EXT_shader_texture_lod
WebGL Extension
What is EXT_shader_texture_lod?
The EXT_shader_texture_lod extension is part of the WebGL API and adds texture functions to GLSL shaders providing explicit control of LOD (Level of Detail). Provides texture2DLodEXT, texture2DProjLodEXT, textureCubeLodEXT, and gradient functions for avoiding wrapping artifacts. Available in WebGL1 only; in WebGL2, this functionality is available by default with GLSL #version 300 es.
Read MDN DocumentationBrowser Support
- Graphics card model and capabilities
- GPU driver version
- Browser version and vendor
- Operating system
Usage in Web Scraping & Anti-Bot Bypass
Modern anti-bot systems verify WebGL extensions to detect automated browsers. Mismatches between GPU hardware and available extensions are strong bot signals.
What Anti-Bot Systems Check:
- Extension availability: Does the reported GPU support these extensions?
- Extension combinations: Are the extensions typical for this GPU model?
- Consistency checks: Do reported extensions match other GPU signals?
- Missing extensions: Are expected extensions for this GPU absent?
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