# A GNU Modula-2 binding of the tigr graphic library

I did this because I needed a graphic library to follow the UI tutorial here :

https://nakst.gitlab.io/tutorial/ui-part-1.html

The tigr library repository is here:

https://github.com/erkkah/tigr/tree/master

I used also the **h2d** utility found in the **XDS** distribution, 
to check my choices when I tralslated the C headers into Modula-2 ones.

## Instructions

To compile the examples, use this command : 

* Compiling tigr.o
  
  gcc -c tigr.c

* Compiling helper.o
  
  gm2 -fiso -c helper.mod

* Compiling an example
  
  gm2 -fiso -I ../../ ../../tigr.o ../../helper.o program.mod -o program -s -lGL -lX11

## microui port

This repository also contains an ISO Modula-2 port of **microui** v2.02
(immediate-mode UI, by rxi) together with a tigr-rendered demo.

* Compiling the microui modules (from `modula2/`)

  gcc -c ../tigr-master/tigr.c -o tigr.o
  gm2 -fiso -c helper.mod
  gm2 -fiso -I. -c microuiHelpers.mod
  gm2 -fiso -I. -c microui.mod

* Building the interactive demo (from `modula2/examples/microui-demo/`)

  gm2 -fiso -I ../../ ../../tigr.o ../../helper.o \
       ../../microuiHelpers.o ../../microui.o \
       microui-demo.mod -o microui-demo -lGL -lX11
  ./microui-demo

* Building the off-screen smoke test (writes `microui-demo.png`)

  gm2 -fiso -I ../../ ../../tigr.o ../../helper.o \
       ../../microuiHelpers.o ../../microui.o \
       microui-headless.mod -o microui-headless -lGL -lX11
  ./microui-headless

`microui-demo` shows windows, headers, tree nodes, buttons, a popup,
checkboxes, sliders, a text box and a log panel; press ESC to quit. See
`ANALYSIS.md` for the GM2-specific adaptations and bugs worked around.