Minimal WPE launcher using libcogcore

minicog.c

/*
 * SPDX-License-Identifier: MIT
 *
 * cc -o minicog minicog.c $(pkg-config wpe-webkit-1.1 cogcore --cflags --libs)
 */

#include <cog/cog.h>

static const char *s_starturl = NULL;

static WebKitWebView*
on_create_view(CogShell *shell, CogPlatform *platform)
{
    g_autoptr(GError) error = NULL;
    WebKitWebViewBackend *view_backend = cog_platform_get_view_backend(platform, NULL, &error);
    if (!view_backend)
        g_error("Cannot obtain view backend: %s", error->message);

    g_autoptr(WebKitWebView) web_view =
        g_object_new(WEBKIT_TYPE_WEB_VIEW,
                     "settings", cog_shell_get_web_settings(shell),
                     "web-context", cog_shell_get_web_context(shell),
                     "backend", view_backend,
                     NULL);
    cog_platform_init_web_view(platform, web_view);
    webkit_web_view_load_uri(web_view, s_starturl);
    return g_steal_pointer(&web_view);
}

int
main(int argc, char *argv[])
{
    g_set_application_name("minicog");

    if (argc != 2 && argc != 3) {
        g_printerr("Usage: %s [URL [platform]]\n", argv[0]);
        return EXIT_FAILURE;
    }

    g_autoptr(GError) error = NULL;
    if (!(s_starturl = cog_uri_guess_from_user_input(argv[1], TRUE, &error)))
        g_error("Invalid URL '%s': %s", argv[1], error->message);

    cog_modules_add_directory(COG_MODULEDIR);

    g_autoptr(GApplication) app = g_application_new(NULL, G_APPLICATION_DEFAULT_FLAGS);
    g_autoptr(CogShell) shell = cog_shell_new("minicog", FALSE);
    g_autoptr(CogPlatform) platform =
        cog_platform_new((argc == 3) ? argv[2] : g_getenv("COG_PLATFORM"), &error);
    if (!platform)
        g_error("Cannot create platform: %s", error->message);

    if (!cog_platform_setup(platform, shell, "", &error))
        g_error("Cannot setup platform: %s\n", error->message);

    g_signal_connect(shell, "create-view", G_CALLBACK(on_create_view), platform);
    g_signal_connect_swapped(app, "shutdown", G_CALLBACK(cog_shell_shutdown), shell);
    g_signal_connect_swapped(app, "startup", G_CALLBACK(cog_shell_startup), shell);
    g_signal_connect(app, "activate", G_CALLBACK(g_application_hold), NULL);

    return g_application_run(app, 1, argv);
}

Hello,

Running this on a raspberry pi 3b+ (./app index.html drm), with a yocto build image with Mesa VC4 driver, DRM and wpebackend-fdo, I only get the mouse cursor; the web page doesn't show on the framebuffer.

If I run cog -P index.html it works tho. Any idea?

I'm using wpewebkit-2.0

Do you pass anything after the -P? I suppose you use -P drm.

Things should work the same in theory, because this sample application reused libcogcore.so and its plug-ins. Could you run the same command adding G_MESSAGES_DEBUG in the environment to get some debug logging? Like this:

G_MESSAGES_DEBUG='Cog-Core Cog-DRM' ./app index.html drm

Thanks for replying.

Do you pass anything after the -P? I suppose you use -P drm.

I do, indeed, pass drm after -P. Typing too fast here.

Things should work the same in theory, because this sample application reused libcogcore.so and its plug-ins. Could you run the same command adding G_MESSAGES_DEBUG in the environment to get some debug logging? Like this:

G_MESSAGES_DEBUG='Cog-Core Cog-DRM' ./app index.html drm

I finally have time to look back at this; first off, there are a few things that seem to have disappeared in the version of libcogcore (12.0.0, cog version 0.19.1) i'm using.
The following are undefined:
cog_shell_shutdown
cog_shell_startup
cog_platform_new

So i commented out the two lines with g_signal_connect_swapped and replaced the call to cog_platform_new with:

cog_init((argc == 3) ? argv[2] : g_getenv("COG_PLATFORM"), NULL);
g_autoptr(CogPlatform) platform = cog_platform_get();

Now, running :

G_MESSAGES_DEBUG='Cog-Core Cog-DRM' ./app index.html drm

gives :

(process:20882): Cog-Core-DEBUG: 12:02:42.752: ensure_extension_points: Extension points registered.
(process:20882): Cog-Core-DEBUG: 12:02:42.753: cog_modules_add_directory: Scanning '/usr/lib/cog/modules'
(process:20882): Cog-Core-DEBUG: 12:02:42.780: cog_modules_add_directory: Default path already added, skipping.
(process:20882): Cog-Core-DEBUG: 12:02:42.780: cog_modules_add_directory: Default path already added, skipping.
(process:20882): Cog-Core-DEBUG: 12:02:42.780: ensure_builtin_types: Built-in platform types initialized.
(process:20882): Cog-Core-DEBUG: 12:02:42.780: cog_modules_add_directory: Default path already added, skipping.
(process:20882): Cog-Core-DEBUG: 12:02:42.789: cog_platform_ensure_singleton: drm requested, CogDrmPlatform chosen.
(process:20882): Cog-DRM-DEBUG: 12:02:42.789: init_config: overriding device_scale value, using 0.00 from shell
(process:20882): Cog-DRM-DEBUG: 12:02:42.790: init_drm: enumerated device 0x5ed0d8, available_nodes 5
(process:20882): Cog-DRM-DEBUG: 12:02:42.790: init_drm:   DRM_NODE_PRIMARY: /dev/dri/card0
(process:20882): Cog-DRM-DEBUG: 12:02:42.790: init_drm:   DRM_NODE_RENDER: /dev/dri/renderD128
(process:20882): Cog-DRM-DEBUG: 12:02:42.790: init_drm: using device 0x5ed0d8, DRM_NODE_PRIMARY /dev/dri/card0
(process:20882): Cog-DRM-DEBUG: 12:02:42.790: init_drm: 1 connectors available
(process:20882): Cog-DRM-DEBUG: 12:02:42.818: init_drm:  connector id 89, type 11, connected, 44 usable modes
(process:20882): Cog-DRM-DEBUG: 12:02:42.818: init_drm:    [0]: '1920x1080', 1920x1080@60, flags 5, type 72 (preferred)
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [1]: '1920x1080', 1920x1080@60, flags 1048581, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [2]: '1920x1080', 1920x1080@60, flags 1048581, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [3]: '1920x1080i', 1920x1080@60, flags 1048597, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [4]: '1920x1080i', 1920x1080@60, flags 1048597, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [5]: '1920x1080', 1920x1080@50, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [6]: '1920x1080', 1920x1080@50, flags 1048581, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [7]: '1920x1080i', 1920x1080@50, flags 21, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.819: init_drm:    [8]: '1920x1080i', 1920x1080@50, flags 1048597, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [9]: '1600x1200', 1600x1200@60, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [10]: '1680x1050', 1680x1050@60, flags 9, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [11]: '1280x1024', 1280x1024@75, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [12]: '1280x1024', 1280x1024@60, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [13]: '1440x900', 1440x900@60, flags 9, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [14]: '1280x960', 1280x960@60, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [15]: '1152x864', 1152x864@75, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [16]: '1280x720', 1280x720@60, flags 1048581, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [17]: '1280x720', 1280x720@60, flags 1048581, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [18]: '1280x720', 1280x720@50, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.820: init_drm:    [19]: '1280x720', 1280x720@50, flags 1048581, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [20]: '1152x720', 1152x720@60, flags 6, type 0
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [21]: '1024x768', 1024x768@75, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [22]: '1024x768', 1024x768@60, flags 10, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [23]: '832x624', 832x624@75, flags 10, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [24]: '800x600', 800x600@75, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [25]: '800x600', 800x600@60, flags 5, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [26]: '720x576', 720x576@50, flags 10, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [27]: '720x576', 720x576@50, flags 524298, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [28]: '720x576', 720x576@50, flags 1048586, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [29]: '720x576i', 720x576@50, flags 528410, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [30]: '720x576i', 720x576@50, flags 1052698, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [31]: '720x480', 720x480@60, flags 1048586, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [32]: '720x480', 720x480@60, flags 524298, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [33]: '720x480', 720x480@60, flags 1048586, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.821: init_drm:    [34]: '720x480', 720x480@60, flags 524298, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [35]: '720x480i', 720x480@60, flags 528410, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [36]: '720x480i', 720x480@60, flags 1052698, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [37]: '720x480i', 720x480@60, flags 528410, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [38]: '720x480i', 720x480@60, flags 1052698, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [39]: '640x480', 640x480@75, flags 10, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [40]: '640x480', 640x480@60, flags 524298, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [41]: '640x480', 640x480@60, flags 10, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [42]: '640x480', 640x480@60, flags 524298, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.822: init_drm:    [43]: '720x400', 720x400@70, flags 6, type 64
(process:20882): Cog-DRM-DEBUG: 12:02:42.850: init_drm: using connector id 89, type 11
(process:20882): Cog-DRM-DEBUG: 12:02:42.850: init_drm: using mode [0] '1920x1080' @ 60Hz
libGL: Can't open configuration file /etc/drirc: No such file or directory.
libGL: Can't open configuration file /root/.drirc: No such file or directory.
libGL: Can't open configuration file /etc/drirc: No such file or directory.
libGL: Can't open configuration file /root/.drirc: No such file or directory.
libGL: Can't open configuration file /etc/drirc: No such file or directory.
libGL: Can't open configuration file /root/.drirc: No such file or directory.
libGL: Can't open configuration file /etc/drirc: No such file or directory.
libGL: Can't open configuration file /root/.drirc: No such file or directory.
libEGL warning: Unrecognized EGL_LOG_LEVEL environment variable value. Expected one of "fatal", "warning", "info", "debug". Got "". Falling back to "warning".
(process:20882): Cog-DRM-DEBUG: 12:02:42.932: cog_drm_modeset_renderer_new: Capability addfb2_modifiers = 0x1
(process:20882): Cog-DRM-DEBUG: 12:02:42.932: cog_drm_modeset_renderer_new: Using plane #31, crtc #87, connector #89 (atomic).

(process:20882): Cog-DRM-WARNING **: 12:02:42.932: Renderer 'modeset' does not support rotation 0 (0 degrees).
(process:20882): Cog-DRM-DEBUG: 12:02:42.951: cog_drm_platform_setup: Renderer 'modeset' initialized.
(process:20882): Cog-Core-DEBUG: 12:02:42.951: gamepad setup: none

(process:20882): GLib-GObject-CRITICAL **: 12:02:42.951: /usr/src/debug/glib-2.0/2.78.6/gobject/gsignal.c:2625: signal 'create-view' is invalid for instance '0x5e7578' of type 'CogShell'

Commenting out the line that connect the signal for create-view doesn't fix it; it only make the critical message disappear.