eglfs: Detect llvmpipe and show a warning

Do ourselves and our users a favor by pointing out why Qt (Quick)
apps perform horribly on commonly used distros on the RPi. Using
a software rasterizer on such boards is not going to cut it.

Task-number: QTBUG-50533
Change-Id: I087f502ddb9c6bdde84343e6abd85c87cdc474f0
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext.cpp b/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
index acd6197ed5..f5ba587293 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext.cpp
@@ -275,6 +275,12 @@ void QEGLPlatformContext::destroyTemporaryOffscreenSurface(EGLSurface surface)
     eglDestroySurface(m_eglDisplay, surface);
 }
 
+void QEGLPlatformContext::runGLChecks()
+{
+    // Nothing to do here, subclasses may override in order to perform OpenGL
+    // queries needing a context.
+}
+
 void QEGLPlatformContext::updateFormatFromGL()
 {
 #ifndef QT_NO_OPENGL
@@ -346,6 +352,7 @@ void QEGLPlatformContext::updateFormatFromGL()
                 }
             }
         }
+        runGLChecks();
         eglMakeCurrent(prevDisplay, prevSurfaceDraw, prevSurfaceRead, prevContext);
     } else {
         qWarning("QEGLPlatformContext: Failed to make temporary surface current, format not updated (%x)", eglGetError());
diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
index 2fa465556b..41601272a3 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
@@ -84,6 +84,7 @@ protected:
     virtual EGLSurface eglSurfaceForPlatformSurface(QPlatformSurface *surface) = 0;
     virtual EGLSurface createTemporaryOffscreenSurface();
     virtual void destroyTemporaryOffscreenSurface(EGLSurface surface);
+    virtual void runGLChecks();
 
 private:
     void init(const QSurfaceFormat &format, QPlatformOpenGLContext *share);