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,
54 "Gtk Gst GL Widget"););
56 #define GTK_GST_GL_WIDGET_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
57 GTK_TYPE_GST_GL_WIDGET, GtkGstGLWidgetPrivate))
59 struct _GtkGstGLWidgetPrivate
62 GstGLDisplay *display;
63 GdkGLContext *gdk_context;
64 GstGLContext *other_context;
65 GstGLContext *context;
75 static const GLfloat vertices[] = {
76 1.0f, 1.0f, 0.0f, 1.0f, 0.0f,
77 -1.0f, 1.0f, 0.0f, 0.0f, 0.0f,
78 -1.0f, -1.0f, 0.0f, 0.0f, 1.0f,
79 1.0f, -1.0f, 0.0f, 1.0f, 1.0f
83 gtk_gst_gl_widget_bind_buffer (GtkGstGLWidget * gst_widget)
85 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
86 const GstGLFuncs *gl = priv->context->gl_vtable;
88 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
90 /* Load the vertex position */
91 gl->VertexAttribPointer (priv->attr_position, 3, GL_FLOAT, GL_FALSE,
92 5 * sizeof (GLfloat), (void *) 0);
94 /* Load the texture coordinate */
95 gl->VertexAttribPointer (priv->attr_texture, 2, GL_FLOAT, GL_FALSE,
96 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
98 gl->EnableVertexAttribArray (priv->attr_position);
99 gl->EnableVertexAttribArray (priv->attr_texture);
103 gtk_gst_gl_widget_unbind_buffer (GtkGstGLWidget * gst_widget)
105 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
106 const GstGLFuncs *gl = priv->context->gl_vtable;
108 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
110 gl->DisableVertexAttribArray (priv->attr_position);
111 gl->DisableVertexAttribArray (priv->attr_texture);
115 gtk_gst_gl_widget_init_redisplay (GtkGstGLWidget * gst_widget)
117 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
118 const GstGLFuncs *gl = priv->context->gl_vtable;
120 priv->shader = gst_gl_shader_new (priv->context);
122 gst_gl_shader_compile_with_default_vf_and_check (priv->shader,
123 &priv->attr_position, &priv->attr_texture);
125 if (gl->GenVertexArrays) {
126 gl->GenVertexArrays (1, &priv->vao);
127 gl->BindVertexArray (priv->vao);
130 gl->GenBuffers (1, &priv->vertex_buffer);
131 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
132 gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices,
135 if (gl->GenVertexArrays) {
136 gtk_gst_gl_widget_bind_buffer (gst_widget);
137 gl->BindVertexArray (0);
140 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
142 priv->initted = TRUE;
146 _redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
148 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
149 const GstGLFuncs *gl = priv->context->gl_vtable;
150 const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
152 if (gst_widget->base.force_aspect_ratio) {
153 GstVideoRectangle src, dst, result;
154 gint widget_width, widget_height, widget_scale;
156 gl->ClearColor (0.0, 0.0, 0.0, 0.0);
157 gl->Clear (GL_COLOR_BUFFER_BIT);
159 widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget);
160 widget_width = gtk_widget_get_allocated_width ((GtkWidget *) gst_widget);
161 widget_height = gtk_widget_get_allocated_height ((GtkWidget *) gst_widget);
165 src.w = gst_widget->base.display_width;
166 src.h = gst_widget->base.display_height;
170 dst.w = widget_width * widget_scale;
171 dst.h = widget_height * widget_scale;
173 gst_video_sink_center_rect (src, dst, &result, TRUE);
175 gl->Viewport (result.x, result.y, result.w, result.h);
178 gst_gl_shader_use (priv->shader);
180 if (gl->BindVertexArray)
181 gl->BindVertexArray (priv->vao);
183 gtk_gst_gl_widget_bind_buffer (gst_widget);
185 gl->ActiveTexture (GL_TEXTURE0);
186 gl->BindTexture (GL_TEXTURE_2D, tex);
187 gst_gl_shader_set_uniform_1i (priv->shader, "tex", 0);
189 gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
191 if (gl->BindVertexArray)
192 gl->BindVertexArray (0);
194 gtk_gst_gl_widget_unbind_buffer (gst_widget);
196 gl->BindTexture (GL_TEXTURE_2D, 0);
200 gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
202 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (widget)->priv;
203 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (widget);
205 GTK_GST_BASE_WIDGET_LOCK (widget);
207 if (!priv->initted && priv->context)
208 gtk_gst_gl_widget_init_redisplay (GTK_GST_GL_WIDGET (widget));
210 if (priv->initted && base_widget->negotiated && base_widget->buffer) {
211 GST_DEBUG ("rendering buffer %p with gdk context %p",
212 base_widget->buffer, context);
214 gst_gl_context_activate (priv->other_context, TRUE);
216 if (base_widget->new_buffer || priv->current_tex == 0) {
217 GstVideoFrame gl_frame;
218 GstGLSyncMeta *sync_meta;
220 if (!gst_video_frame_map (&gl_frame, &base_widget->v_info,
221 base_widget->buffer, GST_MAP_READ | GST_MAP_GL)) {
225 sync_meta = gst_buffer_get_gl_sync_meta (base_widget->buffer);
227 gst_gl_sync_meta_set_sync_point (sync_meta, priv->context);
228 gst_gl_sync_meta_wait (sync_meta, priv->other_context);
231 priv->current_tex = *(guint *) gl_frame.data[0];
233 gst_video_frame_unmap (&gl_frame);
236 _redraw_texture (GTK_GST_GL_WIDGET (widget), priv->current_tex);
237 base_widget->new_buffer = FALSE;
240 /* FIXME: nothing to display */
241 glClearColor (0.0, 0.0, 0.0, 0.0);
242 glClear (GL_COLOR_BUFFER_BIT);
245 if (priv->other_context)
246 gst_gl_context_activate (priv->other_context, FALSE);
248 GTK_GST_BASE_WIDGET_UNLOCK (widget);
252 typedef void (*ThreadFunc) (gpointer data);
254 struct invoke_context
264 _invoke_func (struct invoke_context *info)
266 g_mutex_lock (&info->lock);
267 info->func (info->data);
269 g_cond_signal (&info->cond);
270 g_mutex_unlock (&info->lock);
272 return G_SOURCE_REMOVE;
276 _invoke_on_main (ThreadFunc func, gpointer data)
278 GMainContext *main_context = g_main_context_default ();
279 struct invoke_context info;
281 g_mutex_init (&info.lock);
282 g_cond_init (&info.cond);
287 g_main_context_invoke (main_context, (GSourceFunc) _invoke_func, &info);
289 g_mutex_lock (&info.lock);
291 g_cond_wait (&info.cond, &info.lock);
292 g_mutex_unlock (&info.lock);
294 g_mutex_clear (&info.lock);
295 g_cond_clear (&info.cond);
299 _reset_gl (GtkGstGLWidget * gst_widget)
301 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
302 const GstGLFuncs *gl = priv->other_context->gl_vtable;
304 if (!priv->gdk_context)
305 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
307 if (priv->gdk_context == NULL)
310 gdk_gl_context_make_current (priv->gdk_context);
311 gst_gl_context_activate (priv->other_context, TRUE);
314 gl->DeleteVertexArrays (1, &priv->vao);
318 if (priv->vertex_buffer) {
319 gl->DeleteBuffers (1, &priv->vertex_buffer);
320 priv->vertex_buffer = 0;
324 gst_object_unref (priv->upload);
329 gst_object_unref (priv->shader);
333 gst_gl_context_activate (priv->other_context, FALSE);
335 gst_object_unref (priv->other_context);
336 priv->other_context = NULL;
338 gdk_gl_context_clear_current ();
340 g_object_unref (priv->gdk_context);
341 priv->gdk_context = NULL;
345 _reset (GtkGstBaseWidget * base_widget)
347 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (base_widget)->priv;
349 priv->initted = FALSE;
351 priv->vertex_buffer = 0;
352 priv->attr_position = 0;
353 priv->attr_texture = 0;
354 priv->current_tex = 0;
356 gtk_gl_area_set_has_alpha (GTK_GL_AREA (base_widget),
357 !base_widget->ignore_alpha);
360 /* called from main thread */
362 gtk_gst_gl_widget_reset (GtkGstBaseWidget * base_widget)
364 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (base_widget)->priv;
365 const GstGLFuncs *gl = priv->other_context->gl_vtable;
367 _reset (base_widget);
370 gl->DeleteVertexArrays (1, &priv->vao);
374 if (priv->vertex_buffer) {
375 gl->DeleteBuffers (1, &priv->vertex_buffer);
376 priv->vertex_buffer = 0;
381 gtk_gst_gl_widget_finalize (GObject * object)
383 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (object)->priv;
384 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (object);
386 _reset (base_widget);
388 if (priv->other_context)
389 _invoke_on_main ((ThreadFunc) _reset_gl, base_widget);
392 gst_object_unref (priv->context);
395 gst_object_unref (priv->display);
397 gtk_gst_base_widget_finalize (object);
398 G_OBJECT_CLASS (gtk_gst_gl_widget_parent_class)->finalize (object);
402 gtk_gst_gl_widget_class_init (GtkGstGLWidgetClass * klass)
404 GObjectClass *gobject_klass = (GObjectClass *) klass;
405 GtkGLAreaClass *gl_widget_klass = (GtkGLAreaClass *) klass;
406 GtkGstBaseWidget *base_widget_klass = (GtkGstBaseWidget *) klass;
408 g_type_class_add_private (klass, sizeof (GtkGstGLWidgetPrivate));
409 gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass));
411 gobject_klass->finalize = gtk_gst_gl_widget_finalize;
412 gl_widget_klass->render = gtk_gst_gl_widget_render;
413 base_widget_klass->reset = gtk_gst_gl_widget_reset;
417 gtk_gst_gl_widget_init (GtkGstGLWidget * gst_widget)
419 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (gst_widget);
421 GtkGstGLWidgetPrivate *priv;
423 gtk_gst_base_widget_init (base_widget);
425 gst_widget->priv = priv = GTK_GST_GL_WIDGET_GET_PRIVATE (gst_widget);
427 display = gdk_display_get_default ();
429 #if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
430 if (GDK_IS_X11_DISPLAY (display))
431 priv->display = (GstGLDisplay *)
432 gst_gl_display_x11_new_with_display (gdk_x11_display_get_xdisplay
435 #if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
436 if (GDK_IS_WAYLAND_DISPLAY (display)) {
437 struct wl_display *wayland_display =
438 gdk_wayland_display_get_wl_display (display);
439 priv->display = (GstGLDisplay *)
440 gst_gl_display_wayland_new_with_display (wayland_display);
447 priv->display = gst_gl_display_new ();
449 gtk_gl_area_set_has_alpha (GTK_GL_AREA (gst_widget),
450 !base_widget->ignore_alpha);
456 _get_gl_context (GtkGstGLWidget * gst_widget)
458 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
459 GstGLPlatform platform;
463 gtk_widget_realize (GTK_WIDGET (gst_widget));
465 if (priv->gdk_context)
466 g_object_unref (priv->gdk_context);
467 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
468 if (priv->gdk_context == NULL) {
469 g_assert_not_reached ();
473 g_object_ref (priv->gdk_context);
475 gdk_gl_context_make_current (priv->gdk_context);
477 #if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
478 if (GST_IS_GL_DISPLAY_X11 (priv->display)) {
479 platform = GST_GL_PLATFORM_GLX;
480 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
481 gl_handle = gst_gl_context_get_current_gl_context (platform);
483 priv->other_context =
484 gst_gl_context_new_wrapped (priv->display, gl_handle,
488 #if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
489 if (GST_IS_GL_DISPLAY_WAYLAND (priv->display)) {
490 platform = GST_GL_PLATFORM_EGL;
491 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
492 gl_handle = gst_gl_context_get_current_gl_context (platform);
494 priv->other_context =
495 gst_gl_context_new_wrapped (priv->display, gl_handle,
504 if (priv->other_context) {
505 GError *error = NULL;
507 gst_gl_context_activate (priv->other_context, TRUE);
508 if (!gst_gl_context_fill_info (priv->other_context, &error)) {
509 GST_ERROR ("failed to retreive gdk context info: %s", error->message);
510 g_object_unref (priv->other_context);
511 priv->other_context = NULL;
513 gst_gl_context_activate (priv->other_context, FALSE);
519 gtk_gst_gl_widget_new (void)
521 return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL);
525 gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget)
527 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
529 g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), FALSE);
531 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
533 if (priv->display && priv->gdk_context && priv->other_context) {
534 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
538 if (!priv->other_context) {
539 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
540 _invoke_on_main ((ThreadFunc) _get_gl_context, gst_widget);
541 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
544 if (!GST_GL_IS_CONTEXT (priv->other_context)) {
545 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
549 priv->context = gst_gl_context_new (priv->display);
551 if (!priv->context) {
552 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
556 gst_gl_context_create (priv->context, priv->other_context, NULL);
558 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
563 gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget)
565 if (!gst_widget->priv->other_context)
568 return gst_object_ref (gst_widget->priv->other_context);
572 gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget)
574 if (!gst_widget->priv->context)
577 return gst_object_ref (gst_widget->priv->context);
581 gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget)
583 if (!gst_widget->priv->display)
586 return gst_object_ref (gst_widget->priv->display);