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path: root/src/wld/wayland.c
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/* wld: wayland.c
 *
 * Copyright (c) 2013, 2014 Michael Forney
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "wayland.h"
#include "wayland-private.h"
#include "wld-private.h"

#include <stdlib.h>
#include <wayland-client.h>

struct wayland_buffer
{
    struct wld_exporter exporter;
    struct wld_destructor destructor;
    struct wl_buffer * wl;
};

struct wayland_buffer_socket
{
    struct buffer_socket base;
    struct wl_buffer_listener listener;
    struct wld_surface * surface;
    struct wl_surface * wl;
    struct wl_display * display;
    struct wl_event_queue * queue;
};

static bool buffer_socket_attach(struct buffer_socket * socket,
                                 struct buffer * buffer);
static void buffer_socket_process(struct buffer_socket * socket);
static void buffer_socket_destroy(struct buffer_socket * socket);

static const struct buffer_socket_impl buffer_socket_impl = {
    .attach = &buffer_socket_attach,
    .process = &buffer_socket_process,
    .destroy = &buffer_socket_destroy
};

IMPL(wayland_buffer_socket, buffer_socket)

static void buffer_release(void *data, struct wl_buffer *buffer);

const static struct wayland_impl * impls[] = {
#if WITH_WAYLAND_DRM
    [WLD_DRM] = &drm_wayland_impl,
#endif

#if WITH_WAYLAND_SHM
    [WLD_SHM] = &shm_wayland_impl,
#endif
};

enum wld_wayland_interface_id interface_id(const char * string)
{
    if (strcmp(string, "drm") == 0)
        return WLD_DRM;
    if (strcmp(string, "shm") == 0)
        return WLD_SHM;

    fprintf(stderr, "Unknown Wayland interface specified: '%s'\n", string);

    return WLD_NONE;
}

EXPORT
struct wld_context * wld_wayland_create_context
    (struct wl_display * display, enum wld_wayland_interface_id id, ...)
{
    struct wayland_context * context = NULL;
    struct wl_event_queue * queue;
    va_list requested_impls;
    bool impls_tried[ARRAY_LENGTH(impls)] = {0};
    const char * interface_string;

    if (!(queue = wl_display_create_queue(display)))
        return NULL;

    if ((interface_string = getenv("WLD_WAYLAND_INTERFACE")))
    {
        id = interface_id(interface_string);

        if ((context = impls[id]->create_context(display, queue)))
            return &context->base;

        fprintf(stderr, "Could not create context for Wayland interface '%s'\n",
                interface_string);

        return NULL;
    }

    va_start(requested_impls, id);

    while (id >= 0)
    {
        if (impls_tried[id] || !impls[id])
            continue;

        if ((context = impls[id]->create_context(display, queue)))
            goto done;

        impls_tried[id] = true;
        id = va_arg(requested_impls, enum wld_wayland_interface_id);
    }

    va_end(requested_impls);

    /* If the user specified WLD_ANY, try any remaining implementations. */
    if (!context && id == WLD_ANY)
    {
        for (id = 0; id < ARRAY_LENGTH(impls); ++id)
        {
            if (impls_tried[id] || !impls[id])
                continue;

            if ((context = impls[id]->create_context(display, queue)))
                break;
        }
    }

    if (!context)
    {
        DEBUG("Could not initialize any of the specified implementations\n");
        return NULL;
    }

  done:
    context->impl = impls[id];
    context->display = display;
    context->queue = queue;

    return &context->base;
}

EXPORT
struct wld_surface * wld_wayland_create_surface(struct wld_context * context,
                                                uint32_t width, uint32_t height,
                                                uint32_t format, uint32_t flags,
                                                struct wl_surface * wl)
{
    struct wayland_buffer_socket * socket;

    if (!(socket = malloc(sizeof *socket)))
        goto error0;

    socket->base.impl = &buffer_socket_impl;
    socket->listener.release = &buffer_release;
    socket->wl = wl;
    socket->queue = ((struct wayland_context *) context)->queue;
    socket->display = ((struct wayland_context *) context)->display;
    socket->surface = buffered_surface_create(context, width, height, format,
                                              flags, &socket->base);

    if (!socket->surface)
        goto error1;

    return socket->surface;

  error1:
    free(socket);
  error0:
    return NULL;
}

EXPORT
bool wld_wayland_has_format(struct wld_context * base, uint32_t format)
{
    struct wayland_context * context = (void *) base;

    return context->impl->has_format(base, format);
}

static bool buffer_export(struct wld_exporter * exporter,
                          struct wld_buffer * buffer,
                          uint32_t type, union wld_object * object)
{
    struct wayland_buffer * wayland_buffer
        = CONTAINER_OF(exporter, struct wayland_buffer, exporter);

    switch (type)
    {
        case WLD_WAYLAND_OBJECT_BUFFER:
            object->ptr = wayland_buffer->wl;
            return true;
        default: return false;
    }
}

static void buffer_destroy(struct wld_destructor * destructor)
{
    struct wayland_buffer * wayland_buffer
        = CONTAINER_OF(destructor, struct wayland_buffer, destructor);

    wl_buffer_destroy(wayland_buffer->wl);
    free(wayland_buffer);
}

bool wayland_buffer_add_exporter(struct buffer * buffer, struct wl_buffer * wl)
{
    struct wayland_buffer * wayland_buffer;

    if (!(wayland_buffer = malloc(sizeof *wayland_buffer)))
        return false;

    wayland_buffer->wl = wl;
    wayland_buffer->exporter.export = &buffer_export;
    wld_buffer_add_exporter(&buffer->base, &wayland_buffer->exporter);
    wayland_buffer->destructor.destroy = &buffer_destroy;
    wld_buffer_add_destructor(&buffer->base, &wayland_buffer->destructor);

    return true;
}

bool buffer_socket_attach(struct buffer_socket * base, struct buffer * buffer)
{
    struct wayland_buffer_socket * socket = wayland_buffer_socket(base);
    struct wl_buffer * wl;
    union wld_object object;

    if (!wld_export(&buffer->base, WLD_WAYLAND_OBJECT_BUFFER, &object))
        return false;

    wl = object.ptr;

    if (!wl_proxy_get_listener((struct wl_proxy *) wl))
        wl_buffer_add_listener(wl, &socket->listener, buffer);

    wl_surface_attach(socket->wl, wl, 0, 0);

    if (pixman_region32_not_empty(&buffer->base.damage))
    {
        pixman_box32_t * box;
        int num_boxes;

        box = pixman_region32_rectangles(&buffer->base.damage, &num_boxes);

        while (num_boxes--)
        {
            wl_surface_damage(socket->wl, box->x1, box->y1,
                              box->x2 - box->x1, box->y2 - box->y1);
        }
    }

    wl_surface_commit(socket->wl);

    return true;
}

void buffer_socket_process(struct buffer_socket * base)
{
    struct wayland_buffer_socket * socket = wayland_buffer_socket(base);

    /* Since events for our wl_buffers lie in a special queue used by WLD, we
     * must dispatch these events here so that we see any release events before
     * the next back buffer is chosen. */
    wl_display_dispatch_queue_pending(socket->display, socket->queue);
}

void buffer_socket_destroy(struct buffer_socket * socket)
{
    free(socket);
}

void sync_done(void * data, struct wl_callback * callback, uint32_t msecs)
{
    bool * done = data;

    *done = true;
    wl_callback_destroy(callback);
}

void buffer_release(void * data, struct wl_buffer * wl)
{
    struct wld_buffer * buffer = data;
    const struct wl_buffer_listener * listener
        = wl_proxy_get_listener((struct wl_proxy *) wl);
    struct wayland_buffer_socket * socket
        = CONTAINER_OF(listener, struct wayland_buffer_socket, listener);

    wld_surface_release(socket->surface, buffer);
}