How to add custom shaders

I am trying to write a custom shader in a mod and I am wondering:

1. If it's actually possible to run more than one shader at a time.
2. How to implement it.

I tried it but there are some problems:

1. It wont find the vert and frag files in the mod folder (it finds them if I put them in Base)
2. It fails to find the shader if there is another one running (I use the hq2x shader, too)

I added the shader in a custom rules script as such:

Code:

void onInit(CRules@ this)
{
    Driver@ driver = getDriver();

    driver.AddShader("myshader", 1.0f);
    driver.SetShader("myshader", true);
    print("init shader");
}

As I found in the KAG.as script.

And these are the shader files:

Vertex:

Code:

void main()
{
  gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
  gl_TexCoord[0] = gl_MultiTexCoord0;
}

Fragment:

Code:

void main()
{
  gl_FragColor.rgb = vec3(1.0, 1.0, 1.0);
  gl_FragColor.a = 1.0;
}

I made them very basic, but I don't know if I need to do anything to conform to the KAG engine.

- Koi

 

Thanks Geti.

 

@Koi_ I know how to do this, see my thread here: https://forum.thd.vg/threads/adding-opengl-shaders-for-cool-graphical-effects.25525/

Here's an example of a more complex shader in the WIP mod Brutality Isle: https://github.com/Normangorman/BrutalityIsle/blob/master/Shaders/brutality.frag
It causes darkness to engulf the player at night

--- Double Post Merged, Dec 16, 2016, Original Post Date: Dec 15, 2016 ---

When I was working on this I wasn't able to find a way to get multiple shaders to work - so I think it's only possible to override the default hq2x shader.

 

When I try loading another shader after hq2x I get this in the console: http://i.imgur.com/KhQRa2n.png
It also happens vice-versa if I load this shader before hq2x.

It says "Shader not found," but the shaders are in Base/Shaders/ so it should be able to find them.
These are different to the error messages that show when the shader files are in the mod folder: http://i.imgur.com/ln41bWD.png

I can make it find them in the mod folder if I use "../../Mods/ModName/shadertest" instead of "shadertest" in the shader init code, but it still has the error shown above.

 

I just did a quick test and found that if I duplicate the hq2x shader, rename it, then try to load it (it's in the base folder), it has the same error.
However, if I simply try to load the original hq2x shader again (after it's already been loaded in KAG.as) it works just fine.

I am using the same code to load the shader as in KAG.as, but it's in a different rules script loaded last in the gamemode.cfg.