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-rw-r--r--docs/gpu.txt16
-rw-r--r--gpu.lua35
2 files changed, 50 insertions, 1 deletions
diff --git a/docs/gpu.txt b/docs/gpu.txt
index 80427ad..a2ea3c7 100644
--- a/docs/gpu.txt
+++ b/docs/gpu.txt
@@ -23,7 +23,7 @@ Parameters:
buffer [integer 0-7]: The slot number to create the new buffer in. If the slot is already occupied, the existing contents will be erased.
xsize [integer 1-64]: The width of the new buffer in pixels.
ysize [integer 1-64]: The height of the new buffer in pixels.
-color [hex color, default "000000"]: A color to fill the new buffer with.
+fill [hex color, default "000000"]: A color to fill the new buffer with.
Command: send
-------------
@@ -133,3 +133,17 @@ x [integer 1-64]: The X position of the left side of the text.
y [integer 1-64]: The Y position of the right side of the text.
color [hex color, default "ff6600"]: The color of the text.
text: The text string to draw.
+
+Command: drawline
+-----------------
+
+Draws a line on a buffer.
+
+Parameters:
+buffer [integer 0-7]: The buffer to draw the line on.
+x1 [integer 1-64]: The X position of the start of the line.
+x2 [integer 1-64]: The X position of the end of the line.
+y1 [integer 1-64]: The Y position of the start of the line.
+y2 [integer 1-64]: The Y position of the end of the line.
+color [hex color, default "000000"]: The nominal color of the line (may not be the color of every pixel, see the "antialias" setting)
+antialias [boolean, default false]: Whether to apply a (very) crude smoothing algorithm to the line to reduce jagged edges at the expense of making the line slightly blurry.
diff --git a/gpu.lua b/gpu.lua
index 9529002..4d0e345 100644
--- a/gpu.lua
+++ b/gpu.lua
@@ -268,6 +268,41 @@ local function runcommand(pos,meta,command)
end
end
meta:set_string("buffer"..bufnum,minetest.serialize(buffer))
+ elseif command.command == "drawline" then
+ if type(command.buffer) ~= "number" or type(command.x1) ~= "number" or type(command.y1) ~= "number" or type(command.x2) ~= "number" or type(command.y2) ~= "number" then return end
+ local bufnum = math.floor(command.buffer)
+ if bufnum < 0 or bufnum > 7 then return end
+ local x1 = math.min(64,math.floor(command.x1))
+ local y1 = math.min(64,math.floor(command.y1))
+ local x2 = math.min(64,math.floor(command.x2))
+ local y2 = math.min(64,math.floor(command.y2))
+ if x1 < 1 or y1 < 1 or x2 < 1 or y2 < 1 then return end
+ local buffer = meta:get_string("buffer"..bufnum)
+ if string.len(buffer) == 0 then return end
+ buffer = minetest.deserialize(buffer)
+ if type(buffer) ~= "table" then return end
+ x2 = math.min(x2,buffer.xsize)
+ y2 = math.min(y2,buffer.ysize)
+ local color = command.color
+ if type(color) ~= "string" or string.len(color) > 7 or string.len(color) < 6 then color = "000000" end
+ if string.sub(color,1,1) == "#" then color = string.sub(color,2,7) end
+ if not tonumber(color,16) then color = "000000" end
+ local p1 = vector.new(x1,y1,0)
+ local p2 = vector.new(x2,y2,0)
+ local length = vector.distance(p1,p2)
+ local dir = vector.direction(p1,p2)
+ if length > 0 then
+ for i=0,length,0.3 do
+ local point = vector.add(p1,vector.multiply(dir,i))
+ point = vector.floor(point)
+ if command.antialias then
+ buffer[point.y][point.x] = blend(buffer[point.y][point.x],color,"average")
+ else
+ buffer[point.y][point.x] = color
+ end
+ end
+ end
+ meta:set_string("buffer"..bufnum,minetest.serialize(buffer))
elseif command.command == "drawpoint" then
if type(command.buffer) ~= "number" or type(command.x) ~= "number" or type(command.y) ~= "number" then return end
local bufnum = math.floor(command.buffer)