Control lua shader by c++

[Roberto14]

Hi all, as title say, i can't figure out how can i take control of some uniforms, inside a file.shader,

but loaded by a .lua file.

 

An example is :

 

in file PostProcess/Bloom/Bloom.shader, ( loaded by PostProcess/bloom.lua )

 

How can i control uniform "cutoff" by c++ side?

 

When i load it

 

int index = pCamera->AddPostEffect( "Shaders/PostProcess/bloom.lua" );

 

i try

 

Leadwerks::Shader *pShader = (Leadwerks::Shader*)pCamera->posteffects[ index ];

 

and pShader is not NULL, but program crash if i use

 

pShader->SetFloat( "cutoff", fMycutoff);

[macklebee]

Try loading the shader in question via C++ and then adjust its uniforms. It should affect all the bloom shaders loaded in the scene.

 

http://www.leadwerks.com/werkspace/topic/14230-global-uniform/#entry97586

[Roberto14]

Try loading the shader in question via C++ and then adjust its uniforms. It should affect all the bloom shaders loaded in the scene.

 

http://www.leadwerks.com/werkspace/topic/14230-global-uniform/#entry97586

 

Well, i already doing that, i'm not?

I say, i'm already using c++, lo "load" it.

 

I load bloom.lua file directly, because is really hard to create a cpp file equivalent.

[macklebee]

Well, i already doing that, i'm not?

I say, i'm already using c++, lo "load" it.

 

I load bloom.lua file directly, because is really hard to create a cpp file equivalent.

 

Well you are loading the lua script via c++ then lua is loading the shader. I am suggesting you load the script as you showed above but also try loading the shader in c++ so you have access to the shader in question.

 

So instead of doing:

int index = pCamera->AddPostEffect( "Shaders/PostProcess/bloom.lua" );
Leadwerks::Shader *pShader = (Leadwerks::Shader*)pCamera->posteffects[ index ];
pShader->SetFloat( "cutoff", fMycutoff); 

try doing (psuedo-code):

int index = pCamera->AddPostEffect( "Shaders/PostProcess/bloom.lua" );
Leadwerks::Shader *pShader = Shader::Load("shaderpath.shader");
pShader->SetFloat( "cutoff", fMycutoff); 

 

--Note that i'm saying "try" since I do not have a way to attempt it - but it has worked for the previous attempt as shown in the link above.

[Roberto14]

Well you are loading the lua script via c++ then lua is loading the shader. I am suggesting you load the script as you showed above but also try loading the shader in c++ so you have access to the shader in question.

 

So instead of doing:

int index = pCamera->AddPostEffect( "Shaders/PostProcess/bloom.lua" );
Leadwerks::Shader *pShader = (Leadwerks::Shader*)pCamera->posteffects[ index ];
pShader->SetFloat( "cutoff", fMycutoff); 

try doing (psuedo-code):

int index = pCamera->AddPostEffect( "Shaders/PostProcess/bloom.lua" );
Leadwerks::Shader *pShader = Shader::Load("shaderpath.shader");
pShader->SetFloat( "cutoff", fMycutoff); 

 

--Note that i'm saying "try" since I do not have a way to attempt it - but it has worked for the previous attempt as shown in the link above.

 

Seems to work, i need more test but i think u solved my problem, really thank you