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//
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// This code was created by Jeff Molofee '99 (ported to Linux/GLUT by Richard Campbell '99)
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//
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// If you've found this code useful, please let me know.
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//
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// Visit me at www.demonews.com/hosted/nehe
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// (email Richard Campbell at ulmont@bellsouth.net)
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//
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#include <GL/glut.h> // Header File For The GLUT Library
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#include <GL/gl.h> // Header File For The OpenGL32 Library
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#include <GL/glu.h> // Header File For The GLu32 Library
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#include <unistd.h> // Header File For sleeping.
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#include <stdio.h>
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/* ASCII code for the escape key. */
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#define ESCAPE 27
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#define PAGE_UP 73
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#define PAGE_DOWN 81
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#define UP_ARROW 72
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#define DOWN_ARROW 80
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#define LEFT_ARROW 75
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#define RIGHT_ARROW 77
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/* The number of our GLUT window */
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int window;
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float xrot = 0.0f;
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float yrot = 0.0f;
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/* A general OpenGL initialization function. Sets all of the initial parameters. */
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void InitGL(int Width, int Height) // We call this right after our OpenGL window is created.
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{
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
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glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
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glDepthFunc(GL_LESS); // The Type Of Depth Test To Do
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glEnable(GL_DEPTH_TEST); // Enables Depth Testing
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glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity(); // Reset The Projection Matrix
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gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window
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glMatrixMode(GL_MODELVIEW);
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}
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/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */
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void ReSizeGLScene(int Width, int Height)
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{
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if (Height==0) // Prevent A Divide By Zero If The Window Is Too Small
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Height=1;
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glViewport(0, 0, Width, Height); // Reset The Current Viewport And Perspective Transformation
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);
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glMatrixMode(GL_MODELVIEW);
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}
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/* The main drawing function. */
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void DrawGLScene()
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
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glLoadIdentity(); // Reset The View
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glTranslatef(0.0f,0.0f,-6.0f); // Move Left 1.5 Units And Into The Screen 6.0
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glRotatef(xrot, 1.0f, 0.0f, 0.0f);
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glRotatef(yrot, 0.0f, 1.0f, 0.0f);
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// draw a square (quadrilateral)
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glBegin(GL_QUADS); // start drawing a polygon (4 sided)
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/* --- Top --- */
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glColor3f( 1.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Front
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glColor3f( 1.0f, 1.0f, 1.0f);
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glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Front
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glColor3f( 1.0f, 0.0f, 1.0f);
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glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Back
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glColor3f( 1.0f, 0.0f, 0.0f);
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glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Back
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/* --- Left Side --- */
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glColor3f( 0.0f, 0.0f, 0.0f);
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glVertex3f(-1.0f,-1.0f,-1.0f); // Left Side Bottom Back
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glColor3f( 0.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f,-1.0f, 1.0f); // Left Side Bottom Front
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glColor3f( 1.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f, 1.0f, 1.0f); // Left Side Top Front
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glColor3f( 1.0f, 0.0f, 0.0f);
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glVertex3f(-1.0f, 1.0f,-1.0f); // Left Side Top Back
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/* --- Right Side --- */
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glColor3f( 0.0f, 0.0f, 1.0f);
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glVertex3f( 1.0f,-1.0f,-1.0f); // Right Side Bottom Back
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glColor3f( 0.0f, 1.0f, 1.0f);
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glVertex3f( 1.0f,-1.0f, 1.0f); // Right Side Bottom Front
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glColor3f( 1.0f, 1.0f, 1.0f);
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glVertex3f( 1.0f, 1.0f, 1.0f); // Right Side Top Front
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glColor3f( 1.0f, 0.0f, 1.0f);
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glVertex3f( 1.0f, 1.0f,-1.0f); // Right Side Top Back
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/* --- Back Side --- */
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glColor3f( 0.0f, 0.0f, 1.0f);
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glVertex3f( 1.0f,-1.0f,-1.0f); // Back Right Side Bottom
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glColor3f( 0.0f, 0.0f, 0.0f);
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glVertex3f(-1.0f,-1.0f,-1.0f); // Back Left Side Bottom
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glColor3f( 1.0f, 0.0f, 0.0f);
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glVertex3f(-1.0f, 1.0f,-1.0f); // Back Left Side Top
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glColor3f( 1.0f, 0.0f, 1.0f);
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glVertex3f( 1.0f, 1.0f,-1.0f); // Back Right Side Top
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/* --- Front --- */
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glColor3f( 0.0f, 1.0f, 1.0f);
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glVertex3f( 1.0f,-1.0f, 1.0f); // Front Right Side Bottom
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glColor3f( 0.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f,-1.0f, 1.0f); // Front Left Side Bottom
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glColor3f( 1.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f, 1.0f, 1.0f); // Front Left Side Top
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glColor3f( 1.0f, 1.0f, 1.0f);
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glVertex3f( 1.0f, 1.0f, 1.0f); // Front Right Side Top
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/* --- Bottom --- */
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glColor3f( 0.0f, 0.0f, 0.0f);
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glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Back
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glColor3f( 0.0f, 0.0f, 1.0f);
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glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Back
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glColor3f( 0.0f, 1.0f, 1.0f);
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glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Front
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glColor3f( 0.0f, 1.0f, 0.0f);
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glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Front
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glEnd(); // done with the polygon
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// swap buffers to display, since we're double buffered.
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glutSwapBuffers();
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}
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void rota()
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glRotatef(5,1,0.5,0.8);
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DrawGLScene();
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glFlush();
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glutTimerFunc(10.0, &rota, 5);
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}
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/* The function called whenever a key is pressed. */
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void keyPressed(unsigned char key, int x, int y)
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{
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/* avoid thrashing this procedure */
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usleep(100);
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switch (key)
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{
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case 'f': glutFullScreen();
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break;
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case 'w': glutReshapeWindow(640,480);
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break;
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case 27: glutDestroyWindow(window);
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exit(0);
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default:
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break;
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}
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}
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void specialKeyPressed(int key, int x, int y)
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{
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/* avoid thrashing this procedure */
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usleep(100);
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switch (key)
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{
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case GLUT_KEY_UP:
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xrot += 10;
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break;
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case GLUT_KEY_DOWN:
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xrot -= 10;
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break;
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case GLUT_KEY_LEFT:
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yrot += 10;
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break;
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case GLUT_KEY_RIGHT:
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yrot -= 10;
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break;
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default:
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break;
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}
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}
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int main(int argc, char **argv)
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{
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/* Initialize GLUT state - glut will take any command line arguments that pertain to it or
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X Windows - look at its documentation at http://reality.sgi.com/mjk/spec3/spec3.html */
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glutInit(&argc, argv);
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/* Select type of Display mode:
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Double buffer
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RGBA color
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Alpha components supported
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Depth buffer */
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glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH);
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/* get a 640 x 480 window */
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glutInitWindowSize(640, 480);
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/* the window starts at the upper left corner of the screen */
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glutInitWindowPosition(0, 0);
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/* Open a window */
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window = glutCreateWindow("Jeff Molofee's GL Code Tutorial ... NeHe '99");
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/* Register the function to do all our OpenGL drawing. */
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glutDisplayFunc(&DrawGLScene);
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/* Go fullscreen. This is the soonest we could possibly go fullscreen. */
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/*glutFullScreen();*/
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/* Even if there are no events, redraw our gl scene. */
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glutIdleFunc(&DrawGLScene);
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/* Register the function called when our window is resized. */
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glutReshapeFunc(&ReSizeGLScene);
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/* Register the function called when the keyboard is pressed. */
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glutKeyboardFunc(&keyPressed);
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glutSpecialFunc(&specialKeyPressed);
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/* Initialize our window. */
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InitGL(640, 480);
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/* Start Event Processing Engine */
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glutMainLoop();
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return 1;
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}
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Reference in New Issue