[Bug 796033] [i915 SNB] Totem window is all black in Wayland sessions

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796033

--- Comment #8 from Daniel van Vugt <daniel.van.vugt at canonical.com> ---
I wonder if this is the problem:

gstvaapiwindow_egl.c:

static const gchar *vert_shader_text =
    "#ifdef GL_ES                                      \n"
    "precision mediump float;                          \n"
...
static const gchar *frag_shader_text_rgba =
    "#ifdef GL_ES                                      \n"
    "precision mediump float;                          \n"

If mediump equates to 16-bit (half precision) floats on Intel, then those
shaders won't work on pre-Ivy Bridge CPUs.

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