Usage.jl

function position_transformation(mvp::Matrix{Float32}, vertices::Vector3)
   return mvp * Vector4(vertices, 1f0)
end

cam = PerspectiveCamera(....)
color = Vector4(0, 1, 0, 1)

vertShader = [
"vertices" => GLBuffer([Vector3(0, 1, 0),   Vector3(0, 1, 0), Vector3(0, 0, 0)], primitiveMode = GL_TRIANGLES, drawMode = GL_STATIC_DRAW),
"mvp" => cam,
"gl_Position" => (position_transformation, (mvp::Matrix{Float32}, vertices::Vector3))
]

fragShader = [
"color" => color
"gl_FragColor" => (color::Vector4 -> color, (color::Vector4))
]
#Make the render object
renderTest = GLRenderObject(vertShader, fragShader)

#Define how you want to render the vertex array
push!(renderTest.postRenderFunctions, (x ->  glDrawArrays(x.vertArray.primitiveMode, 0, x.vertArray.size), (renderTest,)))

#register some action that manipulates the camera
registerEventAction(EventAction{MouseClicked}(x -> x.key == MOUSE_MIDDLE_DOWN || x.key == MOUSE_MIDDLE_UP, (), zoom, (cam,)))

#I don't have any code for this, but this should be fairly easy to implement
registerSlider(color)

#and then finally inside the glDrawLoop
render(renderTest)