void redraw(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glPushMatrix();
drawXform(&xform, TRUE);
glEnable(GL_STENCIL_TEST);
if(whichSurface < 2)
glStencilFunc(GL_EQUAL, whichSurface, 0xff);
else
glStencilFunc(GL_ALWAYS, 0, 0);
glutSolidTorus(2, 4, 20, 20);
/* glDisable(GL_STENCIL_TEST); */
/* glDisable(GL_LIGHTING); */
/* glColor3f(1, 1, 1); */
/* glutWireTorus(2, 4, 20, 20); */
/* glEnable(GL_LIGHTING); */
glPopMatrix();
switch(bufferInterest) {
case COLOR:
break; /* color already in back buffer */
case STENCIL:
copyStencilToColor(GL_BACK);
break;
case DEPTH:
copyDepthToColor(GL_BACK);
break;
}
if(takeSnapshot) {
takeSnapshot = 0;
/* saveSGIImage("snap.rgb", FALSE); */
/* printf("Saved RGBA image in snap.rgba\n"); */
}
glutSwapBuffers();
}
void redraw(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/* Only need this if you care to look at the stencil buffer */
if(dataChoice == STENCIL)
glClear(GL_STENCIL_BUFFER_BIT);
glPushMatrix();
glScalef(.5, .5, .5);
if(stage == 1)
goto doneWithFrame;
setupLight();
setupNormalDrawingState();
glPushMatrix();
glTranslatef(0, 1, 4);
glRotatef(135, 0, 1, 0);
drawAirplane();
glPopMatrix();
if(stage == 2)
goto doneWithFrame;
setupBasePolygonState(3); /* 2 decals */
drawGround();
if(stage == 3)
goto doneWithFrame;
setupDecalState(1); /* decal # 1 = the runway asphalt */
drawAsphalt();
if(stage == 4)
goto doneWithFrame;
setupDecalState(2); /* decal # 2 = yellow paint on the runway */
drawStripes();
if(stage == 5)
goto doneWithFrame;
setupDecalState(3); /* decal # 3 = the plane's shadow */
glDisable(GL_LIGHTING);
glEnable(GL_BLEND);
glPushMatrix();
glColor4f(0, 0, 0, .5);
glTranslatef(0, 0, 4);
glRotatef(135, 0, 1, 0);
glScalef(1, 0, 1);
drawAirplane();
glPopMatrix();
glDisable(GL_BLEND);
glEnable(GL_LIGHTING);
doneWithFrame:
setupNormalDrawingState();
glPopMatrix();
switch(dataChoice) {
case COLOR:
break; /* color already in back buffer */
case STENCIL:
copyStencilToColor(GL_BACK);
break;
case DEPTH:
copyDepthToColor(GL_BACK);
break;
}
glutSwapBuffers();
}