Heightmap() [2/2]

Heightmap::Heightmap

(

const std::string

path

)

Definition at line 9 of file Heightmap.cpp.

{
    m_Path = path;
    int width, height, channels;
    stbi_set_flip_vertically_on_load(0);
    void* data = stbi_load_16(path.c_str(), &width, &height, &channels, 1);
    if (!data)
    {
        std::cout << "Failed to load heightmap (" << path << "): " << stbi_failure_reason() << std::endl;
        return;
    }
    m_Data = static_cast<uint16_t*>(data);
    m_Width = width;
    m_Height = height;
 
    glGenTextures(1, &m_RendererID);
    glBindTexture(GL_TEXTURE_2D, m_RendererID);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 
    std::vector<uint8_t> texData;
    for (int i = 0; i < width * height; ++i)
    {
        uint8_t value = static_cast<float>(m_Data[i]) / (2 << 15) * 255;
        texData.push_back(value);
        texData.push_back(value);
        texData.push_back(value);
        texData.push_back(255);
    }
 
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, texData.data());
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glGenerateMipmap(GL_TEXTURE_2D);
}