blob: 538f96e79cb86be65161c3bb67c448d763959e36 [file] [log] [blame]
/*
* GStreamer
* Copyright (C) 2008-2010 Filippo Argiolas <filippo.argiolas@gmail.com>
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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.
*/
/**
* SECTION:element-glfiltersobel.
*
* Sobel Edge Detection.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch videotestsrc ! glupload ! glfiltersobel ! glimagesink
* ]|
* FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstglfiltersobel.h"
#include "effects/gstgleffectssources.h"
enum
{
PROP_0,
PROP_INVERT
};
#define GST_CAT_DEFAULT gst_gl_filtersobel_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_filtersobel_debug, "glfiltersobel", 0, "glfiltersobel element");
G_DEFINE_TYPE_WITH_CODE (GstGLFilterSobel, gst_gl_filtersobel,
GST_TYPE_GL_FILTER, DEBUG_INIT);
static void gst_gl_filtersobel_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_filtersobel_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_gl_filter_filtersobel_reset (GstGLFilter * filter);
static gboolean gst_gl_filtersobel_init_shader (GstGLFilter * filter);
static gboolean gst_gl_filtersobel_filter_texture (GstGLFilter * filter,
guint in_tex, guint out_tex);
static void gst_gl_filtersobel_length (gint width, gint height, guint texture,
gpointer stuff);
static void
gst_gl_filtersobel_init_resources (GstGLFilter * filter)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (filter);
GstGLFuncs *gl = filter->context->gl_vtable;
int i;
for (i = 0; i < 2; i++) {
gl->GenTextures (1, &filtersobel->midtexture[i]);
gl->BindTexture (GL_TEXTURE_2D, filtersobel->midtexture[i]);
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8,
GST_VIDEO_INFO_WIDTH (&filter->out_info),
GST_VIDEO_INFO_HEIGHT (&filter->out_info),
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
}
static void
gst_gl_filtersobel_reset_resources (GstGLFilter * filter)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (filter);
GstGLFuncs *gl = filter->context->gl_vtable;
int i;
for (i = 0; i < 2; i++) {
gl->DeleteTextures (1, &filtersobel->midtexture[i]);
}
}
static void
gst_gl_filtersobel_class_init (GstGLFilterSobelClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_gl_filtersobel_set_property;
gobject_class->get_property = gst_gl_filtersobel_get_property;
GST_GL_FILTER_CLASS (klass)->filter_texture =
gst_gl_filtersobel_filter_texture;
GST_GL_FILTER_CLASS (klass)->display_init_cb =
gst_gl_filtersobel_init_resources;
GST_GL_FILTER_CLASS (klass)->display_reset_cb =
gst_gl_filtersobel_reset_resources;
GST_GL_FILTER_CLASS (klass)->onInitFBO = gst_gl_filtersobel_init_shader;
GST_GL_FILTER_CLASS (klass)->onReset = gst_gl_filter_filtersobel_reset;
g_object_class_install_property (gobject_class,
PROP_INVERT,
g_param_spec_boolean ("invert",
"Invert the colors",
"Invert colors to get dark edges on bright background",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class,
"Gstreamer OpenGL Sobel", "Filter/Effect/Video", "Sobel edge detection",
"Filippo Argiolas <filippo.argiolas@gmail.com>");
}
static void
gst_gl_filtersobel_init (GstGLFilterSobel * filtersobel)
{
int i;
filtersobel->hconv = NULL;
filtersobel->vconv = NULL;
filtersobel->invert = FALSE;
for (i = 0; i < 2; i++) {
filtersobel->midtexture[i] = 0;
}
}
static void
gst_gl_filter_filtersobel_reset (GstGLFilter * filter)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (filter);
//blocking call, wait the opengl thread has destroyed the shader
if (filtersobel->desat)
gst_gl_context_del_shader (filter->context, filtersobel->desat);
filtersobel->desat = NULL;
if (filtersobel->hconv)
gst_gl_context_del_shader (filter->context, filtersobel->hconv);
filtersobel->hconv = NULL;
if (filtersobel->vconv)
gst_gl_context_del_shader (filter->context, filtersobel->vconv);
filtersobel->vconv = NULL;
if (filtersobel->len)
gst_gl_context_del_shader (filter->context, filtersobel->len);
filtersobel->len = NULL;
}
static void
gst_gl_filtersobel_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (object);
switch (prop_id) {
case PROP_INVERT:
filtersobel->invert = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_gl_filtersobel_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (object);
switch (prop_id) {
case PROP_INVERT:
g_value_set_boolean (value, filtersobel->invert);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_filtersobel_init_shader (GstGLFilter * filter)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (filter);
gboolean ret = TRUE;
//blocking call, wait the opengl thread has compiled the shader
ret =
gst_gl_context_gen_shader (filter->context, 0, desaturate_fragment_source,
&filtersobel->desat);
ret &=
gst_gl_context_gen_shader (filter->context, 0,
sep_sobel_hconv3_fragment_source, &filtersobel->hconv);
ret &=
gst_gl_context_gen_shader (filter->context, 0,
sep_sobel_vconv3_fragment_source, &filtersobel->vconv);
ret &=
gst_gl_context_gen_shader (filter->context, 0,
sep_sobel_length_fragment_source, &filtersobel->len);
return ret;
}
static gboolean
gst_gl_filtersobel_filter_texture (GstGLFilter * filter, guint in_tex,
guint out_tex)
{
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (filter);
gst_gl_filter_render_to_target_with_shader (filter, TRUE, in_tex,
filtersobel->midtexture[0], filtersobel->desat);
gst_gl_filter_render_to_target_with_shader (filter, FALSE,
filtersobel->midtexture[0], filtersobel->midtexture[1],
filtersobel->hconv);
gst_gl_filter_render_to_target_with_shader (filter, FALSE,
filtersobel->midtexture[1], filtersobel->midtexture[0],
filtersobel->vconv);
gst_gl_filter_render_to_target (filter, FALSE, filtersobel->midtexture[0],
out_tex, gst_gl_filtersobel_length, filtersobel);
return TRUE;
}
static void
gst_gl_filtersobel_length (gint width, gint height, guint texture,
gpointer stuff)
{
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLFuncs *gl = filter->context->gl_vtable;
GstGLFilterSobel *filtersobel = GST_GL_FILTERSOBEL (filter);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gst_gl_shader_use (filtersobel->len);
gl->ActiveTexture (GL_TEXTURE1);
gl->Enable (GL_TEXTURE_2D);
gl->BindTexture (GL_TEXTURE_2D, texture);
gl->Disable (GL_TEXTURE_2D);
gst_gl_shader_set_uniform_1i (filtersobel->len, "tex", 1);
gst_gl_shader_set_uniform_1i (filtersobel->len, "invert",
filtersobel->invert);
gst_gl_filter_draw_texture (filter, texture, width, height);
}