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mutter/clutter/clutter-blur-effect.c

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effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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/*
* 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 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"
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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#include "clutter-offscreen-effect.h"
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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#include "clutter-private.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, 0.0, -y_step); count++;\n"
" color += get_rgba_rel (tex, x_step, -y_step); count++;\n"
blur-effect: Fix loop unrolling The box blur shader was not sampling all the points for producing the desired effect.
2010-06-07 10:45:24 -04:00
" color += get_rgba_rel (tex, -x_step, 0.0); count++;\n"
" color += get_rgba_rel (tex, 0.0, 0.0); count++;\n"
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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" color += get_rgba_rel (tex, x_step, 0.0); count++;\n"
blur-effect: Fix loop unrolling The box blur shader was not sampling all the points for producing the desired effect.
2010-06-07 10:45:24 -04:00
" color += get_rgba_rel (tex, -x_step, y_step); count++;\n"
" color += get_rgba_rel (tex, 0.0, y_step); count++;\n"
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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" color += get_rgba_rel (tex, x_step, y_step); count++;\n"
" gl_FragColor = color / count;\n"
"}";
struct _ClutterBlurEffect
{
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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ClutterOffscreenEffect parent_instance;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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/* 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;
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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CoglHandle shader;
CoglHandle program;
gint tex_uniform;
gint x_step_uniform;
gint y_step_uniform;
guint is_compiled : 1;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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};
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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struct _ClutterBlurEffectClass
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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{
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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ClutterOffscreenEffectClass parent_class;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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};
G_DEFINE_TYPE (ClutterBlurEffect,
clutter_blur_effect,
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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CLUTTER_TYPE_OFFSCREEN_EFFECT);
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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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);
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;
effects: Check before using the cogl_shader_* API Since BlurEffect and DesaturateEffect are using the shader API implicitly and not using ClutterShaderEffect, we need to check if the underlying GL implementation supports the GLSL shading language and warn if not.
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if (!clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
{
/* if we don't have support for GLSL shaders then we
* forcibly disable the ActorMeta
*/
g_warning ("Unable to use the ShaderEffect: the graphics hardware "
"or the current GL driver does not implement support "
"for the GLSL shading language.");
clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), FALSE);
return FALSE;
}
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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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);
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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if (self->shader == COGL_INVALID_HANDLE)
{
self->shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (self->shader, box_blur_glsl_shader);
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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self->is_compiled = FALSE;
self->tex_uniform = -1;
self->x_step_uniform = -1;
self->y_step_uniform = -1;
}
if (self->program == COGL_INVALID_HANDLE)
self->program = cogl_create_program ();
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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if (!self->is_compiled)
{
g_assert (self->shader != COGL_INVALID_HANDLE);
g_assert (self->program != COGL_INVALID_HANDLE);
cogl_shader_compile (self->shader);
if (!cogl_shader_is_compiled (self->shader))
{
gchar *log_buf = cogl_shader_get_info_log (self->shader);
g_warning (G_STRLOC ": Unable to compile the box blur shader: %s",
log_buf);
g_free (log_buf);
cogl_handle_unref (self->shader);
cogl_handle_unref (self->program);
self->shader = COGL_INVALID_HANDLE;
self->program = COGL_INVALID_HANDLE;
}
else
{
cogl_program_attach_shader (self->program, self->shader);
cogl_program_link (self->program);
cogl_handle_unref (self->shader);
self->is_compiled = TRUE;
self->tex_uniform =
cogl_program_get_uniform_location (self->program, "tex");
self->x_step_uniform =
cogl_program_get_uniform_location (self->program, "x_step");
self->y_step_uniform =
cogl_program_get_uniform_location (self->program, "y_step");
}
}
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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parent_class = CLUTTER_EFFECT_CLASS (clutter_blur_effect_parent_class);
return parent_class->pre_paint (effect);
}
static void
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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clutter_blur_effect_paint_target (ClutterOffscreenEffect *effect)
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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{
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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ClutterBlurEffect *self = CLUTTER_BLUR_EFFECT (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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if (self->program == COGL_INVALID_HANDLE)
goto out;
cogl_program_use (self->program);
if (self->tex_uniform > -1)
cogl_program_uniform_1i (self->tex_uniform, 0);
if (self->x_step_uniform > -1)
cogl_program_uniform_1f (self->x_step_uniform, self->x_step);
if (self->y_step_uniform > -1)
cogl_program_uniform_1f (self->y_step_uniform, self->y_step);
cogl_program_use (COGL_INVALID_HANDLE);
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);
out:
parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (clutter_blur_effect_parent_class);
parent->paint_target (effect);
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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}
static void
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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clutter_blur_effect_dispose (GObject *gobject)
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
{
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
2010-08-11 08:05:42 -04:00
ClutterBlurEffect *self = CLUTTER_BLUR_EFFECT (gobject);
if (self->program != COGL_INVALID_HANDLE)
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
{
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
2010-08-11 08:05:42 -04:00
cogl_handle_unref (self->program);
self->program = COGL_INVALID_HANDLE;
self->shader = COGL_INVALID_HANDLE;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
}
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
2010-08-11 08:05:42 -04:00
G_OBJECT_CLASS (clutter_blur_effect_parent_class)->dispose (gobject);
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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}
static void
clutter_blur_effect_class_init (ClutterBlurEffectClass *klass)
{
ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
2010-08-11 08:05:42 -04:00
ClutterOffscreenEffectClass *offscreen_class;
gobject_class->dispose = clutter_blur_effect_dispose;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
2010-04-08 13:46:54 -04:00
effect_class->pre_paint = clutter_blur_effect_pre_paint;
blur-effect: Do not inherit from ShaderEffect We might want to switch the BlurEffect from a box-blur to a super-sampling of the texture target, in order to make it cheap(er). If we inherit from ShaderEffect, though, we're setting in stone the fact that we are going to use a fragment shader for blurring. Since there is not parametrization of the blur, the code necessary to implement effect is pretty small, and we can use the Cogl API directly.
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offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass);
offscreen_class->paint_target = clutter_blur_effect_paint_target;
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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}
static void
clutter_blur_effect_init (ClutterBlurEffect *self)
{
}
/**
* clutter_blur_effect_new:
*
* Creates a new #ClutterBlurEffect to be used with
docs: Effects fixes for the API reference
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* clutter_actor_add_effect()
effect: Add BlurEffect A simple, GLSL shader-based blur effect. The blur shader is taken straight from the test-shader.c interactive test case. It's a fairly clunky, inefficient and visually incorrect implementation of a box blur, but it's all we have right now until I figure out a way to do multi-pass shading with the current API.
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*
* 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);
}
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