mirror of
https://github.com/tanema/light_world.lua.git
synced 2024-12-24 20:24:19 +00:00
51 lines
1.2 KiB
Lua
51 lines
1.2 KiB
Lua
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height_map = {}
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function height_map.toNormalMap(heightMap, strength)
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local imgData = heightMap:getData()
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local imgData2 = love.image.newImageData(heightMap:getWidth(), heightMap:getHeight())
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local red, green, blue, alpha
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local x, y
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local matrix = {}
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matrix[1] = {}
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matrix[2] = {}
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matrix[3] = {}
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strength = strength or 1.0
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for i = 0, heightMap:getHeight() - 1 do
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for k = 0, heightMap:getWidth() - 1 do
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for l = 1, 3 do
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for m = 1, 3 do
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if k + (l - 1) < 1 then
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x = heightMap:getWidth() - 1
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elseif k + (l - 1) > heightMap:getWidth() - 1 then
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x = 1
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else
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x = k + l - 1
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end
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if i + (m - 1) < 1 then
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y = heightMap:getHeight() - 1
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elseif i + (m - 1) > heightMap:getHeight() - 1 then
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y = 1
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else
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y = i + m - 1
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end
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local red, green, blue, alpha = imgData:getPixel(x, y)
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matrix[l][m] = red
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end
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end
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red = (255 + ((matrix[1][2] - matrix[2][2]) + (matrix[2][2] - matrix[3][2])) * strength) / 2.0
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green = (255 + ((matrix[2][2] - matrix[1][1]) + (matrix[2][3] - matrix[2][2])) * strength) / 2.0
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blue = 192
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imgData2:setPixel(k, i, red, green, blue)
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end
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end
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return love.graphics.newImage(imgData2)
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end
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return height_map
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