spicec: use doublebuffer for opengl

This visually reduces glitches without noticeable speed difference.

It's also the traditionnal way of doing opengl.

1 files changed, 12 insertions, 0 deletions

diff --git a/client/x11/red_window.cpp b/client/x11/red_window.cpp
index 83144a54..b6e11e14 100644
--- a/client/x11/red_window.cpp
+++ b/client/x11/red_window.cpp
@@ -2122,6 +2122,18 @@ void RedWindow::untouch_context()
     glXMakeCurrent(x_display, 0, 0);
 }
 
+void RedWindow::swap_gl()
+{
+    PixelsSource_p *pix_source = (PixelsSource_p*)get_opaque();
+    RedGlContext context = pix_source->x_drawable.context;
+
+    if (!context)
+        return;
+
+    glXMakeCurrent(x_display, get_window(), context);
+    glXSwapBuffers(x_display, get_window());
+}
+
 void RedWindow::set_type_gl()
 {
     PixelsSource_p *pix_source = (PixelsSource_p*)get_opaque();