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mutter/cogl/cogl-atlas.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

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2010,2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-atlas.h"
#include "cogl-rectangle-map.h"
#include "cogl-context-private.h"
#include "cogl-texture-private.h"
#include "cogl-texture-2d-private.h"
#include "cogl-texture-2d-sliced.h"
#include "cogl-texture-driver.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-debug.h"
#include "cogl-framebuffer-private.h"
#include "cogl-blit.h"
#include "cogl-private.h"
#include <stdlib.h>
static void _cogl_atlas_free (CoglAtlas *atlas);
COGL_OBJECT_INTERNAL_DEFINE (Atlas, atlas);
CoglAtlas *
_cogl_atlas_new (CoglPixelFormat texture_format,
CoglAtlasFlags flags,
CoglAtlasUpdatePositionCallback update_position_cb)
{
CoglAtlas *atlas = g_new (CoglAtlas, 1);
atlas->update_position_cb = update_position_cb;
atlas->map = NULL;
atlas->texture = NULL;
atlas->flags = flags;
atlas->texture_format = texture_format;
g_hook_list_init (&atlas->pre_reorganize_callbacks, sizeof (GHook));
g_hook_list_init (&atlas->post_reorganize_callbacks, sizeof (GHook));
return _cogl_atlas_object_new (atlas);
}
static void
_cogl_atlas_free (CoglAtlas *atlas)
{
COGL_NOTE (ATLAS, "%p: Atlas destroyed", atlas);
if (atlas->texture)
cogl_object_unref (atlas->texture);
if (atlas->map)
_cogl_rectangle_map_free (atlas->map);
g_hook_list_clear (&atlas->pre_reorganize_callbacks);
g_hook_list_clear (&atlas->post_reorganize_callbacks);
g_free (atlas);
}
typedef struct _CoglAtlasRepositionData
{
/* The current user data for this texture */
void *user_data;
/* The old and new positions of the texture */
CoglRectangleMapEntry old_position;
CoglRectangleMapEntry new_position;
} CoglAtlasRepositionData;
static void
_cogl_atlas_migrate (CoglAtlas *atlas,
unsigned int n_textures,
CoglAtlasRepositionData *textures,
CoglTexture *old_texture,
CoglTexture *new_texture,
void *skip_user_data)
{
unsigned int i;
CoglBlitData blit_data;
/* If the 'disable migrate' flag is set then we won't actually copy
the textures to their new location. Instead we'll just invoke the
callback to update the position */
if ((atlas->flags & COGL_ATLAS_DISABLE_MIGRATION))
for (i = 0; i < n_textures; i++)
/* Update the texture position */
atlas->update_position_cb (textures[i].user_data,
new_texture,
&textures[i].new_position);
else
{
_cogl_blit_begin (&blit_data, new_texture, old_texture);
for (i = 0; i < n_textures; i++)
{
/* Skip the texture that is being added because it doesn't contain
any data yet */
if (textures[i].user_data != skip_user_data)
_cogl_blit (&blit_data,
textures[i].old_position.x,
textures[i].old_position.y,
textures[i].new_position.x,
textures[i].new_position.y,
textures[i].new_position.width,
textures[i].new_position.height);
/* Update the texture position */
atlas->update_position_cb (textures[i].user_data,
new_texture,
&textures[i].new_position);
}
_cogl_blit_end (&blit_data);
}
}
typedef struct _CoglAtlasGetRectanglesData
{
CoglAtlasRepositionData *textures;
/* Number of textures found so far */
unsigned int n_textures;
} CoglAtlasGetRectanglesData;
static void
_cogl_atlas_get_rectangles_cb (const CoglRectangleMapEntry *rectangle,
void *rect_data,
void *user_data)
{
CoglAtlasGetRectanglesData *data = user_data;
data->textures[data->n_textures].old_position = *rectangle;
data->textures[data->n_textures++].user_data = rect_data;
}
static void
_cogl_atlas_get_next_size (unsigned int *map_width,
unsigned int *map_height)
{
/* Double the size of the texture by increasing whichever dimension
is smaller */
if (*map_width < *map_height)
*map_width <<= 1;
else
*map_height <<= 1;
}
static void
_cogl_atlas_get_initial_size (CoglPixelFormat format,
unsigned int *map_width,
unsigned int *map_height)
{
unsigned int size;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
ctx->driver_vtable->pixel_format_to_gl (ctx,
format,
&gl_intformat,
&gl_format,
&gl_type);
/* At least on Intel hardware, the texture size will be rounded up
to at least 1MB so we might as well try to aim for that as an
initial minimum size. If the format is only 1 byte per pixel we
can use 1024x1024, otherwise we'll assume it will take 4 bytes
per pixel and use 512x512. */
if (_cogl_pixel_format_get_bytes_per_pixel (format) == 1)
size = 1024;
else
size = 512;
/* Some platforms might not support this large size so we'll
decrease the size until it can */
while (size > 1 &&
!ctx->texture_driver->size_supported (ctx,
GL_TEXTURE_2D,
gl_intformat,
gl_format,
gl_type,
size, size))
size >>= 1;
*map_width = size;
*map_height = size;
}
static CoglRectangleMap *
_cogl_atlas_create_map (CoglPixelFormat format,
unsigned int map_width,
unsigned int map_height,
unsigned int n_textures,
CoglAtlasRepositionData *textures)
{
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, NULL);
ctx->driver_vtable->pixel_format_to_gl (ctx,
format,
&gl_intformat,
&gl_format,
&gl_type);
/* Keep trying increasingly larger atlases until we can fit all of
the textures */
while (ctx->texture_driver->size_supported (ctx,
GL_TEXTURE_2D,
gl_intformat,
gl_format,
gl_type,
map_width, map_height))
{
CoglRectangleMap *new_atlas = _cogl_rectangle_map_new (map_width,
map_height,
NULL);
unsigned int i;
COGL_NOTE (ATLAS, "Trying to resize the atlas to %ux%u",
map_width, map_height);
/* Add all of the textures and keep track of the new position */
for (i = 0; i < n_textures; i++)
if (!_cogl_rectangle_map_add (new_atlas,
textures[i].old_position.width,
textures[i].old_position.height,
textures[i].user_data,
&textures[i].new_position))
break;
/* If the atlas can contain all of the textures then we have a
winner */
if (i >= n_textures)
return new_atlas;
else
COGL_NOTE (ATLAS, "Atlas size abandoned after trying "
"%u out of %u textures",
i, n_textures);
_cogl_rectangle_map_free (new_atlas);
_cogl_atlas_get_next_size (&map_width, &map_height);
}
/* If we get here then there's no atlas that can accommodate all of
the rectangles */
return NULL;
}
static CoglTexture2D *
_cogl_atlas_create_texture (CoglAtlas *atlas,
int width,
int height)
{
CoglTexture2D *tex;
CoglError *ignore_error = NULL;
_COGL_GET_CONTEXT (ctx, NULL);
if ((atlas->flags & COGL_ATLAS_CLEAR_TEXTURE))
{
uint8_t *clear_data;
CoglBitmap *clear_bmp;
int bpp = _cogl_pixel_format_get_bytes_per_pixel (atlas->texture_format);
/* Create a buffer of zeroes to initially clear the texture */
clear_data = g_malloc0 (width * height * bpp);
clear_bmp = cogl_bitmap_new_for_data (ctx,
width,
height,
atlas->texture_format,
width * bpp,
clear_data);
tex = cogl_texture_2d_new_from_bitmap (clear_bmp);
_cogl_texture_set_internal_format (COGL_TEXTURE (tex),
atlas->texture_format);
if (!cogl_texture_allocate (COGL_TEXTURE (tex), &ignore_error))
{
cogl_error_free (ignore_error);
cogl_object_unref (tex);
tex = NULL;
}
cogl_object_unref (clear_bmp);
g_free (clear_data);
}
else
{
tex = cogl_texture_2d_new_with_size (ctx, width, height);
_cogl_texture_set_internal_format (COGL_TEXTURE (tex),
atlas->texture_format);
if (!cogl_texture_allocate (COGL_TEXTURE (tex), &ignore_error))
{
cogl_error_free (ignore_error);
cogl_object_unref (tex);
tex = NULL;
}
}
return tex;
}
static int
_cogl_atlas_compare_size_cb (const void *a,
const void *b)
{
const CoglAtlasRepositionData *ta = a;
const CoglAtlasRepositionData *tb = b;
unsigned int a_size, b_size;
a_size = ta->old_position.width * ta->old_position.height;
b_size = tb->old_position.width * tb->old_position.height;
return a_size < b_size ? 1 : a_size > b_size ? -1 : 0;
}
static void
_cogl_atlas_notify_pre_reorganize (CoglAtlas *atlas)
{
g_hook_list_invoke (&atlas->pre_reorganize_callbacks, FALSE);
}
static void
_cogl_atlas_notify_post_reorganize (CoglAtlas *atlas)
{
g_hook_list_invoke (&atlas->post_reorganize_callbacks, FALSE);
}
CoglBool
_cogl_atlas_reserve_space (CoglAtlas *atlas,
unsigned int width,
unsigned int height,
void *user_data)
{
CoglAtlasGetRectanglesData data;
CoglRectangleMap *new_map;
CoglTexture2D *new_tex;
unsigned int map_width, map_height;
CoglBool ret;
CoglRectangleMapEntry new_position;
/* Check if we can fit the rectangle into the existing map */
if (atlas->map &&
_cogl_rectangle_map_add (atlas->map, width, height,
user_data,
&new_position))
{
COGL_NOTE (ATLAS, "%p: Atlas is %ix%i, has %i textures and is %i%% waste",
atlas,
_cogl_rectangle_map_get_width (atlas->map),
_cogl_rectangle_map_get_height (atlas->map),
_cogl_rectangle_map_get_n_rectangles (atlas->map),
/* waste as a percentage */
_cogl_rectangle_map_get_remaining_space (atlas->map) *
100 / (_cogl_rectangle_map_get_width (atlas->map) *
_cogl_rectangle_map_get_height (atlas->map)));
atlas->update_position_cb (user_data,
atlas->texture,
&new_position);
return TRUE;
}
/* If we make it here then we need to reorganize the atlas. First
we'll notify any users of the atlas that this is going to happen
so that for example in CoglAtlasTexture it can notify that the
storage has changed and cause a flush */
_cogl_atlas_notify_pre_reorganize (atlas);
/* Get an array of all the textures currently in the atlas. */
data.n_textures = 0;
if (atlas->map == NULL)
data.textures = g_malloc (sizeof (CoglAtlasRepositionData));
else
{
unsigned int n_rectangles =
_cogl_rectangle_map_get_n_rectangles (atlas->map);
data.textures = g_malloc (sizeof (CoglAtlasRepositionData) *
(n_rectangles + 1));
_cogl_rectangle_map_foreach (atlas->map,
_cogl_atlas_get_rectangles_cb,
&data);
}
/* Add the new rectangle as a dummy texture so that it can be
positioned with the rest */
data.textures[data.n_textures].old_position.x = 0;
data.textures[data.n_textures].old_position.y = 0;
data.textures[data.n_textures].old_position.width = width;
data.textures[data.n_textures].old_position.height = height;
data.textures[data.n_textures++].user_data = user_data;
/* The atlasing algorithm works a lot better if the rectangles are
added in decreasing order of size so we'll first sort the
array */
qsort (data.textures, data.n_textures,
sizeof (CoglAtlasRepositionData),
_cogl_atlas_compare_size_cb);
/* Try to create a new atlas that can contain all of the textures */
if (atlas->map)
{
map_width = _cogl_rectangle_map_get_width (atlas->map);
map_height = _cogl_rectangle_map_get_height (atlas->map);
/* If there is enough space in for the new rectangle in the
existing atlas with at least 6% waste we'll start with the
same size, otherwise we'll immediately double it */
if ((map_width * map_height -
_cogl_rectangle_map_get_remaining_space (atlas->map) +
width * height) * 53 / 50 >
map_width * map_height)
_cogl_atlas_get_next_size (&map_width, &map_height);
}
else
_cogl_atlas_get_initial_size (atlas->texture_format,
&map_width, &map_height);
new_map = _cogl_atlas_create_map (atlas->texture_format,
map_width, map_height,
data.n_textures, data.textures);
/* If we can't create a map with the texture then give up */
if (new_map == NULL)
{
COGL_NOTE (ATLAS, "%p: Could not fit texture in the atlas", atlas);
ret = FALSE;
}
/* We need to migrate the existing textures into a new texture */
else if ((new_tex = _cogl_atlas_create_texture
(atlas,
_cogl_rectangle_map_get_width (new_map),
_cogl_rectangle_map_get_height (new_map))) == NULL)
{
COGL_NOTE (ATLAS, "%p: Could not create a CoglTexture2D", atlas);
_cogl_rectangle_map_free (new_map);
ret = FALSE;
}
else
{
int waste;
COGL_NOTE (ATLAS,
"%p: Atlas %s with size %ix%i",
atlas,
atlas->map == NULL ||
_cogl_rectangle_map_get_width (atlas->map) !=
_cogl_rectangle_map_get_width (new_map) ||
_cogl_rectangle_map_get_height (atlas->map) !=
_cogl_rectangle_map_get_height (new_map) ?
"resized" : "reorganized",
_cogl_rectangle_map_get_width (new_map),
_cogl_rectangle_map_get_height (new_map));
if (atlas->map)
{
/* Move all the textures to the right position in the new
texture. This will also update the texture's rectangle */
_cogl_atlas_migrate (atlas,
data.n_textures,
data.textures,
atlas->texture,
COGL_TEXTURE (new_tex),
user_data);
_cogl_rectangle_map_free (atlas->map);
cogl_object_unref (atlas->texture);
}
else
/* We know there's only one texture so we can just directly
update the rectangle from its new position */
atlas->update_position_cb (data.textures[0].user_data,
COGL_TEXTURE (new_tex),
&data.textures[0].new_position);
atlas->map = new_map;
atlas->texture = COGL_TEXTURE (new_tex);
waste = (_cogl_rectangle_map_get_remaining_space (atlas->map) *
100 / (_cogl_rectangle_map_get_width (atlas->map) *
_cogl_rectangle_map_get_height (atlas->map)));
COGL_NOTE (ATLAS, "%p: Atlas is %ix%i, has %i textures and is %i%% waste",
atlas,
_cogl_rectangle_map_get_width (atlas->map),
_cogl_rectangle_map_get_height (atlas->map),
_cogl_rectangle_map_get_n_rectangles (atlas->map),
waste);
ret = TRUE;
}
g_free (data.textures);
_cogl_atlas_notify_post_reorganize (atlas);
return ret;
}
void
_cogl_atlas_remove (CoglAtlas *atlas,
const CoglRectangleMapEntry *rectangle)
{
_cogl_rectangle_map_remove (atlas->map, rectangle);
COGL_NOTE (ATLAS, "%p: Removed rectangle sized %ix%i",
atlas,
rectangle->width,
rectangle->height);
COGL_NOTE (ATLAS, "%p: Atlas is %ix%i, has %i textures and is %i%% waste",
atlas,
_cogl_rectangle_map_get_width (atlas->map),
_cogl_rectangle_map_get_height (atlas->map),
_cogl_rectangle_map_get_n_rectangles (atlas->map),
_cogl_rectangle_map_get_remaining_space (atlas->map) *
100 / (_cogl_rectangle_map_get_width (atlas->map) *
_cogl_rectangle_map_get_height (atlas->map)));
};
static CoglTexture *
create_migration_texture (CoglContext *ctx,
int width,
int height,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
CoglError *skip_error = NULL;
if ((_cogl_util_is_pot (width) && _cogl_util_is_pot (height)) ||
(cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_BASIC) &&
cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP)))
{
/* First try creating a fast-path non-sliced texture */
tex = COGL_TEXTURE (cogl_texture_2d_new_with_size (ctx,
width, height));
_cogl_texture_set_internal_format (tex, internal_format);
/* TODO: instead of allocating storage here it would be better
* if we had some api that let us just check that the size is
* supported by the hardware so storage could be allocated
* lazily when uploading data. */
if (!cogl_texture_allocate (tex, &skip_error))
{
cogl_error_free (skip_error);
cogl_object_unref (tex);
tex = NULL;
}
}
else
tex = NULL;
if (!tex)
{
CoglTexture2DSliced *tex_2ds =
cogl_texture_2d_sliced_new_with_size (ctx,
width,
height,
COGL_TEXTURE_MAX_WASTE);
_cogl_texture_set_internal_format (COGL_TEXTURE (tex_2ds),
internal_format);
tex = COGL_TEXTURE (tex_2ds);
}
return tex;
}
CoglTexture *
_cogl_atlas_copy_rectangle (CoglAtlas *atlas,
int x,
int y,
int width,
int height,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
CoglBlitData blit_data;
CoglError *ignore_error = NULL;
_COGL_GET_CONTEXT (ctx, NULL);
/* Create a new texture at the right size */
tex = create_migration_texture (ctx, width, height, internal_format);
if (!cogl_texture_allocate (tex, &ignore_error))
{
cogl_error_free (ignore_error);
cogl_object_unref (tex);
return NULL;
}
/* Blit the data out of the atlas to the new texture. If FBOs
aren't available this will end up having to copy the entire
atlas texture */
_cogl_blit_begin (&blit_data, tex, atlas->texture);
_cogl_blit (&blit_data,
x, y,
0, 0,
width, height);
_cogl_blit_end (&blit_data);
return tex;
}
void
_cogl_atlas_add_reorganize_callback (CoglAtlas *atlas,
GHookFunc pre_callback,
GHookFunc post_callback,
void *user_data)
{
if (pre_callback)
{
GHook *hook = g_hook_alloc (&atlas->post_reorganize_callbacks);
hook->func = pre_callback;
hook->data = user_data;
g_hook_prepend (&atlas->pre_reorganize_callbacks, hook);
}
if (post_callback)
{
GHook *hook = g_hook_alloc (&atlas->pre_reorganize_callbacks);
hook->func = post_callback;
hook->data = user_data;
g_hook_prepend (&atlas->post_reorganize_callbacks, hook);
}
}
void
_cogl_atlas_remove_reorganize_callback (CoglAtlas *atlas,
GHookFunc pre_callback,
GHookFunc post_callback,
void *user_data)
{
if (pre_callback)
{
GHook *hook = g_hook_find_func_data (&atlas->pre_reorganize_callbacks,
FALSE,
pre_callback,
user_data);
if (hook)
g_hook_destroy_link (&atlas->pre_reorganize_callbacks, hook);
}
if (post_callback)
{
GHook *hook = g_hook_find_func_data (&atlas->post_reorganize_callbacks,
FALSE,
post_callback,
user_data);
if (hook)
g_hook_destroy_link (&atlas->post_reorganize_callbacks, hook);
}
}
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