233 lines
8.4 KiB
C
233 lines
8.4 KiB
C
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/* gskgltexturelibraryprivate.h
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*
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* Copyright 2020 Christian Hergert <chergert@redhat.com>
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*
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* This file is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 2.1 of the License, or (at your option)
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* any later version.
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*
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* This file is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#pragma once
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#include "gskgltypesprivate.h"
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#include "gskgltextureprivate.h"
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#include "stb_rect_pack.h"
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G_BEGIN_DECLS
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#define GSK_TYPE_GL_TEXTURE_LIBRARY (gsk_gl_texture_library_get_type ())
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#define GSK_GL_TEXTURE_LIBRARY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GSK_TYPE_GL_TEXTURE_LIBRARY, GskGLTextureLibrary))
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#define GSK_IS_GL_TEXTURE_LIBRARY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GSK_TYPE_GL_TEXTURE_LIBRARY))
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#define GSK_GL_TEXTURE_LIBRARY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GSK_TYPE_GL_TEXTURE_LIBRARY, GskGLTextureLibraryClass))
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#define GSK_IS_GL_TEXTURE_LIBRARY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GSK_TYPE_GL_TEXTURE_LIBRARY))
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#define GSK_GL_TEXTURE_LIBRARY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GSK_TYPE_GL_TEXTURE_LIBRARY, GskGLTextureLibraryClass))
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typedef struct _GskGLTextureAtlas
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{
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struct stbrp_context context;
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struct stbrp_node *nodes;
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int width;
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int height;
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guint texture_id;
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/* Pixels of rects that have been used at some point,
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* But are now unused.
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*/
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int unused_pixels;
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} GskGLTextureAtlas;
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typedef struct _GskGLTextureAtlasEntry
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{
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/* A backreference to either the atlas or texture containing
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* the contents of the atlas entry. For larger items, no atlas
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* is used and instead a direct texture.
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*/
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union {
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GskGLTextureAtlas *atlas;
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GskGLTexture *texture;
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};
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/* The area within the atlas translated to 0..1 bounds */
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struct {
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float x;
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float y;
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float x2;
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float y2;
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} area;
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/* Number of pixels in the entry, used to calculate usage
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* of an atlas while processing.
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*/
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guint n_pixels : 29;
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/* If entry has marked pixels as used in the atlas this frame */
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guint used : 1;
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/* If entry was accessed this frame */
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guint accessed : 1;
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/* When true, backref is an atlas, otherwise texture */
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guint is_atlased : 1;
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} GskGLTextureAtlasEntry;
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typedef struct _GskGLTextureLibrary
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{
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GObject parent_instance;
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GskGLDriver *driver;
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GPtrArray *atlases;
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GHashTable *hash_table;
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guint max_entry_size;
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guint max_frame_age;
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guint atlas_width;
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guint atlas_height;
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} GskGLTextureLibrary;
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typedef struct _GskGLTextureLibraryClass
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{
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GObjectClass parent_class;
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void (*begin_frame) (GskGLTextureLibrary *library,
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gint64 frame_id);
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gboolean (*compact) (GskGLTextureLibrary *library,
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gint64 frame_id);
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void (*clear_cache) (GskGLTextureLibrary *library);
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void (*init_atlas) (GskGLTextureLibrary *library,
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GskGLTextureAtlas *atlas);
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gboolean (*allocate) (GskGLTextureLibrary *library,
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GskGLTextureAtlas *atlas,
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int width,
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int height,
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int *out_x,
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int *out_y);
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} GskGLTextureLibraryClass;
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (GskGLTextureLibrary, g_object_unref)
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GType gsk_gl_texture_library_get_type (void) G_GNUC_CONST;
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gboolean gsk_gl_texture_library_compact (GskGLTextureLibrary *self,
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gint64 frame_id);
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void gsk_gl_texture_library_clear_cache (GskGLTextureLibrary *self);
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void gsk_gl_texture_library_reset (GskGLTextureLibrary *self);
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void gsk_gl_texture_library_set_atlas_size (GskGLTextureLibrary *self,
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int width,
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int height);
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GskGLTextureAtlas *gsk_gl_texture_library_acquire_atlas (GskGLTextureLibrary *self);
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void gsk_gl_texture_library_set_funcs (GskGLTextureLibrary *self,
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GHashFunc hash_func,
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GEqualFunc equal_func,
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GDestroyNotify key_destroy,
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GDestroyNotify value_destroy);
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void gsk_gl_texture_library_begin_frame (GskGLTextureLibrary *self,
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gint64 frame_id);
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gboolean gsk_gl_texture_library_allocate (GskGLTextureLibrary *self,
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GskGLTextureAtlas *atlas,
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int width,
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int height,
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int *out_x,
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int *out_y);
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gpointer gsk_gl_texture_library_pack (GskGLTextureLibrary *self,
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gpointer key,
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gsize valuelen,
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guint width,
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guint height,
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int padding,
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guint *out_packed_x,
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guint *out_packed_y);
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static inline void
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gsk_gl_texture_atlas_mark_unused (GskGLTextureAtlas *self,
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int n_pixels)
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{
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g_assert (n_pixels >= 0);
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self->unused_pixels += n_pixels;
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}
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static inline void
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gsk_gl_texture_atlas_entry_mark_used (GskGLTextureAtlasEntry *entry)
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{
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if (entry->used == TRUE || entry->is_atlased == FALSE)
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return;
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entry->atlas->unused_pixels -= entry->n_pixels;
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entry->used = TRUE;
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}
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static inline void
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gsk_gl_texture_atlas_entry_mark_unused (GskGLTextureAtlasEntry *entry)
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{
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if (entry->used == FALSE || entry->is_atlased == FALSE)
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return;
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entry->atlas->unused_pixels += entry->n_pixels;
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entry->used = FALSE;
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}
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static inline gboolean
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gsk_gl_texture_library_lookup (GskGLTextureLibrary *self,
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gconstpointer key,
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GskGLTextureAtlasEntry **out_entry)
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{
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GskGLTextureAtlasEntry *entry = g_hash_table_lookup (self->hash_table, key);
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if G_LIKELY (entry != NULL && entry->accessed && entry->used)
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{
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*out_entry = entry;
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return TRUE;
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}
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if (entry != NULL)
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{
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gsk_gl_texture_atlas_entry_mark_used (entry);
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entry->accessed = TRUE;
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*out_entry = entry;
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return TRUE;
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}
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return FALSE;
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}
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static inline guint
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GSK_GL_TEXTURE_ATLAS_ENTRY_TEXTURE (gconstpointer d)
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{
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const GskGLTextureAtlasEntry *e = d;
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return e->is_atlased ? e->atlas->texture_id
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: e->texture ? e->texture->texture_id : 0;
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}
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static inline double
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gsk_gl_texture_atlas_get_unused_ratio (const GskGLTextureAtlas *self)
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{
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if (self->unused_pixels > 0)
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return (double)(self->unused_pixels) / (double)(self->width * self->height);
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return 0.0;
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}
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static inline gboolean
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gsk_gl_texture_library_can_cache (GskGLTextureLibrary *self,
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int width,
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int height)
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{
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g_assert (self->max_entry_size > 0);
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return width <= self->max_entry_size && height <= self->max_entry_size;
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}
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G_END_DECLS
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