5 files changed, 86 insertions, 39 deletions

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index 6f98bd827..f443ec0fe 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -227,6 +227,28 @@ enum class AtomicOp : u64 {
     Exch = 8,
 };
 
+enum class GlobalAtomicOp : u64 {
+    Add = 0,
+    Min = 1,
+    Max = 2,
+    Inc = 3,
+    Dec = 4,
+    And = 5,
+    Or = 6,
+    Xor = 7,
+    Exch = 8,
+    SafeAdd = 10,
+};
+
+enum class GlobalAtomicType : u64 {
+    U32 = 0,
+    S32 = 1,
+    U64 = 2,
+    F32_FTZ_RN = 3,
+    F16x2_FTZ_RN = 4,
+    S64 = 5,
+};
+
 enum class UniformType : u64 {
     UnsignedByte = 0,
     SignedByte = 1,
@@ -958,6 +980,12 @@ union Instruction {
     } stg;
 
     union {
+        BitField<52, 4, GlobalAtomicOp> operation;
+        BitField<49, 3, GlobalAtomicType> type;
+        BitField<28, 20, s64> offset;
+    } atom;
+
+    union {
         BitField<52, 4, AtomicOp> operation;
         BitField<28, 2, AtomicType> type;
         BitField<30, 22, s64> offset;
@@ -1690,6 +1718,7 @@ public:
         ST_S,
         ST,    // Store in generic memory
         STG,   // Store in global memory
+        ATOM,  // Atomic operation on global memory
         ATOMS, // Atomic operation on shared memory
         AL2P,  // Transforms attribute memory into physical memory
         TEX,
@@ -1994,6 +2023,7 @@ private:
             INST("1110111101010---", Id::ST_L, Type::Memory, "ST_L"),
             INST("101-------------", Id::ST, Type::Memory, "ST"),
             INST("1110111011011---", Id::STG, Type::Memory, "STG"),
+            INST("11101101--------", Id::ATOM, Type::Memory, "ATOM"),
             INST("11101100--------", Id::ATOMS, Type::Memory, "ATOMS"),
             INST("1110111110100---", Id::AL2P, Type::Memory, "AL2P"),
             INST("110000----111---", Id::TEX, Type::Texture, "TEX"),
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index 6531dfe9b..a1ac3d7a9 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -1857,10 +1857,7 @@ private:
 
     template <const std::string_view& opname, Type type>
     Expression Atomic(Operation operation) {
-        ASSERT(stage == ShaderType::Compute);
-        auto& smem = std::get<SmemNode>(*operation[0]);
-
-        return {fmt::format("atomic{}(smem[{} >> 2], {})", opname, Visit(smem.GetAddress()).AsInt(),
+        return {fmt::format("atomic{}({}, {})", opname, Visit(operation[0]).GetCode(),
                             Visit(operation[1]).As(type)),
                 type};
     }
diff --git a/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp b/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
index b53078721..1ab22251e 100644
--- a/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
+++ b/src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
@@ -1123,15 +1123,7 @@ private:
         }
 
         if (const auto gmem = std::get_if<GmemNode>(&*node)) {
-            const Id gmem_buffer = global_buffers.at(gmem->GetDescriptor());
-            const Id real = AsUint(Visit(gmem->GetRealAddress()));
-            const Id base = AsUint(Visit(gmem->GetBaseAddress()));
-
-            Id offset = OpISub(t_uint, real, base);
-            offset = OpUDiv(t_uint, offset, Constant(t_uint, 4U));
-            return {OpLoad(t_float,
-                           OpAccessChain(t_gmem_float, gmem_buffer, Constant(t_uint, 0U), offset)),
-                    Type::Float};
+            return {OpLoad(t_uint, GetGlobalMemoryPointer(*gmem)), Type::Uint};
         }
 
         if (const auto lmem = std::get_if<LmemNode>(&*node)) {
@@ -1142,10 +1134,7 @@ private:
         }
 
         if (const auto smem = std::get_if<SmemNode>(&*node)) {
-            Id address = AsUint(Visit(smem->GetAddress()));
-            address = OpShiftRightLogical(t_uint, address, Constant(t_uint, 2U));
-            const Id pointer = OpAccessChain(t_smem_uint, shared_memory, address);
-            return {OpLoad(t_uint, pointer), Type::Uint};
+            return {OpLoad(t_uint, GetSharedMemoryPointer(*smem)), Type::Uint};
         }
 
         if (const auto internal_flag = std::get_if<InternalFlagNode>(&*node)) {
@@ -1339,20 +1328,10 @@ private:
             target = {OpAccessChain(t_prv_float, local_memory, address), Type::Float};
 
         } else if (const auto smem = std::get_if<SmemNode>(&*dest)) {
-            ASSERT(stage == ShaderType::Compute);
-            Id address = AsUint(Visit(smem->GetAddress()));
-            address = OpShiftRightLogical(t_uint, address, Constant(t_uint, 2U));
-            target = {OpAccessChain(t_smem_uint, shared_memory, address), Type::Uint};
+            target = {GetSharedMemoryPointer(*smem), Type::Uint};
 
         } else if (const auto gmem = std::get_if<GmemNode>(&*dest)) {
-            const Id real = AsUint(Visit(gmem->GetRealAddress()));
-            const Id base = AsUint(Visit(gmem->GetBaseAddress()));
-            const Id diff = OpISub(t_uint, real, base);
-            const Id offset = OpShiftRightLogical(t_uint, diff, Constant(t_uint, 2));
-
-            const Id gmem_buffer = global_buffers.at(gmem->GetDescriptor());
-            target = {OpAccessChain(t_gmem_float, gmem_buffer, Constant(t_uint, 0), offset),
-                      Type::Float};
+            target = {GetGlobalMemoryPointer(*gmem), Type::Uint};
 
         } else {
             UNIMPLEMENTED();
@@ -1804,11 +1783,16 @@ private:
         return {};
     }
 
-    Expression UAtomicAdd(Operation operation) {
-        const auto& smem = std::get<SmemNode>(*operation[0]);
-        Id address = AsUint(Visit(smem.GetAddress()));
-        address = OpShiftRightLogical(t_uint, address, Constant(t_uint, 2U));
-        const Id pointer = OpAccessChain(t_smem_uint, shared_memory, address);
+    Expression AtomicAdd(Operation operation) {
+        Id pointer;
+        if (const auto smem = std::get_if<SmemNode>(&*operation[0])) {
+            pointer = GetSharedMemoryPointer(*smem);
+        } else if (const auto gmem = std::get_if<GmemNode>(&*operation[0])) {
+            pointer = GetGlobalMemoryPointer(*gmem);
+        } else {
+            UNREACHABLE();
+            return {Constant(t_uint, 0), Type::Uint};
+        }
 
         const Id scope = Constant(t_uint, static_cast<u32>(spv::Scope::Device));
         const Id semantics = Constant(t_uint, 0U);
@@ -2243,6 +2227,22 @@ private:
         return {};
     }
 
+    Id GetGlobalMemoryPointer(const GmemNode& gmem) {
+        const Id real = AsUint(Visit(gmem.GetRealAddress()));
+        const Id base = AsUint(Visit(gmem.GetBaseAddress()));
+        const Id diff = OpISub(t_uint, real, base);
+        const Id offset = OpShiftRightLogical(t_uint, diff, Constant(t_uint, 2));
+        const Id buffer = global_buffers.at(gmem.GetDescriptor());
+        return OpAccessChain(t_gmem_uint, buffer, Constant(t_uint, 0), offset);
+    }
+
+    Id GetSharedMemoryPointer(const SmemNode& smem) {
+        ASSERT(stage == ShaderType::Compute);
+        Id address = AsUint(Visit(smem.GetAddress()));
+        address = OpShiftRightLogical(t_uint, address, Constant(t_uint, 2U));
+        return OpAccessChain(t_smem_uint, shared_memory, address);
+    }
+
     static constexpr std::array operation_decompilers = {
         &SPIRVDecompiler::Assign,
 
@@ -2389,7 +2389,7 @@ private:
         &SPIRVDecompiler::AtomicImageXor,
         &SPIRVDecompiler::AtomicImageExchange,
 
-        &SPIRVDecompiler::UAtomicAdd,
+        &SPIRVDecompiler::AtomicAdd,
 
         &SPIRVDecompiler::Branch,
         &SPIRVDecompiler::BranchIndirect,
@@ -2485,9 +2485,9 @@ private:
 
     Id t_smem_uint{};
 
-    const Id t_gmem_float = TypePointer(spv::StorageClass::StorageBuffer, t_float);
+    const Id t_gmem_uint = TypePointer(spv::StorageClass::StorageBuffer, t_uint);
     const Id t_gmem_array =
-        Name(Decorate(TypeRuntimeArray(t_float), spv::Decoration::ArrayStride, 4U), "GmemArray");
+        Name(Decorate(TypeRuntimeArray(t_uint), spv::Decoration::ArrayStride, 4U), "GmemArray");
     const Id t_gmem_struct = MemberDecorate(
         Decorate(TypeStruct(t_gmem_array), spv::Decoration::Block), 0, spv::Decoration::Offset, 0);
     const Id t_gmem_ssbo = TypePointer(spv::StorageClass::StorageBuffer, t_gmem_struct);
diff --git a/src/video_core/shader/decode/memory.cpp b/src/video_core/shader/decode/memory.cpp
index 7591a715f..3da833e81 100644
--- a/src/video_core/shader/decode/memory.cpp
+++ b/src/video_core/shader/decode/memory.cpp
@@ -19,6 +19,8 @@ namespace VideoCommon::Shader {
 using Tegra::Shader::AtomicOp;
 using Tegra::Shader::AtomicType;
 using Tegra::Shader::Attribute;
+using Tegra::Shader::GlobalAtomicOp;
+using Tegra::Shader::GlobalAtomicType;
 using Tegra::Shader::Instruction;
 using Tegra::Shader::OpCode;
 using Tegra::Shader::Register;
@@ -335,6 +337,24 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
         }
         break;
     }
+    case OpCode::Id::ATOM: {
+        UNIMPLEMENTED_IF_MSG(instr.atom.operation != GlobalAtomicOp::Add, "operation={}",
+                             static_cast<int>(instr.atom.operation.Value()));
+        UNIMPLEMENTED_IF_MSG(instr.atom.type != GlobalAtomicType::S32, "type={}",
+                             static_cast<int>(instr.atom.type.Value()));
+
+        const auto [real_address, base_address, descriptor] =
+            TrackGlobalMemory(bb, instr, true, true);
+        if (!real_address || !base_address) {
+            // Tracking failed, skip atomic.
+            break;
+        }
+
+        Node gmem = MakeNode<GmemNode>(real_address, base_address, descriptor);
+        Node value = Operation(OperationCode::AtomicAdd, std::move(gmem), GetRegister(instr.gpr20));
+        SetRegister(bb, instr.gpr0, std::move(value));
+        break;
+    }
     case OpCode::Id::ATOMS: {
         UNIMPLEMENTED_IF_MSG(instr.atoms.operation != AtomicOp::Add, "operation={}",
                              static_cast<int>(instr.atoms.operation.Value()));
@@ -348,7 +368,7 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
         Node memory = GetSharedMemory(std::move(address));
         Node data = GetRegister(instr.gpr20);
 
-        Node value = Operation(OperationCode::UAtomicAdd, std::move(memory), std::move(data));
+        Node value = Operation(OperationCode::AtomicAdd, std::move(memory), std::move(data));
         SetRegister(bb, instr.gpr0, std::move(value));
         break;
     }
diff --git a/src/video_core/shader/node.h b/src/video_core/shader/node.h
index 075c7d07c..9af1f0228 100644
--- a/src/video_core/shader/node.h
+++ b/src/video_core/shader/node.h
@@ -162,7 +162,7 @@ enum class OperationCode {
     AtomicImageXor,      /// (MetaImage, int[N] coords) -> void
     AtomicImageExchange, /// (MetaImage, int[N] coords) -> void
 
-    UAtomicAdd, /// (smem, uint) -> uint
+    AtomicAdd, /// (memory, {u}int) -> {u}int
 
     Branch,         /// (uint branch_target) -> void
     BranchIndirect, /// (uint branch_target) -> void