static void drawSubspace(ConvexSubspace const &subspace)
{
float const scale = de::max(bmapDebugSize, 1.f);
float const width = (DENG_GAMEVIEW_WIDTH / 16) / scale;
Face const &poly = subspace.poly();
HEdge *base = poly.hedge();
HEdge *hedge = base;
do
{
Vector2d start = hedge->origin();
Vector2d end = hedge->twin().origin();
glBegin(GL_LINES);
glVertex2f(start.x, start.y);
glVertex2f(end.x, end.y);
glEnd();
ddouble length = (end - start).length();
if(length > 0)
{
Vector2d const unit = (end - start) / length;
Vector2d const normal(-unit.y, unit.x);
GL_BindTextureUnmanaged(GL_PrepareLSTexture(LST_DYNAMIC));
glEnable(GL_TEXTURE_2D);
GL_BlendMode(BM_ADD);
glBegin(GL_QUADS);
glTexCoord2f(0.75f, 0.5f);
glVertex2f(start.x, start.y);
glTexCoord2f(0.75f, 0.5f);
glVertex2f(end.x, end.y);
glTexCoord2f(0.75f, 1);
glVertex2f(end.x - normal.x * width, end.y - normal.y * width);
glTexCoord2f(0.75f, 1);
glVertex2f(start.x - normal.x * width, start.y - normal.y * width);
glEnd();
glDisable(GL_TEXTURE_2D);
GL_BlendMode(BM_NORMAL);
}
// Draw a bounding box for the leaf's face geometry.
start = Vector2d(poly.aaBox().minX, poly.aaBox().minY);
end = Vector2d(poly.aaBox().maxX, poly.aaBox().maxY);
glBegin(GL_LINES);
glVertex2f(start.x, start.y);
glVertex2f( end.x, start.y);
glVertex2f( end.x, start.y);
glVertex2f( end.x, end.y);
glVertex2f( end.x, end.y);
glVertex2f(start.x, end.y);
glVertex2f(start.x, end.y);
glVertex2f(start.x, start.y);
glEnd();
} while((hedge = &hedge->next()) != base);
}
/**
* Attempt to spread the obj from the given contact from the source subspace
* and into the (relative) back subsapce.
*
* @param subspace Convex subspace to attempt to spread over to.
*
* @return Always @c true. (This function is also used as an iterator.)
*/
void spreadInSubspace(ConvexSubspace &subspace)
{
HEdge *base = subspace.poly().hedge();
HEdge *hedge = base;
do
{
maybeSpreadOverEdge(hedge);
} while((hedge = &hedge->next()) != base);
}
/**
* @return @c true if the ray passes @a bspLeaf; otherwise @c false.
*/
bool crossBspLeaf(BspLeaf const &bspLeaf)
{
if(!bspLeaf.hasSubspace())
return false;
ConvexSubspace const &subspace = bspLeaf.subspace();
// Check polyobj lines.
LoopResult blocked = subspace.forAllPolyobjs([this] (Polyobj &pob)
{
for(Line *line : pob.lines())
{
if(!crossLine(line->front()))
return LoopAbort;
}
return LoopContinue;
});
if(blocked) return false;
// Check lines for the edges of the subspace geometry.
HEdge *base = subspace.poly().hedge();
HEdge *hedge = base;
do
{
if(hedge->hasMapElement())
{
if(!crossLine(hedge->mapElementAs<LineSideSegment>().lineSide()))
return false;
}
} while((hedge = &hedge->next()) != base);
// Check lines for the extra meshes.
blocked = subspace.forAllExtraMeshes([this] (Mesh &mesh)
{
for(HEdge *hedge : mesh.hedges())
{
// Is this on the back of a one-sided line?
if(!hedge->hasMapElement())
continue;
if(!crossLine(hedge->mapElementAs<LineSideSegment>().lineSide()))
return LoopAbort;
}
return LoopContinue;
});
return !blocked;
}
