From a56415fa2655214d0ee68340ed109242764fe6f6 Mon Sep 17 00:00:00 2001
From: Bouillaguet Quentin <git@desplandis.fr>
Date: Mon, 11 Sep 2023 15:22:49 +0200
Subject: [PATCH] refactor(View): Deprecate WebGL 1.0 support

---
 src/Core/Deprecated/Undeprecator.js | 6 ++++++
 src/Core/View.js                    | 6 ------
 src/Renderer/c3DEngine.js           | 3 +++
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/Core/Deprecated/Undeprecator.js b/src/Core/Deprecated/Undeprecator.js
index c69a3adcc1..8008b5e829 100644
--- a/src/Core/Deprecated/Undeprecator.js
+++ b/src/Core/Deprecated/Undeprecator.js
@@ -74,4 +74,10 @@ export const deprecatedFeature2MeshOptions = (options) => {
     }
 };
 
+export const deprecatedC3DEngineWebGLOptions = (options) => {
+    if (options.isWebGL2 === false) {
+        console.warn('WebGL1 support (isWebGL2=false) is deprecated and will be removed in iTowns 2.43. This follows its deprecation by three.js. If you are impacted by this change, please discuss in the following issue: https://github.com/iTowns/itowns/issues/2152.');
+    }
+};
+
 export default {};
diff --git a/src/Core/View.js b/src/Core/View.js
index f10f53df2f..639fa670a0 100644
--- a/src/Core/View.js
+++ b/src/Core/View.js
@@ -131,11 +131,6 @@ class View extends THREE.EventDispatcher {
      * var view = itowns.View('EPSG:4326', viewerDiv, { camera: { type: itowns.CAMERA_TYPE.ORTHOGRAPHIC } });
      * var customControls = itowns.THREE.OrbitControls(view.camera.camera3D, viewerDiv);
      *
-     * @example <caption><b>Enable WebGl 1.0 instead of WebGl 2.0.</b></caption>
-     * var viewerDiv = document.getElementById('viewerDiv');
-     * const extent = new Extent('EPSG:3946', 1837816.94334, 1847692.32501, 5170036.4587, 5178412.82698);
-     * var view = new itowns.View('EPSG:4326', viewerDiv, {  renderer: { isWebGL2: false } });
-     *
      * @param {string} crs - The default CRS of Three.js coordinates. Should be a cartesian CRS.
      * @param {HTMLElement} viewerDiv - Where to instanciate the Three.js scene in the DOM
      * @param {Object=} options - Optional properties.
@@ -145,7 +140,6 @@ class View extends THREE.EventDispatcher {
      * a default one will be constructed. In this case, if options.renderer is an object, it will be used to
      * configure the renderer (see {@link c3DEngine}.  If not present, a new &lt;canvas> will be created and
      * added to viewerDiv (mutually exclusive with mainLoop)
-     * @param {boolean} [options.renderer.isWebGL2=true] - enable webgl 2.0 for THREE.js.
      * @param {?Scene} [options.scene3D] - [THREE.Scene](https://threejs.org/docs/#api/en/scenes/Scene) instance to use, otherwise a default one will be constructed
      * @param {?Color} options.diffuse - [THREE.Color](https://threejs.org/docs/?q=color#api/en/math/Color) Diffuse color terrain material.
      * This color is applied to terrain if there isn't color layer on terrain extent (by example on pole).
diff --git a/src/Renderer/c3DEngine.js b/src/Renderer/c3DEngine.js
index 669a0cc1ad..cb1faf5904 100644
--- a/src/Renderer/c3DEngine.js
+++ b/src/Renderer/c3DEngine.js
@@ -9,10 +9,13 @@ import Capabilities from 'Core/System/Capabilities';
 import { unpack1K } from 'Renderer/LayeredMaterial';
 import WEBGL from 'ThreeExtended/capabilities/WebGL';
 import Label2DRenderer from 'Renderer/Label2DRenderer';
+import { deprecatedC3DEngineWebGLOptions } from 'Core/Deprecated/Undeprecator';
 
 const depthRGBA = new THREE.Vector4();
 class c3DEngine {
     constructor(rendererOrDiv, options = {}) {
+        deprecatedC3DEngineWebGLOptions(options);
+
         const NOIE = !Capabilities.isInternetExplorer();
         // pick sensible default options
         if (options.antialias === undefined) {