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How to pass voxel data to shader?

I know you can only pass the same variables for all vertex/fragments, but how can you pass an entire array of voxel data into a shader? Here's some methods I can think of: As part of the vertices. ...
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GLSL Shader r GL_INVALID_OPERATION from glUniform1f error with textureSize

The reason it does not work is because I'm using LibGDX and by default the opengl version is 2 which is not compatible with the function textureSize. A workaround ...
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