Why doesn't this work?
- by user146780
I'v tried to solve a memory leak in the GLU callback by creating a global variable but now it dos not draw anything:
GLdouble *gluptr = NULL;
void CALLBACK combineCallback(GLdouble coords[3], GLdouble *vertex_data[4],
GLfloat weight[4], GLdouble **dataOut)
{
GLdouble *vertex;
if(gluptr == NULL)
{
gluptr = (GLdouble *) malloc(6 * sizeof(GLdouble));
}
vertex = (GLdouble*)gluptr;
vertex[0] = coords[0];
vertex[1] = coords[1];
vertex[2] = coords[2];
for (int i = 3; i < 6; i++)
{
vertex[i] = weight[0] * vertex_data[0][i] +
weight[1] * vertex_data[0][i] +
weight[2] * vertex_data[0][i] +
weight[3] * vertex_data[0][i];
}
*dataOut = vertex;
}
basically instead of doing malloc each time in the loop (thus the memory leak) im using a global pointer, but this doesn't work (drawing to the screen). Why would using malloc to a pointer created in the function work any different than a global variable?
Thanks
