====== Python C/C++ bindng ======
간단한 cad를 만들어 보는게 목표
 - glfw, glew을 binding 하여 써보자. 
 - geode 분석
 - cygl 분석 https://github.com/pupil-labs/pyglui

===== Cython helloworld =====

Reference: https://media.readthedocs.org/pdf/cython/latest/cython.pdf

setup.py # build script
<code>
from distutils.core import setup
from Cython.Build import cythonize

setup(
    name = "My hello app",
    ext_modules = cythonize('hello.pyx'),  # accepts a glob pattern
)
</code>

hello.pyx # cython script
<code>
def say_hello_to(name):
	print("Hello %s!" % name)
</code>

hello.pyd 생성하기. mingw32가 설치되고 패스가 걸려 있어야 함. 
<code>
python setup.py build_ext --inplace --compiler=mingw32
</code>

hello.c만 생성하고 싶은 경우
<code>
cython -e hello.pyx
</code>
를 해서 커맨드라인에서 hello.c를 생성할 수 있다. 

----
질문
 - pyx, pyd, pyi 의 역활 구분.


----
===== Cython Compiler =====

win32에서 cythonize할때 사용하는 컴파일러는 mingw32와 ms의 visual c++이 있는데, ms에서 python용으로 vc를 준다.

[[http://www.microsoft.com/en-us/download/confirmation.aspx?id=44266|Microsoft Visual C++ Compiler for Python 2.7]]

----
===== Cython Tutorial =====

# Cython Tutorial 2015-1-1

install

Dockerfile
<code>
FROM debian:sid
MAINTAINER Donghee Park <dongheepark@gmail.com>

RUN apt-get update
CMD echo "updated"
RUN apt-get install vim python openssh-server -y
CMD echo "vim and ssh package installed"
RUN echo "Asia/Seoul" > /etc/timezone && dpkg-reconfigure -f noninteractive tzdata
RUN echo 'root:docker' | chpasswd
RUN /etc/init.d/ssh start
RUN apt-get install build-essential python-pip python-dev -y
RUN pip install cython

CMD ["/bin/bash"] 

# 
</code>

Makefile

<code>
cython helloworld.pyx
gcc -g -O2 -fpic `python-config --cflags` -c helloworld.c -o helloworld.o  
gcc -shared -o helloworld.so helloworld.o `python-config --libs`

</code>

mycode.c

<code>
#include <stdio.h>

int myfunc(int a, int b)
{
	printf("look we are within your c code!! \n");
	return a+b;
}
</code>

mycode.h

<code>
#ifndef __MYCODE_H__
#define __MYCODE_H__
extern int myfunc (int, int);
#endif __MYCODE_H__
</code>

mycodecpy.pyx

<code>
cdef extern from "mycode.h"
	cdef int myfunc (int, int)

def callCfunc ():
	print myfunc (1,2)
</code>

<code>
cython mycodecpy.pyx
gcc -g -O2 -fpic -c mycode.c -o mycode.o
gcc -g -O2 -fpic -c mycodecpy.c -o mycodecpy `python-config --cflags`
gcc -shared -o mycodecpy.so mycode.o mycodecpy.o `python-config --libs` 
</code>

----
===== xdress install =====
llvm 3.4.2 in macos x 10.9

<code>
wget http://llvm.org/releases/3.4.2/clang+llvm-3.4.2-x86_64-apple-darwin10.9.xz
#wget http://llvm.org/releases/3.4.2/clang+llvm-3.4.2-x86_64-linux-gnu-ubuntu-14.04.xz

tar xvfz clang+llvm-3.4.2-x86_64-apple-darwin10.9.xz
mv clang+llvm-3.4.2-x86_64-apple-darwin10.9 llvm-3.4.2-build

export LLVM_CONFIG=llvm-3.4.2-build/bin/llvm-config

git clone git://github.com/xdress/xdress.git

cd xdress

python setup.py build_ext --inplace
sudo python setup.py install
</code>



<code>
xdress --debug -p clang

</code>
----
===== xdress 사용하기 =====

c++ class 'A' python으로 binding 하기


jehsrc/hoover.h
<code>
#if !defined(HOOVER)
#define HOOVER
namespace hoover {
class A {
 public:
   float a;
   double power(int n=1);
};};
#endif
</code>
----

jehsrc/hoover.cpp

<code>
#include "hoover.h"
double hoover::A::power(int n){
  int i = 1;
  double val = a;
  while (i < n){val *= a; i++;};
    return val;
};
</code>


----

jeh_xdressrc.py

<code>
package = 'jedgar'      # top-level python package name
packagedir = 'jedgar'   # location of the python package
builddir = 'jehbuild'

classes = [('A', 'jehsrc/hoover.*')]
</code>

jeh_setup.py
<code>
import os
from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

import numpy as np

cwd = os.getcwd()
incdirs = [cwd, os.path.join(cwd, 'jehsrc'), np.get_include()]

ext_modules = [
    Extension("jedgar.hoover", ['jehsrc/hoover.cpp', "jedgar/hoover.pyx", ],
    	include_dirs=incdirs, language="c++")
    ]

setup(  
  name = 'jedgar',
  cmdclass = {'build_ext': build_ext},
  ext_modules = ext_modules,
  packages = ['jedgar']
)
</code>

Makefile

<code>
all:
        xdress --rc jeh_xdressrc.py
        python jeh_setup.py build > /dev/null 2>&1
clean:
        rm -rf build
        rm -rf jehbuild
        
</code>

----
Hoover Example

<code>
from jedgar.hoover import A

a = A()
a.a = 10
a.power(42)
</code>