egl: fix incorrect #ifdef guarding of features

We have an #ifdef EGL_WL_bind_wayland_display guard in
cogl-winsys-egl-feature-functions.h to avoid referencing wayland types
when the EGL header doesn't know about them, but somehow this guard also
ended up around the KHR_create_context and EXT_buffer age features too
even though they aren't wayland specific.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
glx-feature-functions: update misleading comment

Reviewed-by: Neil Roberts <neil@linux.intel.com>
Expose COGL_FEATURE_ID_BUFFER_AGE feature id

This adds a new COGL_FEATURE_ID_BUFFER_AGE feature id that can be used
to determine if cogl_onscreen_get_buffer_age() will ever return an age
other than 0. This should be used instead of querying the winsys feature
via cogl_clutter_winsys_has_feature().

Reviewed-by: Neil Roberts <neil@linux.intel.com>
cogl-gst: allocate textures synchronously

This makes sure video textures being uploaded via
video_texture_new_from_data are allocated before the function returns.
This function create a CoglBitmap to wrap the data from gstreamer and by
allowing cogl to allocate the texture lazily it's possible that the data
being pointed to by the bitmap won't remain valid until we actually come
to allocate the texture.

Note: we don't simply use cogl_texture_2d_[sliced_]new_from_data() here
because we need to be able to call cogl_texture_set_premultiplied()
before allocating the texture.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
basic-video-player: don't try and sample mipmap

Since we don't generate a mipmap chain for uploaded video frames this
avoids setting the min filter to COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR.

Since COGL_PIPELINE_FILTER_LINEAR is the default and since it is also
dubious that cogl-basic-video-player is directly manipulating layers
that are conceptually internal to cogl-gst this removes the loop that
updates the filtering for cogl-gst layers.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
cogl-gst: add cogl_gst_video_sink_get_natural_size() api

This adds api for querying a "natural" width and height for a video
which has the correct aspect ratio for displaying on square, 1:1 pixels.

The natural size is the minimum size where downscaling is not required.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
sdl2: fix GL driver selection

SDL2 supports selecting between full OpenGL or OpenGL ES 1/2 but our
selection code was written before SDL 2.0 was officially released and
since then a new SDL_GL_CONTEXT_PROFILE_MASK attribute was added and
we have to explicitly set the SDL_GL_CONTEXT_MINOR_VERSION attribute.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
egl: remove NativeWindowType/NativeDisplayType defines

This ensures we use EGLNativeWindowType and EGLNativeDisplayType
everywhere instead. The previous names come from EGL 1.2 but it seems
reasonable to require more recent EGL versions. If someone wanted to add
compatibility for EGL 1.2 later it would be straightforward to define
the new names to the old.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
move GLeglImageOES define into cogl-egl-private.h

This splits out the GLeglImageOES define in cogl-egl.h into a private
cogl-egl-private.h header and updates the guards in cogl-egl.h to be
consistent with other top-level headers where we need to be careful
about how __COGL_H_INSIDE__ is defined and undefined, esp when the
gobject introspection scanner is running.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
Expose EGL context/display and GLX context

To help facilitate integration with third party frameworks this exposes
the EGL context and display to applications as well as the GLX context.
(Note that the GLX display is already available via
cogl_xlib_renderer_get_display())

This adds a new top-level <cogl/cogl-glx.h> header that needs to be
included explicitly to access the glx specific api.

Anyone using these apis will be responsible for checking that Cogl
is indeed using EGL or GLX by calling cogl_renderer_get_winsys_id()

This will enable GStreamer, for example, to be able to create a GL
context that shares resources with Cogl's context.

https://bugzilla.gnome.org/show_bug.cgi?id=724992

Reviewed-by: Neil Roberts <neil@linux.intel.com>