Fix assert error triggered in D3D11 path when we redefine textures to GL_NONE.

src/libGLESv2/Texture.cpp

@@ -436,7 +436,7 @@ void Texture2D::releaseTexImage()
 
         for (int i = 0; i < IMPLEMENTATION_MAX_TEXTURE_LEVELS; i++)
         {
-            mImageArray[i]->redefine(mRenderer, GL_RGBA8_OES, 0, 0, true);
+            mImageArray[i]->redefine(mRenderer, GL_NONE, 0, 0, true);
         }
     }
 }

src/libGLESv2/renderer/renderer11_utils.cpp

@@ -283,6 +283,8 @@ GLenum ConvertTextureInternalFormat(DXGI_FORMAT format)
         return GL_RG16F_EXT;
       case DXGI_FORMAT_D24_UNORM_S8_UINT:
         return GL_DEPTH24_STENCIL8_OES;
+      case DXGI_FORMAT_UNKNOWN:
+        return GL_NONE;
       default:
         UNREACHABLE();
     }
@@ -364,6 +366,8 @@ DXGI_FORMAT ConvertTextureFormat(GLenum internalformat)
       case GL_DEPTH_COMPONENT32_OES:
       case GL_DEPTH24_STENCIL8_OES:
         return DXGI_FORMAT_D24_UNORM_S8_UINT;
+      case GL_NONE:
+        return DXGI_FORMAT_UNKNOWN;
       default:
         UNREACHABLE();
     }