VideoCommon: Add an option to disable mipmaps

Needed by M1 fifoci to work around a minor non-determinism bug

Source/Core/Core/Config/GraphicsSettings.cpp

@@ -153,6 +153,9 @@ const Info<u32> GFX_HACK_MISSING_COLOR_VALUE{{System::GFX, "Hacks", "MissingColo
                                              0xFFFFFFFF};
 const Info<bool> GFX_HACK_FAST_TEXTURE_SAMPLING{{System::GFX, "Hacks", "FastTextureSampling"},
                                                 true};
+#ifdef __APPLE__
+const Info<bool> GFX_HACK_NO_MIPMAPPING{{System::GFX, "Hacks", "NoMipmapping"}, false};
+#endif
 
 // Graphics.GameSpecific
 

Source/Core/Core/Config/GraphicsSettings.h

@@ -129,6 +129,9 @@ extern const Info<bool> GFX_HACK_EFB_EMULATE_FORMAT_CHANGES;
 extern const Info<bool> GFX_HACK_VERTEX_ROUNDING;
 extern const Info<u32> GFX_HACK_MISSING_COLOR_VALUE;
 extern const Info<bool> GFX_HACK_FAST_TEXTURE_SAMPLING;
+#ifdef __APPLE__
+extern const Info<bool> GFX_HACK_NO_MIPMAPPING;
+#endif
 
 // Graphics.GameSpecific
 

Source/Core/VideoCommon/TextureCacheBase.cpp

@@ -1544,8 +1544,15 @@ TextureCacheBase::GetTexture(const int textureCacheSafetyColorSampleSize,
     }
   }
 
+#ifdef __APPLE__
+  const bool no_mips = g_ActiveConfig.bNoMipmapping;
+#else
+  const bool no_mips = false;
+#endif
   // how many levels the allocated texture shall have
-  const u32 texLevels = hires_tex ? (u32)hires_tex->m_levels.size() : texture_info.GetLevelCount();
+  const u32 texLevels = no_mips   ? 1 :
+                        hires_tex ? (u32)hires_tex->m_levels.size() :
+                                    texture_info.GetLevelCount();
 
   // We can decode on the GPU if it is a supported format and the flag is enabled.
   // Currently we don't decode RGBA8 textures from TMEM, as that would require copying from both

Source/Core/VideoCommon/VideoConfig.cpp

@@ -140,6 +140,9 @@ void VideoConfig::Refresh()
   iEFBAccessTileSize = Config::Get(Config::GFX_HACK_EFB_ACCESS_TILE_SIZE);
   iMissingColorValue = Config::Get(Config::GFX_HACK_MISSING_COLOR_VALUE);
   bFastTextureSampling = Config::Get(Config::GFX_HACK_FAST_TEXTURE_SAMPLING);
+#ifdef __APPLE__
+  bNoMipmapping = Config::Get(Config::GFX_HACK_NO_MIPMAPPING);
+#endif
 
   bPerfQueriesEnable = Config::Get(Config::GFX_PERF_QUERIES_ENABLE);
 

Source/Core/VideoCommon/VideoConfig.h

@@ -143,6 +143,9 @@ struct VideoConfig final
   int iSaveTargetId = 0;  // TODO: Should be dropped
   u32 iMissingColorValue = 0;
   bool bFastTextureSampling = false;
+#ifdef __APPLE__
+  bool bNoMipmapping = false;  // Used by macOS fifoci to work around an M1 bug
+#endif
 
   // Stereoscopy
   StereoMode stereo_mode{};