Original Post
I am currently working on my own little 2d engine. the only problem I had was I had only glteximage2d to do all of my sprites, so I couldn't take frames from a sprite sheet. then I discovered gltexsubimage2d. the only problem I have is that the sprite displays as a white square. displaying it like a normal texture works fine, so I'm assuming that the rendering is fine, so here is what I have for the lines of code that seem important: is there something I'm not doing right? or could something else be the problem. thanks to whoever helps, this has been annoying me for nearly a week.
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, BMP.bmWidth, BMP.bmHeight, 0, GL_BGR, GL_UNSIGNED_BYTE, BMP.bmBits);//this line it loads and displays perfectly
//glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 64, 64, GL_BGR, GL_UNSIGNED_BYTE, BMP.bmBits);//this line should in theory work perfect too, but it doesn't work at all
