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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"
#include "sched.h"
 
#define FB_WRAP (512*1024)
 
static unsigned long pal[256];
static int fb_ctrl = 0;
static int fb_pic = 0;
static int fb_in_refresh = 1;
static int fb_refresh_count = 0;
static unsigned long fb_addr = 0;
static unsigned long cam_addr = 0;
static int camerax = 0, cameray = 0, camera_pos = 0;
 
static void change_buf_addr (unsigned long addr)
{
  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:    fb_ctrl = value; break;
    case FB_BUFADDR: change_buf_addr (value); break;
    case FB_CAMBUFADDR: cam_addr = value; break;
    case FB_CAMPOSADDR: camera_pos = value;
		     camerax = value % FB_SIZEX;
		     cameray = value / FB_SIZEX;
		     break;
    default:
      a -= FB_PAL;
      a /= 4;
      if (a < 0 || a >= 256) {
        fprintf (stderr, "Write out of palette buffer (0x%08x)!\n", addr);
        runtime.sim.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 fb_ctrl & ~0xff000000| (fb_in_refresh ? 0x80000000 : 0) | ((unsigned long)(fb_refresh_count & 0x7f) << 24);
      break;
    case FB_BUFADDR: return fb_addr; break;
    case FB_CAMBUFADDR: return cam_addr; break;
    case FB_CAMPOSADDR: return camera_pos; break;
    default:
      a -= FB_PAL;
      a /= 4;
      if (a < 0 || a >= 256) {
        fprintf (stderr, "Read out of palette buffer (0x%08x)!\n", addr);
        runtime.sim.cont_run = 0;
        return 0;
      } else return pal[a];
  }
}
 
/* define these also for big endian */
#if __BIG_ENDIAN__
#define CNV32(x) (x) (\
     ((((x) >> 24) & 0xff) << 0)\
   | ((((x) >> 16) & 0xff) << 8)\
   | ((((x) >> 8) & 0xff) << 16)\
   | ((((x) >> 0) & 0xff) << 24))
#define CNV16(x) (x) (\
   | ((((x) >> 8) & 0xff) << 0)\
   | ((((x) >> 0) & 0xff) << 8))
#else
#define CNV16(x) (x)
#define CNV32(x) (x)
#endif
 
/* Dumps a bmp file, based on current image */
static int fb_dump_image8 (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(2835);  /* x resolution */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(2835);  /* 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];
#if 1
    val = ((d >> 0) & 0x1f) << 3;   /* Blue */
    val |= ((d >> 5) & 0x3f) << 10;  /* Green */
    val |= ((d >> 11) & 0x1f) << 19; /* Red */
#else 
    val = CNV32(pal[i]);
#endif
    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);
    int add;
    while (align < 0) align += 4;
    for (x = 0; x < sx; x++) {
      add = (fb_addr & ~(FB_WRAP - 1)) | ((fb_addr + y * sx + x) & (FB_WRAP - 1));
      fputc (evalsim_mem8 (add), fo);
    }
    if (align && !fwrite (&zero, align, 1, fo)) return 1;
  }
 
  if (config.sim.verbose) printf ("DONE\n");  
  fclose (fo);
  return 0;
}
 
/* Dumps a bmp file, based on current image */
static int fb_dump_image24 (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 * 3); /* size */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(0); /* reserved */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = 14 + 40; /* 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(24);  /* 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 * 3); /* image size */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(2835);  /* x resolution */
  if (!fwrite (&u32, 4, 1, fo)) return 1;
  u32 = CNV32(2835);  /* 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;
 
  if (config.sim.verbose) printf ("(%i,%i)", sx, sy);
  /* Data is stored upside down */
  for (y = sy - 1; y >= 0; y--) {
    unsigned char line[FB_SIZEX][3];
    for (x = 0; x < sx; x++) 
      if (y >= cameray && x >= camerax && y < cameray + CAM_SIZEY && x < camerax + CAM_SIZEX) {
        int add = (cam_addr + (x - camerax + (y - cameray) * CAM_SIZEX) * 2) ^ 2;
	unsigned short d = evalsim_mem16 (add); 
        line[x][0] = ((d >> 0) & 0x1f) << 3;  /* Blue */
        line[x][1] = ((d >> 5) & 0x3f) << 2;  /* Green */
        line[x][2] = ((d >> 11) & 0x1f) << 3; /* Red */
      } else {
        int add = (fb_addr & ~(FB_WRAP - 1)) | ((fb_addr + y * sx + x) & (FB_WRAP - 1));
        unsigned short d = pal[evalsim_mem8 (add)];
        line[x][0] = ((d >> 0) & 0x1f) << 3;  /* Blue */
        line[x][1] = ((d >> 5) & 0x3f) << 2;  /* Green */
        line[x][2] = ((d >> 11) & 0x1f) << 3; /* Red */
      }
    if(!fwrite (line, sizeof(line), 1, fo)) return 1;
  }
 
  if (config.sim.verbose) printf ("DONE\n");  
  fclose (fo);
  return 0;
}
 
void fb_job (int param)
{
  if (param) {
    /* dump the image? */
    if (fb_ctrl & 1) {
      char temp[STR_SIZE];
      sprintf (temp, "%s%04i.bmp", &config.fb.filename[0], fb_pic);
      if (fb_ctrl & 2) fb_dump_image24 (temp);
      else fb_dump_image8 (temp);
      fb_pic++;
    }
    SCHED_ADD(fb_job, 0, runtime.sim.cycles + config.fb.refresh_rate - config.fb.refresh_rate / REFRESH_DIVIDER);
    fb_in_refresh = 0;
  } else {
    fb_refresh_count++;
    SCHED_ADD(fb_job, 1, runtime.sim.cycles + config.fb.refresh_rate / REFRESH_DIVIDER); 
 
  }
}
 
/* Reset all VGAs */
void fb_reset ()
{
  int i;
 
  if (config.fb.enabled) {
    fb_pic = 0;
    fb_addr = 0;
    fb_ctrl = 0;
 
    for (i = 0; i < 256; i++)
      pal[i] = (i << 16) | (i << 8) | (i << 0);
 
    if (config.fb.baseaddr)
      register_memoryarea(config.fb.baseaddr, FB_PAL + 256*4, 4, fb_read32, fb_write32);
    SCHED_ADD(fb_job, 0, runtime.sim.cycles + config.fb.refresh_rate);
  }
}