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vga.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001-2004 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/simon/vga.cpp,v 1.117 2004/07/27 07:21:28 kirben Exp $
 *
 */

// Video script opcodes for Simon1/Simon2
#include "stdafx.h"
#include "simon/simon.h"
#include "simon/intern.h"
#include "simon/vga.h"

namespace Simon {

typedef void (SimonEngine::*VgaOpcodeProc) ();
static uint16 vc_get_out_of_code = 0;

// Opcode tables
static const VgaOpcodeProc vga_opcode_table[] = {
      NULL,
      &SimonEngine::vc_1_dummy_op,
      &SimonEngine::vc_2_call,
      &SimonEngine::vc_3_new_sprite,
      &SimonEngine::vc_4_dummy_op,
      &SimonEngine::vc_5_skip_if_neq,
      &SimonEngine::vc_6_skip_ifn_sib_with_a,
      &SimonEngine::vc_7_skip_if_sib_with_a,
      &SimonEngine::vc_8_skip_if_parent_is,
      &SimonEngine::vc_9_skip_if_unk3_is,
      &SimonEngine::vc_10_draw,
      &SimonEngine::vc_11_clear_pathfind_array,
      &SimonEngine::vc_12_delay,
      &SimonEngine::vc_13_set_sprite_offset_x,
      &SimonEngine::vc_14_set_sprite_offset_y,
      &SimonEngine::vc_15_wakeup_id,
      &SimonEngine::vc_16_sleep_on_id,
      &SimonEngine::vc_17_set_pathfind_item,
      &SimonEngine::vc_18_jump_rel,
      &SimonEngine::vc_19_chain_to_script,
      &SimonEngine::vc_20_set_code_word,
      &SimonEngine::vc_21_jump_if_code_word,
      &SimonEngine::vc_22_set_sprite_palette,
      &SimonEngine::vc_23_set_sprite_priority,
      &SimonEngine::vc_24_set_sprite_xy,
      &SimonEngine::vc_25_halt_sprite,
      &SimonEngine::vc_26_set_window,
      &SimonEngine::vc_27_reset,
      &SimonEngine::vc_28_dummy_op,
      &SimonEngine::vc_29_stop_all_sounds,
      &SimonEngine::vc_30_set_base_delay,
      &SimonEngine::vc_31_set_palette_mode,
      &SimonEngine::vc_32_copy_var,
      &SimonEngine::vc_33_force_unlock,
      &SimonEngine::vc_34_force_lock,
      &SimonEngine::vc_35,
      &SimonEngine::vc_36_saveload_thing,
      &SimonEngine::vc_37_set_sprite_offset_y,
      &SimonEngine::vc_38_skip_if_var_zero,
      &SimonEngine::vc_39_set_var,
      &SimonEngine::vc_40_var_add,
      &SimonEngine::vc_41_var_sub,
      &SimonEngine::vc_42_delay_if_not_eq,
      &SimonEngine::vc_43_skip_if_bit_clear,
      &SimonEngine::vc_44_skip_if_bit_set,
      &SimonEngine::vc_45_set_sprite_x,
      &SimonEngine::vc_46_set_sprite_y,
      &SimonEngine::vc_47_add_var_f,
      &SimonEngine::vc_48,
      &SimonEngine::vc_49_set_bit,
      &SimonEngine::vc_50_clear_bit,
      &SimonEngine::vc_51_clear_hitarea_bit_0x40,
      &SimonEngine::vc_52_play_sound,
      &SimonEngine::vc_53_no_op,
      &SimonEngine::vc_54_no_op,
      &SimonEngine::vc_55_offset_hit_area,
      &SimonEngine::vc_56_delay,
      &SimonEngine::vc_57_no_op,
      &SimonEngine::vc_58,
      &SimonEngine::vc_59,
      &SimonEngine::vc_60_kill_sprite,
      &SimonEngine::vc_61_sprite_change,
      &SimonEngine::vc_62_palette_thing,
      &SimonEngine::vc_63_palette_thing_2,
      &SimonEngine::vc_64_skip_if_no_speech,
      &SimonEngine::vc_65_palette_thing_3,
      &SimonEngine::vc_66_skip_if_nz,
      &SimonEngine::vc_67_skip_if_ge,
      &SimonEngine::vc_68_skip_if_le,
      &SimonEngine::vc_69_play_track,
      &SimonEngine::vc_70_queue_music,
      &SimonEngine::vc_71_check_music_queue,
      &SimonEngine::vc_72_play_track_2,
      &SimonEngine::vc_73_set_op189_flag,
      &SimonEngine::vc_74_clear_op189_flag,
};

// Script parser
void SimonEngine::run_vga_script() {
      for (;;) {
            uint opcode;

            if (_continous_vgascript) {
                  if (_vc_ptr != (byte *)&vc_get_out_of_code) {
                        fprintf(_dump_file, "%.5d %.5X: %5d %4d ", _vga_tick_counter, _vc_ptr - _cur_vga_file_1, _vga_cur_sprite_id, _vga_cur_file_id);
                        dump_video_script(_vc_ptr, true);
                  }
            }

            if (!(_game & GF_SIMON2)) {
                  opcode = READ_BE_UINT16(_vc_ptr);
                  _vc_ptr += 2;
            } else {
                  opcode = *_vc_ptr++;
            }

            if (opcode >= NUM_VIDEO_OP_CODES)
                  error("Invalid VGA opcode '%d' encountered", opcode);

            if (opcode == 0)
                  return;

            (this->*vga_opcode_table[opcode]) ();
      }
}

int SimonEngine::vc_read_var_or_word() {
      int16 var = vc_read_next_word();
      if (var < 0)
            var = vc_read_var(-var);
      return var;
}

uint SimonEngine::vc_read_next_word() {
      uint a = READ_BE_UINT16(_vc_ptr);
      _vc_ptr += 2;
      return a;
}

uint SimonEngine::vc_read_next_byte() {
      return *_vc_ptr++;
}

void SimonEngine::vc_skip_next_instruction() {
      static const byte opcode_param_len_simon1[] = {
            0, 6, 2, 10, 6, 4, 2, 2,
            4, 4, 10, 0, 2, 2, 2, 2,
            2, 0, 2, 0, 4, 2, 4, 2,
            8, 0, 10, 0, 8, 0, 2, 2,
            4, 0, 0, 4, 4, 2, 2, 4,
            4, 4, 4, 2, 2, 2, 2, 4,
            0, 2, 2, 2, 2, 4, 6, 6,
            0, 0, 0, 0, 2, 6, 0, 0,
      };

      static const byte opcode_param_len_simon2[] = {
            0, 6, 2, 12, 6, 4, 2, 2,
            4, 4, 9, 0, 1, 2, 2, 2,
            2, 0, 2, 0, 4, 2, 4, 2,
            7, 0, 10, 0, 8, 0, 2, 2,
            4, 0, 0, 4, 4, 2, 2, 4,
            4, 4, 4, 2, 2, 2, 2, 4,
            0, 2, 2, 2, 2, 4, 6, 6,
            2, 0, 6, 6, 4, 6, 0, 0,
            0, 0, 4, 4, 4, 4, 4, 0,
            4, 2, 2
      };

      if (_game & GF_SIMON2) {
            uint opcode = vc_read_next_byte();
            _vc_ptr += opcode_param_len_simon2[opcode];
      } else {
            uint opcode = vc_read_next_word();
            _vc_ptr += opcode_param_len_simon1[opcode];
      }

      if (_continous_vgascript)
            fprintf(_dump_file, "; skipped\n");
}

void SimonEngine::o_read_vgares_23() {
      // Simon1 Only
      if (_vga_res_328_loaded == true) {
            _vga_res_328_loaded = false;
            _lock_word |= 0x4000;
            read_vga_from_datfile_1(23);
            _lock_word &= ~0x4000;
      }
}

void SimonEngine::o_read_vgares_328() {
      // Simon1 Only
      if (_vga_res_328_loaded == false) {
            _vga_res_328_loaded = true;
            _lock_word |= 0x4000;
            read_vga_from_datfile_1(328);
            _lock_word &= ~0x4000;
      }
}

// VGA Script commands
void SimonEngine::vc_1_dummy_op() {
      /* dummy opcode */
      _vc_ptr += 6;
}

void SimonEngine::vc_2_call() {
      VgaPointersEntry *vpe;
      uint num;
      uint res;
      byte *old_file_1, *old_file_2;
      byte *b, *bb, *vc_ptr_org;

      num = vc_read_var_or_word();

      old_file_1 = _cur_vga_file_1;
      old_file_2 = _cur_vga_file_2;

      for (;;) {
            res = num / 100;
            vpe = &_vga_buffer_pointers[res];

            _cur_vga_file_1 = vpe->vgaFile1;
            _cur_vga_file_2 = vpe->vgaFile2;
            if (vpe->vgaFile1 != NULL)
                  break;
            if (_vga_cur_file_2 != res)
                  _video_var_7 = _vga_cur_file_2;

            ensureVgaResLoaded(res);
            _video_var_7 = 0xFFFF;
      }


      bb = _cur_vga_file_1;
      b = bb + READ_BE_UINT16(&((VgaFile1Header *) bb)->hdr2_start);
      b = bb + READ_BE_UINT16(&((VgaFile1Header2 *) b)->unk2_offs);

      while (READ_BE_UINT16(&((VgaFile1Struct0x8 *) b)->id) != num)
            b += sizeof(VgaFile1Struct0x8);

      vc_ptr_org = _vc_ptr;

      _vc_ptr = _cur_vga_file_1 + READ_BE_UINT16(&((VgaFile1Struct0x8 *) b)->script_offs);

      //dump_vga_script(_vc_ptr, res, num);
      run_vga_script();

      _cur_vga_file_1 = old_file_1;
      _cur_vga_file_2 = old_file_2;

      _vc_ptr = vc_ptr_org;
}

void SimonEngine::vc_3_new_sprite() {
      uint16 a, f, base_color, x, y, vga_sprite_id;
      uint16 res;
      VgaSprite *vsp;
      VgaPointersEntry *vpe;
      byte *p, *pp;
      byte *old_file_1;

      a = vc_read_next_word();                  /* 0 */

      if (_game & GF_SIMON2) {
            f = vc_read_next_word();            /* 0 */
            vga_sprite_id = vc_read_next_word();      /* 2 */
      } else {
            vga_sprite_id = vc_read_next_word();      /* 2 */
            f = vga_sprite_id / 100;
      }

      x = vc_read_next_word();                  /* 4 */
      y = vc_read_next_word();                  /* 6 */
      base_color = vc_read_next_word();         /* 8 */

      /* 2nd param ignored with simon1 */
      if (has_vga_sprite_with_id(vga_sprite_id, f))
            return;

      vsp = _vga_sprites;
      while (vsp->id)
            vsp++;

      vsp->base_color = base_color;
      vsp->unk6 = a;
      vsp->priority = 0;
      vsp->unk4 = 0;
      vsp->image = 0;
      vsp->x = x;
      vsp->y = y;
      vsp->id = vga_sprite_id;
      vsp->unk7 = res = f;

      old_file_1 = _cur_vga_file_1;
      for (;;) {
            vpe = &_vga_buffer_pointers[res];
            _cur_vga_file_1 = vpe->vgaFile1;

            if (vpe->vgaFile1 != NULL)
                  break;
            if (_vga_cur_file_2 != res)
                  _video_var_7 = _vga_cur_file_2;

            ensureVgaResLoaded(res);
            _video_var_7 = 0xFFFF;
      }

      pp = _cur_vga_file_1;
      p = pp + READ_BE_UINT16(&((VgaFile1Header *) pp)->hdr2_start);
      p = pp + READ_BE_UINT16(&((VgaFile1Header2 *) p)->id_table);

      while (READ_BE_UINT16(&((VgaFile1Struct0x6 *) p)->id) != vga_sprite_id)
            p += sizeof(VgaFile1Struct0x6);

#ifdef DUMP_FILE_NR
      {
            static bool dumped = false;
            if (res == DUMP_FILE_NR && !dumped) {
                  dumped = true;
                  dump_vga_file(_cur_vga_file_1);
            }
      }
#endif

#ifdef DUMP_BITMAPS_FILE_NR
      {
            static bool dumped = false;
            if (res == DUMP_BITMAPS_FILE_NR && !dumped) {
                  dumped = true;
                  dump_vga_bitmaps(_cur_vga_file_2, _cur_vga_file_1, res);
            }
      }
#endif

      if (_start_vgascript)
            dump_vga_script(_cur_vga_file_1 + READ_BE_UINT16(&((VgaFile1Struct0x6*)p)->script_offs), res, vga_sprite_id);

      add_vga_timer(VGA_DELAY_BASE, _cur_vga_file_1 + READ_BE_UINT16(&((VgaFile1Struct0x6 *) p)->script_offs), vga_sprite_id, res);
      _cur_vga_file_1 = old_file_1;
}

void SimonEngine::vc_4_dummy_op() {
      /* dummy opcode */
      _vc_ptr += 6;
}

void SimonEngine::vc_5_skip_if_neq() {
      uint var = vc_read_next_word();
      uint value = vc_read_next_word();
      if (vc_read_var(var) != value)
            vc_skip_next_instruction();
}

void SimonEngine::vc_6_skip_ifn_sib_with_a() {
      if (!itemIsSiblingOf(vc_read_next_word()))
            vc_skip_next_instruction();
}

void SimonEngine::vc_7_skip_if_sib_with_a() {
      if (itemIsSiblingOf(vc_read_next_word()))
            vc_skip_next_instruction();
}

void SimonEngine::vc_8_skip_if_parent_is() {          
      uint a = vc_read_next_word();
      uint b = vc_read_next_word();
      if (!itemIsParentOf(a, b))
            vc_skip_next_instruction();
}

void SimonEngine::vc_9_skip_if_unk3_is() {
      uint a = vc_read_next_word();
      uint b = vc_read_next_word();
      if (!vc_maybe_skip_proc_1(a, b))
            vc_skip_next_instruction();
}

byte *vc_10_depack_column(VC10_state * vs) {
      int8 a = vs->depack_cont;
      byte *src = vs->depack_src;
      byte *dst = vs->depack_dest;
      byte dh = vs->dh;
      byte color;

      if (a == -0x80)
            a = *src++;

      for (;;) {
            if (a >= 0) {
                  color = *src++;
                  do {
                        *dst++ = color;
                        if (!--dh) {
                              if (--a < 0)
                                    a = -0x80;
                              else
                                    src--;
                              goto get_out;
                        }
                  } while (--a >= 0);
            } else {
                  do {
                        *dst++ = *src++;
                        if (!--dh) {
                              if (++a == 0)
                                    a = -0x80;
                              goto get_out;
                        }
                  } while (++a != 0);
            }
            a = *src++;
      }

get_out:;
      vs->depack_src = src;
      vs->depack_cont = a;
      return vs->depack_dest + vs->y_skip;
}

void vc_10_skip_cols(VC10_state *vs) {
      vs->depack_cont = -0x80;
      while (vs->x_skip) {
            vc_10_depack_column(vs);
            vs->x_skip--;
      }
}

byte *SimonEngine::vc_10_depack_swap(byte *src, uint w, uint h) {
      w <<= 3;

      {
            byte *dst_org = _video_buf_1 + w;
            byte color;
            int8 cur = -0x80;
            uint w_cur = w;

            do {
                  byte *dst = dst_org;
                  uint h_cur = h;

                  if (cur == -0x80)
                        cur = *src++;

                  for (;;) {
                        if (cur >= 0) {
                              /* rle_same */
                              color = *src++;
                              do {
                                    *dst = color;
                                    dst += w;
                                    if (!--h_cur) {
                                          if (--cur < 0)
                                                cur = -0x80;
                                          else
                                                src--;
                                          goto next_line;
                                    }
                              } while (--cur >= 0);
                        } else {
                              /* rle_diff */
                              do {
                                    *dst = *src++;
                                    dst += w;
                                    if (!--h_cur) {
                                          if (++cur == 0)
                                                cur = -0x80;
                                          goto next_line;
                                    }
                              } while (++cur != 0);
                        }
                        cur = *src++;
                  }
            next_line:
                  dst_org++;
            } while (--w_cur);
      }

      {
            byte *dst_org, *src_org;
            uint i;

            src_org = dst_org = _video_buf_1 + w;

            do {
                  byte *dst = dst_org;
                  for (i = 0; i != w; ++i) {
                        byte b = src_org[i];
                        b = (b >> 4) | (b << 4);
                        *--dst = b;
                  }

                  src_org += w;
                  dst_org += w;
            } while (--h);

      }

      return _video_buf_1;
}

byte *SimonEngine::vc_10_no_depack_swap(byte *src, uint w, uint h) {
      if (src == _vc_10_base_ptr_old)
            return _video_buf_1;

      _vc_10_base_ptr_old = src;
      h *= 8;
      byte *dst = _video_buf_1 + h - 1;

      uint h_cur = h;
      do {
            do {
                  *dst = *src << 4;
                  (*dst--) |= (*src++) >> 4;
            } while (--h_cur != 0);
            h_cur = h;
            dst += h * 2;
      } while (--w != 0);

      return _video_buf_1;
}

/* must not be const */
static uint16 _video_windows[128] = {
      0, 0, 20, 200,
      0, 0, 3, 136,
      17, 0, 3, 136,
      0, 0, 20, 200,
      0, 0, 20, 134
};

/* simon2 specific */
void SimonEngine::decodeStripA(byte *dst, byte *src, int height) {
      const uint pitch = _dx_surface_pitch;
      int8 reps = (int8)0x80;
      byte color;
      byte *dst_org = dst;
      uint h = height, w = 8;

      for (;;) {
            reps = *src++;
            if (reps >= 0) {
                  color = *src++;

                  do {
                        *dst = color;
                        dst += pitch;

                        /* reached bottom? */
                        if (--h == 0) {
                              /* reached right edge? */
                              if (--w == 0)
                                    return;
                              dst = ++dst_org;
                              h = height;
                        }
                  } while (--reps >= 0);
            } else {

                  do {
                        *dst = *src++;
                        dst += pitch;

                        /* reached bottom? */
                        if (--h == 0) {
                              /* reached right edge? */
                              if (--w == 0)
                                    return;
                              dst = ++dst_org;
                              h = height;
                        }
                  } while (++reps != 0);
            }
      }
}

void SimonEngine::vc_10_draw() {
      byte *p2;
      uint width, height;
      byte flags;
      const uint16 *vlut;
      VC10_state state;

      int cur;

      state.image = (int16)vc_read_next_word();
      if (state.image == 0)
            return;

      state.base_color = (_vc_ptr[1] << 4);
      _vc_ptr += 2;
      state.x = (int16)vc_read_next_word();
      if (_game & GF_SIMON2) {
            state.x -= _x_scroll;
      }
      state.y = (int16)vc_read_next_word();

      if (!(_game & GF_SIMON2)) {
            state.e = vc_read_next_word();
      } else {
            state.e = vc_read_next_byte();
      }

      if (state.image < 0)
            state.image = vc_read_var(-state.image);

      p2 = _cur_vga_file_2 + state.image * 8;
      state.depack_src = _cur_vga_file_2 + READ_BE_UINT32(p2);

      width = READ_BE_UINT16(p2 + 6) >> 4;
      height = p2[5];
      flags = p2[4];

      if (height == 0 || width == 0)
            return;

      if (_dump_images)
            dump_single_bitmap(_vga_cur_file_id, state.image, state.depack_src, width * 16, height,
                                                                   state.base_color);

      if (flags & 0x80 && !(state.e & 0x10)) {
            if (state.e & 1) {
                  state.e &= ~1;
                  state.e |= 0x10;
            } else {
                  state.e |= 0x8;
            }
      }

      if (_game & GF_SIMON2 && width >= 21) {
            byte *src, *dst;
            uint w;

            _vga_var1 = width * 2 - 40;
            _vga_var7 = state.depack_src;
            _vga_var5 = height;
            if (_variableArray[34] == -1)
                  state.x = _variableArray[251];

            _x_scroll = state.x;

            vc_write_var(0xfb, _x_scroll);

            dst = dx_lock_attached();
            src = state.depack_src + _x_scroll * 4;

            for (w = 0; w < 40; w++) {
                  decodeStripA(dst, src + READ_BE_UINT32(src), height);
                  dst += 8;
                  src += 4;
            }

            dx_unlock_attached();

            return;
      }

      if (state.e & 0x10) {
            state.depack_src = vc_10_depack_swap(state.depack_src, width, height);
      } else if (state.e & 1) {
            state.depack_src = vc_10_no_depack_swap(state.depack_src, width, height);
      }

      vlut = &_video_windows[_video_palette_mode * 4];

      state.draw_width = width << 1;      /* cl */
      state.draw_height = height;         /* ch */

      state.x_skip = 0;                                     /* colums to skip = bh */
      state.y_skip = 0;                                     /* rows to skip   = bl */

      cur = state.x;
      if (cur < 0) {
            do {
                  if (!--state.draw_width)
                        return;
                  state.x_skip++;
            } while (++cur);
      }
      state.x = cur;

      cur += state.draw_width - (vlut[2] << 1);
      if (cur > 0) {
            do {
                  if (!--state.draw_width)
                        return;
            } while (--cur);
      }

      cur = state.y;
      if (cur < 0) {
            do {
                  if (!--state.draw_height)
                        return;
                  state.y_skip++;
            } while (++cur);
      }
      state.y = cur;

      cur += state.draw_height - vlut[3];
      if (cur > 0) {
            do {
                  if (!--state.draw_height)
                        return;
            } while (--cur);
      }

      assert(state.draw_width != 0 && state.draw_height != 0);

      state.draw_width <<= 2;

      state.surf2_addr = dx_lock_2();
      state.surf2_pitch = _dx_surface_pitch;

      state.surf_addr = dx_lock_attached();
      state.surf_pitch = _dx_surface_pitch;

      {
            uint offs, offs2;
            // Allow one section of Simon the Sorcerer 1 introduction to be displayed
            // in lower half of screen
            if (!(_game & GF_SIMON2) && _subroutine == 2926) {
                  offs = ((vlut[0]) * 2 + state.x) * 8;
                  offs2 = (vlut[1] + state.y);
            } else {
                  offs = ((vlut[0] - _video_windows[16]) * 2 + state.x) * 8;
                  offs2 = (vlut[1] - _video_windows[17] + state.y);
            }

            state.surf2_addr += offs + offs2 * state.surf2_pitch;
            state.surf_addr += offs + offs2 * state.surf_pitch;
      }

      if (state.e & 0x20) {
            byte *mask, *src, *dst;
            byte h;
            uint w;

            state.x_skip <<= 2;
            state.dl = width;
            state.dh = height;

            vc_10_skip_cols(&state);

            w = 0;
            do {
                  mask = vc_10_depack_column(&state); /* esi */
                  src = state.surf2_addr + w * 2;     /* ebx */
                  dst = state.surf_addr + w * 2;      /* edi */

                  h = state.draw_height;
                  if (!(_game & GF_SIMON2) && vc_get_bit(88)) {
                        /* transparency */
                        do {
                              if (mask[0] & 0xF0) {
                                    if ((dst[0] & 0x0F0) == 0x20)
                                          dst[0] = src[0];
                              }
                              if (mask[0] & 0x0F) {
                                    if ((dst[1] & 0x0F0) == 0x20)
                                          dst[1] = src[1];
                              }
                              mask++;
                              dst += state.surf_pitch;
                              src += state.surf2_pitch;
                        } while (--h);
                  } else {
                        /* no transparency */
                        do {
                              if (mask[0] & 0xF0)
                                    dst[0] = src[0];
                              if (mask[0] & 0x0F)
                                    dst[1] = src[1];
                              mask++;
                              dst += state.surf_pitch;
                              src += state.surf2_pitch;
                        } while (--h);
                  }
            } while (++w != state.draw_width);

            /* vc_10_helper_5 */
      } else if (_lock_word & 0x20 && state.base_color == 0 || state.base_color == 0xC0) {
            byte *src, *dst;
            uint h, i;

            if (!(state.e & 8)) {
                  src = state.depack_src + (width * state.y_skip << 4) + (state.x_skip << 3);
                  dst = state.surf_addr;

                  state.draw_width *= 2;

                  if (state.e & 2) {
                        /* no transparency */
                        h = state.draw_height;
                        do {
                              memcpy(dst, src, state.draw_width);
                              dst += 320;
                              src += width * 16;
                        } while (--h);
                  } else {
                        /* transparency */
                        h = state.draw_height;
                        do {
                              for (i = 0; i != state.draw_width; i++)
                                    if (src[i])
                                          dst[i] = src[i];
                              dst += 320;
                              src += width * 16;
                        } while (--h);
                  }

            } else {
                  byte *dst_org = state.surf_addr;
                  src = state.depack_src;
                  /* AAAAAAAA BBBBBBBB CCCCCCCC DDDDDDDD EEEEEEEE
                   * aaaaabbb bbcccccd ddddeeee efffffgg ggghhhhh
                   */

                  if (state.e & 2) {
                        /* no transparency */
                        do {
                              uint count = state.draw_width >> 2;

                              dst = dst_org;
                              do {
                                    uint32 bits = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | (src[3]);

                                    dst[0] = (byte)((bits >> (32 - 5)) & 31);
                                    dst[1] = (byte)((bits >> (32 - 10)) & 31);
                                    dst[2] = (byte)((bits >> (32 - 15)) & 31);
                                    dst[3] = (byte)((bits >> (32 - 20)) & 31);
                                    dst[4] = (byte)((bits >> (32 - 25)) & 31);
                                    dst[5] = (byte)((bits >> (32 - 30)) & 31);

                                    bits = (bits << 8) | src[4];

                                    dst[6] = (byte)((bits >> (40 - 35)) & 31);
                                    dst[7] = (byte)((bits) & 31);

                                    dst += 8;
                                    src += 5;
                              } while (--count);
                              dst_org += 320;
                        } while (--state.draw_height);
                  } else {
                        /* transparency */
                        do {
                              uint count = state.draw_width >> 2;

                              dst = dst_org;
                              do {
                                    uint32 bits = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | (src[3]);
                                    byte tmp;

                                    tmp = (byte)((bits >> (32 - 5)) & 31);
                                    if (tmp)
                                          dst[0] = tmp;
                                    tmp = (byte)((bits >> (32 - 10)) & 31);
                                    if (tmp)
                                          dst[1] = tmp;
                                    tmp = (byte)((bits >> (32 - 15)) & 31);
                                    if (tmp)
                                          dst[2] = tmp;
                                    tmp = (byte)((bits >> (32 - 20)) & 31);
                                    if (tmp)
                                          dst[3] = tmp;
                                    tmp = (byte)((bits >> (32 - 25)) & 31);
                                    if (tmp)
                                          dst[4] = tmp;
                                    tmp = (byte)((bits >> (32 - 30)) & 31);
                                    if (tmp)
                                          dst[5] = tmp;

                                    bits = (bits << 8) | src[4];

                                    tmp = (byte)((bits >> (40 - 35)) & 31);
                                    if (tmp)
                                          dst[6] = tmp;
                                    tmp = (byte)((bits) & 31);
                                    if (tmp)
                                          dst[7] = tmp;

                                    dst += 8;
                                    src += 5;
                              } while (--count);
                              dst_org += 320;
                        } while (--state.draw_height);
                  }
            }
            /* vc_10_helper_4 */
      } else {
            if (_game & GF_SIMON2 && state.e & 0x4 && _bit_array[10] & 0x800) {
                  state.surf_addr = state.surf2_addr;
                  state.surf_pitch = state.surf2_pitch;
            }

            if (state.e & 0x8) {
                  uint w, h;
                  byte *src, *dst, *dst_org;

                  state.x_skip <<= 2;                       /* reached */
                  state.dl = width;
                  state.dh = height;

                  vc_10_skip_cols(&state);

                  if (state.e & 2) {
                        dst_org = state.surf_addr;
                        w = 0;
                        do {
                              src = vc_10_depack_column(&state);
                              dst = dst_org;

                              h = 0;
                              do {
                                    dst[0] = (*src >> 4) | state.base_color;
                                    dst[1] = (*src & 15) | state.base_color;
                                    dst += 320;
                                    src++;
                              } while (++h != state.draw_height);
                              dst_org += 2;
                        } while (++w != state.draw_width);
                  } else {
                        dst_org = state.surf_addr;
                        if (state.e & 0x40) {         /* reached */
                              dst_org += vc_read_var(252);
                        }
                        w = 0;
                        do {
                              byte color;

                              src = vc_10_depack_column(&state);
                              dst = dst_org;

                              h = 0;
                              do {
                                    color = (*src >> 4);
                                    if (color)
                                          dst[0] = color | state.base_color;
                                    color = (*src & 15);
                                    if (color)
                                          dst[1] = color | state.base_color;
                                    dst += 320;
                                    src++;
                              } while (++h != state.draw_height);
                              dst_org += 2;
                        } while (++w != state.draw_width);
                  }
                  /* vc_10_helper_6 */
            } else {
                  byte *src, *dst;
                  uint count;

                  src = state.depack_src + (width * state.y_skip) * 8;
                  dst = state.surf_addr;
                  state.x_skip <<= 2;
                  if (state.e & 2) {
                        do {
                              for (count = 0; count != state.draw_width; count++) {
                                    dst[count * 2] = (src[count + state.x_skip] >> 4) | state.base_color;
                                    dst[count * 2 + 1] = (src[count + state.x_skip] & 15) | state.base_color;
                              }
                              dst += 320;
                              src += width * 8;
                        } while (--state.draw_height);
                  } else {
                        do {
                              for (count = 0; count != state.draw_width; count++) {
                                    byte color;
                                    color = (src[count + state.x_skip] >> 4);
                                    if (color)
                                          dst[count * 2] = color | state.base_color;
                                    color = (src[count + state.x_skip] & 15);
                                    if (color)
                                          dst[count * 2 + 1] = color | state.base_color;
                              }
                              dst += 320;
                              src += width * 8;
                        } while (--state.draw_height);

                  }

                  /* vc_10_helper_7 */
            }
      }

      dx_unlock_2();
      dx_unlock_attached();

}

void SimonEngine::vc_11_clear_pathfind_array() {
      memset(&_pathfind_array, 0, sizeof(_pathfind_array));
}

void SimonEngine::vc_12_delay() {
      VgaSprite *vsp = find_cur_sprite();
      uint num;

      if (!(_game & GF_SIMON2)) {
            num = vc_read_var_or_word();
      } else {
            num = vc_read_next_byte() * _vga_base_delay;
      }

      // Work around to allow inventory arrows to be
      // shown in some versions of Simon the Sorcerer 1
      if (!(_game & GF_SIMON2) && !(_game & GF_WIN) && vsp->id == 0x80)
            num = 0;
      else
            num += VGA_DELAY_BASE;

      add_vga_timer(num, _vc_ptr, _vga_cur_sprite_id, _vga_cur_file_id);
      _vc_ptr = (byte *)&vc_get_out_of_code;
}

void SimonEngine::vc_13_set_sprite_offset_x() {
      VgaSprite *vsp = find_cur_sprite();
      vsp->x += (int16)vc_read_next_word();
      _vga_sprite_changed++;
}

void SimonEngine::vc_14_set_sprite_offset_y() {
      VgaSprite *vsp = find_cur_sprite();
      vsp->y += (int16)vc_read_next_word();
      _vga_sprite_changed++;
}

void SimonEngine::vc_15_wakeup_id() {
      VgaSleepStruct *vfs = _vga_sleep_structs, *vfs_tmp;
      uint16 id = vc_read_next_word();
      while (vfs->ident != 0) {
            if (vfs->ident == id) {
                  add_vga_timer(VGA_DELAY_BASE, vfs->code_ptr, vfs->sprite_id, vfs->cur_vga_file);
                  vfs_tmp = vfs;
                  do {
                        memcpy(vfs_tmp, vfs_tmp + 1, sizeof(VgaSleepStruct));
                        vfs_tmp++;
                  } while (vfs_tmp->ident != 0);
            } else {
                  vfs++;
            }
      }

      /* clear a wait event */
      if (id == _vga_wait_for)
            _vga_wait_for = 0;
}

void SimonEngine::vc_16_sleep_on_id() {
      VgaSleepStruct *vfs = _vga_sleep_structs;
      while (vfs->ident)
            vfs++;

      vfs->ident = vc_read_next_word();
      vfs->code_ptr = _vc_ptr;
      vfs->sprite_id = _vga_cur_sprite_id;
      vfs->cur_vga_file = _vga_cur_file_id;

      _vc_ptr = (byte *)&vc_get_out_of_code;
}

void SimonEngine::vc_17_set_pathfind_item() {
      uint a = vc_read_next_word();
      _pathfind_array[a - 1] = (uint16 *)_vc_ptr;
      while (READ_BE_UINT16(_vc_ptr) != 999)
            _vc_ptr += 4;
      _vc_ptr += 2;
}

void SimonEngine::vc_18_jump_rel() {
      int16 offs = vc_read_next_word();
      _vc_ptr += offs;
}

/* chain to script? */
void SimonEngine::vc_19_chain_to_script() {
      /* unused */
      error("vc_19_chain_to_script: not implemented");
}

/* helper routines */

/* write unaligned 16-bit */
static void write_16_le(void *p, uint16 a) {
      ((byte *)p)[0] = (byte)(a);
      ((byte *)p)[1] = (byte)(a >> 8);
}

/* read unaligned 16-bit */
static uint16 read_16_le(void *p) {
      return ((byte *)p)[0] | (((byte *)p)[1] << 8);
}

/* FIXME: unaligned access */
void SimonEngine::vc_20_set_code_word() {
      uint16 a = vc_read_next_word();
      write_16_le(_vc_ptr, a);
      _vc_ptr += 2;
}

/* FIXME: unaligned access */
void SimonEngine::vc_21_jump_if_code_word() {
      int16 a = vc_read_next_word();
      byte *tmp = _vc_ptr + a;
      if (_game & GF_SIMON2)
            tmp += 3;
      else
            tmp += 4;

      uint16 val = read_16_le(tmp);
      if (val != 0) {
            write_16_le(tmp, val - 1);
            _vc_ptr = tmp + 2;
      }
}

void SimonEngine::vc_22_set_sprite_palette() {
      uint a = vc_read_next_word();
      uint b = vc_read_next_word();
      uint num = a == 0 ? 0x20 : 0x10;
      byte *palptr, *src;

      palptr = &_palette[(a << 6)];

      src = _cur_vga_file_1 + 6 + b * 96;

      do {
            palptr[0] = src[0] << 2;
            palptr[1] = src[1] << 2;
            palptr[2] = src[2] << 2;
            palptr[3] = 0;

            palptr += 4;
            src += 3;
      } while (--num);

      _video_var_9 = 2;
      _vga_sprite_changed++;
}

void SimonEngine::vc_23_set_sprite_priority() {
      VgaSprite *vsp = find_cur_sprite(), *vus2;
      uint16 pri = vc_read_next_word();
      VgaSprite bak;

      if (vsp->id == 0)
            return;

      memcpy(&bak, vsp, sizeof(bak));
      bak.priority = pri;
      bak.unk6 |= 0x8000;

      vus2 = vsp;

      if (vsp != _vga_sprites && pri < vsp[-1].priority) {
            do {
                  vsp--;
            } while (vsp != _vga_sprites && pri < vsp[-1].priority);
            do {
                  memcpy(vus2, vus2 - 1, sizeof(VgaSprite));
            } while (--vus2 != vsp);
            memcpy(vus2, &bak, sizeof(VgaSprite));
      } else if (vsp[1].id != 0 && pri >= vsp[1].priority) {
            do {
                  vsp++;
            } while (vsp[1].id != 0 && pri >= vsp[1].priority);
            do {
                  memcpy(vus2, vus2 + 1, sizeof(VgaSprite));
            } while (++vus2 != vsp);
            memcpy(vus2, &bak, sizeof(VgaSprite));
      } else {
            vsp->priority = pri;
      }
      _vga_sprite_changed++;
}

void SimonEngine::vc_24_set_sprite_xy() {
      VgaSprite *vsp = find_cur_sprite();
      vsp->image = vc_read_var_or_word();

      vsp->x += (int16)vc_read_next_word();
      vsp->y += (int16)vc_read_next_word();
      if (!(_game & GF_SIMON2)) {
            vsp->unk4 = vc_read_next_word();
      } else {
            vsp->unk4 = vc_read_next_byte();
      }

      _vga_sprite_changed++;
}

void SimonEngine::vc_25_halt_sprite() {
      VgaSprite *vsp = find_cur_sprite();
      while (vsp->id != 0) {
            memcpy(vsp, vsp + 1, sizeof(VgaSprite));
            vsp++;
      }
      _vc_ptr = (byte *)&vc_get_out_of_code;
      _vga_sprite_changed++;
}

void SimonEngine::vc_26_set_window() {
      uint16 *as = &_video_windows[vc_read_next_word() * 4];
      as[0] = vc_read_next_word();
      as[1] = vc_read_next_word();
      as[2] = vc_read_next_word();
      as[3] = vc_read_next_word();
}

void SimonEngine::vc_27_reset_simon1() {
      VgaSprite bak, *vsp;
      VgaSleepStruct *vfs;
      VgaTimerEntry *vte, *vte2;

      _lock_word |= 8;

      memset(&bak, 0, sizeof(bak));

      vsp = _vga_sprites;
      while (vsp->id) {
            if (vsp->id == 0x80) {
                  memcpy(&bak, vsp, sizeof(VgaSprite));
            }
            vsp->id = 0;
            vsp++;
      }

      if (bak.id != 0)
            memcpy(_vga_sprites, &bak, sizeof(VgaSprite));

      vfs = _vga_sleep_structs;
      while (vfs->ident) {
            vfs->ident = 0;
            vfs++;
      }

      vte = _vga_timer_list;
      while (vte->delay) {
            if (vte->sprite_id != 0x80) {
                  vte2 = vte;
                  while (vte2->delay) {
                        memcpy(vte2, vte2 + 1, sizeof(VgaTimerEntry));
                        vte2++;
                  }
            } else {
                  vte++;
            }
      }

      vc_write_var(0xFE, 0);

      _lock_word &= ~8;
}

void SimonEngine::vc_27_reset_simon2() {
      _lock_word |= 8;

      {
            VgaSprite *vsp = _vga_sprites;
            while (vsp->id) {
                  vsp->id = 0;
                  vsp++;
            }
      }

      {
            VgaSleepStruct *vfs = _vga_sleep_structs;
            while (vfs->ident) {
                  vfs->ident = 0;
                  vfs++;
            }
      }

      {
            VgaTimerEntry *vte = _vga_timer_list;
            while (vte->delay) {
                  VgaTimerEntry *vte2 = vte;
                  while (vte2->delay) {
                        memcpy(vte2, vte2 + 1, sizeof(VgaTimerEntry));
                        vte2++;
                  }
            }
      }

      vc_write_var(0xFE, 0);

      _lock_word &= ~8;
}

void SimonEngine::vc_27_reset() {
      if (!(_game & GF_SIMON2))
            vc_27_reset_simon1();
      else
            vc_27_reset_simon2();
}

void SimonEngine::vc_28_dummy_op() {
      /* unused */
      _vc_ptr += 8;
}

void SimonEngine::vc_29_stop_all_sounds() {
      _sound->stopAll();
}

void SimonEngine::vc_30_set_base_delay() {
      _vga_base_delay = vc_read_next_word();
}

void SimonEngine::vc_31_set_palette_mode() {
      _video_palette_mode = vc_read_next_word();
}

uint SimonEngine::vc_read_var(uint var) {
      assert(var < 255);
      return (uint16)_variableArray[var];
}

void SimonEngine::vc_write_var(uint var, int16 value) {
      _variableArray[var] = value;
}

void SimonEngine::vc_32_copy_var() {
      uint16 a = vc_read_var(vc_read_next_word());
      vc_write_var(vc_read_next_word(), a);
}

void SimonEngine::vc_33_force_unlock() {
      if (_lock_counter != 0) {
            _lock_counter = 1;
            unlock();
      }
}

void SimonEngine::vc_34_force_lock() {
      lock();
      _lock_counter = 200;
      _left_button_down = 0;
}

void SimonEngine::vc_35() {
      /* unused */
      _vc_ptr += 4;
      _vga_sprite_changed++;
}

void SimonEngine::vc_36_saveload_thing() {
      _video_var_8 = false;
      uint vga_res = vc_read_next_word();
      uint mode = vc_read_next_word();

      if (!(_game & GF_SIMON2)) {
            if (mode == 16) {
                  _copy_partial_mode = 2;
            } else {
                  set_video_mode_internal(mode, vga_res);
            }
      } else {
            set_video_mode_internal(mode, vga_res);
      }
}

void SimonEngine::vc_37_set_sprite_offset_y() {
      VgaSprite *vsp = find_cur_sprite();
      vsp->y += vc_read_var(vc_read_next_word());
      _vga_sprite_changed++;
}

void SimonEngine::vc_38_skip_if_var_zero() {
      uint var = vc_read_next_word();
      if (vc_read_var(var) == 0)
            vc_skip_next_instruction();
}

void SimonEngine::vc_39_set_var() {
      uint var = vc_read_next_word();
      int16 value = vc_read_next_word();
      vc_write_var(var, value);
}

void SimonEngine::vc_40_var_add() {
      uint var = vc_read_next_word();
      int16 value = vc_read_var(var) + vc_read_next_word();

      if (_game & GF_SIMON2 && var == 0xF && !(_bit_array[5] & 1)) {
            int16 tmp;

            if (_vga_var2 != 0) {
                  if (_vga_var2 >= 0)
                        goto no_scroll;
                  _vga_var2 = 0;
            } else {
                  if (_vga_var3 != 0)
                        goto no_scroll;
            }

            if (value - _x_scroll >= 30) {
                  _vga_var2 = 20;
                  tmp = _vga_var1 - _x_scroll;
                  if (tmp < 20)
                        _vga_var2 = tmp;
                  add_vga_timer(6, NULL, 0, 0); /* special timer */
            }
      }
no_scroll:;

      vc_write_var(var, value);
}

void SimonEngine::vc_41_var_sub() {
      uint var = vc_read_next_word();
      int16 value = vc_read_var(var) - vc_read_next_word();

      if (_game & GF_SIMON2 && var == 0xF && !(_bit_array[5] & 1)) {
            int16 tmp;

            if (_vga_var2 != 0) {
                  if (_vga_var2 < 0)
                        goto no_scroll;
                  _vga_var2 = 0;
            } else {
                  if (_vga_var3 != 0)
                        goto no_scroll;
            }

            if ((uint16)(value - _x_scroll) < 11) {
                  _vga_var2 = -20;
                  tmp = _vga_var1 - _x_scroll;
                  if (_x_scroll < 20)
                        _vga_var2 = -_x_scroll;
                  add_vga_timer(6, NULL, 0, 0); /* special timer */
            }
      }
no_scroll:;

      vc_write_var(var, value);
}

void SimonEngine::vc_42_delay_if_not_eq() {
      uint val = vc_read_var(vc_read_next_word());
      if (val != vc_read_next_word()) {

            add_vga_timer(_vga_base_delay + 1, _vc_ptr - 4, _vga_cur_sprite_id, _vga_cur_file_id);
            _vc_ptr = (byte *)&vc_get_out_of_code;
      }
}

void SimonEngine::vc_43_skip_if_bit_clear() {
      if (!vc_get_bit(vc_read_next_word())) {
            vc_skip_next_instruction();
      }
}

void SimonEngine::vc_44_skip_if_bit_set() {
      if (vc_get_bit(vc_read_next_word())) {
            vc_skip_next_instruction();
      }
}

void SimonEngine::vc_45_set_sprite_x() {
      VgaSprite *vsp = find_cur_sprite();
      vsp->x = vc_read_var(vc_read_next_word());
      _vga_sprite_changed++;
}

void SimonEngine::vc_46_set_sprite_y() {
      VgaSprite *vsp = find_cur_sprite();
      vsp->y = vc_read_var(vc_read_next_word());
      _vga_sprite_changed++;
}

void SimonEngine::vc_47_add_var_f() {
      uint var = vc_read_next_word();
      vc_write_var(var, vc_read_var(var) + vc_read_var(vc_read_next_word()));
}

void SimonEngine::vc_48() {
      uint a = (uint16)_variableArray[12];
      uint b = (uint16)_variableArray[13];
      int c = _variableArray[14];
      uint16 *p = _pathfind_array[a - 1];
      int step;
      int y1, y2;
      int16 *vp;

      p += b * 2 + 1;

      step = 2;
      if (c < 0) {
            c = -c;
            step = -2;
      }

      vp = &_variableArray[20];

      do {
            y2 = READ_BE_UINT16(p);
            p += step;
            y1 = READ_BE_UINT16(p) - y2;

            vp[0] = y1 >> 1;
            vp[1] = y1 - (y1 >> 1);

            vp += 2;
      } while (--c);
}

void SimonEngine::vc_set_bit_to(uint bit, bool value) {
      uint16 *bits = &_bit_array[bit >> 4];
      *bits = (*bits & ~(1 << (bit & 15))) | (value << (bit & 15));
}

bool SimonEngine::vc_get_bit(uint bit) {
      uint16 *bits = &_bit_array[bit >> 4];
      return (*bits & (1 << (bit & 15))) != 0;
}

void SimonEngine::vc_49_set_bit() {
      vc_set_bit_to(vc_read_next_word(), true);
}

void SimonEngine::vc_50_clear_bit() {
      vc_set_bit_to(vc_read_next_word(), false);
}

void SimonEngine::vc_51_clear_hitarea_bit_0x40() {
      clear_hitarea_bit_0x40(vc_read_next_word());
}

void SimonEngine::vc_52_play_sound() {
      uint16 sound_id = vc_read_next_word();

      if (_game == GAME_SIMON1DOS) {
                  playSting(sound_id);
      } else if (!(_game & GF_SIMON2)) {
            _sound->playEffects(sound_id);
      } else {
            if (sound_id >= 0x8000) {
                  sound_id = -sound_id;
                  _sound->playAmbient(sound_id);
            } else {
                  _sound->playEffects(sound_id);
            }
      }
}

void SimonEngine::vc_53_no_op() {
      /* unused */
      _vc_ptr += 4;
}

void SimonEngine::vc_54_no_op() {
      /* unused */
      _vc_ptr += 6;
}

void SimonEngine::vc_55_offset_hit_area() {
      HitArea *ha = _hit_areas;
      uint count = ARRAYSIZE(_hit_areas);
      uint16 id = vc_read_next_word();
      int16 x = vc_read_next_word();
      int16 y = vc_read_next_word();

      for (;;) {
            if (ha->id == id) {
                  ha->x += x;
                  ha->y += y;
                  break;
            }
            ha++;
            if (!--count)
                  break;
      }

      _need_hitarea_recalc++;
}

void SimonEngine::vc_56_delay() {
      if (_game & GF_SIMON2) {
            uint num = vc_read_var_or_word() * _vga_base_delay;

            add_vga_timer(num + VGA_DELAY_BASE, _vc_ptr, _vga_cur_sprite_id, _vga_cur_file_id);
            _vc_ptr = (byte *)&vc_get_out_of_code;
      }
}

void SimonEngine::vc_59() {
      if (_game & GF_SIMON2) {
            uint file = vc_read_next_word();
            uint start = vc_read_next_word();
            uint end = vc_read_next_word() + 1;

            do {
                  vc_kill_sprite(file, start);
            } while (++start != end);
      } else {
            if (!_sound->_voice_handle.isActive())
                  vc_skip_next_instruction();
      }
}

void SimonEngine::vc_58() {
      uint sprite = _vga_cur_sprite_id;
      uint file = _vga_cur_file_id;
      byte *vc_ptr_org;
      uint16 tmp;

      _vga_cur_file_id = vc_read_next_word();
      _vga_cur_sprite_id = vc_read_next_word();

      tmp = TO_BE_16(vc_read_next_word());

      vc_ptr_org = _vc_ptr;
      _vc_ptr = (byte *)&tmp;
      vc_23_set_sprite_priority();

      _vc_ptr = vc_ptr_org;
      _vga_cur_sprite_id = sprite;
      _vga_cur_file_id = file;
}

void SimonEngine::vc_57_no_op() {
      /* unused */
}

void SimonEngine::vc_kill_sprite(uint file, uint sprite) {
      uint16 old_sprite_id, old_cur_file_id;
      VgaSleepStruct *vfs;
      VgaSprite *vsp;
      VgaTimerEntry *vte;
      byte *vc_ptr_org;

      old_sprite_id = _vga_cur_sprite_id;
      old_cur_file_id = _vga_cur_file_id;
      vc_ptr_org = _vc_ptr;

      _vga_cur_file_id = file;
      _vga_cur_sprite_id = sprite;

      vfs = _vga_sleep_structs;
      while (vfs->ident != 0) {
            if (vfs->sprite_id == _vga_cur_sprite_id
                        && (vfs->cur_vga_file == _vga_cur_file_id || !(_game & GF_SIMON2))
                  ) {
                  while (vfs->ident != 0) {
                        memcpy(vfs, vfs + 1, sizeof(VgaSleepStruct));
                        vfs++;
                  }
                  break;
            }
            vfs++;
      }

      vsp = find_cur_sprite();
      if (vsp->id) {
            vc_25_halt_sprite();

            vte = _vga_timer_list;
            while (vte->delay != 0) {
                  if (vte->sprite_id == _vga_cur_sprite_id
                              && (vte->cur_vga_file == _vga_cur_file_id || !(_game & GF_SIMON2))
                        ) {
                        delete_vga_timer(vte);
                        break;
                  }
                  vte++;
            }
      }

      _vga_cur_file_id = old_cur_file_id;
      _vga_cur_sprite_id = old_sprite_id;
      _vc_ptr = vc_ptr_org;
}

void SimonEngine::vc_60_kill_sprite() {
      uint file;

      if (_game & GF_SIMON2) {
            file = vc_read_next_word();
      } else {
            file = _vga_cur_file_id;
      }
      uint sprite = vc_read_next_word();
      vc_kill_sprite(file, sprite);
}

void SimonEngine::vc_61_sprite_change() {
      VgaSprite *vsp = find_cur_sprite();

      vsp->image = vc_read_var_or_word();

      vsp->x += vc_read_next_word();
      vsp->y += vc_read_next_word();
      vsp->unk4 = 36;

      _vga_sprite_changed++;
}

void SimonEngine::vc_62_palette_thing() {
      uint i;

      vc_29_stop_all_sounds();

      if (!_video_var_3) {
            _video_var_3 = true;

            _video_num_pal_colors = 256;
            if (_video_palette_mode == 4)
                  _video_num_pal_colors = 208;

            memcpy(_video_buf_1, _palette_backup, _video_num_pal_colors * sizeof(uint32));
            for (i = NUM_PALETTE_FADEOUT; i != 0; --i) {
                  palette_fadeout((uint32 *)_video_buf_1, _video_num_pal_colors);
                  _system->setPalette(_video_buf_1, 0, _video_num_pal_colors);
                  if (_fade)
                        _system->updateScreen();
                  delay(5);
            }

            if (!(_game & GF_SIMON2)) {
                  uint16 params[5];                               /* parameters to vc_10_draw */
                  VgaSprite *vsp;
                  VgaPointersEntry *vpe;
                  byte *vc_ptr_org = _vc_ptr;

                  vsp = _vga_sprites;
                  while (vsp->id != 0) {
                        if (vsp->id == 0x80) {
                              byte *old_file_1 = _cur_vga_file_1;
                              byte *old_file_2 = _cur_vga_file_2;
                              uint palmode = _video_palette_mode;
      
                              vpe = &_vga_buffer_pointers[vsp->unk7];
                              _cur_vga_file_1 = vpe->vgaFile1;
                              _cur_vga_file_2 = vpe->vgaFile2;
                              _video_palette_mode = vsp->unk6;

                              params[0] = READ_BE_UINT16(&vsp->image);
                              params[1] = READ_BE_UINT16(&vsp->base_color);
                              params[2] = READ_BE_UINT16(&vsp->x);
                              params[3] = READ_BE_UINT16(&vsp->y);
                              params[4] = READ_BE_UINT16(&vsp->unk4);
                              _vc_ptr = (byte *)params;
                              vc_10_draw();

                              _video_palette_mode = palmode;
                              _cur_vga_file_1 = old_file_1;
                              _cur_vga_file_2 = old_file_2;
                              break;
                        }
                        vsp++;
                  }
                  _vc_ptr = vc_ptr_org;
            }

            // Allow one section of Simon the Sorcerer 1 introduction to be displayed
            // in lower half of screen
            if (!(_game & GF_SIMON2) && (_subroutine == 2923 || _subroutine == 2926))
                  dx_clear_surfaces(200);
            else
                  dx_clear_surfaces(_video_palette_mode == 4 ? 134 : 200);
      }
      if (_game & GF_SIMON2) {
            if (_next_music_to_play != -1)
                  loadMusic(_next_music_to_play);
      }

}

void SimonEngine::vc_63_palette_thing_2() {
      _palette_color_count = 208;
      if (_video_palette_mode != 4) {
            _palette_color_count = 256;
      }
      _video_var_3 = false;
}

void SimonEngine::vc_64_skip_if_no_speech() {
      // Simon2
      if (!_sound->_voice_handle.isActive() || (_subtitles && _language != 20))
            vc_skip_next_instruction();
}

void SimonEngine::vc_65_palette_thing_3() {
      // Simon2
      _palette_color_count = 624;
      _video_num_pal_colors = 208;
      if (_video_palette_mode != 4) {
            _palette_color_count = 768;
            _video_num_pal_colors = 256;
      }
      _palette_color_count |= 0x8000;
      _video_var_3 = false;
}

void SimonEngine::vc_66_skip_if_nz() {
      // Simon2
      uint a = vc_read_next_word();
      uint b = vc_read_next_word();

      if (vc_read_var(a) != vc_read_var(b))
            vc_skip_next_instruction();
}

void SimonEngine::vc_67_skip_if_ge() {
      // Simon2
      uint a = vc_read_next_word();
      uint b = vc_read_next_word();

      if (vc_read_var(a) >= vc_read_var(b))
            vc_skip_next_instruction();
}

void SimonEngine::vc_68_skip_if_le() {
      // Simon2
      uint a = vc_read_next_word();
      uint b = vc_read_next_word();

      if (vc_read_var(a) <= vc_read_var(b))
            vc_skip_next_instruction();
}

void SimonEngine::vc_69_play_track() {
      // Simon2
      int16 track = vc_read_next_word();
      int16 loop = vc_read_next_word();

      // Jamieson630:
      // This is a "play track". The original
      // design stored the track to play if one was
      // already in progress, so that the next time a
      // "fill MIDI stream" event occured, the MIDI
      // player would find the change and switch
      // tracks. We use a different architecture that
      // allows for an immediate response here, but
      // we'll simulate the variable changes so other
      // scripts don't get thrown off.
      // NOTE: This opcode looks very similar in function
      // to vc_72(), except that vc_72() may allow for
      // specifying a non-valid track number (999 or -1)
      // as a means of stopping what music is currently
      // playing.
      midi.setLoop(loop != 0);
      midi.startTrack(track);
}

void SimonEngine::vc_70_queue_music() {
      // Simon2
      uint16 track = vc_read_next_word();
      uint16 loop = vc_read_next_word();

      // Jamieson630:
      // This sets the "on end of track" action.
      // It specifies whether to loop the current
      // track and, if not, whether to switch to
      // a different track upon completion.
      if (track != 0xFFFF && track != 999)
            midi.queueTrack(track, loop != 0);
      else
            midi.setLoop(loop != 0);
}

void SimonEngine::vc_71_check_music_queue() {
      // Simon2
      // Jamieson630:
      // This command skips the next instruction
      // unless (1) there is a track playing, AND
      // (2) there is a track queued to play after it.
      if (!midi.isPlaying (true))
            vc_skip_next_instruction();
}

void SimonEngine::vc_72_play_track_2() {
      // Simon2
      // Jamieson630:
      // This is a "play or stop track". Note that
      // this opcode looks very similar in function
      // to vc_69(), except that this opcode may allow
      // for specifying a track of 999 or -1 in order to
      // stop the music. We'll code it that way for now.

      // NOTE: It's possible that when "stopping" a track,
      // we're supposed to just go on to the next queued
      // track, if any. Must find out if there is ANY
      // case where this is used to stop a track in the
      // first place.

      int16 track = vc_read_next_word();
      int16 loop = vc_read_next_word();

      if (track == -1 || track == 999) {
            midi.stop();
      } else {
            midi.setLoop (loop != 0);
            midi.startTrack (track);
      }
}

void SimonEngine::vc_73_set_op189_flag() {
      // Simon2
      vc_read_next_byte();
      _op_189_flags |= 1 << vc_read_next_byte();
}

void SimonEngine::vc_74_clear_op189_flag() {
      // Simon2
      vc_read_next_byte();
      _op_189_flags &= ~(1 << vc_read_next_byte());
}

} // End of namespace Simon

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