| 1 |
#include <cstdlib> |
| 2 |
|
| 3 |
#include <vector> |
| 4 |
|
| 5 |
using namespace std; |
| 6 |
|
| 7 |
#include "opengl.h" |
| 8 |
|
| 9 |
#include "oct.h" |
| 10 |
#include "view.h" |
| 11 |
#include "entity.h" |
| 12 |
|
| 13 |
octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT); |
| 14 |
|
| 15 |
octant::octant (octant *parent, const sector &orig, uoffs extent) |
| 16 |
: parent(parent), orig(orig), extent(extent) |
| 17 |
{ |
| 18 |
for (fill = 8; fill--; ) |
| 19 |
sub[fill] = 0; |
| 20 |
} |
| 21 |
|
| 22 |
octant::~octant () |
| 23 |
{ |
| 24 |
for (fill = 8; fill--; ) |
| 25 |
delete sub[fill]; |
| 26 |
} |
| 27 |
|
| 28 |
static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b) |
| 29 |
{ |
| 30 |
ea /= 2; |
| 31 |
|
| 32 |
sector center_1 = o1 + ea; |
| 33 |
sector size_2 = b - a; |
| 34 |
sector center_2 = a + size_2 / 2; |
| 35 |
|
| 36 |
return abs (center_1 - center_2) <= ea + size_2; |
| 37 |
} |
| 38 |
|
| 39 |
void octant::add (entity *e) |
| 40 |
{ |
| 41 |
const sector &a = e->a; |
| 42 |
const sector &b = e->b; |
| 43 |
|
| 44 |
if (overlap (orig, extent, a, b)) |
| 45 |
{ |
| 46 |
uoffs extent2 = extent / 2; |
| 47 |
uoffs size = max (abs (b - a)); |
| 48 |
|
| 49 |
if (size > extent2 || !extent2) |
| 50 |
{ |
| 51 |
push_back (e); |
| 52 |
e->o.push_back (this); |
| 53 |
return; |
| 54 |
} |
| 55 |
|
| 56 |
for (int i = 8; i--; ) |
| 57 |
{ |
| 58 |
sector s = orig; |
| 59 |
s.offset (i, extent2); |
| 60 |
|
| 61 |
if (overlap (s, extent2, a, b)) |
| 62 |
{ |
| 63 |
if (!sub[i]) |
| 64 |
sub[i] = new octant (this, s, extent2); |
| 65 |
|
| 66 |
sub[i]->add (e); |
| 67 |
} |
| 68 |
} |
| 69 |
} |
| 70 |
} |
| 71 |
|
| 72 |
void octant::remove (entity *e) |
| 73 |
{ |
| 74 |
} |
| 75 |
|
| 76 |
void octant::detect_visibility (view &ctx) |
| 77 |
{ |
| 78 |
visibility_state &vs = ctx.vismap[this]; |
| 79 |
|
| 80 |
GLfloat extent2 = 0.5F * (GLfloat)extent; |
| 81 |
point center = point (orig + (extent >> 1) - ctx.orig); |
| 82 |
if (extent & 1) center = center + 0.5F; |
| 83 |
GLfloat rad = ctx.diagfact * extent2; |
| 84 |
|
| 85 |
if (vs.generation + 1 != ctx.generation) |
| 86 |
vs.visibility = visibility_state::UNKNOWN; |
| 87 |
|
| 88 |
vs.generation = ctx.generation; |
| 89 |
|
| 90 |
if (orig <= ctx.orig && ctx.orig <= orig + extent) |
| 91 |
vs.visibility = visibility_state::PARTIAL; |
| 92 |
else |
| 93 |
{ |
| 94 |
if (ctx.frustum.t.distance (center) < -rad) return; |
| 95 |
if (ctx.frustum.b.distance (center) < -rad) return; |
| 96 |
if (ctx.frustum.l.distance (center) < -rad) return; |
| 97 |
if (ctx.frustum.r.distance (center) < -rad) return; |
| 98 |
if (ctx.frustum.n.distance (center) < -rad) return; |
| 99 |
|
| 100 |
GLfloat fd = ctx.frustum.f.distance (center); |
| 101 |
|
| 102 |
if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) |
| 103 |
return; |
| 104 |
} |
| 105 |
|
| 106 |
if (vs.visibility == visibility_state::OCCLUDED |
| 107 |
|| vs.visibility == visibility_state::UNKNOWN) |
| 108 |
{ |
| 109 |
ctx.farlist.push_back (this); |
| 110 |
return; |
| 111 |
} |
| 112 |
|
| 113 |
#if 0 |
| 114 |
if (vs.visibility == visibility_state::UNKNOWN) |
| 115 |
vs.visibility = visibility_state::FULL; |
| 116 |
#endif |
| 117 |
|
| 118 |
GLfloat z = ctx.z_near + ctx.frustum.n.distance (center) + rad; |
| 119 |
|
| 120 |
if (vs.visibility == visibility_state::FULL) |
| 121 |
ctx.nc_far = max (ctx.nc_far, z); |
| 122 |
|
| 123 |
if (size () |
| 124 |
&& (vs.visibility == visibility_state::PARTIAL |
| 125 |
|| vs.visibility == visibility_state::FULL)) |
| 126 |
{ |
| 127 |
ctx.nz_far = max (ctx.nz_far, z); |
| 128 |
ctx.vislist.push_back (this); |
| 129 |
} |
| 130 |
|
| 131 |
// node to start with |
| 132 |
unsigned char si = ctx.d.x < 0 ? 1 : 0 |
| 133 |
| ctx.d.y < 0 ? 2 : 0 |
| 134 |
| ctx.d.z < 0 ? 4 : 0; |
| 135 |
|
| 136 |
// bit-toggle to find next child for front-to-back order |
| 137 |
static unsigned char next[8] |
| 138 |
= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7 }; |
| 139 |
|
| 140 |
for (int i = 0; i < 8; i++) |
| 141 |
{ |
| 142 |
si ^= next[i]; |
| 143 |
|
| 144 |
if (sub[si]) |
| 145 |
sub[si]->detect_visibility (ctx); |
| 146 |
} |
| 147 |
} |
| 148 |
|
| 149 |
void octant::display (view &ctx) |
| 150 |
{ |
| 151 |
#if 0 |
| 152 |
glBegin (GL_LINES); |
| 153 |
sector s = orig - ctx.orig; |
| 154 |
vec3 clr(0, 0.8, 0); |
| 155 |
glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr); |
| 156 |
|
| 157 |
for (int i = 8; i--; ) |
| 158 |
for (int ji = 3; ji--; ) |
| 159 |
{ |
| 160 |
int j = i | (1 << ji); |
| 161 |
if (i != j) |
| 162 |
{ |
| 163 |
glVertex3i (s.x + !!(i & 1) * extent, |
| 164 |
s.y + !!(i & 2) * extent, |
| 165 |
s.z + !!(i & 4) * extent); |
| 166 |
glVertex3i (s.x + !!(j & 1) * extent, |
| 167 |
s.y + !!(j & 2) * extent, |
| 168 |
s.z + !!(j & 4) * extent); |
| 169 |
} |
| 170 |
} |
| 171 |
|
| 172 |
glEnd (); |
| 173 |
#endif |
| 174 |
|
| 175 |
for (iterator i = end (); i != begin (); ) |
| 176 |
(*--i)->display (ctx); |
| 177 |
} |
| 178 |
|
| 179 |
void octant::draw_bbox (view &ctx) |
| 180 |
{ |
| 181 |
sector s = orig - ctx.orig; |
| 182 |
|
| 183 |
gl::draw_box (ctx, s, s + extent); |
| 184 |
} |
| 185 |
|
| 186 |
void octant::event (occ_query &ev) |
| 187 |
{ |
| 188 |
visibility_state &vs = ev.v.vismap[this]; |
| 189 |
|
| 190 |
vs.last = timer.now; |
| 191 |
vs.visibility = ev.r <= 0 |
| 192 |
? visibility_state::OCCLUDED |
| 193 |
: visibility_state::FULL; |
| 194 |
} |
| 195 |
|
