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/* gskngltexturelibraryprivate.h
*
* Copyright 2020 Christian Hergert <chergert@redhat.com>
*
* This file 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 2.1 of the License, or (at your option)
* any later version.
*
* This file 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 General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifndef __GSK_NGL_TEXTURE_LIBRARY_PRIVATE_H__
#define __GSK_NGL_TEXTURE_LIBRARY_PRIVATE_H__
#include "gskngltypesprivate.h"
#include "gskngltextureprivate.h"
#include "stb_rect_pack.h"
G_BEGIN_DECLS
#define GSK_TYPE_GL_TEXTURE_LIBRARY (gsk_ngl_texture_library_get_type ())
#define GSK_NGL_TEXTURE_LIBRARY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GSK_TYPE_GL_TEXTURE_LIBRARY, GskNglTextureLibrary))
#define GSK_IS_NGL_TEXTURE_LIBRARY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GSK_TYPE_GL_TEXTURE_LIBRARY))
#define GSK_NGL_TEXTURE_LIBRARY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GSK_TYPE_GL_TEXTURE_LIBRARY, GskNglTextureLibraryClass))
#define GSK_IS_NGL_TEXTURE_LIBRARY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GSK_TYPE_GL_TEXTURE_LIBRARY))
#define GSK_NGL_TEXTURE_LIBRARY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GSK_TYPE_GL_TEXTURE_LIBRARY, GskNglTextureLibraryClass))
typedef struct _GskNglTextureAtlas
{
struct stbrp_context context;
struct stbrp_node *nodes;
int width;
int height;
guint texture_id;
/* Pixels of rects that have been used at some point,
* But are now unused.
*/
int unused_pixels;
void *user_data;
} GskNglTextureAtlas;
typedef struct _GskNglTextureAtlasEntry
{
/* A backreference to either the atlas or texture containing
* the contents of the atlas entry. For larger items, no atlas
* is used and instead a direct texture.
*/
union {
GskNglTextureAtlas *atlas;
GskNglTexture *texture;
};
/* The area within the atlas translated to 0..1 bounds */
struct {
float x;
float y;
float x2;
float y2;
} area;
/* Number of pixels in the entry, used to calculate usage
* of an atlas while processing.
*/
guint n_pixels : 29;
/* If entry has marked pixels as used in the atlas this frame */
guint used : 1;
/* If entry was accessed this frame */
guint accessed : 1;
/* When true, backref is an atlas, otherwise texture */
guint is_atlased : 1;
} GskNglTextureAtlasEntry;
typedef struct _GskNglTextureLibrary
{
GObject parent_instance;
GskNglDriver *driver;
GHashTable *hash_table;
guint max_entry_size;
} GskNglTextureLibrary;
typedef struct _GskNglTextureLibraryClass
{
GObjectClass parent_class;
void (*begin_frame) (GskNglTextureLibrary *library,
gint64 frame_id,
GPtrArray *removed_atlases);
} GskNglTextureLibraryClass;
G_DEFINE_AUTOPTR_CLEANUP_FUNC (GskNglTextureLibrary, g_object_unref)
GType gsk_ngl_texture_library_get_type (void) G_GNUC_CONST;
void gsk_ngl_texture_library_set_funcs (GskNglTextureLibrary *self,
GHashFunc hash_func,
GEqualFunc equal_func,
GDestroyNotify key_destroy,
GDestroyNotify value_destroy);
void gsk_ngl_texture_library_begin_frame (GskNglTextureLibrary *self,
gint64 frame_id,
GPtrArray *removed_atlases);
gpointer gsk_ngl_texture_library_pack (GskNglTextureLibrary *self,
gpointer key,
gsize valuelen,
guint width,
guint height,
int padding,
guint *out_packed_x,
guint *out_packed_y);
static inline void
gsk_ngl_texture_atlas_mark_unused (GskNglTextureAtlas *self,
int n_pixels)
{
g_assert (n_pixels >= 0);
self->unused_pixels += n_pixels;
}
static inline void
gsk_ngl_texture_atlas_entry_mark_used (GskNglTextureAtlasEntry *entry)
{
if (entry->used == TRUE || entry->is_atlased == FALSE)
return;
entry->atlas->unused_pixels -= entry->n_pixels;
entry->used = TRUE;
}
static inline void
gsk_ngl_texture_atlas_entry_mark_unused (GskNglTextureAtlasEntry *entry)
{
if (entry->used == FALSE || entry->is_atlased == FALSE)
return;
entry->atlas->unused_pixels += entry->n_pixels;
entry->used = FALSE;
}
static inline gboolean
gsk_ngl_texture_library_lookup (GskNglTextureLibrary *self,
gconstpointer key,
GskNglTextureAtlasEntry **out_entry)
{
GskNglTextureAtlasEntry *entry = g_hash_table_lookup (self->hash_table, key);
if G_LIKELY (entry != NULL && entry->accessed && entry->used)
{
*out_entry = entry;
return TRUE;
}
if (entry != NULL)
{
gsk_ngl_texture_atlas_entry_mark_used (entry);
entry->accessed = TRUE;
*out_entry = entry;
return TRUE;
}
return FALSE;
}
static inline guint
GSK_NGL_TEXTURE_ATLAS_ENTRY_TEXTURE (gconstpointer d)
{
const GskNglTextureAtlasEntry *e = d;
return e->is_atlased ? e->atlas->texture_id
: e->texture ? e->texture->texture_id : 0;
}
static inline double
gsk_ngl_texture_atlas_get_unused_ratio (const GskNglTextureAtlas *self)
{
if (self->unused_pixels > 0)
return (double)(self->unused_pixels) / (double)(self->width * self->height);
return 0.0;
}
static inline gboolean
gsk_ngl_texture_library_can_cache (GskNglTextureLibrary *self,
int width,
int height)
{
g_assert (self->max_entry_size > 0);
return width <= self->max_entry_size && height <= self->max_entry_size;
}
G_END_DECLS
#endif /* __GSK_NGL_TEXTURE_LIBRARY_PRIVATE_H__ */
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