Merge pull request #1927 from ReinUsesLisp/shader-ir

video_core: Replace gl_shader_decompiler with an IR based decompiler

1 files changed, 52 insertions, 0 deletions

diff --git a/src/video_core/shader/decode/arithmetic_immediate.cpp b/src/video_core/shader/decode/arithmetic_immediate.cpp
new file mode 100644
index 000000000..4fd3db54e
--- /dev/null
+++ b/src/video_core/shader/decode/arithmetic_immediate.cpp
@@ -0,0 +1,52 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "video_core/engines/shader_bytecode.h"
+#include "video_core/shader/shader_ir.h"
+
+namespace VideoCommon::Shader {
+
+using Tegra::Shader::Instruction;
+using Tegra::Shader::OpCode;
+
+u32 ShaderIR::DecodeArithmeticImmediate(BasicBlock& bb, const BasicBlock& code, u32 pc) {
+    const Instruction instr = {program_code[pc]};
+    const auto opcode = OpCode::Decode(instr);
+
+    switch (opcode->get().GetId()) {
+    case OpCode::Id::MOV32_IMM: {
+        SetRegister(bb, instr.gpr0, GetImmediate32(instr));
+        break;
+    }
+    case OpCode::Id::FMUL32_IMM: {
+        Node value =
+            Operation(OperationCode::FMul, PRECISE, GetRegister(instr.gpr8), GetImmediate32(instr));
+        value = GetSaturatedFloat(value, instr.fmul32.saturate);
+
+        SetInternalFlagsFromFloat(bb, value, instr.op_32.generates_cc);
+        SetRegister(bb, instr.gpr0, value);
+        break;
+    }
+    case OpCode::Id::FADD32I: {
+        const Node op_a = GetOperandAbsNegFloat(GetRegister(instr.gpr8), instr.fadd32i.abs_a,
+                                                instr.fadd32i.negate_a);
+        const Node op_b = GetOperandAbsNegFloat(GetImmediate32(instr), instr.fadd32i.abs_b,
+                                                instr.fadd32i.negate_b);
+
+        const Node value = Operation(OperationCode::FAdd, PRECISE, op_a, op_b);
+        SetInternalFlagsFromFloat(bb, value, instr.op_32.generates_cc);
+        SetRegister(bb, instr.gpr0, value);
+        break;
+    }
+    default:
+        UNIMPLEMENTED_MSG("Unhandled arithmetic immediate instruction: {}",
+                          opcode->get().GetName());
+    }
+
+    return pc;
+}
+
+} // namespace VideoCommon::Shader
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