Fixing issues using TexStorage2D with compressed textures

Source/modules/webgl/WebGLRenderingContextBase.cpp

Index: Source/modules/webgl/WebGLRenderingContextBase.cpp
diff --git a/Source/modules/webgl/WebGLRenderingContextBase.cpp b/Source/modules/webgl/WebGLRenderingContextBase.cpp
index cad3a3dbf67478d1a0014cd6ce52133e2abef3f4..4e839ed31742c6b1fd349de5cd915bf3fe3e48a6 100644
--- a/Source/modules/webgl/WebGLRenderingContextBase.cpp
+++ b/Source/modules/webgl/WebGLRenderingContextBase.cpp
@@ -1824,7 +1824,7 @@ void WebGLRenderingContextBase::compressedTexSubImage2D(GLenum target, GLint lev
     if (!tex)
         return;
 
-    if (format != tex->getInternalFormat(target, level)) {
+    if (!isWebGL2OrHigher() && format != tex->getInternalFormat(target, level)) {

[Zhenyao Mo, 2015/07/29 20:57:57]

It might be OK for now, but we do need to validate (internal_format, format)
combination for WebGL 2 here. In general, we should validate everything in
WebGLRenderingContext.

         synthesizeGLError(GL_INVALID_OPERATION, "compressedTexSubImage2D", "format does not match texture format");
         return;
     }