Overhaul how we deal with reserved identifiers.

- Do not silently drop reserved identifiers in the parser. This makes it
  possible to reflect identifiers which are reserved by the
  cross-compiler module.
- Instead of dropping the name, emit _RESERVED_IDENTIFIER_FIXUP in the
  source to make it clear that a name has been rewritten.
- Document what is reserved and not.

1 files changed, 2 insertions, 2 deletions

diff --git a/reference/shaders-ue4/asm/frag/subpass-input.ios.framebuffer-fetch.asm.frag b/reference/shaders-ue4/asm/frag/subpass-input.ios.framebuffer-fetch.asm.frag
index 3dfcf8af..817b1cff 100644
--- a/reference/shaders-ue4/asm/frag/subpass-input.ios.framebuffer-fetch.asm.frag
+++ b/reference/shaders-ue4/asm/frag/subpass-input.ios.framebuffer-fetch.asm.frag
@@ -197,10 +197,10 @@ struct main0_out
     float4 out_var_SV_Target0 [[color(0)]];
 };
 
-fragment main0_out main0(constant type_View& View [[buffer(0)]], constant type_Globals& _Globals [[buffer(1)]], float4 _gl_LastFragData [[color(0)]], texture2d<float> ShadowDepthTexture [[texture(0)]], sampler ShadowDepthTextureSampler [[sampler(0)]], float4 gl_FragCoord [[position]])
+fragment main0_out main0(constant type_View& View [[buffer(0)]], constant type_Globals& _Globals [[buffer(1)]], float4 _RESERVED_IDENTIFIER_FIXUP_gl_LastFragData [[color(0)]], texture2d<float> ShadowDepthTexture [[texture(0)]], sampler ShadowDepthTextureSampler [[sampler(0)]], float4 gl_FragCoord [[position]])
 {
     main0_out out = {};
-    float4 _67 = _gl_LastFragData;
+    float4 _67 = _RESERVED_IDENTIFIER_FIXUP_gl_LastFragData;
     float _68 = _67.w;
     float4 _82 = _Globals.ScreenToShadowMatrix * float4((((gl_FragCoord.xy * View.View_BufferSizeAndInvSize.zw) - View.View_ScreenPositionScaleBias.wz) / View.View_ScreenPositionScaleBias.xy) * float2(_68), _68, 1.0);
     float _118 = fast::clamp(((fast::clamp((ShadowDepthTexture.sample(ShadowDepthTextureSampler, (((_82.xyz / float3(_82.w)).xy * _Globals.ShadowTileOffsetAndSize.zw).xy + _Globals.ShadowTileOffsetAndSize.xy).xy, level(0.0)).xxx * float3(_Globals.SoftTransitionScale.z)) - float3((fast::min(_82.z, 0.999989986419677734375) * _Globals.SoftTransitionScale.z) - 1.0), float3(0.0), float3(1.0)).x - 0.5) * _Globals.ShadowSharpen) + 0.5, 0.0, 1.0);