void SetUpTextureMaps( void ){// This texture object is for the ceiling texture map.GLuint ceilingTexObj;　　const char ceilingTexFile[] = "images/ceiling.jpg";glGenTextures( 1, &ceilingTexObj );glBindTexture( GL_TEXTURE_2D, ceilingTexObj );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );if ( ReadImageFile( ceilingTexFile, &imageData, &imageWidth, &imageHeight, &numComponents ) == 0 ) exit( 1 );if ( numComponents != 3 ){fprintf( stderr, "Error: Texture image is not in RGB format.\n" );exit( 1 );}gluBuild2DMipmaps( GL_TEXTURE_2D, GL_RGB, imageWidth, imageHeight,GL_RGB, GL_UNSIGNED_BYTE, imageData );DeallocateImageData( &imageData );}

void DrawRoom( void )
{const float ROOM_HALF_WIDTH = ROOM_WIDTH / 2.0f;glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );// Ceiling.
GLfloat matAmbient1[] = { 0.7, 0.7, 0.7, 1.0 };GLfloat matDiffuse1[] = { 0.7, 0.7, 0.7, 1.0 };GLfloat matSpecular1[] = { 0.3, 0.3, 0.3, 1.0 };GLfloat matShininess1[] = { 32.0 };glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT, matAmbient1 );glMaterialfv( GL_FRONT_AND_BACK, GL_DIFFUSE, matDiffuse1 );glMaterialfv( GL_FRONT_AND_BACK, GL_SPECULAR, matSpecular1 );glMaterialfv( GL_FRONT_AND_BACK, GL_SHININESS, matShininess1 );glBindTexture( GL_TEXTURE_2D, ceilingTexObj );glNormal3f( 0.0, -1.0, 0.0 ); // Normal vector.SubdivideAndDrawQuad( 24, 24, 0.0, 0.0, ROOM_HALF_WIDTH, ROOM_HEIGHT, ROOM_HALF_WIDTH,ROOM_WIDTH, 0.0, -ROOM_HALF_WIDTH, ROOM_HEIGHT, ROOM_HALF_WIDTH,ROOM_WIDTH, ROOM_WIDTH, -ROOM_HALF_WIDTH, ROOM_HEIGHT, -ROOM_HALF_WIDTH,0.0, ROOM_WIDTH, ROOM_HALF_WIDTH, ROOM_HEIGHT, -ROOM_HALF_WIDTH );
}

void SetUpTextureMaps( void )
{
// This texture object is for storing the reflection image.
glGenTextures( 1, &reflectionTexObj );glBindTexture( GL_TEXTURE_2D, reflectionTexObj );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );glTexParameteri( GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE );
}