src/obstacle/BaseBuilding.cxx

/* bzflag
 * Copyright (c) 1993-2021 Tim Riker
 *
 * This package is free software;  you can redistribute it and/or
 * modify it under the terms of the license found in the file
 * named COPYING that should have accompanied this file.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "common.h"
#include <math.h>
#include "global.h"
#include "Pack.h"
#include "BaseBuilding.h"
#include "Intersect.h"
#include "MeshTransform.h"


const char*     BaseBuilding::typeName = "BaseBuilding";

BaseBuilding::BaseBuilding()
{
}

BaseBuilding::BaseBuilding(const float *p, float rotation,
                           const float *_size, int _team, bool rico) :
    Obstacle(p, rotation, _size[0], _size[1], _size[2], false, false, rico),
    team(_team)
{
    finalize();
    return;
}

BaseBuilding::~BaseBuilding()
{
    // do nothing
}

void BaseBuilding::finalize()
{
    Obstacle::setExtents();
    return;
}

Obstacle* BaseBuilding::copyWithTransform(const MeshTransform& xform) const
{
    float newPos[3], newSize[3], newAngle;
    memcpy(newPos, pos, sizeof(float[3]));
    memcpy(newSize, size, sizeof(float[3]));
    newAngle = angle;

    MeshTransform::Tool tool(xform);
    bool flipped;
    tool.modifyOldStyle(newPos, newSize, newAngle, flipped);

    BaseBuilding* copy = new BaseBuilding(newPos, newAngle, newSize, team, ricochet);

    return copy;
}

const char*     BaseBuilding::getType() const
{
    return typeName;
}

const char*     BaseBuilding::getClassName()
{
    return typeName;
}

float           BaseBuilding::intersect(const Ray &r) const
{
    return timeRayHitsBlock(r, getPosition(), getRotation(),
                            getWidth(), getBreadth(), getHeight());
}

void            BaseBuilding::getNormal(const float *p, float *n) const
{
    getNormalRect(p, getPosition(), getRotation(), getWidth(), getBreadth(), n);
}

void            BaseBuilding::get3DNormal(const float* p, float* n) const
{
    // This bit of cruft causes bullets to bounce of buildings in the z direction
    if (fabs(p[2] - getPosition()[2]) < Epsilon)
    {
        n[0] = 0.0f;
        n[1] = 0.0f;
        n[2] = -1.0f;
    }
    else if (fabs(p[2] - (getPosition()[2] + getHeight())) < Epsilon)
    {
        n[0] = 0.0f;
        n[1] = 0.0f;
        n[2] = 1.0f;
    } // end cruftiness
    else
        getNormal(p, n);
}

bool            BaseBuilding::inCylinder(const float *p, float radius, float height) const
{
    return (p[2] < (getPosition()[2] + getHeight()))
           &&     ((p[2]+height) > getPosition()[2])
           &&     testRectCircle(getPosition(), getRotation(), getWidth(), getBreadth(), p, radius);
}

bool            BaseBuilding::inBox(const float *p, float _angle,
                                    float dx, float dy, float height) const
{
    return (p[2] < (getPosition()[2] + getHeight()))
           &&     ((p[2]+height) >= getPosition()[2])
           &&     testRectRect(getPosition(), getRotation(), getWidth(), getBreadth(),
                               p, _angle, dx, dy);
}

bool            BaseBuilding::inMovingBox(const float* oldP, float,
        const float *p, float _angle,
        float dx, float dy, float height) const
{
    float topBaseHeight = getPosition()[2] + getHeight();
    float higherZ;
    float lowerZ;
    // if a base is just the ground (z == 0 && height == 0) no collision
    // ground is already handled
    if (topBaseHeight <= 0.0)
        return false;
    if (oldP[2] > p[2])
    {
        higherZ = oldP[2];
        lowerZ  = p[2];
    }
    else
    {
        higherZ = p[2];
        lowerZ  = oldP[2];
    }
    if (lowerZ >= topBaseHeight)
        return false;
    if ((higherZ + height) < getPosition()[2])
        return false;
    return testRectRect(getPosition(), getRotation(), getWidth(), getBreadth(),
                        p, _angle, dx, dy);
}

bool            BaseBuilding::isCrossing(const float *p, float _angle,
        float dx, float dy, float height,
        float *plane) const
{
    // if not inside or contained, then not crossing
    if (!inBox(p, _angle, dx, dy, height) ||
            testRectInRect(getPosition(), getRotation(),
                           getWidth(), getBreadth(), p, _angle, dx, dy))
        return false;
    if (!plane) return true;

    // it's crossing -- choose which wall is being crossed (this
    // is a guestimate, should really do a careful test). Just
    // see which wall the point is closest to
    const float *p2 = getPosition();
    const float a2  = getRotation();
    const float c   = cosf(-a2), s = sinf(-a2);
    const float x   = c * (p[0] - p2[0]) - s * (p[1] - p2[1]);
    const float y   = c * (p[1] - p2[1]) - s * (p[0] - p2[0]);
    float pw[2];
    if (fabsf(fabsf(x) - getWidth()) < fabsf(fabsf(y) - getBreadth()))
    {
        plane[0] = ((x < 0.0) ? -cosf(a2) : cosf(a2));
        plane[1] = ((x < 0.0) ? -sinf(a2) : sinf(a2));
        pw[0] = p2[0] + getWidth() * plane[0];
        pw[1] = p2[1] + getWidth() * plane[1];
    }
    else
    {
        plane[0] = ((y < 0.0) ? sinf(a2) : -sinf(a2));
        plane[1] = ((y < 0.0) ? cosf(a2) : -cosf(a2));
        pw[0] = p2[0] + getBreadth() * plane[0];
        pw[1] = p2[1] + getBreadth() * plane[1];
    }

    // now finish off plane equation
    plane[2] = 0.0;
    plane[3] = -(plane[0] * pw[0] + plane[1] * pw[1]);
    return true;
}

bool            BaseBuilding::getHitNormal(const float *pos1, float azimuth1,
        const float *pos2, float azimuth2,
        float halfWidth, float halfBreadth, float,
        float *normal) const
{
    return Obstacle::getHitNormal(pos1, azimuth1, pos2, azimuth2, halfWidth, halfBreadth,
                                  getPosition(), getRotation(), getWidth(), getBreadth(),
                                  getHeight(), normal) >= 0.0f;
}

void            BaseBuilding::getCorner(int index, float *_pos) const
{
    const float *base = getPosition();
    const float c = cosf(getRotation());
    const float s = sinf(getRotation());
    const float w = getWidth();
    const float b = getBreadth();
    switch (index & 3)
    {
    case 0:
        _pos[0] = base[0] + c * w - s * b;
        _pos[1] = base[1] + s * w + c * b;
        break;
    case 1:
        _pos[0] = base[0] - c * w - s * b;
        _pos[1] = base[1] - s * w + c * b;
        break;
    case 2:
        _pos[0] = base[0] - c * w + s * b;
        _pos[1] = base[1] - s * w - c * b;
        break;
    case 3:
        _pos[0] = base[0] + c * w + s * b;
        _pos[1] = base[1] + s * w - c * b;
        break;
    }
    _pos[2] = base[2];
    if (index >= 4) _pos[2] += getHeight();
}

int BaseBuilding::getTeam() const
{
    return team;
}

bool            BaseBuilding::isFlatTop() const
{
    return true;
}


void* BaseBuilding::pack(void* buf) const
{
    buf = nboPackUShort(buf, (uint16_t) team);

    buf = nboPackVector(buf, pos);
    buf = nboPackFloat(buf, angle);
    buf = nboPackVector(buf, size);

    unsigned char stateByte = 0;
    stateByte |= isDriveThrough() ? _DRIVE_THRU : 0;
    stateByte |= isShootThrough() ? _SHOOT_THRU : 0;
    stateByte |= canRicochet()    ? _RICOCHET   : 0;
    buf = nboPackUByte(buf, stateByte);

    return buf;
}


const void* BaseBuilding::unpack(const void* buf)
{
    uint16_t shortTeam;
    buf = nboUnpackUShort(buf, shortTeam);
    team = (int)shortTeam;

    buf = nboUnpackVector(buf, pos);
    buf = nboUnpackFloat(buf, angle);
    buf = nboUnpackVector(buf, size);

    unsigned char stateByte;
    buf = nboUnpackUByte(buf, stateByte);
    driveThrough = (stateByte & _DRIVE_THRU) != 0;
    shootThrough = (stateByte & _SHOOT_THRU) != 0;
    ricochet     = (stateByte & _RICOCHET)   != 0;

    finalize();

    return buf;
}


int BaseBuilding::packSize() const
{
    int fullSize = 0;
    fullSize += sizeof(uint16_t); // team
    fullSize += sizeof(float[3]); // pos
    fullSize += sizeof(float);    // rotation
    fullSize += sizeof(float[3]); // size
    fullSize += sizeof(uint8_t);  // state bits
    return fullSize;
}


void BaseBuilding::print(std::ostream& out, const std::string& indent) const
{
    out << indent << "base" << std::endl;
    const float *myPos = getPosition();
    out << indent << "  position " << myPos[0] << " " << myPos[1] << " "
        << myPos[2] << std::endl;
    out << indent << "  size " << getWidth() << " " << getBreadth()
        << " " << getHeight() << std::endl;
    out << indent << "  rotation " << ((getRotation() * 180.0) / M_PI)
        << std::endl;
    out << indent << "  color " << getTeam() << std::endl;
    if (isPassable())
        out << indent << "  passable" << std::endl;
    else
    {
        if (isDriveThrough())
            out << indent << "  drivethrough" << std::endl;
        if (isShootThrough())
            out << indent << "  shootthrough" << std::endl;
    }
    if (canRicochet())
        out << indent << "  ricochet" << std::endl;
    out << indent << "end" << std::endl;
    return;
}


static void outputFloat(std::ostream& out, float value)
{
    char buffer[32];
    snprintf(buffer, 30, " %.8f", value);
    out << buffer;
    return;
}

void BaseBuilding::printOBJ(std::ostream& out, const std::string& UNUSED(indent)) const
{
    int i;
    float verts[8][3] =
    {
        {-1.0f, -1.0f, 0.0f},
        {+1.0f, -1.0f, 0.0f},
        {+1.0f, +1.0f, 0.0f},
        {-1.0f, +1.0f, 0.0f},
        {-1.0f, -1.0f, 1.0f},
        {+1.0f, -1.0f, 1.0f},
        {+1.0f, +1.0f, 1.0f},
        {-1.0f, +1.0f, 1.0f}
    };
    float norms[6][3] =
    {
        {0.0f, -1.0f, 0.0f}, {+1.0f, 0.0f, 0.0f},
        {0.0f, +1.0f, 0.0f}, {-1.0f, 0.0f, 0.0f},
        {0.0f, 0.0f, -1.0f}, {0.0f, 0.0f, +1.0f}
    };
    float txcds[4][2] =
    {
        {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f}, {0.0f, 1.0f}
    };
    MeshTransform xform;
    const float degrees = getRotation() * (float)(180.0 / M_PI);
    const float zAxis[3] = {0.0f, 0.0f, +1.0f};
    xform.addScale(getSize());
    xform.addSpin(degrees, zAxis);
    xform.addShift(getPosition());
    xform.finalize();
    MeshTransform::Tool xtool(xform);
    for (i = 0; i < 8; i++)
        xtool.modifyVertex(verts[i]);
    for (i = 0; i < 6; i++)
        xtool.modifyNormal(norms[i]);

    out << "# OBJ - start base" << std::endl;
    out << "o bzbase_team" << team << "_" << getObjCounter() << std::endl;

    for (i = 0; i < 8; i++)
    {
        out << "v";
        outputFloat(out, verts[i][0]);
        outputFloat(out, verts[i][1]);
        outputFloat(out, verts[i][2]);
        out << std::endl;
    }
    for (i = 0; i < 4; i++)
    {
        out << "vt";
        outputFloat(out, txcds[i][0]);
        outputFloat(out, txcds[i][1]);
        out << std::endl;
    }
    for (i = 0; i < 6; i++)
    {
        out << "vn";
        outputFloat(out, norms[i][0]);
        outputFloat(out, norms[i][1]);
        outputFloat(out, norms[i][2]);
        out << std::endl;
    }
    out << "usemtl basetop_team" << team << std::endl;
    out << "f -5/-4/-2 -6/-3/-2 -7/-2/-2 -8/-1/-2" << std::endl;
    out << "f -4/-4/-1 -3/-3/-1 -2/-2/-1 -1/-1/-1" << std::endl;
    out << "usemtl basewall_team" << team << std::endl;
    out << "f -8/-4/-6 -7/-3/-6 -3/-2/-6 -4/-1/-6" << std::endl;
    out << "f -7/-4/-5 -6/-3/-5 -2/-2/-5 -3/-1/-5" << std::endl;
    out << "f -6/-4/-4 -5/-3/-4 -1/-2/-4 -2/-1/-4" << std::endl;
    out << "f -5/-4/-3 -8/-3/-3 -4/-2/-3 -1/-1/-3" << std::endl;

    out << std::endl;

    incObjCounter();

    return;
}


// Local Variables: ***
// mode: C++ ***
// tab-width: 4 ***
// c-basic-offset: 4 ***
// indent-tabs-mode: nil ***
// End: ***
// ex: shiftwidth=4 tabstop=4