[RFC PATCH 2/7] qv4l2: fix black screen with opengl after capture

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Fixes the issue when the window was beeing resized/moved
and the frame image would become black.

Signed-off-by: Bård Eirik Winther <bwinther@xxxxxxxxx>
---
 utils/qv4l2/capture-win-gl.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/utils/qv4l2/capture-win-gl.cpp b/utils/qv4l2/capture-win-gl.cpp
index bae6569..edae60f 100644
--- a/utils/qv4l2/capture-win-gl.cpp
+++ b/utils/qv4l2/capture-win-gl.cpp
@@ -253,6 +253,12 @@ void CaptureWinGLEngine::paintGL()
 		changeShader();
 
 	if (m_frameData == NULL) {
+		glBegin(GL_QUADS);
+		glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0, 0);
+		glTexCoord2f(1.0f, 0.0f); glVertex2f(m_frameWidth, 0);
+		glTexCoord2f(1.0f, 1.0f); glVertex2f(m_frameWidth, m_frameHeight);
+		glTexCoord2f(0.0f, 1.0f); glVertex2f(0, m_frameHeight);
+		glEnd();
 		return;
 	}
 
-- 
1.8.3.2

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