Add initial GL direct rendering test.
Fix viewport when rendering to FBO.
Add get_proc_address.

Render something "real" in GL.
Render something in motion.
Handle GL state more carefully.
Merge branch 'master' into gl-render
Fix some possible segfaults with HW render.
Test GL core works in GLES as well.
win32: add overlay to d3d9
win32: specify vertex declaration for overlay
win32: add opacity shader to overlay
win32: fix compile without HAVE_OVERLAY
win32: adjust makefile
style
Fix Win32 HW render.
Add depth/stencil buffers to HW GL.
Merge branch 'master' into gl-render
win32: use color in d3d stock shader, pass valid color values
win32: use stock shader and color for overlay opacity
style