diff --git a/modules/shadertools/src/lib/shader-assembly/.assemble-shaders.ts.swp b/modules/shadertools/src/lib/shader-assembly/.assemble-shaders.ts.swp
new file mode 100644
index 0000000000..43be849711
Binary files /dev/null and b/modules/shadertools/src/lib/shader-assembly/.assemble-shaders.ts.swp differ
diff --git a/modules/shadertools/src/lib/shader-assembly/assemble-shaders.ts b/modules/shadertools/src/lib/shader-assembly/assemble-shaders.ts
index 0c8c6f8507..ddad426c97 100644
--- a/modules/shadertools/src/lib/shader-assembly/assemble-shaders.ts
+++ b/modules/shadertools/src/lib/shader-assembly/assemble-shaders.ts
@@ -5,7 +5,7 @@
 import {glsl} from '../glsl-utils/highlight';
 import {resolveModules} from './resolve-modules';
 import {PlatformInfo} from './platform-info';
-import {getPlatformShaderDefines, getVersionDefines} from './platform-defines';
+import {getPlatformShaderDefines} from './platform-defines';
 import {injectShader, DECLARATION_INJECT_MARKER} from './shader-injections';
 import {transpileGLSLShader} from '../shader-transpiler/transpile-glsl-shader';
 import {ShaderModuleInstance} from '../shader-module/shader-module-instance';
@@ -196,7 +196,6 @@ export function assembleWGSLShader(platformInfo: PlatformInfo, options: Assemble
   // ${getShaderNameDefine({id, source, type})}
   // ${getShaderType(type)}
   // ${getPlatformShaderDefines(platformInfo)}
-  // ${getVersionDefines(platformInfo)}
   // ${getApplicationDefines(allDefines)}
   // ${isVertex ? '' : FRAGMENT_SHADER_PROLOGUE}
   // `
@@ -342,7 +341,6 @@ ${sourceVersionDirective}
 ${getShaderNameDefine({id, source, stage})}
 ${`#define SHADER_TYPE_${stage.toUpperCase()}`}
 ${getPlatformShaderDefines(platformInfo)}
-${getVersionDefines(platformInfo)}
 ${stage === 'fragment' ? FRAGMENT_SHADER_PROLOGUE : ''}
 
 // ----- APPLICATION DEFINES -------------------------
diff --git a/modules/shadertools/src/lib/shader-assembly/platform-defines.ts b/modules/shadertools/src/lib/shader-assembly/platform-defines.ts
index 9ef9e2ccf0..9e61e854d4 100644
--- a/modules/shadertools/src/lib/shader-assembly/platform-defines.ts
+++ b/modules/shadertools/src/lib/shader-assembly/platform-defines.ts
@@ -57,63 +57,3 @@ export function getPlatformShaderDefines(platformInfo: PlatformInfo): string {
 `;
   }
 }
-
-/** Adds defines to let shaders portably v1/v3 check for features */
-export function getVersionDefines(platformInfo: PlatformInfo): string {
-  let versionDefines = '';
-
-  if (platformInfo.features.has('webgl2')) {
-    versionDefines += glsl`\
-# define FEATURE_GLSL_DERIVATIVES
-# define FEATURE_GLSL_DRAW_BUFFERS
-# define FEATURE_GLSL_FRAG_DEPTH
-# define FEATURE_GLSL_TEXTURE_LOD
-`;
-  }
-
-  if (!platformInfo.features.has('webgl2')) {
-    if (platformInfo.features.has('glsl-frag-depth')) {
-      versionDefines += glsl`\
-
-// FEATURE_GLSL_FRAG_DEPTH => gl_FragDepth is available
-#ifdef GL_EXT_frag_depth
-# extension GL_EXT_frag_depth : enable
-# define FEATURE_GLSL_FRAG_DEPTH
-# define FRAG_DEPTH
-# define gl_FragDepth gl_FragDepthEXT
-#endif
-`;
-    }
-    if (platformInfo?.features.has('glsl-derivatives')) {
-      versionDefines += glsl`\
-
-// FEATURE_GLSL_DERIVATIVES => dxdF, dxdY and fwidth are available
-#if defined(GL_OES_standard_derivatives) || defined(FEATURE_GLSL_DERIVATIVES)
-# extension GL_OES_standard_derivatives : enable
-# define FEATURE_GLSL_DERIVATIVES
-#endif
-`;
-    }
-    if (platformInfo?.features.has('glsl-frag-data')) {
-      versionDefines += glsl`\
-
-// FEATURE_GLSL_DRAW_BUFFERS => gl_FragData[] is available
-#ifdef GL_EXT_draw_buffers
-# extension GL_EXT_draw_buffers : require
-# define FEATURE_GLSL_DRAW_BUFFERS
-#endif
-`;
-    }
-    if (platformInfo?.features.has('glsl-texture-lod')) {
-      versionDefines += glsl`\
-// TEXTURE_LOD => texture2DLod etc are available
-#ifdef GL_EXT_shader_texture_lod
-# extension GL_EXT_shader_texture_lod : enable
-# define FEATURE_GLSL_TEXTURE_LOD
-# define TEXTURE_LOD
-#endif
-`;
-    }
-  }
-  return versionDefines;
-}
diff --git a/modules/shadertools/src/modules-webgl1/lighting/pbr/pbr-fragment-glsl.ts b/modules/shadertools/src/modules-webgl1/lighting/pbr/pbr-fragment-glsl.ts
index c5ec041fc5..6ef8574f65 100644
--- a/modules/shadertools/src/modules-webgl1/lighting/pbr/pbr-fragment-glsl.ts
+++ b/modules/shadertools/src/modules-webgl1/lighting/pbr/pbr-fragment-glsl.ts
@@ -13,14 +13,6 @@
 import {glsl} from '../../../lib/glsl-utils/highlight';
 
 export const fs = glsl`\
-#if defined(USE_TEX_LOD) && !defined(FEATURE_GLSL_TEXTURE_LOD)
-# error PBR fragment shader: Texture LOD is not available
-#endif
-
-#if !defined(HAS_TANGENTS) && !defined(FEATURE_GLSL_DERIVATIVES)
-# error PBR fragment shader: Derivatives are not available
-#endif
-
 precision highp float;
 
 uniform bool pbr_uUnlit;
diff --git a/modules/shadertools/src/modules/lighting/pbr-material/pbr-fragment-glsl.ts b/modules/shadertools/src/modules/lighting/pbr-material/pbr-fragment-glsl.ts
index 8432eb3f78..89765837a7 100644
--- a/modules/shadertools/src/modules/lighting/pbr-material/pbr-fragment-glsl.ts
+++ b/modules/shadertools/src/modules/lighting/pbr-material/pbr-fragment-glsl.ts
@@ -12,14 +12,6 @@
 import {glsl} from '../../../lib/glsl-utils/highlight';
 
 export const fs = glsl`\
-#if defined(USE_TEX_LOD) && !defined(FEATURE_GLSL_TEXTURE_LOD)
-# error PBR fragment shader: Texture LOD is not available
-#endif
-
-#if !defined(HAS_TANGENTS) && !defined(FEATURE_GLSL_DERIVATIVES)
-# error PBR fragment shader: Derivatives are not available
-#endif
-
 precision highp float;
 
 uniform Projection {