GPU/ShaderGen: Use [unroll] for resolve loops

src/core/gpu_hw_shadergen.cpp

@@ -1052,7 +1052,7 @@ float4 LoadVRAM(int2 coords)
 {
 #if MULTISAMPLING
   float4 value = LOAD_TEXTURE_MS(samp0, coords, 0u);
-  for (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
+  FOR_UNROLL (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
     value += LOAD_TEXTURE_MS(samp0, coords, sample_index);
   value /= float(MULTISAMPLES);
   return value;
@@ -1156,7 +1156,7 @@ float4 LoadVRAM(int2 coords)
 {
 #if MULTISAMPLING
   float4 value = LOAD_TEXTURE_MS(samp0, coords, 0u);
-  for (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
+  FOR_UNROLL (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
     value += LOAD_TEXTURE_MS(samp0, coords, sample_index);
   value /= float(MULTISAMPLES);
   return value;

src/core/shader_cache_version.h

@@ -1,4 +1,4 @@
 #pragma once
 #include "types.h"
 
-static constexpr u32 SHADER_CACHE_VERSION = 5;
+static constexpr u32 SHADER_CACHE_VERSION = 6;

src/core/shadergen.cpp

@@ -173,6 +173,10 @@ void ShaderGen::WriteHeader(std::stringstream& ss)
 
     ss << "#define CONSTANT const\n";
     ss << "#define GLOBAL\n";
+    ss << "#define FOR_UNROLL for\n";
+    ss << "#define FOR_LOOP for\n";
+    ss << "#define IF_BRANCH if\n";
+    ss << "#define IF_FLATTEN if\n";
     ss << "#define VECTOR_EQ(a, b) ((a) == (b))\n";
     ss << "#define VECTOR_NEQ(a, b) ((a) != (b))\n";
     ss << "#define VECTOR_COMP_EQ(a, b) equal((a), (b))\n";
@@ -214,6 +218,10 @@ void ShaderGen::WriteHeader(std::stringstream& ss)
     ss << "#define mat4 float4x4\n";
     ss << "#define CONSTANT static const\n";
     ss << "#define GLOBAL static\n";
+    ss << "#define FOR_UNROLL [unroll] for\n";
+    ss << "#define FOR_LOOP [loop] for\n";
+    ss << "#define IF_BRANCH [branch] if\n";
+    ss << "#define IF_FLATTEN [flatten] if\n";
     ss << "#define VECTOR_EQ(a, b) (all((a) == (b)))\n";
     ss << "#define VECTOR_NEQ(a, b) (any((a) != (b)))\n";
     ss << "#define VECTOR_COMP_EQ(a, b) ((a) == (b))\n";