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getting there with the skybox clipping. DO NOT play with gl_sky_clip if you

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have a skybox loaded unless you're prepared to work on the code :)
This commit is contained in:
Bill Currie 2000-11-08 08:25:48 +00:00
parent f8343a2707
commit bc06876fa8
1 changed files with 69 additions and 2 deletions
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71
source/gl_sky.c
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@ -268,18 +268,85 @@ R_DrawSky (void)
R_DrawSkyDome ();
}
/*
determine_face
return the face of the cube which v hits first
0 +x
1 +y
2 +z
3 -x
4 -y
5 -z
*/
static int
determine_face (vec3_t v)
{
float a[3] = {fabs (v[0]), fabs (v[1]), fabs (v[2])};
float m = a[0];
int i=0;
if (a[1] > m) {
m = a[1];
i = 1;
}
if (a[2] > m) {
m = a[2];
i = 2;
}
if (!m)
abort();
if (v[i] < 0)
i += 3;
VectorScale (v, 1024/m, v);
return i;
}
void
R_DrawSkyBoxPoly (glpoly_t *poly)
{
vec3_t verts[32];
vec3_t v, last_v;
struct {
glpoly_t poly;
float verts[32][VERTEXSIZE];
} box[6];
glpoly_t *p;
int i;
int face, prev_face;
memset (box, 0, sizeof (box));
if (poly->numverts>=32) {
Con_Printf ("too many verts!");
abort();
}
VectorSubtract (poly->verts[poly->numverts - 1], r_refdef.vieworg, v);
prev_face = determine_face (v);
p = &box[prev_face].poly;
VectorCopy (v, last_v);
for (i=0; i< poly->numverts; i++) {
VectorSubtract (poly->verts[i], r_refdef.vieworg, verts[i]);
VectorSubtract (poly->verts[i], r_refdef.vieworg, v);
face = determine_face (v);
if (face != prev_face) {
if (face % 3 == prev_face % 3) {
// ouch, miss a face
} else {
vec3_t l;
VectorSubtract (v, last_v, l);
l[prev_face % 3] = 0;
VectorAdd (last_v, l, l);
p = &box[prev_face].poly;
VectorCopy (l, p->verts[p->numverts++]);
p = &box[face].poly;
VectorCopy (l, p->verts[p->numverts++]);
}
}
p = &box[face].poly;
VectorCopy (v, p->verts[p->numverts++]);
VectorCopy (v, last_v);
prev_face = face;
}
}