gistfile1.cpp

    Texture2D::Texture2D(Resource* image,
                         GLenum wrapping_mode,
                         GLenum min_mag_filter):Texture(GL_TEXTURE_2D) {
      unsigned error;
      unsigned char* imageData;
      unsigned w, h;
      GLenum texture_format;

      //
      // Load PNG
      //

      texture_format = GL_RGBA;
      error = LodePNG_decode32(&imageData, &w, &h,
                               (const unsigned char*)image->get_data(),
                               image->get_size());

      if (error) {
        throw Exception("PNG load error: " + std::string(LodePNG_error_text(error)));
      }

      width_ = w;
      height_ = h;

      Bind();
      SetParameteri(GL_TEXTURE_MIN_FILTER, min_mag_filter);
      SetParameteri(GL_TEXTURE_MAG_FILTER, min_mag_filter);
      SetParameteri(GL_TEXTURE_WRAP_S, wrapping_mode);
      SetParameteri(GL_TEXTURE_WRAP_T, wrapping_mode);
      glTexImage2D(target_,
                   0, texture_format,
                   width_, height_,
                   0, texture_format, GL_UNSIGNED_BYTE,
                   imageData);
      glGenerateMipmap(GL_TEXTURE_2D);
      free(imageData);
      Unbind();
    }