mirror of
https://github.com/appgurueu/modlib.git
synced 2024-08-20 21:34:10 +02:00
331 lines
6.6 KiB
Lua
331 lines
6.6 KiB
Lua
local texmod = {}
|
|
local metatable = {__index = texmod}
|
|
|
|
local function new(self)
|
|
return setmetatable(self, metatable)
|
|
end
|
|
|
|
-- `texmod{...}` may be used to create texture modifiers, bypassing the checks
|
|
setmetatable(texmod, {__call = new})
|
|
|
|
-- Constructors / "generators"
|
|
|
|
function texmod.file(filename)
|
|
return new{
|
|
type = "file",
|
|
filename = filename
|
|
}
|
|
end
|
|
|
|
function texmod.png(data)
|
|
assert(type(data) == "string")
|
|
return new{
|
|
type = "png",
|
|
data = data
|
|
}
|
|
end
|
|
|
|
function texmod.combine(w, h, blits)
|
|
assert(w % 1 == 0 and w > 0)
|
|
assert(h % 1 == 0 and h > 0)
|
|
for _, blit in ipairs(blits) do
|
|
assert(blit.x % 1 == 0)
|
|
assert(blit.y % 1 == 0)
|
|
assert(blit.texture)
|
|
end
|
|
return new{
|
|
type = "combine",
|
|
w = w,
|
|
h = h,
|
|
blits = blits
|
|
}
|
|
end
|
|
|
|
function texmod.inventorycube(top, left, right)
|
|
return new{
|
|
type = "inventorycube",
|
|
top = top,
|
|
left = left,
|
|
right = right
|
|
}
|
|
end
|
|
|
|
-- Methods / "modifiers"
|
|
|
|
function texmod:overlay(overlay)
|
|
return new{
|
|
type = "overlay",
|
|
base = self,
|
|
over = overlay
|
|
}
|
|
end
|
|
|
|
function texmod:brighten()
|
|
return new{
|
|
type = "brighten",
|
|
base = self,
|
|
}
|
|
end
|
|
|
|
function texmod:noalpha()
|
|
return new{
|
|
type = "noalpha",
|
|
base = self
|
|
}
|
|
end
|
|
|
|
function texmod:resize(w, h)
|
|
assert(w % 1 == 0 and w > 0)
|
|
assert(h % 1 == 0 and h > 0)
|
|
return new{
|
|
type = "resize",
|
|
base = self,
|
|
w = w,
|
|
h = h,
|
|
}
|
|
end
|
|
|
|
local function assert_uint8(num)
|
|
assert(num % 1 == 0 and num >= 0 and num <= 0xFF)
|
|
end
|
|
|
|
function texmod:makealpha(r, g, b)
|
|
assert_uint8(r); assert_uint8(g); assert_uint8(b)
|
|
return new{
|
|
type = "makealpha",
|
|
base = self,
|
|
r = r, g = g, b = b
|
|
}
|
|
end
|
|
|
|
function texmod:opacity(ratio)
|
|
assert_uint8(ratio)
|
|
return new{
|
|
type = "opacity",
|
|
base = self,
|
|
ratio = ratio
|
|
}
|
|
end
|
|
|
|
local function tobool(val)
|
|
return not not val
|
|
end
|
|
|
|
function texmod:invert(channels --[[set with keys "r", "g", "b", "a"]])
|
|
return new{
|
|
type = "invert",
|
|
base = self,
|
|
r = tobool(channels.r),
|
|
g = tobool(channels.g),
|
|
b = tobool(channels.b),
|
|
a = tobool(channels.a)
|
|
}
|
|
end
|
|
|
|
function texmod:flip(flip_axis --[["x" or "y"]])
|
|
return self:transform(assert(
|
|
(flip_axis == "x" and "fx")
|
|
or (flip_axis == "y" and "fy")
|
|
or (not flip_axis and "i")))
|
|
end
|
|
|
|
function texmod:rotate(deg)
|
|
assert(deg % 90 == 0)
|
|
deg = deg % 360
|
|
return self:transform(("r%d"):format(deg))
|
|
end
|
|
|
|
-- D4 group transformations (see https://proofwiki.org/wiki/Definition:Dihedral_Group_D4),
|
|
-- represented using indices into a table of matrices
|
|
-- TODO (...) try to come up with a more elegant solution
|
|
do
|
|
-- Matrix multiplication for composition: First applies a, then b <=> b * a
|
|
local function mat_2x2_compose(a, b)
|
|
local a_1_1, a_1_2, a_2_1, a_2_2 = unpack(a)
|
|
local b_1_1, b_1_2, b_2_1, b_2_2 = unpack(b)
|
|
return {
|
|
a_1_1 * b_1_1 + a_2_1 * b_1_2, a_1_2 * b_1_1 + a_2_2 * b_1_2;
|
|
a_1_1 * b_2_1 + a_2_1 * b_2_2, a_1_2 * b_2_1 + a_2_2 * b_2_2
|
|
}
|
|
end
|
|
local r90 ={
|
|
0, -1;
|
|
1, 0
|
|
}
|
|
local fx = {
|
|
-1, 0;
|
|
0, 1
|
|
}
|
|
local fy = {
|
|
1, 0;
|
|
0, -1
|
|
}
|
|
local r180 = mat_2x2_compose(r90, r90)
|
|
local r270 = mat_2x2_compose(r180, r90)
|
|
local fxr90 = mat_2x2_compose(fx, r90)
|
|
local fyr90 = mat_2x2_compose(fy, r90)
|
|
local transform_mats = {[0] = {1, 0; 0, 1}, r90, r180, r270, fx, fxr90, fy, fyr90}
|
|
local transform_idx_by_name = {i = 0, r90 = 1, r180 = 2, r270 = 3, fx = 4, fxr90 = 5, fy = 6, fyr90 = 7}
|
|
-- Lookup tables for getting the flipped axis / rotation angle
|
|
local flip_by_idx = {
|
|
[4] = "x",
|
|
[5] = "x",
|
|
[6] = "y",
|
|
[7] = "y",
|
|
}
|
|
local rot_by_idx = {
|
|
[1] = 90,
|
|
[2] = 180,
|
|
[3] = 270,
|
|
[5] = 90,
|
|
[7] = 90,
|
|
}
|
|
local idx_by_mat_2x2 = {}
|
|
local function transform_idx(mat)
|
|
-- note: assumes mat[i] in {-1, 0, 1}
|
|
return mat[1] + 3*(mat[2] + 3*(mat[3] + 3*mat[4]))
|
|
end
|
|
for i = 0, 7 do
|
|
idx_by_mat_2x2[transform_idx(transform_mats[i])] = i
|
|
end
|
|
-- Compute a multiplication table
|
|
local composition_idx = {}
|
|
local function ij_idx(i, j)
|
|
return i*8 + j
|
|
end
|
|
for i = 0, 7 do
|
|
for j = 0, 7 do
|
|
composition_idx[ij_idx(i, j)] = assert(idx_by_mat_2x2[
|
|
transform_idx(mat_2x2_compose(transform_mats[i], transform_mats[j]))])
|
|
end
|
|
end
|
|
function texmod:transform(...)
|
|
if select("#", ...) == 0 then return self end
|
|
local idx = ...
|
|
if type(idx) == "string" then
|
|
idx = assert(transform_idx_by_name[idx:lower()])
|
|
end
|
|
local base = self
|
|
if self.type == "transform" then
|
|
-- Merge with a `^[transform` base image
|
|
assert(transform_mats[idx])
|
|
base = self.base
|
|
idx = composition_idx[ij_idx(self.idx, idx)]
|
|
end
|
|
assert(transform_mats[idx])
|
|
if idx == 0 then return base end -- identity
|
|
return new{
|
|
type = "transform",
|
|
base = base,
|
|
idx = idx,
|
|
-- Redundantly store this information for convenience. Do not modify!
|
|
flip_axis = flip_by_idx[idx],
|
|
rotation_deg = rot_by_idx[idx] or 0,
|
|
}:transform(select(2, ...))
|
|
end
|
|
end
|
|
|
|
function texmod:verticalframe(framecount, frame)
|
|
assert(framecount >= 1)
|
|
assert(frame >= 0)
|
|
return new{
|
|
type = "verticalframe",
|
|
base = self,
|
|
framecount = framecount,
|
|
frame = frame
|
|
}
|
|
end
|
|
|
|
local function crack(self, name, ...)
|
|
local tilecount, framecount, frame
|
|
if select("#", ...) == 2 then
|
|
tilecount, framecount, frame = 1, ...
|
|
else
|
|
assert(select("#", ...) == 3, "invalid number of arguments")
|
|
tilecount, framecount, frame = ...
|
|
end
|
|
assert(tilecount >= 1)
|
|
assert(framecount >= 1)
|
|
assert(frame >= 0)
|
|
return new{
|
|
type = name,
|
|
base = self,
|
|
tilecount = tilecount,
|
|
framecount = framecount,
|
|
frame = frame
|
|
}
|
|
end
|
|
|
|
function texmod:crack(...)
|
|
return crack(self, "crack", ...)
|
|
end
|
|
|
|
function texmod:cracko(...)
|
|
return crack(self, "cracko", ...)
|
|
end
|
|
texmod.crack_with_opacity = texmod.cracko
|
|
|
|
function texmod:sheet(w, h, x, y)
|
|
assert(w % 1 == 0 and w >= 1)
|
|
assert(h % 1 == 0 and h >= 1)
|
|
assert(x % 1 == 0 and x < w)
|
|
assert(y % 1 == 0 and y < w)
|
|
return new{
|
|
type = "sheet",
|
|
base = self,
|
|
w = w,
|
|
h = h,
|
|
x = x,
|
|
y = y
|
|
}
|
|
end
|
|
|
|
local colorspec = modlib.minetest.colorspec
|
|
|
|
function texmod:multiply(color)
|
|
return new{
|
|
type = "multiply",
|
|
base = self,
|
|
color = colorspec.from_any(color) -- copies a given colorspec
|
|
}
|
|
end
|
|
|
|
function texmod:colorize(color, ratio)
|
|
color = colorspec.from_any(color) -- copies a given colorspec
|
|
if ratio == "alpha" then
|
|
assert(color.alpha or 0xFF == 0xFF)
|
|
else
|
|
ratio = ratio or color.alpha
|
|
assert_uint8(ratio)
|
|
if color.alpha == ratio then
|
|
ratio = nil
|
|
end
|
|
end
|
|
return new{
|
|
type = "colorize",
|
|
base = self,
|
|
color = color,
|
|
ratio = ratio
|
|
}
|
|
end
|
|
|
|
function texmod:mask(mask)
|
|
return new{
|
|
type = "mask",
|
|
base = self,
|
|
mask = mask
|
|
}
|
|
end
|
|
|
|
function texmod:lowpart(percent, overlay)
|
|
assert(percent % 1 == 0 and percent >= 0 and percent <= 100)
|
|
return new{
|
|
type = "lowpart",
|
|
base = self,
|
|
percent = percent,
|
|
over = overlay
|
|
}
|
|
end
|
|
|
|
return texmod, metatable
|