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I am coding a wavefront (.obj) loader with VBO’s.
When “usemtl” is called, I am thinking about sending textureID together with vertex, texCoord and normal data.
With that texture ID can I bind the texture inside vertex/fragment shader without calling glBindTexture?
No. Textures are not bound to shaders; they’re bound to the context.
If you want to get technical, NV_bindless_texture allows such functionality, but that’s NVIDIA-specific.