Function OutlineCurrentFace

Descent3/render.cpp:289–327

Draw outline for current edge & vertex

#define PLACED_COLOR GR_RGB(255, 0, 255)
// Draw outline for current edge & vertex
void OutlineCurrentFace(room *rp, int facenum, int edgenum, int vertnum, ddgr_color face_color, ddgr_color edge_color) {
  face *fp = &rp->faces[facenum];
  g3Point p0, p1;
  uint8_t c0, c1;
  int v;
  for (v = 0; v < fp->num_verts; v++) {
    c0 = g3_RotatePoint(&p0, &rp->verts[fp->face_verts[v]]);
    c1 = g3_RotatePoint(&p1, &rp->verts[fp->face_verts[(v + 1) % fp->num_verts]]);
    if (!(c0 & c1)) { // both not off screen?
      // Draw current edge in green
      g3_DrawLine((v == edgenum) ? edge_color : face_color, &p0, &p1);
    }
    if ((v == vertnum) && (c0 == 0)) {
      // Draw a little cross at the current vert
      g3_ProjectPoint(&p0); // make sure projected
      rend_SetFlatColor(edge_color);
      rend_DrawLine(p0.p3_sx - CROSS_WIDTH, p0.p3_sy, p0.p3_sx, p0.p3_sy - CROSS_HEIGHT);
      rend_DrawLine(p0.p3_sx, p0.p3_sy - CROSS_HEIGHT, p0.p3_sx + CROSS_WIDTH, p0.p3_sy);
      rend_DrawLine(p0.p3_sx + CROSS_WIDTH, p0.p3_sy, p0.p3_sx, p0.p3_sy + CROSS_HEIGHT);
      rend_DrawLine(p0.p3_sx, p0.p3_sy + CROSS_HEIGHT, p0.p3_sx - CROSS_WIDTH, p0.p3_sy);
    }
  }
  // Draw upper left cross
  if (Outline_lightmaps && (rp->faces[facenum].flags & FF_LIGHTMAP)) {
    ASSERT(rp->faces[facenum].lmi_handle != BAD_LMI_INDEX);

    p0.p3_flags = 0;
    c0 = g3_RotatePoint(&p0, &LightmapInfo[rp->faces[facenum].lmi_handle].upper_left);
    if (!c0) {
      // Draw a little cross at the current vert
      g3_ProjectPoint(&p0); // make sure projected
      rend_SetFlatColor(GR_RGB(255, 0, 0));
      rend_DrawLine(p0.p3_sx - CROSS_WIDTH, p0.p3_sy, p0.p3_sx, p0.p3_sy - CROSS_HEIGHT);
      rend_DrawLine(p0.p3_sx, p0.p3_sy - CROSS_HEIGHT, p0.p3_sx + CROSS_WIDTH, p0.p3_sy);
      rend_DrawLine(p0.p3_sx + CROSS_WIDTH, p0.p3_sy, p0.p3_sx, p0.p3_sy + CROSS_HEIGHT);
      rend_DrawLine(p0.p3_sx, p0.p3_sy + CROSS_HEIGHT, p0.p3_sx - CROSS_WIDTH, p0.p3_sy);
    }
  }
}

//	Draw a room rotated and placed in space
static void DrawPlacedRoomFace(room *rp, vector *rotpoint, matrix *rotmat, vector *placepoint, int facenum, int color) {