shader/video: Partially implement VMNMX

Implements the common usages for VMNMX. Inputs with a different size
than 32 bits are not supported and sign mismatches aren't supported
either.

VMNMX works as follows:
It grabs Ra and Rb and applies a maximum/minimum on them (this is
defined by .MX), having in mind the input sign. This result can then be
saturated. After the intermediate result is calculated, it applies
another operation on it using Rc. These operations are merges,
accumulations or another min/max pass.

This instruction allows to implement with a more flexible approach GCN's
min3 and max3 instructions (for instance).

1 files changed, 58 insertions, 0 deletions

diff --git a/src/video_core/shader/decode/video.cpp b/src/video_core/shader/decode/video.cpp
index b047cf870..64ba60ea2 100644
--- a/src/video_core/shader/decode/video.cpp
+++ b/src/video_core/shader/decode/video.cpp
@@ -10,16 +10,24 @@
 
 namespace VideoCommon::Shader {
 
+using std::move;
 using Tegra::Shader::Instruction;
 using Tegra::Shader::OpCode;
 using Tegra::Shader::Pred;
 using Tegra::Shader::VideoType;
 using Tegra::Shader::VmadShr;
+using Tegra::Shader::VmnmxOperation;
+using Tegra::Shader::VmnmxType;
 
 u32 ShaderIR::DecodeVideo(NodeBlock& bb, u32 pc) {
     const Instruction instr = {program_code[pc]};
     const auto opcode = OpCode::Decode(instr);
 
+    if (opcode->get().GetId() == OpCode::Id::VMNMX) {
+        DecodeVMNMX(bb, instr);
+        return pc;
+    }
+
     const Node op_a =
         GetVideoOperand(GetRegister(instr.gpr8), instr.video.is_byte_chunk_a, instr.video.signed_a,
                         instr.video.type_a, instr.video.byte_height_a);
@@ -109,4 +117,54 @@ Node ShaderIR::GetVideoOperand(Node op, bool is_chunk, bool is_signed,
     }
 }
 
+void ShaderIR::DecodeVMNMX(NodeBlock& bb, Tegra::Shader::Instruction instr) {
+    UNIMPLEMENTED_IF(!instr.vmnmx.is_op_b_register);
+    UNIMPLEMENTED_IF(instr.vmnmx.SourceFormatA() != VmnmxType::Bits32);
+    UNIMPLEMENTED_IF(instr.vmnmx.SourceFormatB() != VmnmxType::Bits32);
+    UNIMPLEMENTED_IF(instr.vmnmx.is_src_a_signed != instr.vmnmx.is_src_b_signed);
+    UNIMPLEMENTED_IF(instr.vmnmx.sat);
+    UNIMPLEMENTED_IF(instr.generates_cc);
+
+    Node op_a = GetRegister(instr.gpr8);
+    Node op_b = GetRegister(instr.gpr20);
+    Node op_c = GetRegister(instr.gpr39);
+
+    const bool is_oper1_signed = instr.vmnmx.is_src_a_signed; // Stubbed
+    const bool is_oper2_signed = instr.vmnmx.is_dest_signed;
+
+    const auto operation_a = instr.vmnmx.mx ? OperationCode::IMax : OperationCode::IMin;
+    Node value = SignedOperation(operation_a, is_oper1_signed, move(op_a), move(op_b));
+
+    switch (instr.vmnmx.operation) {
+    case VmnmxOperation::Mrg_16H:
+        value = BitfieldInsert(move(op_c), move(value), 16, 16);
+        break;
+    case VmnmxOperation::Mrg_16L:
+        value = BitfieldInsert(move(op_c), move(value), 0, 16);
+        break;
+    case VmnmxOperation::Mrg_8B0:
+        value = BitfieldInsert(move(op_c), move(value), 0, 8);
+        break;
+    case VmnmxOperation::Mrg_8B2:
+        value = BitfieldInsert(move(op_c), move(value), 16, 8);
+        break;
+    case VmnmxOperation::Acc:
+        value = Operation(OperationCode::IAdd, move(value), move(op_c));
+        break;
+    case VmnmxOperation::Min:
+        value = SignedOperation(OperationCode::IMin, is_oper2_signed, move(value), move(op_c));
+        break;
+    case VmnmxOperation::Max:
+        value = SignedOperation(OperationCode::IMax, is_oper2_signed, move(value), move(op_c));
+        break;
+    case VmnmxOperation::Nop:
+        break;
+    default:
+        UNREACHABLE();
+        break;
+    }
+
+    SetRegister(bb, instr.gpr0, move(value));
+}
+
 } // namespace VideoCommon::Shader