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bc17dfa83d
In case the context's only reference was held by being the current context, setting the new context would free it. Resetting it later would then be a use-after-free. Fixes #6694
293 lines
9.7 KiB
C
293 lines
9.7 KiB
C
/* gdkdmabufegl.c
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*
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* Copyright 2023 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#if defined(HAVE_DMABUF) && defined (HAVE_EGL)
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#include "gdkdmabufeglprivate.h"
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#include "gdkdmabufformatsbuilderprivate.h"
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#include "gdkdebugprivate.h"
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#include "gdkdmabuffourccprivate.h"
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#include "gdkdmabuftextureprivate.h"
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#include "gdkmemoryformatprivate.h"
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#include "gdkdisplayprivate.h"
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#include "gdkglcontextprivate.h"
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#include "gdktexturedownloader.h"
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#include <graphene.h>
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/* A dmabuf downloader implementation that downloads buffers via
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* gsk_renderer_render_texture + GL texture download.
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*/
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static gboolean
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gdk_dmabuf_egl_downloader_collect_formats (GdkDisplay *display,
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GdkDmabufFormatsBuilder *formats,
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GdkDmabufFormatsBuilder *external)
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{
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GdkGLContext *context = gdk_display_get_gl_context (display);
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EGLDisplay egl_display = gdk_display_get_egl_display (display);
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int num_fourccs;
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int *fourccs;
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guint64 *modifiers;
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unsigned int *external_only;
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int n_mods;
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if (egl_display == EGL_NO_DISPLAY ||
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!display->have_egl_dma_buf_import)
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return FALSE;
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gdk_gl_context_make_current (context);
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eglQueryDmaBufFormatsEXT (egl_display, 0, NULL, &num_fourccs);
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fourccs = g_new (int, num_fourccs);
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eglQueryDmaBufFormatsEXT (egl_display, num_fourccs, fourccs, &num_fourccs);
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n_mods = 80;
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modifiers = g_new (guint64, n_mods);
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external_only = g_new (unsigned int, n_mods);
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for (int i = 0; i < num_fourccs; i++)
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{
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int num_modifiers;
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gboolean all_external;
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eglQueryDmaBufModifiersEXT (egl_display,
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fourccs[i],
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0,
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NULL,
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NULL,
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&num_modifiers);
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if (num_modifiers > n_mods)
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{
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n_mods = num_modifiers;
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modifiers = g_renew (guint64, modifiers, n_mods);
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external_only = g_renew (unsigned int, external_only, n_mods);
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}
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eglQueryDmaBufModifiersEXT (egl_display,
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fourccs[i],
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num_modifiers,
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modifiers,
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external_only,
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&num_modifiers);
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all_external = TRUE;
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for (int j = 0; j < num_modifiers; j++)
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{
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/* All linear formats we support are already added my the mmap downloader.
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* We don't add external formats, unless we can use them (via GLES)
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*/
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if (modifiers[j] != DRM_FORMAT_MOD_LINEAR &&
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(!external_only[j] || gdk_gl_context_get_use_es (context)))
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{
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GDK_DISPLAY_DEBUG (display, DMABUF,
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"%s EGL dmabuf format %.4s:%#" G_GINT64_MODIFIER "x",
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external_only[j] ? "external " : "",
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(char *) &fourccs[i],
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modifiers[j]);
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gdk_dmabuf_formats_builder_add_format (formats, fourccs[i], modifiers[j]);
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}
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if (external_only[j])
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gdk_dmabuf_formats_builder_add_format (external, fourccs[i], modifiers[j]);
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else
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all_external = FALSE;
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}
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/* Accept implicit modifiers as long as we accept the format at all.
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* This is a bit of a crapshot, but unfortunately needed for a bunch
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* of drivers.
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*
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* As an extra wrinkle, treat the implicit modifier as 'external only'
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* if all formats with the same fourcc are 'external only'.
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*/
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if (!all_external || gdk_gl_context_get_use_es (context))
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gdk_dmabuf_formats_builder_add_format (formats, fourccs[i], DRM_FORMAT_MOD_INVALID);
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if (all_external)
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gdk_dmabuf_formats_builder_add_format (external, fourccs[i], DRM_FORMAT_MOD_INVALID);
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}
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g_free (modifiers);
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g_free (external_only);
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g_free (fourccs);
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return TRUE;
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}
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/* Hack. We don't include gsk/gsk.h here to avoid a build order problem
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* with the generated header gskenumtypes.h, so we need to hack around
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* a bit to access the gsk api we need.
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*/
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typedef struct _GskRenderer GskRenderer;
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extern GskRenderer * gsk_gl_renderer_new (void);
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extern gboolean gsk_renderer_realize_for_display (GskRenderer *renderer,
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GdkDisplay *display,
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GError **error);
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GdkDmabufDownloader *
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gdk_dmabuf_get_egl_downloader (GdkDisplay *display,
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GdkDmabufFormatsBuilder *builder)
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{
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GdkDmabufFormatsBuilder *formats;
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GdkDmabufFormatsBuilder *external;
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gboolean retval = FALSE;
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GError *error = NULL;
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GskRenderer *renderer;
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GdkGLContext *previous;
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g_assert (display->egl_dmabuf_formats == NULL);
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g_assert (display->egl_external_formats == NULL);
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if (!gdk_display_prepare_gl (display, NULL))
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return NULL;
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previous = gdk_gl_context_get_current ();
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if (previous)
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g_object_ref (previous);
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formats = gdk_dmabuf_formats_builder_new ();
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external = gdk_dmabuf_formats_builder_new ();
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retval = gdk_dmabuf_egl_downloader_collect_formats (display, formats, external);
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display->egl_dmabuf_formats = gdk_dmabuf_formats_builder_free_to_formats (formats);
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display->egl_external_formats = gdk_dmabuf_formats_builder_free_to_formats (external);
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gdk_dmabuf_formats_builder_add_formats (builder, display->egl_dmabuf_formats);
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if (!retval)
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{
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if (previous)
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gdk_gl_context_make_current (previous);
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return NULL;
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}
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renderer = gsk_gl_renderer_new ();
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if (!gsk_renderer_realize_for_display (renderer, display, &error))
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{
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g_warning ("Failed to realize GL renderer: %s", error->message);
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g_error_free (error);
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g_object_unref (renderer);
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if (previous)
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gdk_gl_context_make_current (previous);
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return NULL;
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}
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if (previous)
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{
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gdk_gl_context_make_current (previous);
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g_object_unref (previous);
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}
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return GDK_DMABUF_DOWNLOADER (renderer);
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}
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EGLImage
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gdk_dmabuf_egl_create_image (GdkDisplay *display,
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int width,
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int height,
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const GdkDmabuf *dmabuf,
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int target)
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{
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EGLDisplay egl_display = gdk_display_get_egl_display (display);
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EGLint attribs[64];
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int i;
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EGLImage image;
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g_return_val_if_fail (width > 0, 0);
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g_return_val_if_fail (height > 0, 0);
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g_return_val_if_fail (1 <= dmabuf->n_planes && dmabuf->n_planes <= 4, 0);
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g_return_val_if_fail (target == GL_TEXTURE_2D || target == GL_TEXTURE_EXTERNAL_OES, 0);
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if (egl_display == EGL_NO_DISPLAY || !display->have_egl_dma_buf_import)
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{
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GDK_DISPLAY_DEBUG (display, DMABUF,
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"Can't import dmabufs into GL, missing EGL or EGL_EXT_image_dma_buf_import_modifiers");
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return EGL_NO_IMAGE;
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}
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GDK_DISPLAY_DEBUG (display, DMABUF,
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"Importing dmabuf (format: %.4s:%#" G_GINT64_MODIFIER "x, planes: %u) into GL",
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(char *) &dmabuf->fourcc, dmabuf->modifier, dmabuf->n_planes);
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i = 0;
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attribs[i++] = EGL_IMAGE_PRESERVED_KHR;
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attribs[i++] = EGL_TRUE;
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attribs[i++] = EGL_WIDTH;
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attribs[i++] = width;
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attribs[i++] = EGL_HEIGHT;
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attribs[i++] = height;
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attribs[i++] = EGL_LINUX_DRM_FOURCC_EXT;
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attribs[i++] = dmabuf->fourcc;
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attribs[i++] = EGL_YUV_COLOR_SPACE_HINT_EXT;
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attribs[i++] = EGL_ITU_REC601_EXT;
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attribs[i++] = EGL_SAMPLE_RANGE_HINT_EXT;
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attribs[i++] = EGL_YUV_NARROW_RANGE_EXT;
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#define ADD_PLANE(plane) \
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{ \
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if (dmabuf->modifier != DRM_FORMAT_MOD_INVALID) \
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{ \
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attribs[i++] = EGL_DMA_BUF_PLANE## plane ##_MODIFIER_LO_EXT; \
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attribs[i++] = dmabuf->modifier & 0xFFFFFFFF; \
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attribs[i++] = EGL_DMA_BUF_PLANE## plane ## _MODIFIER_HI_EXT; \
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attribs[i++] = dmabuf->modifier >> 32; \
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} \
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attribs[i++] = EGL_DMA_BUF_PLANE## plane ##_FD_EXT; \
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attribs[i++] = dmabuf->planes[plane].fd; \
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attribs[i++] = EGL_DMA_BUF_PLANE## plane ##_PITCH_EXT; \
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attribs[i++] = dmabuf->planes[plane].stride; \
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attribs[i++] = EGL_DMA_BUF_PLANE## plane ##_OFFSET_EXT; \
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attribs[i++] = dmabuf->planes[plane].offset; \
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}
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ADD_PLANE (0);
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if (dmabuf->n_planes > 1) ADD_PLANE (1);
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if (dmabuf->n_planes > 2) ADD_PLANE (2);
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if (dmabuf->n_planes > 3) ADD_PLANE (3);
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attribs[i++] = EGL_NONE;
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g_assert (i < G_N_ELEMENTS (attribs));
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image = eglCreateImageKHR (egl_display,
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EGL_NO_CONTEXT,
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EGL_LINUX_DMA_BUF_EXT,
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(EGLClientBuffer)NULL,
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attribs);
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if (image == EGL_NO_IMAGE)
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{
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GDK_DISPLAY_DEBUG (display, DMABUF,
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"Creating EGLImage for dmabuf failed: %#x",
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eglGetError ());
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return 0;
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}
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return image;
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}
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#endif /* HAVE_DMABUF && HAVE_EGL */
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