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#include <cstdlib> |
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|
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#include <vector> |
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|
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using namespace std; |
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|
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#include "opengl.h" |
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|
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#include "oct.h" |
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#include "view.h" |
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#include "entity.h" |
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#include "material.h" //DEBUG |
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|
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enum visibility_state { |
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PARTIAL, // surrounding the viewpoint |
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FULL, // in frustum |
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OCCLUDED, // in frustom, but occluded |
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}; |
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|
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struct evis { |
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entity *e; |
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visibility_state state; |
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double last; // time of last check |
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|
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void clear () |
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{ |
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last = 0.; |
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state = FULL; |
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} |
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|
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evis () |
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{ |
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clear (); |
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} |
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}; |
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|
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struct oct_visibility : visibility_base |
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{ |
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vector<evis> vismap; |
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|
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visibility_state state; |
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bool vis; |
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|
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evis &get_visibility (int i, entity *e) |
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{ |
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evis &evs = vismap [i]; |
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|
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if (evs.e != e) |
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{ |
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evs.clear (); |
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evs.e = e; |
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} |
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|
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return evs; |
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} |
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|
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oct_visibility (octant &oct) |
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: state (FULL), vis (true) |
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{ |
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} |
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}; |
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|
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octant world(0, sector (0, 0, 0), MAXEXTENT); |
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|
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octant::octant (octant *parent, const sector &orig, uoffs extent) |
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: parent(parent) |
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, orig(orig) |
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, extent(extent) |
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{ |
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for (fill = 8; fill--; ) |
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sub[fill] = 0; |
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} |
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|
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visibility_base *octant::new_visibility () |
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{ |
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return new oct_visibility (*this); |
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} |
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|
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void octant::clear_visibility (visibility_base *vs) |
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{ |
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((oct_visibility *)vs)->vismap.clear (); |
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((oct_visibility *)vs)->state = FULL; |
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} |
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|
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octant::~octant () |
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{ |
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for (fill = 8; fill--; ) |
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delete sub[fill]; |
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} |
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|
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static bool overlap (const sector &orig, uoffs extent, const sector &a, const sector &b) |
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{ |
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sector size = (b - a + 1) >> 1; |
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sector center = a + size; |
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|
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return abs (orig - center) <= extent + size; |
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} |
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|
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static sector offset (const sector &s, int subindex, uoffs extent) |
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{ |
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return sector ( |
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s.x + (subindex & 1 ? extent : -extent), |
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s.y + (subindex & 2 ? extent : -extent), |
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s.z + (subindex & 4 ? extent : -extent) |
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); |
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} |
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|
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void octant::add (entity *e) |
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{ |
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const sector &a = e->a; |
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const sector &b = e->b; |
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|
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uoffs size = max (abs (b - a)); |
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|
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if (size >= extent >> 4) |
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{ |
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if (overlap (orig, extent, a, b)) |
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{ |
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push_back (e); |
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e->o.push_back (this); |
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} |
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} |
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else |
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{ |
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uoffs extent2 = extent >> 1; |
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|
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for (int i = 8; i--; ) |
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{ |
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sector s = offset (orig, i, extent2); |
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|
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if (overlap (s, extent2, a, b)) |
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{ |
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if (!sub[i]) |
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{ |
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sub[i] = new octant (this, s, extent2); |
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fill++; |
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} |
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|
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sub[i]->add (e); |
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} |
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} |
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} |
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} |
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|
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void octant::remove (entity *e) |
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{ |
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} |
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|
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bool octant::detect_visibility (view &ctx) //, bool fully_visible) |
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{ |
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sector centeri = orig - ctx.orig; |
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point centerf = point (centeri); |
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|
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GLfloat rad = ctx.diagfact * extent; |
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|
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if (!overlap (ctx.frustum.c, sphere (centerf, rad))) |
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return false; |
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|
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oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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|
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if (max (centeri) < extent) |
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vs.state = PARTIAL; |
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else |
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{ |
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if (distance (ctx.frustum.t, centerf) < -rad) return false; |
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if (distance (ctx.frustum.b, centerf) < -rad) return false; |
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if (distance (ctx.frustum.l, centerf) < -rad) return false; |
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if (distance (ctx.frustum.r, centerf) < -rad) return false; |
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if (distance (ctx.frustum.n, centerf) < -rad) return false; |
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} |
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|
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#if 0 |
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GLfloat fd = distance (ctx.frustum.f, centerf); |
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|
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if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) |
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return false; |
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#endif |
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|
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// very important, optimize? |
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GLfloat z = length (ctx.p - centerf) + rad; |
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if (z < 0.F || ctx.perspfact * extent / z < 10.) // very crude "too small to see" check |
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return false; |
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|
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#if 0 |
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if (vs.state == PARTIAL || vs.state == FULL) |
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ctx.nc_far = max (ctx.nc_far, z); |
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#endif |
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|
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if (vs.state == OCCLUDED) |
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{ |
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ctx.postdepthlist.push_back (this); |
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|
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return false; |
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} |
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|
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//bool visible = size () && vs.state != OCCLUDED; |
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bool visible = false; |
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|
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// node to start with |
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unsigned char si = centeri.x > 0 ? 1 : 0 |
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| centeri.y > 0 ? 2 : 0 |
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| centeri.z > 0 ? 4 : 0; |
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|
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// bit-toggle to find next child for front-to-back order |
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static unsigned char toggle[8+1] |
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= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 }; |
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|
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unsigned char *next = toggle; |
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do |
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{ |
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si ^= *next; |
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|
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if (sub[si]) |
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visible = visible | sub[si]->detect_visibility (ctx); |
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} |
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while (*++next); |
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|
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if (visible) |
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{ |
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if (size ()) |
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{ |
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ctx.postdepthlist.push_back (this); |
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ctx.vislist.push_back (this); |
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} |
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|
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vs.state = FULL; |
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|
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return true; |
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} |
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else if (vs.state == OCCLUDED) |
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{ |
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ctx.postdepthlist.push_back (this); |
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|
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return false; |
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} |
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else if (size()) |
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{ |
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ctx.postdepthlist.push_back (this); |
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ctx.vislist.push_back (this); |
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|
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return true; |
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} |
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else |
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{ |
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return vs.state != PARTIAL; |
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} |
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} |
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|
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void octant::draw_depth (view &ctx) |
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{ |
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oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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|
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vs.vismap.resize (size ()); |
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|
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if (vs.state == OCCLUDED) |
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return; |
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|
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for (int i = 0; i < size (); ++i) |
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{ |
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entity *e = (*this)[i]; |
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const evis &evs = vs.get_visibility (i, e); |
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|
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if (evs.state != OCCLUDED) |
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{ |
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if (!ctx.may_draw (e)) |
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continue; |
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|
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sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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GLfloat z = length (vec3 (center)); |
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ctx.pixfact = ctx.perspfact / z; |
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|
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ctx.nz_far = max (ctx.nz_far, z + extent); |
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ctx.nz_near = min (ctx.nz_near, z - extent); |
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|
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e->draw (ctx); |
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} |
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} |
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} |
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|
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void octant::draw_postdepth (view &ctx) |
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{ |
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oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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|
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if (vs.state == OCCLUDED || !vs.vis) |
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{ |
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ctx.begin_occ_query (*this, 0); |
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sector s = orig - ctx.orig; |
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gl::draw_bbox (s - extent, s + extent); |
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ctx.end_occ_query (); |
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} |
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else |
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{ |
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vs.vis = !size (); |
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|
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for (int i = 0; i < size (); ++i) |
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{ |
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entity *e = (*this)[i]; |
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const evis &evs = vs.get_visibility (i, e); |
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|
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if (evs.state == OCCLUDED) |
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{ |
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if (!ctx.may_draw (e)) |
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continue; |
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|
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ctx.begin_occ_query (*this, e); |
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gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig); |
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ctx.end_occ_query (); |
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} |
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else |
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vs.vis = true; |
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} |
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vs.vis = true;//D |
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} |
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} |
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|
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void octant::draw_lighted (view &ctx) |
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{ |
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oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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|
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#if 0 |
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if (vs.state == FULL || vs.state == OCCLUDED) |
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{ |
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sector s = orig - ctx.orig; |
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debugmat->enable (ctx); |
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if (max (s) >= extent) |
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gl::draw_bbox (s - extent, s + extent); |
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debugmat->disable (ctx); |
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//printf ("DLP %ld %ld %ld (%ld)\n", orig.x, orig.y, orig.z, extent);//D |
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} |
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#endif |
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|
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if (vs.state == OCCLUDED) |
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return; |
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|
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for (int i = 0; i < size (); ++i) |
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{ |
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entity *e = (*this)[i]; |
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evis &evs = vs.get_visibility (i, e); |
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|
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if (evs.state != OCCLUDED) |
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{ |
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if (!ctx.may_draw (e)) |
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continue; |
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|
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sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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GLfloat z = length (vec3 (center)); |
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ctx.pixfact = ctx.perspfact / z; |
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|
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if (!ctx.first_lighted |
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|| evs.last + 1. > timer.now) |
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e->draw (ctx); |
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else |
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{ |
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evs.last = timer.now; |
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ctx.begin_occ_query (*this, e); |
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e->draw (ctx); |
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ctx.end_occ_query (); |
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} |
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} |
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} |
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} |
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|
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void octant::event (occ_query &ev) |
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{ |
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oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx); |
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entity *e = (entity *)ev.id; |
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|
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if (e) |
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{ |
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#if 1 |
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for (vector<evis>::iterator i = vs.vismap.begin (); |
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i != vs.vismap.end (); |
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++i) |
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if (i->e == e) |
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{ |
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i->state = ev.count ? FULL : OCCLUDED; |
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return; |
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} |
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#endif |
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} |
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else |
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{ |
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vs.state = ev.count ? FULL : OCCLUDED; |
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vs.vis = ev.count ? true : false; |
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} |
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} |
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|
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|
