#include <GL/gl.h>
#include <GL/glut.h>
#include <stdio.h>

struct logger_point {
        float x,y,z;
        struct { unsigned char r, g, b, a; } c;
} p[] = {
        {0,0,0, {255,255,255,0}},
        {1,0,0, {255,255,255,0}},
};

void display(void) {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_VERTEX_ARRAY);
    printf("A: glGetError() -> "); printf("%d\n", glGetError());
    glVertexPointer(3, GL_FLOAT, sizeof(struct logger_point), &p[0].x);
    printf("B: glGetError() -> "); printf("%d\n", glGetError());
    glColorPointer(3, GL_UNSIGNED_BYTE, sizeof(struct logger_point), &p[0].c);
    printf("C: glGetError() -> "); printf("%d\n", glGetError());
    glDrawArrays(GL_LINE_STRIP, 0, 2);
    printf("D: glGetError() -> "); printf("%d\n", glGetError());
    glutSwapBuffers();
}

int main(int argc, char** argv)
{
  // GLUT Window Initialization:
  glutInit (&argc, argv);
  glutInitWindowSize (400, 300);
  glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
  glutCreateWindow ("GLUT example");

  // Register callbacks:
  glutDisplayFunc (display);

  // Turn the flow of control over to GLUT
  glutMainLoop ();
  return 0;
}