From 3e2687f82d3e42a01629f8939caf3bc5cb369797 Mon Sep 17 00:00:00 2001
From: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>
Date: Tue, 28 Dec 2021 18:32:40 +0000
Subject: [PATCH] Add soft circle brush

---
 .../lib/sculpt/brushes/circle_soft1.lua       | 56 +++++++++++++++++++
 worldeditadditions/lib/sculpt/init.lua        |  3 +-
 2 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 worldeditadditions/lib/sculpt/brushes/circle_soft1.lua

diff --git a/worldeditadditions/lib/sculpt/brushes/circle_soft1.lua b/worldeditadditions/lib/sculpt/brushes/circle_soft1.lua
new file mode 100644
index 0000000..dac76b0
--- /dev/null
+++ b/worldeditadditions/lib/sculpt/brushes/circle_soft1.lua
@@ -0,0 +1,56 @@
+local wea = worldeditadditions
+local Vector3 = wea.Vector3
+
+
+return function(size)
+	local brush = {}
+	
+	local centre = (size / 2):floor()
+	local minsize = math.floor(math.min(size.x, size.y) / 2)
+	
+	local border = 1
+	local kernel_size = 3
+	local kernel_size_vec = {}
+	kernel_size_vec[0] = kernel_size
+	kernel_size_vec[1] = kernel_size
+	
+	-- Make the circle
+	-- We don't use 0 to 1 here, because we have to blur it and the existing convolutional
+	-- system rounds values.
+	for y = size.y - 1, 0, -1 do
+		for x = size.x - 1, 0, -1 do
+			local i = y*size.x + x
+			
+			if math.floor((centre - Vector3.new(x, y, 0)):length()) < minsize - border then
+				brush[i] = 100000
+			else
+				brush[i] = 0
+			end
+		end
+	end
+	
+	print("BEFORE_BLUR")
+	print(wea.sculpt.make_preview(brush, size))
+	
+	-- Make the kernel & blur it
+	local success, kernel = wea.conv.kernel_gaussian(kernel_size, 2)
+	if not success then return success, kernel end
+	
+	local success2, msg = worldeditadditions.conv.convolve(
+		brush, Vector3.new(size.x, 0, size.y),
+		kernel, kernel_size_vec
+	)
+	if not success2 then return success2, msg end
+	
+	-- Rescale to be between 0 and 1
+	local max_value = wea.max(brush)
+	for i,value in pairs(brush) do
+		brush[i] = brush[i] / max_value
+	end
+	
+	print("AFTER_BLUR")
+	print(wea.sculpt.make_preview(brush, size))
+	
+	
+	return true, brush, size
+end
diff --git a/worldeditadditions/lib/sculpt/init.lua b/worldeditadditions/lib/sculpt/init.lua
index b1ae6d4..1791d35 100644
--- a/worldeditadditions/lib/sculpt/init.lua
+++ b/worldeditadditions/lib/sculpt/init.lua
@@ -6,7 +6,8 @@ local sculpt = {
 		default = dofile(wea.modpath.."/lib/sculpt/brushes/default.lua"),
 		default_soft = dofile(wea.modpath.."/lib/sculpt/brushes/default_soft.lua"),
 		square = dofile(wea.modpath.."/lib/sculpt/brushes/square.lua"),
-		circle = dofile(wea.modpath.."/lib/sculpt/brushes/circle.lua")
+		circle = dofile(wea.modpath.."/lib/sculpt/brushes/circle.lua"),
+		circle_soft1 = dofile(wea.modpath.."/lib/sculpt/brushes/circle_soft1.lua")
 	},
 	make_brush = dofile(wea.modpath.."/lib/sculpt/make_brush.lua"),
 	make_preview = dofile(wea.modpath.."/lib/sculpt/make_preview.lua"),