std::vector::size with glDrawElements crashes?
- by NoobScratcher
( win32 / OpenGL 3.3 / GLSL 330 )
I decided after a long time of trying to do a graphical user interface using just opengl graphics to go back to a gui toolkit and so in the process have had to port alot of my code to win32.
But I have a problem with my glDrawElement function.
my program compiles and runs fine until it gets to glDrawElements then crashes.. which is rather annoying right.
so I was trying to figure out why and I found out its std::vector::size member not returning the correct amount of faces in the unsigned interger vector eg, "vector<unsigned int>faces; "
so when I use cout << faces.size() << endl;
I got 68 elements????
instead of 24 as you can see here in this .obj file:
# Blender v2.61 (sub 0) OBJ File: ''
# www.blender.org
v 1.000000 -1.000000 -1.000000
v 1.000000 -1.000000 1.000000
v -1.000000 -1.000000 1.000000
v -1.000000 -1.000000 -1.000000
v 1.000000 1.000000 -0.999999
v 0.999999 1.000000 1.000001
v -1.000000 1.000000 1.000000
v -1.000000 1.000000 -1.000000
s off
f 1 2 3 4
f 5 8 7 6
f 1 5 6 2
f 2 6 7 3 <--- 24 Faces not 68?
f 3 7 8 4
f 5 1 4 8
I'm using a parser I created to get the faces/vertexes in my .obj file:
char modelbuffer [20000];
int MAX_BUFF = 20000;
unsigned int face[3];
FILE * pfile;
pfile = fopen(szFileName, "rw");
while(fgets(modelbuffer, MAX_BUFF, pfile) != NULL)
{
if('v')
{
Point p;
sscanf(modelbuffer, "v %f %f %f", &p.x, &p.y, &p.z);
points.push_back(p);
cout << " p.x = " << p.x << " p.y = " << p.y << " p.z = " << p.x << endl;
}
if('f')
{
sscanf(modelbuffer, "f %d %d %d %d", &face[0], &face[1], &face[2], &face[3]);
cout << "face[0] = " << face[0] << " face[1] = " << face[1] << " face[2] = " << face[2] << " face[3] = " << face[3] << "\n";
faces.push_back(face[0] - 1);
faces.push_back(face[1] - 1);
faces.push_back(face[2] - 1);
faces.push_back(face[3] - 1);
cout << face[0] - 1 << face[1] - 1 << face[2] - 1 << face[3] - 1 << endl;
}
}
using this struct to store the x,y,z positions also this vector was used with Point:
vector<Point>points;
struct Point
{
float x, y, z;
};
If someone could tell me why its not working and how to fix it that would be awesome I also provide a pastebin to the full source code if you want a closer look.
http://pastebin.com/gznYLVw7
