256x256pixel textures

/**********************************************************************//********************************************************************//* Example 3: A fully interactive 3D world with OpenGL              *//********************************************************************/#include <windows.h>#include <stdio.h>#include <gl\gl.h>#include <gl\glut.h>#include <gl\glu.h> /* GLU extention library */#include <gl\glaux.h>#include <gl\glext.h>										// Header File For The Glaux Libraryvoid init(void);void display(void);void keyboard(unsigned char, int, int);void resize(int, int);void drawcube(int, int, int);int is_depth; /* depth testing flag */GLuint	texture[2];											// Font Texture Storage SpaceAUX_RGBImageRec *LoadBMP(char *Filename)			        // Loads The Bitmap Images{		FILE *File=NULL;								    // File Handle		if (!Filename)										// Make Sure A Filename Was Given		{			return NULL;									// If Not Return NULL		}		File=fopen(Filename,"r");							// Check To See If The File Exists		if (File)											// Does The File Exist?		{			fclose(File);									// Close The Handle			return auxDIBImageLoad(Filename);				// Load The Bitmap And Return A Pointer		}		return NULL;										// If Load Failed Return NULL}int LoadGLTextures()										// Load Bitmaps And Convert To Textures{        int Status=FALSE;									// Status Indicator		int		loop1;												// Generic Loop1        AUX_RGBImageRec *TextureImage[2];					// Create Storage Space For The Textures        memset(TextureImage,0,sizeof(void *)*2);			// Set The Pointer To NULL        if ((TextureImage[0]=LoadBMP("c:/BITMAPS/SCREEN0/screen0.bmp")))	// Load Background Image        {			Status=TRUE;									// Set The Status To TRUE			glGenTextures(2, &texture[0]);					// Create The Texture			for (loop1=0; loop1<1; loop1++)					// Loop Through 2 Textures			{				glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture[loop1]);				glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 3, TextureImage[loop1]->sizeX, TextureImage[loop1]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[loop1]->data);				glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_LINEAR);				glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_LINEAR);			}			for (loop1=0; loop1<1; loop1++)					// Loop Through 2 Textures			{				if (TextureImage[loop1])					// If Texture Exists					{					if (TextureImage[loop1]->data)			// If Texture Image Exists					{						free(TextureImage[loop1]->data);	// Free The Texture Image Memory					}					free(TextureImage[loop1]);				// Free The Image Structure				}			}		}	return Status;											// Return The Status}int main (int argc, char **argv){	glutInit(&argc, argv);	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);	glutInitWindowSize(640, 480);	glutInitWindowPosition(40, 40);	glutCreateWindow("The Cube World");	init();	glutDisplayFunc(display);	glutKeyboardFunc(keyboard);	/* this time we're going to keep the aspect ratio	constant by trapping the window resizes */	glutReshapeFunc(resize);  	glutMainLoop();	return 0;}void init(void){		if (!LoadGLTextures())							// Jump To Texture Loading Routine ( NEW )	{	//	return FALSE;							// If Texture Didn't Load Return FALSE ( NEW )	}	glEnable(GL_TEXTURE_RECTANGLE_ARB);						// Enable Texture Mapping ( NEW )	glShadeModel(GL_SMOOTH);		glClearColor(0.0, 0.0, 0.0, 0.0);	glEnable(GL_DEPTH_TEST);	is_depth = 1;	glMatrixMode(GL_MODELVIEW);}void display(void){	if (is_depth)		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	else		glClear(GL_COLOR_BUFFER_BIT);	/* draw the floor */	//example (note, I'm just using 2d coordinates, but the glTexCoord2d function is the important part anyway):	glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture[0]);				// Select Our Texture	//glBegin( GL_QUADS );	//glTexCoord2f(0.0f,0.0f);							glVertex3f(-64.0f, -64.0f,  1.0f);	//glTexCoord2f((640.0f/1024.0f),0.0f);				glVertex3f( 64.0f, -64.0f,  1.0f);	//glTexCoord2f((640.0f/1024.0f),(480.0f/1024.0f));	glVertex3f( 64.0f,  70.0f,  1.0f);	//glTexCoord2f(0.0f,(480.0f/1024.0f));				glVertex3f(-64.0f,  70.0f,  1.0f);	//glEnd();	glBegin(GL_QUADS);				glTexCoord2d(0, 640); glVertex2i(-64.0f, -64.0f);	// Bottom Left Of The Texture and Quad		glTexCoord2d(0, 640); glVertex2i( 64.0f, -64.0f);	// Bottom Right Of The Texture and Quad		glTexCoord2d(0, 480); glVertex2i( 64.0f,  70.0f);	// Top Right Of The Texture and Quad		glTexCoord2d(0, 480); glVertex2i(-64.0f,  70.0f);	// Top Left Of The Texture and Quad	glEnd();	glutSwapBuffers();}void keyboard(unsigned char key, int x, int y){	/* This time the controls are:		  "a": move left	  "d": move right	  "w": move forward	  "s": move back	  "t": toggle depth-testing	*/	switch (key)	{	case 'a':	case 'A'://		glTranslatef(5.0, 0.0, 0.0);		break;	case 'd':	case 'D'://		glTranslatef(-5.0, 0.0, 0.0);		break;	case 'w':	case 'W':		glTranslatef(0.0, 0.0, 5.0);		break;	case 's':	case 'S':		glTranslatef(0.0, 0.0, -5.0);		break;	case 't':	case 'T':		if (is_depth)		{			is_depth = 0;			glDisable(GL_DEPTH_TEST);		}		else		{			is_depth = 1;			glEnable(GL_DEPTH_TEST);		}	}	display();}void resize(int width, int height){	if (height == 0) height = 1;		glMatrixMode(GL_PROJECTION);	glLoadIdentity();	/* note we divide our width by our height to get the aspect ratio */	gluPerspective(45.0, width / height, 1.0, 400.0);	/* set initial position */	glTranslatef(0.0, -5.0, -150.0);	glMatrixMode(GL_MODELVIEW);}/**********************************************************************/