message: Disable debug/pixel history buttons when they cannot be used
diff: @@ -478,6 +478,10 @@ void TextureViewer::UI_UpdateCachedTexture()
  id = m_TexDisplay.resourceId;
  m_CachedTexture = m_Ctx.GetTexture(id);
  +
  + ui->debugPixelContext->setEnabled(m_Ctx.CurPipelineState().IsCaptureD3D11() &&
  + m_CachedTexture != NULL);
  + ui->pixelHistory->setEnabled(m_Ctx.CurPipelineState().IsCaptureD3D11() && m_CachedTexture != NULL);
  }
  TextureViewer::TextureViewer(ICaptureContext &ctx, QWidget *parent)
  