42 lines
1.2 KiB
Standard ML
42 lines
1.2 KiB
Standard ML
structure PipeCursor =
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struct
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fun xToNdc (xOffset, xpos, scale, halfWidth) =
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((xpos * scale + xOffset) - halfWidth) / halfWidth
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fun yToNdc (yOffset, ypos, scale, halfHeight) =
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~(((ypos * scale + yOffset) - halfHeight) / halfHeight)
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fun lerp (xOffset: Real32.real, yOffset, z, scale, windowWidth, windowHeight, r, g, b) =
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let
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val halfWidth = windowWidth / 2.0
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val halfHeight = windowHeight / 2.0
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in
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#[
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xToNdc (xOffset, 0.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 13.000000000000000, scale, halfHeight),
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z,
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r, g, b,
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xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 13.000000000000000, scale, halfHeight),
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z,
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r, g, b,
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xToNdc (xOffset, 0.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 0.000000000000000, scale, halfHeight),
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z,
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r, g, b,
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xToNdc (xOffset, 0.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 0.000000000000000, scale, halfHeight),
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z,
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r, g, b,
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xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 13.000000000000000, scale, halfHeight),
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z,
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r, g, b,
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xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 0.000000000000000, scale, halfHeight),
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z,
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r, g, b
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]
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end
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end
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