Avoid transparency in qopenglwindow example

On systems that give alpha configs by default writing alpha values of
less than 1.0 is a bad idea since it will lead to the content behind the
window becoming visible, even though this is not the example's intention.

Change-Id: I23cdfc1fb78d77b1cbc192d2aba5d6665a7acfcc
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

2 files changed, 3 insertions, 2 deletions

diff --git a/examples/opengl/qopenglwindow/background.frag b/examples/opengl/qopenglwindow/background.frag
index 3d9914e64b..572c941f08 100644
--- a/examples/opengl/qopenglwindow/background.frag
+++ b/examples/opengl/qopenglwindow/background.frag
@@ -20,5 +20,6 @@ void main()
 {
     highp float coordNoise = noise(gl_FragCoord.xy);
     highp float proximity = smoothstep(0.5, 1.0, (curv() + 1.0) * (coordNoise ));
-    gl_FragColor = vec4(coordNoise, coordNoise, coordNoise, 1.0) * proximity;
+    highp vec3 color = vec3(coordNoise) * proximity;
+    gl_FragColor = vec4(color, 1.0);
 }
diff --git a/examples/opengl/qopenglwindow/background_renderer.cpp b/examples/opengl/qopenglwindow/background_renderer.cpp
index 4c377e1437..2c830ac13c 100644
--- a/examples/opengl/qopenglwindow/background_renderer.cpp
+++ b/examples/opengl/qopenglwindow/background_renderer.cpp
@@ -89,7 +89,7 @@ void FragmentToy::draw(const QSize &windowSize)
     glDisable(GL_STENCIL_TEST);
     glDisable(GL_DEPTH_TEST);
 
-    glClearColor(0,0,0,0);
+    glClearColor(0, 0, 0, 1);
     glClear(GL_COLOR_BUFFER_BIT);
     if (!m_vao.isCreated())
         m_vao.create();