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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 "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 */
static struct {
  int pics;
  unsigned long ctrl, stat, htim, vtim;
  int vbindex;
  unsigned long vbar[2];
  unsigned hlen, vlen;
  int pindex;
  unsigned long palette[2][256];
} vga[MAX_VGAS];
 
 
/* Write a register */
void vga_write32(unsigned long addr, unsigned long value)
{
  int i, found = -1;
 
  /* Find which controller this is */
  for (i = 0; i < config.nvgas; i++ ) {
    if ((addr >= config.vgas[i].baseaddr) && (addr < config.vgas[i].baseaddr + VGA_ADDR_SPACE)) {
      found = i;
      break;
    }
  }
 
  if (found < 0) {
    fprintf( stderr, "vga_write32( 0x%08lX ): Out of range\n", addr);
    runtime.sim.cont_run = 0;
    return;
  }
 
  addr -= config.vgas[found].baseaddr;
 
  switch (addr) {
    case VGA_CTRL:  vga[found].ctrl = value; break;
    case VGA_STAT:  vga[found].stat = value; break;
    case VGA_HTIM:  vga[found].htim = value; break;
    case VGA_VTIM:  vga[found].vtim = value; break;
    case VGA_HVLEN: vga[found].hlen = (value >> 16) + 2; vga[found].hlen = (value & 0xffff) + 2; break;
    case VGA_VBARA: vga[found].vbar[0] = value; break;
    case VGA_VBARB: vga[found].vbar[1] = value; break;
    default:
      if (addr >= VGA_CLUTA && addr < VGA_CLUTB) {
        vga[found].palette[0][addr - VGA_CLUTA] = value & 0x00ffffff;
      } else if (addr >= VGA_CLUTB) {
        vga[found].palette[1][addr - VGA_CLUTB] = value & 0x00ffffff;
      } else {
        fprintf( stderr, "vga_write32( 0x%08lX, 0x%08lX ): Out of range\n", addr + config.vgas[found].baseaddr, value);
        runtime.sim.cont_run = 0;
        return;
      }
      break;
  }
}
 
/* Read a register */
unsigned long vga_read32(unsigned long addr)
{
  int i, found = -1;
 
  /* Find which controller this is */
  for (i = 0; i < config.nvgas; i++ ) {
    if ((addr >= config.vgas[i].baseaddr) && (addr < config.vgas[i].baseaddr + VGA_ADDR_SPACE)) {
      found = i;
      break;
    }
  }
 
  if (found < 0) {
    fprintf( stderr, "vga_read32( 0x%08lX ): Out of range\n", addr);
    runtime.sim.cont_run = 0;
    return 0;
  }
 
  addr -= config.vgas[found].baseaddr;
 
  switch (addr) {
    case VGA_CTRL:  return vga[found].ctrl;
    case VGA_STAT:  return vga[found].stat;
    case VGA_HTIM:  return vga[found].htim;
    case VGA_VTIM:  return vga[found].vtim;
    case VGA_HVLEN: return ((vga[found].hlen - 2) << 16) | (vga[found].vlen - 2);
    case VGA_VBARA: return vga[found].vbar[0];
    case VGA_VBARB: return vga[found].vbar[1];
    default:
      if (addr >= VGA_CLUTA && addr < VGA_CLUTB) {
        return vga[found].palette[0][addr - VGA_CLUTA];
      } else if (addr >= VGA_CLUTB) {
        return vga[found].palette[1][addr - VGA_CLUTB];
      } else {
        fprintf( stderr, "vga_read32( 0x%08lX ): Out of range\n", addr);
        runtime.sim.cont_run = 0;
        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, int v)
{
  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, int v)
{
  unsigned long addr = config.vgas[v].baseaddr;
  int sx = vga[v].hlen;
  int sy = vga[v].vlen;
  int i, x, y;
  int pc = vga[v].ctrl & VGA_CTRL_PC;
  int rbpp = vga[v].ctrl & VGA_CTRL_CD;
  int bpp = rbpp >> 8;
 
  BMP_HEADER bh;
  INFOHEADER ih;
  FILE *fo;
 
  if (!sx || !sy) return;
 
  /* 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[v].palette[vga[v].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 = evalsim_mem32 (vga[v].vbar[vga[v].vbindex] + (y * sx + x) * (bpp + 1));
      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 (int param)
{
  /* dump the image? */
  char temp[STR_SIZE];
  sprintf (temp, "%s%04i.bmp", config.vgas[param].filename, vga[param].pics++);
  vga_dump_image (temp, param);
 
  SCHED_ADD(vga_job, param, runtime.sim.cycles + config.vgas[param].refresh_rate);
}
 
/* Reset all VGAs */
void vga_reset ()
{
  int i, j;
  for (i = 0; i < config.nvgas; i++) {
 
    /* Init palette */
    for (j = 0; j < 256; j++)
      vga[i].palette[0][j] = vga[i].palette[1][j] = 0;
 
    vga[i].ctrl = vga[i].stat = vga[i].htim = vga[i].vtim = 0;
    vga[i].hlen = vga[i].vlen = 0;
    vga[i].vbar[0] = vga[i].vbar[1] = 0;
 
    /* Init screen dumping machine */
    vga[i].pics = 0;
 
    vga[i].pindex = 0;
    vga[i].vbindex = 0;
 
    if (config.vgas[i].baseaddr)
      register_memoryarea(config.vgas[i].baseaddr, VGA_ADDR_SPACE, 4, 0, vga_read32, vga_write32);
    SCHED_ADD(vga_job, i, runtime.sim.cycles + config.vgas[i].refresh_rate);
  }
}