void display(void){
glClear(GL_COLOR_BUFFER_BIT);
if(leftFirst){
drawLeftTriangle();
drawRightTriangle();
} else {
drawRightTriangle();
drawLeftTriangle();
}
glFlush();
}
void qblending::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT);
if (leftFirst) {
drawLeftTriangle();
drawRightTriangle();
}
else {
drawRightTriangle();
drawLeftTriangle();
}
glFlush();
}
void display(UGWindow uwin)
{
glClear(GL_COLOR_BUFFER_BIT);
if (leftFirst) {
drawLeftTriangle();
drawRightTriangle();
}
else {
drawRightTriangle();
drawLeftTriangle();
}
glFlush();
ugSwapBuffers(uwin);
}
void display(void)
{
printf("GL_CLEAR_DEPTH = %f GL_DEPTH_FUNC = %s\n",
clearVal, funcs[curFunc].str);
glClearDepth(clearVal);
glDepthFunc(funcs[curFunc].func);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (leftFirst) {
drawLeftTriangle();
drawRightTriangle();
}
else {
drawRightTriangle();
drawLeftTriangle();
}
glFlush();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.5f, 0.5f, 0.5f, 1.0f); // Clear the background of our window to red
if (rotateY){
rotateY = !rotateY;
glRotatef(yRotationAngle, 0.0f, 1.0f, 0.0f); // Rotate our object around the y axis
yRotationAngle += 0.05f;
if (yRotationAngle > 360.0f) // If we have rotated beyond 360 degrees (a full rotation)
yRotationAngle -= 360.0f; // Subtract 360 degrees off of our rotation
}
if (translateZ){
translateZ = !translateZ;
glLoadIdentity(); // Load the Identity Matrix to reset our drawing locations
glTranslatef(zLocation, 0.0f, 0.0f); // Translate our object along the y axis
zLocation += 0.05f;
if (zLocation > 1.0f){ // If we have rotated beyond 360 degrees (a full rotation)
zLocation = 0.0f;
glLoadIdentity(); // Load the Identity Matrix to reset our drawing locations
glTranslatef(0.0f, 0.0f, 0.0f); // Translate our object along the y axis
}
}
if (leftFirst) {
drawLeftTriangle();
drawRightTriangle();
}
else {
drawRightTriangle();
drawLeftTriangle();
}
glFlush();
}
/* Main triangle drawing function */
void endTriangle() {
vertex* b; vertex* t; vertex* m;
int flag = 0x0; /* bit flags for tests */
int A,B,C; /* implcit line coefficients */
/* First, figure out which vertex should be
b (bottom vertex), t (top vertex) and m (middle vertex) */
if (v[0]->y < v[1]->y) flag = 0x1;
flag <<= 1; /* shift over one bit */
if (v[1]->y < v[2]->y) flag |= 0x1;
flag <<= 1;
if (v[2]->y < v[0]->y) flag |= 0x1;
switch (flag) {
case 0x1: /* 001 */
t = v[0]; m = v[1]; b = v[2];
break;
case 0x2: /* 010 */
m = v[0]; b = v[1]; t = v[2];
break;
case 0x3: /* 011 */
t = v[0]; b = v[1]; m = v[2];
break;
case 0x4: /* 100 */
b = v[0]; t = v[1]; m = v[2];
break;
case 0x5: /* 101 */
m = v[0]; t = v[1]; b = v[2];
break;
case 0x6: /* 110 */
b = v[0]; m = v[1]; t = v[2];
break;
default:
printf("Bad triangle! \n"); /* only gets here if all vertices equal */
return;
}
/* Now test to see if m is right or left of line bt */
/* Use implicit line equation */
A = b->y - t->y;
B = t->x - b->x;
C = b->x * t->y - t->x * b->y;
if (A*m->x + B*m->y + C > 0)
drawLeftTriangle(b,t,m);
else
drawRightTriangle(b,t,m);
free(v[0]);
free(v[1]);
free(v[2]);
}
