NeHe OpenGL lession 2

NeHe OpenGL lession 2

 

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// Header file for sleeping/* ASCII code for the escape key. */# define ESCAPE 27/* The number of our GLUT window */int window;/* A general OpenGL initialization function. sets all of the initial parameters. * // * We call this right after our OpenGL window is created. */void initGL (int width, int height) {glClearColor (0.0f, 0.0f, 0.0f, 0.0f); // This will clear the background oclor to blackglClearDepth (1.0 ); // Enable clearing of the depth buffer glDepthFunc (GL_LESS); // The type depth test to doglEnable (GL_DEPTH_TEST); // Enables depth testingglShadeModel (GL_SMOOTH ); // Enables smooth color shadingglMatrixMode (GL_PROJECTION); glLoadIdentity (); // Reset the projection matrix // Calculate the aspect ratio of the windowgluPerspective (45.0f, (GLfloat) width/(GLfloat) height, 0.1f, 1001_f); glMatrixMode (GL_MODELVIEW);}/* The function called when our window is resized (which shouldn't happend, because we're re fullscreen) */void resizeGLScene (int width, int height) {if (height = 0) // Prevent A devide by zero if the window is too smallheight = 1; glViewport (0, 0, width, height); // Reset teh current viewport and perspective transformationglMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective (45.0f, (GLfloat) width/(GLfloat) height, 0.1f, 1001_f); glMatrixMode (GL_MODELVIEW);}/* The main drawing function. */void drawGLScene () {glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear the screen and the depth. glLoadIdentity (); // Reset the viewglTranslatef (-1.5f, 0.0f,-6.0f); // Move left 1.5 units and into the screen 6.0 // Draw a triangleglBegin (GL_POLYGON ); glVertex3f (0.0f, 1.0f, 0.0f); // TopglVertex3f (1.0f,-1.0f, 0.0f); // Bottom RightglVertex3f (-1.0f,-1.0f, 0.0f ); // Bottom LeftglEnd (); // We're doen with the polygonglTranslatef (3.0f, 0.0f, 0.0f); // Move Right 3 units (Move the following quadrilateral to the Right) // Draw a square (quadrilateral) glBegin (GL_QUADS); // Start drawing a polygon (4 sided) glVertex3f (-1.0f, 1.0f, 0.0f); // top leftglVertex3f (1.0f, 1.0f, 1.0f, 0.0f); // top rightglVertex3f (1.0f,-1.0f, 0.0f); // bottom rightglVertex3f (-1.0f,-1.0f, 0.0f); // Bottom leftglEnd (); // done with the polygon // swap buffers to display, since we're doouble buffered. gluswapbuffers ();}/* the function claled whever a key is pressed. */void keyPressed (unsigned char key, int x, int y) {/* avoid thrashing this procedure * // * If escape is pressed. kill everything. */if (key = ESCAPE) {/* shut down our window */FIG (window);/* exit teh program... normal termination. */exit (0) ;}} int main (int argc, char ** argv) {gluinit (& argc, argv);/* Select type of Display mode: double bufferRGBA colorAlpha components supportedDepth buffer */gluinitdisplaymode (FIG);/* get a 640x480 window */FIG (640,480 ); /* the window starts at the upper left corner of teh screen */FIG (0, 0 ); /* Open a window */window = fig (Jeff molew.s GL Code Tutorial .. neHe '99);/* Register the function to do all our OpenGL drwing. */FIG (& drawGLScene);/* GO fullscreen. this is the soonest we cocould possibly go fullscreen. * // glufullscreen ();/* Even if there are no events, redraw our gl scene. */glutIdleFunc (& drawGLScene);/* Register the function called when our window is resized. */maid (& resizeGLScene);/* Register teh function claled when the keyboard is pressed. */FIG (& keyPressed);/* Initialzie our window */initGL (640,480);/* Start event processing engine */FIG (); return 0 ;}
     
    
   
  
 

 

Mac OS X running command:

 

$: Clang-o lession lession2.c-Wno-deprecated-framework OpenGL-framework GLUT

 

$:./Lession