Merge pull request #4580 from NicolasBuecher/dev_add_RTT_format

Add format parameter to RenderTargetTexture constructor

dist/preview release/what's new.md

@@ -54,6 +54,7 @@
 - `Sound` now accepts `MediaStream` as source to enable easier WebAudio and WebRTC integrations ([menduz](https://github.com/menduz))
 - Vector x, y and z constructor parameters are now optional and default to 0 ([TrevorDev](https://github.com/TrevorDev))
 - New vertical mode for sliders in 2D GUI. [Demo](https://www.babylonjs-playground.com/#U9AC0N#53) ([Saket Saurabh](https://github.com/ssaket))
+- Add internal texture `format` support for RenderTargetCubeTexture ([PeapBoy](https://github.com/NicolasBuecher))
 
 ### glTF Loader
 

src/Materials/Textures/babylon.renderTargetTexture.ts

@@ -172,8 +172,9 @@
          * @param generateDepthBuffer True to generate a depth buffer
          * @param generateStencilBuffer True to generate a stencil buffer
          * @param isMulti True if multiple textures need to be created (Draw Buffers)
+         * @param format The internal format of the buffer in the RTT (RED, RG, RGB, RGBA, ALPHA...)
          */
-        constructor(name: string, size: number | {width: number, height: number} | {ratio: number}, scene: Nullable<Scene>, generateMipMaps?: boolean, doNotChangeAspectRatio: boolean = true, type: number = Engine.TEXTURETYPE_UNSIGNED_INT, public isCube = false, samplingMode = Texture.TRILINEAR_SAMPLINGMODE, generateDepthBuffer = true, generateStencilBuffer = false, isMulti = false) {
+        constructor(name: string, size: number | {width: number, height: number} | {ratio: number}, scene: Nullable<Scene>, generateMipMaps?: boolean, doNotChangeAspectRatio: boolean = true, type: number = Engine.TEXTURETYPE_UNSIGNED_INT, public isCube = false, samplingMode = Texture.TRILINEAR_SAMPLINGMODE, generateDepthBuffer = true, generateStencilBuffer = false, isMulti = false, format = Engine.TEXTUREFORMAT_RGBA) {
             super(null, scene, !generateMipMaps);
             scene = this.getScene();
 
@@ -204,6 +205,7 @@
             this._renderTargetOptions = {
                 generateMipMaps: generateMipMaps,
                 type: type,
+                format: format,
                 samplingMode: samplingMode,
                 generateDepthBuffer: generateDepthBuffer,
                 generateStencilBuffer: generateStencilBuffer