unreal425_on_rpi4.patch

diff --git a/Engine/Source/Developer/Linux/LinuxTargetPlatform/Classes/LinuxTargetSettings.h b/Engine/Source/Developer/Linux/LinuxTargetPlatform/Classes/LinuxTargetSettings.h
index d8ae37eec2e..74777b463d7 100644
--- a/Engine/Source/Developer/Linux/LinuxTargetPlatform/Classes/LinuxTargetSettings.h
+++ b/Engine/Source/Developer/Linux/LinuxTargetPlatform/Classes/LinuxTargetSettings.h
@@ -45,4 +45,13 @@ public:
 	 */
 	UPROPERTY(EditAnywhere, config, Category=Rendering)
 	TArray<FString> TargetedRHIs;
+
+	UPROPERTY(EditAnywhere, config, Category = Textures, meta = (DisplayName = "Cook DXT Textures"))
+	bool bCookDXTTextures;
+	
+	UPROPERTY(EditAnywhere, config, Category = Textures, meta = (DisplayName = "Cook BC Textures"))
+	bool bCookBCTextures;
+	
+	UPROPERTY(EditAnywhere, config, Category = Textures, meta = (DisplayName = "Cook ETC2 Textures"))
+	bool bCookETC2Textures;
 };
diff --git a/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatform.h b/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatform.h
index 07564d5f5dd..22c436bf3f5 100644
--- a/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatform.h
+++ b/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatform.h
@@ -28,6 +28,13 @@
 
 class UTextureLODSettings;
 
+namespace LinuxTextureFormats
+{
+	static FName NameETC2RGB(TEXT("ETC2_RGB"));
+	static FName NameETC2RGBA(TEXT("ETC2_RGBA"));
+	static FName NameBGRA8(TEXT("BGRA8"));
+}
+
 /**
  * Template for Linux target platforms
  */
@@ -298,6 +305,55 @@ public:
 		{
 			// just use the standard texture format name for this texture
 			GetDefaultTextureFormatNamePerLayer(OutFormats.AddDefaulted_GetRef(), this, InTexture, EngineSettings, false);
+			bool bCookDXTTextures = true;
+			GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookDXTTextures"), bCookDXTTextures, GEngineIni);
+			bool bCookBCTextures = true;
+			GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookBCTextures"), bCookBCTextures, GEngineIni);
+			bool bCookETC2Textures = false;
+			GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookETC2Textures"), bCookETC2Textures, GEngineIni);
+
+			for (TArray<FName>& LayerNames : OutFormats)
+			{
+				for (int32 NameIndex = LayerNames.Num() - 1; NameIndex >= 0; NameIndex--)
+				{
+					const FString Name = LayerNames[NameIndex].ToString();
+					if (Name.Contains("DXT"))
+					{
+						if (!bCookDXTTextures)
+						{
+							if (bCookETC2Textures)
+							{
+								if (Name == "DXT1")
+								{
+									LayerNames[NameIndex] = LinuxTextureFormats::NameETC2RGB;
+								}
+								else
+								{
+									LayerNames[NameIndex] = LinuxTextureFormats::NameETC2RGBA;
+								}
+							}
+							else
+							{
+								LayerNames[NameIndex] = LinuxTextureFormats::NameBGRA8;
+							}
+						}
+					}
+					else if (Name.StartsWith("BC"))
+					{
+						if (!bCookBCTextures)
+						{
+							if (bCookETC2Textures)
+							{
+								LayerNames[NameIndex] = LinuxTextureFormats::NameETC2RGB;
+							}
+							else
+							{
+								LayerNames[NameIndex] = LinuxTextureFormats::NameBGRA8;
+							}
+						}
+					}
+				}
+			}
 		}
 	}
 
@@ -308,6 +364,54 @@ public:
 		{
 			// just use the standard texture format name for this texture
 			GetAllDefaultTextureFormats(this, OutFormats, false);
+			bool bCookDXTTextures = true;
+			GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookDXTTextures"), bCookDXTTextures, GEngineIni);
+			bool bCookBCTextures = true;
+			GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookBCTextures"), bCookBCTextures, GEngineIni);
+			bool bCookETC2Textures = false;
+			GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookETC2Textures"), bCookETC2Textures, GEngineIni);
+
+			for (int32 NameIndex = OutFormats.Num() - 1; NameIndex >= 0; NameIndex--)
+			{
+				const FString Name = OutFormats[NameIndex].ToString();
+				if (Name.Contains("DXT"))
+				{
+					if (!bCookDXTTextures)
+					{
+						if (bCookETC2Textures)
+						{
+							if (Name == "DXT1")
+							{
+								OutFormats[NameIndex] = LinuxTextureFormats::NameETC2RGB;
+							}
+							else
+							{
+								OutFormats[NameIndex] = LinuxTextureFormats::NameETC2RGBA;
+							}
+						}
+						else
+						{
+							OutFormats.RemoveAt(NameIndex);
+						}
+
+					}
+
+				}
+				else if (Name.StartsWith("BC"))
+				{
+					if (!bCookBCTextures)
+					{
+						if (bCookETC2Textures)
+						{
+							OutFormats[NameIndex] = LinuxTextureFormats::NameETC2RGB;
+						}
+						else
+						{
+							OutFormats.RemoveAt(NameIndex);
+						}
+					}
+				}
+			}
 		}
 	}
 
diff --git a/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatformModule.cpp b/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatformModule.cpp
index 9919559e3f9..9c1a8ef54bc 100644
--- a/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatformModule.cpp
+++ b/Engine/Source/Developer/Linux/LinuxTargetPlatform/Private/LinuxTargetPlatformModule.cpp
@@ -63,6 +63,21 @@ public:
 		GConfig->GetArray(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("TargetedRHIs"), TargetSettings->TargetedRHIs, GEngineIni);
 		TargetSettings->AddToRoot();
 
+		if (!GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookDXTTextures"), TargetSettings->bCookDXTTextures, GEngineIni))
+		{
+			TargetSettings->bCookDXTTextures = true;
+		}
+
+		if (!GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookBCTextures"), TargetSettings->bCookBCTextures, GEngineIni))
+		{
+			TargetSettings->bCookBCTextures = true;
+		}
+
+		if (!GConfig->GetBool(TEXT("/Script/LinuxTargetPlatform.LinuxTargetSettings"), TEXT("bCookETC2Textures"), TargetSettings->bCookETC2Textures, GEngineIni))
+		{
+			TargetSettings->bCookETC2Textures = true;
+		}
+
 		ISettingsModule* SettingsModule = FModuleManager::GetModulePtr<ISettingsModule>("Settings");
 
 		if (SettingsModule != nullptr)
diff --git a/Engine/Source/Runtime/RHI/Public/RHIDefinitions.h b/Engine/Source/Runtime/RHI/Public/RHIDefinitions.h
index cfabaf4cad2..dcd2db28efa 100644
--- a/Engine/Source/Runtime/RHI/Public/RHIDefinitions.h
+++ b/Engine/Source/Runtime/RHI/Public/RHIDefinitions.h
@@ -1149,6 +1149,7 @@ enum class EGpuVendorId
 	Arm			= 0x13B5, 
 	Qualcomm	= 0x5143,
 	Intel		= 0x8086,
+	Broadcom	= 0x14e4,
 };
 
 /** An enumeration of the different RHI reference types. */
@@ -1701,6 +1702,7 @@ inline EGpuVendorId RHIConvertToGpuVendorId(uint32 VendorId)
 	case EGpuVendorId::Arm:
 	case EGpuVendorId::Qualcomm:
 	case EGpuVendorId::Intel:
+	case EGpuVendorId::Broadcom:
 		return (EGpuVendorId)VendorId;
 
 	default:
diff --git a/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.cpp b/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.cpp
index a59cc03e545..31c283fe6e6 100644
--- a/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.cpp
+++ b/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.cpp
@@ -18,6 +18,9 @@ static bool GForceEnableDebugMarkers = false;
 
 void* FVulkanLinuxPlatform::VulkanLib = nullptr;
 bool FVulkanLinuxPlatform::bAttemptedLoad = false;
+bool FVulkanLinuxPlatform::bHasBCTextures = true;
+bool FVulkanLinuxPlatform::bHasASTCTextures = false;
+
 
 bool FVulkanLinuxPlatform::IsSupported()
 {
@@ -236,3 +239,13 @@ void FVulkanLinuxPlatform::WriteCrashMarker(const FOptionalVulkanDeviceExtension
 		}
 	}
 }
+
+void FVulkanLinuxPlatform::CheckDeviceDriver(uint32 DeviceIndex, EGpuVendorId VendorId, const VkPhysicalDeviceProperties& Props)
+{
+	// RPI4B does not support BC Textures
+	if (VendorId == EGpuVendorId::Broadcom)
+	{
+		bHasBCTextures = false;
+		bHasASTCTextures = true;
+	}
+}
diff --git a/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.h b/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.h
index 54396cec143..54e24005edc 100644
--- a/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.h
+++ b/Engine/Source/Runtime/VulkanRHI/Private/Linux/VulkanLinuxPlatform.h
@@ -34,6 +34,10 @@ class FVulkanLinuxPlatform : public FVulkanGenericPlatform
 public:
 	static bool IsSupported();
 
+	static void CheckDeviceDriver(uint32 DeviceIndex, EGpuVendorId VendorId, const VkPhysicalDeviceProperties& Props);
+	static bool SupportsBCTextureFormats() { return bHasBCTextures; }
+	static bool SupportsASTCTextureFormats() { return bHasASTCTextures; }
+
 	static bool LoadVulkanLibrary();
 	static bool LoadVulkanInstanceFunctions(VkInstance inInstance);
 	static void FreeVulkanLibrary();
@@ -72,6 +76,8 @@ public:
 protected:
 	static void* VulkanLib;
 	static bool bAttemptedLoad;
+	static bool bHasBCTextures;
+	static bool bHasASTCTextures;
 };
 
 typedef FVulkanLinuxPlatform FVulkanPlatform;