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