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Update shaders.md

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Terkel
2016-11-10 22:50:29 -08:00
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shaders.md
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@@ -20,6 +20,9 @@ vec2 p = gl_FragCoord.xy / iResolution;
### GLSL Vertex Shaders
### uniforms:
These are a class of global variable that can be defined in GLSL shaders. They represent values that are uniform (unchanging) over the course of a rendering operation. Their values are set from outside of the shader, and they cannot be changed from within a shader.
### Swizzling
Beyond being a great name — is a nice feature in GLSL for accessing the properties of a vector.
You can get a single float from a vector using .r, .g, .b or .a. For example: