Add a helper method to return the native format backing a GL texture type.

TRAC #23844

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
diff --git a/src/libGLESv2/renderer/d3d11/Renderer11.cpp b/src/libGLESv2/renderer/d3d11/Renderer11.cpp
index 8d2b32d..8721333 100644
--- a/src/libGLESv2/renderer/d3d11/Renderer11.cpp
+++ b/src/libGLESv2/renderer/d3d11/Renderer11.cpp
@@ -3338,6 +3338,12 @@
     return true;
 }
 
+GLint Renderer11::getNativeTextureFormat(GLint internalFormat) const
+{
+    int clientVersion = getCurrentClientVersion();
+    return d3d11_gl::GetInternalFormat(gl_d3d11::GetTexFormat(internalFormat, clientVersion), clientVersion);
+}
+
 Renderer11::MultisampleSupportInfo Renderer11::getMultisampleSupportInfo(DXGI_FORMAT format)
 {
     MultisampleSupportInfo supportInfo = { 0 };