mirror of
https://github.com/brl/mutter.git
synced 2024-11-22 08:00:42 -05:00
Add a cogl-point-sprites example
This updates the old point sprites interactive test from Clutter to be a standalone Cogl example using the 2.0 API. (cherry picked from commit e7ede458fde7207896e507d64b52b77777b3c872)
This commit is contained in:
Neil Roberts
parent
99352e1149
commit
cd9291f511
@ -33,7 +33,7 @@ cogl_info_SOURCES = cogl-info.c
|
||||
cogl_info_LDADD = $(common_ldadd)
|
||||
|
||||
if USE_GLIB
|
||||
programs += cogl-hello cogl-msaa cogl-gles2-context
|
||||
programs += cogl-hello cogl-msaa cogl-gles2-context cogl-point-sprites
|
||||
examples_datadir = $(pkgdatadir)/examples-data
|
||||
examples_data_DATA =
|
||||
|
||||
@ -41,6 +41,8 @@ cogl_hello_SOURCES = cogl-hello.c
|
||||
cogl_hello_LDADD = $(common_ldadd)
|
||||
cogl_msaa_SOURCES = cogl-msaa.c
|
||||
cogl_msaa_LDADD = $(common_ldadd)
|
||||
cogl_point_sprites_SOURCES = cogl-point-sprites.c
|
||||
cogl_point_sprites_LDADD = $(common_ldadd)
|
||||
|
||||
if BUILD_COGL_PANGO
|
||||
programs += cogl-crate
|
||||
|
||||
324
examples/cogl-point-sprites.c
Normal file
324
examples/cogl-point-sprites.c
Normal file
@ -0,0 +1,324 @@
|
||||
#include <cogl/cogl.h>
|
||||
#include <glib.h>
|
||||
#include <stdlib.h>
|
||||
#include <math.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
|
||||
{
|
||||
uint8_t red, green, blue, alpha;
|
||||
} Color;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
float size;
|
||||
float x, y;
|
||||
float start_x, start_y;
|
||||
Color color;
|
||||
|
||||
/* Velocities are in units per second */
|
||||
float initial_x_velocity;
|
||||
float initial_y_velocity;
|
||||
|
||||
GTimer *timer;
|
||||
} Firework;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
float x, y;
|
||||
Color color;
|
||||
Color base_color;
|
||||
} Spark;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
Firework fireworks[N_FIREWORKS];
|
||||
|
||||
int next_spark_num;
|
||||
Spark sparks[N_SPARKS];
|
||||
GTimer *last_spark_time;
|
||||
|
||||
CoglContext *context;
|
||||
CoglFramebuffer *fb;
|
||||
CoglPipeline *pipeline;
|
||||
CoglPrimitive *primitive;
|
||||
CoglAttributeBuffer *attribute_buffer;
|
||||
} Data;
|
||||
|
||||
static CoglTexture *
|
||||
generate_round_texture (CoglContext *context)
|
||||
{
|
||||
uint8_t *p, *data;
|
||||
int x, y;
|
||||
CoglTexture2D *tex;
|
||||
|
||||
p = data = g_malloc (TEXTURE_SIZE * TEXTURE_SIZE * 4);
|
||||
|
||||
/* Generate a white 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_2d_new_from_data (context,
|
||||
TEXTURE_SIZE, TEXTURE_SIZE,
|
||||
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
|
||||
COGL_PIXEL_FORMAT_ANY,
|
||||
TEXTURE_SIZE * 4,
|
||||
data,
|
||||
NULL /* error */);
|
||||
|
||||
g_free (data);
|
||||
|
||||
return COGL_TEXTURE (tex);
|
||||
}
|
||||
|
||||
static void
|
||||
paint (Data *data)
|
||||
{
|
||||
int i;
|
||||
float diff_time;
|
||||
|
||||
/* 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 (Color));
|
||||
((uint8_t *) &firework->color)[g_random_int_range (0, 3)] = 255;
|
||||
}
|
||||
else
|
||||
{
|
||||
memset (&firework->color, 255, sizeof (Color));
|
||||
((uint8_t *) &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);
|
||||
}
|
||||
|
||||
cogl_buffer_set_data (COGL_BUFFER (data->attribute_buffer),
|
||||
0, /* offset */
|
||||
data->sparks,
|
||||
sizeof (data->sparks));
|
||||
|
||||
cogl_framebuffer_clear4f (data->fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
|
||||
|
||||
cogl_primitive_draw (data->primitive,
|
||||
data->fb,
|
||||
data->pipeline);
|
||||
|
||||
cogl_onscreen_swap_buffers (COGL_ONSCREEN (data->fb));
|
||||
}
|
||||
|
||||
static void
|
||||
create_primitive (Data *data)
|
||||
{
|
||||
CoglAttribute *attributes[2];
|
||||
int i;
|
||||
|
||||
data->attribute_buffer =
|
||||
cogl_attribute_buffer_new_with_size (data->context,
|
||||
sizeof (data->sparks));
|
||||
cogl_buffer_set_update_hint (COGL_BUFFER (data->attribute_buffer),
|
||||
COGL_BUFFER_UPDATE_HINT_DYNAMIC);
|
||||
|
||||
attributes[0] = cogl_attribute_new (data->attribute_buffer,
|
||||
"cogl_position_in",
|
||||
sizeof (Spark),
|
||||
G_STRUCT_OFFSET (Spark, x),
|
||||
2, /* n_components */
|
||||
COGL_ATTRIBUTE_TYPE_FLOAT);
|
||||
attributes[1] = cogl_attribute_new (data->attribute_buffer,
|
||||
"cogl_color_in",
|
||||
sizeof (Spark),
|
||||
G_STRUCT_OFFSET (Spark, color),
|
||||
4, /* n_components */
|
||||
COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE);
|
||||
|
||||
data->primitive =
|
||||
cogl_primitive_new_with_attributes (COGL_VERTICES_MODE_POINTS,
|
||||
N_SPARKS,
|
||||
attributes,
|
||||
G_N_ELEMENTS (attributes));
|
||||
|
||||
for (i = 0; i < G_N_ELEMENTS (attributes); i++)
|
||||
cogl_object_unref (attributes[i]);
|
||||
}
|
||||
|
||||
static void
|
||||
frame_event_cb (CoglOnscreen *onscreen,
|
||||
CoglFrameEvent event,
|
||||
CoglFrameInfo *info,
|
||||
void *user_data)
|
||||
{
|
||||
Data *data = user_data;
|
||||
|
||||
if (event == COGL_FRAME_EVENT_SYNC)
|
||||
paint (data);
|
||||
}
|
||||
|
||||
int
|
||||
main (int argc, char *argv[])
|
||||
{
|
||||
CoglTexture *tex;
|
||||
CoglOnscreen *onscreen;
|
||||
GSource *cogl_source;
|
||||
GMainLoop *loop;
|
||||
Data data;
|
||||
int i;
|
||||
|
||||
data.context = cogl_context_new (NULL, NULL);
|
||||
|
||||
create_primitive (&data);
|
||||
|
||||
data.pipeline = cogl_pipeline_new (data.context);
|
||||
data.last_spark_time = g_timer_new ();
|
||||
data.next_spark_num = 0;
|
||||
cogl_pipeline_set_point_size (data.pipeline, TEXTURE_SIZE);
|
||||
|
||||
tex = generate_round_texture (data.context);
|
||||
cogl_pipeline_set_layer_texture (data.pipeline, 0, tex);
|
||||
cogl_object_unref (tex);
|
||||
|
||||
cogl_pipeline_set_layer_point_sprite_coords_enabled (data.pipeline,
|
||||
0, /* layer */
|
||||
TRUE,
|
||||
NULL /* 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;
|
||||
}
|
||||
|
||||
onscreen = cogl_onscreen_new (data.context, 800, 600);
|
||||
cogl_onscreen_show (onscreen);
|
||||
data.fb = COGL_FRAMEBUFFER (onscreen);
|
||||
|
||||
cogl_source = cogl_glib_source_new (data.context, G_PRIORITY_DEFAULT);
|
||||
|
||||
g_source_attach (cogl_source, NULL);
|
||||
|
||||
cogl_onscreen_add_frame_callback (onscreen,
|
||||
frame_event_cb,
|
||||
&data,
|
||||
NULL /* destroy notify */);
|
||||
|
||||
loop = g_main_loop_new (NULL, TRUE);
|
||||
|
||||
paint (&data);
|
||||
|
||||
g_main_loop_run (loop);
|
||||
|
||||
g_main_loop_unref (loop);
|
||||
|
||||
g_source_destroy (cogl_source);
|
||||
|
||||
cogl_object_unref (data.pipeline);
|
||||
cogl_object_unref (data.attribute_buffer);
|
||||
cogl_object_unref (data.primitive);
|
||||
cogl_object_unref (onscreen);
|
||||
cogl_object_unref (data.context);
|
||||
|
||||
g_timer_destroy (data.last_spark_time);
|
||||
|
||||
for (i = 0; i < N_FIREWORKS; i++)
|
||||
g_timer_destroy (data.fireworks[i].timer);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user