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Convert all of the internal shader-based effects to use snippets

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This converts the blur, colorize and desaturate effects to use
snippets instead of CoglPrograms. Cogl can handle the snippets much
more efficiently than programs so this should be a performance win. It
also fixes the problem that Cogl would end up recompiling the program
for every instance of the effects because Clutter was not reusing the
same program.

Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Neil Roberts 2011-11-28 13:46:30 +00:00
parent b4887c3699
commit 3218cd6865
3 changed files with 277 additions and 307 deletions
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203
clutter/clutter-blur-effect.c
View file

@ -54,29 +54,26 @@
/* FIXME - lame shader; we should really have a decoupled
* horizontal/vertical two pass shader for the gaussian blur
*/
static const gchar *box_blur_glsl_declarations =
"uniform vec2 pixel_step;\n";
/* FIXME: Is this shader right? It is doing 10 samples (ie, sampling
the middle texel twice) and then only dividing by 9 */
#define SAMPLE(offx, offy) \
"cogl_texel += texture2D (cogl_sampler, cogl_tex_coord.st + pixel_step * " \
"vec2 (" G_STRINGIFY (offx) ", " G_STRINGIFY (offy) ") * 2.0);\n"
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, cogl_tex_coord_in[0].st + vec2 (dx, dy) * 2.0);\n"
"}\n"
"\n"
"void main ()\n"
"{\n"
" vec4 color = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));\n"
" color += get_rgba_rel (tex, -x_step, -y_step);\n"
" color += get_rgba_rel (tex, 0.0, -y_step);\n"
" color += get_rgba_rel (tex, x_step, -y_step);\n"
" color += get_rgba_rel (tex, -x_step, 0.0);\n"
" color += get_rgba_rel (tex, 0.0, 0.0);\n"
" color += get_rgba_rel (tex, x_step, 0.0);\n"
" color += get_rgba_rel (tex, -x_step, y_step);\n"
" color += get_rgba_rel (tex, 0.0, y_step);\n"
" color += get_rgba_rel (tex, x_step, y_step);\n"
" cogl_color_out = color / 9.0;\n"
"}";
" cogl_texel = texture2D (cogl_sampler, cogl_tex_coord.st);\n"
SAMPLE (-1.0, -1.0)
SAMPLE ( 0.0, -1.0)
SAMPLE (+1.0, -1.0)
SAMPLE (-1.0, 0.0)
SAMPLE ( 0.0, 0.0)
SAMPLE (+1.0, 0.0)
SAMPLE (-1.0, +1.0)
SAMPLE ( 0.0, +1.0)
SAMPLE (+1.0, +1.0)
" cogl_texel /= 9.0;\n";
#undef SAMPLE
struct _ClutterBlurEffect
{
@ -85,19 +82,19 @@ struct _ClutterBlurEffect
/* a back pointer to our actor, so that we can query it */
ClutterActor *actor;
CoglHandle shader;
CoglHandle program;
gint pixel_step_uniform;
gint tex_uniform;
gint x_step_uniform;
gint y_step_uniform;
gint tex_width;
gint tex_height;
guint is_compiled : 1;
CoglPipeline *pipeline;
};
struct _ClutterBlurEffectClass
{
ClutterOffscreenEffectClass parent_class;
CoglPipeline *base_pipeline;
};
G_DEFINE_TYPE (ClutterBlurEffect,
@ -109,8 +106,6 @@ 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;
@ -131,103 +126,57 @@ clutter_blur_effect_pre_paint (ClutterEffect *effect)
return FALSE;
}
clutter_actor_get_allocation_box (self->actor, &allocation);
clutter_actor_box_get_size (&allocation, &width, &height);
if (self->shader == COGL_INVALID_HANDLE)
parent_class = CLUTTER_EFFECT_CLASS (clutter_blur_effect_parent_class);
if (parent_class->pre_paint (effect))
{
self->shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (self->shader, box_blur_glsl_shader);
ClutterOffscreenEffect *offscreen_effect =
CLUTTER_OFFSCREEN_EFFECT (effect);
CoglHandle texture;
self->is_compiled = FALSE;
self->tex_uniform = -1;
self->x_step_uniform = -1;
self->y_step_uniform = -1;
texture = clutter_offscreen_effect_get_texture (offscreen_effect);
self->tex_width = cogl_texture_get_width (texture);
self->tex_height = cogl_texture_get_height (texture);
if (self->pixel_step_uniform > -1)
{
gfloat pixel_step[2];
pixel_step[0] = 1.0f / self->tex_width;
pixel_step[1] = 1.0f / self->tex_height;
cogl_pipeline_set_uniform_float (self->pipeline,
self->pixel_step_uniform,
2, /* n_components */
1, /* count */
pixel_step);
}
if (self->program == COGL_INVALID_HANDLE)
self->program = cogl_create_program ();
cogl_pipeline_set_layer_texture (self->pipeline, 0, texture);
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;
return TRUE;
}
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");
}
}
parent_class = CLUTTER_EFFECT_CLASS (clutter_blur_effect_parent_class);
return parent_class->pre_paint (effect);
return FALSE;
}
static void
clutter_blur_effect_paint_target (ClutterOffscreenEffect *effect)
{
ClutterBlurEffect *self = CLUTTER_BLUR_EFFECT (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
CoglHandle texture;
guint8 paint_opacity;
if (self->program == COGL_INVALID_HANDLE)
goto out;
paint_opacity = clutter_actor_get_paint_opacity (self->actor);
texture = clutter_offscreen_effect_get_texture (effect);
cogl_pipeline_set_color4ub (self->pipeline,
paint_opacity,
paint_opacity,
paint_opacity,
paint_opacity);
cogl_push_source (self->pipeline);
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
cogl_rectangle (0, 0, self->tex_width, self->tex_height);
if (self->x_step_uniform > -1)
{
int width = cogl_texture_get_width (texture);
cogl_program_set_uniform_1f (self->program,
self->x_step_uniform,
1.0f / width);
}
if (self->y_step_uniform > -1)
{
int height = cogl_texture_get_height (texture);
cogl_program_set_uniform_1f (self->program,
self->y_step_uniform,
1.0f / height);
}
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);
cogl_pop_source ();
}
static gboolean
@ -257,12 +206,10 @@ clutter_blur_effect_dispose (GObject *gobject)
{
ClutterBlurEffect *self = CLUTTER_BLUR_EFFECT (gobject);
if (self->program != COGL_INVALID_HANDLE)
if (self->pipeline != NULL)
{
cogl_handle_unref (self->program);
self->program = COGL_INVALID_HANDLE;
self->shader = COGL_INVALID_HANDLE;
cogl_object_unref (self->pipeline);
self->pipeline = NULL;
}
G_OBJECT_CLASS (clutter_blur_effect_parent_class)->dispose (gobject);
@ -282,11 +229,37 @@ clutter_blur_effect_class_init (ClutterBlurEffectClass *klass)
offscreen_class = CLUTTER_OFFSCREEN_EFFECT_CLASS (klass);
offscreen_class->paint_target = clutter_blur_effect_paint_target;
klass->base_pipeline = cogl_pipeline_new ();
if (clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
{
CoglSnippet *snippet;
snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_TEXTURE_LOOKUP,
box_blur_glsl_declarations,
NULL);
cogl_snippet_set_replace (snippet,
box_blur_glsl_shader);
cogl_pipeline_add_layer_snippet (klass->base_pipeline, 0, snippet);
cogl_object_unref (snippet);
}
cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
0, /* layer number */
COGL_TEXTURE_TYPE_2D);
}
static void
clutter_blur_effect_init (ClutterBlurEffect *self)
{
CoglPipeline *base_pipeline =
CLUTTER_BLUR_EFFECT_GET_CLASS (self)->base_pipeline;
self->pipeline = cogl_pipeline_copy (base_pipeline);
self->pixel_step_uniform =
cogl_pipeline_get_uniform_location (self->pipeline, "pixel_step");
}
/**

176
clutter/clutter-colorize-effect.c
View file

@ -57,18 +57,19 @@ struct _ClutterColorizeEffect
/* the tint of the colorization */
ClutterColor tint;
CoglHandle shader;
CoglHandle program;
gint tex_uniform;
gint tint_uniform;
guint is_compiled : 1;
gint tex_width;
gint tex_height;
CoglPipeline *pipeline;
};
struct _ClutterColorizeEffectClass
{
ClutterOffscreenEffectClass parent_class;
CoglPipeline *base_pipeline;
};
/* the magic gray vec3 has been taken from the NTSC conversion weights
@ -78,16 +79,12 @@ struct _ClutterColorizeEffectClass
* -- Richard S. Wright Jr, Benjamin Lipchak, Nicholas Haemel
* Addison-Wesley
*/
static const gchar *colorize_glsl_shader =
"uniform sampler2D tex;\n"
"uniform vec3 tint;\n"
"\n"
"void main ()\n"
"{\n"
" vec4 color = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));\n"
" float gray = dot (color.rgb, vec3 (0.299, 0.587, 0.114));\n"
" cogl_color_out = vec4 (gray * tint, color.a);\n"
"}\n";
static const gchar *colorize_glsl_declarations =
"uniform vec3 tint;\n";
static const gchar *colorize_glsl_source =
"float gray = dot (cogl_color_out.rgb, vec3 (0.299, 0.587, 0.114));\n"
"cogl_color_out.rgb = gray * tint;\n";
/* a lame sepia */
static const ClutterColor default_tint = { 255, 204, 153, 255 };
@ -128,91 +125,45 @@ clutter_colorize_effect_pre_paint (ClutterEffect *effect)
return FALSE;
}
if (self->shader == COGL_INVALID_HANDLE)
parent_class = CLUTTER_EFFECT_CLASS (clutter_colorize_effect_parent_class);
if (parent_class->pre_paint (effect))
{
self->shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (self->shader, colorize_glsl_shader);
ClutterOffscreenEffect *offscreen_effect =
CLUTTER_OFFSCREEN_EFFECT (effect);
CoglHandle texture;
self->is_compiled = FALSE;
self->tex_uniform = -1;
self->tint_uniform = -1;
}
texture = clutter_offscreen_effect_get_texture (offscreen_effect);
self->tex_width = cogl_texture_get_width (texture);
self->tex_height = cogl_texture_get_height (texture);
if (self->program == COGL_INVALID_HANDLE)
self->program = cogl_create_program ();
cogl_pipeline_set_layer_texture (self->pipeline, 0, texture);
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 colorize 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;
return TRUE;
}
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->tint_uniform =
cogl_program_get_uniform_location (self->program, "tint");
}
}
parent_class = CLUTTER_EFFECT_CLASS (clutter_colorize_effect_parent_class);
return parent_class->pre_paint (effect);
return FALSE;
}
static void
clutter_colorize_effect_paint_target (ClutterOffscreenEffect *effect)
{
ClutterColorizeEffect *self = CLUTTER_COLORIZE_EFFECT (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
ClutterActor *actor;
guint8 paint_opacity;
if (self->program == COGL_INVALID_HANDLE)
goto out;
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (effect));
paint_opacity = clutter_actor_get_paint_opacity (actor);
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
cogl_pipeline_set_color4ub (self->pipeline,
paint_opacity,
paint_opacity,
paint_opacity,
paint_opacity);
cogl_push_source (self->pipeline);
if (self->tint_uniform > -1)
{
float tint[3] = {
self->tint.red / 255.0,
self->tint.green / 255.0,
self->tint.blue / 255.0
};
cogl_rectangle (0, 0, self->tex_width, self->tex_height);
cogl_program_set_uniform_float (self->program, self->tint_uniform,
3, 1,
tint);
}
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);
out:
parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (clutter_colorize_effect_parent_class);
parent->paint_target (effect);
cogl_pop_source ();
}
static void
@ -220,12 +171,10 @@ clutter_colorize_effect_dispose (GObject *gobject)
{
ClutterColorizeEffect *self = CLUTTER_COLORIZE_EFFECT (gobject);
if (self->program != COGL_INVALID_HANDLE)
if (self->pipeline != NULL)
{
cogl_handle_unref (self->program);
self->program = COGL_INVALID_HANDLE;
self->shader = COGL_INVALID_HANDLE;
cogl_object_unref (self->pipeline);
self->pipeline = NULL;
}
G_OBJECT_CLASS (clutter_colorize_effect_parent_class)->dispose (gobject);
@ -305,12 +254,59 @@ clutter_colorize_effect_class_init (ClutterColorizeEffectClass *klass)
g_object_class_install_properties (gobject_class,
PROP_LAST,
obj_props);
klass->base_pipeline = cogl_pipeline_new ();
if (clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
{
CoglSnippet *snippet;
snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
colorize_glsl_declarations,
colorize_glsl_source);
cogl_pipeline_add_snippet (klass->base_pipeline, snippet);
cogl_object_unref (snippet);
}
cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
0, /* layer number */
COGL_TEXTURE_TYPE_2D);
}
static void
update_tint_uniform (ClutterColorizeEffect *self)
{
if (self->tint_uniform > -1)
{
float tint[3] = {
self->tint.red / 255.0,
self->tint.green / 255.0,
self->tint.blue / 255.0
};
cogl_pipeline_set_uniform_float (self->pipeline,
self->tint_uniform,
3, /* n_components */
1, /* count */
tint);
}
}
static void
clutter_colorize_effect_init (ClutterColorizeEffect *self)
{
CoglPipeline *base_pipeline =
CLUTTER_COLORIZE_EFFECT_GET_CLASS (self)->base_pipeline;
self->pipeline = cogl_pipeline_copy (base_pipeline);
self->tint_uniform =
cogl_pipeline_get_uniform_location (self->pipeline, "tint");
self->tint = default_tint;
update_tint_uniform (self);
}
/**
@ -349,6 +345,8 @@ clutter_colorize_effect_set_tint (ClutterColorizeEffect *effect,
effect->tint = *tint;
update_tint_uniform (effect);
clutter_effect_queue_repaint (CLUTTER_EFFECT (effect));
g_object_notify_by_pspec (G_OBJECT (effect), obj_props[PROP_TINT]);

157
clutter/clutter-desaturate-effect.c
View file

@ -61,18 +61,19 @@ struct _ClutterDesaturateEffect
/* the desaturation factor, also known as "strength" */
gdouble factor;
CoglHandle shader;
CoglHandle program;
gint tex_uniform;
gint factor_uniform;
guint is_compiled : 1;
gint tex_width;
gint tex_height;
CoglPipeline *pipeline;
};
struct _ClutterDesaturateEffectClass
{
ClutterOffscreenEffectClass parent_class;
CoglPipeline *base_pipeline;
};
/* the magic gray vec3 has been taken from the NTSC conversion weights
@ -82,8 +83,7 @@ struct _ClutterDesaturateEffectClass
* -- Richard S. Wright Jr, Benjamin Lipchak, Nicholas Haemel
* Addison-Wesley
*/
static const gchar *desaturate_glsl_shader =
"uniform sampler2D tex;\n"
static const gchar *desaturate_glsl_declarations =
"uniform float factor;\n"
"\n"
"vec3 desaturate (const vec3 color, const float desaturation)\n"
@ -91,15 +91,11 @@ static const gchar *desaturate_glsl_shader =
" const vec3 gray_conv = vec3 (0.299, 0.587, 0.114);\n"
" vec3 gray = vec3 (dot (gray_conv, color));\n"
" return vec3 (mix (color.rgb, gray, desaturation));\n"
"}\n"
"\n"
"void main ()\n"
"{\n"
" vec4 color = cogl_color_in * texture2D (tex, vec2 (cogl_tex_coord_in[0].xy));\n"
" color.rgb = desaturate (color.rgb, factor);\n"
" cogl_color_out = color;\n"
"}\n";
static const gchar *desaturate_glsl_source =
" cogl_color_out.rgb = desaturate (cogl_color_out.rgb, factor);\n";
enum
{
PROP_0,
@ -136,83 +132,51 @@ clutter_desaturate_effect_pre_paint (ClutterEffect *effect)
return FALSE;
}
if (self->shader == COGL_INVALID_HANDLE)
parent_class = CLUTTER_EFFECT_CLASS (clutter_desaturate_effect_parent_class);
if (parent_class->pre_paint (effect))
{
self->shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (self->shader, desaturate_glsl_shader);
ClutterOffscreenEffect *offscreen_effect =
CLUTTER_OFFSCREEN_EFFECT (effect);
CoglHandle texture;
self->is_compiled = FALSE;
self->tex_uniform = -1;
self->factor_uniform = -1;
}
texture = clutter_offscreen_effect_get_texture (offscreen_effect);
self->tex_width = cogl_texture_get_width (texture);
self->tex_height = cogl_texture_get_height (texture);
if (self->program == COGL_INVALID_HANDLE)
self->program = cogl_create_program ();
cogl_pipeline_set_layer_texture (self->pipeline, 0, texture);
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 desaturate 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;
return TRUE;
}
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->factor_uniform =
cogl_program_get_uniform_location (self->program, "factor");
}
}
parent_class = CLUTTER_EFFECT_CLASS (clutter_desaturate_effect_parent_class);
return parent_class->pre_paint (effect);
return FALSE;
}
static void
clutter_desaturate_effect_paint_target (ClutterOffscreenEffect *effect)
{
ClutterDesaturateEffect *self = CLUTTER_DESATURATE_EFFECT (effect);
ClutterOffscreenEffectClass *parent;
CoglHandle material;
ClutterActor *actor;
CoglHandle texture;
guint8 paint_opacity;
if (self->program == COGL_INVALID_HANDLE)
goto out;
texture = clutter_offscreen_effect_get_texture (effect);
cogl_pipeline_set_layer_texture (self->pipeline, 0, texture);
if (self->tex_uniform > -1)
cogl_program_set_uniform_1i (self->program, self->tex_uniform, 0);
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (effect));
paint_opacity = clutter_actor_get_paint_opacity (actor);
if (self->factor_uniform > -1)
cogl_program_set_uniform_1f (self->program,
self->factor_uniform,
self->factor);
cogl_pipeline_set_color4ub (self->pipeline,
paint_opacity,
paint_opacity,
paint_opacity,
paint_opacity);
cogl_push_source (self->pipeline);
material = clutter_offscreen_effect_get_target (effect);
cogl_material_set_user_program (material, self->program);
cogl_rectangle (0, 0,
cogl_texture_get_width (texture),
cogl_texture_get_height (texture));
out:
parent = CLUTTER_OFFSCREEN_EFFECT_CLASS (clutter_desaturate_effect_parent_class);
parent->paint_target (effect);
cogl_pop_source ();
}
static void
@ -220,12 +184,10 @@ clutter_desaturate_effect_dispose (GObject *gobject)
{
ClutterDesaturateEffect *self = CLUTTER_DESATURATE_EFFECT (gobject);
if (self->program != COGL_INVALID_HANDLE)
if (self->pipeline != NULL)
{
cogl_handle_unref (self->program);
self->program = COGL_INVALID_HANDLE;
self->shader = COGL_INVALID_HANDLE;
cogl_object_unref (self->pipeline);
self->pipeline = NULL;
}
G_OBJECT_CLASS (clutter_desaturate_effect_parent_class)->dispose (gobject);
@ -272,6 +234,15 @@ clutter_desaturate_effect_get_property (GObject *gobject,
}
}
static void
update_factor_uniform (ClutterDesaturateEffect *self)
{
if (self->factor_uniform > -1)
cogl_pipeline_set_uniform_1f (self->pipeline,
self->factor_uniform,
self->factor);
}
static void
clutter_desaturate_effect_class_init (ClutterDesaturateEffectClass *klass)
{
@ -307,12 +278,39 @@ clutter_desaturate_effect_class_init (ClutterDesaturateEffectClass *klass)
g_object_class_install_properties (gobject_class,
PROP_LAST,
obj_props);
klass->base_pipeline = cogl_pipeline_new ();
if (clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
{
CoglSnippet *snippet;
snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
desaturate_glsl_declarations,
desaturate_glsl_source);
cogl_pipeline_add_snippet (klass->base_pipeline, snippet);
cogl_object_unref (snippet);
}
cogl_pipeline_set_layer_null_texture (klass->base_pipeline,
0, /* layer number */
COGL_TEXTURE_TYPE_2D);
}
static void
clutter_desaturate_effect_init (ClutterDesaturateEffect *self)
{
CoglPipeline *base_pipeline =
CLUTTER_DESATURATE_EFFECT_GET_CLASS (self)->base_pipeline;
self->pipeline = cogl_pipeline_copy (base_pipeline);
self->factor_uniform =
cogl_pipeline_get_uniform_location (self->pipeline, "factor");
self->factor = 1.0;
update_factor_uniform (self);
}
/**
@ -356,6 +354,7 @@ clutter_desaturate_effect_set_factor (ClutterDesaturateEffect *effect,
if (fabsf (effect->factor - factor) >= 0.00001)
{
effect->factor = factor;
update_factor_uniform (effect);
clutter_effect_queue_repaint (CLUTTER_EFFECT (effect));