I'm trying to track down the bug but no luck so far. My code is based off NeHe's lesson 17. Anyone have similar problems before or know what could cause this kind of glitch? Thanks

Hmmm maybe you might post code, that would make it easier to help you...
Make sure blending and texture are enabled.

This is where I build it...

GLvoid glApp::BuildTexFont(GLvoid){	//character coordinates	GLfloat cx, cy;	//generate display lists, base will point to first, base+1 second, etc.	base = glGenLists(256);	glBindTexture(GL_TEXTURE_2D, textures[0]);	for (int i=0; i<256; i++)	{		cx=float(i%16)/16.0f;	//x position of current character		cy=float(i/16)/16.0f;	//y position of current character		glNewList(base+i,GL_COMPILE);		glBegin(GL_QUADS);			glTexCoord2f(cx,1-cy-0.0625f);			//bottom left uv			glVertex2i(0,0);						//bottom left xy						glTexCoord2f(cx+0.0625f,1-cy-0.0625f);	//bottom right uv			glVertex2i(16,0);						//bottom right xy			glTexCoord2f(cx+0.0625f,1-cy);			//top right uv			glVertex2i(16,16);						//top right xy			glTexCoord2f(cx,1-cy);					//top left uv			glVertex2i(0,16);						//top left xy		glEnd();		//move to the right of the character to avoid overdraw		glTranslated(10,0,0);																		glEndList();	}}

This is where I print it...

GLvoid glApp::glPrintTex(GLuint x, GLuint y, int set, const char *fmt, ...){        char text[256];	va_list args;	if (fmt == NULL) return;	va_start(args, fmt);		vsprintf(text,fmt,args);	va_end(args);	if (set > 1)		set=1;	//SET UP ORTHO VIEW	glBindTexture(GL_TEXTURE_2D, textures[0]);	//select font texture	glDisable(GL_DEPTH_TEST);					//disable depth test	glMatrixMode(GL_PROJECTION);				//select projection matrix	glPushMatrix();								//store it on stack	glLoadIdentity();							//reset projection matrix		glOrtho(0,width,0,height,-1,1);				//set up ortho screen	glMatrixMode(GL_MODELVIEW);					//select modelview matrix	glPushMatrix();								//store it on stack	glLoadIdentity();							//reset modelview matrix	glTranslated(x,y,0);	glListBase(base-32+(128*set));				//select style (regular or italic)		//RENDERING	glCallLists((GLsizei)strlen(text),GL_UNSIGNED_BYTE, text);	//UNDO CHANGES	glMatrixMode(GL_PROJECTION);	glPopMatrix();	glMatrixMode(GL_MODELVIEW);	glPopMatrix();	glEnable(GL_DEPTH_TEST);}

Just to be sure...
Have you enable texturing using glEnable(GL_TEXTURE_2D) ?

Chman

Yes. Blending is also enabled.

Also, to clarify the topic title, it's each individual character that's showing up as a separate white block.

Hum that's pretty strange, because your code seems correct...
Are you sure your texture is correctly loaded ?

Else the texture ID will be 0 (0 = blank texture).

Chman

Try glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) if you havent already just before you bind the texture inside the draw func

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) didn't help.

I was looking over my texture loading code and I'm pretty sure the old way I was doing it could have been the problem. I have another rather silly problem now (look at comment in caps):

int glApp::LoadGLTextures(unsigned char filter){	int Status=FALSE;	//open the texture file	FILE* texf = fopen("tex.txt","r");	if(!texf)	{		KillGLWindow();		MessageBox(NULL, "Can't open texture index (tex.txt).", "Error", MB_OK | MB_ICONEXCLAMATION);		return FALSE;	}	char line[1024];						//a line in tex.txt	unsigned int temp=0;					//how many textures in txt.txt	while (fgets(line,1024,texf))		temp++;	const unsigned int size = temp;	fclose(texf);	texf = fopen("tex.txt","r");	if (!texf)		MessageBox(0, "Error opening texture.", "Error", MB_OK | MB_ICONEXCLAMATION);	textures = new unsigned int[size];		//allocate the texture array	glGenTextures(size, &textures[0]);		//generate texture names		char tex[32];							//texture name	//LINE BELOW CAUSES "EXPECTED CONSTANT EXPRESSION" ERROR	AUX_RGBImageRec *TextureImage[size];               // Create Storage Space For The Textures    memset(TextureImage,0,sizeof(void *)*size);        // Set The Pointer To NULL	unsigned int count=0;	while (fgets(line,1024,texf)!=NULL)	{		sscanf(line,"%s",tex);		if (TextureImage[count]=LoadBMP(tex))		{			Status=TRUE;						//bind named texture to texture target			glBindTexture(GL_TEXTURE_2D, textures[count]);						switch (filter)			{			case 0:				{					glTexImage2D(GL_TEXTURE_2D,0,3,TextureImage[0]->sizeX,TextureImage[0]->sizeY,0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage[0]->data);					glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);					glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);					break;				}			case 1:				{					glTexImage2D(GL_TEXTURE_2D,0,3,TextureImage[0]->sizeX,TextureImage[0]->sizeY,0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage[0]->data);					glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);					glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);					break;				}			case 2:				{					glTexImage2D(GL_TEXTURE_2D,0,3,TextureImage[0]->sizeX,TextureImage[0]->sizeY,0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage[0]->data);					glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);					glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);					break;				}			case 3:				{					glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);					glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_NEAREST);					gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);					break;				}			}		}		count++;	}	for (unsigned int loop=0; loop<size; loop++)	{		if (TextureImage[loop])							// If Texture Exists	    {		        			if (TextureImage[loop]->data)			// If Texture Image Exists		    {		        free(TextureImage[loop]->data);	// Free The Texture Image Memory			}			free(TextureImage[loop]);				// Free The Image Structure		}	}	return Status;}

The lines just before the loop cause a "expected constant expression" error on compile. Is there another way of loading the textures that would avoid this problem?

Also, tell me if there's anything in there that could be causing my original problem (texture mapped fonts not appearing correctly).

Thanks

A stack allocated array must have a size that can be detetmined at compile time. You should use a dynamically allocated array (using operator new[]) or, better still, use one of the standard library containers like std::vector.

As to your original problem. Usually this is the result of invalid textures. Make sure your textures are power-of-two sized and that you obtain a valid OpenGL rendering context before loading the textures. The other common cause of white textures is using mipmapping without specifying mipmaps, but your mipmap code looks fine.

Hope that helps,

Enigma