MusicVisualizer.txt

--@name Music Visualizer
--@author Sparky
--@client

local buffers = {"RT", "RT2"}
local buffernum = 1
render.createRenderTarget("RT")
render.createRenderTarget("RT2")
local centerTransform = Matrix()
centerTransform:setTranslation(Vector(512, 512, 0))

bass.loadFile("sound/music/hl2_song14.mp3","3d",function(snd)
	hook.add("render","",function()
		snd:setPos(render.getScreenEntity():getPos())
		local n = 64
		local fft = snd:getFFT(n)

		local nextbuffer = (buffernum%#buffers)+1
		render.setRenderTargetTexture(buffers[buffernum])
		render.selectRenderTarget(buffers[nextbuffer])
		render.clear(Color(0,0,0,255))
		render.setColor(Color(255, 255, 255, 200))
		render.drawTexturedRect(-15, -15, 1054, 1054)
		render.setColor(Color((timer.curtime()*10+180)%360-180, 1, 1):hsvToRGB())
		
		render.pushMatrix(centerTransform)
		local function fftToRadius(i) return 200-math.log10(i)*(fft[i] or 0)*1000 end
		local startr = fftToRadius(2)
		local lx, ly = startr, 0
		for i=3, n do
			local r = fftToRadius(i)
			local theta = (i-2)*2*math.pi/(n-1)
			local x, y = r*math.cos(theta), r*math.sin(theta)
			render.drawLine(x, y, lx, ly)
			lx = x
			ly = y
		end
		render.drawLine(startr, 0, lx, ly)
		
		render.popMatrix()
		render.selectRenderTarget()
		
		render.setColor(Color(255, 255, 255, 255))
		render.setRenderTargetTexture(buffers[nextbuffer])
		render.drawTexturedRect(0, 0, 512, 512)
		buffernum = nextbuffer
	end)
end)