fdo#81055: Crash due to inadequate checks for GL version / capabilities

Base line is OpenGL 2.1 + extensions:

GL_ARB_framebuffer_object (part of OpenGL 3.0) for
glGenFramebuffers, glGenRenderbuffers...

GL_ARB_vertex_array_object (part of OpenGL 3.0) for
glGenVertexArrays, glBindVertexArray...

GL_ARB_sampler_objects (part of OpenGL 3.3) for
glGenSamplers, glBindSampler...

Change-Id: Ib8acf41ab85cd1677d0341719b3a5b4f743ed756

avmedia/source/opengl/oglplayer.cxx

@@ -239,6 +239,25 @@ awt::Size SAL_CALL OGLPlayer::getPreferredPlayerWindowSize() throw ( uno::Runtim
     return awt::Size( 480, 360 );
 }
 
+static bool lcl_CheckOpenGLRequirements()
+{
+    float fVersion = OpenGLHelper::getGLVersion();
+    if( fVersion >= 3.3 )
+    {
+        return true;
+    }
+    else if( fVersion >= 3.0 )
+    {
+        return glewIsSupported("GL_ARB_sampler_objects");
+    }
+    else if( fVersion >= 2.1 )
+    {
+        return glewIsSupported("GL_ARB_sampler_objects GL_ARB_framebuffer_object GL_ARB_vertex_array_object");
+    }
+
+    return false;
+}
+
 uno::Reference< media::XPlayerWindow > SAL_CALL OGLPlayer::createPlayerWindow( const uno::Sequence< uno::Any >& rArguments )
      throw ( uno::RuntimeException, std::exception )
 {
@@ -264,6 +283,12 @@ uno::Reference< media::XPlayerWindow > SAL_CALL OGLPlayer::createPlayerWindow( c
         return uno::Reference< media::XPlayerWindow >();
     }
 
+    if( !lcl_CheckOpenGLRequirements() )
+    {
+        SAL_WARN("avmedia.opengl", "Your platform does not have the minimal OpenGL requiremenets!");
+        return uno::Reference< media::XPlayerWindow >();
+    }
+
     Size aSize = pChildWindow->GetSizePixel();
     m_aContext.setWinSize(aSize);
     m_pHandle->viewport.x = 0;
@@ -298,6 +323,12 @@ uno::Reference< media::XFrameGrabber > SAL_CALL OGLPlayer::createFrameGrabber()
         return uno::Reference< media::XFrameGrabber >();
     }
 
+    if( !lcl_CheckOpenGLRequirements() )
+    {
+        SAL_WARN("avmedia.opengl", "Your platform does not have the minimal OpenGL requiremenets!");
+        return uno::Reference< media::XFrameGrabber >();
+    }
+
     m_pHandle->viewport.x = 0;
     m_pHandle->viewport.y = 0;
     m_pHandle->viewport.width = getPreferredPlayerWindowSize().Width;