From b04c7b63435ad51ce747d678be3fe5899f14609e Mon Sep 17 00:00:00 2001
From: vonchenplus <vonchenplus@gmail.com>
Date: Tue, 26 Oct 2021 23:01:57 +0800
Subject: [PATCH 1/5] Support gl_BackColor attribute

---
 .../backend/spirv/emit_context.cpp               | 16 ++++++++++++++++
 .../backend/spirv/emit_context.h                 |  2 ++
 .../backend/spirv/emit_spirv_context_get_set.cpp | 15 +++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index 2885e6799c..9d84c4fc62 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -1286,6 +1286,14 @@ void EmitContext::DefineInputs(const IR::Program& program) {
         Decorate(id, spv::Decoration::Location, location);
         input_front_color = id;
     }
+    if (loads.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
+        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
+        previous_unused_location = location;
+        used_locations.set(location);
+        const Id id{DefineInput(*this, F32[4], true)};
+        Decorate(id, spv::Decoration::Location, location);
+        input_back_color = id;
+    }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (loads.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
             const size_t location =
@@ -1363,6 +1371,14 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
         Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
         output_front_color = id;
     }
+    if (info.stores.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
+        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
+        previous_unused_location = location;
+        used_locations.set(location);
+        const Id id{DefineOutput(*this, F32[4], invocations)};
+        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        output_back_color = id;
+    }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (info.stores.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
             const size_t location =
diff --git a/src/shader_recompiler/backend/spirv/emit_context.h b/src/shader_recompiler/backend/spirv/emit_context.h
index 847d0c0e64..d2bc0a952f 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.h
+++ b/src/shader_recompiler/backend/spirv/emit_context.h
@@ -269,12 +269,14 @@ public:
 
     Id input_position{};
     Id input_front_color{};
+    Id input_back_color{};
     std::array<Id, 10> input_fixed_fnc_textures{};
     std::array<Id, 32> input_generics{};
 
     Id output_point_size{};
     Id output_position{};
     Id output_front_color{};
+    Id output_back_color{};
     std::array<Id, 10> output_fixed_fnc_textures{};
     std::array<std::array<GenericElementInfo, 4>, 32> output_generics{};
 
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index 6f60c65747..899df62941 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -119,6 +119,14 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
         const Id element_id{ctx.Const(element)};
         return OutputAccessChain(ctx, ctx.output_f32, ctx.output_front_color, element_id);
     }
+    case IR::Attribute::ColorBackDiffuseR:
+    case IR::Attribute::ColorBackDiffuseG:
+    case IR::Attribute::ColorBackDiffuseB:
+    case IR::Attribute::ColorBackDiffuseA: {
+        const u32 element{static_cast<u32>(attr) % 4};
+        const Id element_id{ctx.Const(element)};
+        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_back_color, element_id);
+    }
     case IR::Attribute::ClipDistance0:
     case IR::Attribute::ClipDistance1:
     case IR::Attribute::ClipDistance2:
@@ -363,6 +371,13 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
         return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_color,
                                                   ctx.Const(element)));
     }
+    case IR::Attribute::ColorBackDiffuseR:
+    case IR::Attribute::ColorBackDiffuseG:
+    case IR::Attribute::ColorBackDiffuseB:
+    case IR::Attribute::ColorBackDiffuseA: {
+        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_color,
+                                                  ctx.Const(element)));
+    }
     case IR::Attribute::InstanceId:
         if (ctx.profile.support_vertex_instance_id) {
             return ctx.OpBitcast(ctx.F32[1], ctx.OpLoad(ctx.U32[1], ctx.instance_id));

From 92bebecf4632fb5435d74a77d45bf56535eb85e4 Mon Sep 17 00:00:00 2001
From: vonchenplus <vonchenplus@gmail.com>
Date: Tue, 26 Oct 2021 23:09:44 +0800
Subject: [PATCH 2/5] Support gl_FrontSecondaryColor attribute

---
 .../backend/spirv/emit_context.cpp               | 16 ++++++++++++++++
 .../backend/spirv/emit_context.h                 |  2 ++
 .../backend/spirv/emit_spirv_context_get_set.cpp | 15 +++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index 9d84c4fc62..7726bc9c6d 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -1286,6 +1286,14 @@ void EmitContext::DefineInputs(const IR::Program& program) {
         Decorate(id, spv::Decoration::Location, location);
         input_front_color = id;
     }
+    if (loads.AnyComponent(IR::Attribute::ColorFrontSpecularR)) {
+        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
+        previous_unused_location = location;
+        used_locations.set(location);
+        const Id id{DefineInput(*this, F32[4], true)};
+        Decorate(id, spv::Decoration::Location, location);
+        input_front_secondary_color = id;
+    }
     if (loads.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
         const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
         previous_unused_location = location;
@@ -1371,6 +1379,14 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
         Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
         output_front_color = id;
     }
+    if (info.stores.AnyComponent(IR::Attribute::ColorFrontSpecularR)) {
+        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
+        previous_unused_location = location;
+        used_locations.set(location);
+        const Id id{DefineOutput(*this, F32[4], invocations)};
+        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        output_front_secondary_color = id;
+    }
     if (info.stores.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
         const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
         previous_unused_location = location;
diff --git a/src/shader_recompiler/backend/spirv/emit_context.h b/src/shader_recompiler/backend/spirv/emit_context.h
index d2bc0a952f..8818269a55 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.h
+++ b/src/shader_recompiler/backend/spirv/emit_context.h
@@ -269,6 +269,7 @@ public:
 
     Id input_position{};
     Id input_front_color{};
+    Id input_front_secondary_color{};
     Id input_back_color{};
     std::array<Id, 10> input_fixed_fnc_textures{};
     std::array<Id, 32> input_generics{};
@@ -276,6 +277,7 @@ public:
     Id output_point_size{};
     Id output_position{};
     Id output_front_color{};
+    Id output_front_secondary_color{};
     Id output_back_color{};
     std::array<Id, 10> output_fixed_fnc_textures{};
     std::array<std::array<GenericElementInfo, 4>, 32> output_generics{};
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index 899df62941..2da76493a7 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -119,6 +119,14 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
         const Id element_id{ctx.Const(element)};
         return OutputAccessChain(ctx, ctx.output_f32, ctx.output_front_color, element_id);
     }
+    case IR::Attribute::ColorFrontSpecularR:
+    case IR::Attribute::ColorFrontSpecularG:
+    case IR::Attribute::ColorFrontSpecularB:
+    case IR::Attribute::ColorFrontSpecularA: {
+        const u32 element{static_cast<u32>(attr) % 4};
+        const Id element_id{ctx.Const(element)};
+        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_front_secondary_color, element_id);
+    }
     case IR::Attribute::ColorBackDiffuseR:
     case IR::Attribute::ColorBackDiffuseG:
     case IR::Attribute::ColorBackDiffuseB:
@@ -371,6 +379,13 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
         return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_color,
                                                   ctx.Const(element)));
     }
+    case IR::Attribute::ColorFrontSpecularR:
+    case IR::Attribute::ColorFrontSpecularG:
+    case IR::Attribute::ColorFrontSpecularB:
+    case IR::Attribute::ColorFrontSpecularA: {
+        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_secondary_color,
+                                                  ctx.Const(element)));
+    }
     case IR::Attribute::ColorBackDiffuseR:
     case IR::Attribute::ColorBackDiffuseG:
     case IR::Attribute::ColorBackDiffuseB:

From 36c21ff6cbffd55ba9314314ee8f414181fd4f9b Mon Sep 17 00:00:00 2001
From: vonchenplus <vonchenplus@gmail.com>
Date: Tue, 26 Oct 2021 23:14:40 +0800
Subject: [PATCH 3/5] Support gl_BackSecondaryColor attribute

---
 .../backend/spirv/emit_context.cpp               | 16 ++++++++++++++++
 .../backend/spirv/emit_context.h                 |  2 ++
 .../backend/spirv/emit_spirv_context_get_set.cpp | 15 +++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index 7726bc9c6d..d60ad139d5 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -1302,6 +1302,14 @@ void EmitContext::DefineInputs(const IR::Program& program) {
         Decorate(id, spv::Decoration::Location, location);
         input_back_color = id;
     }
+    if (loads.AnyComponent(IR::Attribute::ColorBackSpecularR)) {
+        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
+        previous_unused_location = location;
+        used_locations.set(location);
+        const Id id{DefineInput(*this, F32[4], true)};
+        Decorate(id, spv::Decoration::Location, location);
+        input_back_secondary_color = id;
+    }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (loads.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
             const size_t location =
@@ -1395,6 +1403,14 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
         Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
         output_back_color = id;
     }
+    if (info.stores.AnyComponent(IR::Attribute::ColorBackSpecularR)) {
+        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
+        previous_unused_location = location;
+        used_locations.set(location);
+        const Id id{DefineOutput(*this, F32[4], invocations)};
+        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        output_back_secondary_color = id;
+    }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (info.stores.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
             const size_t location =
diff --git a/src/shader_recompiler/backend/spirv/emit_context.h b/src/shader_recompiler/backend/spirv/emit_context.h
index 8818269a55..a08622099a 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.h
+++ b/src/shader_recompiler/backend/spirv/emit_context.h
@@ -271,6 +271,7 @@ public:
     Id input_front_color{};
     Id input_front_secondary_color{};
     Id input_back_color{};
+    Id input_back_secondary_color{};
     std::array<Id, 10> input_fixed_fnc_textures{};
     std::array<Id, 32> input_generics{};
 
@@ -279,6 +280,7 @@ public:
     Id output_front_color{};
     Id output_front_secondary_color{};
     Id output_back_color{};
+    Id output_back_secondary_color{};
     std::array<Id, 10> output_fixed_fnc_textures{};
     std::array<std::array<GenericElementInfo, 4>, 32> output_generics{};
 
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index 2da76493a7..2d1545851b 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -135,6 +135,14 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
         const Id element_id{ctx.Const(element)};
         return OutputAccessChain(ctx, ctx.output_f32, ctx.output_back_color, element_id);
     }
+    case IR::Attribute::ColorBackSpecularR:
+    case IR::Attribute::ColorBackSpecularG:
+    case IR::Attribute::ColorBackSpecularB:
+    case IR::Attribute::ColorBackSpecularA: {
+        const u32 element{static_cast<u32>(attr) % 4};
+        const Id element_id{ctx.Const(element)};
+        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_back_secondary_color, element_id);
+    }
     case IR::Attribute::ClipDistance0:
     case IR::Attribute::ClipDistance1:
     case IR::Attribute::ClipDistance2:
@@ -393,6 +401,13 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
         return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_color,
                                                   ctx.Const(element)));
     }
+    case IR::Attribute::ColorBackSpecularR:
+    case IR::Attribute::ColorBackSpecularG:
+    case IR::Attribute::ColorBackSpecularB:
+    case IR::Attribute::ColorBackSpecularA: {
+        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_secondary_color,
+                                                  ctx.Const(element)));
+    }
     case IR::Attribute::InstanceId:
         if (ctx.profile.support_vertex_instance_id) {
             return ctx.OpBitcast(ctx.F32[1], ctx.OpLoad(ctx.U32[1], ctx.instance_id));

From 49f9a442356d582d31832e79098fd6db22f0f4c3 Mon Sep 17 00:00:00 2001
From: vonchenplus <vonchenplus@gmail.com>
Date: Sun, 31 Oct 2021 22:02:05 +0800
Subject: [PATCH 4/5] Support gl_FogFragCoord attribute

---
 .../backend/spirv/emit_context.cpp            | 85 +++++++++----------
 .../backend/spirv/emit_context.h              |  2 +
 .../spirv/emit_spirv_context_get_set.cpp      | 19 ++++-
 3 files changed, 58 insertions(+), 48 deletions(-)

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index d60ad139d5..386c14ce51 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -430,10 +430,12 @@ Id DescType(EmitContext& ctx, Id sampled_type, Id pointer_type, u32 count) {
     }
 }
 
-size_t FindNextUnusedLocation(const std::bitset<IR::NUM_GENERICS>& used_locations,
-                              size_t start_offset) {
+size_t FindAndSetNextUnusedLocation(std::bitset<IR::NUM_GENERICS>& used_locations,
+                                    size_t& start_offset) {
     for (size_t location = start_offset; location < used_locations.size(); ++location) {
         if (!used_locations.test(location)) {
+            start_offset = location;
+            used_locations.set(location);
             return location;
         }
     }
@@ -1279,45 +1281,40 @@ void EmitContext::DefineInputs(const IR::Program& program) {
     }
     size_t previous_unused_location = 0;
     if (loads.AnyComponent(IR::Attribute::ColorFrontDiffuseR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location, location);
+        Decorate(id, spv::Decoration::Location,
+                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
         input_front_color = id;
     }
     if (loads.AnyComponent(IR::Attribute::ColorFrontSpecularR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location, location);
+        Decorate(id, spv::Decoration::Location,
+                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
         input_front_secondary_color = id;
     }
     if (loads.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location, location);
+        Decorate(id, spv::Decoration::Location,
+                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
         input_back_color = id;
     }
     if (loads.AnyComponent(IR::Attribute::ColorBackSpecularR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location, location);
+        Decorate(id, spv::Decoration::Location,
+                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
         input_back_secondary_color = id;
     }
+    if (loads.AnyComponent(IR::Attribute::FogCoordinate)) {
+        const Id id{DefineInput(*this, F32[4], true)};
+        Decorate(id, spv::Decoration::Location,
+                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
+        input_fog_frag_coord = id;
+    }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (loads.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
-            const size_t location =
-                FindNextUnusedLocation(used_locations, previous_unused_location);
-            previous_unused_location = location;
-            used_locations.set(location);
             const Id id{DefineInput(*this, F32[4], true)};
-            Decorate(id, spv::Decoration::Location, location);
+            Decorate(id, spv::Decoration::Location,
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
             input_fixed_fnc_textures[index] = id;
         }
     }
@@ -1380,45 +1377,45 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
     }
     size_t previous_unused_location = 0;
     if (info.stores.AnyComponent(IR::Attribute::ColorFrontDiffuseR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        Decorate(id, spv::Decoration::Location,
+                 static_cast<u32>(
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
         output_front_color = id;
     }
     if (info.stores.AnyComponent(IR::Attribute::ColorFrontSpecularR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        Decorate(id, spv::Decoration::Location,
+                 static_cast<u32>(
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
         output_front_secondary_color = id;
     }
     if (info.stores.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        Decorate(id, spv::Decoration::Location,
+                 static_cast<u32>(
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
         output_back_color = id;
     }
     if (info.stores.AnyComponent(IR::Attribute::ColorBackSpecularR)) {
-        const size_t location = FindNextUnusedLocation(used_locations, previous_unused_location);
-        previous_unused_location = location;
-        used_locations.set(location);
         const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location, static_cast<u32>(location));
+        Decorate(id, spv::Decoration::Location,
+                 static_cast<u32>(
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
         output_back_secondary_color = id;
     }
+    if (info.stores.AnyComponent(IR::Attribute::FogCoordinate)) {
+        const Id id{DefineOutput(*this, F32[4], invocations)};
+        Decorate(id, spv::Decoration::Location,
+                 static_cast<u32>(
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
+        output_fog_frag_coord = id;
+    }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (info.stores.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
-            const size_t location =
-                FindNextUnusedLocation(used_locations, previous_unused_location);
-            previous_unused_location = location;
-            used_locations.set(location);
             const Id id{DefineOutput(*this, F32[4], invocations)};
-            Decorate(id, spv::Decoration::Location, location);
+            Decorate(id, spv::Decoration::Location,
+                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
             output_fixed_fnc_textures[index] = id;
         }
     }
diff --git a/src/shader_recompiler/backend/spirv/emit_context.h b/src/shader_recompiler/backend/spirv/emit_context.h
index a08622099a..e1af12a38a 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.h
+++ b/src/shader_recompiler/backend/spirv/emit_context.h
@@ -272,6 +272,7 @@ public:
     Id input_front_secondary_color{};
     Id input_back_color{};
     Id input_back_secondary_color{};
+    Id input_fog_frag_coord{};
     std::array<Id, 10> input_fixed_fnc_textures{};
     std::array<Id, 32> input_generics{};
 
@@ -281,6 +282,7 @@ public:
     Id output_front_secondary_color{};
     Id output_back_color{};
     Id output_back_secondary_color{};
+    Id output_fog_frag_coord{};
     std::array<Id, 10> output_fixed_fnc_textures{};
     std::array<std::array<GenericElementInfo, 4>, 32> output_generics{};
 
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index 2d1545851b..6fa99cc1a5 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -143,6 +143,11 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
         const Id element_id{ctx.Const(element)};
         return OutputAccessChain(ctx, ctx.output_f32, ctx.output_back_secondary_color, element_id);
     }
+    case IR::Attribute::FogCoordinate: {
+        const u32 element{static_cast<u32>(attr) % 4};
+        const Id element_id{ctx.Const(element)};
+        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_fog_frag_coord, element_id);
+    }
     case IR::Attribute::ClipDistance0:
     case IR::Attribute::ClipDistance1:
     case IR::Attribute::ClipDistance2:
@@ -391,8 +396,9 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
     case IR::Attribute::ColorFrontSpecularG:
     case IR::Attribute::ColorFrontSpecularB:
     case IR::Attribute::ColorFrontSpecularA: {
-        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_secondary_color,
-                                                  ctx.Const(element)));
+        return ctx.OpLoad(ctx.F32[1],
+                          AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_secondary_color,
+                                      ctx.Const(element)));
     }
     case IR::Attribute::ColorBackDiffuseR:
     case IR::Attribute::ColorBackDiffuseG:
@@ -405,8 +411,13 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
     case IR::Attribute::ColorBackSpecularG:
     case IR::Attribute::ColorBackSpecularB:
     case IR::Attribute::ColorBackSpecularA: {
-        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_secondary_color,
-                                                  ctx.Const(element)));
+        return ctx.OpLoad(ctx.F32[1],
+                          AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_secondary_color,
+                                      ctx.Const(element)));
+    }
+    case IR::Attribute::FogCoordinate: {
+        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex,
+                                                  ctx.input_fog_frag_coord, ctx.Const(element)));
     }
     case IR::Attribute::InstanceId:
         if (ctx.profile.support_vertex_instance_id) {

From f2a420424546fbc031594c5927b553b9d928b3a4 Mon Sep 17 00:00:00 2001
From: Feng Chen <vonchenplus@gmail.com>
Date: Mon, 1 Nov 2021 12:00:13 +0800
Subject: [PATCH 5/5] Simply legacy attribute implement

---
 .../backend/spirv/emit_context.cpp            | 148 +++++++++++-------
 .../backend/spirv/emit_context.h              |   3 +
 .../spirv/emit_spirv_context_get_set.cpp      | 126 ++++-----------
 3 files changed, 125 insertions(+), 152 deletions(-)

diff --git a/src/shader_recompiler/backend/spirv/emit_context.cpp b/src/shader_recompiler/backend/spirv/emit_context.cpp
index 386c14ce51..3c84e64666 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_context.cpp
@@ -441,6 +441,22 @@ size_t FindAndSetNextUnusedLocation(std::bitset<IR::NUM_GENERICS>& used_location
     }
     throw RuntimeError("Unable to get an unused location for legacy attribute");
 }
+
+Id DefineLegacyInput(EmitContext& ctx, std::bitset<IR::NUM_GENERICS>& used_locations,
+                     size_t& start_offset) {
+    const Id id{DefineInput(ctx, ctx.F32[4], true)};
+    const size_t location = FindAndSetNextUnusedLocation(used_locations, start_offset);
+    ctx.Decorate(id, spv::Decoration::Location, location);
+    return id;
+}
+
+Id DefineLegacyOutput(EmitContext& ctx, std::bitset<IR::NUM_GENERICS>& used_locations,
+                      size_t& start_offset, std::optional<u32> invocations) {
+    const Id id{DefineOutput(ctx, ctx.F32[4], invocations)};
+    const size_t location = FindAndSetNextUnusedLocation(used_locations, start_offset);
+    ctx.Decorate(id, spv::Decoration::Location, location);
+    return id;
+}
 } // Anonymous namespace
 
 void VectorTypes::Define(Sirit::Module& sirit_ctx, Id base_type, std::string_view name) {
@@ -522,6 +538,64 @@ Id EmitContext::BitOffset16(const IR::Value& offset) {
     return OpBitwiseAnd(U32[1], OpShiftLeftLogical(U32[1], Def(offset), Const(3u)), Const(16u));
 }
 
+Id EmitContext::InputLegacyAttribute(IR::Attribute attribute) {
+    if (attribute >= IR::Attribute::ColorFrontDiffuseR &&
+        attribute <= IR::Attribute::ColorFrontDiffuseA) {
+        return input_front_color;
+    }
+    if (attribute >= IR::Attribute::ColorFrontSpecularR &&
+        attribute <= IR::Attribute::ColorFrontSpecularA) {
+        return input_front_secondary_color;
+    }
+    if (attribute >= IR::Attribute::ColorBackDiffuseR &&
+        attribute <= IR::Attribute::ColorBackDiffuseA) {
+        return input_back_color;
+    }
+    if (attribute >= IR::Attribute::ColorBackSpecularR &&
+        attribute <= IR::Attribute::ColorBackSpecularA) {
+        return input_back_secondary_color;
+    }
+    if (attribute == IR::Attribute::FogCoordinate) {
+        return input_fog_frag_coord;
+    }
+    if (attribute >= IR::Attribute::FixedFncTexture0S &&
+        attribute <= IR::Attribute::FixedFncTexture9Q) {
+        u32 index =
+            (static_cast<u32>(attribute) - static_cast<u32>(IR::Attribute::FixedFncTexture0S)) / 4;
+        return input_fixed_fnc_textures[index];
+    }
+    throw InvalidArgument("Attribute is not legacy attribute {}", attribute);
+}
+
+Id EmitContext::OutputLegacyAttribute(IR::Attribute attribute) {
+    if (attribute >= IR::Attribute::ColorFrontDiffuseR &&
+        attribute <= IR::Attribute::ColorFrontDiffuseA) {
+        return output_front_color;
+    }
+    if (attribute >= IR::Attribute::ColorFrontSpecularR &&
+        attribute <= IR::Attribute::ColorFrontSpecularA) {
+        return output_front_secondary_color;
+    }
+    if (attribute >= IR::Attribute::ColorBackDiffuseR &&
+        attribute <= IR::Attribute::ColorBackDiffuseA) {
+        return output_back_color;
+    }
+    if (attribute >= IR::Attribute::ColorBackSpecularR &&
+        attribute <= IR::Attribute::ColorBackSpecularA) {
+        return output_back_secondary_color;
+    }
+    if (attribute == IR::Attribute::FogCoordinate) {
+        return output_fog_frag_coord;
+    }
+    if (attribute >= IR::Attribute::FixedFncTexture0S &&
+        attribute <= IR::Attribute::FixedFncTexture9Q) {
+        u32 index =
+            (static_cast<u32>(attribute) - static_cast<u32>(IR::Attribute::FixedFncTexture0S)) / 4;
+        return output_fixed_fnc_textures[index];
+    }
+    throw InvalidArgument("Attribute is not legacy attribute {}", attribute);
+}
+
 void EmitContext::DefineCommonTypes(const Info& info) {
     void_id = TypeVoid();
 
@@ -1281,41 +1355,26 @@ void EmitContext::DefineInputs(const IR::Program& program) {
     }
     size_t previous_unused_location = 0;
     if (loads.AnyComponent(IR::Attribute::ColorFrontDiffuseR)) {
-        const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location,
-                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-        input_front_color = id;
+        input_front_color = DefineLegacyInput(*this, used_locations, previous_unused_location);
     }
     if (loads.AnyComponent(IR::Attribute::ColorFrontSpecularR)) {
-        const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location,
-                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-        input_front_secondary_color = id;
+        input_front_secondary_color =
+            DefineLegacyInput(*this, used_locations, previous_unused_location);
     }
     if (loads.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
-        const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location,
-                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-        input_back_color = id;
+        input_back_color = DefineLegacyInput(*this, used_locations, previous_unused_location);
     }
     if (loads.AnyComponent(IR::Attribute::ColorBackSpecularR)) {
-        const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location,
-                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-        input_back_secondary_color = id;
+        input_back_secondary_color =
+            DefineLegacyInput(*this, used_locations, previous_unused_location);
     }
     if (loads.AnyComponent(IR::Attribute::FogCoordinate)) {
-        const Id id{DefineInput(*this, F32[4], true)};
-        Decorate(id, spv::Decoration::Location,
-                 FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-        input_fog_frag_coord = id;
+        input_fog_frag_coord = DefineLegacyInput(*this, used_locations, previous_unused_location);
     }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (loads.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
-            const Id id{DefineInput(*this, F32[4], true)};
-            Decorate(id, spv::Decoration::Location,
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-            input_fixed_fnc_textures[index] = id;
+            input_fixed_fnc_textures[index] =
+                DefineLegacyInput(*this, used_locations, previous_unused_location);
         }
     }
     if (stage == Stage::TessellationEval) {
@@ -1377,46 +1436,29 @@ void EmitContext::DefineOutputs(const IR::Program& program) {
     }
     size_t previous_unused_location = 0;
     if (info.stores.AnyComponent(IR::Attribute::ColorFrontDiffuseR)) {
-        const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location,
-                 static_cast<u32>(
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
-        output_front_color = id;
+        output_front_color =
+            DefineLegacyOutput(*this, used_locations, previous_unused_location, invocations);
     }
     if (info.stores.AnyComponent(IR::Attribute::ColorFrontSpecularR)) {
-        const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location,
-                 static_cast<u32>(
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
-        output_front_secondary_color = id;
+        output_front_secondary_color =
+            DefineLegacyOutput(*this, used_locations, previous_unused_location, invocations);
     }
     if (info.stores.AnyComponent(IR::Attribute::ColorBackDiffuseR)) {
-        const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location,
-                 static_cast<u32>(
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
-        output_back_color = id;
+        output_back_color =
+            DefineLegacyOutput(*this, used_locations, previous_unused_location, invocations);
     }
     if (info.stores.AnyComponent(IR::Attribute::ColorBackSpecularR)) {
-        const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location,
-                 static_cast<u32>(
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
-        output_back_secondary_color = id;
+        output_back_secondary_color =
+            DefineLegacyOutput(*this, used_locations, previous_unused_location, invocations);
     }
     if (info.stores.AnyComponent(IR::Attribute::FogCoordinate)) {
-        const Id id{DefineOutput(*this, F32[4], invocations)};
-        Decorate(id, spv::Decoration::Location,
-                 static_cast<u32>(
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location)));
-        output_fog_frag_coord = id;
+        output_fog_frag_coord =
+            DefineLegacyOutput(*this, used_locations, previous_unused_location, invocations);
     }
     for (size_t index = 0; index < NUM_FIXEDFNCTEXTURE; ++index) {
         if (info.stores.AnyComponent(IR::Attribute::FixedFncTexture0S + index * 4)) {
-            const Id id{DefineOutput(*this, F32[4], invocations)};
-            Decorate(id, spv::Decoration::Location,
-                     FindAndSetNextUnusedLocation(used_locations, previous_unused_location));
-            output_fixed_fnc_textures[index] = id;
+            output_fixed_fnc_textures[index] =
+                DefineLegacyOutput(*this, used_locations, previous_unused_location, invocations);
         }
     }
     switch (stage) {
diff --git a/src/shader_recompiler/backend/spirv/emit_context.h b/src/shader_recompiler/backend/spirv/emit_context.h
index e1af12a38a..112c52382a 100644
--- a/src/shader_recompiler/backend/spirv/emit_context.h
+++ b/src/shader_recompiler/backend/spirv/emit_context.h
@@ -113,6 +113,9 @@ public:
     [[nodiscard]] Id BitOffset8(const IR::Value& offset);
     [[nodiscard]] Id BitOffset16(const IR::Value& offset);
 
+    Id InputLegacyAttribute(IR::Attribute attribute);
+    Id OutputLegacyAttribute(IR::Attribute attribute);
+
     Id Const(u32 value) {
         return Constant(U32[1], value);
     }
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
index 6fa99cc1a5..d3a93d5f43 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp
@@ -43,23 +43,12 @@ Id AttrPointer(EmitContext& ctx, Id pointer_type, Id vertex, Id base, Args&&...
     }
 }
 
-bool IsFixedFncTexture(IR::Attribute attribute) {
-    return attribute >= IR::Attribute::FixedFncTexture0S &&
-           attribute <= IR::Attribute::FixedFncTexture9Q;
-}
-
-u32 FixedFncTextureAttributeIndex(IR::Attribute attribute) {
-    if (!IsFixedFncTexture(attribute)) {
-        throw InvalidArgument("Attribute {} is not a FixedFncTexture", attribute);
-    }
-    return (static_cast<u32>(attribute) - static_cast<u32>(IR::Attribute::FixedFncTexture0S)) / 4u;
-}
-
-u32 FixedFncTextureAttributeElement(IR::Attribute attribute) {
-    if (!IsFixedFncTexture(attribute)) {
-        throw InvalidArgument("Attribute {} is not a FixedFncTexture", attribute);
-    }
-    return static_cast<u32>(attribute) % 4u;
+bool IsLegacyAttribute(IR::Attribute attribute) {
+    return (attribute >= IR::Attribute::ColorFrontDiffuseR &&
+            attribute <= IR::Attribute::ColorBackSpecularA) ||
+           attribute == IR::Attribute::FogCoordinate ||
+           (attribute >= IR::Attribute::FixedFncTexture0S &&
+            attribute <= IR::Attribute::FixedFncTexture9Q);
 }
 
 template <typename... Args>
@@ -93,12 +82,16 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
             return OutputAccessChain(ctx, ctx.output_f32, info.id, index_id);
         }
     }
-    if (IsFixedFncTexture(attr)) {
-        const u32 index{FixedFncTextureAttributeIndex(attr)};
-        const u32 element{FixedFncTextureAttributeElement(attr)};
-        const Id element_id{ctx.Const(element)};
-        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_fixed_fnc_textures[index],
-                                 element_id);
+    if (IsLegacyAttribute(attr)) {
+        if (attr == IR::Attribute::FogCoordinate) {
+            return OutputAccessChain(ctx, ctx.output_f32, ctx.OutputLegacyAttribute(attr),
+                                     ctx.Const(0u));
+        } else {
+            const u32 element{static_cast<u32>(attr) % 4};
+            const Id element_id{ctx.Const(element)};
+            return OutputAccessChain(ctx, ctx.output_f32, ctx.OutputLegacyAttribute(attr),
+                                     element_id);
+        }
     }
     switch (attr) {
     case IR::Attribute::PointSize:
@@ -111,43 +104,6 @@ std::optional<OutAttr> OutputAttrPointer(EmitContext& ctx, IR::Attribute attr) {
         const Id element_id{ctx.Const(element)};
         return OutputAccessChain(ctx, ctx.output_f32, ctx.output_position, element_id);
     }
-    case IR::Attribute::ColorFrontDiffuseR:
-    case IR::Attribute::ColorFrontDiffuseG:
-    case IR::Attribute::ColorFrontDiffuseB:
-    case IR::Attribute::ColorFrontDiffuseA: {
-        const u32 element{static_cast<u32>(attr) % 4};
-        const Id element_id{ctx.Const(element)};
-        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_front_color, element_id);
-    }
-    case IR::Attribute::ColorFrontSpecularR:
-    case IR::Attribute::ColorFrontSpecularG:
-    case IR::Attribute::ColorFrontSpecularB:
-    case IR::Attribute::ColorFrontSpecularA: {
-        const u32 element{static_cast<u32>(attr) % 4};
-        const Id element_id{ctx.Const(element)};
-        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_front_secondary_color, element_id);
-    }
-    case IR::Attribute::ColorBackDiffuseR:
-    case IR::Attribute::ColorBackDiffuseG:
-    case IR::Attribute::ColorBackDiffuseB:
-    case IR::Attribute::ColorBackDiffuseA: {
-        const u32 element{static_cast<u32>(attr) % 4};
-        const Id element_id{ctx.Const(element)};
-        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_back_color, element_id);
-    }
-    case IR::Attribute::ColorBackSpecularR:
-    case IR::Attribute::ColorBackSpecularG:
-    case IR::Attribute::ColorBackSpecularB:
-    case IR::Attribute::ColorBackSpecularA: {
-        const u32 element{static_cast<u32>(attr) % 4};
-        const Id element_id{ctx.Const(element)};
-        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_back_secondary_color, element_id);
-    }
-    case IR::Attribute::FogCoordinate: {
-        const u32 element{static_cast<u32>(attr) % 4};
-        const Id element_id{ctx.Const(element)};
-        return OutputAccessChain(ctx, ctx.output_f32, ctx.output_fog_frag_coord, element_id);
-    }
     case IR::Attribute::ClipDistance0:
     case IR::Attribute::ClipDistance1:
     case IR::Attribute::ClipDistance2:
@@ -370,11 +326,17 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
         const Id value{ctx.OpLoad(type->id, pointer)};
         return type->needs_cast ? ctx.OpBitcast(ctx.F32[1], value) : value;
     }
-    if (IsFixedFncTexture(attr)) {
-        const u32 index{FixedFncTextureAttributeIndex(attr)};
-        const Id attr_id{ctx.input_fixed_fnc_textures[index]};
-        const Id attr_ptr{AttrPointer(ctx, ctx.input_f32, vertex, attr_id, ctx.Const(element))};
-        return ctx.OpLoad(ctx.F32[1], attr_ptr);
+    if (IsLegacyAttribute(attr)) {
+        if (attr == IR::Attribute::FogCoordinate) {
+            const Id attr_ptr{AttrPointer(ctx, ctx.input_f32, vertex,
+                                          ctx.InputLegacyAttribute(attr), ctx.Const(0u))};
+            return ctx.OpLoad(ctx.F32[1], attr_ptr);
+        } else {
+            const Id element_id{ctx.Const(element)};
+            const Id attr_ptr{AttrPointer(ctx, ctx.input_f32, vertex,
+                                          ctx.InputLegacyAttribute(attr), element_id)};
+            return ctx.OpLoad(ctx.F32[1], attr_ptr);
+        }
     }
     switch (attr) {
     case IR::Attribute::PrimitiveId:
@@ -385,40 +347,6 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
     case IR::Attribute::PositionW:
         return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_position,
                                                   ctx.Const(element)));
-    case IR::Attribute::ColorFrontDiffuseR:
-    case IR::Attribute::ColorFrontDiffuseG:
-    case IR::Attribute::ColorFrontDiffuseB:
-    case IR::Attribute::ColorFrontDiffuseA: {
-        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_color,
-                                                  ctx.Const(element)));
-    }
-    case IR::Attribute::ColorFrontSpecularR:
-    case IR::Attribute::ColorFrontSpecularG:
-    case IR::Attribute::ColorFrontSpecularB:
-    case IR::Attribute::ColorFrontSpecularA: {
-        return ctx.OpLoad(ctx.F32[1],
-                          AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_front_secondary_color,
-                                      ctx.Const(element)));
-    }
-    case IR::Attribute::ColorBackDiffuseR:
-    case IR::Attribute::ColorBackDiffuseG:
-    case IR::Attribute::ColorBackDiffuseB:
-    case IR::Attribute::ColorBackDiffuseA: {
-        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_color,
-                                                  ctx.Const(element)));
-    }
-    case IR::Attribute::ColorBackSpecularR:
-    case IR::Attribute::ColorBackSpecularG:
-    case IR::Attribute::ColorBackSpecularB:
-    case IR::Attribute::ColorBackSpecularA: {
-        return ctx.OpLoad(ctx.F32[1],
-                          AttrPointer(ctx, ctx.input_f32, vertex, ctx.input_back_secondary_color,
-                                      ctx.Const(element)));
-    }
-    case IR::Attribute::FogCoordinate: {
-        return ctx.OpLoad(ctx.F32[1], AttrPointer(ctx, ctx.input_f32, vertex,
-                                                  ctx.input_fog_frag_coord, ctx.Const(element)));
-    }
     case IR::Attribute::InstanceId:
         if (ctx.profile.support_vertex_instance_id) {
             return ctx.OpBitcast(ctx.F32[1], ctx.OpLoad(ctx.U32[1], ctx.instance_id));