/* * GStreamer * Copyright (C) 2015 Matthew Waters * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gtkgstglwidget.h" #include "gstgtkutils.h" #include #include #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11) #include #include #endif #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND) #include #include #endif /** * SECTION:gtkgstglwidget * @title: GtkGstGlWidget * @short_description: a #GtkGLArea that renders GStreamer video #GstBuffers * @see_also: #GtkGLArea, #GstBuffer * * #GtkGstGLWidget is an #GtkWidget that renders GStreamer video buffers. */ #define GST_CAT_DEFAULT gtk_gst_gl_widget_debug GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); struct _GtkGstGLWidgetPrivate { gboolean initted; GstGLDisplay *display; GdkGLContext *gdk_context; GstGLContext *other_context; GstGLContext *context; GstGLUpload *upload; GstGLShader *shader; GLuint vao; GLuint vertex_buffer; GLint attr_position; GLint attr_texture; GLuint current_tex; GstGLOverlayCompositor *overlay_compositor; }; static const GLfloat vertices[] = { 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 1.0f }; G_DEFINE_TYPE_WITH_CODE (GtkGstGLWidget, gtk_gst_gl_widget, GTK_TYPE_GL_AREA, G_ADD_PRIVATE (GtkGstGLWidget) GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gtkgstglwidget", 0, "Gtk Gst GL Widget");); static void gtk_gst_gl_widget_bind_buffer (GtkGstGLWidget * gst_widget) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; const GstGLFuncs *gl = priv->context->gl_vtable; gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer); /* Load the vertex position */ gl->VertexAttribPointer (priv->attr_position, 3, GL_FLOAT, GL_FALSE, 5 * sizeof (GLfloat), (void *) 0); /* Load the texture coordinate */ gl->VertexAttribPointer (priv->attr_texture, 2, GL_FLOAT, GL_FALSE, 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat))); gl->EnableVertexAttribArray (priv->attr_position); gl->EnableVertexAttribArray (priv->attr_texture); } static void gtk_gst_gl_widget_unbind_buffer (GtkGstGLWidget * gst_widget) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; const GstGLFuncs *gl = priv->context->gl_vtable; gl->BindBuffer (GL_ARRAY_BUFFER, 0); gl->DisableVertexAttribArray (priv->attr_position); gl->DisableVertexAttribArray (priv->attr_texture); } static void gtk_gst_gl_widget_init_redisplay (GtkGstGLWidget * gst_widget) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; const GstGLFuncs *gl = priv->context->gl_vtable; GError *error = NULL; gst_gl_insert_debug_marker (priv->other_context, "initializing redisplay"); if (!(priv->shader = gst_gl_shader_new_default (priv->context, &error))) { GST_ERROR ("Failed to initialize shader: %s", error->message); return; } priv->attr_position = gst_gl_shader_get_attribute_location (priv->shader, "a_position"); priv->attr_texture = gst_gl_shader_get_attribute_location (priv->shader, "a_texcoord"); if (gl->GenVertexArrays) { gl->GenVertexArrays (1, &priv->vao); gl->BindVertexArray (priv->vao); } gl->GenBuffers (1, &priv->vertex_buffer); gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer); gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices, GL_STATIC_DRAW); if (gl->GenVertexArrays) { gtk_gst_gl_widget_bind_buffer (gst_widget); gl->BindVertexArray (0); } gl->BindBuffer (GL_ARRAY_BUFFER, 0); priv->overlay_compositor = gst_gl_overlay_compositor_new (priv->other_context); priv->initted = TRUE; } static void _redraw_texture (GtkGstGLWidget * gst_widget, guint tex) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; const GstGLFuncs *gl = priv->context->gl_vtable; const GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; if (gst_widget->base.force_aspect_ratio) { GstVideoRectangle src, dst, result; gint widget_width, widget_height, widget_scale; gl->ClearColor (0.0, 0.0, 0.0, 0.0); gl->Clear (GL_COLOR_BUFFER_BIT); widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget); widget_width = gtk_widget_get_allocated_width ((GtkWidget *) gst_widget); widget_height = gtk_widget_get_allocated_height ((GtkWidget *) gst_widget); src.x = 0; src.y = 0; src.w = gst_widget->base.display_width; src.h = gst_widget->base.display_height; dst.x = 0; dst.y = 0; dst.w = widget_width * widget_scale; dst.h = widget_height * widget_scale; gst_video_sink_center_rect (src, dst, &result, TRUE); gl->Viewport (result.x, result.y, result.w, result.h); } gst_gl_shader_use (priv->shader); if (gl->BindVertexArray) gl->BindVertexArray (priv->vao); gtk_gst_gl_widget_bind_buffer (gst_widget); gl->ActiveTexture (GL_TEXTURE0); gl->BindTexture (GL_TEXTURE_2D, tex); gst_gl_shader_set_uniform_1i (priv->shader, "tex", 0); gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices); if (gl->BindVertexArray) gl->BindVertexArray (0); gtk_gst_gl_widget_unbind_buffer (gst_widget); gl->BindTexture (GL_TEXTURE_2D, 0); } static inline void _draw_black (GstGLContext * context) { const GstGLFuncs *gl = context->gl_vtable; gst_gl_insert_debug_marker (context, "no buffer. rendering black"); gl->ClearColor (0.0, 0.0, 0.0, 0.0); gl->Clear (GL_COLOR_BUFFER_BIT); } static gboolean gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context) { GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (widget)->priv; GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (widget); GTK_GST_BASE_WIDGET_LOCK (widget); if (!priv->context || !priv->other_context) goto done; gst_gl_context_activate (priv->other_context, TRUE); if (!priv->initted) gtk_gst_gl_widget_init_redisplay (GTK_GST_GL_WIDGET (widget)); if (!priv->initted || !base_widget->negotiated) { _draw_black (priv->other_context); goto done; } /* Upload latest buffer */ if (base_widget->pending_buffer) { GstBuffer *buffer = base_widget->pending_buffer; GstVideoFrame gl_frame; GstGLSyncMeta *sync_meta; if (!gst_video_frame_map (&gl_frame, &base_widget->v_info, buffer, GST_MAP_READ | GST_MAP_GL)) { _draw_black (priv->other_context); goto done; } priv->current_tex = *(guint *) gl_frame.data[0]; gst_gl_insert_debug_marker (priv->other_context, "redrawing texture %u", priv->current_tex); gst_gl_overlay_compositor_upload_overlays (priv->overlay_compositor, buffer); sync_meta = gst_buffer_get_gl_sync_meta (buffer); if (sync_meta) { /* XXX: the set_sync() seems to be needed for resizing */ gst_gl_sync_meta_set_sync_point (sync_meta, priv->context); gst_gl_sync_meta_wait (sync_meta, priv->other_context); } gst_video_frame_unmap (&gl_frame); if (base_widget->buffer) gst_buffer_unref (base_widget->buffer); /* Keep the buffer to ensure current_tex stay valid */ base_widget->buffer = buffer; base_widget->pending_buffer = NULL; } GST_DEBUG ("rendering buffer %p with gdk context %p", base_widget->buffer, context); _redraw_texture (GTK_GST_GL_WIDGET (widget), priv->current_tex); gst_gl_overlay_compositor_draw_overlays (priv->overlay_compositor); gst_gl_insert_debug_marker (priv->other_context, "texture %u redrawn", priv->current_tex); done: if (priv->other_context) gst_gl_context_activate (priv->other_context, FALSE); GTK_GST_BASE_WIDGET_UNLOCK (widget); return FALSE; } static void _reset_gl (GtkGstGLWidget * gst_widget) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; const GstGLFuncs *gl = priv->other_context->gl_vtable; if (!priv->gdk_context) priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget)); if (priv->gdk_context == NULL) return; gdk_gl_context_make_current (priv->gdk_context); gst_gl_context_activate (priv->other_context, TRUE); if (priv->vao) { gl->DeleteVertexArrays (1, &priv->vao); priv->vao = 0; } if (priv->vertex_buffer) { gl->DeleteBuffers (1, &priv->vertex_buffer); priv->vertex_buffer = 0; } if (priv->upload) { gst_object_unref (priv->upload); priv->upload = NULL; } if (priv->shader) { gst_object_unref (priv->shader); priv->shader = NULL; } if (priv->overlay_compositor) gst_object_unref (priv->overlay_compositor); gst_gl_context_activate (priv->other_context, FALSE); gst_object_unref (priv->other_context); priv->other_context = NULL; gdk_gl_context_clear_current (); g_object_unref (priv->gdk_context); priv->gdk_context = NULL; } static void gtk_gst_gl_widget_finalize (GObject * object) { GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (object)->priv; GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (object); if (priv->other_context) gst_gtk_invoke_on_main ((GThreadFunc) _reset_gl, base_widget); if (priv->context) gst_object_unref (priv->context); if (priv->display) gst_object_unref (priv->display); gtk_gst_base_widget_finalize (object); G_OBJECT_CLASS (gtk_gst_gl_widget_parent_class)->finalize (object); } static void gtk_gst_gl_widget_class_init (GtkGstGLWidgetClass * klass) { GObjectClass *gobject_klass = (GObjectClass *) klass; GtkGLAreaClass *gl_widget_klass = (GtkGLAreaClass *) klass; gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass)); gobject_klass->finalize = gtk_gst_gl_widget_finalize; gl_widget_klass->render = gtk_gst_gl_widget_render; } static void gtk_gst_gl_widget_init (GtkGstGLWidget * gst_widget) { GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (gst_widget); GdkDisplay *display; GtkGstGLWidgetPrivate *priv; gtk_gst_base_widget_init (base_widget); gst_widget->priv = priv = gtk_gst_gl_widget_get_instance_private (gst_widget); display = gdk_display_get_default (); #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11) if (GDK_IS_X11_DISPLAY (display)) priv->display = (GstGLDisplay *) gst_gl_display_x11_new_with_display (gdk_x11_display_get_xdisplay (display)); #endif #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND) if (GDK_IS_WAYLAND_DISPLAY (display)) { struct wl_display *wayland_display = gdk_wayland_display_get_wl_display (display); priv->display = (GstGLDisplay *) gst_gl_display_wayland_new_with_display (wayland_display); } #endif (void) display; if (!priv->display) priv->display = gst_gl_display_new (); gtk_gl_area_set_has_alpha (GTK_GL_AREA (gst_widget), !base_widget->ignore_alpha); } static void _get_gl_context (GtkGstGLWidget * gst_widget) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; GstGLPlatform platform; GstGLAPI gl_api; guintptr gl_handle; gtk_widget_realize (GTK_WIDGET (gst_widget)); if (priv->other_context) gst_object_unref (priv->other_context); priv->other_context = NULL; if (priv->gdk_context) g_object_unref (priv->gdk_context); priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget)); if (priv->gdk_context == NULL) { GError *error = gtk_gl_area_get_error (GTK_GL_AREA (gst_widget)); GST_ERROR_OBJECT (gst_widget, "Error creating GdkGLContext : %s", error ? error->message : "No error set by Gdk"); g_clear_error (&error); return; } g_object_ref (priv->gdk_context); gdk_gl_context_make_current (priv->gdk_context); #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11) if (GST_IS_GL_DISPLAY_X11 (priv->display)) { platform = GST_GL_PLATFORM_GLX; gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL); gl_handle = gst_gl_context_get_current_gl_context (platform); if (gl_handle) priv->other_context = gst_gl_context_new_wrapped (priv->display, gl_handle, platform, gl_api); } #endif #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND) if (GST_IS_GL_DISPLAY_WAYLAND (priv->display)) { platform = GST_GL_PLATFORM_EGL; gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL); gl_handle = gst_gl_context_get_current_gl_context (platform); if (gl_handle) priv->other_context = gst_gl_context_new_wrapped (priv->display, gl_handle, platform, gl_api); } #endif (void) platform; (void) gl_api; (void) gl_handle; if (priv->other_context) { GError *error = NULL; gst_gl_context_activate (priv->other_context, TRUE); if (!gst_gl_context_fill_info (priv->other_context, &error)) { GST_ERROR ("failed to retrieve gdk context info: %s", error->message); g_clear_error (&error); g_object_unref (priv->other_context); priv->other_context = NULL; } else { gst_gl_context_activate (priv->other_context, FALSE); } } } GtkWidget * gtk_gst_gl_widget_new (void) { return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL); } gboolean gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget) { GtkGstGLWidgetPrivate *priv = gst_widget->priv; GError *error = NULL; g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), FALSE); g_return_val_if_fail (priv->display != NULL, FALSE); GTK_GST_BASE_WIDGET_LOCK (gst_widget); if (priv->display && priv->gdk_context && priv->other_context) { GTK_GST_BASE_WIDGET_UNLOCK (gst_widget); return TRUE; } if (!priv->other_context) { GTK_GST_BASE_WIDGET_UNLOCK (gst_widget); gst_gtk_invoke_on_main ((GThreadFunc) _get_gl_context, gst_widget); GTK_GST_BASE_WIDGET_LOCK (gst_widget); } if (!GST_IS_GL_CONTEXT (priv->other_context)) { GTK_GST_BASE_WIDGET_UNLOCK (gst_widget); return FALSE; } GST_OBJECT_LOCK (priv->display); if (!gst_gl_display_create_context (priv->display, priv->other_context, &priv->context, &error)) { g_clear_error (&error); GST_OBJECT_UNLOCK (priv->display); GTK_GST_BASE_WIDGET_UNLOCK (gst_widget); return FALSE; } gst_gl_display_add_context (priv->display, priv->context); GST_OBJECT_UNLOCK (priv->display); GTK_GST_BASE_WIDGET_UNLOCK (gst_widget); return TRUE; } GstGLContext * gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget) { if (!gst_widget->priv->other_context) return NULL; return gst_object_ref (gst_widget->priv->other_context); } GstGLContext * gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget) { if (!gst_widget->priv->context) return NULL; return gst_object_ref (gst_widget->priv->context); } GstGLDisplay * gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget) { if (!gst_widget->priv->display) return NULL; return gst_object_ref (gst_widget->priv->display); }