added format parameter to DynamicTexture

src/Materials/Textures/babylon.dynamicTexture.ts

@@ -6,8 +6,8 @@ module BABYLON {
         private _canvas: HTMLCanvasElement;
         private _context: CanvasRenderingContext2D;
 
-        constructor(name: string, options: any, scene: Scene, generateMipMaps: boolean, samplingMode: number = Texture.TRILINEAR_SAMPLINGMODE) {
-            super(null, scene, !generateMipMaps);
+        constructor(name: string, options: any, scene: Scene, generateMipMaps: boolean, samplingMode: number = Texture.TRILINEAR_SAMPLINGMODE, format: number = Engine.TEXTUREFORMAT_RGBA) {
+            super(null, scene, !generateMipMaps, undefined, samplingMode, undefined, undefined, undefined, undefined, format);
 
             this.name = name;
 
@@ -64,7 +64,7 @@ module BABYLON {
         }
 
         public update(invertY?: boolean): void {
-            this.getScene().getEngine().updateDynamicTexture(this._texture, this._canvas, invertY === undefined ? true : invertY);
+            this.getScene().getEngine().updateDynamicTexture(this._texture, this._canvas, invertY === undefined ? true : invertY, undefined, this._format);
         }
 
         public drawText(text: string, x: number, y: number, font: string, color: string, clearColor: string, invertY?: boolean, update = true) {

src/babylon.engine.ts

@@ -2322,13 +2322,14 @@
              texture.samplingMode = samplingMode;
         }
 
-        public updateDynamicTexture(texture: WebGLTexture, canvas: HTMLCanvasElement, invertY: boolean, premulAlpha: boolean = false): void {
+        public updateDynamicTexture(texture: WebGLTexture, canvas: HTMLCanvasElement, invertY: boolean, premulAlpha: boolean = false, format?: number): void {
             this._bindTextureDirectly(this._gl.TEXTURE_2D, texture);
             this._gl.pixelStorei(this._gl.UNPACK_FLIP_Y_WEBGL, invertY ? 1 : 0);
             if (premulAlpha) {
                 this._gl.pixelStorei(this._gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1);
             }
-            this._gl.texImage2D(this._gl.TEXTURE_2D, 0, this._gl.RGBA, this._gl.RGBA, this._gl.UNSIGNED_BYTE, canvas);
+            let internalFormat = format ? this._getInternalFormat(format) : this._gl.RGBA;
+            this._gl.texImage2D(this._gl.TEXTURE_2D, 0, internalFormat, internalFormat, this._gl.UNSIGNED_BYTE, canvas);
             if (texture.generateMipMaps) {
                 this._gl.generateMipmap(this._gl.TEXTURE_2D);
             }