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test-constrains: Use a ShaderEffect

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Demonstrate how to use a ShaderEffect instance.
This commit is contained in:
Emmanuele Bassi 2011-05-25 15:38:56 +01:00
parent 53483896a8
commit 941d8d23fa
1 changed files with 39 additions and 3 deletions
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42
tests/interactive/test-constraints.c
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@ -2,6 +2,8 @@
#include <gmodule.h>
#include <clutter/clutter.h>
#define RECT_SIZE 128
#define H_PADDING 32
#define V_PADDING 32
@ -21,6 +23,24 @@ static const gchar *colors[N_RECTS] = {
"#ef2929", "#cc0000", "#a40000"
};
static const gchar *desaturare_glsl_shader =
"uniform sampler2D tex;\n"
"uniform float factor;\n"
"\n"
"vec3 desaturate (const vec3 color, const float desaturation)\n"
"{\n"
" 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 gboolean is_expanded = FALSE;
static gboolean
@ -61,7 +81,7 @@ on_button_release (ClutterActor *actor,
"@constraints.x-bind.offset", west_offset,
NULL);
clutter_actor_animate (rects[Center], CLUTTER_LINEAR, 500,
"opacity", 128,
"@effects.desaturate.enabled", TRUE,
NULL);
clutter_actor_animate (rects[East], CLUTTER_EASE_OUT_CUBIC, 500,
"opacity", 255,
@ -88,7 +108,7 @@ on_button_release (ClutterActor *actor,
gint i;
clutter_actor_animate (rects[Center], CLUTTER_LINEAR, 500,
"opacity", 255,
"@effects.desaturate.enabled", FALSE,
NULL);
for (i = NorthWest; i < N_RECTS; i++)
@ -114,6 +134,7 @@ test_constraints_main (int argc, char *argv[])
{
ClutterActor *stage, *rect;
ClutterConstraint *constraint;
ClutterEffect *effect;
ClutterColor rect_color;
gint i;
@ -133,7 +154,7 @@ test_constraints_main (int argc, char *argv[])
G_CALLBACK (on_button_release),
NULL);
clutter_rectangle_set_color (CLUTTER_RECTANGLE (rect), &rect_color);
clutter_actor_set_size (rect, 128, 128);
clutter_actor_set_size (rect, RECT_SIZE, RECT_SIZE);
clutter_actor_set_reactive (rect, TRUE);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), rect);
@ -143,6 +164,21 @@ test_constraints_main (int argc, char *argv[])
constraint = clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5);
clutter_actor_add_constraint_with_name (rect, "y-align", constraint);
/* this is the equivalent of the DesaturateEffect; we cannot animate
* the factor because the animation API only understands GObject
* properties; so we use the ActorMeta:enabled property to toggle
* the shader
*/
effect = clutter_shader_effect_new (CLUTTER_FRAGMENT_SHADER);
clutter_shader_effect_set_shader_source (CLUTTER_SHADER_EFFECT (effect),
desaturare_glsl_shader);
clutter_shader_effect_set_uniform (CLUTTER_SHADER_EFFECT (effect),
"tex", G_TYPE_INT, 1, 0);
clutter_shader_effect_set_uniform (CLUTTER_SHADER_EFFECT (effect),
"factor", G_TYPE_FLOAT, 1, 0.85);
clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), FALSE);
clutter_actor_add_effect_with_name (rect, "desaturate", effect);
rects[Center] = rect;
for (i = 0; i < N_RECTS; i++)