/* * This code was created by Jeff Molofee '99 * (ported to Linux/SDL by Ti Leggett '01) * * If you've found this code useful, please let me know. * * Visit Jeff at http://nehe.gamedev.net/ * * or for port-specific comments, questions, bugreports etc. * email to leggett@eecs.tulane.edu */ #include <stdio.h>#include <stdlib.h>#include <GL/gl.h>#include <GL/glu.h>#include "SDL.h"/* screen width, height, and bit depth */#define SCREEN_WIDTH 640#define SCREEN_HEIGHT 480#define SCREEN_BPP 16/* Define our booleans */#define TRUE 1#define FALSE 0/* This is our SDL surface */SDL_Surface *surface;/* function to release/destroy our resources and restoring the old desktop */void Quit( int returnCode ){ /* clean up the window */ SDL_Quit( ); /* and exit appropriately */ exit( returnCode );}/* function to reset our viewport after a window resize */int resizeWindow( int width, int height ){ /* Height / width ration */ GLfloat ratio; /* Protect against a divide by zero */ if ( height == 0 ) height = 1; ratio = ( GLfloat )width / ( GLfloat )height; /* Setup our viewport. */ glViewport( 0, 0, ( GLsizei )width, ( GLsizei )height ); /* change to the projection matrix and set our viewing volume. */ glMatrixMode( GL_PROJECTION ); glLoadIdentity( ); /* Set our perspective */ gluPerspective( 45.0f, ratio, 0.1f, 100.0f ); /* Make sure we're chaning the model view and not the projection */ glMatrixMode( GL_MODELVIEW ); /* Reset The View */ glLoadIdentity( ); return( TRUE );}/* function to handle key press events */void handleKeyPress( SDL_keysym *keysym ){ switch ( keysym->sym ) { case SDLK_ESCAPE: /* ESC key was pressed */ Quit( 0 ); break; case SDLK_F1: /* F1 key was pressed * this toggles fullscreen mode */ SDL_WM_ToggleFullScreen( surface ); break; default: break; } return;}/* general OpenGL initialization function */int initGL( GLvoid ){ /* Enable smooth shading */ glShadeModel( GL_SMOOTH ); /* Set the background black */ glClearColor( 0.0f, 0.0f, 0.0f, 0.0f ); /* Depth buffer setup */ glClearDepth( 1.0f ); /* Enables Depth Testing */ glEnable( GL_DEPTH_TEST ); /* The Type Of Depth Test To Do */ glDepthFunc( GL_LEQUAL ); /* Really Nice Perspective Calculations */ glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ); return( TRUE );}/* Here goes our drawing code */int drawGLScene( GLvoid ){ /* These are to calculate our fps */ static GLint T0 = 0; static GLint Frames = 0; /* Clear The Screen And The Depth Buffer */ glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); /* Move Left 1.5 Units And Into The Screen 6.0 */ glLoadIdentity(); glTranslatef( -1.5f, 0.0f, -6.0f ); glBegin( GL_TRIANGLES ); /* Drawing Using Triangles */ glVertex3f( 0.0f, 1.0f, 0.0f ); /* Top */ glVertex3f( -1.0f, -1.0f, 0.0f ); /* Bottom Left */ glVertex3f( 1.0f, -1.0f, 0.0f ); /* Bottom Right */ glEnd( ); /* Finished Drawing The Triangle */ /* Move Right 3 Units */ glTranslatef( 3.0f, 0.0f, 0.0f ); glBegin( GL_QUADS ); /* Draw A Quad */ glVertex3f( -1.0f, 1.0f, 0.0f ); /* Top Left */ glVertex3f( 1.0f, 1.0f, 0.0f ); /* Top Right */ glVertex3f( 1.0f, -1.0f, 0.0f ); /* Bottom Right */ glVertex3f( -1.0f, -1.0f, 0.0f ); /* Bottom Left */ glEnd( ); /* Done Drawing The Quad */ /* Draw it to the screen */ SDL_GL_SwapBuffers( ); /* Gather our frames per second */ Frames++; { GLint t = SDL_GetTicks(); if (t - T0 >= 5000) { GLfloat seconds = (t - T0) / 1000.0; GLfloat fps = Frames / seconds; printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps); T0 = t; Frames = 0; } } return( TRUE );}int main( int argc, char **argv ){ /* Flags to pass to SDL_SetVideoMode */ int videoFlags; /* main loop variable */ int done = FALSE; /* used to collect events */ SDL_Event event; /* this holds some info about our display */ const SDL_VideoInfo *videoInfo; /* whether or not the window is active */ int isActive = TRUE; /* initialize SDL */ if ( SDL_Init( SDL_INIT_VIDEO ) < 0 ) { fprintf( stderr, "Video initialization failed: %s\n", SDL_GetError( ) ); Quit( 1 ); } /* Fetch the video info */ videoInfo = SDL_GetVideoInfo( ); if ( !videoInfo ) { fprintf( stderr, "Video query failed: %s\n", SDL_GetError( ) ); Quit( 1 ); } /* the flags to pass to SDL_SetVideoMode */ videoFlags = SDL_OPENGL; /* Enable OpenGL in SDL */ videoFlags |= SDL_GL_DOUBLEBUFFER; /* Enable double buffering */ videoFlags |= SDL_HWPALETTE; /* Store the palette in hardware */ videoFlags |= SDL_RESIZABLE; /* Enable window resizing */ /* This checks to see if surfaces can be stored in memory */ if ( videoInfo->hw_available ) videoFlags |= SDL_HWSURFACE; else videoFlags |= SDL_SWSURFACE; /* This checks if hardware blits can be done */ if ( videoInfo->blit_hw ) videoFlags |= SDL_HWACCEL; /* Sets up OpenGL double buffering */ SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); /* get a SDL surface */ surface = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, videoFlags ); /* Verify there is a surface */ if ( !surface ) { fprintf( stderr, "Video mode set failed: %s\n", SDL_GetError( ) ); Quit( 1 ); } /* initialize OpenGL */ initGL( ); /* resize the initial window */ resizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT ); /* wait for events */ while ( !done ) { /* handle the events in the queue */ while ( SDL_PollEvent( &event ) ) { switch( event.type ) { case SDL_ACTIVEEVENT: /* Something's happend with our focus * If we lost focus or we are iconified, we * shouldn't draw the screen */ if ( event.active.gain == 0 ) isActive = FALSE; else isActive = TRUE; break; case SDL_VIDEORESIZE: /* handle resize event */ surface = SDL_SetVideoMode( event.resize.w, event.resize.h, 16, videoFlags ); if ( !surface ) { fprintf( stderr, "Could not get a surface after resize: %s\n", SDL_GetError( ) ); Quit( 1 ); } resizeWindow( event.resize.w, event.resize.h ); break; case SDL_KEYDOWN: /* handle key presses */ handleKeyPress( &event.key.keysym ); break; case SDL_QUIT: /* handle quit requests */ done = TRUE; break; default: break; } } /* draw the scene */ if ( isActive ) drawGLScene( ); } /* clean ourselves up and exit */ Quit( 0 ); /* Should never get here */ return( 0 );}Mailing list eh, I guess I'll get on there and post my problem....
