static void Draw(void)
{
+ float z = 1.0;
+
glClearColor(0.0, 0.0, 1.0, 0.0);
glClearDepth(1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glColor3f(0,0,.7);
- glVertex3f( 0.9, -0.9, 1.0);
+ glVertex3f( 0.9, -0.9, z);
glColor3f(.8,0,0);
- glVertex3f( 0.9, 0.9, 1.0);
+ glVertex3f( 0.9, 0.9, z);
glColor3f(0,.9,0);
- glVertex3f(-0.9, 0.0, 1.0);
+ glVertex3f(-0.9, 0.0, z);
glEnd();
glFlush();
+ {
+ GLfloat z;
+ glReadPixels(125, 125, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &z);
+ printf("Z at (125, 125) = %f\n", z);
+ }
+
if (doubleBuffer) {
glutSwapBuffers();
}