/* * Cogl * * An object oriented GL/GLES Abstraction/Utility Layer * * Copyright (C) 2010 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 */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "cogl.h" #include "cogl-atlas.h" #include "cogl-rectangle-map.h" #include "cogl-context.h" #include "cogl-texture-private.h" #include "cogl-texture-2d-private.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 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; _cogl_callback_list_init (&atlas->reorganize_callbacks); return _cogl_atlas_object_new (atlas); } static void _cogl_atlas_free (CoglAtlas *atlas) { COGL_NOTE (ATLAS, "%p: Atlas destroyed", atlas); if (atlas->texture) cogl_handle_unref (atlas->texture); if (atlas->map) _cogl_rectangle_map_free (atlas->map); _cogl_callback_list_destroy (&atlas->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, CoglHandle old_texture, CoglHandle 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_type; _cogl_pixel_format_to_gl (format, &gl_intformat, NULL, /* 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_get_format_bpp (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 && !_cogl_texture_driver_size_supported (GL_TEXTURE_2D, gl_intformat, 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_type; _cogl_pixel_format_to_gl (format, &gl_intformat, NULL, /* gl_format */ &gl_type); /* Keep trying increasingly larger atlases until we can fit all of the textures */ while (_cogl_texture_driver_size_supported (GL_TEXTURE_2D, gl_intformat, 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 CoglHandle _cogl_atlas_create_texture (CoglAtlas *atlas, int width, int height) { CoglHandle tex; if ((atlas->flags & COGL_ATLAS_CLEAR_TEXTURE)) { guint8 *clear_data; CoglBitmap *clear_bmp; int bpp = _cogl_get_format_bpp (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_from_data (clear_data, atlas->texture_format, width, height, width * bpp, (CoglBitmapDestroyNotify) g_free, NULL); tex = _cogl_texture_2d_new_from_bitmap (clear_bmp, COGL_TEXTURE_NONE, atlas->texture_format); cogl_object_unref (clear_bmp); } else tex = _cogl_texture_2d_new_with_size (width, height, COGL_TEXTURE_NONE, atlas->texture_format); 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_reorganize (CoglAtlas *atlas) { _cogl_callback_list_invoke (&atlas->reorganize_callbacks); } gboolean _cogl_atlas_reserve_space (CoglAtlas *atlas, unsigned int width, unsigned int height, void *user_data) { CoglAtlasGetRectanglesData data; CoglRectangleMap *new_map; CoglHandle new_tex; unsigned int map_width, map_height; gboolean 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)) { int 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); atlas->update_position_cb (user_data, atlas->texture, &new_position); return TRUE; } /* We need to reorganise the atlas so we'll 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))) == COGL_INVALID_HANDLE) { COGL_NOTE (ATLAS, "%p: Could not create a CoglTexture2D", atlas); _cogl_rectangle_map_free (new_map); ret = FALSE; } else { int waste; _cogl_atlas_notify_reorganize (atlas); 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, new_tex, user_data); _cogl_rectangle_map_free (atlas->map); cogl_handle_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, new_tex, &data.textures[0].new_position); atlas->map = new_map; atlas->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); 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))); }; CoglHandle _cogl_atlas_copy_rectangle (CoglAtlas *atlas, unsigned int x, unsigned int y, unsigned int width, unsigned int height, CoglTextureFlags flags, CoglPixelFormat format) { CoglHandle tex; CoglBlitData blit_data; /* Create a new texture at the right size */ tex = cogl_texture_new_with_size (width, height, flags, format); /* 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, CoglCallbackListFunc callback, void *user_data) { _cogl_callback_list_add (&atlas->reorganize_callbacks, callback, user_data); } void _cogl_atlas_remove_reorganize_callback (CoglAtlas *atlas, CoglCallbackListFunc callback, void *user_data) { _cogl_callback_list_remove (&atlas->reorganize_callbacks, callback, user_data); }