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mutter-performance-source/examples/cogl-point-sprites.c
Robert Bragg af7398788a remove internal_format and redundant error arguments
Texture allocation is now consistently handled lazily such that the
internal format can now be controlled using
cogl_texture_set_components() and cogl_texture_set_premultiplied()
before allocating the texture with cogl_texture_allocate(). This means
that the internal_format arguments to texture constructors are now
redundant and since most of the texture constructors now can't ever fail
the error arguments are also redundant. This now means we no longer
use CoglPixelFormat in the public api for describing the internal format
of textures which had been bad solution originally due to how specific
CoglPixelFormat is which is missleading when we don't support such
explicit control over the internal format.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 99a53c82e9ab0a1e5ee35941bf83dc334b1fbe87)

Note: there are numerous API changes for functions currently marked
as 'unstable' which we don't think are in use by anyone depending on
a stable 1.x api. Compared to the original patch though this avoids
changing the cogl_texture_rectangle_new_with_size() api which we know
is used by Mutter.
2014-01-09 15:49:47 +00:00

323 lines
9.2 KiB
C

#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,
TEXTURE_SIZE * 4,
data,
NULL /* error */);
g_free (data);
return 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 (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 (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 (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 = 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;
}