Require GL_EXT_samplerless_texture_functions only if needed (#5527)

* Require GL_EXT_samplerless_texture_functions only if needed

This extension is only necessary when using texture functions
on non-combined texture/samplers.

Fixes #5518

1 files changed, 2 insertions, 1 deletions

diff --git a/source/slang/slang-core-module-textures.cpp b/source/slang/slang-core-module-textures.cpp
index 0d20cc1dd..e0b8d2b27 100644
--- a/source/slang/slang-core-module-textures.cpp
+++ b/source/slang/slang-core-module-textures.cpp
@@ -374,6 +374,8 @@ void TextureTypeInfo::writeGetDimensionFunctions()
                         glsl << ", ($" << aa++ << " = textureQueryLevels($0))";
                     }
                 };
+                glsl << "if (isCombined == 0) { "
+                        "__requireGLSLExtension(\"GL_EXT_samplerless_texture_functions\"); }\n";
                 glsl << "if (access == " << kCoreModule_ResourceAccessReadOnly
                      << ") __intrinsic_asm \"";
                 emitIntrinsic(toSlice("textureSize"), !isMultisample);
@@ -491,7 +493,6 @@ void TextureTypeInfo::writeGetDimensionFunctions()
             }
 
             sb << "    __glsl_version(450)\n";
-            sb << "    __glsl_extension(GL_EXT_samplerless_texture_functions)\n";
 
             sb << "    [require(cpp";
             if (glsl.getLength())