Introduce QOpenGLTexture::target()

To extract the target of a given texture object. Somehow this
accessor was missing.

Change-Id: Ie43366bed3627a20204600e68e426b55abf37af6
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

src/gui/opengl/qopengltexture.cpp

@@ -1482,6 +1482,17 @@ QOpenGLTexture::~QOpenGLTexture()
 {
 }
 
+/*!
+    Returns the binding target of this texture.
+
+    \since 5.4
+*/
+QOpenGLTexture::Target QOpenGLTexture::target() const
+{
+    Q_D(const QOpenGLTexture);
+    return d->target;
+}
+
 /*!
     Creates the underlying OpenGL texture object. This requires a current valid
     OpenGL context. If the texture object already exists, this function does

src/gui/opengl/qopengltexture.h

@@ -100,6 +100,8 @@ public:
     explicit QOpenGLTexture(const QImage& image, MipMapGeneration genMipMaps = GenerateMipMaps);
     ~QOpenGLTexture();
 
+    Target target() const;
+
     // Creation and destruction
     bool create();
     void destroy();