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Overview
Comment:Implement sliding
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SHA1: 1490be64d59906c78dd6c1d36d2353e613bba548
User & Date: user on 2021-01-03 09:43:55
Other Links: manifest | tags
Context
2021-01-04
00:39
Start to implement replay. (The replay implementation is not yet complete; it doesn't display the replay list anywhere, nor does it save it, nor replay solutions.) check-in: 1c62f22813 user: user tags: trunk
2021-01-03
09:43
Implement sliding check-in: 1490be64d5 user: user tags: trunk
2021-01-01
04:13
Change the logic for movement; this way seems to be closer to how it works in Hero Mesh, due to my experiments check-in: c53823977e user: user tags: trunk
Changes
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Modified class.doc from [4eb22afd16] to [f0b38ad4c2].

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bit22 *
  Prevents movement regardless of Height, but may still allow sliding.

bit23 *
  Reserved for future.

bit24 *
  Allows sliding to the left regardless of Height; the other attributes
  still need to be correct (unless bit26 is set). The game engine sets
  Reserved for future.
  this bit if the Climb/Height is OK for moving.

bit25 *
  Allows sliding to the right regardless of Height; the other attributes
  still need to be correct (unless bit27 is set). The game engine sets
  Reserved for future.
  this bit if the Climb/Height is OK for moving.

bit26
bit26 *
  Available for your own use; preserved across restarts.
  Allows hitting to the left regardless of Shape, Volume, etc. In order
  to actually move when sliding to the left, both bit24 and bit26 must
  be set, and bit7 must be clear.

bit27
bit27 *
  Available for your own use; preserved across restarts.
  Allows hitting to the right regardless of Shape, Volume, etc. In order
  to actually move when sliding to the right, both bit25 and bit27 must
  be set, and bit7 must be clear.

bit28
  Available for your own use.

bit29
  Available for your own use.
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Modified exec.c from [009b283128] to [d29672c800].

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      }
    }
  }
  // The OF_MOVED flag is set elsewhere, not here
  o->oflags&=~OF_DONE;
  return 1;
}

static inline int slide_test(Object*o,Object*oF,Uint32 d1,Uint32 d2,Uint32 vol) {
  // Checks if sliding is possible, except the height of the target location.
  Uint8 m=(o->shape&(1<<d1))|(oF->shape&(1<<(4^d1)));
  if(!(m&(m-1))) return 0;
  if(!(o->shovable&(1<<d2))) return 0;
  if(height_at(o->x+x_delta[d2],o->y+y_delta[d2])<=o->climb) return 1;
  return vol+volume_at(o->x+x_delta[d2],o->y+y_delta[d2])<=max_volume;
}

static int move_dir(Uint32 from,Uint32 obj,Uint32 dir) {
  // This function is complicated, and there may be mistakes.
  Object*o;
  Object*oE;
  Object*oF;
  Uint32 objE,objF,objLF,objRF;
  Uint32 hit=0;
  Uint32 vol;
  Value v;
  if(StackProtection()) Throw("Call stack overflow during movement");
  if(obj==VOIDLINK) return 0;
  o=objects[obj];
  o->dir=dir=resolve_dir(obj,dir);
  if(o->weight>o->inertia) goto fail;
  o->inertia-=o->weight;
  restart:
  if(hit&0x100000) dir=o->dir;
  objF=obj_dir(obj,dir);
  if(objF==VOIDLINK) goto fail;
  if(hit) hit=(hit&0x0C000000)|0x800;
  if(hit) hit=0x800;
  oF=objects[objF];
  objLF=obj_dir(obj,(dir+1)&7);
  objRF=obj_dir(obj,(dir-1)&7);
  if(height_at(oF->x,oF->y)<=o->climb) hit|=0x200000;
  if(dir&1) {
    // Diagonal movement
    hit|=0x80000;
    objLF=obj_dir(obj,(dir+1)&7);
    objRF=obj_dir(obj,(dir-1)&7);
    vol=o->volume;
    if(objLF!=VOIDLINK) vol+=volume_at(objects[objLF]->x,objects[objLF]->y);
    if(objRF!=VOIDLINK) vol+=volume_at(objects[objRF]->x,objects[objRF]->y);
    if(vol<=max_volume) {
      objE=objF;
      while(objE!=VOIDLINK) {
        if(o->oflags&(OF_DESTROYED|OF_VISUALONLY)) break;
        oE=objects[objE];
        if(oE->height>0) {
          hit&=0xFC287000;
          v=send_message(objE,obj,MSG_HIT,NVALUE(oE->x),NVALUE(oE->y),NVALUE(hit));
          if(v.t) Throw("Type mismatch in HIT/HITBY");
          hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
          hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
          if(hit&8) goto fail;
          if(!(hit&0x11)) {
            v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(hit));
            if(v.t) Throw("Type mismatch in HIT/HITBY");
            hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
            hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
            if(hit&8) goto fail;
          }
        }
        objE=obj_below(objE);
      }
      if((hit&0x200000) && !(hit&0x402008)) {
        if(hit&0x20000) goto success;
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        }
        objE=obj_below(objE);
      }
    }
  } else {
    // Orthogonal movement
    if(!oF) goto fail;
    if(o->shape) {
      // Check if attributes allow sliding
      vol=o->volume+volume_at(oF->x,oF->y);
      if(objLF!=VOIDLINK && slide_test(o,oF,dir,(dir+2)&7,vol)) {
        hit|=0x4000000;
        oE=objects[objLF];
        if(height_at(oE->x,oE->y)<=o->climb) hit|=0x1000000;
      }
      if(objRF!=VOIDLINK && slide_test(o,oF,dir|1,(dir-2)&7,vol)) {
        hit|=0x8000000;
        oE=objects[objRF];
        if(height_at(oE->x,oE->y)<=o->climb) hit|=0x2000000;
      }
    }
    objE=objF;
    while(objE!=VOIDLINK) {
      if(o->oflags&(OF_DESTROYED|OF_VISUALONLY)) break;
      oE=objects[objE];
      if(oE->height>0) {
        hit&=~7;
        // HIT/HITBY messages
        v=send_message(objE,obj,MSG_HIT,NVALUE(oE->x),NVALUE(oE->y),NVALUE(hit));
        if(v.t) Throw("Type mismatch in HIT/HITBY");
        hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
        hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
        if(hit&8) goto fail;
        if(!(hit&0x11)) {
          v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(hit));
          if(v.t) Throw("Type mismatch in HIT/HITBY");
          hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xFC098F7F:-1);
          hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
        }
        if(hit&0x108) goto fail;
        // Hardness/sharpness
        if(!(hit&0x22)) {
          if(o->sharp[dir>>1]>oE->hard[(dir^4)>>1] && !v_bool(destroy(obj,objE,2))) hit|=0x8004;
          if(oE->sharp[(dir^4)>>1]>o->hard[dir>>1] && !v_bool(destroy(objE,obj,1))) hit|=0x4C;
        }
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    if((hit&0x200000) && !(hit&0x400000)) {
      if(hit&0x20000) goto success;
      if(move_to(from,obj,oF->x,oF->y)) goto success; else goto fail;
    }
    // Sliding
    if(hit&0x80) goto fail;
    hit|=0x10000;
    if(hit&0x8000000) {
      hit&=0xF010000;
      objE=objRF;
      while(objE!=VOIDLINK) {
        if(o->oflags&(OF_DESTROYED|OF_VISUALONLY)) break;
        oE=objects[objE];
        if(oE->height>0) {
          hit&=~7;
          // HIT/HITBY messages
          v=send_message(objE,obj,MSG_HIT,NVALUE(oE->x),NVALUE(oE->y),NVALUE(hit));
          if(v.t) Throw("Type mismatch in HIT/HITBY");
          hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
          if(hit&8) goto otherside;
          if(!(hit&0x11)) {
            v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(hit));
            if(v.t) Throw("Type mismatch in HIT/HITBY");
            hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
    
          }
          if(hit&0x108) goto otherside;
          // Hardness/sharpness
          if(!(hit&0x22)) {
            if(o->sharp[dir>>1]>oE->hard[(dir^4)>>1] && !v_bool(destroy(obj,objE,2))) hit|=0x8004;
            if(oE->sharp[(dir^4)>>1]>o->hard[dir>>1] && !v_bool(destroy(objE,obj,1))) hit|=0x4C;
          }
        }
        if(hit&0x600) goto otherside;
        objE=obj_below(objE);
      }
      if((hit&0x48000)==0x8000) goto restart;
      if((hit&0x2000000) && !(hit&0x400080)) {
        if(hit&0x20000) goto success;
        if(move_to(from,obj,objects[objRF]->x,objects[objRF]->y)) goto success;
      }
    }
    otherside:
    if(hit&0x4000000) {
      hit&=0xF010000;
      objE=objLF;
      while(objE!=VOIDLINK) {
        if(o->oflags&(OF_DESTROYED|OF_VISUALONLY)) break;
        oE=objects[objE];
        if(oE->height>0) {
          hit&=~7;
          // HIT/HITBY messages
          v=send_message(objE,obj,MSG_HIT,NVALUE(oE->x),NVALUE(oE->y),NVALUE(hit));
          if(v.t) Throw("Type mismatch in HIT/HITBY");
          hit|=v.u&(classes[o->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
          if(hit&8) goto fail;
          if(!(hit&0x11)) {
            v=send_message(obj,objE,MSG_HITBY,NVALUE(o->x),NVALUE(o->y),NVALUE(hit));
            if(v.t) Throw("Type mismatch in HIT/HITBY");
            hit|=v.u&(classes[oE->class]->cflags&CF_COMPATIBLE?0xF0098F7F:-1);
          }
          if(hit&0x108) goto fail;
          // Hardness/sharpness
          if(!(hit&0x22)) {
            if(o->sharp[dir>>1]>oE->hard[(dir^4)>>1] && !v_bool(destroy(obj,objE,2))) hit|=0x8004;
            if(oE->sharp[(dir^4)>>1]>o->hard[dir>>1] && !v_bool(destroy(objE,obj,1))) hit|=0x4C;
          }
        }
        if(hit&0x600) goto fail;
        objE=obj_below(objE);
      }
      if((hit&0x48000)==0x8000) goto restart;
      if((hit&0x1000000) && !(hit&0x400080)) {
        if(hit&0x20000) goto success;
        if(move_to(from,obj,objects[objLF]->x,objects[objLF]->y)) goto success;
      }
    }
  }
  fail: if(hit&0x1000) goto success; o->inertia=0; return 0;
  success: if(!(hit&0x4000)) o->oflags|=OF_MOVED; return 1;
}

static int jump_to(Uint32 from,Uint32 n,Uint32 x,Uint32 y) {
  int xx,yy;
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