public virtual void render(GLUtessellatorImpl tess, Mogre.Utils.GluTesselator.GLUhalfEdge e, long size)
{
/* Render as many CCW triangles as possible in a strip starting from
* edge "e". The strip *should* contain exactly "size" triangles
* (otherwise we've goofed up somewhere).
*/
tess.callBeginOrBeginData(GL.GL_TRIANGLE_STRIP);
tess.callVertexOrVertexData(e.Org.data);
tess.callVertexOrVertexData(e.Sym.Org.data);
while (!Mogre.Utils.GluTesselator.Render.Marked(e.Lface))
{
e.Lface.marked = true;
--size;
e = e.Lnext.Sym;
tess.callVertexOrVertexData(e.Org.data);
if (Mogre.Utils.GluTesselator.Render.Marked(e.Lface))
{
break;
}
e.Lface.marked = true;
--size;
e = e.Onext;
tess.callVertexOrVertexData(e.Sym.Org.data);
}
//assert(size == 0);
tess.callEndOrEndData();
}
internal static void RenderLonelyTriangles(GLUtessellatorImpl tess, Mogre.Utils.GluTesselator.GLUface f)
{
/* Now we render all the separate triangles which could not be
* grouped into a triangle fan or strip.
*/
Mogre.Utils.GluTesselator.GLUhalfEdge e;
int newState;
int edgeState = -1; /* force edge state output for first vertex */
tess.callBeginOrBeginData(GL.GL_TRIANGLES);
for (; f != null; f = f.trail)
{
/* Loop once for each edge (there will always be 3 edges) */
e = f.anEdge;
do
{
if (tess.flagBoundary)
{
/* Set the "edge state" to true just before we output the
* first vertex of each edge on the polygon boundary.
*/
newState = (!e.Sym.Lface.inside)?1:0;
if (edgeState != newState)
{
edgeState = newState;
tess.callEdgeFlagOrEdgeFlagData(edgeState != 0);
}
}
tess.callVertexOrVertexData(e.Org.data);
e = e.Lnext;
}while (e != f.anEdge);
}
tess.callEndOrEndData();
}
/// <summary>********************* Boundary contour decomposition *****************</summary>
/* __gl_renderBoundary( tess, mesh ) takes a mesh, and outputs one
* contour for each face marked "inside". The rendering output is
* provided as callbacks (see the api).
*/
public static void __gl_renderBoundary(GLUtessellatorImpl tess, Mogre.Utils.GluTesselator.GLUmesh mesh)
{
Mogre.Utils.GluTesselator.GLUface f;
Mogre.Utils.GluTesselator.GLUhalfEdge e;
for (f = mesh.fHead.next; f != mesh.fHead; f = f.next)
{
if (f.inside)
{
tess.callBeginOrBeginData(GL.GL_LINE_LOOP);
e = f.anEdge;
do
{
tess.callVertexOrVertexData(e.Org.data);
e = e.Lnext;
}
while (e != f.anEdge);
tess.callEndOrEndData();
}
}
}
public virtual void render(GLUtessellatorImpl tess, Mogre.Utils.GluTesselator.GLUhalfEdge e, long size)
{
/* Render as many CCW triangles as possible in a strip starting from
* edge "e". The strip *should* contain exactly "size" triangles
* (otherwise we've goofed up somewhere).
*/
tess.callBeginOrBeginData(GL.GL_TRIANGLE_STRIP);
tess.callVertexOrVertexData(e.Org.data);
tess.callVertexOrVertexData(e.Sym.Org.data);
while (!Mogre.Utils.GluTesselator.Render.Marked(e.Lface))
{
e.Lface.marked = true;
--size;
e = e.Lnext.Sym;
tess.callVertexOrVertexData(e.Org.data);
if (Mogre.Utils.GluTesselator.Render.Marked(e.Lface))
break;
e.Lface.marked = true;
--size;
e = e.Onext;
tess.callVertexOrVertexData(e.Sym.Org.data);
}
//assert(size == 0);
tess.callEndOrEndData();
}
internal static void RenderLonelyTriangles(GLUtessellatorImpl tess, Mogre.Utils.GluTesselator.GLUface f)
{
/* Now we render all the separate triangles which could not be
* grouped into a triangle fan or strip.
*/
Mogre.Utils.GluTesselator.GLUhalfEdge e;
int newState;
int edgeState = - 1; /* force edge state output for first vertex */
tess.callBeginOrBeginData(GL.GL_TRIANGLES);
for (; f != null; f = f.trail)
{
/* Loop once for each edge (there will always be 3 edges) */
e = f.anEdge;
do
{
if (tess.flagBoundary)
{
/* Set the "edge state" to true just before we output the
* first vertex of each edge on the polygon boundary.
*/
newState = (!e.Sym.Lface.inside)?1:0;
if (edgeState != newState)
{
edgeState = newState;
tess.callEdgeFlagOrEdgeFlagData(edgeState != 0);
}
}
tess.callVertexOrVertexData(e.Org.data);
e = e.Lnext;
}
while (e != f.anEdge);
}
tess.callEndOrEndData();
}
/* __gl_renderCache( tess ) takes a single contour and tries to render it
* as a triangle fan. This handles convex polygons, as well as some
* non-convex polygons if we get lucky.
*
* Returns true if the polygon was successfully rendered. The rendering
* output is provided as callbacks (see the api).
*/
public static bool __gl_renderCache(GLUtessellatorImpl tess)
{
Mogre.Utils.GluTesselator.CachedVertex[] v = tess.cache;
// CachedVertex vn = v0 + tess.cacheCount;
int vn = tess.cacheCount;
// CachedVertex vc;
int vc;
double[] norm = new double[3];
int sign;
if (tess.cacheCount < 3)
{
/* Degenerate contour -- no output */
return true;
}
norm[0] = tess.normal[0];
norm[1] = tess.normal[1];
norm[2] = tess.normal[2];
if (norm[0] == 0 && norm[1] == 0 && norm[2] == 0)
{
ComputeNormal(tess, norm, false);
}
sign = ComputeNormal(tess, norm, true);
if (sign == SIGN_INCONSISTENT)
{
/* Fan triangles did not have a consistent orientation */
return false;
}
if (sign == 0)
{
/* All triangles were degenerate */
return true;
}
if (!USE_OPTIMIZED_CODE_PATH)
{
return false;
}
else
{
/* Make sure we do the right thing for each winding rule */
switch (tess.windingRule)
{
case GLU.GLU_TESS_WINDING_ODD:
case GLU.GLU_TESS_WINDING_NONZERO:
break;
case GLU.GLU_TESS_WINDING_POSITIVE:
if (sign < 0)
return true;
break;
case GLU.GLU_TESS_WINDING_NEGATIVE:
if (sign > 0)
return true;
break;
case GLU.GLU_TESS_WINDING_ABS_GEQ_TWO:
return true;
}
tess.callBeginOrBeginData(tess.boundaryOnly?GL.GL_LINE_LOOP:((tess.cacheCount > 3)?GL.GL_TRIANGLE_FAN:GL.GL_TRIANGLES));
tess.callVertexOrVertexData(v[0].data);
if (sign > 0)
{
for (vc = 1; vc < vn; ++vc)
{
tess.callVertexOrVertexData(v[vc].data);
}
}
else
{
for (vc = vn - 1; vc > 0; --vc)
{
tess.callVertexOrVertexData(v[vc].data);
}
}
tess.callEndOrEndData();
return true;
}
}