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Set the minimum required Metal version #9425

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Set the minimum required Metal version #9425

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ea0759f
Set the minimum required Metal version for compatibility when running…
emezeske Nov 4, 2025
531b8c4
Use MSL 2.0 for mobile and 2.3 for desktop
emezeske Nov 21, 2025
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11 changes: 10 additions & 1 deletion filament/backend/src/metal/MetalShaderCompiler.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -111,9 +111,18 @@ bool isReady() const noexcept {
id<MTLLibrary> library = nil;
switch (program.getShaderLanguage()) {
case ShaderLanguage::MSL: {
// By default, Metal uses the most recent language version.
MTLCompileOptions* options = [MTLCompileOptions new];
options.fastMathEnabled = YES;
// The docs for MTLCompileOptions say that Metal uses the most
// recent language version if it is not specified, but this is
// not always true: it is possible for the environment to be set
// up in a way where an older version is used by default. So we
// explicitly set the minimum version we require.
#if defined(FILAMENT_IOS)
options.languageVersion = MTLLanguageVersion2_0;
#else
options.languageVersion = MTLLanguageVersion2_3;
#endif

assert_invariant(source[source.size() - 1] == '\0');
// the shader string is null terminated and the length includes the null character
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