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#include "stdafx.h"
#include "ViewportCuller.h"
#include "..\Minecraft.World\Mth.h"
ViewportCuller::Face::Face(double x, double y, double z, float yRot, float xRot)
{
this->xc = x;
this->yc = y;
this->zc = z;
xd = Mth::sin(yRot / 180 * PI) * Mth::cos(xRot / 180 * PI);
zd = -Mth::cos(yRot / 180 * PI) * Mth::cos(xRot / 180 * PI);
yd = -Mth::sin(xRot / 180 * PI);
cullOffs = xc*xd+yc*yd+zc*zd;
}
bool ViewportCuller::Face::inFront(double x, double y, double z, double r)
{
return x*xd+y*yd+z*zd>cullOffs-r;
}
bool ViewportCuller::Face::inFront(double x0, double y0, double z0, double x1, double y1, double z1)
{
if (
x0*xd+y0*yd+z0*zd>cullOffs ||
x1*xd+y0*yd+z0*zd>cullOffs ||
x0*xd+y1*yd+z0*zd>cullOffs ||
x1*xd+y1*yd+z0*zd>cullOffs ||
x0*xd+y0*yd+z1*zd>cullOffs ||
x1*xd+y0*yd+z1*zd>cullOffs ||
x0*xd+y1*yd+z1*zd>cullOffs ||
x1*xd+y1*yd+z1*zd>cullOffs
) return true;
return false;
}
bool ViewportCuller::Face::fullyInFront(double x0, double y0, double z0, double x1, double y1, double z1)
{
if ( x0*xd+y0*yd+z0*zd<cullOffs ||
x1*xd+y0*yd+z0*zd<cullOffs ||
x0*xd+y1*yd+z0*zd<cullOffs ||
x1*xd+y1*yd+z0*zd<cullOffs ||
x0*xd+y0*yd+z1*zd<cullOffs ||
x1*xd+y0*yd+z1*zd<cullOffs ||
x0*xd+y1*yd+z1*zd<cullOffs ||
x1*xd+y1*yd+z1*zd<cullOffs
) return false;
return true;
}
ViewportCuller::ViewportCuller(shared_ptr<LivingEntity> mob, double fogDistance, float a)
{
float yRot = mob->yRotO+(mob->yRot-mob->yRotO)*a;
float xRot = mob->xRotO+(mob->xRot-mob->xRotO)*a;
double x = mob->xOld+(mob->x-mob->xOld)*a;
double y = mob->yOld+(mob->y-mob->yOld)*a;
double z = mob->zOld+(mob->z-mob->zOld)*a;
double xd = Mth::sin(yRot / 180 * PI) * Mth::cos(xRot / 180 * PI);
double zd = -Mth::cos(yRot / 180 * PI) * Mth::cos(xRot / 180 * PI);
double yd = -Mth::sin(xRot / 180 * PI);
float xFov = 30;
float yFov = 45;
faces[0] = Face(x, y, z, yRot, xRot);
faces[1] = Face(x, y, z, yRot+xFov, xRot);
faces[2] = Face(x, y, z, yRot-xFov, xRot);
faces[3] = Face(x, y, z, yRot, xRot+yFov);
faces[4] = Face(x, y, z, yRot, xRot-yFov);
faces[5] = Face(x+xd*fogDistance, y+yd*fogDistance, z+zd*fogDistance, yRot+180, -xRot);
}
bool ViewportCuller::isVisible(AABB bb)
{
return cubeInFrustum(bb.x0, bb.y0, bb.z0, bb.x1, bb.y1, bb.z1);
}
bool ViewportCuller::cubeInFrustum(double x0, double y0, double z0, double x1, double y1, double z1)
{
x0-=xOff;
y0-=yOff;
z0-=zOff;
x1-=xOff;
y1-=yOff;
z1-=zOff;
double xd = (x1-x0)/2.0f;
double yd = (y1-y0)/2.0f;
double zd = (z1-z0)/2.0f;
double xc = x0+xd;
double yc = y0+yd;
double zc = z0+zd;
double r = _max(xd, yd, zd)*1.5f;
if (!faces[0].inFront(xc, yc, zc, r)) return false;
if (!faces[1].inFront(xc, yc, zc, r)) return false;
if (!faces[2].inFront(xc, yc, zc, r)) return false;
if (!faces[3].inFront(xc, yc, zc, r)) return false;
if (!faces[4].inFront(xc, yc, zc, r)) return false;
if (!faces[5].inFront(xc, yc, zc, r)) return false;
if (!faces[0].inFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[1].inFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[2].inFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[3].inFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[4].inFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[5].inFront(x0, y0, z0, x1, y1, z1)) return false;
return true;
}
bool ViewportCuller::cubeFullyInFrustum(double x0, double y0, double z0, double x1, double y1, double z1)
{
x0-=xOff;
y0-=yOff;
z0-=zOff;
x1-=xOff;
y1-=yOff;
z1-=zOff;
double xd = (x1-x0)/2.0f;
double yd = (y1-y0)/2.0f;
double zd = (z1-z0)/2.0f;
double xc = x0+xd;
double yc = y0+yd;
double zc = z0+zd;
double r = _max(xd, yd, zd)*1.5f;
if (!faces[0].inFront(xc, yc, zc, r)) return false;
if (!faces[1].inFront(xc, yc, zc, r)) return false;
if (!faces[2].inFront(xc, yc, zc, r)) return false;
if (!faces[3].inFront(xc, yc, zc, r)) return false;
if (!faces[4].inFront(xc, yc, zc, r)) return false;
if (!faces[5].inFront(xc, yc, zc, r)) return false;
if (!faces[0].fullyInFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[1].fullyInFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[2].fullyInFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[3].fullyInFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[4].fullyInFront(x0, y0, z0, x1, y1, z1)) return false;
if (!faces[5].fullyInFront(x0, y0, z0, x1, y1, z1)) return false;
return true;
}
double ViewportCuller::_max(double a, double b, double c)
{
return (a>b?a>c?c:a:b>c?b:c);
}
void ViewportCuller::prepare(double xOff, double yOff, double zOff)
{
this->xOff = xOff;
this->yOff = yOff;
this->zOff = zOff;
}
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