Initial commit

Torque/SDK/engine/collision/clippedPolyList.cc

@@ -0,0 +1,268 @@
+//-----------------------------------------------------------------------------
+// Torque Game Engine
+// Copyright (C) GarageGames.com, Inc.
+//-----------------------------------------------------------------------------
+
+#include "platform/platform.h"
+#include "dgl/dgl.h"
+#include "math/mMath.h"
+#include "console/console.h"
+#include "collision/clippedPolyList.h"
+
+
+//----------------------------------------------------------------------------
+
+ClippedPolyList::ClippedPolyList()
+{
+   VECTOR_SET_ASSOCIATION(mPolyList);
+   VECTOR_SET_ASSOCIATION(mVertexList);
+   VECTOR_SET_ASSOCIATION(mIndexList);
+   VECTOR_SET_ASSOCIATION(mPolyPlaneList);
+   VECTOR_SET_ASSOCIATION(mPlaneList);
+
+   mNormal.set(0,0,0);
+   mIndexList.reserve(100);
+}
+
+ClippedPolyList::~ClippedPolyList()
+{
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::clear()
+{
+   // Only clears internal data
+   mPolyList.clear();
+   mVertexList.clear();
+   mIndexList.clear();
+   mPolyPlaneList.clear();
+}
+
+bool ClippedPolyList::isEmpty() const
+{
+   return mPolyList.size() == 0;
+}
+
+
+//----------------------------------------------------------------------------
+
+U32 ClippedPolyList::addPoint(const Point3F& p)
+{
+   mVertexList.increment();
+   Vertex& v = mVertexList.last();
+   v.point.x = p.x * mScale.x;
+   v.point.y = p.y * mScale.y;
+   v.point.z = p.z * mScale.z;
+   mMatrix.mulP(v.point);
+
+   // Build the plane mask
+   register U32      mask = 1;
+   register S32      count = mPlaneList.size();
+   register PlaneF * plane = mPlaneList.address();
+
+   v.mask = 0;
+   while(--count >= 0) {
+      if (plane++->distToPlane(v.point) > 0)
+         v.mask |= mask;
+      mask <<= 1;
+   }
+
+   return mVertexList.size() - 1;
+}
+
+
+U32 ClippedPolyList::addPlane(const PlaneF& plane)
+{
+   mPolyPlaneList.increment();
+   mPlaneTransformer.transform(plane, mPolyPlaneList.last());
+
+   return mPolyPlaneList.size() - 1;
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::begin(U32 material,U32 surfaceKey)
+{
+   mPolyList.increment();
+   Poly& poly = mPolyList.last();
+   poly.object = mCurrObject;
+   poly.material = material;
+   poly.vertexStart = mIndexList.size();
+   poly.surfaceKey = surfaceKey;
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::plane(U32 v1,U32 v2,U32 v3)
+{
+   mPolyList.last().plane.set(mVertexList[v1].point,
+      mVertexList[v2].point,mVertexList[v3].point);
+}
+
+void ClippedPolyList::plane(const PlaneF& p)
+{
+   mPlaneTransformer.transform(p, mPolyList.last().plane);
+}
+
+void ClippedPolyList::plane(const U32 index)
+{
+   AssertFatal(index < mPolyPlaneList.size(), "Out of bounds index!");
+   mPolyList.last().plane = mPolyPlaneList[index];
+}
+
+const PlaneF& ClippedPolyList::getIndexedPlane(const U32 index)
+{
+   AssertFatal(index < mPolyPlaneList.size(), "Out of bounds index!");
+   return mPolyPlaneList[index];
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::vertex(U32 vi)
+{
+   mIndexList.push_back(vi);
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::end()
+{
+   Poly& poly = mPolyList.last();
+
+   // Anything facing away from the mNormal is rejected
+   if (mDot(poly.plane,mNormal) > 0) {
+      mIndexList.setSize(poly.vertexStart);
+      mPolyList.decrement();
+      return;
+   }
+
+   // Build initial inside/outside plane masks
+   U32 indexStart = poly.vertexStart;
+   U32 vertexCount = mIndexList.size() - indexStart;
+
+   U32 frontMask = 0,backMask = 0;
+   U32 i;
+   for (i = indexStart; i < mIndexList.size(); i++) {
+      U32 mask = mVertexList[mIndexList[i]].mask;
+      frontMask |= mask;
+      backMask |= ~mask;
+   }
+
+   // Trivial accept if all the vertices are on the backsides of
+   // all the planes.
+   if (!frontMask) {
+      poly.vertexCount = vertexCount;
+      return;
+   }
+
+   // Trivial reject if any plane not crossed has all it's points
+   // on the front.
+   U32 crossMask = frontMask & backMask;
+   if (~crossMask & frontMask) {
+      mIndexList.setSize(poly.vertexStart);
+      mPolyList.decrement();
+      return;
+   }
+
+   // Need to do some clipping
+   for (U32 p = 0; p < mPlaneList.size(); p++) {
+      U32 pmask = 1 << p;
+      // Only test against this plane if we have something
+      // on both sides
+      if (crossMask & pmask) {
+         U32 indexEnd = mIndexList.size();
+         U32 i1 = indexEnd - 1;
+         U32 mask1 = mVertexList[mIndexList[i1]].mask;
+
+         for (U32 i2 = indexStart; i2 < indexEnd; i2++) {
+            U32 mask2 = mVertexList[mIndexList[i2]].mask;
+            if ((mask1 ^ mask2) & pmask) {
+               //
+               mVertexList.increment();
+               VectorF& v1 = mVertexList[mIndexList[i1]].point;
+               VectorF& v2 = mVertexList[mIndexList[i2]].point;
+               VectorF vv = v2 - v1;
+               F32 t = -mPlaneList[p].distToPlane(v1) / mDot(mPlaneList[p],vv);
+
+               mIndexList.push_back(mVertexList.size() - 1);
+               Vertex& iv = mVertexList.last();
+               iv.point.x = v1.x + vv.x * t;
+               iv.point.y = v1.y + vv.y * t;
+               iv.point.z = v1.z + vv.z * t;
+               iv.mask = 0;
+
+               // Test against the remaining planes
+               for (U32 i = p + 1; i < mPlaneList.size(); i++)
+                  if (mPlaneList[i].distToPlane(iv.point) > 0) {
+                     iv.mask = 1 << i;
+                     break;
+                  }
+            }
+            if (!(mask2 & pmask)) {
+               U32 index = mIndexList[i2];
+               mIndexList.push_back(index);
+            }
+            mask1 = mask2;
+            i1 = i2;
+         }
+
+         // Check for degenerate
+         indexStart = indexEnd;
+         if (mIndexList.size() - indexStart < 3) {
+            mIndexList.setSize(poly.vertexStart);
+            mPolyList.decrement();
+            return;
+         }
+      }
+   }
+
+   // Emit what's left and compress the index list.
+   poly.vertexCount = mIndexList.size() - indexStart;
+   memcpy(&mIndexList[poly.vertexStart],
+      &mIndexList[indexStart],poly.vertexCount);
+   mIndexList.setSize(poly.vertexStart + poly.vertexCount);
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::memcpy(U32* dst, U32* src,U32 size)
+{
+   U32* end = src + size;
+   while (src != end)
+      *dst++ = *src++;
+}
+
+
+//----------------------------------------------------------------------------
+
+void ClippedPolyList::render()
+{
+   glVertexPointer(3,GL_FLOAT,sizeof(Vertex),mVertexList.address());
+   glEnableClientState(GL_VERTEX_ARRAY);
+   glColor4f(1,0,0,0.25);
+   glEnable(GL_BLEND);
+   glDisable(GL_CULL_FACE);
+   glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+
+   Poly * p;
+   for (p = mPolyList.begin(); p < mPolyList.end(); p++) {
+      glDrawElements(GL_POLYGON,p->vertexCount,
+         GL_UNSIGNED_INT,&mIndexList[p->vertexStart]);
+   }
+
+   glColor3f(0.6,0.6,0.6);
+   glDisable(GL_BLEND);
+   for (p = mPolyList.begin(); p < mPolyList.end(); p++) {
+      glDrawElements(GL_LINE_LOOP,p->vertexCount,
+         GL_UNSIGNED_INT,&mIndexList[p->vertexStart]);
+   }
+
+   glDisableClientState(GL_VERTEX_ARRAY);
+}