quickly dump OpenGL texture

gistfile1.cpp

glBindTexture(GL_TEXTURE_2D, textureID);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
GLint width, height, level = 0;
glGetTexLevelParameteriv(GL_TEXTURE_2D, level, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, level, GL_TEXTURE_HEIGHT, &height);
std::unique_ptr<unsigned short[]> data(new unsigned short[width * height]);
glGetTexImage(GL_TEXTURE_2D, level, GL_RED, GL_UNSIGNED_SHORT, data.get());
glPixelStorei(GL_PACK_ALIGNMENT, 4);