3 * Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
27 #include "gtkgstglwidget.h"
28 #include "gstgtkutils.h"
29 #include <gst/gl/gstglfuncs.h>
30 #include <gst/video/video.h>
32 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
34 #include <gst/gl/x11/gstgldisplay_x11.h>
37 #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
38 #include <gdk/gdkwayland.h>
39 #include <gst/gl/wayland/gstgldisplay_wayland.h>
43 * SECTION:gtkgstglwidget
44 * @title: GtkGstGlWidget
45 * @short_description: a #GtkGLArea that renders GStreamer video #GstBuffers
46 * @see_also: #GtkGLArea, #GstBuffer
48 * #GtkGstGLWidget is an #GtkWidget that renders GStreamer video buffers.
51 #define GST_CAT_DEFAULT gtk_gst_gl_widget_debug
52 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
54 struct _GtkGstGLWidgetPrivate
57 GstGLDisplay *display;
58 GdkGLContext *gdk_context;
59 GstGLContext *other_context;
60 GstGLContext *context;
68 GstGLOverlayCompositor *overlay_compositor;
71 static const GLfloat vertices[] = {
72 1.0f, 1.0f, 0.0f, 1.0f, 0.0f,
73 -1.0f, 1.0f, 0.0f, 0.0f, 0.0f,
74 -1.0f, -1.0f, 0.0f, 0.0f, 1.0f,
75 1.0f, -1.0f, 0.0f, 1.0f, 1.0f
78 G_DEFINE_TYPE_WITH_CODE (GtkGstGLWidget, gtk_gst_gl_widget, GTK_TYPE_GL_AREA,
79 G_ADD_PRIVATE (GtkGstGLWidget)
80 GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gtkgstglwidget", 0,
81 "Gtk Gst GL Widget"););
84 gtk_gst_gl_widget_bind_buffer (GtkGstGLWidget * gst_widget)
86 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
87 const GstGLFuncs *gl = priv->context->gl_vtable;
89 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
91 /* Load the vertex position */
92 gl->VertexAttribPointer (priv->attr_position, 3, GL_FLOAT, GL_FALSE,
93 5 * sizeof (GLfloat), (void *) 0);
95 /* Load the texture coordinate */
96 gl->VertexAttribPointer (priv->attr_texture, 2, GL_FLOAT, GL_FALSE,
97 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
99 gl->EnableVertexAttribArray (priv->attr_position);
100 gl->EnableVertexAttribArray (priv->attr_texture);
104 gtk_gst_gl_widget_unbind_buffer (GtkGstGLWidget * gst_widget)
106 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
107 const GstGLFuncs *gl = priv->context->gl_vtable;
109 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
111 gl->DisableVertexAttribArray (priv->attr_position);
112 gl->DisableVertexAttribArray (priv->attr_texture);
116 gtk_gst_gl_widget_init_redisplay (GtkGstGLWidget * gst_widget)
118 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
119 const GstGLFuncs *gl = priv->context->gl_vtable;
120 GError *error = NULL;
122 gst_gl_insert_debug_marker (priv->other_context, "initializing redisplay");
123 if (!(priv->shader = gst_gl_shader_new_default (priv->context, &error))) {
124 GST_ERROR ("Failed to initialize shader: %s", error->message);
128 priv->attr_position =
129 gst_gl_shader_get_attribute_location (priv->shader, "a_position");
131 gst_gl_shader_get_attribute_location (priv->shader, "a_texcoord");
133 if (gl->GenVertexArrays) {
134 gl->GenVertexArrays (1, &priv->vao);
135 gl->BindVertexArray (priv->vao);
138 gl->GenBuffers (1, &priv->vertex_buffer);
139 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
140 gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices,
143 if (gl->GenVertexArrays) {
144 gtk_gst_gl_widget_bind_buffer (gst_widget);
145 gl->BindVertexArray (0);
148 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
150 priv->overlay_compositor =
151 gst_gl_overlay_compositor_new (priv->other_context);
153 priv->initted = TRUE;
157 _redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
159 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
160 const GstGLFuncs *gl = priv->context->gl_vtable;
161 const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
163 if (gst_widget->base.force_aspect_ratio) {
164 GstVideoRectangle src, dst, result;
165 gint widget_width, widget_height, widget_scale;
167 gl->ClearColor (0.0, 0.0, 0.0, 0.0);
168 gl->Clear (GL_COLOR_BUFFER_BIT);
170 widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget);
171 widget_width = gtk_widget_get_allocated_width ((GtkWidget *) gst_widget);
172 widget_height = gtk_widget_get_allocated_height ((GtkWidget *) gst_widget);
176 src.w = gst_widget->base.display_width;
177 src.h = gst_widget->base.display_height;
181 dst.w = widget_width * widget_scale;
182 dst.h = widget_height * widget_scale;
184 gst_video_sink_center_rect (src, dst, &result, TRUE);
186 gl->Viewport (result.x, result.y, result.w, result.h);
189 gst_gl_shader_use (priv->shader);
191 if (gl->BindVertexArray)
192 gl->BindVertexArray (priv->vao);
193 gtk_gst_gl_widget_bind_buffer (gst_widget);
195 gl->ActiveTexture (GL_TEXTURE0);
196 gl->BindTexture (GL_TEXTURE_2D, tex);
197 gst_gl_shader_set_uniform_1i (priv->shader, "tex", 0);
199 gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
201 if (gl->BindVertexArray)
202 gl->BindVertexArray (0);
204 gtk_gst_gl_widget_unbind_buffer (gst_widget);
206 gl->BindTexture (GL_TEXTURE_2D, 0);
210 _draw_black (GstGLContext * context)
212 const GstGLFuncs *gl = context->gl_vtable;
214 gst_gl_insert_debug_marker (context, "no buffer. rendering black");
215 gl->ClearColor (0.0, 0.0, 0.0, 0.0);
216 gl->Clear (GL_COLOR_BUFFER_BIT);
220 gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
222 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (widget)->priv;
223 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (widget);
225 GTK_GST_BASE_WIDGET_LOCK (widget);
227 if (!priv->context || !priv->other_context)
230 gst_gl_context_activate (priv->other_context, TRUE);
233 gtk_gst_gl_widget_init_redisplay (GTK_GST_GL_WIDGET (widget));
235 if (!priv->initted || !base_widget->negotiated) {
236 _draw_black (priv->other_context);
240 /* Upload latest buffer */
241 if (base_widget->pending_buffer) {
242 GstBuffer *buffer = base_widget->pending_buffer;
243 GstVideoFrame gl_frame;
244 GstGLSyncMeta *sync_meta;
246 if (!gst_video_frame_map (&gl_frame, &base_widget->v_info, buffer,
247 GST_MAP_READ | GST_MAP_GL)) {
248 _draw_black (priv->other_context);
252 priv->current_tex = *(guint *) gl_frame.data[0];
253 gst_gl_insert_debug_marker (priv->other_context, "redrawing texture %u",
256 gst_gl_overlay_compositor_upload_overlays (priv->overlay_compositor,
259 sync_meta = gst_buffer_get_gl_sync_meta (buffer);
261 /* XXX: the set_sync() seems to be needed for resizing */
262 gst_gl_sync_meta_set_sync_point (sync_meta, priv->context);
263 gst_gl_sync_meta_wait (sync_meta, priv->other_context);
266 gst_video_frame_unmap (&gl_frame);
268 if (base_widget->buffer)
269 gst_buffer_unref (base_widget->buffer);
271 /* Keep the buffer to ensure current_tex stay valid */
272 base_widget->buffer = buffer;
273 base_widget->pending_buffer = NULL;
276 GST_DEBUG ("rendering buffer %p with gdk context %p",
277 base_widget->buffer, context);
279 _redraw_texture (GTK_GST_GL_WIDGET (widget), priv->current_tex);
280 gst_gl_overlay_compositor_draw_overlays (priv->overlay_compositor);
282 gst_gl_insert_debug_marker (priv->other_context, "texture %u redrawn",
286 if (priv->other_context)
287 gst_gl_context_activate (priv->other_context, FALSE);
289 GTK_GST_BASE_WIDGET_UNLOCK (widget);
294 _reset_gl (GtkGstGLWidget * gst_widget)
296 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
297 const GstGLFuncs *gl = priv->other_context->gl_vtable;
299 if (!priv->gdk_context)
300 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
302 if (priv->gdk_context == NULL)
305 gdk_gl_context_make_current (priv->gdk_context);
306 gst_gl_context_activate (priv->other_context, TRUE);
309 gl->DeleteVertexArrays (1, &priv->vao);
313 if (priv->vertex_buffer) {
314 gl->DeleteBuffers (1, &priv->vertex_buffer);
315 priv->vertex_buffer = 0;
319 gst_object_unref (priv->upload);
324 gst_object_unref (priv->shader);
328 if (priv->overlay_compositor)
329 gst_object_unref (priv->overlay_compositor);
331 gst_gl_context_activate (priv->other_context, FALSE);
333 gst_object_unref (priv->other_context);
334 priv->other_context = NULL;
336 gdk_gl_context_clear_current ();
338 g_object_unref (priv->gdk_context);
339 priv->gdk_context = NULL;
343 gtk_gst_gl_widget_finalize (GObject * object)
345 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (object)->priv;
346 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (object);
348 if (priv->other_context)
349 gst_gtk_invoke_on_main ((GThreadFunc) _reset_gl, base_widget);
352 gst_object_unref (priv->context);
355 gst_object_unref (priv->display);
357 gtk_gst_base_widget_finalize (object);
358 G_OBJECT_CLASS (gtk_gst_gl_widget_parent_class)->finalize (object);
362 gtk_gst_gl_widget_class_init (GtkGstGLWidgetClass * klass)
364 GObjectClass *gobject_klass = (GObjectClass *) klass;
365 GtkGLAreaClass *gl_widget_klass = (GtkGLAreaClass *) klass;
367 gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass));
369 gobject_klass->finalize = gtk_gst_gl_widget_finalize;
370 gl_widget_klass->render = gtk_gst_gl_widget_render;
374 gtk_gst_gl_widget_init (GtkGstGLWidget * gst_widget)
376 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (gst_widget);
378 GtkGstGLWidgetPrivate *priv;
380 gtk_gst_base_widget_init (base_widget);
382 gst_widget->priv = priv = gtk_gst_gl_widget_get_instance_private (gst_widget);
384 display = gdk_display_get_default ();
386 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
387 if (GDK_IS_X11_DISPLAY (display))
388 priv->display = (GstGLDisplay *)
389 gst_gl_display_x11_new_with_display (gdk_x11_display_get_xdisplay
392 #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
393 if (GDK_IS_WAYLAND_DISPLAY (display)) {
394 struct wl_display *wayland_display =
395 gdk_wayland_display_get_wl_display (display);
396 priv->display = (GstGLDisplay *)
397 gst_gl_display_wayland_new_with_display (wayland_display);
404 priv->display = gst_gl_display_new ();
406 gtk_gl_area_set_has_alpha (GTK_GL_AREA (gst_widget),
407 !base_widget->ignore_alpha);
411 _get_gl_context (GtkGstGLWidget * gst_widget)
413 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
414 GstGLPlatform platform;
418 gtk_widget_realize (GTK_WIDGET (gst_widget));
420 if (priv->other_context)
421 gst_object_unref (priv->other_context);
422 priv->other_context = NULL;
424 if (priv->gdk_context)
425 g_object_unref (priv->gdk_context);
427 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
428 if (priv->gdk_context == NULL) {
429 GError *error = gtk_gl_area_get_error (GTK_GL_AREA (gst_widget));
431 GST_ERROR_OBJECT (gst_widget, "Error creating GdkGLContext : %s",
432 error ? error->message : "No error set by Gdk");
433 g_clear_error (&error);
437 g_object_ref (priv->gdk_context);
439 gdk_gl_context_make_current (priv->gdk_context);
441 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
442 if (GST_IS_GL_DISPLAY_X11 (priv->display)) {
443 platform = GST_GL_PLATFORM_GLX;
444 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
445 gl_handle = gst_gl_context_get_current_gl_context (platform);
447 priv->other_context =
448 gst_gl_context_new_wrapped (priv->display, gl_handle,
452 #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
453 if (GST_IS_GL_DISPLAY_WAYLAND (priv->display)) {
454 platform = GST_GL_PLATFORM_EGL;
455 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
456 gl_handle = gst_gl_context_get_current_gl_context (platform);
458 priv->other_context =
459 gst_gl_context_new_wrapped (priv->display, gl_handle,
468 if (priv->other_context) {
469 GError *error = NULL;
471 gst_gl_context_activate (priv->other_context, TRUE);
472 if (!gst_gl_context_fill_info (priv->other_context, &error)) {
473 GST_ERROR ("failed to retrieve gdk context info: %s", error->message);
474 g_clear_error (&error);
475 g_object_unref (priv->other_context);
476 priv->other_context = NULL;
478 gst_gl_context_activate (priv->other_context, FALSE);
484 gtk_gst_gl_widget_new (void)
486 return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL);
490 gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget)
492 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
493 GError *error = NULL;
495 g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), FALSE);
496 g_return_val_if_fail (priv->display != NULL, FALSE);
498 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
500 if (priv->display && priv->gdk_context && priv->other_context) {
501 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
505 if (!priv->other_context) {
506 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
507 gst_gtk_invoke_on_main ((GThreadFunc) _get_gl_context, gst_widget);
508 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
511 if (!GST_IS_GL_CONTEXT (priv->other_context)) {
512 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
516 GST_OBJECT_LOCK (priv->display);
517 if (!gst_gl_display_create_context (priv->display, priv->other_context,
518 &priv->context, &error)) {
519 g_clear_error (&error);
520 GST_OBJECT_UNLOCK (priv->display);
521 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
524 gst_gl_display_add_context (priv->display, priv->context);
525 GST_OBJECT_UNLOCK (priv->display);
527 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
532 gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget)
534 if (!gst_widget->priv->other_context)
537 return gst_object_ref (gst_widget->priv->other_context);
541 gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget)
543 if (!gst_widget->priv->context)
546 return gst_object_ref (gst_widget->priv->context);
550 gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget)
552 if (!gst_widget->priv->display)
555 return gst_object_ref (gst_widget->priv->display);