/** * Test display list corner cases. */ #include <stdio.h> #include <stdlib.h> #include <math.h> #include <GL/glut.h> static int Win; static GLfloat Xrot = 0, Yrot = 0, Zrot = 0; static GLboolean Anim = GL_FALSE; static GLuint List1 = 0, List2 = 0; static void Idle(void) { Xrot += 3.0; Yrot += 4.0; Zrot += 2.0; glutPostRedisplay(); } static void Draw(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(Xrot, 1, 0, 0); glRotatef(Yrot, 0, 1, 0); glRotatef(Zrot, 0, 0, 1); glCallList(List1); glCallList(List2); glPopMatrix(); glutSwapBuffers(); } static void Reshape(int width, int height) { glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -15.0); } static void Key(unsigned char key, int x, int y) { const GLfloat step = 3.0; (void) x; (void) y; switch (key) { case 'a': Anim = !Anim; if (Anim) glutIdleFunc(Idle); else glutIdleFunc(NULL); break; case 'z': Zrot -= step; break; case 'Z': Zrot += step; break; case 27: glutDestroyWindow(Win); exit(0); break; } glutPostRedisplay(); } static void SpecialKey(int key, int x, int y) { const GLfloat step = 3.0; (void) x; (void) y; switch (key) { case GLUT_KEY_UP: Xrot -= step; break; case GLUT_KEY_DOWN: Xrot += step; break; case GLUT_KEY_LEFT: Yrot -= step; break; case GLUT_KEY_RIGHT: Yrot += step; break; } glutPostRedisplay(); } static void Init(void) { /* List1: start of primitive */ List1 = glGenLists(1); glNewList(List1, GL_COMPILE); glBegin(GL_POLYGON); glVertex2f(-1, -1); glVertex2f( 1, -1); glEndList(); /* List2: end of primitive */ List2 = glGenLists(1); glNewList(List2, GL_COMPILE); glVertex2f( 1, 1); glVertex2f(-1, 1); glEnd(); glEndList(); glEnable(GL_DEPTH_TEST); } int main(int argc, char *argv[]) { glutInit(&argc, argv); glutInitWindowPosition(0, 0); glutInitWindowSize(400, 400); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); Win = glutCreateWindow(argv[0]); glutReshapeFunc(Reshape); glutKeyboardFunc(Key); glutSpecialFunc(SpecialKey); glutDisplayFunc(Draw); if (Anim) glutIdleFunc(Idle); Init(); glutMainLoop(); return 0; }