From 520124c1be9d8089af9efdea7a6170bac3c86938 Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Tue, 26 Feb 2002 20:05:20 +0000
Subject: [PATCH] Add initial support for per vertex or per object colors.

---
 simgear/io/sg_binobj.cxx | 56 +++++++++++++++++++++++++++++++++++++++-
 simgear/io/sg_binobj.hxx |  4 +++
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/simgear/io/sg_binobj.cxx b/simgear/io/sg_binobj.cxx
index 404bf101..4e7d2b26 100644
--- a/simgear/io/sg_binobj.cxx
+++ b/simgear/io/sg_binobj.cxx
@@ -49,6 +49,7 @@ enum {
     SG_BOUNDING_SPHERE = 0,
 
     SG_VERTEX_LIST = 1,
+    SG_COLOR_LIST = 4,
     SG_NORMAL_LIST = 2,
     SG_TEXCOORD_LIST = 3,
 
@@ -312,6 +313,41 @@ bool SGBinObject::read_bin( const string& file ) {
 		    fptr += 3;
 		}
 	    }
+	} else if ( obj_type == SG_COLOR_LIST ) {
+	    // read color list properties
+	    for ( j = 0; j < nproperties; ++j ) {
+		char prop_type;
+		sgReadChar( fp, &prop_type );
+
+		sgReadUInt( fp, &nbytes );
+		// cout << "property size = " << nbytes << endl;
+		if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
+		char *ptr = buf.get_ptr();
+		sgReadBytes( fp, nbytes, ptr );
+	    }
+
+	    // read color list elements
+	    for ( j = 0; j < nelements; ++j ) {
+		sgReadUInt( fp, &nbytes );
+		// cout << "element size = " << nbytes << endl;
+		if ( nbytes > buf.get_size() ) { buf.resize( nbytes ); }
+		char *ptr = buf.get_ptr();
+		sgReadBytes( fp, nbytes, ptr );
+		int count = nbytes / (sizeof(float) * 4);
+		float *fptr = (float *)ptr;
+		for ( k = 0; k < count; ++k ) {
+		    if ( sgIsBigEndian() ) {
+			sgEndianSwap( (unsigned int *)&(fptr[0]) );
+			sgEndianSwap( (unsigned int *)&(fptr[1]) );
+			sgEndianSwap( (unsigned int *)&(fptr[2]) );
+			sgEndianSwap( (unsigned int *)&(fptr[3]) );
+		    }
+		    p = Point3D( fptr[0], fptr[1], fptr[2] );
+		    // cout << "node = " << p << endl;
+		    colors.push_back( p );
+		    fptr += 4;
+		}
+	    }
 	} else if ( obj_type == SG_NORMAL_LIST ) {
 	    // read normal list properties
 	    for ( j = 0; j < nproperties; ++j ) {
@@ -600,6 +636,7 @@ bool SGBinObject::write_bin( const string& base, const string& name,
     Point3D p;
     sgVec2 t;
     sgVec3 pt;
+    sgVec4 color;
     int i, j;
 
     string dir = base + "/" + b.gen_base_path();
@@ -630,7 +667,9 @@ bool SGBinObject::write_bin( const string& base, const string& name,
     cout << "fans size = " << fans_v.size() << "  fan_materials = " 
 	 << fan_materials.size() << endl;
 
-    cout << "points = " << wgs84_nodes.size() << endl;
+    cout << "nodes = " << wgs84_nodes.size() << endl;
+    cout << "colors = " << colors.size() << endl;
+    cout << "normals = " << normals.size() << endl;
     cout << "tex coords = " << texcoords.size() << endl;
 
     // write header magic
@@ -645,6 +684,7 @@ bool SGBinObject::write_bin( const string& base, const string& name,
     short nobjects = 0;
     nobjects++;			// for gbs
     nobjects++;			// for vertices
+    nobjects++;			// for colors
     nobjects++;			// for normals
     nobjects++;			// for texcoords
 
@@ -729,6 +769,20 @@ bool SGBinObject::write_bin( const string& base, const string& name,
 	sgWriteVec3( fp, pt );
     }
 
+    // dump vertex color list
+    sgWriteChar( fp, (char)SG_COLOR_LIST );             // type
+    sgWriteShort( fp, 0 );		                 // nproperties
+    sgWriteShort( fp, 1 );		                 // nelements
+    sgWriteUInt( fp, colors.size() * sizeof(float) * 4 ); // nbytes
+    for ( i = 0; i < (int)colors.size(); ++i ) {
+	p = colors[i];
+        // Right now we have a place holder for color alpha but we
+        // need to update the interface so the calling program can
+        // provide the info.
+	sgSetVec4( color, p.x(), p.y(), p.z(), 1.0 );
+	sgWriteVec4( fp, color );
+    }
+
     // dump vertex normal list
     sgWriteChar( fp, (char)SG_NORMAL_LIST );            // type
     sgWriteShort( fp, 0 );		                // nproperties
diff --git a/simgear/io/sg_binobj.hxx b/simgear/io/sg_binobj.hxx
index bd76ac6a..b8f181ad 100644
--- a/simgear/io/sg_binobj.hxx
+++ b/simgear/io/sg_binobj.hxx
@@ -92,6 +92,7 @@ class SGBinObject {
     Point3D gbs_center;
     float gbs_radius;
     point_list wgs84_nodes;
+    point_list colors;
     point_list normals;
     point_list texcoords;
     group_list pts_v;
@@ -119,6 +120,9 @@ public:
     inline point_list get_wgs84_nodes() const { return wgs84_nodes; }
     inline void set_wgs84_nodes( point_list n ) { wgs84_nodes = n; }
 
+    inline point_list get_colors() const { return colors; }
+    inline void set_colors( point_list c ) { colors = c; }
+
     inline point_list get_normals() const { return normals; }
     inline void set_normals( point_list n ) { normals = n; }
 
-- 
2.39.5