/*
 * Copyright © 2011 Intel Corporation
 *
 * 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 (including the next
 * paragraph) 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.
 *
 * Authors:
 *    Kristian Høgsberg <krh@bitplanet.net>
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <xf86drm.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include "egl_dri2.h"

static _EGLImage *
dri2_create_image_khr_pixmap(_EGLDisplay *disp, _EGLContext *ctx,
			     EGLClientBuffer buffer, const EGLint *attr_list)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
   struct gbm_dri_bo *dri_bo = gbm_dri_bo((struct gbm_bo *) buffer);
   struct dri2_egl_image *dri2_img;

   dri2_img = malloc(sizeof *dri2_img);
   if (!dri2_img) {
      _eglError(EGL_BAD_ALLOC, "dri2_create_image_khr_pixmap");
      return NULL;
   }

   if (!_eglInitImage(&dri2_img->base, disp)) {
      free(dri2_img);
      return NULL;
   }

   dri2_img->dri_image = dri2_dpy->image->dupImage(dri_bo->image, dri2_img);
   if (dri2_img->dri_image == NULL) {
      free(dri2_img);
      _eglError(EGL_BAD_ALLOC, "dri2_create_image_khr_pixmap");
      return NULL;
   }

   return &dri2_img->base;
}

static _EGLImage *
dri2_drm_create_image_khr(_EGLDriver *drv, _EGLDisplay *disp,
                          _EGLContext *ctx, EGLenum target,
                          EGLClientBuffer buffer, const EGLint *attr_list)
{
   (void) drv;

   switch (target) {
   case EGL_NATIVE_PIXMAP_KHR:
      return dri2_create_image_khr_pixmap(disp, ctx, buffer, attr_list);
   default:
      return dri2_create_image_khr(drv, disp, ctx, target, buffer, attr_list);
   }
}

static int
dri2_drm_authenticate(_EGLDisplay *disp, uint32_t id)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);

   return drmAuthMagic(dri2_dpy->fd, id);
}

EGLBoolean
dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
{
   struct dri2_egl_display *dri2_dpy;
   struct gbm_device *gbm;
   int fd = -1;
   int i;

   dri2_dpy = malloc(sizeof *dri2_dpy);
   if (!dri2_dpy)
      return _eglError(EGL_BAD_ALLOC, "eglInitialize");

   memset(dri2_dpy, 0, sizeof *dri2_dpy);

   disp->DriverData = (void *) dri2_dpy;

   gbm = disp->PlatformDisplay;
   if (gbm == NULL) {
      fd = open("/dev/dri/card0", O_RDWR);
      dri2_dpy->own_device = 1;
      gbm = gbm_create_device(fd);
      if (gbm == NULL)
         return EGL_FALSE;
   }

   if (strcmp(gbm_device_get_backend_name(gbm), "drm") != 0) {
      free(dri2_dpy);
      return EGL_FALSE;
   }

   dri2_dpy->gbm_dri = gbm_dri_device(gbm);
   if (dri2_dpy->gbm_dri->base.type != GBM_DRM_DRIVER_TYPE_DRI) {
      free(dri2_dpy);
      return EGL_FALSE;
   }

   if (fd < 0) {
      fd = dup(gbm_device_get_fd(gbm));
      if (fd < 0) {
         free(dri2_dpy);
         return EGL_FALSE;
      }
   }

   dri2_dpy->fd = fd;
   dri2_dpy->device_name = dri2_get_device_name_for_fd(dri2_dpy->fd);
   dri2_dpy->driver_name = dri2_dpy->gbm_dri->base.driver_name;

   dri2_dpy->dri_screen = dri2_dpy->gbm_dri->screen;
   dri2_dpy->core = dri2_dpy->gbm_dri->core;
   dri2_dpy->dri2 = dri2_dpy->gbm_dri->dri2;
   dri2_dpy->image = dri2_dpy->gbm_dri->image;
   dri2_dpy->driver_configs = dri2_dpy->gbm_dri->driver_configs;

   dri2_dpy->gbm_dri->lookup_image = dri2_lookup_egl_image;
   dri2_dpy->gbm_dri->lookup_user_data = disp;

   dri2_setup_screen(disp);

   for (i = 0; dri2_dpy->driver_configs[i]; i++)
      dri2_add_config(disp, dri2_dpy->driver_configs[i],
                      i + 1, 0, 0, NULL, NULL);

   drv->API.CreateImageKHR = dri2_drm_create_image_khr;

#ifdef HAVE_WAYLAND_PLATFORM
   disp->Extensions.WL_bind_wayland_display = EGL_TRUE;
#endif
   dri2_dpy->authenticate = dri2_drm_authenticate;

   /* we're supporting EGL 1.4 */
   disp->VersionMajor = 1;
   disp->VersionMinor = 4;

   return EGL_TRUE;
}