textobj.c

这是一个相当棒的Linux下的台球游戏

/* textobj.c
**
**    quad with text as texture using OpenGL
**    Copyright (C) 2001  Florian Berger
**    Email: [e-mail], [e-mail]
**
**    This program is free software; you can redistribute it and/or modify
**    it under the terms of the GNU General Public License Version 2 as
**    published by the Free Software Foundation;
**
**    This program is distributed in the hope that it will be useful,
**    but WITHOUT ANY WARRANTY; without even the implied warranty of
**    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**    GNU General Public License for more details.
**
**    You should have received a copy of the GNU General Public License
**    along with this program; if not, write to the Free Software
**    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
*/

#include"options.h"
#include"font.h"
#include"textobj.h"
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef options_use_freetype

void bulb_font( char * data, int w, int h )
{
    int x,y,i,w2,h2,index;
    double d;

    w2=5; h2=5;
    for ( y=0 ; y<h ; y++ ) {
        for ( x=0 ; x<w ; x++ ) {
            d=0;
            for ( i=0 ; i<w2*h2 ; i++ ) {
                index = (y-h2/2+i/w2)*w+x-w2/2+i%w2;
                if( index>0 && index<w*h ){
                    d += (unsigned char)data[index];
                }
            }
            if(data[y*w+x]!=0)
            data[y*w+x] = (double)((unsigned char)data[y*w+x])*d/(double)w2/(double)h2/255.0;
        }
    }
}


void diff_x_font( char * data, int w, int h )
{
    int x,y,w2,h2;
    double d;

    w2=5; h2=5;
    for ( y=0 ; y<h ; y++ ) {
        for ( x=0 ; x<w ; x++ ) {
            d=(unsigned char)data[y*w+x]-(unsigned char)data[y*w+x+1];
            data[y*w+x] = (double)((unsigned char)data[y*w+x])*(200.0-d)/255.0;
        }
    }
}

void diff_xy_font( char * data, int w, int h )
{
    int x,y,w2,h2;
    double d;

    w2=5; h2=5;
    for ( y=0 ; y<h ; y++ ) {
        for ( x=0 ; x<w ; x++ ) {
            d=(unsigned char)data[y*w+x]-(unsigned char)data[(y+1)*w+x+1];
            data[y*w+x] = (double)((unsigned char)data[y*w+x])*(200.0-d)/255.0;
        }
    }
}


int create_string_quad( char * str, char * fontname, int h, int * quad_id, int * tex_id, double * quad_w, double * quad_h )
{
    int    quad_obj;
    int    texbind;
    int    texw,texh, width,height;
    char * texdata;
    double fact;
    int    w1,w2, h1,h2, nx,ny;
#define MAX_TEXW 256
#define MAX_TEXH 256

    getStringPixmapFT( str, fontname, h, &texdata, &texw, &texh, &width, &height );
    glGenTextures(1,&texbind);
/*    nx=(width+MAX_TEX_W-1)/MAX_TEX_W;
    ny=(width+MAX_TEX_H-1)/MAX_TEX_H;
    w1 = MAX_TEX_W;
    w2 = NEXT_POW_OF_2(MAX_TEX_W & (MAX_TEX_W-1));
    h1 = MAX_TEX_H;
    h2 = NEXT_POW_OF_2(MAX_TEX_H & (MAX_TEX_H-1));*/

/*    texnr++;
    texnr=nx*ny

    for(iy=0;iy<ny;iy++){
        for(ix=0;ix<nx;ix++){
            glGenTextures(1,&texbind[texnr]);
        }
    }*/


//    bulb_font(texdata, texw, texh);
//    diff_xy_font(texdata, texw, texh);
//    fprintf(stderr,"texw=%d,texh=%d,w=%d,h=%d\n",texw,texh,width,height);
    glBindTexture(GL_TEXTURE_2D,texbind);
    gluBuild2DMipmaps(GL_TEXTURE_2D, 1, texw, texh, GL_LUMINANCE,
                      GL_UNSIGNED_BYTE, texdata);
//    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
//    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, options_tex_min_filter);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, options_tex_mag_filter);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    free(texdata);
//    fprintf(stderr,"-texbind=%d\n",texbind);

//    fprintf(stderr,"texx=%f,texy=%f\n",(double)texw/(double)width,(double)texh/(double)height);
    fact=(double)h;
    quad_obj = glGenLists(1);
    glNewList(quad_obj, GL_COMPILE);
//    glBindTexture(GL_TEXTURE_2D,lightflaretexbind);
    glBindTexture(GL_TEXTURE_2D,texbind);
    glBegin(GL_QUADS);

    glNormal3f(0,0,1);

    glTexCoord2f(0,0);
    glVertex3f(0,1.0*fact,0);

    glTexCoord2f((double)width/(double)texw,0);
//    glTexCoord2f(1,0);
//    glTexCoord2f((double)texw/(double)width,0);
    glVertex3f((double)width/(double)height*fact,1.0*fact,0);

    glTexCoord2f((double)width/(double)texw,(double)height/(double)texh);
//    glTexCoord2f(1,1);
//    glTexCoord2f((double)texw/(double)width,(double)texh/(double)height);
    glVertex3f((double)width/(double)height*fact,0,0);

    glTexCoord2f(0,(double)height/(double)texh);
//    glTexCoord2f(0,1);
//    glTexCoord2f(0,(double)texh/(double)height);
    glVertex3f(0,0,0);

    glEnd();
    glEndList();

    *quad_h=fact*1.0;
    *quad_w=(double)width/(double)height*fact;

    if(quad_id!=0) *quad_id=quad_obj;
    if(tex_id!=0) *tex_id=texbind;

    return(quad_obj);
}


textObj * textObj_new(char * str, char * fontname, int height )
{
    textObj * obj;
    obj=malloc(sizeof(textObj));
    obj->height=height;
    obj->depth3D=0.0;  /* for toggling to 3D */
    obj->is_3D=0;
    strcpy(obj->str,str);
    strcpy(obj->fontname,fontname);
    create_string_quad( obj->str, obj->fontname, obj->height, &(obj->quad_id), &(obj->tex_id), &(obj->quad_w), &(obj->quad_h) );
    return obj;
}


textObj * textObj3D_new(char * str, char * fontname, double height, float depth,  int ppspline)
{
    textObj * obj;
    obj=malloc(sizeof(textObj));
    obj->height=height;
    obj->depth3D=depth;
    obj->is_3D=1;
    strcpy(obj->str,str);
    strcpy(obj->fontname,fontname);
    obj->obj3D_id=getStringGLListFT( obj->str, obj->fontname, obj->height, obj->depth3D, &(obj->obj3D_w), &(obj->obj3D_h) );
    return obj;
}



void textObj_toggle3D( textObj * obj )
{
    if(! obj->is_3D){
        obj->is_3D=1;
        glDeleteLists( obj->quad_id, 1 );
        obj->quad_id=0;
        glDeleteTextures( 1, &(obj->tex_id) );
        obj->tex_id=0;
        obj->obj3D_id=getStringGLListFT( obj->str, obj->fontname, obj->height, obj->depth3D, &(obj->obj3D_w), &(obj->obj3D_h) );
    } else {
        obj->is_3D=0;
        glDeleteLists( obj->obj3D_id, 1 );
        obj->obj3D_id=0;
        create_string_quad( obj->str, obj->fontname, obj->height, &(obj->quad_id), &(obj->tex_id), &(obj->quad_w), &(obj->quad_h) );
    }
}


void textObj_setText( textObj * obj, char * str )
{
    if( strcmp(str,obj->str)!=0 ){
        if(! obj->is_3D){
            DPRINTF("textObj_setText: obj=%p, text=%s\n",obj, str);
            DPRINTF("textObj_setText 0\n");
            glDeleteLists( obj->quad_id, 1 );
            DPRINTF("textObj_setText 0.5\n");
            obj->quad_id=0;
            DPRINTF("obj->tex_id=%d\n",obj->tex_id);
            if( glIsTexture(obj->tex_id) == GL_TRUE )
                glDeleteTextures( 1, &(obj->tex_id) );
            DPRINTF("textObj_setText 0.75\n");
            obj->tex_id=0;
            strcpy(obj->str,str);
            DPRINTF("textObj_setText 1\n");
            create_string_quad( obj->str, obj->fontname, obj->height, &(obj->quad_id), &(obj->tex_id), &(obj->quad_w), &(obj->quad_h) );
            DPRINTF("textObj_setText 2\n");
        } else {
            glDeleteLists( obj->obj3D_id, 1 );
            obj->obj3D_id=0;
            strcpy(obj->str,str);
            obj->obj3D_id=getStringGLListFT( obj->str, obj->fontname, obj->height, obj->depth3D, &(obj->obj3D_w), &(obj->obj3D_h) );
        }
    }
}


void textObj_delete_last( textObj * obj )
{
    char str[256];
    int slen;
    strcpy(str,obj->str);
    slen = strlen(str);
    str[slen-1]=0;
    textObj_setText(obj,str);
}

void textObj_append_char( textObj * obj, int c )
{
    char str[256];
    int slen;
    strcpy(str,obj->str);
    slen = strlen(str);
    str[slen+1]=0;
    str[slen]=c;
    textObj_setText(obj,str);
}


void textObj_setHeight( textObj * obj, int height )
{
    if(! obj->is_3D){
        glDeleteLists( obj->quad_id, 1 );
        obj->quad_id=0;
        glDeleteTextures( 1, &(obj->tex_id) );
        obj->tex_id=0;
        obj->height=height;
        create_string_quad( obj->str, obj->fontname, obj->height, &(obj->quad_id), &(obj->tex_id), &(obj->quad_w), &(obj->quad_h) );
    } else {
        glDeleteLists( obj->obj3D_id, 1 );
        obj->obj3D_id=0;
        obj->height=height;
        obj->obj3D_id=getStringGLListFT( obj->str, obj->fontname, obj->height, obj->depth3D, &(obj->obj3D_w), &(obj->obj3D_h) );
    }
}

void textObj_setDepth( textObj * obj, int depth )
{
    if(! obj->is_3D){
        obj->depth3D=depth;
    } else {
        glDeleteLists( obj->obj3D_id, 1 );
        obj->obj3D_id=0;
        obj->depth3D=depth;
        obj->obj3D_id=getStringGLListFT( obj->str, obj->fontname, obj->height, obj->depth3D, &(obj->obj3D_w), &(obj->obj3D_h) );
    }
}

void textObj_setFont( textObj * obj, char * fontname )
{
    if(! obj->is_3D){
        glDeleteLists( obj->quad_id, 1 );
        obj->quad_id=0;
        glDeleteTextures( 1, &(obj->tex_id) );
        obj->tex_id=0;
        strcpy(obj->fontname,fontname);
        create_string_quad( obj->str, obj->fontname, obj->height, &(obj->quad_id), &(obj->tex_id), &(obj->quad_w), &(obj->quad_h) );
    } else {
        glDeleteLists( obj->obj3D_id, 1 );
        obj->obj3D_id=0;
        strcpy(obj->fontname,fontname);
        obj->obj3D_id=getStringGLListFT( obj->str, obj->fontname, obj->height, obj->depth3D, &(obj->obj3D_w), &(obj->obj3D_h) );
    }
}

void textObj_draw( textObj * obj )
{
    if(! obj->is_3D){
        if( obj->quad_id != 0 )
            glCallList( obj->quad_id );
    } else {
        if( obj->obj3D_id != 0 ){
//            glDisable(GL_TEXTURE_2D);
            glCallList( obj->obj3D_id );
//            glEnable(GL_TEXTURE_2D);
        }
    }
}

void textObj_draw_centered( textObj * obj )
{
    if(! obj->is_3D){
        glPushMatrix();
        glTranslatef( -(double)(obj->quad_w)/2.0, -(double)(obj->quad_h)/2.0, 0.0 );
        if( obj->quad_id != 0 )
            glCallList( obj->quad_id );
        glPopMatrix();
    } else {
        glPushMatrix();
        glTranslatef( -(double)(obj->obj3D_w)/2.0, -(double)(obj->obj3D_h)/2.0, (double)(obj->depth3D)/2.0 );
        if( obj->obj3D_id != 0 ){
//            glDisable(GL_TEXTURE_2D);
            glCallList( obj->obj3D_id );
//            glEnable(GL_TEXTURE_2D);

        }
        glPopMatrix();
    }
}

void textObj_draw_bound( textObj * obj, int hbound, int vbound )
{
    double x,y;
    if(! obj->is_3D){
        x=0.0;
        y=0.0;
        if( hbound == HBOUND_CENTER )  x=-(double)(obj->quad_w)/2.0;
        if( hbound == HBOUND_RIGHT  )  x=-(double)(obj->quad_w);
        if( hbound == HBOUND_LEFT   )  x=0.0;
        if( vbound == VBOUND_CENTER )  y=-(double)(obj->quad_h)/2.0;
        if( vbound == VBOUND_TOP    )  y=-(double)(obj->quad_h);
        if( vbound == VBOUND_BOTTOM )  y=0.0;
        glPushMatrix();
        glTranslatef( x, y, 0.0 );
        if( obj->quad_id != 0 )
            glCallList( obj->quad_id );
        glPopMatrix();
    } else {
        x=0.0;
        y=0.0;
        if( hbound == HBOUND_CENTER )  x=-(double)(obj->obj3D_w)/2.0;
        if( hbound == HBOUND_RIGHT  )  x=-(double)(obj->obj3D_w);
        if( hbound == HBOUND_LEFT   )  x=0.0;
        if( vbound == VBOUND_CENTER )  y=-(double)(obj->obj3D_h)/2.0;
        if( vbound == VBOUND_TOP    )  y=-(double)(obj->obj3D_h);
        if( vbound == VBOUND_BOTTOM )  y=0.0;
        glPushMatrix();
        glTranslatef( x, y, 0.0 );
        if( obj->obj3D_id != 0 ){
//            glDisable(GL_TEXTURE_2D);
            glCallList( obj->obj3D_id );
//            glEnable(GL_TEXTURE_2D);
        }
        glPopMatrix();
    }
}

void textObj_delete( textObj * obj )
{
    if(! obj->is_3D){
        glDeleteLists( obj->quad_id, 1 );
        obj->quad_id=0;
        glDeleteTextures( 1, &(obj->tex_id) );
        obj->tex_id=0;
    } else {
        glDeleteLists( obj->obj3D_id, 1 );
        obj->obj3D_id=0;
    }
}

#endif