Mine

textures.h:typedef struct {	unsigned int id;	int num;	char **data;} mipmap;extern int load_texture(char *data, int level, char *file);extern int load_mipmap(mipmap *mip, char *basename, int size);extern void free_mipmap(mipmap *mip);----------------------------------------------------------------------textures.c:#include "main.h"int load_texture(char *data, int level, char *file) {	FILE *src=fopen(file,"rb");	int temp;	char ctemp;	int size;	int bytespp;	int height;	int width;	int bpp;			if(!src) {		fprintf(stderr,"load_texture: Unable to open texture file \"%s\"\n",file);		return -1;	}	fseek(src,12,SEEK_SET);		//get texture width	temp=fgetc(src);	width=(fgetc(src)<<8)+temp;		//get texture height	temp=fgetc(src);	height=(fgetc(src)<<8)+temp;		bpp=fgetc(src);	if(bpp!=24 && bpp!=32) {		fprintf(stderr,"load_texture Texture file must be 24 or 32 bits per pixel\n");		fclose(src);		return -1;	}	fseek(src,1,SEEK_CUR);		bytespp=bpp/8;	size=width*height*bytespp;	data=malloc(size);		if(!data) {		fprintf(stderr,"load_texture: memory\n");		fclose(src);		return -1;	}		if(fread(data,1,size,src)!=size) {		fprintf(stderr,"load_texture: Error reading texture file\n");		free(data);		fclose(src);		return -1;	}	fclose(src);			//convert image data from BGR to RGB		for(temp=0;temp<size;temp+=bytespp) {		ctemp=data[temp];		data[temp]=data[temp+2];		data[temp+2]=ctemp;	}			temp=(bpp==24?GL_RGB:GL_RGBA);		//build the texture	glTexImage2D(GL_TEXTURE_2D,level,temp,width,height,0,temp,GL_UNSIGNED_BYTE,data);	return 0;}int load_mipmap(mipmap *mip, char *basename, int size) {	char *buffer=malloc(strlen(basename)+3);	int i;	int num=0;	for(i=size;i;i/=2)		num++;		mip->data=malloc(num*sizeof(char *));		if(!buffer) {		fprintf(stderr,"load_mipmap: memory\n");		return -1;	}	if(!mip->data) {		fprintf(stderr,"load_mipmap: memory\n");		free(buffer);		return -1;	}		mip->num=num;		glGenTextures(1,&mip->id);	glBindTexture(GL_TEXTURE_2D,mip->id);		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_NEAREST_MIPMAP_LINEAR);		glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);		num=0;	for(i=size;i;i/=2,num++) {		sprintf(buffer,basename,i);				if(load_texture(mip->data[num],num,buffer)) {			fprintf(stderr,"load_mipmap: Unable to load mipmap\n",buffer);			free(buffer);			free(mip->data);			return -1;		}		free(mip->data[0]);return 0;	}	free(buffer);	return 0;}void free_mipmap(mipmap *mip) {	int i=0;			for(;i<mip->num;i++) {		free(mip->data[i]);	}	free(mip->data);}