libmks/lib/mks-dmabuf-paintable.c

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/* mks-dmabuf-paintable.c
*
* Copyright 2023 Christian Hergert <chergert@redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 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: GPL-3.0-or-later
*/
#define G_LOG_DOMAIN "mks-dmabuf-paintable"
#include "config.h"
#include <gtk/gtk.h>
#include "mks-dmabuf-paintable-private.h"
#include "mks-gl-context-private.h"
/*
* MksDmabufPaintable is a GdkPaintable for a single dmabuf_fd which is then
* imported into OpenGL. This has an advantage over just using a single
* GdkGLTexture for such a situation in that we can take advantage of how
* GskGLRenderer and GdkTexture work.
*
* First, by swapping between 2 GdkGLTextures, gsk_render_node_diff()
* will see a pointer difference and ensure the tile region is damaged.
* Since it is a dmabuf, we can already assume the contents are available
* to the GPU by layers beneath us.
*/
#define TILE_WIDTH 128
#define TILE_HEIGHT 128
struct _MksDmabufPaintable
{
GObject parent_instance;
GdkTexture *textures[2];
GArray *tiles;
guint width;
guint height;
};
typedef struct _MksDmabufTextureData
{
GdkGLContext *gl_context;
GLuint texture_id;
} MksDmabufTextureData;
typedef struct _MksDmabufTile
{
graphene_rect_t area;
guint16 texture : 1;
} MksDmabufTile;
static int
mks_dmabuf_paintable_get_intrinsic_width (GdkPaintable *paintable)
{
return MKS_DMABUF_PAINTABLE (paintable)->width;
}
static int
mks_dmabuf_paintable_get_intrinsic_height (GdkPaintable *paintable)
{
return MKS_DMABUF_PAINTABLE (paintable)->height;
}
static double
mks_dmabuf_paintable_get_intrinsic_aspect_ratio (GdkPaintable *paintable)
{
MksDmabufPaintable *self = MKS_DMABUF_PAINTABLE (paintable);
return (double)self->width / (double)self->height;
}
static void
mks_dmabuf_paintable_snapshot (GdkPaintable *paintable,
GdkSnapshot *snapshot,
double width,
double height)
{
MksDmabufPaintable *self = (MksDmabufPaintable *)paintable;
graphene_rect_t area;
g_assert (MKS_IS_DMABUF_PAINTABLE (self));
g_assert (GDK_IS_SNAPSHOT (snapshot));
gtk_snapshot_save (snapshot);
gtk_snapshot_scale (snapshot,
width / (double)self->width,
height / (double)self->height);
area = GRAPHENE_RECT_INIT (0, 0, self->width, self->height);
for (guint i = 0; i < self->tiles->len; i++)
{
MksDmabufTile *tile = &g_array_index (self->tiles, MksDmabufTile, i);
GdkTexture *texture = self->textures[tile->texture];
gtk_snapshot_push_clip (snapshot, &tile->area);
gtk_snapshot_append_texture (snapshot, texture, &area);
gtk_snapshot_pop (snapshot);
}
gtk_snapshot_restore (snapshot);
}
static void
paintable_iface_init (GdkPaintableInterface *iface)
{
iface->get_intrinsic_width = mks_dmabuf_paintable_get_intrinsic_width;
iface->get_intrinsic_height = mks_dmabuf_paintable_get_intrinsic_height;
iface->get_intrinsic_aspect_ratio = mks_dmabuf_paintable_get_intrinsic_aspect_ratio;
iface->snapshot = mks_dmabuf_paintable_snapshot;
}
G_DEFINE_FINAL_TYPE_WITH_CODE (MksDmabufPaintable, mks_dmabuf_paintable, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE, paintable_iface_init))
static MksDmabufTextureData *
mks_dmabuf_texture_data_new (GdkGLContext *gl_context,
GLuint texture_id)
{
MksDmabufTextureData *texture_data;
g_assert (GDK_IS_GL_CONTEXT (gl_context));
g_assert (texture_id > 0);
texture_data = g_atomic_rc_box_new0 (MksDmabufTextureData);
texture_data->gl_context = g_object_ref (gl_context);
texture_data->texture_id = texture_id;
return texture_data;
}
static MksDmabufTextureData *
mks_dmabuf_texture_data_ref (MksDmabufTextureData *texture_data)
{
return g_atomic_rc_box_acquire (texture_data);
}
static void
mks_dmabuf_texture_data_finalize (gpointer data)
{
MksDmabufTextureData *texture_data = data;
gdk_gl_context_make_current (texture_data->gl_context);
glDeleteTextures (1, &texture_data->texture_id);
texture_data->texture_id = 0;
g_clear_object (&texture_data->gl_context);
}
static void
mks_dmabuf_texture_data_unref (MksDmabufTextureData *texture_data)
{
g_atomic_rc_box_release_full (texture_data, mks_dmabuf_texture_data_finalize);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC (MksDmabufTextureData, mks_dmabuf_texture_data_unref)
static void
mks_dmabuf_paintable_dispose (GObject *object)
{
MksDmabufPaintable *self = (MksDmabufPaintable *)object;
g_clear_pointer (&self->tiles, g_array_unref);
g_clear_object (&self->textures[0]);
g_clear_object (&self->textures[1]);
G_OBJECT_CLASS (mks_dmabuf_paintable_parent_class)->dispose (object);
}
static void
mks_dmabuf_paintable_class_init (MksDmabufPaintableClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = mks_dmabuf_paintable_dispose;
}
static void
mks_dmabuf_paintable_init (MksDmabufPaintable *self)
{
self->tiles = g_array_new (FALSE, FALSE, sizeof (MksDmabufTile));
}
MksDmabufPaintable *
mks_dmabuf_paintable_new (GdkGLContext *gl_context,
int dmabuf_fd,
guint width,
guint height,
guint stride,
guint fourcc,
guint64 modifier,
gboolean y0_top,
GError **error)
{
g_autoptr(MksDmabufTextureData) texture_data = NULL;
g_autoptr(MksDmabufPaintable) self = NULL;
GLuint texture_id;
guint zero = 0;
if (dmabuf_fd < 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"invalid dmabuf_fd (%d)",
dmabuf_fd);
return NULL;
}
if (width == 0 || height == 0 || stride == 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"invalid width/height/stride (%u/%u/%u)",
width, height, stride);
return NULL;
}
self = g_object_new (MKS_TYPE_DMABUF_PAINTABLE, NULL);
self->width = width;
self->height = height;
if (!(texture_id = mks_gl_context_import_dmabuf (gl_context,
fourcc, width, height,
1, &dmabuf_fd, &stride, &zero, &modifier)))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Failed to import dmabuf into GL texture");
return NULL;
}
texture_data = mks_dmabuf_texture_data_new (gl_context, texture_id);
self->textures[0] = gdk_gl_texture_new (gl_context, texture_id, width, height,
(GDestroyNotify) mks_dmabuf_texture_data_unref,
mks_dmabuf_texture_data_ref (texture_data));
self->textures[1] = gdk_gl_texture_new (gl_context, texture_id, width, height,
(GDestroyNotify) mks_dmabuf_texture_data_unref,
mks_dmabuf_texture_data_ref (texture_data));
for (guint y = 0; y < height; y += TILE_HEIGHT)
{
guint tile_height = MIN (TILE_HEIGHT, height - y);
for (guint x = 0; x < width; x += TILE_WIDTH)
{
MksDmabufTile tile;
guint tile_width = MIN (TILE_WIDTH, width - x);
tile.area = GRAPHENE_RECT_INIT (x, y, tile_width, tile_height);
tile.texture = 0;
g_array_append_val (self->tiles, tile);
}
}
return g_steal_pointer (&self);
}
void
mks_dmabuf_paintable_invalidate (MksDmabufPaintable *self,
guint x,
guint y,
guint width,
guint height)
{
graphene_rect_t area;
g_return_if_fail (MKS_IS_DMABUF_PAINTABLE (self));
if (width == 0 || height == 0)
return;
area = GRAPHENE_RECT_INIT (x, y, width, height);
for (guint i = 0; i < self->tiles->len; i++)
{
MksDmabufTile *tile = &g_array_index (self->tiles, MksDmabufTile, i);
G_GNUC_UNUSED graphene_rect_t res;
if (graphene_rect_intersection (&area, &tile->area, &res))
tile->texture = !tile->texture;
}
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
}