Shuffling spirv code so it's not tied to xe::gpu.

Will make it easier to use in standalone apps.

src/xenia/gpu/shader_translator.cc

@@ -0,0 +1,62 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/gpu/shader_translator.h"
+
+#include <string>
+
+#include "third_party/spirv-tools/include/libspirv/libspirv.h"
+#include "xenia/ui/spirv/spirv_assembler.h"
+#include "xenia/ui/spirv/spirv_disassembler.h"
+#include "xenia/ui/spirv/spirv_emitter.h"
+
+namespace xe {
+namespace gpu {
+
+ShaderTranslator::ShaderTranslator() {
+  // HACK(benvanik): in-progress test code just to make sure things compile.
+  const std::string spirv_source = R"(
+OpCapability Shader
+%1 = OpExtInstImport "GLSL.std.450"
+OpMemoryModel Logical Simple
+OpEntryPoint Vertex %2 "main"
+%3 = OpTypeVoid
+%4 = OpTypeFunction %3
+%2 = OpFunction %3 None %4
+%5 = OpLabel
+OpReturn
+OpFunctionEnd
+)";
+
+  xe::ui::spirv::SpirvAssembler spirv_asm;
+  auto asm_result = spirv_asm.Assemble(spirv_source);
+
+  xe::ui::spirv::SpirvDisassembler spirv_disasm;
+  auto disasm_result =
+      spirv_disasm.Disassemble(asm_result->words(), asm_result->word_count());
+
+  xe::ui::spirv::SpirvEmitter e;
+  auto glsl_std_450 = e.ImportExtendedInstructions("GLSL.std.450");
+  auto fn = e.MakeMainEntry();
+  auto float_1_0 = e.MakeFloatConstant(1.0f);
+  auto acos = e.CreateExtendedInstructionCall(
+      spv::Decoration::Invariant, e.MakeFloatType(32), glsl_std_450,
+      static_cast<int>(spv::GLSLstd450::Acos), {{float_1_0}});
+  e.MakeReturn(true);
+
+  std::vector<uint32_t> words;
+  e.Serialize(words);
+
+  auto disasm_result2 = spirv_disasm.Disassemble(words.data(), words.size());
+
+  return;
+}
+
+}  // namespace gpu
+}  // namespace xe