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/*
** File: step0.c
** Description: Renders a GLUT teapot.
** Demonstrates aspects of lighting.
** Rev: 1.0
** Created: 07 September 2002
** Last Update: 08 September 2002
** Author: Fran Soddell
** Email: F.Soddell@bendigo.latrobe.edu.au
*/
#include <GL/glut.h>
#define TRUE 1
#define FALSE 0
/*
** manage 3D
*/
enum {x,y,z};
/*
** manage window
*/
int width =400;
int height=400;
int xPosition=50;
int yPosition=70;
/*
** manage world projection
*/
enum {xLeft,xRight,yBottom,yTop,zNear,zFar};
GLdouble world[]={
-2.0,2.0,-2.0,2.0,1,1000
};
GLdouble fovy =60.0;
GLdouble aspect =1.0;
int perspective =TRUE;
/*
** manage camera
*/
GLdouble eye[]={
0.0,0.0,4.0
};
GLdouble centre[]={
0.0,0.0,0.0
};
GLdouble up[]={
0.0,1.0,0.0
};
/*
** manage colour
*/
#define NUM_COLOURS 8
#define ALPHA 0.0
enum {red,green,blue,
yellow,magenta,cyan,
white,black};
typedef GLfloat colourType[4];
colourType colour[NUM_COLOURS]={
{1.0,0.0,0.0,1.0},{0.0,1.0,0.0,1.0},{0.0,0.0,1.0,1.0},
{1.0,1.0,0.0,1.0},{1.0,0.0,1.0,1.0},{0.0,1.0,1.0,1.0},
{1.0,1.0,1.0,1.0},{0.0,0.0,0.0,1.0}
};
/*
** manage model
*/
int wireframe=FALSE;
/*
** manage model transforms
*/
GLdouble ra=0;
GLdouble r[]={0,1,0};
/*
** ***********************************************************
** code
** ***********************************************************
*/
void renderView(){
glColor3fv(colour[red]);
glRotated(ra,r[x],r[y],r[z]);
if(wireframe)
glutWireTeapot(1.0);
else
glutSolidTeapot(1.0);
}
void setCamera(){
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(eye[x], eye[y],eye[z],
centre[x],centre[y],centre[z],
up[x],up[y],up[z]);
}
void display(){
setCamera();
glClear(GL_COLOR_BUFFER_BIT);
renderView();
glutSwapBuffers();
}
void setProjection(){
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(!perspective)
glOrtho(world[xLeft], world[xRight],
world[yBottom],world[yTop],
world[zNear], world[zFar]);
else
gluPerspective(fovy,1,world[zNear],world[zFar]);
}
void reshapeWindow(int w, int h){
int yOrigin=0, xOrigin=0;
if(w>h){
yOrigin=(h-w)/2;
h=w;
}
else{
xOrigin=(w-h)/2;
w=h;
}
glViewport(xOrigin,yOrigin,(GLsizei)w,(GLsizei)h);
setProjection();
}
void keyboard(unsigned char key,int xMouse,int yMouse){
switch(key){
case 27 : exit(0);
case 'p': perspective=!perspective;
setProjection(); break;
case 'r': ra+=1;
if(ra>=360)ra=0; break;
case 'w': wireframe=!wireframe; break;
}
glutPostRedisplay();
}
void setUpGLUT(int argc,char ** argv){
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutInitWindowSize(width,height);
glutInitWindowPosition(xPosition,yPosition);
glutCreateWindow("Light Step 0");
/*
** Register callbacks.
*/
glutDisplayFunc(display);
glutReshapeFunc(reshapeWindow);
glutKeyboardFunc(keyboard);
}
void initialiseGL(){
int i;
glClearColor(0,0,0,ALPHA);
}
int main(int argc,char ** argv){
setUpGLUT(argc,argv);
initialiseGL();
/*
** Display window and enter the GLUT event
** processing loop.
*/
glutMainLoop();
return 0;
}
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