/* $Id: multitex.c,v 3.2 1998/04/01 02:57:49 brianp Exp $ */ /* * Multitexture demo * Brian Paul February 1998 This program is in the public domain. */ /* * $Log: multitex.c,v $ * Revision 3.2 1998/04/01 02:57:49 brianp * added extension test in Init() * * Revision 3.1 1998/02/21 00:59:17 brianp * changed background color * * Revision 3.0 1998/02/20 04:42:06 brianp * initial rev * */ #include #include #include #include #include #include "../util/readtex.c" /* I know, this is a hack. */ #define TEX0 1 #define TEX1 2 #define TEXBOTH 3 #define ANIMATE 10 #define QUIT 100 static GLboolean Animate = GL_TRUE; static GLfloat Drift = 0.0; static GLfloat Xrot = 20.0, Yrot = 30.0, Zrot = 0.0; static GLfloat DXrot = 1.0, DYrot = 2.5; static void Idle( void ) { if (Animate) { Drift += 0.05; #ifdef GL_SGIS_multitexture glSelectTextureSGIS(GL_TEXTURE0_SGIS); #endif glMatrixMode(GL_TEXTURE); glLoadIdentity(); glTranslatef(Drift, 0.0, 0.0); glMatrixMode(GL_MODELVIEW); #ifdef GL_SGIS_multitexture glSelectTextureSGIS(GL_TEXTURE1_SGIS); #endif glMatrixMode(GL_TEXTURE); glLoadIdentity(); glTranslatef(0.0, Drift, 0.0); glMatrixMode(GL_MODELVIEW); glutPostRedisplay(); } } static void DrawObject(void) { glBegin(GL_QUADS); #ifdef GL_SGIS_multitexture glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 0.0, 0.0); glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 0.0, 0.0); glVertex2f(-1.0, -1.0); glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 2.0, 0.0); glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 1.0, 0.0); glVertex2f(1.0, -1.0); glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 2.0, 2.0); glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 1.0, 1.0); glVertex2f(1.0, 1.0); glMultiTexCoord2fSGIS(GL_TEXTURE0_SGIS, 0.0, 2.0); glMultiTexCoord2fSGIS(GL_TEXTURE1_SGIS, 0.0, 1.0); glVertex2f(-1.0, 1.0); #else glTexCoord2f(0.0, 0.0); glVertex2f(-1.0, -1.0); glTexCoord2f(1.0, 0.0); glVertex2f(1.0, -1.0); glTexCoord2f(1.0, 1.0); glVertex2f(1.0, 1.0); glTexCoord2f(0.0, 1.0); glVertex2f(-1.0, 1.0); #endif glEnd(); } static void Display( void ) { glClear( GL_COLOR_BUFFER_BIT ); glPushMatrix(); glRotatef(Xrot, 1.0, 0.0, 0.0); glRotatef(Yrot, 0.0, 1.0, 0.0); glRotatef(Zrot, 0.0, 0.0, 1.0); glScalef(5.0, 5.0, 5.0); DrawObject(); glPopMatrix(); glutSwapBuffers(); } static void Reshape( int width, int height ) { glViewport( 0, 0, width, height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 ); /*glOrtho( -6.0, 6.0, -6.0, 6.0, 10.0, 100.0 );*/ glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glTranslatef( 0.0, 0.0, -70.0 ); } static void ModeMenu(int entry) { GLboolean enable0 = GL_FALSE, enable1 = GL_FALSE; if (entry==TEX0) { enable0 = GL_TRUE; } else if (entry==TEX1) { enable1 = GL_TRUE; } else if (entry==TEXBOTH) { enable0 = GL_TRUE; enable1 = GL_TRUE; } else if (entry==ANIMATE) { Animate = !Animate; } else if (entry==QUIT) { exit(0); } if (entry != ANIMATE) { #ifdef GL_SGIS_multitexture glSelectTextureSGIS(GL_TEXTURE0_SGIS); #endif if (enable0) { glEnable(GL_TEXTURE_2D); } else glDisable(GL_TEXTURE_2D); #ifdef GL_SGIS_multitexture glSelectTextureSGIS(GL_TEXTURE1_SGIS); #endif if (enable1) { glEnable(GL_TEXTURE_2D); } else glDisable(GL_TEXTURE_2D); } glutPostRedisplay(); } static void Key( unsigned char key, int x, int y ) { switch (key) { case 27: exit(0); break; } glutPostRedisplay(); } static void SpecialKey( int key, int x, int y ) { float step = 3.0; switch (key) { case GLUT_KEY_UP: Xrot += step; break; case GLUT_KEY_DOWN: Xrot -= step; break; case GLUT_KEY_LEFT: Yrot += step; break; case GLUT_KEY_RIGHT: Yrot -= step; break; } glutPostRedisplay(); } static void Init( void ) { const char *exten = (const char *) glGetString(GL_EXTENSIONS); if (!strstr(exten, "GL_SGIS_multitexture")) { printf("Sorry, GL_SGIS_multitexture not supported by this renderer.\n"); exit(1); } /* setup textur env 0 */ #ifdef GL_SGIS_multitexture glSelectTextureSGIS(GL_TEXTURE0_SGIS); #endif #ifdef LINEAR_FILTER /* linear filtering looks much nicer but is much slower for Mesa */ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); #else glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); #endif glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); if (!LoadRGBMipmaps("girl.rgb", GL_RGB)) { printf("Error: couldn't load texture image\n"); exit(1); } /* setup textur env 1 */ #ifdef GL_SGIS_multitexture glSelectTextureSGIS(GL_TEXTURE1_SGIS); #endif #ifdef LINEAR_FILTER /* linear filtering looks much nicer but is much slower for Mesa */ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); #else glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); #endif glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); if (!LoadRGBMipmaps("reflect.rgb", GL_RGB)) { printf("Error: couldn't load texture image\n"); exit(1); } glShadeModel(GL_FLAT); glClearColor(0.3, 0.3, 0.4, 1.0); ModeMenu(TEXBOTH); } int main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitWindowSize( 300, 300 ); glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); glutCreateWindow(argv[0] ); Init(); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutSpecialFunc( SpecialKey ); glutDisplayFunc( Display ); glutIdleFunc( Idle ); glutCreateMenu(ModeMenu); glutAddMenuEntry("Texture 0", TEX0); glutAddMenuEntry("Texture 1", TEX1); glutAddMenuEntry("Multi-texture", TEXBOTH); glutAddMenuEntry("Toggle Animation", ANIMATE); glutAddMenuEntry("Quit", QUIT); glutAttachMenu(GLUT_RIGHT_BUTTON); glutMainLoop(); return 0; }