Configure all of the CL_MeshEntities* meshes the same, the material flags decide...

[xonotic/darkplaces.git] / polygon.c

diff --git a/polygon.c b/polygon.c
index 8133dce3dbd0e99d26dbf705a0b63498c723b12c..99ceb0b9d7680abecec324bd44d4d66429aaa013 100644 (file)
--- a/polygon.c
+++ b/polygon.c
@@ -9,7 +9,7 @@ Polygon clipping routines written by Forest Hale and placed into public domain.
 void PolygonF_QuadForPlane(float *outpoints, float planenormalx, float planenormaly, float planenormalz, float planedist, float quadsize)
 {
        float d, quadright[3], quadup[3];
-       if (planenormalz > planenormalx && planenormalz > planenormaly)
+       if (fabs(planenormalz) > fabs(planenormalx) && fabs(planenormalz) > fabs(planenormaly))
        {
                quadup[0] = 1;
                quadup[1] = 0;
@@ -25,10 +25,10 @@ void PolygonF_QuadForPlane(float *outpoints, float planenormalx, float planenorm
        d = -(quadup[0] * planenormalx + quadup[1] * planenormaly + quadup[2] * planenormalz);
        // VectorMA(quadup, d, planenormal, quadup);
        quadup[0] += d * planenormalx;
-       quadup[1] += d * planenormalx;
-       quadup[2] += d * planenormalx;
+       quadup[1] += d * planenormaly;
+       quadup[2] += d * planenormalz;
        // VectorNormalize(quadup);
-       d = 1.0 / sqrt(quadup[0] * quadup[0] + quadup[1] * quadup[1] + quadup[2] * quadup[2]);
+       d = (float)(1.0 / sqrt(quadup[0] * quadup[0] + quadup[1] * quadup[1] + quadup[2] * quadup[2]));
        quadup[0] *= d;
        quadup[1] *= d;
        quadup[2] *= d;
@@ -54,7 +54,7 @@ void PolygonF_QuadForPlane(float *outpoints, float planenormalx, float planenorm
 void PolygonD_QuadForPlane(double *outpoints, double planenormalx, double planenormaly, double planenormalz, double planedist, double quadsize)
 {
        double d, quadright[3], quadup[3];
-       if (planenormalz > planenormalx && planenormalz > planenormaly)
+       if (fabs(planenormalz) > fabs(planenormalx) && fabs(planenormalz) > fabs(planenormaly))
        {
                quadup[0] = 1;
                quadup[1] = 0;
@@ -70,8 +70,8 @@ void PolygonD_QuadForPlane(double *outpoints, double planenormalx, double planen
        d = -(quadup[0] * planenormalx + quadup[1] * planenormaly + quadup[2] * planenormalz);
        // VectorMA(quadup, d, planenormal, quadup);
        quadup[0] += d * planenormalx;
-       quadup[1] += d * planenormalx;
-       quadup[2] += d * planenormalx;
+       quadup[1] += d * planenormaly;
+       quadup[2] += d * planenormalz;
        // VectorNormalize(quadup);
        d = 1.0 / sqrt(quadup[0] * quadup[0] + quadup[1] * quadup[1] + quadup[2] * quadup[2]);
        quadup[0] *= d;
@@ -96,18 +96,20 @@ void PolygonD_QuadForPlane(double *outpoints, double planenormalx, double planen
        outpoints[11] = planedist * planenormalz - quadsize * quadright[2] - quadsize * quadup[2];
 }
 
-void PolygonF_Divide(unsigned int innumpoints, const float *inpoints, float planenormalx, float planenormaly, float planenormalz, float planedist, float epsilon, unsigned int outfrontmaxpoints, float *outfrontpoints, unsigned int *neededfrontpoints, unsigned int outbackmaxpoints, float *outbackpoints, unsigned int *neededbackpoints)
+int PolygonF_Clip(int innumpoints, const float *inpoints, float planenormalx, float planenormaly, float planenormalz, float planedist, float epsilon, int outfrontmaxpoints, float *outfrontpoints)
 {
-       unsigned int i, frontcount, backcount;
+       int i, frontcount = 0;
        const float *n, *p;
        float frac, pdist, ndist;
-       frontcount = 0;
-       backcount = 0;
-       p = inpoints + (innumpoints - 1) * 3;
+       if (innumpoints < 1)
+               return 0;
        n = inpoints;
-       pdist = p[0] * planenormalx + p[1] * planenormaly + p[2] * planenormalz - planedist;
-       for (i = 0;i < innumpoints;i++)
+       ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
+       for(i = 0;i < innumpoints;i++)
        {
+               p = n;
+               pdist = ndist;
+               n = inpoints + ((i + 1) < innumpoints ? (i + 1) : 0) * 3;
                ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
                if (pdist >= -epsilon)
                {
@@ -119,16 +121,6 @@ void PolygonF_Divide(unsigned int innumpoints, const float *inpoints, float plan
                        }
                        frontcount++;
                }
-               if (pdist <= epsilon)
-               {
-                       if (backcount < outbackmaxpoints)
-                       {
-                               *outbackpoints++ = p[0];
-                               *outbackpoints++ = p[1];
-                               *outbackpoints++ = p[2];
-                       }
-                       backcount++;
-               }
                if ((pdist > epsilon && ndist < -epsilon) || (pdist < -epsilon && ndist > epsilon))
                {
                        frac = pdist / (pdist - ndist);
@@ -139,36 +131,25 @@ void PolygonF_Divide(unsigned int innumpoints, const float *inpoints, float plan
                                *outfrontpoints++ = p[2] + frac * (n[2] - p[2]);
                        }
                        frontcount++;
-                       if (backcount < outbackmaxpoints)
-                       {
-                               *outbackpoints++ = p[0] + frac * (n[0] - p[0]);
-                               *outbackpoints++ = p[1] + frac * (n[1] - p[1]);
-                               *outbackpoints++ = p[2] + frac * (n[2] - p[2]);
-                       }
-                       backcount++;
                }
-               p = n;
-               n += 3;
-               pdist = ndist;
        }
-       if (neededfrontpoints)
-               *neededfrontpoints = frontcount;
-       if (neededbackpoints)
-               *neededbackpoints = backcount;
+       return frontcount;
 }
 
-void PolygonD_Divide(unsigned int innumpoints, const double *inpoints, double planenormalx, double planenormaly, double planenormalz, double planedist, double epsilon, unsigned int outfrontmaxpoints, double *outfrontpoints, unsigned int *neededfrontpoints, unsigned int outbackmaxpoints, double *outbackpoints, unsigned int *neededbackpoints)
+int PolygonD_Clip(int innumpoints, const double *inpoints, double planenormalx, double planenormaly, double planenormalz, double planedist, double epsilon, int outfrontmaxpoints, double *outfrontpoints)
 {
-       unsigned int i, frontcount, backcount;
+       int i, frontcount = 0;
        const double *n, *p;
        double frac, pdist, ndist;
-       frontcount = 0;
-       backcount = 0;
-       p = inpoints + (innumpoints - 1) * 3;
+       if (innumpoints < 1)
+               return 0;
        n = inpoints;
-       pdist = p[0] * planenormalx + p[1] * planenormaly + p[2] * planenormalz - planedist;
-       for (i = 0;i < innumpoints;i++)
+       ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
+       for(i = 0;i < innumpoints;i++)
        {
+               p = n;
+               pdist = ndist;
+               n = inpoints + ((i + 1) < innumpoints ? (i + 1) : 0) * 3;
                ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
                if (pdist >= -epsilon)
                {
@@ -180,16 +161,6 @@ void PolygonD_Divide(unsigned int innumpoints, const double *inpoints, double pl
                        }
                        frontcount++;
                }
-               if (pdist <= epsilon)
-               {
-                       if (backcount < outbackmaxpoints)
-                       {
-                               *outbackpoints++ = p[0];
-                               *outbackpoints++ = p[1];
-                               *outbackpoints++ = p[2];
-                       }
-                       backcount++;
-               }
                if ((pdist > epsilon && ndist < -epsilon) || (pdist < -epsilon && ndist > epsilon))
                {
                        frac = pdist / (pdist - ndist);
@@ -200,21 +171,140 @@ void PolygonD_Divide(unsigned int innumpoints, const double *inpoints, double pl
                                *outfrontpoints++ = p[2] + frac * (n[2] - p[2]);
                        }
                        frontcount++;
-                       if (backcount < outbackmaxpoints)
+               }
+       }
+       return frontcount;
+}
+
+void PolygonF_Divide(int innumpoints, const float *inpoints, float planenormalx, float planenormaly, float planenormalz, float planedist, float epsilon, int outfrontmaxpoints, float *outfrontpoints, int *neededfrontpoints, int outbackmaxpoints, float *outbackpoints, int *neededbackpoints, int *oncountpointer)
+{
+       int i, frontcount = 0, backcount = 0, oncount = 0;
+       const float *n, *p;
+       float frac, pdist, ndist;
+       if (innumpoints)
+       {
+               n = inpoints;
+               ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
+               for(i = 0;i < innumpoints;i++)
+               {
+                       p = n;
+                       pdist = ndist;
+                       n = inpoints + ((i + 1) < innumpoints ? (i + 1) : 0) * 3;
+                       ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
+                       if (pdist >= -epsilon)
+                       {
+                               if (pdist <= epsilon)
+                                       oncount++;
+                               if (frontcount < outfrontmaxpoints)
+                               {
+                                       *outfrontpoints++ = p[0];
+                                       *outfrontpoints++ = p[1];
+                                       *outfrontpoints++ = p[2];
+                               }
+                               frontcount++;
+                       }
+                       if (pdist <= epsilon)
                        {
-                               *outbackpoints++ = p[0] + frac * (n[0] - p[0]);
-                               *outbackpoints++ = p[1] + frac * (n[1] - p[1]);
-                               *outbackpoints++ = p[2] + frac * (n[2] - p[2]);
+                               if (backcount < outbackmaxpoints)
+                               {
+                                       *outbackpoints++ = p[0];
+                                       *outbackpoints++ = p[1];
+                                       *outbackpoints++ = p[2];
+                               }
+                               backcount++;
+                       }
+                       if ((pdist > epsilon && ndist < -epsilon) || (pdist < -epsilon && ndist > epsilon))
+                       {
+                               oncount++;
+                               frac = pdist / (pdist - ndist);
+                               if (frontcount < outfrontmaxpoints)
+                               {
+                                       *outfrontpoints++ = p[0] + frac * (n[0] - p[0]);
+                                       *outfrontpoints++ = p[1] + frac * (n[1] - p[1]);
+                                       *outfrontpoints++ = p[2] + frac * (n[2] - p[2]);
+                               }
+                               frontcount++;
+                               if (backcount < outbackmaxpoints)
+                               {
+                                       *outbackpoints++ = p[0] + frac * (n[0] - p[0]);
+                                       *outbackpoints++ = p[1] + frac * (n[1] - p[1]);
+                                       *outbackpoints++ = p[2] + frac * (n[2] - p[2]);
+                               }
+                               backcount++;
+                       }
+               }
+       }
+       if (neededfrontpoints)
+               *neededfrontpoints = frontcount;
+       if (neededbackpoints)
+               *neededbackpoints = backcount;
+       if (oncountpointer)
+               *oncountpointer = oncount;
+}
+
+void PolygonD_Divide(int innumpoints, const double *inpoints, double planenormalx, double planenormaly, double planenormalz, double planedist, double epsilon, int outfrontmaxpoints, double *outfrontpoints, int *neededfrontpoints, int outbackmaxpoints, double *outbackpoints, int *neededbackpoints, int *oncountpointer)
+{
+       int i = 0, frontcount = 0, backcount = 0, oncount = 0;
+       const double *n, *p;
+       double frac, pdist, ndist;
+       if (innumpoints)
+       {
+               n = inpoints;
+               ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
+               for(i = 0;i < innumpoints;i++)
+               {
+                       p = n;
+                       pdist = ndist;
+                       n = inpoints + ((i + 1) < innumpoints ? (i + 1) : 0) * 3;
+                       ndist = n[0] * planenormalx + n[1] * planenormaly + n[2] * planenormalz - planedist;
+                       if (pdist >= -epsilon)
+                       {
+                               if (pdist <= epsilon)
+                                       oncount++;
+                               if (frontcount < outfrontmaxpoints)
+                               {
+                                       *outfrontpoints++ = p[0];
+                                       *outfrontpoints++ = p[1];
+                                       *outfrontpoints++ = p[2];
+                               }
+                               frontcount++;
+                       }
+                       if (pdist <= epsilon)
+                       {
+                               if (backcount < outbackmaxpoints)
+                               {
+                                       *outbackpoints++ = p[0];
+                                       *outbackpoints++ = p[1];
+                                       *outbackpoints++ = p[2];
+                               }
+                               backcount++;
+                       }
+                       if ((pdist > epsilon && ndist < -epsilon) || (pdist < -epsilon && ndist > epsilon))
+                       {
+                               oncount++;
+                               frac = pdist / (pdist - ndist);
+                               if (frontcount < outfrontmaxpoints)
+                               {
+                                       *outfrontpoints++ = p[0] + frac * (n[0] - p[0]);
+                                       *outfrontpoints++ = p[1] + frac * (n[1] - p[1]);
+                                       *outfrontpoints++ = p[2] + frac * (n[2] - p[2]);
+                               }
+                               frontcount++;
+                               if (backcount < outbackmaxpoints)
+                               {
+                                       *outbackpoints++ = p[0] + frac * (n[0] - p[0]);
+                                       *outbackpoints++ = p[1] + frac * (n[1] - p[1]);
+                                       *outbackpoints++ = p[2] + frac * (n[2] - p[2]);
+                               }
+                               backcount++;
                        }
-                       backcount++;
                }
-               p = n;
-               n += 3;
-               pdist = ndist;
        }
        if (neededfrontpoints)
                *neededfrontpoints = frontcount;
        if (neededbackpoints)
                *neededbackpoints = backcount;
+       if (oncountpointer)
+               *oncountpointer = oncount;
 }