Add new updateTextureData to engine

src/Engines/thinEngine.ts

@@ -3213,6 +3213,34 @@ export class ThinEngine {
         gl.texImage2D(target, lod, internalFormat, width, height, 0, format, textureType, imageData);
     }
 
+    /**
+     * Update a portion of an internal texture
+     * @param texture defines the texture to update
+     * @param imageData defines the data to store into the texture
+     * @param xOffset defines the x coordinates of the update rectangle
+     * @param yOffset defines the y coordinates of the update rectangle
+     * @param width defines the width of the update rectangle
+     * @param height defines the height of the update rectangle 
+     * @param faceIndex defines the face index if texture is a cube (0 by default)
+     * @param lod defines the lod level to update (0 by default)
+     */
+    public updateTextureData(texture: InternalTexture, imageData: ArrayBufferView, xOffset: number, yOffset: number, width: number, height: number, faceIndex: number = 0, lod: number = 0): void {
+        var gl = this._gl;
+
+        var textureType = this._getWebGLTextureType(texture.type);
+        var format = this._getInternalFormat(texture.format);
+
+        this._unpackFlipY(texture.invertY);
+
+        var target = gl.TEXTURE_2D;
+        if (texture.isCube) {
+            target = gl.TEXTURE_CUBE_MAP_POSITIVE_X + faceIndex;
+        }
+
+        gl.texSubImage2D(target, lod, xOffset, yOffset, width, height, format, textureType, imageData);
+    }
+
+
     /** @hidden */
     public _uploadArrayBufferViewToTexture(texture: InternalTexture, imageData: ArrayBufferView, faceIndex: number = 0, lod: number = 0): void {
         var gl = this._gl;