Lua

Love2d font segmentation fault (core dumped)

12 Jul , 2013  

Updated
After debugging and tested on several laptop and OS (OSX, Fedora 18 and Windows 8), the culprit is because Nouveau driver (OpenSouce VGA driver for Nvidia) can’t works with OpenGL perfectly. After installing Nvidia properietary drivers, everything must be works. This is because VGA drivers.

Here is my question in Love2D forum

I change my OS with Ubuntu 13.04 which working perfect with Macbook Pro (installation tutorial)

======================================================================================================

As a newcomer with Love2d, i started using custom font with following the tutorials (http://love2d.org/wiki/love.graphics.newFont)

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-- load ttf file font. set 20px font-size
mainFont = love.graphics.newFont("font.ttf", 20)

function love.draw()
    -- set font before draw text
    love.graphics.setFont(mainFont)
    -- draw text "Hello world!" at left: 100, top: 200
    love.graphics.print("Hello world!", 100, 200)
end

Which this give me segmentation fault (core dumped) results. I have no idea why this happen. Fyi, I’m using Macbook Pro and Fedora 19.

Then i tried this tutorial (https://love2d.org/wiki/Tutorial:Callback_Functions) :

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function love.load()
   image = love.graphics.newImage("cake.jpg")
   local f = love.graphics.newFont(12)
   love.graphics.setFont(f)
   love.graphics.setColor(0,0,0,255)
   love.graphics.setBackgroundColor(255,255,255)
end

It’s also showing the same results. After struggling and searching, i found another way around how to use font :
More…

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Lua

Solve Error: LUBE.lua:30: A Class Commons implementation is required

11 Jul , 2013  

To solve this Lube errors, we need to create a class :

class.lua

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--[[
Copyright (c) 2010-2012 Matthias Richter

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

Except as contained in this notice, the name(s) of the above copyright holders
shall not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
]]--

local function __NULL__() end

-- class "inheritance" by copying functions
local function inherit(class, interface, ...)
    if not interface then return end
    assert(type(interface) == "table", "Can only inherit from other classes.")

    -- __index and construct are not overwritten as for them class[name] is defined
    for name, func in pairs(interface) do
        if not class[name] then
            class[name] = func
        end
    end
    for super in pairs(interface.__is_a or {}) do
        class.__is_a[super] = true
    end

    return inherit(class, ...)
end

-- class builder
local function new(args)
    local super = {}
    local name = '<unnamed class>'
    local constructor = args or __NULL__
    if type(args) == "table" then
        -- nasty hack to check if args.inherits is a table of classes or a class or nil
        super = (args.inherits or {}).__is_a and {args.inherits} or args.inherits or {}
        name = args.name or name
        constructor = args[1] or __NULL__
    end
    assert(type(constructor) == "function", 'constructor has to be nil or a function')

    -- build class
    local class = {}
    class.__index = class
    class.__tostring = function() return ("<instance of %s>"):format(tostring(class)) end
    class.construct = constructor or __NULL__
    class.inherit = inherit
    class.__is_a = {[class] = true}
    class.is_a = function(self, other) return not not self.__is_a[other] end

    -- inherit superclasses (see above)
    inherit(class, unpack(super))

    -- syntactic sugar
    local meta = {
        __call = function(self, ...)
            local obj = {}
            setmetatable(obj, self)
            self.construct(obj, ...)
            return obj
        end,
        __tostring = function() return name end
    }
    return setmetatable(class, meta)
end

-- interface for cross class-system compatibility (see https://github.com/bartbes/Class-Commons).
if class_commons ~= false and not common then
    common = {}
    function common.class(name, prototype, parent)
        local init = prototype.init or (parent or {}).init
        return new{name = name, inherits = {prototype, parent}, init}
    end
    function common.instance(class, ...)
        return class(...)
    end
end


-- the module
return setmetatable({new = new, inherit = inherit},
    {__call = function(_,...) return new(...) end})

Then in we can load this class before calling LUBE. For instance, i put those two files (class.lua and Lube.lua) into folder called “libs”.

main.lua

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Class = require "libs.class"
require "libs.LUBE"

It’s should solve the problem!

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Lua

Game Development With Love2D Introduction

11 Jul , 2013  

I’m trying to compare pyglet (Python based game engine) with Love2D (Lua based) for Game Development.
I use Fedora 19 at this examples.

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sudo yum install lua love

sudo yum install SDL SDL-devel gsl gsl-devel libtheora libtheora-devel libtiff libtiff-devel libpng libpng-devel imlib2 imlib2-devel bzip2-devel ImageMagick ImageMagick-devel libxml2 libxml2-devel libjpeg libjpeg-devel libdv libdv-devel libavc1394 libavc1394-devel libmpeg3-devel ftgl-devel freetype freetype-devel ImageMagick-c++ ImageMagick-c++-devel libXv libXv-devel lcms lcms-devel mesa-libGL mesa-libGL-devel mesa-libGLU mesa-libGLU-devel jasper jasper-devel ffmpeg ffmpeg-devel freeglut-devel opencv-devel libquicktime libquicktime-devel faad2 faac ffmpeg-libs a52dec a52dec-devel libv4l libv4l-devel
sudo  yum install libogg libogg-devel libvorbis libvorbis-devel fftw3 fftw3-devel speex speex-devel flac flac-devel ladspa ladspa-devel libsndfile libsndfile-devel lame lame-devel

sudo yum install freetype-devel glibc-devel libmpg123-devel libmodplug-devel physfs-devel mesa-libGL-devel openal-soft-devel DevIL-devel libvorbis-devel libmng-devel libtiff-devel lua-devel gcc-c++ libtool
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zip -9 -q -r Pong.love . && love Pong.love

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