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