Texture.cpp

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#include "Texture.h"
#include "QImage"

Texture::Texture(const std::string &_name):id(0),m_width(0),m_height(0),m_name(_name){}
Texture::~Texture(){}

void Texture::generateEmpty(int _width, int _height)
{
    m_height = _height;
    m_width = _width;

    glGenTextures(1, &id);
    glBindTexture(GL_TEXTURE_2D, id);

    // Set the texture's stretching properties
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
    glGenerateMipmap(GL_TEXTURE_2D);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,  m_width, m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
}

void Texture::generateEmptyf(int _width, int _height)
{
    m_height = _height;
    m_width = _width;

    glGenTextures(1, &id);
    glBindTexture(GL_TEXTURE_2D, id);

    // Set the texture's stretching properties
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB, m_width, m_height, 0, GL_RGBA, GL_FLOAT, 0);

    glBindTexture(GL_TEXTURE_2D, 0);
}

void Texture::generateDepth(int _width, int _height)
{
    m_height = _height;
    m_width = _width;

    glGenTextures(1, &id);
    glBindTexture(GL_TEXTURE_2D, id);

    // Set the texture's stretching properties
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE  );
    glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE  );
    glGenerateMipmap(GL_TEXTURE_2D);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32,  m_width, m_height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
}

void Texture::generateFromFile(char* _filePath)
{
    QImage *image = new QImage();
    bool loaded=image->load(_filePath);
    if(loaded == true)
    {
        int width=image->width();
        int height=image->height();
        unsigned char *data = new unsigned char[width*height*3];
        unsigned int index=0;
        QRgb colour;
        for( int y=0; y<height; ++y)
        {
            for( int x=0; x<width; ++x)
            {
                colour=image->pixel(x,y);

                data[index++]=qRed(colour);
                data[index++]=qGreen(colour);
                data[index++]=qBlue(colour);
            }
        }

        glGenTextures(1,&id);
        glBindTexture(GL_TEXTURE_2D,id);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);

        glTexImage2D(GL_TEXTURE_2D,0,3,width,height,0,GL_RGB,GL_UNSIGNED_BYTE,data);
        glGenerateMipmap(GL_TEXTURE_2D);
    }
}