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HLSL makes position calculations invariant by default to eliminate problems with depth-precision, Apple added a similar qualifier for Metal 2.1 that can and should be used in Vertex & Domain/TessEval shaders for the same effect.

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Mark Satterthwaite 2019-08-14 10:58:37 -04:00 committed by Lukas Hermanns
parent 9ce3158193
commit 0428faada3
1 changed files with 9 additions and 0 deletions
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9
spirv_msl.cpp
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@ -10835,6 +10835,7 @@ string CompilerMSL::builtin_qualifier(BuiltIn builtin)
case BuiltInPointSize:
return "point_size";
case BuiltInPosition:
//<<<<<<< HEAD
if (position_invariant)
{
if (!msl_options.supports_msl_version(2, 1))
@ -10843,6 +10844,14 @@ string CompilerMSL::builtin_qualifier(BuiltIn builtin)
}
else
return "position";
//=======
// /* UE Change Begin: Support invariant position for HLSL source. */
// if (msl_options.supports_msl_version(2, 1) && (execution.model == ExecutionModelVertex || execution.model == ExecutionModelTessellationEvaluation) && ir.source.hlsl == true)
// return "position, invariant";
// else
// return "position";
// /* UE Change End: Support invariant position for HLSL source. */
//>>>>>>> 13dbe357... HLSL makes position calculations invariant by default to eliminate problems with depth-precision, Apple added a similar qualifier for Metal 2.1 that can and should be used in Vertex & Domain/TessEval shaders for the same effect.
case BuiltInLayer:
return "render_target_array_index";
case BuiltInViewportIndex: