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-rw-r--r--src/engine/lensflare.h193
1 files changed, 193 insertions, 0 deletions
diff --git a/src/engine/lensflare.h b/src/engine/lensflare.h
new file mode 100644
index 0000000..1618e52
--- /dev/null
+++ b/src/engine/lensflare.h
@@ -0,0 +1,193 @@
+static struct flaretype
+{
+ int type; /* flaretex index, 0..5, -1 for 6+random shine */
+ float loc; /* postion on axis */
+ float scale; /* texture scaling */
+ uchar alpha; /* color alpha */
+} flaretypes[] =
+{
+ {2, 1.30f, 0.04f, 153}, //flares
+ {3, 1.00f, 0.10f, 102},
+ {1, 0.50f, 0.20f, 77},
+ {3, 0.20f, 0.05f, 77},
+ {0, 0.00f, 0.04f, 77},
+ {5, -0.25f, 0.07f, 127},
+ {5, -0.40f, 0.02f, 153},
+ {5, -0.60f, 0.04f, 102},
+ {5, -1.00f, 0.03f, 51},
+ {-1, 1.00f, 0.30f, 255}, //shine - red, green, blue
+ {-2, 1.00f, 0.20f, 255},
+ {-3, 1.00f, 0.25f, 255}
+};
+
+struct flare
+{
+ vec o, center;
+ float size;
+ bvec color;
+ bool sparkle;
+};
+
+VAR(flarelights, 0, 0, 1);
+VARP(flarecutoff, 0, 1000, 10000);
+VARP(flaresize, 20, 100, 500);
+
+struct flarerenderer : partrenderer
+{
+ int maxflares, numflares;
+ unsigned int shinetime;
+ flare *flares;
+
+ flarerenderer(const char *texname, int maxflares)
+ : partrenderer(texname, 3, PT_FLARE|PT_SHADER), maxflares(maxflares), numflares(0), shinetime(0)
+ {
+ flares = new flare[maxflares];
+ }
+ ~flarerenderer()
+ {
+ delete[] flares;
+ }
+
+ void reset()
+ {
+ numflares = 0;
+ }
+
+ void newflare(vec &o, const vec &center, uchar r, uchar g, uchar b, float mod, float size, bool sun, bool sparkle)
+ {
+ if(numflares >= maxflares) return;
+ vec target; //occlusion check (neccessary as depth testing is turned off)
+ if(!raycubelos(o, camera1->o, target)) return;
+ flare &f = flares[numflares++];
+ f.o = o;
+ f.center = center;
+ f.size = size;
+ f.color = bvec(uchar(r*mod), uchar(g*mod), uchar(b*mod));
+ f.sparkle = sparkle;
+ }
+
+ void addflare(vec &o, uchar r, uchar g, uchar b, bool sun, bool sparkle)
+ {
+ //frustrum + fog check
+ if(isvisiblesphere(0.0f, o) > (sun?VFC_FOGGED:VFC_FULL_VISIBLE)) return;
+ //find closest point between camera line of sight and flare pos
+ vec flaredir = vec(o).sub(camera1->o);
+ vec center = vec(camdir).mul(flaredir.dot(camdir)).add(camera1->o);
+ float mod, size;
+ if(sun) //fixed size
+ {
+ mod = 1.0;
+ size = flaredir.magnitude() * flaresize / 100.0f;
+ }
+ else
+ {
+ mod = (flarecutoff-vec(o).sub(center).squaredlen())/flarecutoff;
+ if(mod < 0.0f) return;
+ size = flaresize / 5.0f;
+ }
+ newflare(o, center, r, g, b, mod, size, sun, sparkle);
+ }
+
+ void makelightflares()
+ {
+ numflares = 0; //regenerate flarelist each frame
+ shinetime = lastmillis/10;
+
+ if(editmode || !flarelights) return;
+
+ const vector<extentity *> &ents = entities::getents();
+ extern const vector<int> &checklightcache(int x, int y);
+ const vector<int> &lights = checklightcache(int(camera1->o.x), int(camera1->o.y));
+ loopv(lights)
+ {
+ entity &e = *ents[lights[i]];
+ if(e.type != ET_LIGHT) continue;
+ bool sun = (e.attr1==0);
+ float radius = float(e.attr1);
+ vec flaredir = vec(e.o).sub(camera1->o);
+ float len = flaredir.magnitude();
+ if(!sun && (len > radius)) continue;
+ if(isvisiblesphere(0.0f, e.o) > (sun?VFC_FOGGED:VFC_FULL_VISIBLE)) continue;
+ vec center = vec(camdir).mul(flaredir.dot(camdir)).add(camera1->o);
+ float mod, size;
+ if(sun) //fixed size
+ {
+ mod = 1.0;
+ size = len * flaresize / 100.0f;
+ }
+ else
+ {
+ mod = (radius-len)/radius;
+ size = flaresize / 5.0f;
+ }
+ newflare(e.o, center, e.attr2, e.attr3, e.attr4, mod, size, sun, sun);
+ }
+ }
+
+ int count()
+ {
+ return numflares;
+ }
+
+ bool haswork()
+ {
+ return (numflares != 0) && !glaring && !reflecting && !refracting;
+ }
+
+ void render()
+ {
+ textureshader->set();
+ glDisable(GL_DEPTH_TEST);
+ if(!tex) tex = textureload(texname);
+ glBindTexture(GL_TEXTURE_2D, tex->id);
+ gle::defattrib(gle::ATTRIB_VERTEX, 3, GL_FLOAT);
+ gle::defattrib(gle::ATTRIB_TEXCOORD0, 2, GL_FLOAT);
+ gle::defattrib(gle::ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE);
+ gle::begin(GL_QUADS);
+ loopi(numflares)
+ {
+ const flare &f = flares[i];
+ vec center = f.center;
+ vec axis = vec(f.o).sub(center);
+ bvec4 color(f.color, 255);
+ loopj(f.sparkle?12:9)
+ {
+ const flaretype &ft = flaretypes[j];
+ vec o = vec(axis).mul(ft.loc).add(center);
+ float sz = ft.scale * f.size;
+ int tex = ft.type;
+ if(ft.type < 0) //sparkles - always done last
+ {
+ shinetime = (shinetime + 1) % 10;
+ tex = 6+shinetime;
+ color.r = 0;
+ color.g = 0;
+ color.b = 0;
+ color[-ft.type-1] = f.color[-ft.type-1]; //only want a single channel
+ }
+ color.a = ft.alpha;
+ const float tsz = 0.25; //flares are aranged in 4x4 grid
+ float tx = tsz*(tex&0x03), ty = tsz*((tex>>2)&0x03);
+ gle::attribf(o.x+(-camright.x+camup.x)*sz, o.y+(-camright.y+camup.y)*sz, o.z+(-camright.z+camup.z)*sz);
+ gle::attribf(tx, ty+tsz);
+ gle::attrib(color);
+ gle::attribf(o.x+( camright.x+camup.x)*sz, o.y+( camright.y+camup.y)*sz, o.z+( camright.z+camup.z)*sz);
+ gle::attribf(tx+tsz, ty+tsz);
+ gle::attrib(color);
+ gle::attribf(o.x+( camright.x-camup.x)*sz, o.y+( camright.y-camup.y)*sz, o.z+( camright.z-camup.z)*sz);
+ gle::attribf(tx+tsz, ty);
+ gle::attrib(color);
+ gle::attribf(o.x+(-camright.x-camup.x)*sz, o.y+(-camright.y-camup.y)*sz, o.z+(-camright.z-camup.z)*sz);
+ gle::attribf(tx, ty);
+ gle::attrib(color);
+ }
+ }
+ gle::end();
+ glEnable(GL_DEPTH_TEST);
+ }
+
+ //square per round hole - use addflare(..) instead
+ particle *addpart(const vec &o, const vec &d, int fade, int color, float size, int gravity = 0) { return NULL; }
+};
+static flarerenderer flares("<grey>packages/particles/lensflares.png", 64);
+
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