Internal shader uniforms

[Josh]

Here are the values Leadwerks will automatically send to shaders when they are bound:

   	 if (uniform_currenttime) uniform_currenttime->SetFloat(Time::GetCurrent());
       if (uniform_buffersize) uniform_buffersize->SetVec2(Vec2(buffer->GetWidth(),buffer->GetHeight()));
       if (uniform_drawmatrix) uniform_drawmatrix->SetMat4(graphicsdriver->drawmatrix);
       if (uniform_drawcolor) uniform_drawcolor->SetVec4(Leadwerks::GraphicsDriver::GetCurrent()->drawcolor);
       if (uniform_projectionmatrix) uniform_projectionmatrix->SetMat4(graphicsdriver->projectionmatrix);
       if (uniform_isbackbuffer) uniform_isbackbuffer->SetInt(buffer->isbackbuffer);

  	 if (world != NULL)
       {
           if (uniform_ambientlight) uniform_ambientlight->SetVec4(world->ambientlight);
           if (uniform_tessstrength) uniform_tessstrength->SetFloat(world->tessellationstrength);
       }

  	 if (ActiveCamera!=NULL)
       {
           if (uniform_projectioncameramatrix) uniform_projectioncameramatrix->SetMat4(ActiveCamera->projectioncameramatrix);
           if (uniform_cameraposition) uniform_cameraposition->SetVec3(ActiveCamera->GetPosition(true));
           if (uniform_cameradrawmode) uniform_cameradrawmode->SetInt(ActiveCamera->drawmode);
           if (uniform_cameraprojectionmode) uniform_cameraprojectionmode->SetInt(ActiveCamera->projectionmode);
           if (uniform_lighting_ambient) uniform_lighting_ambient->SetVec4(ActiveCamera->world->ambientlight);
           if (uniform_camerarange) uniform_camerarange->SetVec2(ActiveCamera->range);
           if (uniform_camerazoom) uniform_camerazoom->SetFloat(ActiveCamera->zoom);
           if (uniform_cameramatrix) uniform_cameramatrix->SetMat4(ActiveCamera->mat);
           if (uniform_prevprojectioncameramatrix) uniform_prevprojectioncameramatrix->SetMat4(ActiveCamera->prevprojectioncameramatrix);
           if (uniform_camerainversematrix) uniform_camerainversematrix->SetMat4(ActiveCamera->mat.Inverse());
           if (uniform_cameranormalmatrix) uniform_cameranormalmatrix->SetMat3(Mat3(ActiveCamera->mat));
           if (uniform_camerainversenormalmatrix) uniform_camerainversenormalmatrix->SetMat3(Mat3(ActiveCamera->mat.Inverse()));
       }
       else
       {
           if (uniform_projectioncameramatrix) uniform_projectioncameramatrix->SetMat4(graphicsdriver->projectioncameramatrix);
       }

Additionally, texture0-15 are automatically initialized to 0,1,2, etc.

[shadmar]

Thx.

[Rastar]

Great, thanks!

 

And while you're at it :

Could you specify the channel layout of the fragment shader output (frag0, frag1, ...)? I mean, frag0 is the diffuse and frag1 is the normal, but if I read your shaders correctly you are e.g. assigning the alpha from the diffuse to the alpha of the normal vector?

[Admin]

Sure:

 

Channel 0

• r = diffuse.r
  
• g = diffuse.g
  
• b = diffuse.b
  
• a = diffuse.a
  

Channel 1

• r = normal.x
  
• g = normal.y
  
• b = normal.z
  
• a = specularity
  

Channel 2

• r = emissive.r
  
• g = emissive.g
  
• b = emissive.b
  
• a = material flags
  
  • 1: Lighting enabled
    
  • 2: Decals enabled (reserved)
    

[SarperSoher]

How about the input attributes? vertex_position, vertex_color etc?

[Admin]

If you look at the animated model shader, that has everything.

 

And there are also two uniform buffers in use, one for bone matrices for vertex skinning, and the other for instance matrices. The right-hand column of the instance matrices stores the entity color, to make it more compact.

[SarperSoher]

Also I'm seeing some other uniforms in "diffuse normal specular" shader. Like "materialcolorspecular,

lighting_ambient, buffersize etc.

[Admin]

materialcolorspecular and materialcolordiffuse are self-explanatory. The others you listed are all in the code above.

[SarperSoher]

materialcolorspecular and materialcolordiffuse are self-explanatory. The others you listed are all in the code above.

 

Why can't you just add a list of ALL of them with their descriptions to a shader reference self-explanatory or not? You want some great looking shots filling the gallery to promote the engine right? Help the shader developers!

 

I mean most of the API is self-explanatory but they are there in the documents with unnecessary amounts of code examples for both C++ and Lua and a butt load of description. This is lazy, do the Right-Thing-To-Do as Carmack's fond of saying

[Admin]

True. In reality, if I simply added a mechanism for plug and play post-processing effects it would fill up overnight.

[beo6]

yay. got the first thing displaying shader wise. Not quite there yet but at least i see something. was just using the wrong variable names

Still at the beginning to learn though

[Josh]

Built-in uniform values (SEO)

[codeape]

Maybe this topic should be a sticky one.