/* * GStreamer * Copyright (C) 2008-2010 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 * 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. * * * Examples * |[ * gst-launch videotestsrc ! glupload ! glfiltersobel ! glimagesink * ]| * FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required. * */ #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 "); } 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); }