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Slang Glslang Generated
=======================
This directory holds files that are generated that are needed to build glslang. The github repository that holds slangs current version of glslang is
https://github.com/shader-slang/glslang
Building glslang depends on the submodules
* external/spirv-headers
* external/spirv-tools
The following are not submodules files, and are produces elsewhere and placed in the slang project.
* external/spirv-tools-generated
* external/glslang-generated
Updating glslang
----------------
*On Linux, you can run the [`external/bump-glslang.sh`](../bump-glslang.sh) script.*
*On any platform, you can follow the below instructions:*
To get the latest version of one of the submodules you can use
```
% git pull origin master
```
Make sure you have compatible versions of 'external/spirv-header', 'external/spirv-tools' and 'glslang' before you start!
In the context of Slang we build glslang as a Slang specific shared library/dll. The library is built from a project created by the regular Slang premake. That process is discussed later as there are a bunch of other steps that need to be completed before we can create the Slang glslang project and build it.
First we need to create the `build_info.h` file in glslang. We can do this from the command line via (assuming we are in the Slang root directory).
```
% cd external/glslang
% python build_info.py . -i build_info.h.tmpl -o ../glslang-generated/glslang/build_info.h
```
The glslang project is dependent on 'spirv-tools', so the next step is to set them up. How to do this is described in the README.md file in the `external/spirv-tools-generated` folder.
## Creating and building the Slang glslang project
In normal operation `premake5.lua` does not build glslang because it is a slow process, so it must be specified explicitly on the command line for `premake`.
For Visual Studio
```
% premake vs2015 --build-glslang=true
```
For gcc or clang (add -cc=clang)
```
% premake gmake2 --build-glslang=true
```
Then just build Slang as usual in visual studio, or from the linux command line for example
```
% make config=release_x64
% make config=release_x86
```
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