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Knowing when to use a texture in the fragment shader

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Hi, I am just starting with GLSL, and I came across a problem: not all the objects in my scene have got a texture. Still, the fragment shader always calculates the texture color:
texture2D(tex1,gl_TexCoord[0].st);
How can I check if I should draw the texture?

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This topic is 3579 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

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