Компьютер графикаси

Masala 2: OpenGL yoritish modeli

1. Ushbu dastur OpenGL modelini ishlatishda oddiy sahna orqali tor, kub, konus va shardan tuzilgan bo‘ladi. Obyekt qilib har xil materiallarni olamiz. Albatta sahnada yorug‘lik manbai bo‘ladi.
#include
#include

/*tor materialining parametrlari*/

float mat1_dif[]={0.8f,0.8f,0.0f};
float mat1_amb[]= {0.2f,0.2f,0.2f};
float mat1_spec[]={0.6f,0.6f,0.6f};
float mat1_shininess=0.5f*128;

/* kub materialining parametrlari */

float mat2_dif[]={0.2f,0.6f,0.0f,0.0f};
float mat2_amb[]= {0.4f,0.4f,0.2f,0.0f};
float mat2_spec[]={0.4f,0.6f,0.4f,0.0f};
float mat2_shininess=0.3f*128;

/* shar materialining parametrlari */

float mat3_dif[]={0.9f,0.2f,0.0f};
float mat3_amb[]= {0.2f,0.2f,0.2f};
float mat3_spec[]={0.6f,0.6f,0.6f};
float mat3_shininess=0.1f*128;

/* konus materialining parametrlari */

float mat4_dif[]={0.0f,0.0f,0.8f};
float mat4_amb[]= {0.2f,0.2f,0.2f};
float mat4_spec[]={0.6f,0.6f,0.6f};
float mat4_shininess=0.7f*128;

/* yorug‘lik manbai va materiallar parametrlarini inisiallashtirish */

void init (void)
{
GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };

/* yorug‘lik manbaining parametrlarini o‘rnatish */

glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv (GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv (GL_LIGHT0, GL_POSITION, light_position);

/* yorug‘lik manbai va yoritgichni qo‘shish va yoqish */

glEnable (GL_LIGHTING);
glEnable (GL_LIGHT0);

/* z-buferni yoqamiz*/

glEnable(GL_DEPTH_TEST);
}

/* Tasvirlarni chizish uchun kerak bo‘ladigan funksiyani chaqirish. Unda barcha geometrik shakllarni chiqarish amalga oshiriladi. */

void display (void)
{
/* kadr buferi va chuqurlik buferini tozalash*/
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix ();

glRotatef (45.0, 1.0, 0.0, 0.0);

/* tor tasviri*/

glMaterialfv (GL_FRONT,GL_AMBIENT,mat1_amb);
glMaterialfv (GL_FRONT,GL_DIFFUSE,mat1_dif);
glMaterialfv (GL_FRONT,GL_SPECULAR,mat1_spec);
glMaterialf (GL_FRONT,GL_ShININESS,mat1_shininess);

glPushMatrix ();

glTranslatef (-0.75, 0.5, 0.0);
glRotatef (90.0, 1.0, 0.0, 0.0);
glutSolidTorus (0.275, 0.85, 15, 15);
glPopMatrix ();

/*kub tasviri */

glMaterialfv (GL_FRONT,GL_AMBIENT,mat2_amb);
glMaterialfv (GL_FRONT,GL_DIFFUSE,mat2_dif);
glMaterialfv (GL_FRONT,GL_SPECULAR,mat2_spec);
glMaterialf (GL_FRONT,GL_ShININESS,mat2_shininess);

glPushMatrix();

glTranslatef(1,-0.5,1);
glRotatef(901, 1.0, 0.0, 0.0);
glutSolidCube(1);
glPopMatrix();

/* shar tasviri */

glMaterialfv (GL_FRONT,GL_AMBIENT,mat3_amb);
glMaterialfv (GL_FRONT,GL_DIFFUSE,mat3_dif);
glMaterialfv (GL_FRONT,GL_SPECULAR,mat3_spec);
glMaterialf (GL_FRONT,GL_ShININESS,mat3_shininess);

glPushMatrix ();

glTranslatef (0.75, 0.0, -1.0);
glutSolidSphere (1.0, 25, 25);
glPopMatrix ();

/*konus tasviri */

glMaterialfv (GL_FRONT,GL_AMBIENT,mat4_amb);
glMaterialfv (GL_FRONT,GL_DIFFUSE,mat4_dif);
glMaterialfv (GL_FRONT,GL_SPECULAR,mat4_spec);
glMaterialf (GL_FRONT,GL_ShININESS,mat4_shininess);

glPushMatrix ();

glTranslatef (-0.75, -0.5, 0.0);
glRotatef (270.0, 1.0, 0.0, 0.0);
glutSolidCone (1.0, 2.0, 15, 15);
glPopMatrix ();
glPopMatrix ();
/*ekranga sa?nani chi?arish */
glFlush ();
}
/* foydalanuvchi tomonidan chaqiriladigan oyna o‘lchamlarini o‘zgartiruvchi funksiya */
void reshape(int w, int h)
{
/* oyna o‘lchamiga teng bo‘lgan chiqarish sohasi o‘lchamini o‘rnatish */
glViewport (0, 0, (GLsizei) w, (GLsizei) h);

/* oyna o‘lchamini hisobga olib proeksiyalar matritsasini beramiz */

glMatrixMode (GL_PROJECTION);
glLoadIdentity ();

gluPerspective(

40.0, /* gradusda berilgan ko‘rish burchagi */
(GLfloat)w/h, /*oynaning siqilish koeffisienti */
1,100.0); /*tekislik kesimigacha masofa*/
glMatrixMode (GL_MODELVIEW);

glLoadIdentity ();

gluLookAt(
0.0f,0.0f,8.0f, /* kamera holati */
0.0f,0.0f,0.0f, /* sahnalar markazi */
0.0f,1.0f,0.0f); /* y o‘qining musbat yo‘nalishi*/
}

/* klaviaturadagi klavishlarni bosganda chaqiriladigan funksiya */

void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 27: /* escape */
exit(0);
break;
}
}

/* Ilovaning asosiy tsikli.

* Chuqurlik buferi bilan ekran rejimi o‘rnatiladi, oyna yaratiladi. */
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB
| GLUT_DEPTH);
glutInitWindowSize (500, 500);
glutCreateWindow (argv[0]);
init ();
glutReshapeFunc (reshape);
glutDisplayFunc (display);
glutKeyboardFunc (keyboard);
glutMainLoop();
return 0;
}