ShaderLab command: BlendOp

Specifies the blending operation used by the Blend command. For this command to have any effect, there must also be a Blend command in the same Pass block (if this command is in a Pass block) or SubShader block (if this command is in a SubShader block).

Not all blending operations are supported on all devices, and support depends on both the graphics API and the hardware. Different graphics APIs handle unsupported blending operations differently: GL skips unsupported operations, and Vulkan and Metal fall back to Add operations.

Render pipeline compatibility

Usage

This command makes a change to the render state. Use it in a Pass block to set the render state for that Pass, or use it in a SubShader block to set the render state for all Passes in that SubShader.

Valid parameter values

Notes:

1. Min and Max require GL_EXT_blend_minmax on OpenGL ES 2.
2. Logical operations require DX 11.1+ or Vulkan.
3. Advanced OpenGL blending operations require GLES3.1 AEP+, GL_KHR_blend_equation_advanced, or GL_NV_blend_equation_advanced. They can only be used with standard RGBA blending; they are not compatible with separate RGB and alpha blending.

Examples

Shader "Examples/CommandExample"
{
    SubShader
    {
         // The rest of the code that defines the SubShader goes here.

        Pass
        {    
             // Enable subtractive blending for this Pass
             Blend SrcAlpha One
             BlendOp RevSub
            
              // The rest of the code that defines the Pass goes here.
        }
    }
}

This example code demonstrates the syntax for using this command in a SubShader block.

Shader "Examples/CommandExample"
{
    SubShader
    {
         // Enable subtractive blending for this SubShader
         Blend SrcAlpha One
         BlendOp RevSub

         // The rest of the code that defines the SubShader goes here.        

        Pass
        {    
              // The rest of the code that defines the Pass goes here.
        }
    }
}