From: curt <curt>
Date: Fri, 16 Jun 2000 00:28:19 +0000 (+0000)
Subject: Math/bucket/tiling updates contributed by Norman Vine.
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=2ed07850c616705695f2add269d187f981f8d09d;p=simgear.git

Math/bucket/tiling updates contributed by Norman Vine.
Texture coordinate calculation updates by Curt.
---

diff --git a/simgear/bucket/newbucket.hxx b/simgear/bucket/newbucket.hxx
index 64677680..9aff115b 100644
--- a/simgear/bucket/newbucket.hxx
+++ b/simgear/bucket/newbucket.hxx
@@ -73,7 +73,7 @@ private:
     int y;          // y subdivision (0 to 7)
 
 public:
-    
+
     // default constructor
     FGBucket();
 
@@ -90,6 +90,10 @@ public:
 
     // Set the bucket params for the specified lat and lon
     void set_bucket( double dlon, double dlat );
+    void set_bucket( double *lonlat ) {
+	set_bucket( lonlat[0], lonlat[1] );
+    }	
+
     void make_bad ( void );
 
     // Generate the unique scenery tile index for this bucket
@@ -227,7 +231,7 @@ inline FGBucket::FGBucket(const bool is_good) {
 	lon = -1000;
     }
 }
-    
+
 
 // Parse a unique scenery tile index and find the lon, lat, x, and y
 inline FGBucket::FGBucket(const long int bindex) {
@@ -236,11 +240,11 @@ inline FGBucket::FGBucket(const long int bindex) {
     lon = index >> 14;
     index -= lon << 14;
     lon -= 180;
-    
+
     lat = index >> 6;
     index -= lat << 6;
     lat -= 90;
-    
+
     y = index >> 3;
     index -= y << 3;
 
@@ -310,9 +314,9 @@ inline double FGBucket::get_height() const {
 // create an impossible bucket
 inline void FGBucket::make_bad( void ) {
     set_bucket(0.0, 0.0);
-	lon = -1000;
+    lon = -1000;
 }
-    
+
 
 // offset a bucket struct by the specified tile units in the X & Y
 // direction
@@ -323,12 +327,6 @@ FGBucket fgBucketOffset( double dlon, double dlat, int x, int y );
 void fgBucketDiff( const FGBucket& b1, const FGBucket& b2, int *dx, int *dy );
 
 
-/*
-// Given a lat/lon, fill in the local tile index array
-void fgBucketGenIdxArray(fgBUCKET *p1, fgBUCKET *tiles, int width, int height);
-*/
-
-
 inline ostream&
 operator<< ( ostream& out, const FGBucket& b )
 {
diff --git a/simgear/math/vector.cxx b/simgear/math/vector.cxx
index 75a0cb7a..7c6f2c3c 100644
--- a/simgear/math/vector.cxx
+++ b/simgear/math/vector.cxx
@@ -35,18 +35,13 @@ double sgPointLineDistSquared( const sgVec3 p, const sgVec3 p0,
 			       const sgVec3 d ) {
 
     sgVec3 u, u1, v;
-    double ud, dd, tmp;
     
     // u = p - p0
     sgSubVec3(u, p, p0);
 
     // calculate the projection, u1, of u along d.
     // u1 = ( dot_prod(u, d) / dot_prod(d, d) ) * d;
-    ud = sgScalarProductVec3(u, d);
-    dd = sgScalarProductVec3(d, d);
-    tmp = ud / dd;
-
-    sgScaleVec3(u1, d, tmp);;
+    sgScaleVec3( u1, d, sgScalarProductVec3(u,d) / sgScalarProductVec3(d,d) );
 
     // v = u - u1 = vector from closest point on line, p1, to the
     // original point, p.
@@ -81,3 +76,18 @@ double sgdPointLineDistSquared( const sgdVec3 p, const sgdVec3 p0,
 
     return ( sgdScalarProductVec3(v, v) );
 }
+
+
+// This is a quicker form of
+// sgMakeMatTrans4( sgMat4 sgTrans, sgVec3 trans )
+// sgPostMultMat4( sgMat, sgTRANS );
+void sgPostMultMat4ByTransMat4( sgMat4 src, const sgVec3 trans )
+{
+    for( int i=0; i<4; i++) {
+	for( int j=0; j<3; j++ ) {
+	    src[i][j] += (src[i][3] * trans[j]);
+	}
+    }
+}
+
+
diff --git a/simgear/math/vector.hxx b/simgear/math/vector.hxx
index f27f8b60..2d3feedc 100644
--- a/simgear/math/vector.hxx
+++ b/simgear/math/vector.hxx
@@ -83,6 +83,14 @@ inline void sgmap_vec_onto_cur_surface_plane( sgVec3 normal,
 }
 
 
+inline void sgCopyNegateVec4( sgVec4 dst, sgVec4 src )
+{
+	dst [ 0 ] = -src [ 0 ] ;
+	dst [ 1 ] = -src [ 1 ] ;
+	dst [ 2 ] = -src [ 2 ] ;
+	dst [ 3 ] = -src [ 3 ] ;
+}
+
 // Given a point p, and a line through p0 with direction vector d,
 // find the shortest distance (squared) from the point to the line
 double sgPointLineDistSquared( const sgVec3 p, const sgVec3 p0,
@@ -93,6 +101,10 @@ double sgPointLineDistSquared( const sgVec3 p, const sgVec3 p0,
 double sgdPointLineDistSquared( const sgdVec3 p, const sgdVec3 p0,
 				const sgdVec3 d );
 
+// This is same as
+// sgMakeMatTrans4( sgMat4 sgTrans, sgVec3 trans )
+// sgPostMultMat4( sgMat, sgTRANS );
+void sgPostMultMat4ByTransMat4( sgMat4 src, const sgVec3 trans );
 
 #endif // _VECTOR_HXX
 
diff --git a/simgear/misc/texcoord.cxx b/simgear/misc/texcoord.cxx
index 789fd9d9..983fd30c 100644
--- a/simgear/misc/texcoord.cxx
+++ b/simgear/misc/texcoord.cxx
@@ -113,17 +113,40 @@ point_list calc_tex_coords( const FGBucket& b, const point_list& geod_nodes,
     // cout << "dx = " << dx << " dy = " << dy << endl;
 
     bool do_shift = false;
-    Point3D mod_shift;
+    // Point3D mod_shift;
     if ( (dx > HALF_MAX_TEX_COORD) || (dy > HALF_MAX_TEX_COORD) ) {
 	// structure is too big, we'll just have to shift it so that
 	// tmin = (0,0).  This messes up subsequent texture scaling,
 	// but is the best we can do.
 	// cout << "SHIFTING" << endl;
 	do_shift = true;
-	tmin.setx( (double)( (int)tmin.x() + 1 ) );
-	tmin.sety( (double)( (int)tmin.y() + 1 ) );
+	if ( tmin.x() < 0 ) {
+	    tmin.setx( (double)( (int)tmin.x() - 1 ) );
+	} else {
+	    tmin.setx( (int)tmin.x() );
+	}
+	if ( tmin.y() < 0 ) {
+	    tmin.sety( (double)( (int)tmin.y() - 1 ) );
+	} else {
+	    tmin.sety( (int)tmin.y() );
+	}
 	// cout << "found tmin = " << tmin << endl;
     } else {
+	if ( tmin.x() < 0 ) {
+	    tmin.setx( ( (int)(tmin.x() / HALF_MAX_TEX_COORD) - 1 )
+		       * HALF_MAX_TEX_COORD );
+	} else {
+	    tmin.setx( ( (int)(tmin.x() / HALF_MAX_TEX_COORD) )
+		       * HALF_MAX_TEX_COORD );
+	}
+	if ( tmin.y() < 0 ) {
+	    tmin.sety( ( (int)(tmin.y() / HALF_MAX_TEX_COORD) - 1 )
+		       * HALF_MAX_TEX_COORD );
+	} else {
+	    tmin.sety( ( (int)(tmin.y() / HALF_MAX_TEX_COORD) )
+		       * HALF_MAX_TEX_COORD );
+	}
+#if 0
 	// structure is small enough ... we can mod it so we can
 	// properly scale the texture coordinates later.
 	// cout << "MODDING" << endl;
@@ -142,7 +165,7 @@ point_list calc_tex_coords( const FGBucket& b, const point_list& geod_nodes,
 	// At this point we know that the object is < 16 wide in
 	// texture coordinate space.  If the modulo of the tmin is >
 	// the mod of the tmax at this point, then we know that the
-	// starting tex coordinate for the tmin > 16 so we can shift
+	// starting tex coordinate for the tmax > 16 so we can shift
 	// everything down by 16 and get it within the 0-32 range.
 
 	if ( x1 > x2 ) {
@@ -156,7 +179,7 @@ point_list calc_tex_coords( const FGBucket& b, const point_list& geod_nodes,
 	} else {
 	    mod_shift.sety( 0.0 );
 	}
-
+#endif
 	// cout << "mod_shift = " << mod_shift << endl;
     }
 
@@ -169,8 +192,9 @@ point_list calc_tex_coords( const FGBucket& b, const point_list& geod_nodes,
 	t = basic_tex_coord( p, degree_width, degree_height, scale );
 	// cout << "second t = " << t << endl;
 
-	if ( do_shift ) {
-	    adjusted_t = t - tmin;
+	// if ( do_shift ) {
+	adjusted_t = t - tmin;
+#if 0
 	} else {
 	    adjusted_t.setx( fmod(t.x() + mod_shift.x(), MAX_TEX_COORD) );
 	    while ( adjusted_t.x() < 0 ) { 
@@ -182,7 +206,7 @@ point_list calc_tex_coords( const FGBucket& b, const point_list& geod_nodes,
 	    }
 	    // cout << "adjusted_t " << adjusted_t << endl;
 	}
-
+#endif
 	if ( adjusted_t.x() < FG_EPSILON ) {
 	    adjusted_t.setx( 0.0 );
 	}
diff --git a/simgear/misc/texcoord.hxx b/simgear/misc/texcoord.hxx
index 36c7c803..50d9945a 100644
--- a/simgear/misc/texcoord.hxx
+++ b/simgear/misc/texcoord.hxx
@@ -41,5 +41,3 @@ point_list calc_tex_coords( const FGBucket& b, const point_list& geod_nodes,
 
 
 #endif // _TEXCOORD_HXX
-
-