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Alright, so these textures are really confusing me. I've been looking at this tutorial (which I think is great), particularly the image captioned with "You can define up to 32 Texture Units, but just up to 8 textures per shader.". As I understand it, here's how it works: You activate a texture unit. You then bind a texture object (analogous to the 'Texture Data' cubes in the image) to a certain target within that unit. So, glGenTextures to make the objects & get their names, and then glBindTexture to bind that texture to TEXTURE_2D or something (I'm not interested in other targets at the moment). Then you can specify the texture data with glTexImage2D. Now. I'm using 3 shader programs, each with different textures required. Here's what I want to do: In an initialization stage, I go through each of my texture units, and go glActiveTexture glBindTexture (operates on active texture unit) glTexImage2D (operates on currently bound object) and for the shaders, I glUniform to match a uniform in each shader to the 'i' value specified in GL_TEXTUREi of glActiveTexture. I need a total of only four textures, and they're pretty tiny. Now, during rendering, I should be able to switch programs fine, and everything works, right? Each program already has a uniform specifying which unit to use, and each unit already has an object bound to its TEXTURE_2D target, and each object has data specified by glTexImage2D, right? So no binding or activating units required in my render function? At least that's how I understood it, but I'm getting the wrong textures drawn in the wrong places. Furthermore, in one of my programs I want to switch between three textures for a single surface. So I figured I load each of the textures into an object, and bind each of the objects to a unit, then at render time I can

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