GLUT - wyświetlanie grafiki

GLint iViewport[ 4 ];

glClearColor( 1.f, 1.f, 1.f, 1.f );
glClear( GL_COLOR_BUFFER_BIT );
glLoadIdentity();

glGetIntegerv( GL_VIEWPORT, iViewport );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( iViewport[ 0 ], iViewport[ 0 ] + iViewport[ 2 ],
iViewport[ 1 ] + iViewport[ 3 ], iViewport[ 1 ], - 1, 1 );

glMatrixMode( GL_MODELVIEW );

glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );

glColor3f( 1.f, 1.f, 1.f );
glBindTexture( GL_TEXTURE_RECTANGLE_ARB, texId );
glBegin( GL_QUADS );
glTexCoord2i( 0, 0 );
glVertex2i( 0, 0 );
glTexCoord2i( texW, 0 );
glVertex2i( texW, 0 );
glTexCoord2i( texW, texH );
glVertex2i( texW, texH );
glTexCoord2i( 0, texH );
glVertex2i( 0, texH );
glEnd();

glFlush();