---
title: "BlendFuncConstant | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Type Alias BlendFuncConstant

BlendFuncConstant:  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ZERO"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#zero)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["SRC\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#src_color)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE\_MINUS\_SRC\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one_minus_src_color)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["DST\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#dst_color)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE\_MINUS\_DST\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one_minus_dst_color)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["SRC\_ALPHA"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#src_alpha)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE\_MINUS\_SRC\_ALPHA"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one_minus_src_alpha)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["DST\_ALPHA"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#dst_alpha)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE\_MINUS\_DST\_ALPHA"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one_minus_dst_alpha)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["CONSTANT\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#constant_color)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE\_MINUS\_CONSTANT\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one_minus_constant_color)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["CONSTANT\_ALPHA"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#constant_alpha)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["ONE\_MINUS\_CONSTANT\_ALPHA"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#one_minus_constant_alpha)\]  
    | [WebGLRenderingContextBase](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/)\[["BLEND\_COLOR"](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.WebGLRenderingContextBase/#blend_color)\]