Time for action – generating an OpenGL texture

The image buffer filled by libpng now contains raw texture data. The next step is to generate a texture from it:

1. Let's continue our previous method which is GraphicsManager::loadTexture().

   Generate a new texture identifier with glGenTextures().

   Indicate that we are working on a texture with glBindTexture().

   Configure texture parameters with glTexParameteri() to specify the way a texture is filtered and wrapped. Use GL_NEAREST, as smoothing is not essential for a 2D game without zoom effects. Texture repetition is also not necessary and can be prevented with GL_CLAMP_TO_EDGE:

   ...
       png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
       delete[] rowPtrs;
   
       GLenum errorResult;
       glGenTextures(1, &texture);
       glBindTexture(GL_TEXTURE_2D, texture);
       // Set-up texture properties.
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
           GL_NEAREST);
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
           GL_NEAREST...