--- /dev/null
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ * Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+/**
+ * SECTION:clutter-blur-effect
+ * @short_description: A blur effect
+ * @see_also: #ClutterEffect, #ClutterOffscreenEffect
+ *
+ * #ClutterBlurEffect is a sub-class of #ClutterEffect that allows blurring a
+ * actor and its contents.
+ *
+ * #ClutterBlurEffect uses the programmable pipeline of the GPU and an
+ * offscreen buffer, so it is only available on graphics hardware that supports
+ * these two features.
+ *
+ * #ClutterBlurEffect is available since Clutter 1.4
+ */
+
+#define CLUTTER_BLUR_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_BLUR_EFFECT, ClutterBlurEffectClass))
+#define CLUTTER_IS_BLUR_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_BLUR_EFFECT))
+#define CLUTTER_BLUR_EFFECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_BLUR_EFFECT, ClutterBlurEffectClass))
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "clutter-blur-effect.h"
+
+#include "cogl/cogl.h"
+
+#include "clutter-debug.h"
+#include "clutter-private.h"
+#include "clutter-shader-effect.h"
+
+typedef struct _ClutterBlurEffectClass ClutterBlurEffectClass;
+
+/* FIXME - lame shader; we should really have a decoupled
+ * horizontal/vertical two pass shader for the gaussian blur
+ */
+static const gchar *box_blur_glsl_shader =
+"uniform sampler2D tex;\n"
+"uniform float x_step, y_step;\n"
+"\n"
+"vec4 get_rgba_rel (sampler2D source, float dx, float dy)\n"
+"{\n"
+" return texture2D (tex, gl_TexCoord[0].st + vec2 (dx, dy) * 2.0);\n"
+"}\n"
+"\n"
+"void main ()\n"
+"{\n"
+" vec4 color = gl_Color * texture2D (tex, vec2 (gl_TexCoord[0].xy));\n"
+" float count = 1.0;\n"
+" color += get_rgba_rel (tex, -x_step, -y_step); count++;\n"
+" color += get_rgba_rel (tex, -x_step, 0.0); count++;\n"
+" color += get_rgba_rel (tex, 0.0, -y_step); count++;\n"
+" color += get_rgba_rel (tex, 0.0, 0.0); count++;\n"
+" color += get_rgba_rel (tex, 0.0, y_step); count++;\n"
+" color += get_rgba_rel (tex, x_step, -y_step); count++;\n"
+" color += get_rgba_rel (tex, x_step, 0.0); count++;\n"
+" color += get_rgba_rel (tex, x_step, y_step); count++;\n"
+" gl_FragColor = color / count;\n"
+"}";
+
+struct _ClutterBlurEffect
+{
+ ClutterShaderEffect parent_instance;
+
+ /* a back pointer to our actor, so that we can query it */
+ ClutterActor *actor;
+
+ /* the parameters; x_step and y_step depend on
+ * the actor's allocation
+ */
+ gfloat x_step;
+ gfloat y_step;
+
+ guint source_set : 1;
+};
+
+struct _ClutterBlurEffectClass
+{
+ ClutterShaderEffectClass parent_class;
+};
+
+enum
+{
+ PROP_0
+};
+
+G_DEFINE_TYPE (ClutterBlurEffect,
+ clutter_blur_effect,
+ CLUTTER_TYPE_SHADER_EFFECT);
+
+static int
+next_p2 (int a)
+{
+ int rval = 1;
+
+ while (rval < a)
+ rval <<= 1;
+
+ return rval;
+}
+
+static gboolean
+clutter_blur_effect_pre_paint (ClutterEffect *effect)
+{
+ ClutterBlurEffect *self = CLUTTER_BLUR_EFFECT (effect);
+ ClutterShaderEffect *shader_effect;
+ ClutterEffectClass *parent_class;
+ ClutterActorBox allocation;
+ gfloat width, height;
+
+ if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (effect)))
+ return FALSE;
+
+ self->actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (effect));
+ if (self->actor == NULL)
+ return FALSE;
+
+ clutter_actor_get_allocation_box (self->actor, &allocation);
+ clutter_actor_box_get_size (&allocation, &width, &height);
+
+ self->x_step = 1.0f / (float) next_p2 (width);
+ self->y_step = 1.0f / (float) next_p2 (height);
+
+ shader_effect = CLUTTER_SHADER_EFFECT (effect);
+
+ if (!self->source_set)
+ {
+ CoglHandle shader = clutter_shader_effect_get_shader (shader_effect);
+
+ if (shader == COGL_INVALID_HANDLE)
+ return FALSE;
+
+ cogl_shader_source (shader, box_blur_glsl_shader);
+ self->source_set = TRUE;
+ }
+
+ clutter_shader_effect_set_uniform (shader_effect,
+ "tex",
+ G_TYPE_INT, 1,
+ 0);
+ clutter_shader_effect_set_uniform (shader_effect,
+ "x_step",
+ G_TYPE_FLOAT, 1,
+ self->x_step);
+ clutter_shader_effect_set_uniform (shader_effect,
+ "y_step",
+ G_TYPE_FLOAT, 1,
+ self->y_step);
+
+ parent_class = CLUTTER_EFFECT_CLASS (clutter_blur_effect_parent_class);
+ return parent_class->pre_paint (effect);
+}
+
+static void
+clutter_blur_effect_finalize (GObject *gobject)
+{
+ G_OBJECT_CLASS (clutter_blur_effect_parent_class)->finalize (gobject);
+}
+
+static void
+clutter_blur_effect_set_property (GObject *gobject,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ switch (prop_id)
+ {
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+clutter_blur_effect_get_property (GObject *gobject,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ switch (prop_id)
+ {
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+clutter_blur_effect_class_init (ClutterBlurEffectClass *klass)
+{
+ ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
+ GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+ effect_class->pre_paint = clutter_blur_effect_pre_paint;
+
+ gobject_class->set_property = clutter_blur_effect_set_property;
+ gobject_class->get_property = clutter_blur_effect_get_property;
+ gobject_class->finalize = clutter_blur_effect_finalize;
+}
+
+static void
+clutter_blur_effect_init (ClutterBlurEffect *self)
+{
+}
+
+/**
+ * clutter_blur_effect_new:
+ *
+ * Creates a new #ClutterBlurEffect to be used with
+ * clutter_actor_set_effect()
+ *
+ * Return value: the newly created #ClutterBlurEffect or %NULL
+ *
+ * Since: 1.4
+ */
+ClutterEffect *
+clutter_blur_effect_new (void)
+{
+ return g_object_new (CLUTTER_TYPE_BLUR_EFFECT, NULL);
+}
--- /dev/null
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ * Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <clutter/clutter.h> can be included directly."
+#endif
+
+#ifndef __CLUTTER_BLUR_EFFECT_H__
+#define __CLUTTER_BLUR_EFFECT_H__
+
+#include <clutter/clutter-effect.h>
+
+G_BEGIN_DECLS
+
+#define CLUTTER_TYPE_BLUR_EFFECT (clutter_blur_effect_get_type ())
+#define CLUTTER_BLUR_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BLUR_EFFECT, ClutterBlurEffect))
+#define CLUTTER_IS_BLUR_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BLUR_EFFECT))
+
+/**
+ * ClutterBlurEffect:
+ *
+ * <structname>ClutterBlurEffect</structname> is an opaque structure
+ * whose members cannot be accessed directly
+ *
+ * Since: 1.4
+ */
+typedef struct _ClutterBlurEffect ClutterBlurEffect;
+
+GType clutter_blur_effect_get_type (void) G_GNUC_CONST;
+
+ClutterEffect *clutter_blur_effect_new (void);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_BLUR_EFFECT_H__ */
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