| 1 |
#include <cstdlib> |
| 2 |
|
| 3 |
#include <vector> |
| 4 |
|
| 5 |
using namespace std; |
| 6 |
|
| 7 |
#define GL_GLEXT_PROTOTYPES |
| 8 |
#include <GL/gl.h> |
| 9 |
#include <GL/glext.h> |
| 10 |
|
| 11 |
#include "oct.h" |
| 12 |
#include "view.h" |
| 13 |
#include "entity.h" |
| 14 |
|
| 15 |
vector<GLuint> occ_query_objects; |
| 16 |
|
| 17 |
static GLuint begin_occ_query () |
| 18 |
{ |
| 19 |
GLuint id; |
| 20 |
|
| 21 |
if (occ_query_objects.size ()) |
| 22 |
{ |
| 23 |
id = *(occ_query_objects.end () - 1); |
| 24 |
occ_query_objects.pop_back (); |
| 25 |
} |
| 26 |
else |
| 27 |
glGenQueriesARB (1, &id); |
| 28 |
|
| 29 |
glBeginQueryARB (GL_SAMPLES_PASSED, id); |
| 30 |
return id; |
| 31 |
} |
| 32 |
|
| 33 |
#define end_occ_query() glEndQueryARB (GL_SAMPLES_PASSED) |
| 34 |
|
| 35 |
GLuint occ_query_result (GLuint id) |
| 36 |
{ |
| 37 |
GLuint count; |
| 38 |
|
| 39 |
glGetQueryObjectuivARB (id, GL_QUERY_RESULT, &count); |
| 40 |
occ_query_objects.push_back (id); |
| 41 |
|
| 42 |
return count; |
| 43 |
} |
| 44 |
|
| 45 |
octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT); |
| 46 |
|
| 47 |
octant::octant (octant *parent, const sector &orig, uoffs extent) |
| 48 |
: parent(parent), orig(orig), extent(extent) |
| 49 |
{ |
| 50 |
for (fill = 8; fill--; ) |
| 51 |
sub[fill] = 0; |
| 52 |
} |
| 53 |
|
| 54 |
octant::~octant () |
| 55 |
{ |
| 56 |
for (fill = 8; fill--; ) |
| 57 |
delete sub[fill]; |
| 58 |
} |
| 59 |
|
| 60 |
static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b) |
| 61 |
{ |
| 62 |
ea /= 2; |
| 63 |
|
| 64 |
sector center_1 = o1 + ea; |
| 65 |
sector size_2 = b - a; |
| 66 |
sector center_2 = a + size_2 / 2; |
| 67 |
|
| 68 |
return abs (center_1 - center_2) <= ea + size_2; |
| 69 |
} |
| 70 |
|
| 71 |
void octant::add (entity *e) |
| 72 |
{ |
| 73 |
const sector &a = e->a; |
| 74 |
const sector &b = e->b; |
| 75 |
|
| 76 |
if (overlap (orig, extent, a, b)) |
| 77 |
{ |
| 78 |
uoffs extent2 = extent / 2; |
| 79 |
uoffs size = max (abs (b - a)); |
| 80 |
|
| 81 |
if (size > extent2 || !extent2) |
| 82 |
{ |
| 83 |
push_back (e); |
| 84 |
e->o.push_back (this); |
| 85 |
return; |
| 86 |
} |
| 87 |
|
| 88 |
for (int i = 8; i--; ) |
| 89 |
{ |
| 90 |
sector s = orig; |
| 91 |
s.offset (i, extent2); |
| 92 |
|
| 93 |
if (overlap (s, extent2, a, b)) |
| 94 |
{ |
| 95 |
if (!sub[i]) |
| 96 |
sub[i] = new octant (this, s, extent2); |
| 97 |
|
| 98 |
sub[i]->add (e); |
| 99 |
} |
| 100 |
} |
| 101 |
} |
| 102 |
} |
| 103 |
|
| 104 |
void octant::remove (entity *e) |
| 105 |
{ |
| 106 |
} |
| 107 |
|
| 108 |
void octant::detect_visibility (view &ctx) |
| 109 |
{ |
| 110 |
visibility_state &vs = ctx.vismap[this]; |
| 111 |
|
| 112 |
if (vs.generation != ctx.generation) |
| 113 |
vs.visibility = visibility_state::UNKNOWN; |
| 114 |
|
| 115 |
if (orig <= ctx.orig && ctx.orig <= orig + extent) |
| 116 |
{ |
| 117 |
vs.visibility = visibility_state::PARTIAL; |
| 118 |
vs.generation = ctx.generation; |
| 119 |
} |
| 120 |
else |
| 121 |
{ |
| 122 |
sector center_s (orig + extent / 2 - ctx.orig); |
| 123 |
point center (center_s.x, center_s.y, center_s.z); |
| 124 |
|
| 125 |
GLfloat dia = (2. * sqrtf (3))*(GLfloat)extent; |
| 126 |
|
| 127 |
if (ctx.frustum.t.distance (center) < -dia) return; |
| 128 |
if (ctx.frustum.b.distance (center) < -dia) return; |
| 129 |
if (ctx.frustum.l.distance (center) < -dia) return; |
| 130 |
if (ctx.frustum.r.distance (center) < -dia) return; |
| 131 |
if (ctx.frustum.n.distance (center) < -dia) return; |
| 132 |
|
| 133 |
GLfloat fd = ctx.frustum.f.distance (center); |
| 134 |
|
| 135 |
if (fd < -dia) |
| 136 |
{ |
| 137 |
if (fd < -dia * 2) |
| 138 |
return; |
| 139 |
|
| 140 |
// cull, but do check for potential visibility |
| 141 |
if (size ()) |
| 142 |
{ |
| 143 |
ctx.farlist.push_back (this); |
| 144 |
return; |
| 145 |
} |
| 146 |
} |
| 147 |
} |
| 148 |
|
| 149 |
if (size ()) |
| 150 |
ctx.vislist.push_back (this); |
| 151 |
|
| 152 |
// node to start with |
| 153 |
unsigned char si = ctx.d.x < 0 ? 1 : 0 |
| 154 |
| ctx.d.y < 0 ? 2 : 0 |
| 155 |
| ctx.d.z < 0 ? 4 : 0; |
| 156 |
|
| 157 |
// bit-toggle to find next child for front-to-back order |
| 158 |
static unsigned char next[8] |
| 159 |
= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7 }; |
| 160 |
|
| 161 |
for (int i = 0; i < 8; i++) |
| 162 |
{ |
| 163 |
si ^= next[i]; |
| 164 |
|
| 165 |
if (sub[si]) |
| 166 |
sub[si]->detect_visibility (ctx); |
| 167 |
} |
| 168 |
|
| 169 |
vs.generation = ctx.generation; |
| 170 |
} |
| 171 |
|
| 172 |
void octant::display (view &ctx) |
| 173 |
{ |
| 174 |
#if 0 |
| 175 |
glBegin (GL_LINES); |
| 176 |
sector s = orig - ctx.orig; |
| 177 |
vec3 clr(0, 0.8, 0); |
| 178 |
glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr); |
| 179 |
|
| 180 |
for (int i = 8; i--; ) |
| 181 |
for (int ji = 3; ji--; ) |
| 182 |
{ |
| 183 |
int j = i | (1 << ji); |
| 184 |
if (i != j) |
| 185 |
{ |
| 186 |
glVertex3i (s.x + !!(i & 1) * extent, |
| 187 |
s.y + !!(i & 2) * extent, |
| 188 |
s.z + !!(i & 4) * extent); |
| 189 |
glVertex3i (s.x + !!(j & 1) * extent, |
| 190 |
s.y + !!(j & 2) * extent, |
| 191 |
s.z + !!(j & 4) * extent); |
| 192 |
} |
| 193 |
} |
| 194 |
|
| 195 |
glEnd (); |
| 196 |
glDisable(GL_COLOR_MATERIAL); |
| 197 |
#endif |
| 198 |
|
| 199 |
for (iterator i = end (); i != begin (); ) |
| 200 |
(*--i)->display (ctx); |
| 201 |
} |
| 202 |
|
| 203 |
void |
| 204 |
octant::draw_bbox (view &ctx) |
| 205 |
{ |
| 206 |
sector s = orig - ctx.orig; |
| 207 |
int i; |
| 208 |
GLint verts[4 * 6] = { |
| 209 |
0x00, 0x40, 0x60, 0x20, // -x |
| 210 |
0x10, 0x30, 0x70, 0x50, // +x |
| 211 |
0x00, 0x10, 0x50, 0x40, // -y |
| 212 |
0x70, 0x30, 0x20, 0x60, // +y |
| 213 |
0x00, 0x20, 0x30, 0x10, // -z |
| 214 |
0x40, 0x50, 0x70, 0x60, // +z |
| 215 |
}; |
| 216 |
|
| 217 |
GLfloat cube[8][3] = |
| 218 |
{ |
| 219 |
{ s.x , s.y , s.z }, |
| 220 |
{ s.x + (soffs)extent, s.y , s.z }, |
| 221 |
{ s.x , s.y + (soffs)extent, s.z }, |
| 222 |
{ s.x + (soffs)extent, s.y + (soffs)extent, s.z }, |
| 223 |
{ s.x , s.y , s.z + (soffs)extent }, |
| 224 |
{ s.x + (soffs)extent, s.y , s.z + (soffs)extent }, |
| 225 |
{ s.x , s.y + (soffs)extent, s.z + (soffs)extent }, |
| 226 |
{ s.x + (soffs)extent, s.y + (soffs)extent, s.z + (soffs)extent }, |
| 227 |
}; |
| 228 |
|
| 229 |
glBegin (GL_QUADS); |
| 230 |
|
| 231 |
for (i = 0; i < 4 * 6; i++) |
| 232 |
glVertex3fv (cube [verts [i] >> 4]); |
| 233 |
|
| 234 |
glEnd (); |
| 235 |
} |
| 236 |
|
| 237 |
|
