#include"glut.h"
typedef GLfloat point3[3];
//point3 data[32][4][4];
/* 306 vertices */
void display(void);
void drawPanel(point3 a, point3 b, point3 c, point3 d);
void reshape(int w, int h);
/* 32 patches each defined by 16 vertices, arranged in a 4 x 4 array */
/* NOTE: numbering scheme for teapot has vertices labeled from 1 to 306 */
/* remnent of the days of FORTRAN */
main(int argc, char *argv[])
{
/* Standard GLUT initialization */
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
glutInitWindowSize(500, 500); /* 500 x 500 pixel window */
glutInitWindowPosition(0,0); /* place window top left on display */
glutCreateWindow("3d House with grass and sky background"); /* window title */
glEnable(GL_DEPTH_TEST);
glClearColor(1.0, 1.0, 1.0, 1.0); /* draw on white background */
glColor3f(0.0, 1.0, 0.0); /* draw in black */
glutDisplayFunc(display); /* display callback invoked when window is opened */
glutReshapeFunc(reshape);
glutMainLoop(); /* enter event loop */
}
void display(void)
{
/* HOUSE - as a cube */
point3 hCube[8] = {
{0.4,-0.4,0.0}, {0.4,0.4,0.0},
{-0.4,0.4,0.0}, {-0.4,-0.4,0.0},
{-0.4,-0.4,-0.8}, {-0.4,0.4,-0.8},
{0.4,0.4,-0.8}, {0.4,-0.4,-0.8}};
/* House roof points */
point3 hRoof[2] = {
{0.0,0.6,0.0}, {0.0,0.6,-0.8}};
/* Grass ground */
point3 grass[8] = {
{2.0,0.0,0.0}, {2.0,0.0,-2.0},
{-2.0,0.0,-2.0}, {-2.0,0.0,0.0}};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
/* house */
glTranslatef(0.0,0.0,-2.0);
glColor3f(1.0, 0.0, 0.0);
drawPanel(hCube[0],hCube[1],hCube[2],hCube[3]);//f wall
glColor3f(1.0, 0.1, 0.0);
drawPanel(hCube[3],hCube[2],hCube[5],hCube[4]);//l wall
glColor3f(1.0, 0.2, 0.0);
drawPanel(hCube[7],hCube[6],hCube[1],hCube[0]);//b wall
glColor3f(1.0, 0.3, 0.0);
drawPanel(hCube[4],hCube[5],hCube[6],hCube[7]);//r wall
glColor3f(1.0, 0.4, 0.0);
drawPanel(hCube[2],hRoof[0],hRoof[1],hCube[5]);//l roof
glColor3f(1.0, 0.5, 0.0);
drawPanel(hCube[6],hRoof[1],hRoof[0],hCube[1]);//r roof
/* grass */
glColor3f(0.0,1.0,0.0);
drawPanel(grass[0],grass[1],grass[2],grass[3]);
glFlush();
}
/* A function to draw a panel. Requires pointer to a valid point3 array. */
void drawPanel(point3 a, point3 b, point3 c, point3 d)
{
glBegin(GL_POLYGON);
glVertex3fv(a);
glVertex3fv(b);
glVertex3fv(c);
glVertex3fv(d);
glEnd();
}
void reshape(int w, int h)
{
float ratio;
// Prevent a divide by zero, when window is too short
// (you cant make a window of zero width).
if (h == 0)
h = 1;
ratio = 1.0* w / h;
// Reset the coordinate system before modifying
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// Set the viewport to be the entire window
glViewport(0, 0, w, h);
// Set the correct perspective.
gluPerspective(60,ratio,0.1,1000);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
/* First 3: camera position. second3: point we're looking at, third 3: tilt */
gluLookAt(0.0,0.0,0.0,
0.0,0.0,-1.0,
0.0f,1.0f,0.0f);
}
