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257 lines
8.1 KiB
C
257 lines
8.1 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 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-glfilterblur
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*
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* Blur with 9x9 separable convolution.
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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 ! glfilterblur ! 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 "gstglfilterblur.h"
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#include "effects/gstgleffectssources.h"
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#define GST_CAT_DEFAULT gst_gl_filterblur_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_filterblur_debug, "glfilterblur", 0, "glfilterblur element");
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G_DEFINE_TYPE_WITH_CODE (GstGLFilterBlur, gst_gl_filterblur,
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GST_TYPE_GL_FILTER, DEBUG_INIT);
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static void gst_gl_filterblur_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_gl_filterblur_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_gl_filter_filterblur_reset (GstGLFilter * filter);
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static gboolean gst_gl_filterblur_init_shader (GstGLFilter * filter);
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static gboolean gst_gl_filterblur_filter_texture (GstGLFilter * filter,
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guint in_tex, guint out_tex);
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static void gst_gl_filterblur_hcallback (gint width, gint height, guint texture,
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gpointer stuff);
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static void gst_gl_filterblur_vcallback (gint width, gint height, guint texture,
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gpointer stuff);
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static void
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gst_gl_filterblur_init_resources (GstGLFilter * filter)
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{
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GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (filter);
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GstGLFuncs *gl = filter->context->gl_vtable;
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gl->GenTextures (1, &filterblur->midtexture);
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gl->BindTexture (GL_TEXTURE_2D, filterblur->midtexture);
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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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static void
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gst_gl_filterblur_reset_resources (GstGLFilter * filter)
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{
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GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (filter);
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GstGLFuncs *gl = filter->context->gl_vtable;
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gl->DeleteTextures (1, &filterblur->midtexture);
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}
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static void
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gst_gl_filterblur_class_init (GstGLFilterBlurClass * 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_filterblur_set_property;
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gobject_class->get_property = gst_gl_filterblur_get_property;
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gst_element_class_set_metadata (element_class, "Gstreamer OpenGL Blur",
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"Filter/Effect/Video", "Blur with 9x9 separable convolution",
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"Filippo Argiolas <filippo.argiolas@gmail.com>");
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GST_GL_FILTER_CLASS (klass)->filter_texture =
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gst_gl_filterblur_filter_texture;
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GST_GL_FILTER_CLASS (klass)->display_init_cb =
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gst_gl_filterblur_init_resources;
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GST_GL_FILTER_CLASS (klass)->display_reset_cb =
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gst_gl_filterblur_reset_resources;
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GST_GL_FILTER_CLASS (klass)->onInitFBO = gst_gl_filterblur_init_shader;
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GST_GL_FILTER_CLASS (klass)->onReset = gst_gl_filter_filterblur_reset;
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}
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static void
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gst_gl_filterblur_init (GstGLFilterBlur * filterblur)
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{
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filterblur->shader0 = NULL;
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filterblur->shader1 = NULL;
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filterblur->midtexture = 0;
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/* gaussian kernel (well, actually vector), size 9, standard
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* deviation 3.0 */
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/* FIXME: eventually make this a runtime property */
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fill_gaussian_kernel (filterblur->gauss_kernel, 7, 3.0);
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}
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static void
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gst_gl_filter_filterblur_reset (GstGLFilter * filter)
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{
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GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (filter);
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//blocking call, wait the opengl thread has destroyed the shader
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if (filterblur->shader0)
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gst_gl_context_del_shader (filter->context, filterblur->shader0);
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filterblur->shader0 = NULL;
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//blocking call, wait the opengl thread has destroyed the shader
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if (filterblur->shader1)
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gst_gl_context_del_shader (filter->context, filterblur->shader1);
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filterblur->shader1 = NULL;
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}
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static void
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gst_gl_filterblur_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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/* GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (object); */
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switch (prop_id) {
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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_filterblur_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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/* GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (object); */
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switch (prop_id) {
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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_filterblur_init_shader (GstGLFilter * filter)
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{
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GstGLFilterBlur *blur_filter = GST_GL_FILTERBLUR (filter);
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//blocking call, wait the opengl thread has compiled the shader
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if (!gst_gl_context_gen_shader (filter->context, 0, hconv7_fragment_source,
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&blur_filter->shader0))
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return FALSE;
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//blocking call, wait the opengl thread has compiled the shader
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if (!gst_gl_context_gen_shader (filter->context, 0, vconv7_fragment_source,
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&blur_filter->shader1))
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return FALSE;
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return TRUE;
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}
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static gboolean
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gst_gl_filterblur_filter_texture (GstGLFilter * filter, guint in_tex,
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guint out_tex)
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{
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GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (filter);
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gst_gl_filter_render_to_target (filter, TRUE, in_tex,
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filterblur->midtexture, gst_gl_filterblur_hcallback, filterblur);
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gst_gl_filter_render_to_target (filter, FALSE, filterblur->midtexture,
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out_tex, gst_gl_filterblur_vcallback, filterblur);
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return TRUE;
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}
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static void
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gst_gl_filterblur_hcallback (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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GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (filter);
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GstGLFuncs *gl = filter->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
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gl->LoadIdentity ();
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gst_gl_shader_use (filterblur->shader0);
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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 (filterblur->shader0, "tex", 1);
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gst_gl_shader_set_uniform_1fv (filterblur->shader0, "kernel", 7,
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filterblur->gauss_kernel);
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gst_gl_shader_set_uniform_1f (filterblur->shader0, "width", width);
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gst_gl_filter_draw_texture (filter, texture, width, height);
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}
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static void
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gst_gl_filterblur_vcallback (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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GstGLFilterBlur *filterblur = GST_GL_FILTERBLUR (filter);
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GstGLFuncs *gl = filter->context->gl_vtable;
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gl->MatrixMode (GL_PROJECTION);
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gl->LoadIdentity ();
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gst_gl_shader_use (filterblur->shader1);
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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 (filterblur->shader1, "tex", 1);
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gst_gl_shader_set_uniform_1fv (filterblur->shader1, "kernel", 7,
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filterblur->gauss_kernel);
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gst_gl_shader_set_uniform_1f (filterblur->shader1, "height", height);
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gst_gl_filter_draw_texture (filter, texture, width, height);
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}
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