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mutter/tests/conform/test-cogl-sub-texture.c
Neil Roberts 4be4f56bdf cogl-sub-texture: Optimise taking a sub texture of a sub texture 
When creating a Cogl sub-texture, if the full texture is also a sub
texture it will now just offset the x and y and reference the full
texture instead. This avoids one level of indirection when rendering
the texture which reduces the chances of getting rounding errors in
the calculations.
2010-02-12 16:57:17 +00:00

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#include <clutter/clutter.h>
#include <cogl/cogl.h>
#include <string.h>
#include "test-conform-common.h"
#define SOURCE_SIZE 32
#define SOURCE_DIVISIONS_X 2
#define SOURCE_DIVISIONS_Y 2
#define DIVISION_WIDTH (SOURCE_SIZE / SOURCE_DIVISIONS_X)
#define DIVISION_HEIGHT (SOURCE_SIZE / SOURCE_DIVISIONS_Y)
#define TEST_INSET 1
static const ClutterColor
corner_colors[SOURCE_DIVISIONS_X * SOURCE_DIVISIONS_Y] =
{
{ 0xff, 0x00, 0x00, 0xff }, /* red top left */
{ 0x00, 0xff, 0x00, 0xff }, /* green top right */
{ 0x00, 0x00, 0xff, 0xff }, /* blue bottom left */
{ 0xff, 0x00, 0xff, 0xff } /* purple bottom right */
};
static const ClutterColor stage_color = { 0x0, 0x0, 0x0, 0xff };
typedef struct _TestState
{
ClutterActor *stage;
guint frame;
CoglHandle tex;
} TestState;
static CoglHandle
create_source (void)
{
int dx, dy;
guchar *data = g_malloc (SOURCE_SIZE * SOURCE_SIZE * 4);
/* Create a texture with a different coloured rectangle at each
corner */
for (dy = 0; dy < SOURCE_DIVISIONS_Y; dy++)
for (dx = 0; dx < SOURCE_DIVISIONS_X; dx++)
{
guchar *p = (data + dy * DIVISION_HEIGHT * SOURCE_SIZE * 4 +
dx * DIVISION_WIDTH * 4);
int x, y;
for (y = 0; y < DIVISION_HEIGHT; y++)
{
for (x = 0; x < DIVISION_WIDTH; x++)
{
memcpy (p, corner_colors + dx + dy * SOURCE_DIVISIONS_X, 4);
p += 4;
}
p += SOURCE_SIZE * 4 - DIVISION_WIDTH * 4;
}
}
return cogl_texture_new_from_data (SOURCE_SIZE, SOURCE_SIZE,
COGL_TEXTURE_NONE,
COGL_PIXEL_FORMAT_RGBA_8888,
COGL_PIXEL_FORMAT_ANY,
SOURCE_SIZE * 4,
data);
}
static CoglHandle
create_test_texture (void)
{
CoglHandle tex;
guint8 *data = g_malloc (256 * 256 * 4), *p = data;
int x, y;
/* Create a texture that is 256x256 where the red component ranges
from 0->255 along the x axis and the green component ranges from
0->255 along the y axis. The blue and alpha components are all
255 */
for (y = 0; y < 256; y++)
for (x = 0; x < 256; x++)
{
*(p++) = x;
*(p++) = y;
*(p++) = 255;
*(p++) = 255;
}
tex = cogl_texture_new_from_data (256, 256, COGL_TEXTURE_NONE,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
COGL_PIXEL_FORMAT_ANY,
256 * 4,
data);
g_free (data);
return tex;
}
static void
draw_frame (TestState *state)
{
CoglHandle full_texture, sub_texture, sub_sub_texture;
/* Create a sub texture of the bottom right quarter of the texture */
sub_texture = cogl_texture_new_from_sub_texture (state->tex,
DIVISION_WIDTH,
DIVISION_HEIGHT,
DIVISION_WIDTH,
DIVISION_HEIGHT);
/* Paint it */
cogl_set_source_texture (sub_texture);
cogl_rectangle (0.0f, 0.0f, DIVISION_WIDTH, DIVISION_HEIGHT);
cogl_handle_unref (sub_texture);
/* Repeat a sub texture of the top half of the full texture. This is
documented to be undefined so it doesn't technically have to work
but it will with the current implementation */
sub_texture = cogl_texture_new_from_sub_texture (state->tex,
0, 0,
SOURCE_SIZE,
DIVISION_HEIGHT);
cogl_set_source_texture (sub_texture);
cogl_rectangle_with_texture_coords (0.0f, SOURCE_SIZE,
SOURCE_SIZE * 2.0f, SOURCE_SIZE * 1.5f,
0.0f, 0.0f,
2.0f, 1.0f);
cogl_handle_unref (sub_texture);
/* Create a sub texture of a sub texture */
full_texture = create_test_texture ();
sub_texture = cogl_texture_new_from_sub_texture (full_texture,
20, 10, 30, 20);
sub_sub_texture = cogl_texture_new_from_sub_texture (sub_texture,
20, 10, 10, 10);
cogl_set_source_texture (sub_sub_texture);
cogl_rectangle (0.0f, SOURCE_SIZE * 2.0f,
10.0f, SOURCE_SIZE * 2.0f + 10.0f);
cogl_handle_unref (sub_sub_texture);
cogl_handle_unref (sub_texture);
cogl_handle_unref (full_texture);
}
static gboolean
validate_part (TestState *state,
int xpos, int ypos,
int width, int height,
const ClutterColor *color)
{
int x, y;
gboolean pass = TRUE;
guchar *pixels, *p;
p = pixels = clutter_stage_read_pixels (CLUTTER_STAGE (state->stage),
xpos + TEST_INSET,
ypos + TEST_INSET,
width - TEST_INSET - 2,
height - TEST_INSET - 2);
/* Check whether the center of each division is the right color */
for (y = 0; y < height - TEST_INSET - 2; y++)
for (x = 0; x < width - TEST_INSET - 2; x++)
{
if (p[0] != color->red ||
p[1] != color->green ||
p[2] != color->blue)
pass = FALSE;
p += 4;
}
return pass;
}
static guint8 *
create_update_data (void)
{
guint8 *data = g_malloc (256 * 256 * 4), *p = data;
int x, y;
/* Create some image data that is 256x256 where the blue component
ranges from 0->255 along the x axis and the alpha component
ranges from 0->255 along the y axis. The red and green components
are all zero */
for (y = 0; y < 256; y++)
for (x = 0; x < 256; x++)
{
*(p++) = 0;
*(p++) = 0;
*(p++) = x;
*(p++) = y;
}
return data;
}
static void
validate_result (TestState *state)
{
int i, division_num, x, y;
CoglHandle sub_texture, test_tex;
guchar *texture_data, *p;
gint tex_width, tex_height;
/* Sub texture of the bottom right corner of the texture */
g_assert (validate_part (state, 0, 0, DIVISION_WIDTH, DIVISION_HEIGHT,
corner_colors +
(SOURCE_DIVISIONS_Y - 1) * SOURCE_DIVISIONS_X +
SOURCE_DIVISIONS_X - 1));
/* Sub texture of the top half repeated horizontally */
for (i = 0; i < 2; i++)
for (division_num = 0; division_num < SOURCE_DIVISIONS_X; division_num++)
g_assert (validate_part (state,
i * SOURCE_SIZE + division_num * DIVISION_WIDTH,
SOURCE_SIZE,
DIVISION_WIDTH, DIVISION_HEIGHT,
corner_colors + division_num));
/* Sub sub texture */
p = texture_data = clutter_stage_read_pixels (CLUTTER_STAGE (state->stage),
0, SOURCE_SIZE * 2, 10, 10);
for (y = 0; y < 10; y++)
for (x = 0; x < 10; x++)
{
g_assert (*(p++) == x + 40);
g_assert (*(p++) == y + 20);
p += 2;
}
g_free (texture_data);
/* Try reading back the texture data */
sub_texture = cogl_texture_new_from_sub_texture (state->tex,
SOURCE_SIZE / 4,
SOURCE_SIZE / 4,
SOURCE_SIZE / 2,
SOURCE_SIZE / 2);
tex_width = cogl_texture_get_width (sub_texture);
tex_height = cogl_texture_get_height (sub_texture);
p = texture_data = g_malloc (tex_width * tex_height * 4);
cogl_texture_get_data (sub_texture, COGL_PIXEL_FORMAT_RGBA_8888,
tex_width * 4,
texture_data);
for (y = 0; y < tex_height; y++)
for (x = 0; x < tex_width; x++)
{
int div_x = ((x * SOURCE_SIZE / 2 / tex_width + SOURCE_SIZE / 4) /
DIVISION_WIDTH);
int div_y = ((y * SOURCE_SIZE / 2 / tex_height + SOURCE_SIZE / 4) /
DIVISION_HEIGHT);
const ClutterColor *color = (corner_colors + div_x +
div_y * SOURCE_DIVISIONS_X);
g_assert (p[0] == color->red);
g_assert (p[1] == color->green);
g_assert (p[2] == color->blue);
p += 4;
}
g_free (texture_data);
cogl_handle_unref (sub_texture);
/* Create a 256x256 test texture */
test_tex = create_test_texture ();
/* Create a sub texture the views the center half of the texture */
sub_texture = cogl_texture_new_from_sub_texture (test_tex,
64, 64, 128, 128);
/* Update the center half of the sub texture */
texture_data = create_update_data ();
cogl_texture_set_region (sub_texture, 0, 0, 32, 32, 64, 64, 256, 256,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, 256 * 4,
texture_data);
g_free (texture_data);
cogl_handle_unref (sub_texture);
/* Get the texture data */
p = texture_data = g_malloc (256 * 256 * 4);
cogl_texture_get_data (test_tex, COGL_PIXEL_FORMAT_RGBA_8888,
256 * 4, texture_data);
/* Verify the texture data */
for (y = 0; y < 256; y++)
for (x = 0; x < 256; x++)
{
/* If we're in the center quarter */
if (x >= 96 && x < 160 && y >= 96 && y < 160)
{
g_assert ((*p++) == 0);
g_assert ((*p++) == 0);
g_assert ((*p++) == x - 96);
g_assert ((*p++) == y - 96);
}
else
{
g_assert ((*p++) == x);
g_assert ((*p++) == y);
g_assert ((*p++) == 255);
g_assert ((*p++) == 255);
}
}
g_free (texture_data);
cogl_handle_unref (test_tex);
/* Comment this out to see what the test paints */
clutter_main_quit ();
}
static void
on_paint (ClutterActor *actor, TestState *state)
{
int frame_num;
draw_frame (state);
/* XXX: Experiments have shown that for some buggy drivers, when using
* glReadPixels there is some kind of race, so we delay our test for a
* few frames and a few seconds:
*/
/* Need to increment frame first because clutter_stage_read_pixels
fires a redraw */
frame_num = state->frame++;
if (frame_num == 2)
validate_result (state);
else if (frame_num < 2)
g_usleep (G_USEC_PER_SEC);
}
static gboolean
queue_redraw (gpointer stage)
{
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
return TRUE;
}
void
test_cogl_sub_texture (TestConformSimpleFixture *fixture,
gconstpointer data)
{
TestState state;
guint idle_source;
guint paint_handler;
state.frame = 0;
state.stage = clutter_stage_get_default ();
state.tex = create_source ();
clutter_stage_set_color (CLUTTER_STAGE (state.stage), &stage_color);
/* We force continuous redrawing of the stage, since we need to skip
* the first few frames, and we wont be doing anything else that
* will trigger redrawing. */
idle_source = g_idle_add (queue_redraw, state.stage);
paint_handler = g_signal_connect_after (state.stage, "paint",
G_CALLBACK (on_paint), &state);
clutter_actor_show_all (state.stage);
clutter_main ();
g_source_remove (idle_source);
g_signal_handler_disconnect (state.stage, paint_handler);
cogl_handle_unref (state.tex);
/* Remove all of the actors from the stage */
clutter_container_foreach (CLUTTER_CONTAINER (state.stage),
(ClutterCallback) clutter_actor_destroy,
NULL);
if (g_test_verbose ())
g_print ("OK\n");
}
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