diff options
| -rw-r--r-- | vcl/unx/gtk3/gtkinst.cxx | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/vcl/unx/gtk3/gtkinst.cxx b/vcl/unx/gtk3/gtkinst.cxx index 38f8d3c3d7d2..12ded5210ef0 100644 --- a/vcl/unx/gtk3/gtkinst.cxx +++ b/vcl/unx/gtk3/gtkinst.cxx @@ -1952,8 +1952,53 @@ private: glViewport(0, 0, width, height); } + // Use a throw away toplevel to determine the OpenGL version because once + // an GdkGLContext is created for a window then it seems that + // glGenVertexArrays will always be called when the window gets rendered. + static int GetOpenGLVersion() + { + int nMajorGLVersion(0); + + GtkWidget* pWindow; +#if !GTK_CHECK_VERSION(4,0,0) + pWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL); +#else + pWindow = gtk_window_new(); +#endif + + gtk_widget_realize(pWindow); + + if (GdkSurface* pSurface = widget_get_surface(pWindow)) + { + if (GdkGLContext* pContext = surface_create_gl_context(pSurface)) + { + if (gdk_gl_context_realize(pContext, nullptr)) + { + gdk_gl_context_make_current(pContext); + gdk_gl_context_get_version(pContext, &nMajorGLVersion, nullptr); + gdk_gl_context_clear_current(); + } + g_object_unref(pContext); + } + } + +#if !GTK_CHECK_VERSION(4,0,0) + gtk_widget_destroy(pWindow); +#else + gtk_window_destroy(GTK_WINDOW(pWindow)); +#endif + return nMajorGLVersion; + } + virtual bool ImplInit() override { + static int nOpenGLVersion = GetOpenGLVersion(); + if (nOpenGLVersion < 3) + { + SAL_WARN("vcl.gtk", "gtk GL requires glGenVertexArrays which is OpenGL 3, while system provides: " << nOpenGLVersion); + return false; + } + const SystemEnvData* pEnvData = m_pChildWindow->GetSystemData(); GtkWidget *pParent = static_cast<GtkWidget*>(pEnvData->pWidget); m_pGLArea = gtk_gl_area_new(); |