void DrawGLScene(void)
{
double stretch,height,position,rotation;
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
glLoadIdentity();
gluLookAt(5.0, 5.0, 20.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
position=cos((double)frame*speed)*2;
height=fabs(sin((double)frame*speed)*10)+1;
rotation=cos((double)frame*speed)*90;
stretch=1+0.3*sin((double)frame*speed/2);
if(useMyTransformations) {
if(doTranslate) myTranslatef(position,height-5,0.0);
if(doRotate) myRotatef(rotation,0.2,0.6,0.77);
if(doScale) myScalef(1/sqrt(stretch),stretch,1/sqrt(stretch));
} else {
if(doTranslate) glTranslatef(position,height-5,0.0);
if(doRotate) glRotatef(rotation,0.2,0.6,0.77);
if(doScale) glScalef(1/sqrt(stretch),stretch,1/sqrt(stretch));
}
//drawCube();
drawTeapot();
frame++;
glutSwapBuffers();
}
void drawPolys(void) {
myMatrixMode(GL_MODELVIEW);
myScalef(50.0,50.0);
drawHouse();
myPopMatrix();
myTranslatef(-50.0,0.0);
myScalef(30.0,30.0);
drawHouse();
myPopMatrix();
myTranslatef(0.0,-100.0);
myScalef(40.0,40.0);
drawHouse();
glFlush();
}
void displayCallback( ){
const float centerPosition[] = {0.0, 0.0, 0.0};
float viewingTransform[16];
float modelingTransform[16];
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
myLookAt( viewingTransform,
eyePosition[0], eyePosition[1], eyePosition[2],
centerPosition[0], centerPosition[1], centerPosition[2],
upVector[0], upVector[1], upVector[2], camZ
);
// Set light & material properties for the teapot;
// lights are transformed by current modelview matrix
// such that they are positioned correctly in the scene.
matMultVec4f( light0, light0_position, viewingTransform );
matMultVec4f( light1, light1_position, viewingTransform );
matMultVec4f( light2, light2_position, viewingTransform );
matMultVec4f( light3, light3_position, viewingTransform );
shaderProgram_A->activate( );
activateUniforms_A( );
glLoadIdentity( );
glMultMatrixf(viewingTransform);
myScalef(modelingTransform,
teapotScale_A[0], teapotScale_A[1], teapotScale_A[2]);
glMultMatrixf(modelingTransform);
myTranslatef(modelingTransform,
teapotTranslation_A[0],
teapotTranslation_A[1],
teapotTranslation_A[2]);
glMultMatrixf(modelingTransform);
_glutSolidTeapot(1.3);
shaderProgram_B->activate( );
activateUniforms_B( );
glLoadIdentity( );
glMultMatrixf(viewingTransform);
myTranslatef(modelingTransform,
teapotTranslation_B[0],
teapotTranslation_B[1],
teapotTranslation_B[2]);
glMultMatrixf(modelingTransform);
_glutSolidTeapot(1.3);
glutSwapBuffers();
}
void display( void ) {
/*
* Set clear color to gray
*/
myClearColor ( 0.8, 0.8, 0.8, 0.0 );
/*
* Clear screen window
*/
myClear( GL_COLOR_BUFFER_BIT );
myLoadIdentity();
myPushMatrix();
/*
* plain old polygon test
*/
if ( (displayNumber % 4) == 1) {
/* default clipping */
myOrtho2D( -100.0, 100.0, -100.0, 100.0 );
/* default viewport */
myViewport( 0, 0, screenWidth, screenHeight );
myPushMatrix();
/* draw the polys */
drawPolys();
}
else if ( (displayNumber % 4) == 2) {
/* clipping test */
myOrtho2D( -65.0, 75.0, -80.0, 65.0 );
/* default viewport */
myViewport( 0, 0, screenWidth, screenHeight );
/* flip screen around! */
myScalef(-1.0,1.0);
myPushMatrix();
/* draw the polys */
drawPolys();
}
else if ( (displayNumber % 4) == 3) {
/* default clipping */
myOrtho2D( -100.0, 100.0, -100.0, 100.0 );
/* default viewport */
myViewport( 0, 0, screenWidth, screenHeight );
/* rotate screen */
myRotatef(15.0);
myPushMatrix();
/* draw the tranformed polys */
drawPolys();
}
else /* displayNumber == 0 */ {
/* default clipping */
myOrtho2D( -100.0, 100.0, -100.0, 100.0 );
/* default viewport */
myViewport( 0, 0, screenWidth, screenHeight );
myRotatef(-15.0);
myScalef(.5,.5);
myPushMatrix();
myRotatef(15.0);
myPushMatrix();
/* draw the tranformed polys */
drawPolys();
}
/*
* Flush GL buffers to the display
*/
glFlush( );
}
