1 files changed, 133 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_conversion_integer.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_conversion_integer.cpp
new file mode 100644
index 000000000..c4288d9a8
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_conversion_integer.cpp
@@ -0,0 +1,133 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/common_types.h"
+#include "shader_recompiler/exception.h"
+#include "shader_recompiler/frontend/maxwell/opcode.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
+
+namespace Shader::Maxwell {
+namespace {
+enum class DestFormat : u64 {
+    Invalid,
+    I16,
+    I32,
+    I64,
+};
+enum class SrcFormat : u64 {
+    Invalid,
+    F16,
+    F32,
+    F64,
+};
+enum class Rounding : u64 {
+    Round,
+    Floor,
+    Ceil,
+    Trunc,
+};
+
+union F2I {
+    u64 raw;
+    BitField<0, 8, IR::Reg> dest_reg;
+    BitField<8, 2, DestFormat> dest_format;
+    BitField<10, 2, SrcFormat> src_format;
+    BitField<12, 1, u64> is_signed;
+    BitField<39, 1, Rounding> rounding;
+    BitField<49, 1, u64> half;
+    BitField<44, 1, u64> ftz;
+    BitField<45, 1, u64> abs;
+    BitField<47, 1, u64> cc;
+    BitField<49, 1, u64> neg;
+};
+
+size_t BitSize(DestFormat dest_format) {
+    switch (dest_format) {
+    case DestFormat::I16:
+        return 16;
+    case DestFormat::I32:
+        return 32;
+    case DestFormat::I64:
+        return 64;
+    default:
+        throw NotImplementedException("Invalid destination format {}", dest_format);
+    }
+}
+
+void TranslateF2I(TranslatorVisitor& v, u64 insn, const IR::U16U32U64& op_a) {
+    // F2I is used to convert from a floating point value to an integer
+    const F2I f2i{insn};
+
+    const IR::U16U32U64 float_value{v.ir.FPAbsNeg(op_a, f2i.abs != 0, f2i.neg != 0)};
+    const IR::U16U32U64 rounded_value{[&] {
+        switch (f2i.rounding) {
+        case Rounding::Round:
+            return v.ir.FPRoundEven(float_value);
+        case Rounding::Floor:
+            return v.ir.FPFloor(float_value);
+        case Rounding::Ceil:
+            return v.ir.FPCeil(float_value);
+        case Rounding::Trunc:
+            return v.ir.FPTrunc(float_value);
+        default:
+            throw NotImplementedException("Invalid F2I rounding {}", f2i.rounding.Value());
+        }
+    }()};
+
+    // TODO: Handle out of bounds conversions.
+    // For example converting F32 65537.0 to U16, the expected value is 0xffff,
+
+    const bool is_signed{f2i.is_signed != 0};
+    const size_t bitsize{BitSize(f2i.dest_format)};
+    const IR::U16U32U64 result{v.ir.ConvertFToI(bitsize, is_signed, rounded_value)};
+
+    v.X(f2i.dest_reg, result);
+
+    if (f2i.cc != 0) {
+        v.SetZFlag(v.ir.GetZeroFromOp(result));
+        if (is_signed) {
+            v.SetSFlag(v.ir.GetSignFromOp(result));
+        } else {
+            v.ResetSFlag();
+        }
+        v.ResetCFlag();
+
+        // TODO: Investigate if out of bound conversions sets the overflow flag
+        v.ResetOFlag();
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::F2I_reg(u64 insn) {
+    union {
+        F2I base;
+        BitField<20, 8, IR::Reg> src_reg;
+    } const f2i{insn};
+
+    const IR::U16U32U64 op_a{[&]() -> IR::U16U32U64 {
+        switch (f2i.base.src_format) {
+        case SrcFormat::F16:
+            return ir.CompositeExtract(ir.UnpackFloat2x16(X(f2i.src_reg)), f2i.base.half);
+        case SrcFormat::F32:
+            return X(f2i.src_reg);
+        case SrcFormat::F64:
+            return ir.PackDouble2x32(ir.CompositeConstruct(X(f2i.src_reg), X(f2i.src_reg + 1)));
+        default:
+            throw NotImplementedException("Invalid F2I source format {}",
+                                          f2i.base.src_format.Value());
+        }
+    }()};
+
+    TranslateF2I(*this, insn, op_a);
+}
+
+void TranslatorVisitor::F2I_cbuf(u64) {
+    throw NotImplementedException("{}", Opcode::F2I_cbuf);
+}
+
+void TranslatorVisitor::F2I_imm(u64) {
+    throw NotImplementedException("{}", Opcode::F2I_imm);
+}
+
+} // namespace Shader::Maxwell