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/video/video.h>
31 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
33 #include <gst/gl/x11/gstgldisplay_x11.h>
34 #include <gst/gl/x11/gstglcontext_glx.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 * @short_description: a #GtkGLArea that renders GStreamer video #GstBuffers
45 * @see_also: #GtkGLArea, #GstBuffer
47 * #GtkGstGLWidget is an #GtkWidget that renders GStreamer video buffers.
50 #define GST_CAT_DEFAULT gtk_gst_gl_widget_debug
51 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
53 G_DEFINE_TYPE_WITH_CODE (GtkGstGLWidget, gtk_gst_gl_widget, GTK_TYPE_GL_AREA,
54 GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "gtkgstglwidget", 0,
55 "Gtk Gst GL Widget"););
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;
74 GstGLOverlayCompositor *overlay_compositor;
77 static const GLfloat vertices[] = {
78 1.0f, 1.0f, 0.0f, 1.0f, 0.0f,
79 -1.0f, 1.0f, 0.0f, 0.0f, 0.0f,
80 -1.0f, -1.0f, 0.0f, 0.0f, 1.0f,
81 1.0f, -1.0f, 0.0f, 1.0f, 1.0f
85 gtk_gst_gl_widget_bind_buffer (GtkGstGLWidget * gst_widget)
87 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
88 const GstGLFuncs *gl = priv->context->gl_vtable;
90 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
92 /* Load the vertex position */
93 gl->VertexAttribPointer (priv->attr_position, 3, GL_FLOAT, GL_FALSE,
94 5 * sizeof (GLfloat), (void *) 0);
96 /* Load the texture coordinate */
97 gl->VertexAttribPointer (priv->attr_texture, 2, GL_FLOAT, GL_FALSE,
98 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat)));
100 gl->EnableVertexAttribArray (priv->attr_position);
101 gl->EnableVertexAttribArray (priv->attr_texture);
105 gtk_gst_gl_widget_unbind_buffer (GtkGstGLWidget * gst_widget)
107 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
108 const GstGLFuncs *gl = priv->context->gl_vtable;
110 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
112 gl->DisableVertexAttribArray (priv->attr_position);
113 gl->DisableVertexAttribArray (priv->attr_texture);
117 gtk_gst_gl_widget_init_redisplay (GtkGstGLWidget * gst_widget)
119 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
120 const GstGLFuncs *gl = priv->context->gl_vtable;
121 GError *error = NULL;
123 gst_gl_insert_debug_marker (priv->other_context, "initializing redisplay");
124 if (!(priv->shader = gst_gl_shader_new_default (priv->context, &error))) {
125 GST_ERROR ("Failed to initialize shader: %s", error->message);
129 priv->attr_position =
130 gst_gl_shader_get_attribute_location (priv->shader, "a_position");
132 gst_gl_shader_get_attribute_location (priv->shader, "a_texcoord");
134 if (gl->GenVertexArrays) {
135 gl->GenVertexArrays (1, &priv->vao);
136 gl->BindVertexArray (priv->vao);
139 gl->GenBuffers (1, &priv->vertex_buffer);
140 gl->BindBuffer (GL_ARRAY_BUFFER, priv->vertex_buffer);
141 gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), vertices,
144 if (gl->GenVertexArrays) {
145 gtk_gst_gl_widget_bind_buffer (gst_widget);
146 gl->BindVertexArray (0);
149 gl->BindBuffer (GL_ARRAY_BUFFER, 0);
151 priv->overlay_compositor =
152 gst_gl_overlay_compositor_new (priv->other_context);
154 priv->initted = TRUE;
158 _redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
160 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
161 const GstGLFuncs *gl = priv->context->gl_vtable;
162 const GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
164 if (gst_widget->base.force_aspect_ratio) {
165 GstVideoRectangle src, dst, result;
166 gint widget_width, widget_height, widget_scale;
168 gl->ClearColor (0.0, 0.0, 0.0, 0.0);
169 gl->Clear (GL_COLOR_BUFFER_BIT);
171 widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget);
172 widget_width = gtk_widget_get_allocated_width ((GtkWidget *) gst_widget);
173 widget_height = gtk_widget_get_allocated_height ((GtkWidget *) gst_widget);
177 src.w = gst_widget->base.display_width;
178 src.h = gst_widget->base.display_height;
182 dst.w = widget_width * widget_scale;
183 dst.h = widget_height * widget_scale;
185 gst_video_sink_center_rect (src, dst, &result, TRUE);
187 gl->Viewport (result.x, result.y, result.w, result.h);
190 gst_gl_shader_use (priv->shader);
192 if (gl->BindVertexArray)
193 gl->BindVertexArray (priv->vao);
194 gtk_gst_gl_widget_bind_buffer (gst_widget);
196 gl->ActiveTexture (GL_TEXTURE0);
197 gl->BindTexture (GL_TEXTURE_2D, tex);
198 gst_gl_shader_set_uniform_1i (priv->shader, "tex", 0);
200 gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
202 if (gl->BindVertexArray)
203 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 g_type_class_add_private (klass, sizeof (GtkGstGLWidgetPrivate));
368 gtk_gst_base_widget_class_init (GTK_GST_BASE_WIDGET_CLASS (klass));
370 gobject_klass->finalize = gtk_gst_gl_widget_finalize;
371 gl_widget_klass->render = gtk_gst_gl_widget_render;
375 gtk_gst_gl_widget_init (GtkGstGLWidget * gst_widget)
377 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (gst_widget);
379 GtkGstGLWidgetPrivate *priv;
381 gtk_gst_base_widget_init (base_widget);
383 gst_widget->priv = priv = GTK_GST_GL_WIDGET_GET_PRIVATE (gst_widget);
385 display = gdk_display_get_default ();
387 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
388 if (GDK_IS_X11_DISPLAY (display))
389 priv->display = (GstGLDisplay *)
390 gst_gl_display_x11_new_with_display (gdk_x11_display_get_xdisplay
393 #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
394 if (GDK_IS_WAYLAND_DISPLAY (display)) {
395 struct wl_display *wayland_display =
396 gdk_wayland_display_get_wl_display (display);
397 priv->display = (GstGLDisplay *)
398 gst_gl_display_wayland_new_with_display (wayland_display);
405 priv->display = gst_gl_display_new ();
407 gtk_gl_area_set_has_alpha (GTK_GL_AREA (gst_widget),
408 !base_widget->ignore_alpha);
412 _get_gl_context (GtkGstGLWidget * gst_widget)
414 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
415 GstGLPlatform platform;
419 gtk_widget_realize (GTK_WIDGET (gst_widget));
421 if (priv->other_context)
422 gst_object_unref (priv->other_context);
423 priv->other_context = NULL;
425 if (priv->gdk_context)
426 g_object_unref (priv->gdk_context);
428 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
429 if (priv->gdk_context == NULL) {
430 GError *error = gtk_gl_area_get_error (GTK_GL_AREA (gst_widget));
432 GST_ERROR_OBJECT (gst_widget, "Error creating GdkGLContext : %s",
433 error ? error->message : "No error set by Gdk");
434 g_clear_error (&error);
438 g_object_ref (priv->gdk_context);
440 gdk_gl_context_make_current (priv->gdk_context);
442 #if GST_GL_HAVE_WINDOW_X11 && GST_GL_HAVE_PLATFORM_GLX && defined (GDK_WINDOWING_X11)
443 if (GST_IS_GL_DISPLAY_X11 (priv->display)) {
444 platform = GST_GL_PLATFORM_GLX;
445 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
446 gl_handle = gst_gl_context_get_current_gl_context (platform);
448 priv->other_context =
449 gst_gl_context_new_wrapped (priv->display, gl_handle,
453 #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
454 if (GST_IS_GL_DISPLAY_WAYLAND (priv->display)) {
455 platform = GST_GL_PLATFORM_EGL;
456 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
457 gl_handle = gst_gl_context_get_current_gl_context (platform);
459 priv->other_context =
460 gst_gl_context_new_wrapped (priv->display, gl_handle,
469 if (priv->other_context) {
470 GError *error = NULL;
472 gst_gl_context_activate (priv->other_context, TRUE);
473 if (!gst_gl_context_fill_info (priv->other_context, &error)) {
474 GST_ERROR ("failed to retrieve gdk context info: %s", error->message);
475 g_clear_error (&error);
476 g_object_unref (priv->other_context);
477 priv->other_context = NULL;
479 gst_gl_context_activate (priv->other_context, FALSE);
485 gtk_gst_gl_widget_new (void)
487 return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL);
491 gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget)
493 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
494 GError *error = NULL;
496 g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), 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 if (!gst_gl_display_create_context (priv->display, priv->other_context,
517 &priv->context, &error)) {
518 g_clear_error (&error);
519 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
523 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
528 gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget)
530 if (!gst_widget->priv->other_context)
533 return gst_object_ref (gst_widget->priv->other_context);
537 gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget)
539 if (!gst_widget->priv->context)
542 return gst_object_ref (gst_widget->priv->context);
546 gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget)
548 if (!gst_widget->priv->display)
551 return gst_object_ref (gst_widget->priv->display);