Archive commit

src/ts/graphics/webgl/webglUtils.ts

@@ -0,0 +1,67 @@
+import { WEBGL_CREATION_ERROR } from '../../common/errors';
+
+export function getRenderTargetSize(width: number, height: number) {
+	const max = Math.max(width, height);
+	let pow = 256;
+
+	while (pow < max) {
+		pow *= 2;
+	}
+
+	return pow;
+}
+
+export function getWebGLContext(canvas: HTMLCanvasElement): WebGLRenderingContext {
+	const options: WebGLContextAttributes = {
+		alpha: false,
+		premultipliedAlpha: false,
+		antialias: false,
+	};
+
+	const gl = canvas.getContext('webgl2', options)
+		|| canvas.getContext('webgl', options)
+		|| canvas.getContext('experimental-webgl', options);
+
+	if (!gl) {
+		throw new Error(WEBGL_CREATION_ERROR);
+	}
+
+	return gl;
+}
+
+export function isWebGL2(gl: WebGLRenderingContext | undefined) {
+	return !!(gl && gl.MAX_ELEMENT_INDEX);
+}
+
+export function getWebGLError(gl: WebGLRenderingContext) {
+	const error = gl.getError();
+
+	switch (error) {
+		case gl.NO_ERROR: return 'NO_ERROR';
+		case gl.INVALID_ENUM: return 'INVALID_ENUM';
+		case gl.INVALID_VALUE: return 'INVALID_VALUE';
+		case gl.INVALID_OPERATION: return 'INVALID_OPERATION';
+		case gl.INVALID_FRAMEBUFFER_OPERATION: return 'INVALID_FRAMEBUFFER_OPERATION';
+		case gl.OUT_OF_MEMORY: return 'OUT_OF_MEMORY';
+		case gl.CONTEXT_LOST_WEBGL: return 'CONTEXT_LOST_WEBGL';
+		default: return `${error}`;
+	}
+}
+
+export function unbindAllTexturesAndBuffers(gl: WebGLRenderingContext) {
+	try {
+		const numTextureUnits = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS) | 0;
+
+		for (let i = 0; i < numTextureUnits; i++) {
+			gl.activeTexture(gl.TEXTURE0 + i);
+			gl.bindTexture(gl.TEXTURE_2D, null);
+		}
+
+		gl.bindBuffer(gl.ARRAY_BUFFER, null);
+		gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
+		gl.bindRenderbuffer(gl.RENDERBUFFER, null);
+		gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+	} catch (e) {
+		DEVELOPMENT && console.error(e);
+	}
+}