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222 lines
7.1 KiB
C
222 lines
7.1 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-glfilterlaplacian
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*
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* Laplacian Convolution Demo Filter.
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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 ! glfilterlaplacian ! 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 "gstglfilterlaplacian.h"
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#define GST_CAT_DEFAULT gst_gl_filter_laplacian_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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enum
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{
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PROP_0
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};
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#define DEBUG_INIT \
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GST_DEBUG_CATEGORY_INIT (gst_gl_filter_laplacian_debug, "glfilterlaplacian", 0, "glfilterlaplacian element");
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G_DEFINE_TYPE_WITH_CODE (GstGLFilterLaplacian, gst_gl_filter_laplacian,
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GST_TYPE_GL_FILTER, DEBUG_INIT);
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static void gst_gl_filter_laplacian_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_gl_filter_laplacian_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static void gst_gl_filter_laplacian_reset (GstGLFilter * filter);
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static gboolean gst_gl_filter_laplacian_init_shader (GstGLFilter * filter);
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static gboolean gst_gl_filter_laplacian_filter_texture (GstGLFilter * filter,
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guint in_tex, guint out_tex);
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static void gst_gl_filter_laplacian_callback (gint width, gint height,
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guint texture, gpointer stuff);
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/* *INDENT-OFF* */
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/* This filter is meant as a demo of gst-plugins-gl + glsl
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capabilities. So I'm keeping this shader readable enough. If and
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when this shader will be used in production be careful to hard code
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kernel into the shader and remove unneeded zero multiplications in
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the convolution */
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static const gchar *convolution_fragment_source =
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"uniform sampler2D tex;"
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"uniform float kernel[9];"
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"uniform float width, height;"
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"void main () {"
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" float w = 1.0 / width;"
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" float h = 1.0 / height;"
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" vec2 texturecoord[9];"
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" texturecoord[4] = gl_TexCoord[0].st;" /* 0 0 */
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" texturecoord[5] = texturecoord[4] + vec2(w, 0.0);" /* 1 0 */
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" texturecoord[2] = texturecoord[5] - vec2(0.0, h);" /* 1 -1 */
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" texturecoord[1] = texturecoord[2] - vec2(w, 0.0);" /* 0 -1 */
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" texturecoord[0] = texturecoord[1] - vec2(w, 0.0);" /* -1 -1 */
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" texturecoord[3] = texturecoord[0] + vec2(0.0, h);" /* -1 0 */
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" texturecoord[6] = texturecoord[3] + vec2(0.0, h);" /* -1 1 */
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" texturecoord[7] = texturecoord[6] + vec2(w, 0.0);" /* 0 1 */
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" texturecoord[8] = texturecoord[7] + vec2(w, 0.0);" /* 1 1 */
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" int i;"
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" vec4 sum = vec4 (0.0);"
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" for (i = 0; i < 9; i++) { "
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" vec4 neighbor = texture2D(tex, texturecoord[i]);"
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" sum += neighbor * kernel[i];"
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" }"
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" gl_FragColor = sum;"
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"}";
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/* *INDENT-ON* */
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static void
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gst_gl_filter_laplacian_class_init (GstGLFilterLaplacianClass * 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_filter_laplacian_set_property;
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gobject_class->get_property = gst_gl_filter_laplacian_get_property;
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gst_element_class_set_metadata (element_class,
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"OpenGL laplacian filter", "Filter/Effect/Video",
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"Laplacian Convolution Demo Filter",
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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_filter_laplacian_filter_texture;
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GST_GL_FILTER_CLASS (klass)->onInitFBO = gst_gl_filter_laplacian_init_shader;
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GST_GL_FILTER_CLASS (klass)->onReset = gst_gl_filter_laplacian_reset;
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}
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static void
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gst_gl_filter_laplacian_init (GstGLFilterLaplacian * filter)
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{
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filter->shader = NULL;
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}
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static void
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gst_gl_filter_laplacian_reset (GstGLFilter * filter)
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{
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GstGLFilterLaplacian *laplacian_filter = GST_GL_FILTER_LAPLACIAN (filter);
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//blocking call, wait the opengl thread has destroyed the shader
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if (laplacian_filter->shader)
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gst_gl_context_del_shader (filter->context, laplacian_filter->shader);
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laplacian_filter->shader = NULL;
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}
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static void
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gst_gl_filter_laplacian_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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//GstGLFilterLaplacian *filter = GST_GL_FILTER_LAPLACIAN (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_filter_laplacian_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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//GstGLFilterLaplacian *filter = GST_GL_FILTER_LAPLACIAN (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_filter_laplacian_init_shader (GstGLFilter * filter)
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{
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GstGLFilterLaplacian *laplacian_filter = GST_GL_FILTER_LAPLACIAN (filter);
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//blocking call, wait the opengl thread has compiled the shader
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return gst_gl_context_gen_shader (filter->context, 0,
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convolution_fragment_source, &laplacian_filter->shader);
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}
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static gboolean
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gst_gl_filter_laplacian_filter_texture (GstGLFilter * filter, guint in_tex,
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guint out_tex)
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{
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gpointer laplacian_filter = GST_GL_FILTER_LAPLACIAN (filter);
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//blocking call, use a FBO
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gst_gl_filter_render_to_target (filter, TRUE, in_tex, out_tex,
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gst_gl_filter_laplacian_callback, laplacian_filter);
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return TRUE;
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}
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//opengl scene, params: input texture (not the output filter->texture)
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static void
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gst_gl_filter_laplacian_callback (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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GstGLFilterLaplacian *laplacian_filter = GST_GL_FILTER_LAPLACIAN (filter);
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GstGLFuncs *gl = filter->context->gl_vtable;
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gfloat kernel[9] = { 0.0, -1.0, 0.0,
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-1.0, 4.0, -1.0,
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0.0, -1.0, 0.0
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};
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gl->MatrixMode (GL_PROJECTION);
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gl->LoadIdentity ();
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gst_gl_shader_use (laplacian_filter->shader);
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gl->ActiveTexture (GL_TEXTURE0);
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gl->Enable (GL_TEXTURE_2D);
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gl->BindTexture (GL_TEXTURE_2D, texture);
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gst_gl_shader_set_uniform_1i (laplacian_filter->shader, "tex", 0);
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gst_gl_shader_set_uniform_1fv (laplacian_filter->shader, "kernel", 9, kernel);
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gst_gl_shader_set_uniform_1f (laplacian_filter->shader, "width",
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(gfloat) width);
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gst_gl_shader_set_uniform_1f (laplacian_filter->shader, "height",
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(gfloat) height);
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gst_gl_filter_draw_texture (filter, texture, width, height);
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}
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