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## Uniform
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Uniform variable qualifier.
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2015-05-01 20:05:55 +00:00
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### Example
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```glsl
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uniform vec4 direction;
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```
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### Description
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```uniform``` variables contain read-only data shared from WebGL/OpenGL environment to a vertex or fragment shader.
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The value is per primitive, so is useful for variables which remain constant along a primitive, frame or scene.
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### See Also
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[attribute](/glossary/?search=attribute), [const](/glossary/?search=const), [varying](/glossary/?search=varying), [Chapter 03: Uniforms](/03/)
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