mutter/tests/interactive/test-cogl-point-sprites.c

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#include <clutter/clutter.h>
#include <math.h>
#include <gmodule.h>
#include <string.h>
#define N_FIREWORKS 32
/* Units per second per second */
#define GRAVITY -1.5f
#define N_SPARKS (N_FIREWORKS * 32) /* Must be a power of two */
#define TIME_PER_SPARK 0.01f /* in seconds */
#define TEXTURE_SIZE 32
typedef struct _Firework Firework;
struct _Firework
{
float size;
float x, y;
float start_x, start_y;
ClutterColor color;
/* Velocities are in units per second */
float initial_x_velocity;
float initial_y_velocity;
GTimer *timer;
};
typedef struct _Spark Spark;
struct _Spark
{
float x, y;
ClutterColor color;
ClutterColor base_color;
};
typedef struct _Data Data;
struct _Data
{
Firework fireworks[N_FIREWORKS];
int next_spark_num;
Spark sparks[N_SPARKS];
GTimer *last_spark_time;
CoglMaterial *material;
};
static CoglHandle
generate_round_texture (void)
{
guint8 *p, *data;
int x, y;
CoglHandle tex;
p = data = g_malloc (TEXTURE_SIZE * TEXTURE_SIZE * 4);
/* Generate a yellow circle which gets transparent towards the edges */
for (y = 0; y < TEXTURE_SIZE; y++)
for (x = 0; x < TEXTURE_SIZE; x++)
{
int dx = x - TEXTURE_SIZE / 2;
int dy = y - TEXTURE_SIZE / 2;
float value = sqrtf (dx * dx + dy * dy) * 255.0 / (TEXTURE_SIZE / 2);
if (value > 255.0f)
value = 255.0f;
value = 255.0f - value;
*(p++) = value;
*(p++) = value;
*(p++) = value;
*(p++) = value;
}
tex = cogl_texture_new_from_data (TEXTURE_SIZE, TEXTURE_SIZE,
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
COGL_PIXEL_FORMAT_ANY,
TEXTURE_SIZE * 4,
data);
g_free (data);
return tex;
}
static void
paint_cb (ClutterActor *stage, Data *data)
{
CoglMatrix old_matrix, new_matrix;
int i;
float diff_time;
CoglHandle vbo;
cogl_get_projection_matrix (&old_matrix);
/* Use an orthogonal projection from -1 -> 1 in both axes */
cogl_matrix_init_identity (&new_matrix);
cogl_set_projection_matrix (&new_matrix);
cogl_push_matrix ();
cogl_set_modelview_matrix (&new_matrix);
/* Update all of the firework's positions */
for (i = 0; i < N_FIREWORKS; i++)
{
Firework *firework = data->fireworks + i;
if ((fabsf (firework->x - firework->start_x) > 2.0f) ||
firework->y < -1.0f)
{
firework->size = g_random_double_range (0.001f, 0.1f);
firework->start_x = 1.0f + firework->size;
firework->start_y = -1.0f;
firework->initial_x_velocity = g_random_double_range (-0.1f, -2.0f);
firework->initial_y_velocity = g_random_double_range (0.1f, 4.0f);
g_timer_reset (firework->timer);
/* Pick a random color out of six */
if (g_random_boolean ())
{
memset (&firework->color, 0, sizeof (ClutterColor));
((guint8 *) &firework->color)[g_random_int_range (0, 3)] = 255;
}
else
{
memset (&firework->color, 255, sizeof (ClutterColor));
((guint8 *) &firework->color)[g_random_int_range (0, 3)] = 0;
}
firework->color.alpha = 255;
/* Fire some of the fireworks from the other side */
if (g_random_boolean ())
{
firework->start_x = -firework->start_x;
firework->initial_x_velocity = -firework->initial_x_velocity;
}
}
diff_time = g_timer_elapsed (firework->timer, NULL);
firework->x = (firework->start_x +
firework->initial_x_velocity * diff_time);
firework->y = ((firework->initial_y_velocity * diff_time +
0.5f * GRAVITY * diff_time * diff_time) +
firework->start_y);
}
diff_time = g_timer_elapsed (data->last_spark_time, NULL);
if (diff_time < 0.0f || diff_time >= TIME_PER_SPARK)
{
/* Add a new spark for each firework, overwriting the oldest ones */
for (i = 0; i < N_FIREWORKS; i++)
{
Spark *spark = data->sparks + data->next_spark_num;
Firework *firework = data->fireworks + i;
spark->x = (firework->x +
g_random_double_range (-firework->size / 2.0f,
firework->size / 2.0f));
spark->y = (firework->y +
g_random_double_range (-firework->size / 2.0f,
firework->size / 2.0f));
spark->base_color = firework->color;
data->next_spark_num = (data->next_spark_num + 1) & (N_SPARKS - 1);
}
/* Update the colour of each spark */
for (i = 0; i < N_SPARKS; i++)
{
float color_value;
/* First spark is the oldest */
Spark *spark = data->sparks + ((data->next_spark_num + i)
& (N_SPARKS - 1));
color_value = i / (N_SPARKS - 1.0f);
spark->color.red = spark->base_color.red * color_value;
spark->color.green = spark->base_color.green * color_value;
spark->color.blue = spark->base_color.blue * color_value;
spark->color.alpha = 255.0f * color_value;
}
g_timer_reset (data->last_spark_time);
}
vbo = cogl_vertex_buffer_new (N_SPARKS);
cogl_vertex_buffer_add (vbo, "gl_Vertex", 2,
COGL_ATTRIBUTE_TYPE_FLOAT, FALSE,
sizeof (Spark),
&data->sparks[0].x);
cogl_vertex_buffer_add (vbo, "gl_Color", 4,
COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE, TRUE,
sizeof (Spark),
&data->sparks[0].color.red);
cogl_vertex_buffer_submit (vbo);
cogl_set_source (data->material);
cogl_vertex_buffer_draw (vbo, COGL_VERTICES_MODE_POINTS, 0, N_SPARKS);
cogl_handle_unref (vbo);
cogl_set_projection_matrix (&old_matrix);
cogl_pop_matrix ();
}
static gboolean
idle_cb (gpointer data)
{
clutter_actor_queue_redraw (data);
return TRUE;
}
G_MODULE_EXPORT int
test_cogl_point_sprites_main (int argc, char *argv[])
{
static const ClutterColor black = { 0, 0, 0, 255 };
ClutterActor *stage;
CoglHandle tex;
Data data;
GError *error = NULL;
int i;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
data.material = cogl_material_new ();
data.last_spark_time = g_timer_new ();
data.next_spark_num = 0;
cogl_material_set_point_size (data.material, TEXTURE_SIZE);
tex = generate_round_texture ();
cogl_material_set_layer (data.material, 0, tex);
cogl_handle_unref (tex);
if (!cogl_material_set_layer_point_sprite_coords_enabled (data.material,
0, TRUE,
&error))
{
g_warning ("Failed to enable point sprite coords: %s", error->message);
g_clear_error (&error);
}
for (i = 0; i < N_FIREWORKS; i++)
{
data.fireworks[i].x = -FLT_MAX;
data.fireworks[i].y = FLT_MAX;
data.fireworks[i].size = 0.0f;
data.fireworks[i].timer = g_timer_new ();
}
for (i = 0; i < N_SPARKS; i++)
{
data.sparks[i].x = 2.0f;
data.sparks[i].y = 2.0f;
}
stage = clutter_stage_get_default ();
clutter_stage_set_color (CLUTTER_STAGE (stage), &black);
g_signal_connect_after (stage, "paint", G_CALLBACK (paint_cb), &data);
clutter_actor_show (stage);
g_idle_add (idle_cb, stage);
clutter_main ();
cogl_object_unref (data.material);
g_timer_destroy (data.last_spark_time);
for (i = 0; i < N_FIREWORKS; i++)
g_timer_destroy (data.fireworks[i].timer);
return 0;
}