GlTexture.cpp

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#include "lvr2/display/GlTexture.hpp"
#include <iostream>

using namespace std;

namespace lvr2
{

GlTexture::GlTexture(unsigned char* pixels, int width, int height)
    : m_width(width), m_height(height),  m_pixels(pixels)
{
    m_texIndex = 0;
    // Upload texture
    upload();
}

GlTexture::GlTexture(const GlTexture &other)
{
    // Copy data
    m_width = other.m_width;
    m_height = other.m_height;
    m_pixels = new unsigned char[3 * m_width * m_height];
    m_texIndex = other.m_texIndex;
    for(int i = 0; i < 3 * m_width * m_height; i++)
    {
        m_pixels[i] = other.m_pixels[i];
    }

    // Upload texture
    upload();
}

GlTexture::GlTexture(const Texture &other)
{
    m_texIndex = 0;
    m_width = other.m_width;
    m_height = other.m_height;
    m_pixels = new unsigned char[3 * m_width * m_height];
    std::fill(m_pixels, m_pixels + 3 * m_width * m_height, 0);

    for (size_t i = 0; i < m_width * m_height; i++)
    {
            size_t current_idx = i * other.m_numChannels * other.m_numBytesPerChan;
            if (other.m_numChannels > 0)
            {
                m_pixels[i*3 + 0] = other.m_data[current_idx + other.m_numBytesPerChan * 0];
            }
            if (other.m_numChannels > 1)
            {
                m_pixels[i*3 + 1] = other.m_data[current_idx + other.m_numBytesPerChan * 1];
            }
            if (other.m_numChannels > 2)
            {
                m_pixels[i*3 + 2] = other.m_data[current_idx + other.m_numBytesPerChan * 2];
            }
    }

    // Upload texture
    upload();
}

GlTexture::~GlTexture()
{
    if(m_pixels)
    {
        delete[] m_pixels;
    }

    if (m_texIndex)
    {
        glDeleteTextures(1, &m_texIndex);
    }
}

void GlTexture::upload()
{
    glEnable(GL_TEXTURE_2D);
    // Create new texure list
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);                              // Set correct alignment
    glGenTextures(1, &m_texIndex);

    /*
    for(int i = 0; i < 3 * m_width * m_height; i++)
      {
        if(i % 3 == 0)
          {
            if((int)m_pixels[i] != 0 && (int)m_pixels[i] != 255)
              cout << endl;
          }
        if((int)m_pixels[i] != 0 && (int)m_pixels[i] != 255)
          cout << "GlTexture::upload -- " << (int)m_pixels[i] << " ";
      }
    */
    
    // Bind texture, setup parameters and upload it
    // to video memory
    glBindTexture(GL_TEXTURE_2D, m_texIndex);                           // Bind texture

    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);      // Set repeating and filtering
    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);        // Do not apply lighting

    // Upload texture
    glTexImage2D(
                 GL_TEXTURE_2D,
                 0,
                 GL_RGB,
                 m_width,
                 m_height,
                 0,
                 GL_RGB,
                 GL_UNSIGNED_BYTE,
                 m_pixels
                 );
}

} // namespace lvr2