fixed_t M_LengthVec2Fixed(const v2fixed_t *v)
{
double fx = FIXED2DOUBLE(v->x);
double fy = FIXED2DOUBLE(v->y);
return DOUBLE2FIXED(sqrt(fx * fx + fy * fy));
}
fixed_t M_LengthVec3Fixed(const v3fixed_t *v)
{
double fx = FIXED2DOUBLE(v->x);
double fy = FIXED2DOUBLE(v->y);
double fz = FIXED2DOUBLE(v->z);
return DOUBLE2FIXED(sqrt(fx * fx + fy * fy + fz * fz));
}
//
// R_MapSlopedPlane
//
// Calculates the vectors a, b, & c, which are used to texture map a sloped
// plane.
//
// Based in part on R_MapSlope() and R_SlopeLights() from Eternity Engine,
// written by SoM/Quasar
//
void R_MapSlopedPlane(int y, int x1, int x2)
{
int len = x2 - x1 + 1;
if (len <= 0)
return;
// center of the view plane
v3double_t s;
s.x = x1 - centerx;
s.y = y - centery + 1;
s.z = FIXED2DOUBLE(FocalLengthX);
ds_iu = M_DotProductVec3(&s, &a) * flatwidth;
ds_iv = M_DotProductVec3(&s, &b) * flatheight;
ds_id = M_DotProductVec3(&s, &c);
ds_iustep = a.x * flatwidth;
ds_ivstep = b.x * flatheight;
ds_idstep = c.x;
// From R_SlopeLights, Eternity Engine
double map1, map2;
map1 = 256.0 - (shade - plight * ds_id);
if (len > 1)
{
double id = ds_id + ds_idstep * (x2 - x1);
map2 = 256.0 - (shade - plight * id);
}
else
map2 = map1;
if (fixedlightlev)
for (int i = 0; i < len; i++)
slopelighting[i] = basecolormap + fixedlightlev;
else if (fixedcolormap)
for (int i = 0; i < len; i++)
slopelighting[i] = fixedcolormap;
else
{
fixed_t mapstart = FLOAT2FIXED((256.0 - map1) / 256.0 * NUMCOLORMAPS);
fixed_t mapend = FLOAT2FIXED((256.0 - map2) / 256.0 * NUMCOLORMAPS);
fixed_t map = mapstart;
fixed_t step = 0;
if (len > 1)
step = (mapend - mapstart) / (len - 1);
for (int i = 0; i < len; i++)
{
int index = (int)(map >> FRACBITS) + 1;
index -= (foggy ? 0 : extralight << 2);
if (index < 0)
slopelighting[i] = basecolormap;
else if (index >= NUMCOLORMAPS)
slopelighting[i] = basecolormap + 256 * (NUMCOLORMAPS - 1);
else
slopelighting[i] = basecolormap + 256 * index;
map += step;
}
}
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanslopefunc();
}
void M_SetVec3(v3double_t *dest, fixed_t x, fixed_t y, fixed_t z)
{
dest->x = FIXED2DOUBLE(x);
dest->y = FIXED2DOUBLE(y);
dest->z = FIXED2DOUBLE(z);
}
void M_ActorMomentumToVec3(v3double_t *dest, const AActor *thing)
{
dest->x = FIXED2DOUBLE(thing->momx);
dest->y = FIXED2DOUBLE(thing->momy);
dest->z = FIXED2DOUBLE(thing->momz);
}
void M_ActorPositionToVec3(v3double_t *dest, const AActor *thing)
{
dest->x = FIXED2DOUBLE(thing->x);
dest->y = FIXED2DOUBLE(thing->y);
dest->z = FIXED2DOUBLE(thing->z);
}
int main()
{
fixed a1 = INT2FIXED(100),a2 = INT2FIXED(3);
printf("%f",FIXED2DOUBLE(FDIV(a1,a2)));
}
