void create(int xsz, int ysz, TextureType type = TEX_2D, unsigned int ifmt = GL_RGBA);
void create_default(TextureType type = TEX_2D);
void create(int xsz, int ysz, TextureType type = TEX_2D, unsigned int ifmt = GL_RGBA);
void create_default(TextureType type = TEX_2D);