File: overlay_dmabuf.c

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/*
 * gxr
 * Copyright 2018 Collabora Ltd.
 * Author: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
 * SPDX-License-Identifier: MIT
 */

#include <glib.h>
#include <gdk/gdk.h>

#include <amdgpu_drm.h>
#include <amdgpu.h>

#include <fcntl.h>

#include "gxr.h"

#include "dmabuf_content.h"

static GulkanTexture *texture;

static gboolean
timeout_callback (gpointer data)
{
  GxrOverlay *overlay = (GxrOverlay*) data;
  gxr_overlay_poll_event (overlay);
  return TRUE;
}

static void*
allocate_dmabuf_amd (gsize size, int *fd)
{
  amdgpu_device_handle amd_dev;
  amdgpu_bo_handle amd_bo;

  /* use render node to avoid needing to authenticate: */
  int dev_fd = open ("/dev/dri/renderD128", 02, 0);

  uint32_t major_version;
  uint32_t minor_version;
  int ret = amdgpu_device_initialize (dev_fd,
                                     &major_version,
                                     &minor_version,
                                     &amd_dev);
  if (ret < 0)
    {
      g_printerr ("Could not create amdgpu device: %s\n", strerror (-ret));
      return NULL;
    }

  g_print ("Initialized amdgpu drm device with fd %d. Version %d.%d\n",
           dev_fd, major_version, minor_version);

  struct amdgpu_bo_alloc_request alloc_buffer =
  {
    .alloc_size = (uint64_t) size,
    .preferred_heap = AMDGPU_GEM_DOMAIN_GTT,
  };

  ret = amdgpu_bo_alloc (amd_dev, &alloc_buffer, &amd_bo);
  if (ret < 0)
    {
      g_printerr ("amdgpu_bo_alloc failed: %s\n", strerror(-ret));
      return NULL;
    }

  uint32_t shared_handle;
  ret = amdgpu_bo_export (amd_bo,
                          amdgpu_bo_handle_type_dma_buf_fd,
                         &shared_handle);

  if (ret < 0)
    {
      g_printerr ("amdgpu_bo_export failed: %s\n", strerror (-ret));
      return NULL;
    }

  *fd = (int) shared_handle;
  void *cpu_buffer;
  ret = amdgpu_bo_cpu_map (amd_bo, &cpu_buffer);

  if (ret < 0)
    {
      g_printerr ("amdgpu_bo_cpu_map failed: %s\n", strerror (-ret));
      return NULL;
    }

  return cpu_buffer;
}

static void
_press_cb (GxrOverlay  *overlay,
           GdkEventButton *event,
           gpointer        data)
{
  (void) overlay;
  g_print ("press: %d %f %f (%d)\n",
           event->button, event->x, event->y, event->time);
  GMainLoop *loop = (GMainLoop*) data;
  g_main_loop_quit (loop);
}

static void
_show_cb (GxrOverlay *overlay,
          gpointer    data)
{
  (void) data;
  g_print ("show\n");

  /* skip rendering if the overlay isn't available or visible */
  gboolean is_invisible = !gxr_overlay_is_visible (overlay) &&
                          !gxr_overlay_thumbnail_is_visible (overlay);

  if (is_invisible)
    return;

  gxr_overlay_submit_texture (overlay, texture);
}

static void
_destroy_cb (GxrOverlay *overlay,
             gpointer       data)
{
  (void) overlay;
  g_print ("destroy\n");
  GMainLoop *loop = (GMainLoop*) data;
  g_main_loop_quit (loop);
}

#define ALIGN(_v, _d) (((_v) + ((_d) - 1)) & ~((_d) - 1))

int
main ()
{
  GMainLoop *loop = g_main_loop_new (NULL, FALSE);

  /* create dmabuf */
  uint32_t width = 512;
  uint32_t height = 512;

  int fd = -1;
  guint stride = (guint) ALIGN ((int)width, 32) * 4;
  gsize size = stride * height;
  char* map = (char*) allocate_dmabuf_amd (size, &fd);

  dma_buf_fill (map, width, height, stride);

  GxrContext *context = gxr_context_new (GXR_APP_OVERLAY, "Overlay Dma-Buf", 1);

  GulkanClient *client = gxr_context_get_gulkan (context);

  VkExtent2D extent = { width, height };

  texture = gulkan_texture_new_from_dmabuf (client, fd, extent,
                                            VK_FORMAT_B8G8R8A8_UNORM);
  if (texture == NULL)
    {
      g_printerr ("Unable to initialize vulkan dmabuf texture.\n");
      return -1;
    }

  if (!gulkan_texture_transfer_layout (texture,
                                       VK_IMAGE_LAYOUT_UNDEFINED,
                                       VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL))
    {
      g_printerr ("Unable to transfer layout.\n");
      return -1;
    }

  GxrOverlay *overlay = gxr_overlay_new (context, "vulkan.dmabuf");
  if (!overlay)
    {
      g_printerr ("Overlay unavailable.\n");
      return -1;
    }

  g_signal_connect (overlay, "button-press-event", (GCallback) _press_cb, loop);
  g_signal_connect (overlay, "show", (GCallback) _show_cb, NULL);
  g_signal_connect (overlay, "destroy", (GCallback) _destroy_cb, loop);

  g_timeout_add (20, timeout_callback, overlay);
  g_main_loop_run (loop);
  g_main_loop_unref (loop);

  g_print ("bye\n");

  g_object_unref (overlay);
  g_object_unref (texture);
  g_object_unref (context);

  return 0;
}