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Fixed a serious bug caused by not-quite-correct comment/white space eating

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which resulted in mismatched glBegin() glEnd() pairs, incorrect display lists,
and ugly display artifacts.
This commit is contained in:
curt 1998-09-03 21:27:03 +00:00
parent 8fe7595b7c
commit a5e70b27d8
1 changed files with 56 additions and 12 deletions
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68
Objects/obj.cxx
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@ -119,6 +119,8 @@ int fgObjLoad( const string& path, fgTILE *t) {
double (*nodes)[3];
fgPoint3d *center;
// printf("loading %s\n", path.c_str() );
// Attempt to open "path.gz" or "path"
fg_gzifstream in( path );
if ( ! in )
@ -144,13 +146,18 @@ int fgObjLoad( const string& path, fgTILE *t) {
StopWatch stopwatch;
stopwatch.start();
// ignore initial comments and blank lines. (priming the pump)
in.eat_comments();
while ( ! in.eof() )
{
// ignore comments and blank lines.
in.eat_comments();
string token;
in.stream() >> token;
// printf("token = %s\n", token.c_str() );
if ( token == "gbs" )
{
// reference point (center offset)
@ -202,6 +209,7 @@ int fgObjLoad( const string& path, fgTILE *t) {
// close out the previous structure and start the next
xglEnd();
xglEndList();
// printf("xglEnd(); xglEndList();\n");
// update fragment
fragment.display_list = display_list;
@ -212,8 +220,11 @@ int fgObjLoad( const string& path, fgTILE *t) {
in_fragment = 1;
}
// printf("start of fragment (usemtl)\n");
display_list = xglGenLists(1);
xglNewList(display_list, GL_COMPILE);
// printf("xglGenLists(); xglNewList();\n");
in_faces = 0;
// reset the existing face list
@ -253,6 +264,7 @@ int fgObjLoad( const string& path, fgTILE *t) {
// fgPrintf( FG_TERRAIN, FG_DEBUG, "(t) = ");
xglBegin(GL_TRIANGLE_STRIP);
// printf("xglBegin(tristrip) %d %d %d\n", n1, n2, n3);
odd = 1;
scale = 1.0;
@ -279,7 +291,7 @@ int fgObjLoad( const string& path, fgTILE *t) {
pp = calc_tex_coords(nodes[n3], center);
xglTexCoord2f(pp.lon, pp.lat);
// xglVertex3d(t->nodes[n3][0],t->nodes[n3][1],t->nodes[n3][2]);
xglVertex3dv(nodes[n3]);
xglVertex3dv(nodes[n3]);
} else {
// Shading model is "GL_FLAT" so calculate per face
// normals on the fly.
@ -308,11 +320,27 @@ int fgObjLoad( const string& path, fgTILE *t) {
// xglVertex3d(t->nodes[n3][0],t->nodes[n3][1],t->nodes[n3][2]);
xglVertex3dv(nodes[n3]);
}
// printf("some normals, texcoords, and vertices\n");
odd = 1 - odd;
last1 = n2;
last2 = n3;
// There can be three or four values
char c;
while ( in.get(c) )
{
if ( c == '\n' )
break; // only the one
if ( isdigit(c) )
{
in.putback(c);
in.stream() >> n4;
break;
}
}
if ( n4 > 0 ) {
fragment.add_face(n3, n2, n4);
@ -334,12 +362,14 @@ int fgObjLoad( const string& path, fgTILE *t) {
odd = 1 - odd;
last1 = n3;
last2 = n4;
// printf("a normal, texcoord, and vertex (4th)\n");
}
} else if ( token[0] == 'f' ) {
// unoptimized face
if ( !in_faces ) {
xglBegin(GL_TRIANGLES);
// printf("xglBegin(triangles)\n");
in_faces = 1;
}
@ -367,6 +397,7 @@ int fgObjLoad( const string& path, fgTILE *t) {
xglTexCoord2f(pp.lon, pp.lat);
// xglVertex3d(t->nodes[n3][0], t->nodes[n3][1], t->nodes[n3][2]);
xglVertex3dv(nodes[n3]);
// printf("some normals, texcoords, and vertices (tris)\n");
} else if ( token[0] == 'q' ) {
// continue a triangle strip
n1 = n2 = 0;
@ -400,7 +431,6 @@ int fgObjLoad( const string& path, fgTILE *t) {
if ( shading ) {
// Shading model is "GL_SMOOTH"
MAT3_SCALE_VEC(normal, normals[n1], scale);
xglNormal3dv(normal);
} else {
// Shading model is "GL_FLAT"
if ( odd ) {
@ -411,14 +441,15 @@ int fgObjLoad( const string& path, fgTILE *t) {
approx_normal);
}
MAT3_SCALE_VEC(normal, approx_normal, scale);
xglNormal3dv(normal);
}
xglNormal3dv(normal);
pp = calc_tex_coords(nodes[n1], center);
xglTexCoord2f(pp.lon, pp.lat);
// xglVertex3d(t->nodes[n1][0], t->nodes[n1][1], t->nodes[n1][2]);
xglVertex3dv(nodes[n1]);
// printf("a normal, texcoord, and vertex (4th)\n");
odd = 1 - odd;
last1 = last2;
last2 = n1;
@ -435,7 +466,6 @@ int fgObjLoad( const string& path, fgTILE *t) {
if ( shading ) {
// Shading model is "GL_SMOOTH"
MAT3_SCALE_VEC(normal, normals[n2], scale);
xglNormal3dv(normal);
} else {
// Shading model is "GL_FLAT"
if ( odd ) {
@ -446,13 +476,14 @@ int fgObjLoad( const string& path, fgTILE *t) {
nodes[n2], approx_normal);
}
MAT3_SCALE_VEC(normal, approx_normal, scale);
xglNormal3dv(normal);
}
xglNormal3dv(normal);
pp = calc_tex_coords(nodes[n2], center);
xglTexCoord2f(pp.lon, pp.lat);
// xglVertex3d(t->nodes[n2][0],t->nodes[n2][1],t->nodes[n2][2]);
xglVertex3dv(nodes[n2]);
// printf("a normal, texcoord, and vertex (4th)\n");
odd = 1 -odd;
last1 = last2;
@ -462,15 +493,17 @@ int fgObjLoad( const string& path, fgTILE *t) {
fgPrintf( FG_TERRAIN, FG_WARN, "Unknown token in %s = %s\n",
path.c_str(), token.c_str() );
}
// eat comments and blank lines before start of while loop so
// if we are done with useful input it is noticed before hand.
in.eat_comments();
}
stopwatch.stop();
fgPrintf( FG_TERRAIN, FG_INFO, "Loaded %s in %f seconds\n",
path.c_str(), stopwatch.elapsedSeconds() );
if ( in_fragment ) {
// close out the previous structure and start the next
xglEnd();
xglEndList();
// printf("xglEnd(); xglEndList();\n");
// update fragment
fragment.display_list = display_list;
@ -494,11 +527,22 @@ int fgObjLoad( const string& path, fgTILE *t) {
xglEnd();
*/
stopwatch.stop();
fgPrintf( FG_TERRAIN, FG_INFO, "Loaded %s in %f seconds\n",
path.c_str(), stopwatch.elapsedSeconds() );
// printf("end of tile\n");
return(1);
}
// $Log$
// Revision 1.3 1998/09/03 21:27:03 curt
// Fixed a serious bug caused by not-quite-correct comment/white space eating
// which resulted in mismatched glBegin() glEnd() pairs, incorrect display lists,
// and ugly display artifacts.
//
// Revision 1.2 1998/09/01 19:03:09 curt
// Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
// - The new classes in libmisc.tgz define a stream interface into zlib.