/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <unistd.h>

#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>

/* Includes and defines for framebuffer size retrieval */
#include <linux/fb.h>
#include <linux/vt.h>

#include <compat/strl.h>

#ifdef HAVE_CONFIG_H
#include "../../config.h"
#endif

#ifdef HAVE_EGL
#include "../common/egl_common.h"
#endif

#if defined(HAVE_OPENGL) || defined(HAVE_OPENGLES)
#include "../common/gl_common.h"
#endif

#include "../../frontend/frontend_driver.h"
#include "../../verbosity.h"
#include "../../configuration.h"

typedef struct
{
#ifdef HAVE_EGL
   egl_ctx_data_t egl;
#endif

   struct {
      unsigned short width;
      unsigned short height;
   } native_window;
   bool resize;
   unsigned width, height;
   float refresh_rate;
} mali_ctx_data_t;

static void gfx_ctx_mali_fbdev_destroy(void *data)
{
   int fd;
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;

   if (mali)
   {
#ifdef HAVE_EGL
       egl_destroy(&mali->egl);
#endif

       mali->resize       = false;
       free(mali);
   }

   /* Clear framebuffer and set cursor on again */
   fd = open("/dev/tty", O_RDWR);
   ioctl(fd, VT_ACTIVATE, 5);
   ioctl(fd, VT_ACTIVATE, 1);
   close(fd);

   system("setterm -cursor on");
}

static void gfx_ctx_mali_fbdev_get_video_size(void *data,
      unsigned *width, unsigned *height)
{
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;

   *width  = mali->width;
   *height = mali->height;
}

static void *gfx_ctx_mali_fbdev_init(void *video_driver)
{
#ifdef HAVE_EGL
   EGLint n;
   EGLint major, minor;
   EGLint format;
   static const EGLint attribs[] = {
      EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
      EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
      EGL_BLUE_SIZE, 8,
      EGL_GREEN_SIZE, 8,
      EGL_RED_SIZE, 8,
      EGL_ALPHA_SIZE, 8,
      EGL_NONE
   };
#endif

   mali_ctx_data_t *mali = (mali_ctx_data_t*)calloc(1, sizeof(*mali));

   if (!mali)
       return NULL;

#ifdef HAVE_EGL
   frontend_driver_install_signal_handler();
#endif

#ifdef HAVE_EGL
   if (!egl_init_context(&mali->egl, EGL_NONE, EGL_DEFAULT_DISPLAY,
            &major, &minor, &n, attribs, NULL))
      goto error;
#endif

   return mali;

error:
   egl_report_error();
   gfx_ctx_mali_fbdev_destroy(video_driver);
   return NULL;
}

static void gfx_ctx_mali_fbdev_check_window(void *data, bool *quit,
      bool *resize, unsigned *width, unsigned *height)
{
   unsigned new_width, new_height;

   gfx_ctx_mali_fbdev_get_video_size(data, &new_width, &new_height);

   if (new_width != *width || new_height != *height)
   {
      *width  = new_width;
      *height = new_height;
      *resize = true;
   }

   *quit   = (bool)frontend_driver_get_signal_handler_state();
}

static bool gfx_ctx_mali_fbdev_set_video_mode(void *data,
      unsigned width, unsigned height,
      bool fullscreen)
{
   struct fb_var_screeninfo vinfo;
   static const EGLint attribs[] = {
      EGL_CONTEXT_CLIENT_VERSION, 2, /* Use version 2, even for GLES3. */
      EGL_NONE
   };
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;
   int fd                = open("/dev/fb0", O_RDWR);

   if (ioctl(fd, FBIOGET_VSCREENINFO, &vinfo) < 0)
   {
      RARCH_ERR("Error obtaining framebuffer info.\n");
      goto error;
   }

   close(fd);
   fd = -1;

   width                      = vinfo.xres;
   height                     = vinfo.yres;

   mali->width                = width;
   mali->height               = height;

   mali->native_window.width  = vinfo.xres;
   mali->native_window.height = vinfo.yres;

   mali->refresh_rate = 1000000.0f / vinfo.pixclock * 1000000.0f /
         (vinfo.yres + vinfo.upper_margin + vinfo.lower_margin + vinfo.vsync_len) /
         (vinfo.xres + vinfo.left_margin  + vinfo.right_margin + vinfo.hsync_len);

#ifdef HAVE_EGL
   if (!egl_create_context(&mali->egl, attribs))
      goto error;
#endif

#ifdef HAVE_EGL
   if (!egl_create_surface(&mali->egl, &mali->native_window))
      goto error;
#endif

   return true;

error:
   if (fd >= 0)
      close(fd);
   egl_report_error();
   gfx_ctx_mali_fbdev_destroy(data);
   return false;
}

static void gfx_ctx_mali_fbdev_input_driver(void *data,
      const char *name,
      input_driver_t **input, void **input_data)
{
   *input      = NULL;
   *input_data = NULL;
}

static enum gfx_ctx_api gfx_ctx_mali_fbdev_get_api(void *data)
{
   return GFX_CTX_OPENGL_ES_API;
}

static bool gfx_ctx_mali_fbdev_bind_api(void *data,
      enum gfx_ctx_api api, unsigned major, unsigned minor)
{
   if (api == GFX_CTX_OPENGL_ES_API)
      return true;
   return false;
}

static bool gfx_ctx_mali_fbdev_has_focus(void *data) { return true; }

static bool gfx_ctx_mali_fbdev_suppress_screensaver(void *data, bool enable) { return false; }

static void gfx_ctx_mali_fbdev_set_swap_interval(void *data,
      int swap_interval)
{
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;

#ifdef HAVE_EGL
   egl_set_swap_interval(&mali->egl, swap_interval);
#endif
}

static void gfx_ctx_mali_fbdev_swap_buffers(void *data)
{
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;

#ifdef HAVE_EGL
   egl_swap_buffers(&mali->egl);
#endif
}

static void gfx_ctx_mali_fbdev_bind_hw_render(void *data, bool enable)
{
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;

#ifdef HAVE_EGL
   egl_bind_hw_render(&mali->egl, enable);
#endif
}

static uint32_t gfx_ctx_mali_fbdev_get_flags(void *data)
{
   uint32_t flags = 0;

   BIT32_SET(flags, GFX_CTX_FLAGS_SHADERS_GLSL);

   return flags;
}

static void gfx_ctx_mali_fbdev_set_flags(void *data, uint32_t flags) { }

static float gfx_ctx_mali_fbdev_get_refresh_rate(void *data)
{
   mali_ctx_data_t *mali = (mali_ctx_data_t*)data;

   return mali->refresh_rate;
}

const gfx_ctx_driver_t gfx_ctx_mali_fbdev = {
   gfx_ctx_mali_fbdev_init,
   gfx_ctx_mali_fbdev_destroy,
   gfx_ctx_mali_fbdev_get_api,
   gfx_ctx_mali_fbdev_bind_api,
   gfx_ctx_mali_fbdev_set_swap_interval,
   gfx_ctx_mali_fbdev_set_video_mode,
   gfx_ctx_mali_fbdev_get_video_size,
   gfx_ctx_mali_fbdev_get_refresh_rate,
   NULL, /* get_video_output_size */
   NULL, /* get_video_output_prev */
   NULL, /* get_video_output_next */
   NULL, /* get_metrics */
   NULL,
   NULL, /* update_title */
   gfx_ctx_mali_fbdev_check_window,
   NULL, /* set_resize */
   gfx_ctx_mali_fbdev_has_focus,
   gfx_ctx_mali_fbdev_suppress_screensaver,
   false, /* has_windowed */
   gfx_ctx_mali_fbdev_swap_buffers,
   gfx_ctx_mali_fbdev_input_driver,
#ifdef HAVE_EGL
   egl_get_proc_address,
#else
   NULL,
#endif
   NULL,
   NULL,
   NULL,
   "fbdev_mali",
   gfx_ctx_mali_fbdev_get_flags,
   gfx_ctx_mali_fbdev_set_flags,
   gfx_ctx_mali_fbdev_bind_hw_render,
   NULL,
   NULL
};
