grutil.cpp

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/***************************************************************************
 
    file                 : grutil.cpp
    created              : Wed Nov  1 21:33:22 CET 2000
    copyright            : (C) 2000 by Eric Espie
    email                : torcs@free.fr
    version              : $Id$
 
***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include <math.h>
#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#ifdef WIN32
#include <windows.h>
#endif
#include <GL/glut.h>
#include <plib/ssg.h>
 
#include <tgfclient.h>
#include <portability.h>
 
#include "grutil.h"
#include "grmultitexstate.h"
#include "grscene.h"
#include "grtexture.h"
 
float grGammaValue = 1.8;
int grMipMap = 0;
 
char *grFilePath;         // Multiple path (';' separated) used to search for files.
char *grTexturePath = NULL;    // Default ssg path.
 
 
int grGetFilename(const char *filename, char *filepath, char *buf, const int BUFSIZE)
{
    char *c1, *c2;
    int found = 0;
    int lg;
    int flen = strlen(filename);
 
    if (filepath) {
        c1 = filepath;
        c2 = c1;
        while ((!found) && (c2 != NULL)) {
            c2 = strchr(c1, ';');
            if (c2 == NULL) {
                snprintf(buf, BUFSIZE, "%s/%s", c1, filename);
            } else {
                lg = c2 - c1;
                if (lg + flen + 2 < BUFSIZE) {
                    strncpy(buf, c1, lg);
                    buf[lg] = '/';
                    strcpy(buf + lg + 1, filename);
                } else {
                    buf[0] = '\0';
                }
            }
            if (ulFileExists(buf)) {
                found = 1;
            }
            c1 = c2 + 1;
        }
    } else {
        strncpy(buf, filename, BUFSIZE);
        if (ulFileExists(buf)) {
            found = 1;
        }
    }
    if (!found) {
        GfOut("File %s not found\n", filename);
        GfOut("File Path was %s\n", filepath);
        return 0;
    }
 
    return 1;
}
 
 
bool grLoadPngTexture (const char *fname, ssgTextureInfo* info)
{
    GLubyte *tex;
    int w, h;
    int mipmap = 1;
 
    TRACE_GL("Load: grLoadPngTexture start");
 
    tex = (GLubyte*)GfImgReadPng(fname, &w, &h, 2.0);
    if (!tex) {
        return false;
    }
 
    if (info) {
        info -> width  = w;
        info -> height = h;
        info -> depth  = 4;
        info -> alpha  = true;
    }
 
    TRACE_GL("Load: grLoadPngTexture stop");
 
    // TODO: Check if tex is freed.
    //       Check/fix potential problems related to malloc/delete mixture
    //       (instead of malloc/free or new/delete).
 
    mipmap = doMipMap(fname, mipmap);
 
    GLubyte* tex2 = new GLubyte[w*h*4];
    memcpy(tex2, tex, w*h*4);
    free(tex);
    tex = tex2;
    
    return grMakeMipMaps(tex, w, h, 4, mipmap);
}
 
 
 
typedef struct stlist
{
    struct stlist *next;
    struct stlist   *prev;
    grManagedState *state;
    char        *name;  
} stlist;
 
 
static stlist * stateList = NULL;
 
 
static grManagedState * grGetState(char *img)
{
    stlist    *curr;
 
    curr = stateList;
    while (curr != NULL) {
    if (strcmp(curr->name, img) == 0) {
        return curr->state;
    }
    curr = curr->next;
    }
    return NULL;
}
 
 
void grRemoveState(char* img)
{
    stlist    *curr;
 
    curr = stateList;
    while (curr != NULL) {
        if (strcmp(curr->name, img) == 0) {
            if (curr->prev != 0) {
                curr->prev->next = curr->next;
            }
            if (curr->next != 0) {
                curr->next->prev = curr->prev;
            }
            if (curr == stateList) {
                stateList = curr->next;
            }
 
            free(curr->name);
            free(curr);
            break;
        }
        curr = curr->next;
    }   
}
 
 
void grShutdownState(void)
{
    stlist *curr;
    stlist *next;
 
    curr = stateList;
    while (curr != NULL) {
        next = curr->next;
        printf("Still in list : %s\n", curr->name);
        free(curr->name);
        free(curr);
        curr = next;
    }
    stateList = NULL;
}
 
 
static void grSetupState(grManagedState *st, char *buf)
{
    st->enable(GL_LIGHTING);
    st->enable(GL_TEXTURE_2D);
    st->enable(GL_BLEND);
    st->setColourMaterial(GL_AMBIENT_AND_DIFFUSE);  
 
    stlist *curr = (stlist*)calloc(sizeof(stlist), 1);
    curr->next = stateList;
    if (stateList != NULL) {
        stateList->prev = curr;
    }
    stateList = curr;
    curr->state = st;
    curr->name = strdup(buf);
 
    GfOut("Loading %s\n", buf);
}
 
 
ssgState * grSsgLoadTexState(const char *img)
{
    const int BUFSIZE = 1024;
    char buf[BUFSIZE];
    const char *s;
    grManagedState *st; 
 
    // remove the directory
    s = strrchr(img, '/');
    if (s == NULL) {
        s = img;
    } else {
        s++;
    }
 
    if (!grGetFilename(s, grFilePath, buf, BUFSIZE)) {
        GfOut("grSsgLoadTexState: File %s not found\n", s);
        return NULL;
    }
 
    st = grGetState(buf);
    if (st != NULL) {
        return (ssgState*)st;
    }
 
    st = grStateFactory();
    grSetupState(st, buf);
    st->setTexture(buf);
    
    return (ssgState*)st;
}
 
ssgState * grSsgEnvTexState(const char *img)
{
    const int BUFSIZE = 1024;
    char buf[BUFSIZE];
    const char *s;
    grManagedState *st;
 
    // remove the directory
    s = strrchr(img, '/');
    if (s == NULL) {
        s = img;
    } else {
        s++;
    }
 
    if (!grGetFilename(s, grFilePath, buf, BUFSIZE)) {
        GfOut("grSsgLoadTexState: File %s not found\n", s);
        return NULL;
    }
 
    /*st = grGetState(buf);
    if (st != NULL) {
        return (ssgState*)st;
    }*/
 
    st = new grMultiTexState();
    grSetupState(st, buf);
    st->setTexture(buf);
 
    return (ssgState*)st;
}
 
ssgState *
grSsgLoadTexStateEx(const char *img, char *filepath, int wrap, int mipmap)
{
    const int BUFSIZE = 1024;
    char buf[BUFSIZE];
    const char *s;
    grManagedState *st; 
 
    // remove the directory
    s = strrchr(img, '/');
    if (s == NULL) {
        s = img;
    } else {
        s++;
    }
 
    if (!grGetFilename(s, filepath, buf, BUFSIZE)) {
        GfOut("File %s not found\n", s);
        return NULL;
    }
 
    st = grGetState(buf);
    if (st != NULL) {
        return (ssgState*)st;
    }
 
    st = grStateFactory();
    grSetupState(st, buf);
    st->setTexture(buf, wrap, wrap, mipmap);
 
    return (ssgState*)st;
}
 
 
void  grWriteTime(float *color, int font, int x, int y, tdble sec, int sgn)
{
    const int BUFSIZE = 256;
    char  buf[BUFSIZE];
    const char* sign;
 
    if (sec < 0.0) {
        sec = -sec;
        sign = "-";
    } else {
        if (sgn) {
            sign = "+";
        } else {
            sign = "  ";
        }
    }
 
    int h = (int)(sec / 3600.0);
    sec -= 3600 * h;
    int m = (int)(sec / 60.0);
    sec -= 60 * m;
    int s = (int)(sec);
    sec -= s;
    int c = (int)floor((sec) * 100.0);
    if (h) {
        (void)snprintf(buf, BUFSIZE, "%s%2.2d:%2.2d:%2.2d:%2.2d", sign,h,m,s,c);
    } else if (m) {
        (void)snprintf(buf, BUFSIZE, "   %s%2.2d:%2.2d:%2.2d", sign,m,s,c);
    } else {
        (void)snprintf(buf, BUFSIZE, "      %s%2.2d:%2.2d", sign,s,c);
    }
 
    GfuiPrintString(buf, color, font, x, y, GFUI_ALIGN_HR_VB);
}
 
 
// TODO: more efficient solution, this one is slow.
float grGetHOT(float x, float y)
{
    sgVec3 test_vec;
    sgMat4 invmat;
    sgMakeIdentMat4(invmat);
 
    invmat[3][0] = -(x - grRenderOrigin[0]);
    invmat[3][1] = -(y - grRenderOrigin[1]);
    invmat[3][2] =  0.0f         ;
 
    test_vec [0] = 0;
    test_vec [1] = 0;
    test_vec [2] = 100000.0f;
 
    ssgHit *results;
    int num_hits = ssgHOT (TheScene, test_vec, invmat, &results);
    float hot = -1000000.0f;
 
    for (int i = 0; i < num_hits; i++) {
        ssgHit *h = &results[i];
 
        float hgt = (h->plane[2] == 0.0 ? 0.0 : - h->plane[3] / h->plane[2]);
 
        if (hgt >= hot) {
            hot = hgt;
        }
    }
 
    return hot;
}