mirror of
https://git.minetest.land/VoxeLibre/VoxeLibre.git
synced 2024-08-22 01:47:24 +02:00
33 lines
1.0 KiB
Lua
33 lines
1.0 KiB
Lua
|
dofile("init.lua")
|
||
|
|
||
|
-- This generates images necessary to colorize 16 Minetest nodes in 4096 colors.
|
||
|
-- It serves as a demonstration of what you can achieve using colormapped nodes.
|
||
|
-- It is be useful for grass or beam or glass nodes that need to blend smoothly.
|
||
|
|
||
|
-- Sample depth rescaling is done according to the algorithm presented in:
|
||
|
-- <https://www.w3.org/TR/2003/REC-PNG-20031110/#13Sample-depth-rescaling>
|
||
|
local max_sample_in = math.pow(2, 4) - 1
|
||
|
local max_sample_out = math.pow(2, 8) - 1
|
||
|
|
||
|
for r = 0,15 do
|
||
|
local pixels = {}
|
||
|
for g = 0,15 do
|
||
|
if nil == pixels[g + 1] then
|
||
|
pixels[g + 1] = {}
|
||
|
end
|
||
|
for b = 0,15 do
|
||
|
local color = {
|
||
|
math.floor((r * max_sample_out / max_sample_in) + 0.5),
|
||
|
math.floor((g * max_sample_out / max_sample_in) + 0.5),
|
||
|
math.floor((b * max_sample_out / max_sample_in) + 0.5),
|
||
|
}
|
||
|
pixels[g + 1][b + 1] = color
|
||
|
end
|
||
|
end
|
||
|
local filename = "colormap_" .. tostring(r) .. ".tga"
|
||
|
tga_encoder.image(pixels):save(
|
||
|
filename,
|
||
|
{ color_format="A1R5G5B5" } -- waste less bits
|
||
|
)
|
||
|
end
|