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#define MAXLIGHTNINGSTEPS 64
#define LIGHTNINGSTEP 8
int lnjitterx[2][MAXLIGHTNINGSTEPS], lnjittery[2][MAXLIGHTNINGSTEPS];
int lnjitterframe = 0, lastlnjitter = 0;
VAR(lnjittermillis, 0, 100, 1000);
VAR(lnjitterradius, 0, 4, 100);
FVAR(lnjitterscale, 0, 0.5f, 10);
VAR(lnscrollmillis, 1, 300, 5000);
FVAR(lnscrollscale, 0, 0.125f, 10);
FVAR(lnblendpower, 0, 0.25f, 1000);
static void calclightningjitter(int frame)
{
loopi(MAXLIGHTNINGSTEPS)
{
lnjitterx[lnjitterframe][i] = -lnjitterradius + rnd(2*lnjitterradius + 1);
lnjittery[lnjitterframe][i] = -lnjitterradius + rnd(2*lnjitterradius + 1);
}
}
static void setuplightning()
{
if(!lastlnjitter || lastmillis-lastlnjitter > lnjittermillis)
{
if(!lastlnjitter) calclightningjitter(lnjitterframe);
lastlnjitter = lastmillis - (lastmillis%lnjittermillis);
calclightningjitter(lnjitterframe ^= 1);
}
}
static void renderlightning(Texture *tex, const vec &o, const vec &d, float sz)
{
vec step(d);
step.sub(o);
float len = step.magnitude();
int numsteps = clamp(int(ceil(len/LIGHTNINGSTEP)), 2, MAXLIGHTNINGSTEPS);
step.div(numsteps+1);
int jitteroffset = detrnd(int(d.x+d.y+d.z), MAXLIGHTNINGSTEPS);
vec cur(o), up, right;
up.orthogonal(step);
up.normalize();
right.cross(up, step);
right.normalize();
float scroll = -float(lastmillis%lnscrollmillis)/lnscrollmillis,
scrollscale = lnscrollscale*(LIGHTNINGSTEP*tex->ys)/(sz*tex->xs),
blend = pow(clamp(float(lastmillis - lastlnjitter)/lnjittermillis, 0.0f, 1.0f), lnblendpower),
jitter0 = (1-blend)*lnjitterscale*sz/lnjitterradius, jitter1 = blend*lnjitterscale*sz/lnjitterradius;
gle::begin(GL_TRIANGLE_STRIP);
loopj(numsteps)
{
vec next(cur);
next.add(step);
if(j+1==numsteps) next = d;
else
{
int lj = (j+jitteroffset)%MAXLIGHTNINGSTEPS;
next.add(vec(right).mul((jitter1*lnjitterx[lnjitterframe][lj] + jitter0*lnjitterx[lnjitterframe^1][lj])));
next.add(vec(up).mul((jitter1*lnjittery[lnjitterframe][lj] + jitter0*lnjittery[lnjitterframe^1][lj])));
}
vec dir1 = next, dir2 = next, across;
dir1.sub(cur);
dir2.sub(camera1->o);
across.cross(dir2, dir1).normalize().mul(sz);
gle::attribf(cur.x-across.x, cur.y-across.y, cur.z-across.z);
gle::attribf(scroll, 1);
gle::attribf(cur.x+across.x, cur.y+across.y, cur.z+across.z);
gle::attribf(scroll, 0);
scroll += scrollscale;
if(j+1==numsteps)
{
gle::attribf(next.x-across.x, next.y-across.y, next.z-across.z);
gle::attribf(scroll, 1);
gle::attribf(next.x+across.x, next.y+across.y, next.z+across.z);
gle::attribf(scroll, 0);
}
cur = next;
}
gle::end();
}
struct lightningrenderer : listrenderer
{
lightningrenderer()
: listrenderer("packages/particles/lightning.jpg", 2, PT_LIGHTNING|PT_TRACK|PT_GLARE)
{}
void startrender()
{
glDisable(GL_CULL_FACE);
gle::defattrib(gle::ATTRIB_VERTEX, 3, GL_FLOAT);
gle::defattrib(gle::ATTRIB_TEXCOORD0, 2, GL_FLOAT);
}
void endrender()
{
glEnable(GL_CULL_FACE);
}
void update()
{
setuplightning();
}
void seedemitter(particleemitter &pe, const vec &o, const vec &d, int fade, float size, int gravity)
{
pe.maxfade = max(pe.maxfade, fade);
pe.extendbb(o, size);
pe.extendbb(d, size);
}
void renderpart(listparticle *p, const vec &o, const vec &d, int blend, int ts)
{
blend = min(blend<<2, 255);
if(type&PT_MOD) //multiply alpha into color
gle::colorub((p->color.r*blend)>>8, (p->color.g*blend)>>8, (p->color.b*blend)>>8);
else
gle::color(p->color, blend);
renderlightning(tex, o, d, p->size);
}
};
static lightningrenderer lightnings;
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