SDL_fbvideo.h

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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2012 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _SDL_fbvideo_h
#define _SDL_fbvideo_h

#include <sys/types.h>
#include <termios.h>
#include <linux/fb.h>

#include "SDL_mouse.h"
#include "SDL_mutex.h"
#include "../SDL_sysvideo.h"
#if SDL_INPUT_TSLIB
#include "tslib.h"
#endif

/* Hidden "this" pointer for the video functions */
#define _THIS SDL_VideoDevice *this

typedef void FB_bitBlit(
    Uint8 *src_pos,
    int src_right_delta,  /* pixels, not bytes */
    int src_down_delta,   /* pixels, not bytes */
    Uint8 *dst_pos,
    int dst_linebytes,
    int width,
    int height);

/* This is the structure we use to keep track of video memory */
typedef struct vidmem_bucket {
  struct vidmem_bucket *prev;
  int used;
  int dirty;
  char *base;
  unsigned int size;
  struct vidmem_bucket *next;
} vidmem_bucket;

/* Private display data */
struct SDL_PrivateVideoData {
  int console_fd;
  struct fb_var_screeninfo cache_vinfo;
  struct fb_var_screeninfo saved_vinfo;
  int saved_cmaplen;
  __u16 *saved_cmap;

  int current_vt;
  int saved_vt;
  int keyboard_fd;
  int saved_kbd_mode;
  struct termios saved_kbd_termios;

  int mouse_fd;
#if SDL_INPUT_TSLIB
  struct tsdev *ts_dev;
#endif

  char *mapped_mem;
  char *shadow_mem;
  int mapped_memlen;
  int mapped_offset;
  char *mapped_io;
  long mapped_iolen;
  int flip_page;
  char *flip_address[2];
  int rotate;
  int shadow_fb;        /* Tells whether a shadow is being used. */
  FB_bitBlit *blitFunc;
  int physlinebytes;      /* Length of a line in bytes in physical fb */

#define NUM_MODELISTS 4   /* 8, 16, 24, and 32 bits-per-pixel */
  int SDL_nummodes[NUM_MODELISTS];
  SDL_Rect **SDL_modelist[NUM_MODELISTS];

  vidmem_bucket surfaces;
  int surfaces_memtotal;
  int surfaces_memleft;

  SDL_mutex *hw_lock;
  int switched_away;
  struct fb_var_screeninfo screen_vinfo;
  Uint32 screen_arealen;
  Uint8 *screen_contents;
  __u16  screen_palette[3*256];

  void (*wait_vbl)(_THIS);
  void (*wait_idle)(_THIS);
};
/* Old variable names */
#define console_fd    (this->hidden->console_fd)
#define current_vt    (this->hidden->current_vt)
#define saved_vt    (this->hidden->saved_vt)
#define keyboard_fd   (this->hidden->keyboard_fd)
#define saved_kbd_mode    (this->hidden->saved_kbd_mode)
#define saved_kbd_termios (this->hidden->saved_kbd_termios)
#define mouse_fd    (this->hidden->mouse_fd)
#if SDL_INPUT_TSLIB
#define ts_dev      (this->hidden->ts_dev)
#endif
#define cache_vinfo   (this->hidden->cache_vinfo)
#define saved_vinfo   (this->hidden->saved_vinfo)
#define saved_cmaplen   (this->hidden->saved_cmaplen)
#define saved_cmap    (this->hidden->saved_cmap)
#define mapped_mem    (this->hidden->mapped_mem)
#define shadow_mem    (this->hidden->shadow_mem)
#define mapped_memlen   (this->hidden->mapped_memlen)
#define mapped_offset   (this->hidden->mapped_offset)
#define mapped_io   (this->hidden->mapped_io)
#define mapped_iolen    (this->hidden->mapped_iolen)
#define flip_page   (this->hidden->flip_page)
#define flip_address    (this->hidden->flip_address)
#define rotate      (this->hidden->rotate)
#define shadow_fb   (this->hidden->shadow_fb)
#define blitFunc    (this->hidden->blitFunc)
#define physlinebytes   (this->hidden->physlinebytes)
#define SDL_nummodes    (this->hidden->SDL_nummodes)
#define SDL_modelist    (this->hidden->SDL_modelist)
#define surfaces    (this->hidden->surfaces)
#define surfaces_memtotal (this->hidden->surfaces_memtotal)
#define surfaces_memleft  (this->hidden->surfaces_memleft)
#define hw_lock     (this->hidden->hw_lock)
#define switched_away   (this->hidden->switched_away)
#define screen_vinfo    (this->hidden->screen_vinfo)
#define screen_arealen    (this->hidden->screen_arealen)
#define screen_contents   (this->hidden->screen_contents)
#define screen_palette    (this->hidden->screen_palette)
#define wait_vbl    (this->hidden->wait_vbl)
#define wait_idle   (this->hidden->wait_idle)

/* Accelerator types that are supported by the driver, but are not
   necessarily in the kernel headers on the system we compile on.
*/
#ifndef FB_ACCEL_MATROX_MGAG400
#define FB_ACCEL_MATROX_MGAG400 26  /* Matrox G400      */
#endif
#ifndef FB_ACCEL_3DFX_BANSHEE
#define FB_ACCEL_3DFX_BANSHEE 31  /* 3Dfx Banshee     */
#endif

/* These functions are defined in SDL_fbvideo.c */
extern void FB_SavePaletteTo(_THIS, int palette_len, __u16 *area);
extern void FB_RestorePaletteFrom(_THIS, int palette_len, __u16 *area);

/* These are utility functions for working with video surfaces */

static __inline__ void FB_AddBusySurface(SDL_Surface *surface)
{
  ((vidmem_bucket *)surface->hwdata)->dirty = 1;
}

static __inline__ int FB_IsSurfaceBusy(SDL_Surface *surface)
{
  return ((vidmem_bucket *)surface->hwdata)->dirty;
}

static __inline__ void FB_WaitBusySurfaces(_THIS)
{
  vidmem_bucket *bucket;

  /* Wait for graphic operations to complete */
  wait_idle(this);

  /* Clear all surface dirty bits */
  for ( bucket=&surfaces; bucket; bucket=bucket->next ) {
    bucket->dirty = 0;
  }
}

static __inline__ void FB_dst_to_xy(_THIS, SDL_Surface *dst, int *x, int *y)
{
  *x = (long)((char *)dst->pixels - mapped_mem)%this->screen->pitch;
  *y = (long)((char *)dst->pixels - mapped_mem)/this->screen->pitch;
  if ( dst == this->screen ) {
    *x += this->offset_x;
    *y += this->offset_y;
  }
}

#endif /* _SDL_fbvideo_h */