Question

I’m using the following code to draw a green line at some specified coordinates

GLfloat colors[] = {0,1,0,1, 0,1,0,0.5};        
CGPoint v[] = {{p1.x, p1.y}, {p2.x, p2.y}};                

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_LINE_SMOOTH);

glLineWidth(10);
glVertexPointer(2, GL_FLOAT, 0, &v);
glColorPointer(4, GL_FLOAT, 0, &colors);
glDrawArrays(GL_LINE_LOOP, 0, 2);

glDisableClientState(GL_LINE_SMOOTH);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);

The problem is that once in a while even if the draw method gets called, the line turns black or does not get drawn entirely. i’ve checked the coordinates i pass and they seem fine.
Is there something that i’m missing?

Answer 1

GL_LINE_SMOOTH has never been an acceptable argument to glEnableClientState().