Don't trigger Q_UNREACHABLE if passed invalid render buffer formats

Adds warning printout of the format that triggered the error. The
graphics card may produce a proper image, but readFrameBuffer doesn't
know how to interpret it. Additionally adds printout of the format when
the code doesn't know the equivalent OpenGL ES 2.0 format.

Fixes: QTBUG-66515
Change-Id: I65559f7d397a9297521ae0b1ebaf120629be3873
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/render/renderers/opengl/textures/gltexture.cpp b/src/render/renderers/opengl/textures/gltexture.cpp
index e98f3965d..cb83e9c1e 100644
--- a/src/render/renderers/opengl/textures/gltexture.cpp
+++ b/src/render/renderers/opengl/textures/gltexture.cpp
@@ -40,6 +40,7 @@
 #include <QtCore/qhash.h>
 #include "gltexture_p.h"
 
+#include <private/qdebug_p.h>
 #include <QDebug>
 #include <QOpenGLFunctions>
 #include <QOpenGLTexture>
@@ -383,7 +384,9 @@ QOpenGLTexture *GLTexture::buildGLTexture()
             format = QAbstractTexture::DepthFormat;
             break;
         default:
-            qWarning() << Q_FUNC_INFO << "could not find a matching OpenGL ES 2.0 unsized texture format";
+            auto warning = qWarning();
+            warning << "Could not find a matching OpenGL ES 2.0 texture format:";
+            QtDebugUtils::formatQEnum(warning, m_properties.format);
             break;
         }
     }