View Full Version : texture2D vs textureLOD
01-20-2012, 05:38 AM
Can anybody explain me in short what is the difference between texture2D and textureLod, and when one should be preferred over the other?
01-20-2012, 05:54 AM
texture2D has been deprecated in favor of texture. However, if you are targeting GLSL 1.10 , you can still use texture2D.
texture2D is used in the fragment shader.
textureLod is used in the vertex shader since the derivatives are not computed. There are no derivatives because a vertex is just a point. You need to select the mipmap yourself.
Some texture functions (non-“Lod” and non-“Grad” versions) may require implicit derivatives. Implicit
derivatives are undefined within non-uniform control flow and for vertex shader texture fetches.
01-20-2012, 09:13 AM
Ok, and what is mipmap? (if this question is too stupid fell free not to answer...).
01-20-2012, 11:48 AM
Please read the Texture article on the OpenGL Wiki (http://www.opengl.org/wiki/Texture).
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