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6a58c684a7
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
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
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* GStreamer
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* Copyright (C) 2014 Lubosz Sarnecki <lubosz@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _GST_GL_TRANSFORMATION_H_
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#define _GST_GL_TRANSFORMATION_H_
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#include <gst/gl/gstglfilter.h>
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#include <graphene.h>
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G_BEGIN_DECLS
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#define GST_TYPE_GL_TRANSFORMATION (gst_gl_transformation_get_type())
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#define GST_GL_TRANSFORMATION(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_TRANSFORMATION,GstGLTransformation))
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#define GST_IS_GL_TRANSFORMATION(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_TRANSFORMATION))
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#define GST_GL_TRANSFORMATION_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_GL_TRANSFORMATION,GstGLTransformationClass))
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#define GST_IS_GL_TRANSFORMATION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_GL_TRANSFORMATION))
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#define GST_GL_TRANSFORMATION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_GL_TRANSFORMATION,GstGLTransformationClass))
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typedef struct _GstGLTransformation GstGLTransformation;
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typedef struct _GstGLTransformationClass GstGLTransformationClass;
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struct _GstGLTransformation
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{
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GstGLFilter filter;
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GstGLShader *shader;
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GLuint vao;
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GLuint vbo_indices;
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GLuint vertex_buffer;
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GLint attr_position;
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GLint attr_texture;
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guint in_tex;
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gfloat xrotation;
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gfloat yrotation;
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gfloat zrotation;
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gfloat xscale;
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gfloat yscale;
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gfloat xtranslation;
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gfloat ytranslation;
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gfloat ztranslation;
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gfloat xpivot;
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gfloat ypivot;
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gfloat zpivot;
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/* perspective */
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gfloat fov;
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gfloat aspect;
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gfloat znear;
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gfloat zfar;
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gboolean ortho;
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graphene_matrix_t mvp_matrix;
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gboolean caps_change;
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};
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struct _GstGLTransformationClass
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{
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GstGLFilterClass filter_class;
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};
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GType gst_gl_transformation_get_type (void);
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G_END_DECLS
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#endif /* _GST_GL_TRANSFORMATION_H_ */
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