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#8 remove poly-portals clipping code

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XProger
2017-07-24 06:04:50 +03:00
parent e28e5c79e1
commit 79d213ff18
1 changed files with 0 additions and 71 deletions
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71
src/frustum.h
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@@ -6,12 +6,6 @@
#define MAX_CLIP_PLANES 16
struct Frustum {
struct Poly {
vec3 vertices[MAX_CLIP_PLANES];
int count;
};
vec3 pos;
vec4 planes[MAX_CLIP_PLANES * 2]; // + buffer for OBB visibility test
int start, count;
@@ -35,71 +29,6 @@ struct Frustum {
planes[i] *= 1.0f / planes[i].xyz.length();
}
void calcPlanes(const Poly &poly) {
count = 1 + poly.count; // add one for near plane (not changing)
ASSERT(count < MAX_CLIP_PLANES);
if (count < 4) return;
vec3 e1 = poly.vertices[0] - pos;
for (int i = 1; i < count; i++) {
vec3 e2 = poly.vertices[i % poly.count] - pos;
planes[i].xyz = e1.cross(e2).normal();
planes[i].w = -(pos.dot(planes[i].xyz));
e1 = e2;
}
}
void clipPlane(const Poly &src, Poly &dst, const vec4 &plane) {
dst.count = 0;
if (!src.count) return;
float t1 = src.vertices[0].dot(plane.xyz) + plane.w;
for (int i = 0; i < src.count; i++) {
const vec3 &v1 = src.vertices[i];
const vec3 &v2 = src.vertices[(i + 1) % src.count];
float t2 = v2.dot(plane.xyz) + plane.w;
// hack for big float numbers
int s1 = (int)t1;
int s2 = (int)t2;
if (s1 >= 0) {
dst.vertices[dst.count++] = v1;
ASSERT(dst.count < MAX_CLIP_PLANES);
}
if ((s1 ^ s2) < 0) { // check for opposite signs
float k1 = t2 / (t2 - t1);
float k2 = t1 / (t2 - t1);
dst.vertices[dst.count++] = v1 * (float)k1 - v2 * (float)k2;
ASSERT(dst.count < MAX_CLIP_PLANES);
}
t1 = t2;
}
}
bool clipByPortal(const vec3 *vertices, int vCount, const vec3 &normal) {
if (normal.dot(pos - vertices[0]) < 0.0f) // check portal winding order
return false;
Poly poly[2];
poly[0].count = vCount;
memmove(poly[0].vertices, vertices, sizeof(vec3) * poly[0].count);
#ifdef _DEBUG
debugPoly.count = 0;
#endif
int j = 0;
for (int i = 1; i < count; i++, j ^= 1)
clipPlane(poly[j], poly[j ^ 1], planes[i]);
calcPlanes(poly[j]);
return count >= 4;
}
// AABB visibility check
bool isVisible(const vec3 &min, const vec3 &max) const {
if (count < 4) return false;