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framed cube faces work now! :) clockwise polygon rules are very convenient 

(ccw would be just as good, it's the rule that counts:)
This commit is contained in:
Bill Currie 2000-11-18 06:44:08 +00:00
parent f62b1dd2d4
commit 5ae45ec667
1 changed files with 35 additions and 8 deletions
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43
source/gl_sky_clip.c
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@ -50,6 +50,12 @@ static const int face_loop[6][5] = {
{0, 2, 3, 5, 0},
{0, 4, 3, 1, 0},
};
/* convert axis and face distance into face*/
static const int faces_table[3][6] = {
{-1, 0, 0, -1, 3, 3},
{-1, 4, 4, -1, 1, 1},
{-1, 2, 2, -1, 5, 5},
};
/* axis the cube face cuts (also index into vec3_t for) */
static const int face_axis[] = {0, 1, 2, 0, 1, 2};
/* offset on the axis the cube face cuts */
@ -360,11 +366,13 @@ R_DrawSkyBoxPoly (glpoly_t *poly)
/* projected vertex and face of the current sky poly vertex */
vec3_t v;
int face;
/* projected vertex and face of the center of the sky poly */
vec3_t center = {0, 0, 0};
int c_face;
/* keep track of which cube faces we visit and in what order */
int visited_faces [6];
int faces_flags [6];
int face_count = 0;
memset (box, 0, sizeof (box));
memset (faces_flags, 0, sizeof faces_flags);
for (i = 0; i < 6; i++) {
box[i].tex = SKY_TEX + skytex_offs[i];
box[i].enter_face = box[i].leave_face = -1;
@ -379,7 +387,6 @@ R_DrawSkyBoxPoly (glpoly_t *poly)
for (i=0; i< poly->numverts; i++) {
VectorSubtract (poly->verts[i], r_refdef.vieworg, v);
VectorAdd (v, center, center);
face = determine_face (v);
if (face != prev_face) {
if ((face % 3) == (prev_face % 3)) {
@ -390,21 +397,41 @@ R_DrawSkyBoxPoly (glpoly_t *poly)
VectorScale (x, 0.5, x);
x_face = determine_face (x);
if (!faces_flags[x_face]) {
faces_flags[x_face] = 1;
visited_faces[face_count++] = x_face;
}
cross_cube_edge (box, prev_face, last_v, x_face, x);
cross_cube_edge (box, x_face, x, face, v);
} else {
cross_cube_edge (box, prev_face, last_v, face, v);
}
}
if (!faces_flags[face]) {
faces_flags[face] = 1;
visited_faces[face_count++] = face;
}
add_vertex(box, face, v);
VectorCopy (v, last_v);
prev_face = face;
}
c_face = determine_face (center);
if (box[c_face].poly.numverts == 0)
fixup_center_face (box, c_face);
if (face_count == 4
&& abs (visited_faces[2] - visited_faces[0]) == 3
&& abs (visited_faces[3] - visited_faces[1]) == 3) {
int framed_face;
int sum, diff;
sum = visited_faces[0] + visited_faces[1] + visited_faces[2] + visited_faces[3];
diff = visited_faces[1] - visited_faces[0];
sum %= 3;
diff = (diff + 6) % 6;
framed_face = faces_table[sum][diff];
if (box[framed_face].poly.numverts == 0)
fixup_center_face (box, framed_face);
else
printf ("email bill@taniwha.org re framed face > 0 verts\n");
}
render_box (box);
}