Star.cpp

/*
 *  Star.cpp
 *  Game
 *
 *  Created by David Reed, Matt Oldfield, Jeremy Sampson, Andrew Daugherty
 *  and Alex Martishius
 *  Copyright 2011. All rights reserved.
 *
 */


//---------------------------------------------------------

#include "Star.h"
#include <string>
#include <sstream>


using namespace std;

//---------------------------------------------------------

Star::Star()
{
	setKillsBottom(false);
	setKillsSide(false);
	setKillsTop(false);
	setPoints(0);
	setXVelocity(0.75);
	setYVelocity(0.0);
    
    sprite();        
    

}

//---------------------------------------------------------

Star::~Star()
{
}

//---------------------------------------------------------

void Star::draw(bool update)
{
    if (update){
        //Determine Texture Position
        if (texturePos < 3) {
            texturePos+=1;
        }
        else{
            texturePos = 0;
        }
    }
    
    //Set proper blending for alpha
	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_BLEND);
    glEnable( GL_TEXTURE_2D );
    glBindTexture( GL_TEXTURE_2D, texture_[texturePos]);
    
    //Draw QUAD
    glColor4f(0.7f,0.9f,1.0f,1.0f);
    glBegin( GL_QUADS );
    glTexCoord2d(0.0,0.0); glVertex2d(left(),bottom());
    glTexCoord2d(1.0,0.0); glVertex2d(right(),bottom());
    glTexCoord2d(1.0,1.0); glVertex2d(right(),top());
    glTexCoord2d(0.0,1.0); glVertex2d(left(),top());
    glEnd();
    
    //Disable unwanted gl modes
    glDisable(GL_BLEND);
    glDisable(GL_TEXTURE_2D);    
}

//---------------------------------------------------------

void Star::sprite()
{
    texturePos = 0;
    
    // Mac environment variable for home directory
    char *cHomeDir = NULL;
    
    cHomeDir = getenv("HOME");
    
    // I think Windows uses HOMEPATH
    if (!cHomeDir) {
        cHomeDir = getenv("HOMEPATH");
    }
    string homeDir = cHomeDir;
    string iName;
    homeDir += "/CS330/sprites/star";
    
    string pos;
    stringstream out;
    
    for (int i = 0; i<4; ++i) {
        stringstream out;
        //Generates Filename
        iName = homeDir;
        out<<i;
        pos = out.str();
        iName += pos;
        iName += ".tex";
        
        
        //Read in the texture file
        FILE *fp = fopen(iName.c_str(), "r");
        unsigned char *texture = new unsigned char[4 * 32* 32];
        if (fread(texture, sizeof(unsigned char), 4 * 32 * 32, fp)
            != 4* 32 *32) {
            fprintf(stderr, "error reading %s", iName.c_str());
        }
        fclose(fp);
        
        //Bind Texture to a GLuint
        glGenTextures(1, &texture_[i]);
        glBindTexture(GL_TEXTURE_2D, texture_[i]);
        
        //Set parameters for how the texture is displayed
        glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );        
        glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
                        GL_LINEAR_MIPMAP_NEAREST );
        glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
                        GL_LINEAR );        
        glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
                        GL_CLAMP );
        glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
                        GL_CLAMP );
        
        //Build Mipmap
        gluBuild2DMipmaps(GL_TEXTURE_2D, 4, 32, 32, GL_RGBA,
                          GL_UNSIGNED_BYTE, texture);
        delete [] texture;
    }
}