Apply half pixel offset in the vertex shader. (#16)

Author: blueskythlikesclouds

XenosRecomp/shader_common.h

@@ -28,7 +28,8 @@ struct PushConstants
 
 #define g_Booleans                 vk::RawBufferLoad<uint>(g_PushConstants.SharedConstants + 256)
 #define g_SwappedTexcoords         vk::RawBufferLoad<uint>(g_PushConstants.SharedConstants + 260)
-#define g_AlphaThreshold           vk::RawBufferLoad<float>(g_PushConstants.SharedConstants + 264)
+#define g_HalfPixelOffset          vk::RawBufferLoad<float2>(g_PushConstants.SharedConstants + 264)
+#define g_AlphaThreshold           vk::RawBufferLoad<float>(g_PushConstants.SharedConstants + 272)
 
 [[vk::constant_id(0)]] const uint g_SpecConstants = 0;
 
@@ -39,7 +40,8 @@ struct PushConstants
 #define DEFINE_SHARED_CONSTANTS() \
     uint g_Booleans : packoffset(c16.x); \
     uint g_SwappedTexcoords : packoffset(c16.y); \
-    float g_AlphaThreshold : packoffset(c16.z) \
+    float2 g_HalfPixelOffset : packoffset(c16.z); \
+    float g_AlphaThreshold : packoffset(c17.x);
 
 uint g_SpecConstants();
 

XenosRecomp/shader_recompiler.cpp

@@ -1826,6 +1826,10 @@ void ShaderRecompiler::recompile(const uint8_t* shaderData, const std::string_vi
                     out += '}';
                 #endif
                 }
+                else
+                {
+                    out += "\toPos.xy += g_HalfPixelOffset * oPos.w;\n";
+                }
 
                 if (simpleControlFlow)
                 {