GTSchoolShit/CS4451/oglexamples/cubes.c

#ifdef _WIN32
#include <windows.h>
#endif
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>

/*  Create checkerboard texture  */
#define checkImageWidth 128
#define checkImageHeight 128
static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
static GLuint texName;

void makeCheckImage(void)
{
   int i, j, c;
   
   for (i = 0; i < checkImageHeight; i++) {
      for (j = 0; j < checkImageWidth; j++) {
         c = ((((i&0x8)==0)^((j&0x8)==0)))*255;
         checkImage[i][j][0] = (GLubyte) c;
         checkImage[i][j][1] = (GLubyte) c;
         checkImage[i][j][2] = (GLubyte) c;
         checkImage[i][j][3] = (GLubyte) 255;
      }
   }
}

void init(void)
{   
        GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat mat_shininess[] = { 50.0 };

        glClearColor (0.0, 0.0, 0.0, 0.0);
        glShadeModel(GL_FLAT);
        glEnable(GL_DEPTH_TEST);
        glDepthFunc(GL_LEQUAL);

        /* texture stuff */
        makeCheckImage();

        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
        glGenTextures(1, &texName);
        glBindTexture(GL_TEXTURE_2D, texName);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage);

        /* lighting stuff */
        glShadeModel (GL_SMOOTH);
 
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
        glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
}

 

void display(void)
{
        GLfloat mat_green[] = {0.0, 1.0, 0.0, 0.0};
        GLfloat mat_blue[]  = {0.0, 0.0, 1.0, 0.0};
        GLfloat light_position[] = {10.0, 10.0, 10.0, 0.0};

        /* this will be your shadow matrix.  You need to specify what this contains.
         * OpenGL has a funky ordering for rows and columns
         * use this ordering for rows and columns
         */

        GLfloat m[16];

        m[0]= 1; m[4]= 0; m[8] = 0; m[12]= 0;
        m[1]= 0; m[5]= 1; m[9] = 0; m[13]= 0;
        m[2]= 0; m[6]= 0; m[10]= 0; m[14]= 0;
        m[3]= 0; m[7]= 0; m[11]= 0; m[15]= 1;

        glLoadIdentity();
        gluLookAt(10,0,5, 0,0,0, 0,0,1);
        glLightfv(GL_LIGHT0, GL_POSITION, light_position);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

        /* draw checkered floor */
        glEnable(GL_TEXTURE_2D);
        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
        glBindTexture(GL_TEXTURE_2D, texName);
        glBegin(GL_QUADS);

               /* z=-0.01 so that the floor doesn't overlap your shadows */

               glTexCoord2f(0.0, 0.0); glVertex3f(-4.0, -4.0, -0.01);
               glTexCoord2f(0.0, 1.0); glVertex3f(-4.0,  4.0, -0.01);
               glTexCoord2f(1.0, 1.0); glVertex3f( 4.0,  4.0, -0.01);
               glTexCoord2f(1.0, 0.0); glVertex3f( 4.0, -4.0, -0.01);

        glEnd();
        glFlush();

        glDisable(GL_TEXTURE_2D);
 
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
        /* draw cubes */
        /* scale translate and draw blue cube */
        glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_blue);
        glPushMatrix();
        glTranslatef(2.5, 2.5, 0);     // translate cube front and right.
        glScalef(0.5, 0.5, 3);            // scale to be narrow and tall
        glTranslatef(0,0,0.5);            // translate unit cube to surface
        glutSolidCube(1);                    // draw unit cube
        glPopMatrix();

 

        /* scale rotate and draw green cube */
        glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_green);
        glPushMatrix();
        glTranslatef(0, -3, 0.5);       // translate to left side and up so that it is on the surface
        glRotatef(90, 1, 0, 0);          // rotate to its side
        glScalef(0.5, 0.5, 3);            // scale to be narrow and tall
        glutSolidCube(1);                    // draw unit cube
        glPopMatrix();

		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);


        /* apply a matrix 'm' to a cone w/o scaling, rotation, or projection */
        /* the matrix is wrong, so don't expect this to work */
        glDisable(GL_LIGHTING);          // so that OpenGL doesn't shade your shadows.
        glColor3f(0.0, 0.0, 0.0);       // shadow color
       
        glPushMatrix();
        glMultMatrixf(m);                    // apply transform of matrix m
        /* draw cubes */
        /* scale translate and draw blue cube */
        glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_blue);
        glPushMatrix();
        glTranslatef(2.5, 2.5, 0);     // translate cube front and right.
        glScalef(0.5, 0.5, 3);            // scale to be narrow and tall
        glTranslatef(0,0,0.5);            // translate unit cube to surface
        glutSolidCube(1);                    // draw unit cube
        glPopMatrix();

 

        /* scale rotate and draw green cube */
        glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_green);
        glPushMatrix();
        glTranslatef(0, -3, 0.5);       // translate to left side and up so that it is on the surface
        glRotatef(90, 1, 0, 0);          // rotate to its side
        glScalef(0.5, 0.5, 3);            // scale to be narrow and tall
        glutSolidCube(1);                    // draw unit cube
        glPopMatrix();      
		
		glPopMatrix();
        
        glEnable(GL_LIGHTING);            // enable lighting for future calls to display()
        glFlush();
}

void reshape(int w, int h)
{
   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   gluPerspective(30.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}

 

void keyboard (unsigned char key, int x, int y)
{
   switch (key) {
      case 'q':
         exit(0);
         break;

      default:
         break;
   }
}
 

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
   glutInitWindowSize(500, 500);
   glutInitWindowPosition(100, 100);
   glutCreateWindow(argv[0]);
   init();

   glutDisplayFunc(display);
   glutReshapeFunc(reshape);
   glutKeyboardFunc(keyboard);

   glutMainLoop();

   return EXIT_SUCCESS;
}