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glGenTextures(1, &textureid); Assuming that the texture was created succesfully, could textureid be 0?
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A texture is an OpenGL Object that contains one or more images that all have the same image format. A texture can be used in two ways: it can be the source of a texture access from a Shader, or it can be used as a render target.
Texture units are references to texture objects that can be sampled in a shader. Textures are bound to texture units using the glBindTexture function you've used before. Because you didn't explicitly specify which texture unit to use, the texture was bound to GL_TEXTURE0 .
There are three kinds of storage for textures: mutable storage, immutable storage, and buffer storage. Only Buffer Textures can use buffer storage, where the texture gets its storage from a Buffer Object. And similarly, buffer textures cannot use mutable or immutable storage.
The manual page for glGenTextures says see also glIsTexture; the latter will (according to that) always return GL_FALSE for a texture name of 0. So, 0 can't be a valid texture name.
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