Shader_Ir: Implement F16 Variants of F2F, F2I, I2F.

This commit takes care of implementing the F16 Variants of the 
conversion instructions and makes sure conversions are done.

src/video_core/engines/shader_bytecode.h

@@ -1018,8 +1018,6 @@ union Instruction {
         } f2i;
 
         union {
-            BitField<8, 2, Register::Size> src_size;
-            BitField<10, 2, Register::Size> dst_size;
             BitField<39, 4, u64> rounding;
             // H0, H1 extract for F16 missing
             BitField<41, 1, u64> selector; // Guessed as some games set it, TODO: reverse this value

src/video_core/renderer_opengl/gl_shader_decompiler.cpp

@@ -1122,6 +1122,16 @@ private:
                                Type::Float);
     }
 
+    std::string FCastHalf0(Operation operation) {
+        const std::string op_a = VisitOperand(operation, 0, Type::HalfFloat);
+        return fmt::format("({})[0]", op_a);
+    }
+
+    std::string FCastHalf1(Operation operation) {
+        const std::string op_a = VisitOperand(operation, 0, Type::HalfFloat);
+        return fmt::format("({})[1]", op_a);
+    }
+
     template <Type type>
     std::string Min(Operation operation) {
         return GenerateBinaryCall(operation, "min", type, type, type);
@@ -1278,6 +1288,11 @@ private:
         return ApplyPrecise(operation, BitwiseCastResult(clamped, Type::HalfFloat));
     }
 
+    std::string HCastFloat(Operation operation) {
+        const std::string op_a = VisitOperand(operation, 0, Type::Float);
+        return fmt::format("fromHalf2(vec2({}, 0.0f))", op_a);
+    }
+
     std::string HUnpack(Operation operation) {
         const std::string operand{VisitOperand(operation, 0, Type::HalfFloat)};
         const auto value = [&]() -> std::string {
@@ -1718,6 +1733,8 @@ private:
         &GLSLDecompiler::Negate<Type::Float>,
         &GLSLDecompiler::Absolute<Type::Float>,
         &GLSLDecompiler::FClamp,
+        &GLSLDecompiler::FCastHalf0,
+        &GLSLDecompiler::FCastHalf1,
         &GLSLDecompiler::Min<Type::Float>,
         &GLSLDecompiler::Max<Type::Float>,
         &GLSLDecompiler::FCos,
@@ -1778,6 +1795,7 @@ private:
         &GLSLDecompiler::Absolute<Type::HalfFloat>,
         &GLSLDecompiler::HNegate,
         &GLSLDecompiler::HClamp,
+        &GLSLDecompiler::HCastFloat,
         &GLSLDecompiler::HUnpack,
         &GLSLDecompiler::HMergeF32,
         &GLSLDecompiler::HMergeH0,

src/video_core/renderer_vulkan/vk_shader_decompiler.cpp

@@ -735,6 +735,16 @@ private:
         return {};
     }
 
+    Id FCastHalf0(Operation operation) {
+        UNIMPLEMENTED();
+        return {};
+    }
+
+    Id FCastHalf1(Operation operation) {
+        UNIMPLEMENTED();
+        return {};
+    }
+
     Id HNegate(Operation operation) {
         UNIMPLEMENTED();
         return {};
@@ -745,6 +755,11 @@ private:
         return {};
     }
 
+    Id HCastFloat(Operation operation) {
+        UNIMPLEMENTED();
+        return {};
+    }
+
     Id HUnpack(Operation operation) {
         UNIMPLEMENTED();
         return {};
@@ -1210,6 +1225,8 @@ private:
         &SPIRVDecompiler::Unary<&Module::OpFNegate, Type::Float>,
         &SPIRVDecompiler::Unary<&Module::OpFAbs, Type::Float>,
         &SPIRVDecompiler::Ternary<&Module::OpFClamp, Type::Float>,
+        &SPIRVDecompiler::FCastHalf0,
+        &SPIRVDecompiler::FCastHalf1,
         &SPIRVDecompiler::Binary<&Module::OpFMin, Type::Float>,
         &SPIRVDecompiler::Binary<&Module::OpFMax, Type::Float>,
         &SPIRVDecompiler::Unary<&Module::OpCos, Type::Float>,
@@ -1270,6 +1287,7 @@ private:
         &SPIRVDecompiler::Unary<&Module::OpFAbs, Type::HalfFloat>,
         &SPIRVDecompiler::HNegate,
         &SPIRVDecompiler::HClamp,
+        &SPIRVDecompiler::HCastFloat,
         &SPIRVDecompiler::HUnpack,
         &SPIRVDecompiler::HMergeF32,
         &SPIRVDecompiler::HMergeH0,

src/video_core/shader/decode/conversion.cpp

@@ -57,7 +57,7 @@ u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
     case OpCode::Id::I2F_R:
     case OpCode::Id::I2F_C:
     case OpCode::Id::I2F_IMM: {
-        UNIMPLEMENTED_IF(instr.conversion.dst_size != Register::Size::Word);
+        UNIMPLEMENTED_IF(instr.conversion.dst_size == Register::Size::Long);
         UNIMPLEMENTED_IF(instr.conversion.selector);
         UNIMPLEMENTED_IF_MSG(instr.generates_cc,
                              "Condition codes generation in I2F is not implemented");
@@ -82,14 +82,19 @@ u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
         value = GetOperandAbsNegFloat(value, false, instr.conversion.negate_a);
 
         SetInternalFlagsFromFloat(bb, value, instr.generates_cc);
+
+        if (instr.conversion.dst_size == Register::Size::Short) {
+            value = Operation(OperationCode::HCastFloat, PRECISE, value);
+        }
+
         SetRegister(bb, instr.gpr0, value);
         break;
     }
     case OpCode::Id::F2F_R:
     case OpCode::Id::F2F_C:
     case OpCode::Id::F2F_IMM: {
-        UNIMPLEMENTED_IF(instr.conversion.f2f.dst_size != Register::Size::Word);
+        UNIMPLEMENTED_IF(instr.conversion.dst_size == Register::Size::Long);
-        UNIMPLEMENTED_IF(instr.conversion.f2f.src_size != Register::Size::Word);
+        UNIMPLEMENTED_IF(instr.conversion.src_size == Register::Size::Long);
         UNIMPLEMENTED_IF_MSG(instr.generates_cc,
                              "Condition codes generation in F2F is not implemented");
 
@@ -107,6 +112,11 @@ u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
             }
         }();
 
+        if (instr.conversion.src_size == Register::Size::Short) {
+            // TODO: figure where extract is sey in the encoding
+            value = Operation(OperationCode::FCastHalf0, PRECISE, value);
+        }
+
         value = GetOperandAbsNegFloat(value, instr.conversion.abs_a, instr.conversion.negate_a);
 
         value = [&]() {
@@ -124,19 +134,24 @@ u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
             default:
                 UNIMPLEMENTED_MSG("Unimplemented F2F rounding mode {}",
                                   static_cast<u32>(instr.conversion.f2f.rounding.Value()));
-                return Immediate(0);
+                return value;
             }
         }();
         value = GetSaturatedFloat(value, instr.alu.saturate_d);
 
         SetInternalFlagsFromFloat(bb, value, instr.generates_cc);
+
+        if (instr.conversion.dst_size == Register::Size::Short) {
+            value = Operation(OperationCode::HCastFloat, PRECISE, value);
+        }
+
         SetRegister(bb, instr.gpr0, value);
         break;
     }
     case OpCode::Id::F2I_R:
     case OpCode::Id::F2I_C:
     case OpCode::Id::F2I_IMM: {
-        UNIMPLEMENTED_IF(instr.conversion.src_size != Register::Size::Word);
+        UNIMPLEMENTED_IF(instr.conversion.src_size == Register::Size::Long);
         UNIMPLEMENTED_IF_MSG(instr.generates_cc,
                              "Condition codes generation in F2I is not implemented");
         Node value = [&]() {
@@ -153,6 +168,11 @@ u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
             }
         }();
 
+        if (instr.conversion.src_size == Register::Size::Short) {
+            // TODO: figure where extract is sey in the encoding
+            value = Operation(OperationCode::FCastHalf0, PRECISE, value);
+        }
+
         value = GetOperandAbsNegFloat(value, instr.conversion.abs_a, instr.conversion.negate_a);
 
         value = [&]() {

src/video_core/shader/node.h

@@ -30,6 +30,8 @@ enum class OperationCode {
     FNegate,       /// (MetaArithmetic, float a) -> float
     FAbsolute,     /// (MetaArithmetic, float a) -> float
     FClamp,        /// (MetaArithmetic, float value, float min, float max) -> float
+    FCastHalf0,    /// (MetaArithmetic, f16vec2 a) -> float
+    FCastHalf1,    /// (MetaArithmetic, f16vec2 a) -> float
     FMin,          /// (MetaArithmetic, float a, float b) -> float
     FMax,          /// (MetaArithmetic, float a, float b) -> float
     FCos,          /// (MetaArithmetic, float a) -> float
@@ -89,6 +91,7 @@ enum class OperationCode {
     HAbsolute,  /// (f16vec2 a) -> f16vec2
     HNegate,    /// (f16vec2 a, bool first, bool second) -> f16vec2
     HClamp,     /// (f16vec2 src, float min, float max) -> f16vec2
+    HCastFloat, /// (MetaArithmetic, float a) -> f16vec2
     HUnpack,    /// (Tegra::Shader::HalfType, T value) -> f16vec2
     HMergeF32,  /// (f16vec2 src) -> float
     HMergeH0,   /// (f16vec2 dest, f16vec2 src) -> f16vec2