+			throw new Error('Unable to create shader program');
+
+		const vertexShader = this.compileShader(this.gl.VERTEX_SHADER, vertexShaderSrc);
+		const fragmentShader = this.compileShader(this.gl.FRAGMENT_SHADER, fragmentShaderSrc);
+
+		this.gl.attachShader(shaderProgram, vertexShader);
+		this.gl.attachShader(shaderProgram, fragmentShader);
+
+		this.gl.linkProgram(shaderProgram);
+		if (!this.gl.getProgramParameter(shaderProgram, this.gl.LINK_STATUS)) {
+			const 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, 'aVertexPos');
+		this.gl.enableVertexAttribArray(this.vertexPosLoc);
+
+		this.textureCoordLoc = this.getAttribLocation(shaderProgram, 'aTextureCoord');
+		this.gl.enableVertexAttribArray(this.textureCoordLoc);
+
+		this.viewportLoc = this.getUniformLocation(shaderProgram, 'uViewport');
+		this.translateLoc = this.getUniformLocation(shaderProgram, 'uTranslate');
+		this.samplerLoc = this.getUniformLocation(shaderProgram, 'uSampler');
+	}
+
+	private compileShader(type: number, src: string): WebGLShader {
+		const 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)) {
+			const err = this.gl.getShaderInfoLog(shader);
+			this.gl.deleteShader(shader);
+			throw new Error('Unable to compile shader: ' + err);
+		}
+
+		return shader;
+	}
+
+	private getAttribLocation(program: WebGLProgram, name: string): number {
+		const ret = this.gl.getAttribLocation(program, name);
+		if (ret < 0)
+			throw new Error("unable to get location of attribute '" + name + "'");
+
+		return ret;
+	}
+
+	private getUniformLocation(program: WebGLProgram, name: string): WebGLUniformLocation {
+		const ret = this.gl.getUniformLocation(program, name);
+		if (!ret)
+			throw new Error("unable to get location of uniform '" + name + "'");
+
+		return ret;
+	}
+}
-- 
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