56 lines
1.9 KiB
Standard ML
56 lines
1.9 KiB
Standard ML
structure AAA =
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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 endXToNdc (xOffset, startX, endX, scale, halfWidth) =
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(((endX - startX) * 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 endYToNdc (yOffset, startY, endY, scale, halfHeight) =
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~((((endY - startY) * scale + yOffset) - halfHeight) / halfHeight)
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fun lerp (xOffset, yOffset, scale, windowWidth, windowHeight) =
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let
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val windowWidth = Real32.fromInt windowWidth
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val halfWidth = windowWidth / 2.0
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val windowHeight = Real32.fromInt windowHeight
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val halfHeight = windowHeight / 2.0
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in
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#[
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xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 2.000000000000000, scale, halfHeight),
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0.000000000000000,
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0.000000000000000,
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0.000000000000000,
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endXToNdc (xOffset, xToNdc (xOffset, 1.000000000000000, scale, halfWidth), 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 2.000000000000000, scale, halfHeight),
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0.000000000000000,
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0.000000000000000,
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0.000000000000000,
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xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 1.000000000000000, scale, halfHeight),
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0.000000000000000,
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0.000000000000000,
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0.000000000000000,
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xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 1.000000000000000, scale, halfHeight),
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0.000000000000000,
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0.000000000000000,
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0.000000000000000,
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endXToNdc (xOffset, xToNdc (xOffset, 1.000000000000000, scale, halfWidth), 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 2.000000000000000, scale, halfHeight),
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0.000000000000000,
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0.000000000000000,
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0.000000000000000,
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endXToNdc (xOffset, xToNdc (xOffset, 1.000000000000000, scale, halfWidth), 1.000000000000000, scale, halfWidth),
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yToNdc (yOffset, 1.000000000000000, scale, halfHeight),
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0.000000000000000,
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0.000000000000000,
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0.000000000000000
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]
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end
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end
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