44 lines
1.7 KiB
Haskell
44 lines
1.7 KiB
Haskell
module MatrixHelper
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where
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import Geometry
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import Linear.Matrix
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import Linear.V4
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import Graphics.Rendering.OpenGL (GLfloat)
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perspectiveMatrix :: Float -> Float -> Point2 -> Point2 -> Point2 -> [GLfloat]
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perspectiveMatrix rot zoom (tranx,trany) (winx,winy) (viewFromx,viewFromy) =
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let scalMat = Linear.Matrix.transpose $ V4
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(V4 (2*zoom/winx) 0 0 (0::GLfloat))
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(V4 0 (2*zoom/winy) 0 0)
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(V4 0 0 0.5 0) --scaled to make walls shorter
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(V4 0 0 0 1)
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rotMat = Linear.Matrix.transpose $
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V4 (V4 (cos rot) (sin (-rot)) 0 0)
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(V4 (sin rot) (cos rot) 0 0)
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(V4 0 0 1 0)
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(V4 0 0 0 1)
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tranMat3 = Linear.Matrix.transpose $
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V4 (V4 1 0 0 0)
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(V4 0 1 0 0)
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(V4 0 0 1 0)
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(V4 (-tranx) (-trany) 0 1)
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tranMat2 = Linear.Matrix.transpose $
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V4 (V4 1 0 0 0)
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(V4 0 1 0 0)
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(V4 0 0 1 0)
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(V4 (viewFromx-tranx) (viewFromy-trany) 0 1)
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perMat = Linear.Matrix.transpose $
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V4 (V4 1 0 0 0)
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(V4 0 1 0 0)
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(V4 0 0 1 1)
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(V4 0 0 0 1)
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tranMat1 = Linear.Matrix.transpose $
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V4 (V4 1 0 0 0)
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(V4 0 1 0 0)
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(V4 0 0 1 0)
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(V4 (-viewFromx) (-viewFromy) 0 1)
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wmat = scalMat !*! rotMat !*! tranMat2 !*! perMat !*! tranMat1
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vToL (V4 a b c d) = [a,b,c,d]
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in concatMap vToL $ vToL wmat
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