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