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Add "drawline" command to GPU

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This commit is contained in:
cheapie 2021-02-26 22:58:58 -06:00
parent e421f0a5c0
commit 7446451b1b
2 changed files with 50 additions and 1 deletions
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16
docs/gpu.txt
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@ -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.

35
gpu.lua
View File

@ -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)