mirror of
https://git.code.sf.net/p/quake/newtree
synced 2024-11-28 23:02:31 +00:00
cleanup and document current code. Also catch a couple of possible bugs in the
process
This commit is contained in:
Bill Currie
parent
293d2bcc13
commit
c604d261f7
1 changed files with 119 additions and 64 deletions
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@ -33,10 +33,32 @@
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#include "console.h"
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#include "glquake.h"
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// Set to true if a valid skybox is loaded --KB
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extern qboolean skyloaded;
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extern vec5_t skyvec[6][4];
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/* cube face to sky texture offset conversion */
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static const int skytex_offs[] = {3, 0, 4, 1, 2, 5};
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/* clockwise loop through the cube faces adjoining the current face */
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static const int face_loop[6][5] = {
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{1, 2, 4, 5, 1},
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{0, 5, 3, 2, 0},
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{0, 1, 3, 4, 0},
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{1, 5, 4, 2, 1},
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{0, 2, 3, 5, 0},
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{0, 4, 3, 1, 0},
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};
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/* axis the cube face cuts (also index into vec3_t for) */
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static const int face_axis[] = {0, 1, 2, 0, 1, 2};
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/* offset on the axis the cube face cuts */
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static const vec_t face_offset[] = {1024, 1024, 1024, -1024, -1024, -1024};
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/* our cube */
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struct box_def {
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int tex, enter, leave;
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glpoly_t poly;
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float verts[32][VERTEXSIZE];
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};
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/*
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determine_face
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@ -67,8 +89,10 @@ determine_face (vec3_t v)
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m = a[2];
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i = 2;
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}
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if (!m)
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if (!m) {
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Con_Printf ("%s speared by sky poly edge\n", name->string);
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abort();
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}
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if (v[i] < 0)
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i += 3;
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VectorScale (v, 1024/m, v);
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@ -123,12 +147,14 @@ find_intersect (int face1, vec3_t x1, int face2, vec3_t x2, vec3_t y)
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VectorSubtract (x, t, y);
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}
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struct box_def {
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int tex, enter, leave;
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glpoly_t poly;
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float verts[32][VERTEXSIZE];
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};
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/*
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set_vertex
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add the vertex to the polygon describing the face of the cube. Offsets
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the vertex relative to r_refdef.vieworg so the cube is always centered
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on the player and also calculates the texture coordinates of the vertex
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(wish I could find a cleaner way of calculating s and t).
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*/
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static void
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set_vertex (struct box_def *box, vec3_t v, int face)
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{
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@ -168,7 +194,9 @@ set_vertex (struct box_def *box, vec3_t v, int face)
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get the coords of the vertex common to the three specified faces of the
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cube. NOTE: this WILL break if the three faces do not share a common
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vertex.
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vertex. ie works = ((face1 % 3 != face2 % 3)
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&& (face2 % 3 != face3 % 3)
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&& (face1 % 3 != face3 % 3))
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*/
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static void
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find_cube_vertex (int face1, int face2, int face3, vec3_t v)
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@ -178,6 +206,12 @@ find_cube_vertex (int face1, int face2, int face3, vec3_t v)
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v[face3 % 3] = 1024 * (1 - 2 * (face3 / 3));
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}
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/*
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enter_face
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if we left this face on an adjoining face with a common vertex, add
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that vertex to the cube face polygon.
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*/
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static void
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enter_face (struct box_def *box, int prev_face, int face)
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{
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@ -192,6 +226,12 @@ enter_face (struct box_def *box, int prev_face, int face)
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box[face].leave = -1;
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}
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/*
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leave_face
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if we entered this face on an adjoining face with a common vertex, add
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that vertex to the cube face polygon.
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*/
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static void
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leave_face (struct box_def *box, int prev_face, int face)
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{
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@ -206,6 +246,11 @@ leave_face (struct box_def *box, int prev_face, int face)
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box[prev_face].enter = -1;
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}
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/*
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render_box
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draws all faces of the cube with 3 or more vertexen.
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*/
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static void
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render_box (struct box_def *box)
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{
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@ -224,15 +269,66 @@ render_box (struct box_def *box)
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}
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}
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/*
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fixup_center_face
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add the vertexen of the cube face that should be draw but was not
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clipped by the sky polygon because it was fully enclosed by the
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polygon. Also adds the missing vertexen to the surrounding cube faces.
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*/
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static void
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fixup_center_face (struct box_def *box, int c_face)
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{
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vec3_t v[4];
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int i;
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for (i = 0; i < 4; i++) {
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find_cube_vertex (c_face, face_loop[c_face][i],
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face_loop[c_face][i + 1], v[i]);
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set_vertex(box, v[i], c_face);
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}
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for (i = 0; i < 4; i++) {
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set_vertex (box, v[i], face_loop[c_face][i]);
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set_vertex (box, v[(i - 1) & 3], face_loop[c_face][i]);
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}
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}
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/*
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cross_cube_edge
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add the vertex formed by the poly edge crossing the cube edge to the
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polygon for the two faces on that edge. Actually, the two faces define
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the edge :). The poly edge is going from face 1 to face 2 (for
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enter/leave purposes).
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*/
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void
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cross_cube_edge (struct box_def *box, int face1, vec3_t v1, int face2,
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vec3_t v2)
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{
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vec3_t l;
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find_intersect (face1, v1, face2, v2, l);
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set_vertex(box, l, face1);
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leave_face (box, face1, face2);
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enter_face (box, face1, face2);
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set_vertex(box, l, face2);
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}
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void
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R_DrawSkyBoxPoly (glpoly_t *poly)
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{
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static const int skytex_offs[] = {3, 0, 4, 1, 2, 5};
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vec3_t v, last_v;
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vec3_t center = {0, 0, 0};
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struct box_def box[6];
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int i;
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int face, prev_face, c_face;
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struct box_def box[6];
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/* projected vertex and face of the previous sky poly vertex */
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vec3_t last_v;
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int prev_face;
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/* projected vertex and face of the current sky poly vertex */
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vec3_t v;
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int face;
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/* projected vertex and face of the center of the sky poly */
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vec3_t center = {0, 0, 0};
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int c_face;
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memset (box, 0, sizeof (box));
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for (i = 0; i < 6; i++) {
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@ -245,49 +341,26 @@ R_DrawSkyBoxPoly (glpoly_t *poly)
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abort();
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}
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for (i = 0; i < poly->numverts; i++) {
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VectorAdd (poly->verts[i], center, center);
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VectorSubtract (center, r_refdef.vieworg, center);
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}
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VectorScale (center, 1.0/poly->numverts, center);
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c_face = determine_face (center);
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VectorSubtract (poly->verts[poly->numverts - 1], r_refdef.vieworg, v);
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prev_face = determine_face (v);
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VectorCopy (v, last_v);
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VectorSubtract (poly->verts[poly->numverts - 1], r_refdef.vieworg, last_v);
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prev_face = determine_face (last_v);
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for (i=0; i< poly->numverts; i++) {
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VectorSubtract (poly->verts[i], r_refdef.vieworg, v);
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VectorAdd (v, center, center);
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face = determine_face (v);
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if (face != prev_face) {
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if ((face % 3) == (prev_face % 3)) {
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vec3_t l, x;
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vec3_t x;
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int x_face;
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VectorAdd (v, last_v, x);
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VectorScale (x, 0.5, x);
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x_face = determine_face (x);
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find_intersect (prev_face, last_v, x_face, v, l);
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set_vertex(box, l, prev_face);
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leave_face (box, prev_face, x_face);
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enter_face (box, prev_face, x_face);
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find_intersect (x_face, last_v, face, v, l);
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leave_face (box, x_face, face);
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enter_face (box, x_face, face);
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set_vertex(box, l, face);
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cross_cube_edge (box, prev_face, last_v, x_face, x);
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cross_cube_edge (box, x_face, x, face, v);
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} else {
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vec3_t l;
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find_intersect (prev_face, last_v, face, v, l);
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set_vertex(box, l, prev_face);
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leave_face (box, prev_face, face);
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enter_face (box, prev_face, face);
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set_vertex(box, l, face);
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cross_cube_edge (box, prev_face, last_v, face, v);
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}
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}
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set_vertex(box, v, face);
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@ -295,28 +368,10 @@ R_DrawSkyBoxPoly (glpoly_t *poly)
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VectorCopy (v, last_v);
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prev_face = face;
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}
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c_face = determine_face (center);
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if (box[c_face].poly.numverts == 0) {
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vec3_t v;
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static const int face_loop[6][5] = {
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{1, 2, 4, 5, 1},
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{0, 5, 3, 2, 0},
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{0, 1, 3, 4, 0},
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{1, 5, 4, 2, 1},
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{0, 2, 3, 5, 0},
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{0, 4, 3, 1, 0},
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};
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for (i = 0; i < 4; i++) {
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find_cube_vertex (c_face, face_loop[c_face][i],
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face_loop[c_face][i + 1], v);
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set_vertex(box, v, c_face);
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}
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for (i = 0; i < 4; i++) {
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set_vertex (box, box[c_face].poly.verts[i], face_loop[c_face][i]);
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set_vertex (box, box[c_face].poly.verts[(i - 1) & 3],
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face_loop[c_face][i]);
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}
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}
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if (box[c_face].poly.numverts == 0)
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fixup_center_face (box, c_face);
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render_box (box);
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}
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