mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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612102fdbc
volatile is not sufficient to provide atomic guarantees and real atomics should be used instead. GCC 11 has started warning about using volatile with atomic operations. https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719 Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/911>
239 lines
6.6 KiB
C++
239 lines
6.6 KiB
C++
/*
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* GStreamer
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* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <vector>
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#include <stdio.h>
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#include <gst/video/video.h>
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#include <gst/gl/gl.h>
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#include <gst/gl/gstglfuncs.h>
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#include "gstqsgtexture.h"
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#define GST_CAT_DEFAULT gst_qsg_texture_debug
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GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
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GstQSGTexture::GstQSGTexture ()
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{
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static gsize _debug;
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initializeOpenGLFunctions();
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if (g_once_init_enter (&_debug)) {
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GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "qtqsgtexture", 0,
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"Qt Scenegraph Texture");
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g_once_init_leave (&_debug, 1);
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}
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gst_video_info_init (&this->v_info);
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this->buffer_ = NULL;
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this->buffer_was_bound = FALSE;
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this->qt_context_ = NULL;
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this->sync_buffer_ = gst_buffer_new ();
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this->dummy_tex_id_ = 0;
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}
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GstQSGTexture::~GstQSGTexture ()
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{
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gst_buffer_replace (&this->buffer_, NULL);
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gst_buffer_replace (&this->sync_buffer_, NULL);
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this->buffer_was_bound = FALSE;
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if (this->dummy_tex_id_ && QOpenGLContext::currentContext ()) {
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QOpenGLContext::currentContext ()->functions ()->glDeleteTextures (1,
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&this->dummy_tex_id_);
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}
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}
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/* only called from the streaming thread with scene graph thread blocked */
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void
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GstQSGTexture::setCaps (GstCaps * caps)
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{
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GST_LOG ("%p setCaps %" GST_PTR_FORMAT, this, caps);
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gst_video_info_from_caps (&this->v_info, caps);
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}
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/* only called from the streaming thread with scene graph thread blocked */
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gboolean
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GstQSGTexture::setBuffer (GstBuffer * buffer)
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{
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GST_LOG ("%p setBuffer %" GST_PTR_FORMAT, this, buffer);
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/* FIXME: update more state here */
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if (!gst_buffer_replace (&this->buffer_, buffer))
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return FALSE;
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this->buffer_was_bound = FALSE;
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this->qt_context_ = gst_gl_context_get_current ();
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return TRUE;
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}
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/* only called from the streaming thread with scene graph thread blocked */
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GstBuffer *
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GstQSGTexture::getBuffer (gboolean * was_bound)
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{
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GstBuffer *buffer = NULL;
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if (this->buffer_)
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buffer = gst_buffer_ref (this->buffer_);
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if (was_bound)
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*was_bound = this->buffer_was_bound;
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return buffer;
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}
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/* only called from qt's scene graph render thread */
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void
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GstQSGTexture::bind ()
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{
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const GstGLFuncs *gl;
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GstGLContext *context;
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GstGLSyncMeta *sync_meta;
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GstMemory *mem;
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guint tex_id;
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gboolean use_dummy_tex = TRUE;
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if (!this->qt_context_)
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return;
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if (!this->buffer_)
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goto out;
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if (GST_VIDEO_INFO_FORMAT (&this->v_info) == GST_VIDEO_FORMAT_UNKNOWN)
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goto out;
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this->mem_ = gst_buffer_peek_memory (this->buffer_, 0);
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if (!this->mem_)
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goto out;
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g_assert (this->qt_context_);
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gl = this->qt_context_->gl_vtable;
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/* FIXME: should really lock the memory to prevent write access */
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if (!gst_video_frame_map (&this->v_frame, &this->v_info, this->buffer_,
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(GstMapFlags) (GST_MAP_READ | GST_MAP_GL))) {
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g_assert_not_reached ();
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goto out;
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}
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mem = gst_buffer_peek_memory (this->buffer_, 0);
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g_assert (gst_is_gl_memory (mem));
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context = ((GstGLBaseMemory *)mem)->context;
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sync_meta = gst_buffer_get_gl_sync_meta (this->sync_buffer_);
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if (!sync_meta)
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sync_meta = gst_buffer_add_gl_sync_meta (context, this->sync_buffer_);
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gst_gl_sync_meta_set_sync_point (sync_meta, context);
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gst_gl_sync_meta_wait (sync_meta, this->qt_context_);
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tex_id = *(guint *) this->v_frame.data[0];
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GST_LOG ("%p binding Qt texture %u", this, tex_id);
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gl->BindTexture (GL_TEXTURE_2D, tex_id);
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gst_video_frame_unmap (&this->v_frame);
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/* Texture was successfully bound, so we do not need
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* to use the dummy texture */
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use_dummy_tex = FALSE;
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this->buffer_was_bound = TRUE;
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out:
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if (G_UNLIKELY (use_dummy_tex)) {
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QOpenGLContext *qglcontext = QOpenGLContext::currentContext ();
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QOpenGLFunctions *funcs = qglcontext->functions ();
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/* Create dummy texture if not already present.
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* Use the Qt OpenGL functions instead of the GstGL ones,
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* since we are using the Qt OpenGL context here, and we must
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* be able to delete the texture in the destructor. */
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if (this->dummy_tex_id_ == 0) {
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/* Make this a black 64x64 pixel RGBA texture.
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* This size and format is supported pretty much everywhere, so these
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* are a safe pick. (64 pixel sidelength must be supported according
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* to the GLES2 spec, table 6.18.)
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* Set min/mag filters to GL_LINEAR to make sure no mipmapping is used. */
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const int tex_sidelength = 64;
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std::vector < guint8 > dummy_data (tex_sidelength * tex_sidelength * 4, 0);
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funcs->glGenTextures (1, &this->dummy_tex_id_);
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funcs->glBindTexture (GL_TEXTURE_2D, this->dummy_tex_id_);
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funcs->glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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funcs->glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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funcs->glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, tex_sidelength,
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tex_sidelength, 0, GL_RGBA, GL_UNSIGNED_BYTE, &dummy_data[0]);
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}
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g_assert (this->dummy_tex_id_ != 0);
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funcs->glBindTexture (GL_TEXTURE_2D, this->dummy_tex_id_);
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}
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}
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/* can be called from any thread */
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int
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GstQSGTexture::textureId () const
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{
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int tex_id = 0;
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if (this->buffer_) {
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GstMemory *mem = gst_buffer_peek_memory (this->buffer_, 0);
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tex_id = ((GstGLMemory *) mem)->tex_id;
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}
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GST_LOG ("%p get texture id %u", this, tex_id);
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return tex_id;
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}
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/* can be called from any thread */
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QSize
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GstQSGTexture::textureSize () const
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{
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if (GST_VIDEO_INFO_FORMAT (&this->v_info) == GST_VIDEO_FORMAT_UNKNOWN)
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return QSize (0, 0);
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GST_TRACE ("%p get texture size %ux%u", this, this->v_info.width,
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this->v_info.height);
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return QSize (this->v_info.width, this->v_info.height);
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}
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/* can be called from any thread */
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bool
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GstQSGTexture::hasAlphaChannel () const
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{
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/* FIXME: support RGB textures */
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return true;
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}
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/* can be called from any thread */
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bool
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GstQSGTexture::hasMipmaps () const
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{
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return false;
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}
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