shader: Add support for native 16-bit floats

src/shader_recompiler/CMakeLists.txt

@@ -211,6 +211,7 @@ add_library(shader_recompiler STATIC
     frontend/maxwell/translate/translate.h
     frontend/maxwell/translate_program.cpp
     frontend/maxwell/translate_program.h
+    host_translate_info.h
     ir_opt/collect_shader_info_pass.cpp
     ir_opt/constant_propagation_pass.cpp
     ir_opt/dead_code_elimination_pass.cpp

src/shader_recompiler/frontend/maxwell/translate_program.cpp

@@ -13,6 +13,7 @@
 #include "shader_recompiler/frontend/maxwell/structured_control_flow.h"
 #include "shader_recompiler/frontend/maxwell/translate/translate.h"
 #include "shader_recompiler/frontend/maxwell/translate_program.h"
+#include "shader_recompiler/host_translate_info.h"
 #include "shader_recompiler/ir_opt/passes.h"
 
 namespace Shader::Maxwell {
@@ -120,7 +121,7 @@ void AddNVNStorageBuffers(IR::Program& program) {
 } // Anonymous namespace
 
 IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Block>& block_pool,
-                             Environment& env, Flow::CFG& cfg) {
+                             Environment& env, Flow::CFG& cfg, const HostTranslateInfo& host_info) {
     IR::Program program;
     program.syntax_list = BuildASL(inst_pool, block_pool, env, cfg);
     program.blocks = GenerateBlocks(program.syntax_list);
@@ -150,8 +151,9 @@ IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Blo
     RemoveUnreachableBlocks(program);
 
     // Replace instructions before the SSA rewrite
-    Optimization::LowerFp16ToFp32(program);
-
+    if (!host_info.support_float16) {
+        Optimization::LowerFp16ToFp32(program);
+    }
     Optimization::SsaRewritePass(program);
 
     Optimization::GlobalMemoryToStorageBufferPass(program);

src/shader_recompiler/frontend/maxwell/translate_program.h

@@ -8,13 +8,14 @@
 #include "shader_recompiler/frontend/ir/basic_block.h"
 #include "shader_recompiler/frontend/ir/program.h"
 #include "shader_recompiler/frontend/maxwell/control_flow.h"
+#include "shader_recompiler/host_translate_info.h"
 #include "shader_recompiler/object_pool.h"
 
 namespace Shader::Maxwell {
 
 [[nodiscard]] IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool,
                                            ObjectPool<IR::Block>& block_pool, Environment& env,
-                                           Flow::CFG& cfg);
+                                           Flow::CFG& cfg, const HostTranslateInfo& host_info);
 
 [[nodiscard]] IR::Program MergeDualVertexPrograms(IR::Program& vertex_a, IR::Program& vertex_b,
                                                   Environment& env_vertex_b);

src/shader_recompiler/host_translate_info.h

@@ -0,0 +1,18 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace Shader {
+
+// Try to keep entries here to a minimum
+// They can accidentally change the cached information in a shader
+
+/// Misc information about the host
+struct HostTranslateInfo {
+    bool support_float16{}; ///< True when the device supports 16-bit floats
+    bool support_int64{};   ///< True when the device supports 64-bit integers
+};
+
+} // namespace Shader