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/* fb.c -- Simple frame buffer
   Copyright (C) 2001 Marko Mlinar, markom@opencores.org
 
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program 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 Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
#include <stdio.h>
#include "sim-config.h"
#include "abstract.h"
#include "fb.h"
 
static unsigned char buffer[FB_SIZEY * FB_SIZEX];
static unsigned long pal[256];
static int fb_pic;
static int fb_cycles;
 
/* Variable to screen buffer.  */
struct dev_memarea *buf_area;
static unsigned long fb_addr;
 
/* Write a register */
void fb_buf_write8 (unsigned long addr, unsigned long value)
{
  int a = addr - fb_addr;
  if (a < 0 || a >= FB_SIZEY * FB_SIZEX) {
    fprintf (stderr, "Write out of screen buffer (0x%08x)!\n", addr);
    cont_run = 0;
  } else buffer[a] = value;
}
 
/* Read a register */
unsigned long fb_buf_read8 (unsigned long addr)
{
  int a = (addr - fb_addr);
  if (a < 0 || a >= FB_SIZEY * FB_SIZEX) {
    fprintf (stderr, "Read out of screen buffer (0x%08x)!\n", addr);
    cont_run = 0;
    return 0;
  } else return buffer[a];
}
 
static void change_buf_addr (unsigned long addr)
{
  unsigned long size_mask = bit_mask (FB_SIZEX * FB_SIZEY);
  unsigned long addr_mask = ~size_mask;
  buf_area->addr_mask = addr_mask;
  buf_area->addr_compare = addr & addr_mask;
  fb_addr = addr;
}
 
/* Write a register */
void fb_write32 (unsigned long addr, unsigned long value)
{
  int a = (addr - config.fb.baseaddr);
  switch (a) {
    case FB_CTRL:    break;
    case FB_BUFADDR: change_buf_addr (value); break;
    default:
      a -= FB_PAL;
      a /= 4;
      if (a < 0 || a >= 256) {
        fprintf (stderr, "Write out of palette buffer (0x%08x)!\n", addr);
        cont_run = 0;
      } else pal[a] = value;
      break;
  } 
}
 
/* Read a register */
unsigned long fb_read32 (unsigned long addr)
{
  int a = (addr - config.fb.baseaddr);
  switch (a) {
    case FB_CTRL:    return 0; break;
    case FB_BUFADDR: return fb_addr; break;
    default:
      a -= FB_PAL;
      a /= 4;
      if (a < 0 || a >= 256) {
        fprintf (stderr, "Read out of palette buffer (0x%08x)!\n", addr);
        cont_run = 0;
        return 0;
      } else return pal[a];
  }
}
 
/* define these also for big endian */
#define CNV16(x) (x)
#define CNV32(x) (x)
 
/* Dumps a bmp file, based on current image */
static int fb_dump_image (char *filename)
{
  int sx = FB_SIZEX;
  int sy = FB_SIZEY;
  int i, x, y;
  FILE *fo;
 
  unsigned short int u16;
  unsigned long int u32;
 
  if (config.sim.verbose) printf ("Creating %s...", filename);
  fo = fopen (filename, "wb+");
  u16 = CNV16(19778); /* BM */
  if (!fwrite (&u16, 2, 1, fo)) return 1;
  u32 = CNV32(14 + 40 + sx * sy + 1024); /* size */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(0); /* reserved */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = 14 + 40 + 1024; /* offset */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
 
  u32 = CNV32(40); /* header size */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(sx); /* width */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(sy); /* height */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u16 = CNV16(1);  /* planes */
  if (!fwrite (&u16, 2, 1, fo)) return 1;
  u16 = CNV16(8);  /* bits */
  if (!fwrite (&u16, 2, 1, fo)) return 1;
  u32 = CNV32(0);  /* compression */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(x * y); /* image size */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(0);  /* x resolution */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(0);  /* y resolution */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(0);  /* ncolours = 0; should be generated */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(0);  /* important colours; all are important */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
 
  for (i = 0; i < 256; i++) {
    unsigned long val, d;
    d = pal[i];
    val = ((d >> 12) & 0xf) << 0 + 4;   /* Blue */
    val |= ((d >> 8) & 0xf) << 8 + 4;  /* Green */
    val |= ((d >> 4) & 0xf) << 16 + 4; /* Red */
    val = CNV32(pal[i]);
    if (!fwrite (&val, 4, 1, fo)) return 1;
  }
 
  if (config.sim.verbose) printf ("(%i,%i)", sx, sy);
  /* Data is stored upside down */
  for (y = sy - 1; y >= 0; y--) {
    int align = (4 - sx) % 4;
    int zero = CNV32(0);
    while (align < 0) align += 4;
    for (x = 0; x < sx; x++)
      fputc (buffer[y * sx + x], fo);
    if (align && !fwrite (&zero, align, 1, fo)) return 1;
  }
 
  if (config.sim.verbose) printf ("DONE\n");  
  fclose (fo);
  return 0;
}
 
/* Reset all VGAs */
void fb_reset ()
{
  int i;
 
  if (config.fb.enabled) {
    fb_pic = 0;
    fb_cycles = 0;
 
    for (i = 0; i < 256; i++)
      pal[i] = (i << 16) | (i << 8) | (i << 0);
 
    register_memoryarea(config.fb.bufaddr, FB_SIZEX * FB_SIZEY, 1, fb_buf_read8, fb_buf_write8);
    buf_area = cur_area;
 
    if (config.fb.baseaddr)
      register_memoryarea(config.fb.baseaddr, FB_PAL + 256*4, 4, fb_read32, fb_write32);
  }
}
 
/* Handles one VGA clock */
void fb_clock ()
{
  /* dump the image? */
  if (fb_cycles++ >= config.fb.refresh_rate) {
    char temp[STR_SIZE];
    sprintf (temp, "%s%04i.bmp", &config.fb.filename[0], fb_pic);
    fb_dump_image (temp);
    fb_cycles = 0;
    fb_pic++;
  }
}