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#include <algorithm>
#include <cmath>
#include "Decals.h"
#define NORMAL_OFFSET 0.02f
enum corner { SW, SE, NE, NW };
void bind(struct Decals *d, XYZ location, float size, XYZ normal,
int poly, Model *model, XYZ move, float rotation,
XYZ right, XYZ up, enum corner direction)
{
float x, y;
switch (direction) {
case SW:
x = -1.0f;
y = -1.0f;
break;
case NW:
x = 1.0f;
y = -1.0f;
break;
case NE:
x = 1.0f;
y = 1.0f;
break;
case SE:
x = -1.0f;
y = 1.0f;
break;
}
size_t i = d->len * 8 + d->numpoints[d->len];
d->points[i] = location + right * x + up * y;
d->texcoordsx[i] = x * 0.5f + 0.5f;
d->texcoordsy[i] = y * 0.5f + 0.5f;
XYZ temp;
if ((move.x == 0 && move.y == 0 && move.z == 0 && rotation == 0)
|| segCrossTrigon(d->points[i] + normal / 25,
d->points[i] - normal / 25,
model->vertex + model->Triangles[poly].vertex[0],
model->vertex + model->Triangles[poly].vertex[1],
model->vertex + model->Triangles[poly].vertex[2],
&normal, &temp)) {
d->numpoints[d->len]++;
return;
}
const auto n = normal / 25.0f;
const float countinc = std::max(0.01f, std::min(1.0f / size, 0.2f));
int good = -1;
float count = 1.0f - countinc;
while (good == -1 && count > -1.0f) {
d->texcoordsx[i] = x * 0.5f + 0.5f;
d->texcoordsy[i] = y * count * 0.5f + 0.5f;
d->points[i] = location + right * x + up * (y * count);
count -= countinc;
good = model->LineCheck2(d->points[i] + n,
d->points[i] - n,
&temp, move, rotation);
}
if (good > -1) {
d->numpoints[d->len]++;
i++;
}
good = -1;
count = 1.0f - countinc;
while (good == -1 && count > -1.0f) {
d->texcoordsx[i] = x * count * 0.5f + 0.5f;
d->texcoordsy[i] = y * 0.5f + 0.5f;
d->points[i] = location + right * (x * count) + up * y;
count -= countinc;
good = model->LineCheck2(d->points[i] + n,
d->points[i] - n,
&temp, move, rotation);
}
if (good > -1) {
d->numpoints[d->len]++;
return;
}
float count2 = 1.0f - countinc;
while (good == -1 && count2 > -1.0f){
count = 1.0f - countinc;
while (good == -1 && count > -1.0f) {
d->texcoordsx[i] = x * count2 * 0.5f + 0.5f;
d->texcoordsy[i] = y * count * 0.5f + 0.5f;
d->points[i] = location + right * (x * count2) + up * (y * count);
count -= countinc;
good = model->LineCheck2(d->points[i] + n,
d->points[i] - n,
&temp, move, rotation);
}
count2 -= countinc;
}
if (good > -1)
d->numpoints[d->len]++;
}
void addDecal(struct Decals *d, enum decal kind, XYZ location, float size,
XYZ normal, int poly, Model *model, XYZ move, float rotation)
{
if (d->len >= MAX_DECALS)
return;
d->kind[d->len] = kind;
d->alive[d->len] = 0;
float normalv[] = {abs(normal.x), abs(normal.y), abs(normal.z)};
unsigned char major = 0;
if (normalv[1] > normalv[major])
major = 1;
if (normalv[2] > normalv[major])
major = 2;
XYZ right = {0.0f};
if (normalv[0] == 1.0f || normalv[1] == 1.0f || normalv[2] == 1.0f) {
if ((major == 0 && normal.x > 0) || major == 1)
right.z = -1.0f;
else if (major == 0)
right.z = 1.0f;
else
right.x = normal.z;
} else {
XYZ axis = {0.0f};
((float *) &axis)[major] = 1.0f;
right = crossProduct(axis, normal);
}
d->numpoints[d->len] = 0;
XYZ up = normalize(crossProduct(normal, right)) * (size / 3);
right = normalize(right) * (size / 3);
bind(d, location, size, normal, poly, model,
move, rotation, right, up, SW);
bind(d, location, size, normal, poly, model,
move, rotation, right, up, NW);
bind(d, location, size, normal, poly, model,
move, rotation, right, up, NE);
bind(d, location, size, normal, poly, model,
move, rotation, right, up, SE);
for (int i = 0; i < d->numpoints[d->len]; ++i)
d->points[d->len * 8 + i] += normal * NORMAL_OFFSET;
d->len++;
}
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