gtk/gdk/gdkdmabufegl.c
Benjamin Otte f0eceb4aa3 dmabuf: Remove out argument
The format is the same everywhere, so instead of letting every
implementation do the same thing, do it in a central place instead.
2023-12-16 09:20:36 +01:00

336 lines
11 KiB
C

/* gdkdmabufegl.c
*
* Copyright 2023 Red Hat, Inc.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#if defined(HAVE_DMABUF) && defined (HAVE_EGL)
#include "gdkdmabufprivate.h"
#include "gdkdmabufformatsbuilderprivate.h"
#include "gdkdebugprivate.h"
#include "gdkdmabuffourccprivate.h"
#include "gdkdmabuftextureprivate.h"
#include "gdkmemoryformatprivate.h"
#include "gdkdisplayprivate.h"
#include "gdkglcontextprivate.h"
#include "gdktexturedownloader.h"
#include <graphene.h>
#include <epoxy/egl.h>
/* A dmabuf downloader implementation that downloads buffers via
* gsk_renderer_render_texture + GL texture download.
*/
static gboolean
gdk_dmabuf_egl_downloader_collect_formats (const GdkDmabufDownloader *downloader,
GdkDisplay *display,
GdkDmabufFormatsBuilder *formats,
GdkDmabufFormatsBuilder *external)
{
GdkGLContext *context = gdk_display_get_gl_context (display);
EGLDisplay egl_display = gdk_display_get_egl_display (display);
int num_fourccs;
int *fourccs;
guint64 *modifiers;
unsigned int *external_only;
int n_mods;
if (egl_display == EGL_NO_DISPLAY ||
!display->have_egl_dma_buf_import)
return FALSE;
gdk_gl_context_make_current (context);
eglQueryDmaBufFormatsEXT (egl_display, 0, NULL, &num_fourccs);
fourccs = g_new (int, num_fourccs);
eglQueryDmaBufFormatsEXT (egl_display, num_fourccs, fourccs, &num_fourccs);
n_mods = 80;
modifiers = g_new (guint64, n_mods);
external_only = g_new (unsigned int, n_mods);
for (int i = 0; i < num_fourccs; i++)
{
int num_modifiers;
gboolean all_external;
eglQueryDmaBufModifiersEXT (egl_display,
fourccs[i],
0,
NULL,
NULL,
&num_modifiers);
if (num_modifiers > n_mods)
{
n_mods = num_modifiers;
modifiers = g_renew (guint64, modifiers, n_mods);
external_only = g_renew (unsigned int, external_only, n_mods);
}
eglQueryDmaBufModifiersEXT (egl_display,
fourccs[i],
num_modifiers,
modifiers,
external_only,
&num_modifiers);
all_external = TRUE;
for (int j = 0; j < num_modifiers; j++)
{
/* All linear formats we support are already added my the mmap downloader.
* We don't add external formats, unless we can use them (via GLES)
*/
if (modifiers[j] != DRM_FORMAT_MOD_LINEAR &&
(!external_only[j] || gdk_gl_context_get_use_es (context)))
{
GDK_DISPLAY_DEBUG (display, DMABUF,
"%s%s dmabuf format %.4s:%#" G_GINT64_MODIFIER "x",
external_only[j] ? "external " : "",
downloader->name,
(char *) &fourccs[i],
modifiers[j]);
gdk_dmabuf_formats_builder_add_format (formats, fourccs[i], modifiers[j]);
}
if (external_only[j])
gdk_dmabuf_formats_builder_add_format (external, fourccs[i], modifiers[j]);
else
all_external = FALSE;
}
/* Accept implicit modifiers as long as we accept the format at all.
* This is a bit of a crapshot, but unfortunately needed for a bunch
* of drivers.
*
* As an extra wrinkle, treat the implicit modifier as 'external only'
* if all formats with the same fourcc are 'external only'.
*/
if (!all_external || gdk_gl_context_get_use_es (context))
gdk_dmabuf_formats_builder_add_format (formats, fourccs[i], DRM_FORMAT_MOD_INVALID);
if (all_external)
gdk_dmabuf_formats_builder_add_format (external, fourccs[i], DRM_FORMAT_MOD_INVALID);
}
g_free (modifiers);
g_free (external_only);
g_free (fourccs);
return TRUE;
}
static gboolean
gdk_dmabuf_egl_downloader_add_formats (const GdkDmabufDownloader *downloader,
GdkDisplay *display,
GdkDmabufFormatsBuilder *builder)
{
GdkDmabufFormatsBuilder *formats;
GdkDmabufFormatsBuilder *external;
gboolean retval = FALSE;
g_assert (display->egl_dmabuf_formats == NULL);
g_assert (display->egl_external_formats == NULL);
formats = gdk_dmabuf_formats_builder_new ();
external = gdk_dmabuf_formats_builder_new ();
retval = gdk_dmabuf_egl_downloader_collect_formats (downloader, display, formats, external);
display->egl_dmabuf_formats = gdk_dmabuf_formats_builder_free_to_formats (formats);
display->egl_external_formats = gdk_dmabuf_formats_builder_free_to_formats (external);
gdk_dmabuf_formats_builder_add_formats (builder, display->egl_dmabuf_formats);
return retval;
}
static gboolean
gdk_dmabuf_egl_downloader_supports (const GdkDmabufDownloader *downloader,
GdkDisplay *display,
const GdkDmabuf *dmabuf,
gboolean premultiplied,
GError **error)
{
if (gdk_dmabuf_formats_contains (display->egl_dmabuf_formats, dmabuf->fourcc, dmabuf->modifier))
return TRUE;
g_set_error (error,
GDK_DMABUF_ERROR, GDK_DMABUF_ERROR_UNSUPPORTED_FORMAT,
"Unsupported dmabuf format: %.4s:%#" G_GINT64_MODIFIER "x",
(char *) &dmabuf->fourcc, dmabuf->modifier);
return FALSE;
}
/* Hack. We don't include gsk/gsk.h here to avoid a build order problem
* with the generated header gskenumtypes.h, so we need to hack around
* a bit to access the gsk api we need.
*/
typedef gpointer GskRenderer;
extern GskRenderer * gsk_gl_renderer_new (void);
extern gboolean gsk_renderer_realize (GskRenderer *renderer,
GdkSurface *surface,
GError **error);
extern GdkTexture * gsk_renderer_convert_texture (GskRenderer *renderer,
GdkTexture *texture);
typedef void (* InvokeFunc) (gpointer data);
typedef struct _InvokeData
{
volatile int spinlock;
InvokeFunc func;
gpointer data;
} InvokeData;
static gboolean
gdk_dmabuf_egl_downloader_invoke_callback (gpointer data)
{
InvokeData *invoke = data;
GdkGLContext *previous;
previous = gdk_gl_context_get_current ();
invoke->func (invoke->data);
if (previous)
gdk_gl_context_make_current (previous);
else
gdk_gl_context_clear_current ();
g_atomic_int_set (&invoke->spinlock, 1);
return FALSE;
}
/* Run func in the main thread, taking care not to disturb
* the current GL context of the caller.
*/
static void
gdk_dmabuf_egl_downloader_run (InvokeFunc func,
gpointer data)
{
InvokeData invoke = { 0, func, data };
g_main_context_invoke (NULL, gdk_dmabuf_egl_downloader_invoke_callback, &invoke);
while (g_atomic_int_get (&invoke.spinlock) == 0) ;
}
typedef struct _Download Download;
struct _Download
{
GdkDmabufTexture *texture;
GdkMemoryFormat format;
guchar *data;
gsize stride;
};
static GskRenderer *
get_gsk_renderer (GdkDisplay *display)
{
if (!display->egl_gsk_renderer)
{
GskRenderer *renderer;
GError *error = NULL;
renderer = gsk_gl_renderer_new ();
if (!gsk_renderer_realize (renderer, NULL, &error))
{
g_warning ("Failed to realize GL renderer: %s", error->message);
g_error_free (error);
g_object_unref (renderer);
return NULL;
}
display->egl_gsk_renderer = renderer;
}
return display->egl_gsk_renderer;
}
static void
gdk_dmabuf_egl_downloader_do_download (gpointer data)
{
Download *download = data;
GdkDisplay *display;
GskRenderer *renderer;
GdkTexture *native;
GdkTextureDownloader *downloader;
display = gdk_dmabuf_texture_get_display (download->texture);
renderer = get_gsk_renderer (display);
native = gsk_renderer_convert_texture (renderer, GDK_TEXTURE (download->texture));
downloader = gdk_texture_downloader_new (native);
gdk_texture_downloader_set_format (downloader, download->format);
gdk_texture_downloader_download_into (downloader, download->data, download->stride);
gdk_texture_downloader_free (downloader);
g_object_unref (native);
}
static void
gdk_dmabuf_egl_downloader_download (const GdkDmabufDownloader *downloader,
GdkTexture *texture,
GdkMemoryFormat format,
guchar *data,
gsize stride)
{
Download download;
const GdkDmabuf *dmabuf;
download.texture = GDK_DMABUF_TEXTURE (texture);
download.format = format;
download.data = data;
download.stride = stride;
dmabuf = gdk_dmabuf_texture_get_dmabuf (GDK_DMABUF_TEXTURE (texture));
GDK_DISPLAY_DEBUG (gdk_dmabuf_texture_get_display (download.texture), DMABUF,
"Using %s for downloading a dmabuf (format %.4s:%#" G_GINT64_MODIFIER "x)",
downloader->name, (char *)&dmabuf->fourcc, dmabuf->modifier);
gdk_dmabuf_egl_downloader_run (gdk_dmabuf_egl_downloader_do_download, &download);
}
const GdkDmabufDownloader *
gdk_dmabuf_get_egl_downloader (void)
{
static const GdkDmabufDownloader downloader = {
"egl",
gdk_dmabuf_egl_downloader_add_formats,
gdk_dmabuf_egl_downloader_supports,
gdk_dmabuf_egl_downloader_download,
};
return &downloader;
}
#endif /* HAVE_DMABUF && HAVE_EGL */