uterm: video: modularize video backends

We want to allow dynamic backend loading during runtime so we need to
avoid static definitions. This converts the backend IDs into module
structures which are then linked into the binary.

To make this fully modular, we need to load the backends dynamicly via
dlsym() and move all the static declarations from uterm_video.h into the
backends. But for now at least the backends can be easily exchanged and
configured during compile-time.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: video: include xf86drm.h for drmAvailable()

We need this include so drmAvailable() is declared correctly.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: video: add data pointer

If we want to load backends during runtime, we must allow them to store
their data. Instead of hardcoding it, we now provide a "data" pointer so
they can store arbitrary data.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: fbdev: use video-data pointer

Instead of hardcoding fbdev data in the header, we now store all data in
the "data" pointer so we can be loaded during runtime.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: split fbdev module into different files

This is the first step towards a uterm-fbdev module. It splits the huge
video file into a video backend and a render backend. A monitor backend
will follow later when a full uterm module infrastructure is available.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: video: remove .blend and .blendv backends

We never implemented real blending and never hooked it up with the public
API. Hence, we can safely remove this. All functionality that was
available via .blend is now available via .fake_blendv.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: fbdev: set mode dimensions after activation

We do not set the dimensions correctly but always use 0/0. Fix this by
overwriting the values on mode creation.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: share drm_mode between dumb and drm backend

The dumb and drm backends use the same mode structure so share the code as
drm_shared module.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: share drm dpms code

drm and dumb backends use the same DPMS code so share it.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: share drm-display helpers

dumb and drm video backends share quite a lot of logic. Hence, move common
helpers into the drm-shared module and use it in both backends.

This also moves the uterm-display objects of both backends to use the data
member instead of static fields.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: drm: fix y-inversion bug

OpenGL uses an inverted y-axis by default. However, the old gbm-surface
layer didn't correctly map this. But with the conversion to gbm_surface
objects, we now have the correct OpenGL framebuffers so we have to invert
the y-axis.
This was already fixed for the gltex renderer earlier but we forgot to fix
the uterm-drm blitting backend.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: share drm-video objects

This moves the gbm/drm shared properties into the drm-shared helper.
Furthermore, it removes the last static property in uterm_video objects so
everything is correctly accessed via ->data pointers.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: drm: fix y-invert bug

This fixes the last OpenGL user that still uses the wrong y-axis
direction. See the gltex helpers for more information.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: share drm-video wakeup helpers

The dumb and drm backends still use the same code to perform wakeup/sleep
code. Hence, move it into the drm-shared file so we can use the same
helpers for both.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: video: share set_dpms code

The set_dpms callback of dumb and drm backends is identical so share it in
drm-shared module.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: video: use shl_dlist for linked lists

uterm-video is actually older than shl_dlist and it used its own
single-linked lists until now. This had several drawbacks and produced
ugly code.

This commit converts all uterm-video elements to use shl_dlist and
introduces _bind and _unbind helpers.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
tests: fix build with new uterm headers

These tests still use uterm.h which builds fine if you have an old uterm
version installed, however, with a new version this will fail horribly.
Hence, fix them to use the new headers.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: remove uterm_video_use()

This function is a no-op and not used. Hence, remove it.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
uterm: drm: reread dpms state on wakeup

Other DRM users might change the DPMS state of a display while we are
asleep. Therefore, reread the state during wakeup and force DPMS to the
same value it had when we left. But do this only for displays that are
online, other displays are never touched by uterm-video.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
shl: hook: add helpers to add callbacks only once

Very often we want to avoid adding callbacks multiple times. Currently we
have to keep track of this in each module with a boolean value.
To simplify this procedure, we add helpers that guarantee that entries are
only added once and a helper to remove all entries with a given cb+data
combination.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>