splash.cpp

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/***************************************************************************

    file                 : splash.cpp
    created              : Sat Mar 18 23:49:03 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.                                   *
 *                                                                         *
 ***************************************************************************/
#ifdef WIN32
#include <windows.h>
#define HAVE_CONFIG_H
#endif
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#include <portability.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tgfclient.h>

#include "splash.h"
#include "mainmenu.h"

static int s_imgWidth, s_imgHeight;
static GLuint s_texture = 0;
static int SplashDisplaying;

/*
 * Function
 *  splashKey
 *
 * Description
 *  
 *
 * Parameters
 *  
 *
 * Return
 *  
 *
 * Remarks
 *  
 */
static void splashKey( unsigned char /* key */, int /* x */, int /* y */)
{
    SplashDisplaying = 0;
    glDeleteTextures(1, &s_texture);
    s_texture = 0;
    TorcsMainMenuRun();
}

/*
 * Function
 *  
 *
 * Description
 *  
 *
 * Parameters
 *  
 *
 * Return
 *  
 *
 * Remarks
 *  
 */
static void splashTimer(int /* value */)
{
    if (SplashDisplaying) {
        SplashDisplaying = 0;
        glDeleteTextures(1, &s_texture);
        s_texture = 0;
        TorcsMainMenuRun();
    }
}
    

/*
 * Function
 *  splashDisplay
 *
 * Description
 *
 *
 * Parameters
 *  
 *
 * Return
 *  
 *
 * Remarks
 *  
 */
static void splashDisplay( void )
{
    int ScrW, ScrH, ViewW, ViewH;
    
    SplashDisplaying = 1;
        
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_LIGHTING);
    glDisable(GL_CULL_FACE);
    glDisable(GL_ALPHA_TEST);
    
    GfScrGetSize(&ScrW, &ScrH, &ViewW, &ViewH);
    
    glViewport((ScrW-ViewW) / 2, (ScrH-ViewH) / 2, ViewW, ViewH);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, ScrW, 0, ScrH);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
        
    if (s_texture != 0) {
        GLfloat tx1 = 0.0f, tx2 = 1.0f, ty1 = 0.0f, ty2 = 1.0f;
        
        // Compute texture coordinates to ensure proper unskewed/unstretched display of
        // image content.
        //tdble rfactor = (float)(s_imgWidth*ViewH)/(float)(s_imgHeight*ViewW);
        tdble rfactor = (16.0f*ViewH)/(10.0f*ViewW);

        if (rfactor >= 1.0f) {
            // Aspect ratio of view is smaller than 16:10, "cut off" sides
            tdble tdx = (1.0f-1.0f/rfactor)/2.0f;
            tx1 += tdx;
            tx2 -= tdx;
        } else {
            // Aspect ratio of view is larger than 16:10, "cut off" top and bottom
            tdble tdy = (1.0f-rfactor)/2.0f;
            ty1 += tdy;
            ty2 -= tdy;
        }

        glEnable(GL_TEXTURE_2D);
        glBindTexture(GL_TEXTURE_2D, s_texture);
        glBegin(GL_QUADS);
        glTexCoord2f(tx1, ty1); glVertex3f(0.0, 0.0, 0.0);
        glTexCoord2f(tx1, ty2); glVertex3f(0.0, ScrH, 0.0);
        glTexCoord2f(tx2, ty2); glVertex3f(ScrW, ScrH, 0.0);
        glTexCoord2f(tx2, ty1); glVertex3f(ScrW, 0.0, 0.0);
        glEnd();
        glDisable(GL_TEXTURE_2D);
    }
        
#ifdef HAVE_CONFIG_H
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0, 640, 0, 480);
    
    static float grWhite[4] = {1.0, 1.0, 1.0, 1.0};
    GfuiPrintString(VERSION, grWhite, GFUI_FONT_SMALL_C, 640-8, 8, GFUI_ALIGN_HR_VB);
#endif

    glutSwapBuffers();
}

static void splashMouse(int /* b */, int s, int /* x */, int /* y */)
{
    if (s == GLUT_UP) {
        SplashDisplaying = 0;
        glDeleteTextures(1, &s_texture);
        s_texture = 0;
        TorcsMainMenuRun();
    }
}


/*
 * Function
 *  
 *
 * Description
 *  
 *
 * Parameters
 *  
 *
 * Return
 *  
 *
 * Remarks
 *  
 */
int SplashScreen(void)
{
    void    *handle;
    float   screen_gamma;
    const char  *filename = "data/img/splash.png";
    const int BUFSIZE = 1024;
    char buf[BUFSIZE];
    
    if (s_texture != 0) {
        glDeleteTextures(1, &s_texture); 
    }
    
    snprintf(buf, BUFSIZE, "%s%s", GetLocalDir(), GFSCR_CONF_FILE);
    handle = GfParmReadFile(buf, GFPARM_RMODE_STD | GFPARM_RMODE_CREAT);
    screen_gamma = (float)GfParmGetNum(handle, GFSCR_SECT_PROP, GFSCR_ATT_GAMMA, (char*)NULL, 2.0); 
    GLbyte *tex = (GLbyte*)GfImgReadPng(filename, &s_imgWidth, &s_imgHeight, screen_gamma);
    GfParmReleaseHandle(handle);
    if (!tex) {
        GfTrace("Couldn't read %s\n", filename);
        return -1;
    }

    glGenTextures(1, &s_texture);
    glBindTexture(GL_TEXTURE_2D, s_texture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, s_imgWidth, s_imgHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)(tex));
    free(tex);
    
    glutDisplayFunc(splashDisplay);
    glutKeyboardFunc(splashKey);
    glutSpecialFunc((void (*)(int key, int x, int y))NULL);
    glutTimerFunc(7000, splashTimer, 0);
    glutMouseFunc(splashMouse);
    
    return 0;
}