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 <gst/video/video.h>
30 #if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
32 #include <gst/gl/x11/gstgldisplay_x11.h>
33 #include <gst/gl/x11/gstglcontext_glx.h>
36 #if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
37 #include <gdk/gdkwayland.h>
38 #include <gst/gl/wayland/gstgldisplay_wayland.h>
42 * SECTION:gtkgstglwidget
43 * @short_description: a #GtkGLArea that renders GStreamer video #GstBuffers
44 * @see_also: #GtkGLArea, #GstBuffer
46 * #GtkGstGLWidget is an #GtkWidget that renders GStreamer video buffers.
49 #define GST_CAT_DEFAULT gtk_gst_gl_widget_debug
50 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
52 G_DEFINE_TYPE_WITH_CODE (GtkGstGLWidget, gtk_gst_gl_widget, GTK_TYPE_GL_AREA,
53 GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gtkgstglwidget", 0,
57 #define GTK_GST_GL_WIDGET_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
58 GTK_TYPE_GST_GL_WIDGET, GtkGstGLWidgetPrivate))
60 struct _GtkGstGLWidgetPrivate
63 GstGLDisplay *display;
64 GdkGLContext *gdk_context;
65 GstGLContext *other_context;
66 GstGLContext *context;
76 static const GLfloat vertices[] = {
77 1.0f, 1.0f, 0.0f, 1.0f, 0.0f,
78 -1.0f, 1.0f, 0.0f, 0.0f, 0.0f,
79 -1.0f, -1.0f, 0.0f, 0.0f, 1.0f,
80 1.0f, -1.0f, 0.0f, 1.0f, 1.0f
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;
121 priv->shader = gst_gl_shader_new (priv->context);
123 gst_gl_shader_compile_with_default_vf_and_check (priv->shader,
124 &priv->attr_position, &priv->attr_texture);
126 if (gl->GenVertexArrays) {
127 gl->GenVertexArrays (1, &priv->vao);
128 gl->BindVertexArray (priv->vao);
131 gl->GenBuffers (1, &priv->vertex_buffer);
132 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
133 gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices,
136 if (gl->GenVertexArrays) {
137 gtk_gst_gl_widget_bind_buffer (gst_widget);
138 gl->BindVertexArray (0);
141 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
143 priv->initted = TRUE;
147 _redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
149 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
150 const GstGLFuncs *gl = priv->context->gl_vtable;
151 const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
153 if (gst_widget->base.force_aspect_ratio) {
154 GstVideoRectangle src, dst, result;
155 gint widget_width, widget_height, widget_scale;
157 gl->ClearColor (0.0, 0.0, 0.0, 0.0);
158 gl->Clear (GL_COLOR_BUFFER_BIT);
160 widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget);
161 widget_width = gtk_widget_get_allocated_width ((GtkWidget *) gst_widget);
162 widget_height = gtk_widget_get_allocated_height ((GtkWidget *) gst_widget);
166 src.w = gst_widget->base.display_width;
167 src.h = gst_widget->base.display_height;
171 dst.w = widget_width * widget_scale;
172 dst.h = widget_height * widget_scale;
174 gst_video_sink_center_rect (src, dst, &result, TRUE);
176 gl->Viewport (result.x, result.y, result.w, result.h);
179 gst_gl_shader_use (priv->shader);
181 if (gl->BindVertexArray)
182 gl->BindVertexArray (priv->vao);
184 gtk_gst_gl_widget_bind_buffer (gst_widget);
186 gl->ActiveTexture (GL_TEXTURE0);
187 gl->BindTexture (GL_TEXTURE_2D, tex);
188 gst_gl_shader_set_uniform_1i (priv->shader, "tex", 0);
190 gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
192 if (gl->BindVertexArray)
193 gl->BindVertexArray (0);
195 gtk_gst_gl_widget_unbind_buffer (gst_widget);
197 gl->BindTexture (GL_TEXTURE_2D, 0);
203 glClearColor (0.0, 0.0, 0.0, 0.0);
204 glClear (GL_COLOR_BUFFER_BIT);
208 gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
210 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (widget)->priv;
211 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (widget);
213 GTK_GST_BASE_WIDGET_LOCK (widget);
215 if (!priv->context || !priv->other_context)
218 gst_gl_context_activate (priv->other_context, TRUE);
221 gtk_gst_gl_widget_init_redisplay (GTK_GST_GL_WIDGET (widget));
223 if (!priv->initted || !base_widget->negotiated) {
228 /* Upload latest buffer */
229 if (base_widget->pending_buffer) {
230 GstBuffer *buffer = base_widget->pending_buffer;
231 GstVideoFrame gl_frame;
232 GstGLSyncMeta *sync_meta;
234 if (!gst_video_frame_map (&gl_frame, &base_widget->v_info, buffer,
235 GST_MAP_READ | GST_MAP_GL)) {
241 sync_meta = gst_buffer_get_gl_sync_meta (buffer);
243 gst_gl_sync_meta_set_sync_point (sync_meta, priv->context);
244 gst_gl_sync_meta_wait (sync_meta, priv->other_context);
247 priv->current_tex = *(guint *) gl_frame.data[0];
249 gst_video_frame_unmap (&gl_frame);
251 if (base_widget->buffer)
252 gst_buffer_unref (base_widget->buffer);
254 /* Keep the buffer to ensure current_tex stay valid */
255 base_widget->buffer = buffer;
256 base_widget->pending_buffer = NULL;
259 GST_DEBUG ("rendering buffer %p with gdk context %p",
260 base_widget->buffer, context);
262 _redraw_texture (GTK_GST_GL_WIDGET (widget), priv->current_tex);
265 if (priv->other_context)
266 gst_gl_context_activate (priv->other_context, FALSE);
268 GTK_GST_BASE_WIDGET_UNLOCK (widget);
272 typedef void (*ThreadFunc) (gpointer data);
274 struct invoke_context
284 _invoke_func (struct invoke_context *info)
286 g_mutex_lock (&info->lock);
287 info->func (info->data);
289 g_cond_signal (&info->cond);
290 g_mutex_unlock (&info->lock);
292 return G_SOURCE_REMOVE;
296 _invoke_on_main (ThreadFunc func, gpointer data)
298 GMainContext *main_context = g_main_context_default ();
299 struct invoke_context info;
301 g_mutex_init (&info.lock);
302 g_cond_init (&info.cond);
307 g_main_context_invoke (main_context, (GSourceFunc) _invoke_func, &info);
309 g_mutex_lock (&info.lock);
311 g_cond_wait (&info.cond, &info.lock);
312 g_mutex_unlock (&info.lock);
314 g_mutex_clear (&info.lock);
315 g_cond_clear (&info.cond);
319 _reset_gl (GtkGstGLWidget * gst_widget)
321 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
322 const GstGLFuncs *gl = priv->other_context->gl_vtable;
324 if (!priv->gdk_context)
325 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
327 if (priv->gdk_context == NULL)
330 gdk_gl_context_make_current (priv->gdk_context);
331 gst_gl_context_activate (priv->other_context, TRUE);
334 gl->DeleteVertexArrays (1, &priv->vao);
338 if (priv->vertex_buffer) {
339 gl->DeleteBuffers (1, &priv->vertex_buffer);
340 priv->vertex_buffer = 0;
344 gst_object_unref (priv->upload);
349 gst_object_unref (priv->shader);
353 gst_gl_context_activate (priv->other_context, FALSE);
355 gst_object_unref (priv->other_context);
356 priv->other_context = NULL;
358 gdk_gl_context_clear_current ();
360 g_object_unref (priv->gdk_context);
361 priv->gdk_context = NULL;
365 gtk_gst_gl_widget_finalize (GObject * object)
367 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (object)->priv;
368 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (object);
370 if (priv->other_context)
371 _invoke_on_main ((ThreadFunc) _reset_gl, base_widget);
374 gst_object_unref (priv->context);
377 gst_object_unref (priv->display);
379 gtk_gst_base_widget_finalize (object);
380 G_OBJECT_CLASS (gtk_gst_gl_widget_parent_class)->finalize (object);
384 gtk_gst_gl_widget_class_init (GtkGstGLWidgetClass * klass)
386 GObjectClass *gobject_klass = (GObjectClass *) klass;
387 GtkGLAreaClass *gl_widget_klass = (GtkGLAreaClass *) klass;
389 g_type_class_add_private (klass, sizeof (GtkGstGLWidgetPrivate));
390 gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass));
392 gobject_klass->finalize = gtk_gst_gl_widget_finalize;
393 gl_widget_klass->render = gtk_gst_gl_widget_render;
397 gtk_gst_gl_widget_init (GtkGstGLWidget * gst_widget)
399 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (gst_widget);
401 GtkGstGLWidgetPrivate *priv;
403 gtk_gst_base_widget_init (base_widget);
405 gst_widget->priv = priv = GTK_GST_GL_WIDGET_GET_PRIVATE (gst_widget);
407 display = gdk_display_get_default ();
409 #if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
410 if (GDK_IS_X11_DISPLAY (display))
411 priv->display = (GstGLDisplay *)
412 gst_gl_display_x11_new_with_display (gdk_x11_display_get_xdisplay
415 #if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
416 if (GDK_IS_WAYLAND_DISPLAY (display)) {
417 struct wl_display *wayland_display =
418 gdk_wayland_display_get_wl_display (display);
419 priv->display = (GstGLDisplay *)
420 gst_gl_display_wayland_new_with_display (wayland_display);
427 priv->display = gst_gl_display_new ();
429 gtk_gl_area_set_has_alpha (GTK_GL_AREA (gst_widget),
430 !base_widget->ignore_alpha);
434 _get_gl_context (GtkGstGLWidget * gst_widget)
436 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
437 GstGLPlatform platform;
441 gtk_widget_realize (GTK_WIDGET (gst_widget));
443 if (priv->gdk_context)
444 g_object_unref (priv->gdk_context);
445 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
446 if (priv->gdk_context == NULL) {
447 GError *error = gtk_gl_area_get_error (GTK_GL_AREA (gst_widget));
449 GST_ERROR_OBJECT (gst_widget, "Error creating GdkGLContext : %s",
450 error ? error->message : "No error set by Gdk");
451 g_assert_not_reached ();
455 g_object_ref (priv->gdk_context);
457 gdk_gl_context_make_current (priv->gdk_context);
459 #if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
460 if (GST_IS_GL_DISPLAY_X11 (priv->display)) {
461 platform = GST_GL_PLATFORM_GLX;
462 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
463 gl_handle = gst_gl_context_get_current_gl_context (platform);
465 priv->other_context =
466 gst_gl_context_new_wrapped (priv->display, gl_handle,
470 #if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
471 if (GST_IS_GL_DISPLAY_WAYLAND (priv->display)) {
472 platform = GST_GL_PLATFORM_EGL;
473 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
474 gl_handle = gst_gl_context_get_current_gl_context (platform);
476 priv->other_context =
477 gst_gl_context_new_wrapped (priv->display, gl_handle,
486 if (priv->other_context) {
487 GError *error = NULL;
489 gst_gl_context_activate (priv->other_context, TRUE);
490 if (!gst_gl_context_fill_info (priv->other_context, &error)) {
491 GST_ERROR ("failed to retreive gdk context info: %s", error->message);
492 g_object_unref (priv->other_context);
493 priv->other_context = NULL;
495 gst_gl_context_activate (priv->other_context, FALSE);
501 gtk_gst_gl_widget_new (void)
503 return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL);
507 gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget)
509 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
510 GError *error = NULL;
512 g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), FALSE);
514 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
516 if (priv->display && priv->gdk_context && priv->other_context) {
517 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
521 if (!priv->other_context) {
522 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
523 _invoke_on_main ((ThreadFunc) _get_gl_context, gst_widget);
524 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
527 if (!GST_GL_IS_CONTEXT (priv->other_context)) {
528 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
532 if (!gst_gl_display_create_context (priv->display, priv->other_context,
533 &priv->context, &error)) {
534 g_clear_error (&error);
535 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
539 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
544 gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget)
546 if (!gst_widget->priv->other_context)
549 return gst_object_ref (gst_widget->priv->other_context);
553 gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget)
555 if (!gst_widget->priv->context)
558 return gst_object_ref (gst_widget->priv->context);
562 gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget)
564 if (!gst_widget->priv->display)
567 return gst_object_ref (gst_widget->priv->display);