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 && defined (GDK_WINDOWING_X11)
34 #include <gst/gl/x11/gstgldisplay_x11.h>
37 #if GST_GL_HAVE_WINDOW_WAYLAND && 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,
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);
205 gtk_gst_gl_widget_unbind_buffer (gst_widget);
207 gl->BindTexture (GL_TEXTURE_2D, 0);
211 _draw_black (GstGLContext * context)
213 const GstGLFuncs *gl = context->gl_vtable;
215 gst_gl_insert_debug_marker (context, "no buffer. rendering black");
216 gl->ClearColor (0.0, 0.0, 0.0, 0.0);
217 gl->Clear (GL_COLOR_BUFFER_BIT);
221 gtk_gst_gl_widget_render (GtkGLArea * widget, GdkGLContext * context)
223 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (widget)->priv;
224 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (widget);
226 GTK_GST_BASE_WIDGET_LOCK (widget);
228 if (!priv->context || !priv->other_context)
231 gst_gl_context_activate (priv->other_context, TRUE);
234 gtk_gst_gl_widget_init_redisplay (GTK_GST_GL_WIDGET (widget));
236 if (!priv->initted || !base_widget->negotiated) {
237 _draw_black (priv->other_context);
241 /* Upload latest buffer */
242 if (base_widget->pending_buffer) {
243 GstBuffer *buffer = base_widget->pending_buffer;
244 GstVideoFrame gl_frame;
245 GstGLSyncMeta *sync_meta;
247 if (!gst_video_frame_map (&gl_frame, &base_widget->v_info, buffer,
248 GST_MAP_READ | GST_MAP_GL)) {
249 _draw_black (priv->other_context);
253 priv->current_tex = *(guint *) gl_frame.data[0];
254 gst_gl_insert_debug_marker (priv->other_context, "redrawing texture %u",
257 gst_gl_overlay_compositor_upload_overlays (priv->overlay_compositor,
260 sync_meta = gst_buffer_get_gl_sync_meta (buffer);
262 /* XXX: the set_sync() seems to be needed for resizing */
263 gst_gl_sync_meta_set_sync_point (sync_meta, priv->context);
264 gst_gl_sync_meta_wait (sync_meta, priv->other_context);
267 gst_video_frame_unmap (&gl_frame);
269 if (base_widget->buffer)
270 gst_buffer_unref (base_widget->buffer);
272 /* Keep the buffer to ensure current_tex stay valid */
273 base_widget->buffer = buffer;
274 base_widget->pending_buffer = NULL;
277 GST_DEBUG ("rendering buffer %p with gdk context %p",
278 base_widget->buffer, context);
280 _redraw_texture (GTK_GST_GL_WIDGET (widget), priv->current_tex);
281 gst_gl_overlay_compositor_draw_overlays (priv->overlay_compositor);
283 gst_gl_insert_debug_marker (priv->other_context, "texture %u redrawn",
287 if (priv->other_context)
288 gst_gl_context_activate (priv->other_context, FALSE);
290 GTK_GST_BASE_WIDGET_UNLOCK (widget);
295 _reset_gl (GtkGstGLWidget * gst_widget)
297 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
298 const GstGLFuncs *gl = priv->other_context->gl_vtable;
300 if (!priv->gdk_context)
301 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
303 if (priv->gdk_context == NULL)
306 gdk_gl_context_make_current (priv->gdk_context);
307 gst_gl_context_activate (priv->other_context, TRUE);
310 gl->DeleteVertexArrays (1, &priv->vao);
314 if (priv->vertex_buffer) {
315 gl->DeleteBuffers (1, &priv->vertex_buffer);
316 priv->vertex_buffer = 0;
320 gst_object_unref (priv->upload);
325 gst_object_unref (priv->shader);
329 if (priv->overlay_compositor)
330 gst_object_unref (priv->overlay_compositor);
332 gst_gl_context_activate (priv->other_context, FALSE);
334 gst_object_unref (priv->other_context);
335 priv->other_context = NULL;
337 gdk_gl_context_clear_current ();
339 g_object_unref (priv->gdk_context);
340 priv->gdk_context = NULL;
344 gtk_gst_gl_widget_finalize (GObject * object)
346 GtkGstGLWidgetPrivate *priv = GTK_GST_GL_WIDGET (object)->priv;
347 GtkGstBaseWidget *base_widget = GTK_GST_BASE_WIDGET (object);
349 if (priv->other_context)
350 gst_gtk_invoke_on_main ((GThreadFunc) _reset_gl, base_widget);
353 gst_object_unref (priv->context);
356 gst_object_unref (priv->display);
358 gtk_gst_base_widget_finalize (object);
359 G_OBJECT_CLASS (gtk_gst_gl_widget_parent_class)->finalize (object);
363 gtk_gst_gl_widget_class_init (GtkGstGLWidgetClass * klass)
365 GObjectClass *gobject_klass = (GObjectClass *) klass;
366 GtkGLAreaClass *gl_widget_klass = (GtkGLAreaClass *) klass;
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_instance_private (gst_widget);
385 display = gdk_display_get_default ();
387 #if GST_GL_HAVE_WINDOW_X11 && 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
394 #if GST_GL_HAVE_WINDOW_WAYLAND && defined (GDK_WINDOWING_WAYLAND)
395 if (GDK_IS_WAYLAND_DISPLAY (display)) {
396 struct wl_display *wayland_display =
397 gdk_wayland_display_get_wl_display (display);
398 priv->display = (GstGLDisplay *)
399 gst_gl_display_wayland_new_with_display (wayland_display);
406 priv->display = gst_gl_display_new ();
408 GST_INFO ("Created %" GST_PTR_FORMAT, priv->display);
410 gtk_gl_area_set_has_alpha (GTK_GL_AREA (gst_widget),
411 !base_widget->ignore_alpha);
415 _get_gl_context (GtkGstGLWidget * gst_widget)
417 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
418 GstGLPlatform platform = GST_GL_PLATFORM_NONE;
419 GstGLAPI gl_api = GST_GL_API_NONE;
420 guintptr gl_handle = 0;
422 gtk_widget_realize (GTK_WIDGET (gst_widget));
424 if (priv->other_context)
425 gst_object_unref (priv->other_context);
426 priv->other_context = NULL;
428 if (priv->gdk_context)
429 g_object_unref (priv->gdk_context);
431 priv->gdk_context = gtk_gl_area_get_context (GTK_GL_AREA (gst_widget));
432 if (priv->gdk_context == NULL) {
433 GError *error = gtk_gl_area_get_error (GTK_GL_AREA (gst_widget));
435 GST_ERROR_OBJECT (gst_widget, "Error creating GdkGLContext : %s",
436 error ? error->message : "No error set by Gdk");
437 g_clear_error (&error);
441 g_object_ref (priv->gdk_context);
443 gdk_gl_context_make_current (priv->gdk_context);
445 #if GST_GL_HAVE_WINDOW_X11 && defined (GDK_WINDOWING_X11)
446 if (GST_IS_GL_DISPLAY_X11 (priv->display)) {
447 #if GST_GL_HAVE_PLATFORM_GLX
449 platform = GST_GL_PLATFORM_GLX;
450 gl_handle = gst_gl_context_get_current_gl_context (platform);
454 #if GST_GL_HAVE_PLATFORM_EGL
456 platform = GST_GL_PLATFORM_EGL;
457 gl_handle = gst_gl_context_get_current_gl_context (platform);
462 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
463 priv->other_context =
464 gst_gl_context_new_wrapped (priv->display, gl_handle,
469 #if GST_GL_HAVE_WINDOW_WAYLAND && GST_GL_HAVE_PLATFORM_EGL && defined (GDK_WINDOWING_WAYLAND)
470 if (GST_IS_GL_DISPLAY_WAYLAND (priv->display)) {
471 platform = GST_GL_PLATFORM_EGL;
472 gl_api = gst_gl_context_get_current_gl_api (platform, NULL, NULL);
473 gl_handle = gst_gl_context_get_current_gl_context (platform);
475 priv->other_context =
476 gst_gl_context_new_wrapped (priv->display, gl_handle,
485 if (priv->other_context) {
486 GError *error = NULL;
488 GST_INFO ("Retrieved Gdk OpenGL context %" GST_PTR_FORMAT,
489 priv->other_context);
490 gst_gl_context_activate (priv->other_context, TRUE);
491 if (!gst_gl_context_fill_info (priv->other_context, &error)) {
492 GST_ERROR ("failed to retrieve gdk context info: %s", error->message);
493 g_clear_error (&error);
494 g_object_unref (priv->other_context);
495 priv->other_context = NULL;
497 gst_gl_context_activate (priv->other_context, FALSE);
500 GST_WARNING ("Could not retrieve Gdk OpenGL context");
505 gtk_gst_gl_widget_new (void)
507 return (GtkWidget *) g_object_new (GTK_TYPE_GST_GL_WIDGET, NULL);
511 gtk_gst_gl_widget_init_winsys (GtkGstGLWidget * gst_widget)
513 GtkGstGLWidgetPrivate *priv = gst_widget->priv;
514 GError *error = NULL;
516 g_return_val_if_fail (GTK_IS_GST_GL_WIDGET (gst_widget), FALSE);
517 g_return_val_if_fail (priv->display != NULL, FALSE);
519 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
521 if (priv->display && priv->gdk_context && priv->other_context) {
522 GST_TRACE ("have already initialized contexts");
523 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
527 if (!priv->other_context) {
528 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
529 gst_gtk_invoke_on_main ((GThreadFunc) _get_gl_context, gst_widget);
530 GTK_GST_BASE_WIDGET_LOCK (gst_widget);
533 if (!GST_IS_GL_CONTEXT (priv->other_context)) {
534 GST_FIXME ("Could not retrieve Gdk OpenGL context");
535 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
539 GST_OBJECT_LOCK (priv->display);
540 if (!gst_gl_display_create_context (priv->display, priv->other_context,
541 &priv->context, &error)) {
542 GST_WARNING ("Could not create OpenGL context: %s",
543 error ? error->message : "Unknown");
544 g_clear_error (&error);
545 GST_OBJECT_UNLOCK (priv->display);
546 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
549 gst_gl_display_add_context (priv->display, priv->context);
550 GST_OBJECT_UNLOCK (priv->display);
552 GTK_GST_BASE_WIDGET_UNLOCK (gst_widget);
557 gtk_gst_gl_widget_get_gtk_context (GtkGstGLWidget * gst_widget)
559 if (!gst_widget->priv->other_context)
562 return gst_object_ref (gst_widget->priv->other_context);
566 gtk_gst_gl_widget_get_context (GtkGstGLWidget * gst_widget)
568 if (!gst_widget->priv->context)
571 return gst_object_ref (gst_widget->priv->context);
575 gtk_gst_gl_widget_get_display (GtkGstGLWidget * gst_widget)
577 if (!gst_widget->priv->display)
580 return gst_object_ref (gst_widget->priv->display);