Commit graph

18 commits

Author SHA1 Message Date
Lubosz Sarnecki
80d77aa0a5 gltransformation: implement pivot point for rotation and scale
https://bugzilla.gnome.org/show_bug.cgi?id=744763

Add a pivot vector for setting the origin of rotations and scales.

With the pivot point the rotation and scale operations can have
different origins. This adds the ability to rotate around different points.
Currently the default (0, 0) pivot point is possible,
a rotation around the center, and zooming into and out of the center.

With an pivot point this is optional.
I defined the following image coordinates for the pivot point:

	 (-1,1) ------------------------- (1,1)
		|			|
		|			|
		|			|
		|	  (0,0)		|
		|			|
		|			|
		|			|
	(-1,-1) ------------------------- (1,-1)

Example:

	Rotate the video at the bottom left corner

	gst-launch-1.0 videotestsrc \
			! gltransformation \
		 		scale-x=0.5 \
				scale-y=0.5 \
				rotation-z=25.0 \
				pivot-x=-1.0 \
				pivot-y=-1.0 \
			! glimagesink

The pivot-z option defines the pivot point in 3D space.
This only affects rotation, since we have no Z data to scale.
With this option a video can be rotated around a point in 3D space.

Example:

	Rotate around point behind the video:

    	gst-launch-1.0 videotestsrc \
			! gltransformation \
				rotation-x=10.0 \
				pivot-z=-4.0 \
			! glimagesink
2015-08-08 16:32:53 -04:00
Matthew Waters
2b9dddbafe gltransformation: correct vao usage
keep the vao bound after uploading the new vertex data

fixes a mesa GL error "no vertex array object bound" on caps changes
2015-07-07 15:32:13 +10:00
Matthew Waters
9dcefacb3d gltransformation: fix DrawElements call for element array buffers
https://bugzilla.gnome.org/show_bug.cgi?id=749734
2015-05-25 17:39:08 +10:00
Matthew Waters
7f7a9dd3ec gl: element buffers are part of vao state
Use them as such.  They are also required for GL3 core profile support
with glDrawElements on OS X.
2015-05-14 14:58:07 +10:00
Matthieu Bouron
c6ec145a95 gltransformation: Unref shader in ::stop() 2015-04-27 10:16:24 +02:00
Sebastian Dröge
e7aa25ca6f glfilter: De-camelcase onInitFBO() vfunc 2015-04-26 21:42:03 +02:00
Lubosz Sarnecki
51daa8b9e2 gltransformation: don't initialize multiple shaders on renegotiation
https://bugzilla.gnome.org/show_bug.cgi?id=748407

* delete shader if one exists
* set it to NULL after unrefing
2015-04-26 21:23:16 +02:00
Lubosz Sarnecki
5c07218bd2 gltransformation: fix shader memory leak 2015-04-21 16:37:17 +10:00
Matthew Waters
34485c9976 gl: get the context from basemixer/basefilter 2015-03-13 12:30:20 +00:00
Xavier Claessens
128c2a141a gltransformation: normalize translations
https://bugzilla.gnome.org/show_bug.cgi?id=744763

* Lubosz: use maxfloat for transformation range
2015-03-03 14:05:21 -05:00
Xavier Claessens
80f97eaee7 gltransformation: Fix doc typo
https://bugzilla.gnome.org/show_bug.cgi?id=744763
2015-03-03 14:05:21 -05:00
Nicolas Dufresne
4ea15b1b3f gltransform: Fix includes of graphene headers
The graphene-1.0 part should not be in the source code. This directory
is part of the cflags include. This is similar to gstreamer-1.0/
directory. This break compilation if the include directory where
graphene is installed is not in your include path.
2015-02-18 17:15:01 -05:00
Matthew Waters
f021549294 gl: fixup vao and vbo usage for legacy GL 2014-12-11 19:41:23 +11:00
Matthew Waters
3c1e77eb31 gldisplay: implement runtime GL api filtering
Needed so that the pipeline/application can limit the choice of GL api
to what it supports
2014-11-28 09:14:26 +11:00
Matthew Waters
3772c83f94 gltransformation: support gl3 2014-11-28 09:14:25 +11:00
Lubosz Sarnecki
04034b11f4 gltransformation: graphene multiplication order has changed
https://bugzilla.gnome.org/show_bug.cgi?id=733510
2014-09-30 22:11:35 +10:00
Lubosz Sarnecki
f1b026c480 gltransformation: fix issues and expose mvp matrix
* aspect should not be 0 on init
* rename fovy to fov
* add mvp to properties as boxed graphene type
* fix transformation order. scale first
* clear color with 1.0 alpha

https://bugzilla.gnome.org/show_bug.cgi?id=734223
2014-09-05 09:39:34 +10:00
Lubosz Sarnecki
053252ccc6 opengl: add element for transforming video geometry
* add graphene as soft dependency for linear algebra
2014-06-18 20:41:03 +10:00