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* GStreamer
* Copyright (C) 2007 David Schleef <>
* Copyright (C) 2008 Julien Isorce <>
* Copyright (C) 2008 Filippo Argiolas <>
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
#ifndef _GST_GL_FILTER_H_
#define _GST_GL_FILTER_H_
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/video/video.h>
#include <gst/gl/gl.h>
GType gst_gl_filter_get_type(void);
#define GST_TYPE_GL_FILTER (gst_gl_filter_get_type())
typedef struct _GstGLFilter GstGLFilter;
typedef struct _GstGLFilterClass GstGLFilterClass;
* GstGLFilter:
* @base_transform: parent #GstBaseTransform
* @pool: the currently configured #GstBufferPool
* @display: the currently configured #GstGLDisplay
* @in_info: the video info for input buffers
* @out_info: the video info for output buffers
* @fbo: GL Framebuffer object used for transformations
* @depthbuffer: GL renderbuffer attached to @fbo
* @upload: the object used for uploading data, if needed
* @download: the object used for downloading data, if needed
* #GstGLFilter is a base class that provides the logic of getting the GL context
* from downstream and automatic upload/download for non-#GstGLMemory
* #GstBuffer<!-- -->s.
struct _GstGLFilter
GstBaseTransform base_transform;
GstBufferPool *pool;
GstGLDisplay *display;
GstVideoInfo in_info;
GstVideoInfo out_info;
GLuint fbo;
GLuint depthbuffer;
GstGLUpload *upload;
GstGLDownload *download;
/* <private> */
GLuint in_tex_id;
GLuint out_tex_id;
GstGLShader *default_shader;
GstGLContext *context;
GstGLContext *other_context;
GLint draw_attr_position_loc;
GLint draw_attr_texture_loc;
* GstGLFilterClass:
* @base_transform_class: parent class
* @set_caps: mirror from #GstBaseTransform
* @filter: perform operations on the input and output buffers. In general,
* you should avoid using this method if at all possible. One valid
* use-case for using this is keeping previous buffers for future calculations.
* Note: If @filter exists, then @filter_texture is not run
* @filter_texture: given @in_tex, transform it into @out_tex. Not used
* if @filter exists
* @onInitFBO: perform initialization when the Framebuffer object is created
* @onStart: called when element activates see also #GstBaseTransform
* @onStop: called when the element deactivates e also #GstBaseTransform
* @onReset: called on inizialation and after @onStop
* @display_init_cb: execute arbitrary gl code on start
* @display_reset_cb: execute arbitrary gl code at stop
struct _GstGLFilterClass
GstBaseTransformClass base_transform_class;
gboolean (*set_caps) (GstGLFilter* filter, GstCaps* incaps, GstCaps* outcaps);
gboolean (*filter) (GstGLFilter *filter, GstBuffer *inbuf, GstBuffer *outbuf);
gboolean (*filter_texture) (GstGLFilter *filter, guint in_tex, guint out_tex);
gboolean (*onInitFBO) (GstGLFilter *filter);
void (*onStart) (GstGLFilter *filter);
void (*onStop) (GstGLFilter *filter);
void (*onReset) (GstGLFilter *filter);
/* useful to init and cleanup custom gl resources */
void (*display_init_cb) (GstGLFilter *filter);
void (*display_reset_cb) (GstGLFilter *filter);
gboolean gst_gl_filter_filter_texture (GstGLFilter * filter, GstBuffer * inbuf,
GstBuffer * outbuf);
void gst_gl_filter_render_to_target (GstGLFilter *filter, gboolean resize, GLuint input,
GLuint target, GLCB func, gpointer data);
void gst_gl_filter_render_to_target_with_shader (GstGLFilter * filter, gboolean resize,
GLuint input, GLuint target, GstGLShader *shader);
void gst_gl_filter_draw_texture (GstGLFilter *filter, GLuint texture, guint width, guint height);
#endif /* _GST_GL_FILTER_H_ */