/**
* clutter_shader_set_is_enabled:
* @shader: a #ClutterShader
* @enabled: The new state of the shader.
*
* Enables a shader. This function will attempt to compile and link
* the shader, if it isn't already.
*
* When @enabled is %FALSE the default state of the GL pipeline will be
* used instead.
*
* Since: 0.6
*/
void
clutter_shader_set_is_enabled (ClutterShader *shader,
gboolean enabled)
{
ClutterShaderPrivate *priv;
g_return_if_fail (CLUTTER_IS_SHADER (shader));
priv = shader->priv;
if (priv->is_enabled != enabled)
{
GError *error = NULL;
gboolean res;
res = clutter_shader_compile (shader, &error);
if (!res)
{
g_warning ("Unable to bind the shader: %s",
error ? error->message : "unknown error");
if (error)
g_error_free (error);
return;
}
priv->is_enabled = enabled;
if (priv->is_enabled)
cogl_program_use (priv->program);
else
cogl_program_use (COGL_INVALID_HANDLE);
g_object_notify (G_OBJECT (shader), "enabled");
}
}
G_MODULE_EXPORT gint
test_shader_main (gint argc, gchar *argv[])
{
ClutterActor *actor;
ClutterActor *stage;
ClutterColor stage_color = { 0x61, 0x64, 0x8c, 0xff };
ClutterShader *shader;
GError *error;
gchar *file;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
stage = clutter_stage_new ();
clutter_stage_set_title (CLUTTER_STAGE (stage), "Shaders");
clutter_actor_set_size (stage, 512, 384);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
g_print ("applying shaders[%i] named '%s'\n",
shader_no,
shaders[shader_no].name);
shader = clutter_shader_new ();
error = NULL;
clutter_shader_set_fragment_source (shader, shaders[shader_no].source, -1);
clutter_shader_compile (shader, &error);
if (error)
{
g_print ("unable to load shaders[%d] named '%s': %s\n",
shader_no,
shaders[shader_no].name,
error->message);
g_error_free (error);
return EXIT_FAILURE;
}
clutter_stage_set_title (CLUTTER_STAGE (stage), "Shader Test");
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
file = g_build_filename (TESTS_DATADIR, "redhand.png", NULL);
#ifndef TEST_GROUP
actor = clutter_texture_new_from_file (file, &error);
if (!actor)
g_error("pixbuf load failed: %s", error ? error->message : "Unknown");
#else
actor = clutter_group_new ();
{
ClutterActor *child1, *child2, *child3, *child4;
ClutterColor color = { 0xff, 0x22, 0x66, 0x99 };
child1 = clutter_texture_new_from_file (file, &error);
if (!child1)
g_error("pixbuf load failed: %s", error ? error->message : "Unknown");
child2 = clutter_texture_new_from_file (file, &error);
if (!child2)
g_error("pixbuf load failed: %s", error ? error->message : "Unknown");
child3 = clutter_rectangle_new ();
child4 = clutter_text_new_with_text ("Sans 20px", "Shady stuff");
clutter_rectangle_set_color (CLUTTER_RECTANGLE (child3), &color);
clutter_actor_set_size (child3, 50, 50);
clutter_actor_set_position (child1, 0, 0);
clutter_actor_set_position (child2, 50, 100);
clutter_actor_set_position (child3, 30, -30);
clutter_actor_set_position (child4, -50, 20);
clutter_container_add (CLUTTER_CONTAINER (actor),
child1,
child2,
child3,
child4,
NULL);
clutter_actor_show_all (actor);
}
#endif /* !TEST_GROUP */
g_free (file);
clutter_actor_set_shader (actor, shader);
clutter_actor_set_position (actor, 100, 100);
g_object_unref (shader);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), actor);
clutter_actor_set_shader_param_int (actor, "tex", 0);
clutter_actor_set_shader_param_float (actor, "brightness", 0.4);
clutter_actor_set_shader_param_float (actor, "contrast", -1.9);
clutter_actor_set_reactive (actor, TRUE);
g_signal_connect (actor, "button-release-event",
G_CALLBACK (button_release_cb), NULL);
#ifdef COGL_HAS_GLES2
/* On an embedded platform it is difficult to right click so we will
cycle through the shaders automatically */
g_timeout_add_seconds (3, timeout_cb, actor);
#endif
/* Show everying ( and map window ) */
clutter_actor_show_all (stage);
clutter_main ();
return EXIT_SUCCESS;
}
static void
set_shader_num (ClutterActor *actor, gint new_no)
{
int tex_width;
int tex_height;
if (new_no >= 0 && shaders[new_no].name)
{
ClutterShader *shader;
GError *error;
shader_no = new_no;
g_print ("setting shaders[%i] named '%s'\n",
shader_no,
shaders[shader_no].name);
shader = clutter_shader_new ();
error = NULL;
g_object_set (G_OBJECT (shader),
"fragment-source", shaders[shader_no].source,
NULL);
/* try to bind the shader, provoking an error we catch if there is issues
* with the shader sources we've provided. At a later stage it should be
* possible to iterate through a set of alternate shader sources (glsl ->
* asm -> cg?) and the one that succesfully compiles is used.
*/
clutter_shader_compile (shader, &error);
if (error)
{
g_print ("unable to set shaders[%i] named '%s': %s",
shader_no, shaders[shader_no].name,
error->message);
g_error_free (error);
clutter_actor_set_shader (actor, NULL);
}
else
{
clutter_actor_set_shader (actor, NULL);
clutter_actor_set_shader (actor, shader);
clutter_actor_set_shader_param_int (actor, "tex", 0);
clutter_actor_set_shader_param_float (actor, "radius", 3.0);
clutter_actor_set_shader_param_float (actor, "brightness", 0.4);
clutter_actor_set_shader_param_float (actor, "contrast", -1.9);
if (CLUTTER_IS_TEXTURE (actor))
{
/* XXX - this assumes *a lot* about how things are done
* internally on *some* hardware and driver
*/
tex_width = clutter_actor_get_width (actor);
tex_width = next_p2 (tex_width);
tex_height = clutter_actor_get_height (actor);
tex_height = next_p2 (tex_height);
clutter_actor_set_shader_param_float (actor, "x_step",
1.0f / tex_width);
clutter_actor_set_shader_param_float (actor, "y_step",
1.0f / tex_height);
}
}
g_object_unref (shader);
}
}
