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/* vga.c -- Definition of types and structures for VGA/LCD
   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 <string.h>
 
#include "config.h"
 
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include "port.h"
#include "arch.h"
#include "sim-config.h"
#include "vga.h"
#include "abstract.h"
#include "sched.h"
 
/* When this counter reaches config.vgas[].refresh_rate, a screenshot is taken and outputted */
struct vga_state {
  int enabled;
  int pics;
  unsigned long ctrl, stat, htim, vtim;
  int vbindex;
  unsigned long vbar[2];
  unsigned hlen, vlen;
  int pindex;
  unsigned long palette[2][256];
  oraddr_t baseaddr;
  int refresh_rate;
  int irq;
  char *filename;
};
 
 
/* Write a register */
void vga_write32(oraddr_t addr, uint32_t value, void *dat)
{
  struct vga_state *vga = dat;
 
  switch (addr) {
    case VGA_CTRL:  vga->ctrl = value; break;
    case VGA_STAT:  vga->stat = value; break;
    case VGA_HTIM:  vga->htim = value; break;
    case VGA_VTIM:  vga->vtim = value; break;
    case VGA_HVLEN: vga->hlen = (value >> 16) + 2; vga->hlen = (value & 0xffff) + 2; break;
    case VGA_VBARA: vga->vbar[0] = value; break;
    case VGA_VBARB: vga->vbar[1] = value; break;
    default:
      if (addr >= VGA_CLUTA && addr < VGA_CLUTB) {
        vga->palette[0][addr - VGA_CLUTA] = value & 0x00ffffff;
      } else if (addr >= VGA_CLUTB) {
        vga->palette[1][addr - VGA_CLUTB] = value & 0x00ffffff;
      } else {
        fprintf( stderr, "vga_write32( 0x%"PRIxADDR", 0x%08"PRIx32" ): Out of range\n", addr + vga->baseaddr, value);
        return;
      }
      break;
  }
}
 
/* Read a register */
uint32_t vga_read32(oraddr_t addr, void *dat)
{
  struct vga_state *vga = dat;
 
  switch (addr) {
    case VGA_CTRL:  return vga->ctrl;
    case VGA_STAT:  return vga->stat;
    case VGA_HTIM:  return vga->htim;
    case VGA_VTIM:  return vga->vtim;
    case VGA_HVLEN: return ((vga->hlen - 2) << 16) | (vga->vlen - 2);
    case VGA_VBARA: return vga->vbar[0];
    case VGA_VBARB: return vga->vbar[1];
    default:
      if (addr >= VGA_CLUTA && addr < VGA_CLUTB) {
        return vga->palette[0][addr - VGA_CLUTA];
      } else if (addr >= VGA_CLUTB) {
        return vga->palette[1][addr - VGA_CLUTB];
      } else {
        fprintf( stderr, "vga_read32( 0x%"PRIxADDR" ): Out of range\n", addr);
        return 0;
      }
      break;
  }
  return 0;
}
 
/* This code will only work on little endian machines */
#ifdef __BIG_ENDIAN__
#warning Image dump not supported on big endian machines 
 
static int vga_dump_image (char *filename, struct vga_start *vga)
{
  return 1;
}
 
#else 
 
typedef struct {
   unsigned short int type;                 /* Magic identifier            */
   unsigned int size;                       /* File size in bytes          */
   unsigned short int reserved1, reserved2;
   unsigned int offset;                     /* Offset to image data, bytes */
} BMP_HEADER;
 
typedef struct {
   unsigned int size;               /* Header size in bytes      */
   int width,height;                /* Width and height of image */
   unsigned short int planes;       /* Number of colour planes   */
   unsigned short int bits;         /* Bits per pixel            */
   unsigned int compression;        /* Compression type          */
   unsigned int imagesize;          /* Image size in bytes       */
   int xresolution,yresolution;     /* Pixels per meter          */
   unsigned int ncolours;           /* Number of colours         */
   unsigned int importantcolours;   /* Important colours         */
} INFOHEADER;
 
 
/* Dumps a bmp file, based on current image */
static int vga_dump_image (char *filename, struct vga_state *vga)
{
  int sx = vga->hlen;
  int sy = vga->vlen;
  int i, x, y;
  int pc = vga->ctrl & VGA_CTRL_PC;
  int rbpp = vga->ctrl & VGA_CTRL_CD;
  int bpp = rbpp >> 8;
 
  BMP_HEADER bh;
  INFOHEADER ih;
  FILE *fo;
 
  if (!sx || !sy) return 1;
 
  /* 16bpp and 32 bpp will be converted to 24bpp */
  if (bpp == 1 || bpp == 3) bpp = 2;
 
  bh.type = 19778; /* BM */
  bh.size = sizeof (BMP_HEADER) + sizeof (INFOHEADER) + sx * sy * (bpp * 4 + 4) + (pc ? 1024 : 0);
  bh.reserved1 = bh.reserved2 = 0;
  bh.offset = sizeof (BMP_HEADER) + sizeof (INFOHEADER) + (pc ? 1024 : 0);
 
  ih.size = sizeof (INFOHEADER);
  ih.width = sx; ih.height = sy;
  ih.planes = 1; ih.bits = bpp * 4 + 4;
  ih.compression = 0; ih.imagesize = x * y * (bpp * 4 + 4);
  ih.xresolution = ih.yresolution = 0;
  ih.ncolours = 0; /* should be generated */
  ih.importantcolours = 0; /* all are important */
 
  fo = fopen (filename, "wb+");
  if (!fwrite (&bh, sizeof (BMP_HEADER), 1, fo)) return 1;
  if (!fwrite (&ih, sizeof (INFOHEADER), 1, fo)) return 1;
 
  if (pc) { /* Write palette? */
    for (i = 0; i < 256; i++) {
      unsigned long val, d;
      d = vga->palette[vga->pindex][i];
      val = (d >> 0) & 0xff;   /* Blue */
      val |= (d >> 8) & 0xff;  /* Green */
      val |= (d >> 16) & 0xff; /* Red */
      if (!fwrite (&val, sizeof (val), 1, fo)) return 1;
    }
  }
 
  /* Data is stored upside down */
  for (y = sy - 1; y >= 0; y--) {
    int align = 4 - ((bpp + 1) * sx) % 4;
    int zero = 0;
    for (x = 0; x < sx; x++) {
      unsigned long pixel = eval_direct32 (vga->vbar[vga->vbindex] + (y * sx + x) * (bpp + 1), 0, 0);
      if (!fwrite (&pixel, sizeof (pixel), 1, fo)) return 1;
    }
    if (!fwrite (&zero, align, 1, fo)) return 1;
  }
 
  fclose (fo);
  return 0;
}
#endif /* !__BIG_ENDIAN__ */
 
void vga_job (void *dat)
{
  struct vga_state *vga = dat;
  /* dump the image? */
  char temp[STR_SIZE];
  sprintf (temp, "%s%04i.bmp", vga->filename, vga->pics++);
  vga_dump_image (temp, vga);
 
  SCHED_ADD(vga_job, dat, vga->refresh_rate);
}
 
/* Reset all VGAs */
void vga_reset (void *dat)
{
  struct vga_state *vga = dat;
 
  int i;
 
  /* Init palette */
  for (i = 0; i < 256; i++)
    vga->palette[0][i] = vga->palette[1][i] = 0;
 
  vga->ctrl = vga->stat = vga->htim = vga->vtim = 0;
  vga->hlen = vga->vlen = 0;
  vga->vbar[0] = vga->vbar[1] = 0;
 
  /* Init screen dumping machine */
  vga->pics = 0;
 
  vga->pindex = 0;
  vga->vbindex = 0;
 
  SCHED_ADD(vga_job, dat, vga->refresh_rate);
}
 
/*----------------------------------------------------[ VGA Configuration ]---*/
void vga_baseaddr(union param_val val, void *dat)
{
  struct vga_state *vga = dat;
  vga->baseaddr = val.addr_val;
}
 
void vga_irq(union param_val val, void *dat)
{
  struct vga_state *vga = dat;
  vga->irq = val.int_val;
}
 
void vga_refresh_rate(union param_val val, void *dat)
{
  struct vga_state *vga = dat;
  vga->refresh_rate = val.int_val;
}
 
void vga_filename(union param_val val, void *dat)
{
  struct vga_state *vga = dat;
  if(!(vga->filename = strdup (val.str_val)));
}
 
void vga_enabled(union param_val val, void *dat)
{
  struct vga_state *vga = dat;
  vga->enabled = val.int_val;
}
 
void *vga_sec_start(void)
{
  struct vga_state *new = malloc(sizeof(struct vga_state));
 
  if(!new) {
    fprintf(stderr, "Peripheral VGA: Run out of memory\n");
    exit(-1);
  }
 
  new->baseaddr = 0;
  new->enabled = 1;
 
  return new;
}
 
void vga_sec_end(void *dat)
{
  struct vga_state *vga = dat;
  struct mem_ops ops;
 
  if(!vga->enabled) {
    free(dat);
    return;
  }
 
  memset(&ops, 0, sizeof(struct mem_ops));
 
  ops.readfunc32 = vga_read32;
  ops.writefunc32 = vga_write32;
  ops.write_dat32 = dat;
  ops.read_dat32 = dat;
 
  /* FIXME: Correct delay? */
  ops.delayr = 2;
  ops.delayw = 2;
 
  reg_mem_area(vga->baseaddr, VGA_ADDR_SPACE, 0, &ops);
 
  reg_sim_reset(vga_reset, dat);
}
 
void reg_vga_sec(void)
{
  struct config_section *sec = reg_config_sec("vga", vga_sec_start, vga_sec_end);
 
  reg_config_param(sec, "baseaddr", paramt_addr, vga_baseaddr);
  reg_config_param(sec, "enabled", paramt_int, vga_enabled);
  reg_config_param(sec, "irq", paramt_int, vga_irq);
  reg_config_param(sec, "refresh_rate", paramt_int, vga_refresh_rate);
  reg_config_param(sec, "filename", paramt_str, vga_filename);
}