From c8aa3652ff164572be91ada251b5e11d5baca519 Mon Sep 17 00:00:00 2001 From: Hong Date: Fri, 6 Mar 2026 17:47:50 +0800 Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=91=84=E5=83=8F=E6=9C=BA?= =?UTF-8?q?=E6=8D=95=E6=8D=89=E7=9A=84=E7=BB=9F=E4=B8=80=E5=A4=84=E7=90=86?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- Content/Levels/L_Test.umap | Bin 50418 -> 73087 bytes .../Source/CameraCaptureActor.cpp | 224 +++--------------- .../CameraCapture/Source/CameraCaptureActor.h | 49 ++-- .../Source/CameraCaptureSubSystem.h | 19 +- .../Source/CameraCaptureSubsystem.cpp | 137 +++++++++++ 5 files changed, 218 insertions(+), 211 deletions(-) diff --git a/Content/Levels/L_Test.umap b/Content/Levels/L_Test.umap index 02f915342cba4b602ff3c792e8cb9e15497c9876..0545de53d8596662c2e14dfb028028516a38b2bf 100644 GIT binary patch literal 73087 zcmeHw31C!3(r}BYc(bg6fC>tNoSB*2Q6O{XK4)?&gvrcHGRb5nnIp+W6uePb5f|?R z@B~F=R|St%Bdg+#vR-&Ao~XO1cyTO$Rln|;mwE3EGa>m_{b|VbdtKF4)!kLq)!lF2 zJaysZTYlcVckkST2{~dAAv+<*Wc{b+yzNahCEpzcW$y<+n>5jK+eaOnhu*yH zy{Y5=1ZCy3->J#X(+%sY>3Vq4R}Z%x4rS{PEj;U&e8>27Y- zFDh}a`QTr}?|yURwxd6Wvh&|K*L9D+dhqrFxC zm}UCuP}bxa@L%CWZ!Nrgg(;PxjK*4YGq07?gu+koM@ z(7*7XT%1J6DUhe9rI^wT22)D9IU_SuW63ZiXQrpr=<*0jW~VFQ^_2^LZ_wuupzmCbO@Taz*W*vJ*3lcY&*$}##`mwg zgLbsl;d8YGl8j!TP*GCfEI0z>m%M2+k42gcCXyzXWM7;&Qc_%O?{GER11_(}8uAB( zR&w{lDm<1`pFAhkAPdf10>1`x|}5E-cyTEi)cxqy=m(NUkT_uX1jw%A-duK~0)kEG3Iu(E)zvMKg39{ce?}aS%kK^NyltUy z^&>m&-wy8ul2*KHLh}&p1$|qa&)el{wFd;N5D2(Djeg?oTJ zd;gbr)5iG(yU}g;`-yM#nz?A!dY{i8Dg_|~Um!&C)^2stCPS}x8oh4l`t7rha%1-b zA{Mo_c|Fi_QekVDITVZiej$(trM`g49|F1#lng)`Wl);6CjAdq#3kAE5)TCaDzy`3f(_N_y(xCFP840_mf z@(E#>wM}ri8e9%@7aIw3`OUUpMug$EPOsJF6r4rSS3Z~BO&<7m%?9jzk#r@rTIiw; z^^-r1I&}Q;6cjbOMfNsw^k=pW*bViOQN!YK>7yne1;qxi9HYIh4aS0GPB?m=C_w=9 ztSz7q2E4W=m!n1SAo%HJ+is_wVX(Idq5#-)HgA#OZz3<8{;#V>As?gN?FhO-Y|wQd z=y_p@smSXD9n7kAnrI7vAL^93L-2(xKJY+f+_e{8F9nr&io6{{D-OXqkG|(e#jM96 z3z=4@~2PgYDl^k{UY_2w?9Ir?H(`}QCuhO)}~Z<>loygO0KGxJNX9{l*L9|?# z6L83RFXbIUhc&O!1FqHP@`RvsK>A(7cT~`J<$1usoB~=pcu$|7JWyY-o+?zH2kzUv zsH#;>g2x)Hw*~~!66|+8P(a5&&u?vmVTIlf6?*Mpk7QHum=4qzL!r6YR9DhwZx0Hj ztKsc6)DyS`j}x_>?EHDqtyBvNfd}@1d+5aXP*Q{2>u5o{DQRc`59B8`njMSj*cW;` z1z)ZJYS`8!_=G&a!EJZ6kl@SHKBR_KB={Nyb9>O$VFxw=?iu`K{G*lQ(52N=j7a$l z#~yPr?E|qKy3z`~k>^`mW_%fels1L@E{C7G!Jq$n>_gNXii7~P+T}oVcq?cA^XOgc zMXkZ2%XPQ>jcR1EHvq$9bkk|YXBB*4)#Uh7);>u4k4`jB!Q%6_8oYskx0ReV>YaSr ze_m%Ok4`=gfnSfd{1Ni7F0q0UsUWe#qYtz4Vj78=p9(RZPd~pa)34GlxmwXdqr)Uy7oLAP ztyC_6ZHQi$8*;wmpdPA57!Gy7lnz}(13QB^=yCdq|LS$y=zx_ALBD`@MXk40w9pSe zy<-$L3JQhJ?{Im8ep;V*H967nMJjf1eYrQ-*yIuXe(ayk_s@F&Q0#VJ5N3htKMr@& z?#4Sq(B*c5Hq0l7UxHH*MTyMB57#tS&{430#Et;Ytz^UlBUV#QvkGnCspSZgJKP~;T&IX55d4W&|OY@ z^-hs5b9G2>?(MHULZ?Gfa{i)v5 z=oV~EKIm63O!oSpwm-(}7TTfz9riZC2onhkaB$n&KU3kMF4roP&mN8!$geN2+ITAV zG$1g+1t-@x8co3b;q-R;$)r7bNmL^c6MT>0!|4`;05v)>*Rp_WG{9^ypW_6DT9i5S zw2icDXgLk<3@#6y;#Yoq-QUMD#+5Y0K&KFPzudKu>$aBJX!9z;Mq!ZhJd*yss`=n| z=)^(opx9&~i>()bM>U6*FaskahkSY})s;{{2%F~T#nXB)xHUpp;Ioqp@4JV#LA;IV zPGjhzXRt1mm-qrr-dZoXmJZ*Hhj9?0u+-~!(a>PMarniotlW#b0^!1`A3aNhMZl|Q zbAtPK66X&SHloRarTK#x?~%2wDU_EDqTV+Sv+yXQfw6iS?N-M{J47c z3phg=o9rGBL_MR%?))4_2%^{4Hrjp@ShR-*kXf&9+Df_dXoSs(WH9;uZ`i+KeS`jK zaJhwI43-WbGUFC>Dq$c*LJ-{g1(J3C>W8VYoF0ex$;hT}zeY2KN)Q{bSt>N*5JlQ~ zeT8$l+)@A3&w>Rih0PFK)RR{m4> zB&sz7Vb}oLUMj!>$rAv_Mob6YGL_bKH8ccKCnHOXy4<@TLV-*`)IkSnzS%b&{cgC# z?xt2A5qV?9r1>H_KRODh!G{wE`X%y3q3;gtSg@Hkm_%tL31;pmbDrP$9C|@1prVqG z)m;^y&FBRcOpO%H%Pj09g zGZvd~&UJy=`W&!ou)`Ec15vod5ru%F$?GI@&%Wu=N%3HU3>ff`^Z%AJ2ZKj*v>%Ox z2#@rPeesl-C|Oy#pd4h-L3f-;JA->N%EA_E6Nr84$W62b=shC~RS;aVM5376zI^;c zEppozCXSJ$GTAlzm%voTiWu~IoTYBNM}SC*#-K0-xnKdDneof2nTgdwwjx1Ji;Q^s z*NlmZRC6DP0YYhT&ba!8ZGvkq)8LMmoL)sG3kqSVnEZ7svd>M96FDmj^a#SaYJC9q z7szWp|EWUnbY zxDc{Hq+JiOzReB_A0TJ_cgA_tE|s8JS-9jRV;0?~$8gUq;_$ebQzGXHnV-@QR)#~X zVcpXJi$E6HkWtV5B^$jrBM1(x4ZNG+hk#z3HJiq7-9%lHNKuA>YUhEaP{|xG&dg>{ zur=%*%ig**~|gkX}u5r%0(RQEeVoexmW+XrG+7L7cpA43y!h6#~xe|i1O zlTiTR-W3wVV{~vqarS3!DC26=Ez|ae1$~WSowy=_DB+fAD{rSmYK19{N9AnZ&-(Xi z)pXFTEg^lN)hjOI#Ki)1GhGxubJgfZ+B$U{Ixrp~VDq-=A>3qsIZTF}dGaBH$D!P? 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"Engine/TextureRenderTarget2D.h" -#include "Engine/World.h" -#include "HAL/PlatformFilemanager.h" -#include "Misc/Paths.h" -#include "Misc/FileHelper.h" -#include "IImageWrapper.h" -#include "IImageWrapperModule.h" -#include "Modules/ModuleManager.h" -#include "Async/Async.h" ACameraCaptureActor::ACameraCaptureActor() { - PrimaryActorTick.bCanEverTick = true; + // PrimaryActorTick.bCanEverTick = false; } void ACameraCaptureActor::BeginPlay() @@ -24,21 +17,6 @@ void ACameraCaptureActor::BeginPlay() BuildViewCaptures(); } -void ACameraCaptureActor::Tick(float DeltaSeconds) -{ - Super::Tick(DeltaSeconds); - - if (!bCaptureEveryFrame) return; - - UpdateViewTransforms(); - CaptureViews(); - - if (bGenerateAtlas) - { - GenerateAtlas(); - } -} - #if WITH_EDITOR void ACameraCaptureActor::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) { @@ -51,59 +29,44 @@ void ACameraCaptureActor::PostEditChangeProperty(FPropertyChangedEvent& Property void ACameraCaptureActor::BuildViewCaptures() { - // Destroy old components - for (USceneCaptureComponent2D* Comp : ViewCaptures) + if (ViewCapture) { - if (Comp) - { - Comp->DestroyComponent(); - } - } - ViewCaptures.Empty(); - ViewRTs.Empty(); - AtlasRT = nullptr; - - if (ViewCount < 1) ViewCount = 1; - if (ViewWidth < 16) ViewWidth = 16; - if (ViewHeight < 16) ViewHeight = 16; - - // Recreate view captures - for (int32 i = 0; i < ViewCount; ++i) - { - UTextureRenderTarget2D* RT = NewObject(this); - RT->RenderTargetFormat = RTF_RGBA8; - RT->ClearColor = FLinearColor::Black; - RT->InitAutoFormat(ViewWidth, ViewHeight); - RT->UpdateResourceImmediate(true); - - USceneCaptureComponent2D* Capture = NewObject(this); - Capture->SetupAttachment(GetRootComponent()); - Capture->RegisterComponent(); - - Capture->TextureTarget = RT; - Capture->CaptureSource = ESceneCaptureSource::SCS_FinalColorLDR; - Capture->bCaptureEveryFrame = false; // 手动触发 - Capture->bCaptureOnMovement = false; - - ViewCaptures.Add(Capture); - ViewRTs.Add(RT); + ViewCapture->DestroyComponent(); + ViewCapture = nullptr; } - // Atlas RT (optional) - if (bGenerateAtlas) + if (ViewRT) { - if (AtlasGridX < 1) AtlasGridX = 1; - if (AtlasGridY < 1) AtlasGridY = 1; - - AtlasRT = NewObject(this); - AtlasRT->RenderTargetFormat = RTF_RGBA8; - AtlasRT->ClearColor = FLinearColor::Black; - AtlasRT->InitAutoFormat(ViewWidth * AtlasGridX, ViewHeight * AtlasGridY); - AtlasRT->UpdateResourceImmediate(true); + ViewRT = nullptr; } + + ViewRT = NewObject(this); + ViewRT->ClearColor = FLinearColor::Black; + ViewRT->InitAutoFormat(ViewWidth, ViewHeight); + ViewRT->UpdateResourceImmediate(true); + + ViewCapture = NewObject(this, TEXT("ViewCapture")); + ViewCapture->SetupAttachment(GetRootComponent()); + ViewCapture->RegisterComponent(); + + ViewCapture->TextureTarget = ViewRT; + ViewCapture->CaptureSource = ESceneCaptureSource::SCS_FinalColorHDR; + ViewCapture->bCaptureEveryFrame = false; + ViewCapture->bCaptureOnMovement = false; + + ViewCapture->PostProcessBlendWeight = 1.0f; + + ViewCapture->PostProcessSettings.bOverride_AutoExposureMethod = true; + ViewCapture->PostProcessSettings.AutoExposureMethod = EAutoExposureMethod::AEM_Manual; + + ViewCapture->PostProcessSettings.bOverride_AutoExposureBias = true; + ViewCapture->PostProcessSettings.AutoExposureBias = 1.0f; + + ViewCapture->SetRelativeLocation(FVector::ZeroVector); + ViewCapture->SetRelativeRotation(FRotator::ZeroRotator); } -void ACameraCaptureActor::UpdateViewTransforms() +void ACameraCaptureActor::UpdateViewTransforms(const int32 Index) { // 以本 Actor（CameraActor）的 transform 为中心 const FVector Center = GetActorLocation(); @@ -117,129 +80,18 @@ void ACameraCaptureActor::UpdateViewTransforms() FOV = Cam->FieldOfView; } - for (int32 i = 0; i < ViewCaptures.Num(); ++i) + if (ViewCapture) { - if (!ViewCaptures[i]) continue; - // 线性水平分布：居中对称 - const float Offset = (i - (ViewCount - 1) * 0.5f) * Baseline; + const float Offset = (Index - (ViewCount - 1) * 0.5f) * Baseline; const FVector Pos = Center + Right * Offset; - ViewCaptures[i]->SetWorldLocationAndRotation(Pos, Rot); - ViewCaptures[i]->FOVAngle = FOV; + ViewCapture->SetWorldLocationAndRotation(Pos, Rot); + ViewCapture->FOVAngle = FOV; } } void ACameraCaptureActor::CaptureViews() { - for (USceneCaptureComponent2D* Capture : ViewCaptures) - { - if (Capture) - { - Capture->CaptureScene(); - } - } + ViewCapture->CaptureScene(); } - -static void FlipVertical(TArray& Pixels, int32 W, int32 H) -{ - for (int32 Row = 0; Row < H / 2; ++Row) - { - const int32 A = Row * W; - const int32 B = (H - 1 - Row) * W; - for (int32 Col = 0; Col < W; ++Col) - { - Swap(Pixels[A + Col], Pixels[B + Col]); - } - } -} - -void ACameraCaptureActor::GenerateAtlas() -{ - if (!AtlasRT) return; - - // 这里做一个“可编译的基础版”：CPU 拼合 AtlasPixels，并（可选）保存到磁盘 - // 注意：把像素写回 AtlasRT 需要更底层的 RHI/渲染线程操作；高性能版我建议改成 GPU Blit。 - const int32 AtlasW = AtlasRT->SizeX; - const int32 AtlasH = AtlasRT->SizeY; - - TArray AtlasPixels; - AtlasPixels.SetNumZeroed(AtlasW * AtlasH); - - const int32 MaxViews = FMath::Min(ViewCount, AtlasGridX * AtlasGridY); - - for (int32 i = 0; i < MaxViews; ++i) - { - UTextureRenderTarget2D* RT = ViewRTs.IsValidIndex(i) ? ViewRTs[i] : nullptr; - if (!RT) continue; - - FTextureRenderTargetResource* Res = RT->GameThread_GetRenderTargetResource(); - if (!Res) continue; - - TArray Pixels; - Pixels.SetNumUninitialized(ViewWidth * ViewHeight); - - FReadSurfaceDataFlags ReadFlags(RCM_UNorm); - ReadFlags.SetLinearToGamma(true); - - if (!Res->ReadPixels(Pixels, ReadFlags)) continue; - FlipVertical(Pixels, ViewWidth, ViewHeight); - - const int32 GX = i % AtlasGridX; - const int32 GY = i / AtlasGridX; - - const int32 DstX0 = GX * ViewWidth; - const int32 DstY0 = GY * ViewHeight; - - for (int32 y = 0; y < ViewHeight; ++y) - { - const int32 DstY = DstY0 + y; - if (DstY < 0 || DstY >= AtlasH) continue; - - const int32 SrcRow = y * ViewWidth; - const int32 DstRow = DstY * AtlasW; - - for (int32 x = 0; x < ViewWidth; ++x) - { - const int32 DstX = DstX0 + x; - if (DstX < 0 || DstX >= AtlasW) continue; - - AtlasPixels[DstRow + DstX] = Pixels[SrcRow + x]; - } - } - } - - // ✅ 如果你需要“输出到目录”，这里就直接把 AtlasPixels 编码写盘 - // （你也可以加开关：bDumpAtlasToDisk） - const FString OutDir = FPaths::Combine(FPaths::ProjectSavedDir(), TEXT("CameraCapture")); - IPlatformFile& PF = FPlatformFileManager::Get().GetPlatformFile(); - if (!PF.DirectoryExists(*OutDir)) PF.CreateDirectoryTree(*OutDir); - - const FString FullPath = FPaths::Combine( - OutDir, - FString::Printf(TEXT("atlas_%010lld.png"), (int64)GFrameCounter) - ); - - auto EncodeAndWrite = [AtlasPixels = MoveTemp(AtlasPixels), AtlasW, AtlasH, FullPath]() - { - IImageWrapperModule& ImageWrapperModule = - FModuleManager::LoadModuleChecked(TEXT("ImageWrapper")); - - TSharedPtr Wrapper = ImageWrapperModule.CreateImageWrapper(EImageFormat::PNG); - if (!Wrapper.IsValid()) return; - - if (!Wrapper->SetRaw(AtlasPixels.GetData(), AtlasPixels.Num() * sizeof(FColor), - AtlasW, AtlasH, ERGBFormat::BGRA, 8)) - { - return; - } - - const TArray64& Compressed = Wrapper->GetCompressed(); - TArray Bytes; - Bytes.Append(Compressed.GetData(), (int32)Compressed.Num()); - FFileHelper::SaveArrayToFile(Bytes, *FullPath); - }; - - // 基础版默认异步写盘，避免卡 - Async(EAsyncExecution::ThreadPool, MoveTemp(EncodeAndWrite)); -} \ No newline at end of file diff --git a/Plugins/CameraCapture/Source/CameraCaptureActor.h b/Plugins/CameraCapture/Source/CameraCaptureActor.h index 781a9a4..3504b83 100644 --- a/Plugins/CameraCapture/Source/CameraCaptureActor.h +++ b/Plugins/CameraCapture/Source/CameraCaptureActor.h @@ -4,6 +4,17 @@ #include "Camera/CameraActor.h" #include "CameraCaptureActor.generated.h" + +#define CAMERA_WIDTH_NUMS 3 +#define CAMERA_HEIGHTH_NUMS 3 + +const int32 AtlasGridX = 3; +const int32 AtlasGridY = 3; +const int32 ViewWidth = 1024; +const int32 ViewHeight = 1024; + + + UENUM(BlueprintType) enum class EViewDistribution : uint8 { @@ -11,6 +22,12 @@ enum class EViewDistribution : uint8 Circular UMETA(DisplayName = "Circular") }; + +class USceneCaptureComponent2D; +class UTextureRenderTarget2D; + + + UCLASS() class CAMERACAPTURE_API ACameraCaptureActor : public ACameraActor { @@ -19,6 +36,10 @@ class CAMERACAPTURE_API ACameraCaptureActor : public ACameraActor public: ACameraCaptureActor(); + USceneCaptureComponent2D* GetViewCapture() { return ViewCapture; } + UTextureRenderTarget2D* GetViewRT() { return ViewRT; } + + // ===== 多视图参数 ===== UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MultiView") @@ -30,28 +51,11 @@ public: UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MultiView") EViewDistribution Distribution = EViewDistribution::LinearHorizontal; - UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MultiView") - int32 ViewWidth = 1024; - - UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MultiView") - int32 ViewHeight = 1024; - UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MultiView") bool bCaptureEveryFrame = true; - // Atlas - UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Atlas") - bool bGenerateAtlas = true; - - UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Atlas") - int32 AtlasGridX = 3; - - UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Atlas") - int32 AtlasGridY = 3; - protected: virtual void BeginPlay() override; - virtual void Tick(float DeltaSeconds) override; #if WITH_EDITOR virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override; @@ -62,18 +66,15 @@ protected: private: void BuildViewCaptures(); - void UpdateViewTransforms(); + void UpdateViewTransforms(const int32 Index); void CaptureViews(); - void GenerateAtlas(); private: - UPROPERTY(Transient) - TArray ViewCaptures; + UPROPERTY(VisibleAnywhere, BlueprintReadOnly, meta = (AllowPrivateAccess = "true")) + TObjectPtr ViewCapture; UPROPERTY(Transient) - TArray ViewRTs; + TObjectPtr ViewRT; - UPROPERTY(Transient) - class UTextureRenderTarget2D* AtlasRT; }; \ No newline at end of file diff --git a/Plugins/CameraCapture/Source/CameraCaptureSubSystem.h b/Plugins/CameraCapture/Source/CameraCaptureSubSystem.h index 053bbc6..fb2a486 100644 --- a/Plugins/CameraCapture/Source/CameraCaptureSubSystem.h +++ b/Plugins/CameraCapture/Source/CameraCaptureSubSystem.h @@ -4,15 +4,17 @@ #include "CoreMinimal.h" #include "Subsystems/WorldSubsystem.h" +#include "Tickable.h" #include "CameraCaptureSubSystem.generated.h" + class ACameraCaptureActor; UCLASS() -class CAMERACAPTURE_API UCameraCaptureSubSystem : public UWorldSubsystem +class CAMERACAPTURE_API UCameraCaptureSubSystem : public UWorldSubsystem, public FTickableGameObject { GENERATED_BODY() @@ -22,10 +24,25 @@ public: virtual void Deinitialize() override; virtual void OnWorldBeginPlay(UWorld& InWorld) override; + virtual void Tick(float DeltaTime) override; + + virtual TStatId GetStatId() const override; + + virtual bool IsTickable() const override + { + return true; + } private: + void CaptureViewToImageTick(); + + void AsyncWriteImageToDisk(TArray& AtlasPixels, const int32 AtlasW, const int32 AtlasH); + TArray> AllCaptureCameras; + // 输出的目录 + UPROPERTY() + FString OutPutDirectoryPath; }; diff --git a/Plugins/CameraCapture/Source/CameraCaptureSubsystem.cpp b/Plugins/CameraCapture/Source/CameraCaptureSubsystem.cpp index 1dfc81e..c5dc8db 100644 --- a/Plugins/CameraCapture/Source/CameraCaptureSubsystem.cpp +++ b/Plugins/CameraCapture/Source/CameraCaptureSubsystem.cpp @@ -2,13 +2,25 @@ #include "CameraCaptureSubSystem.h" #include "CameraCaptureActor.h" +#include "Components/SceneCaptureComponent2D.h" +#include "Camera/CameraComponent.h" #include "EngineUtils.h" +#include "Engine/World.h" +#include "Engine/TextureRenderTarget2D.h" +#include "IImageWrapper.h" +#include "IImageWrapperModule.h" +#include "HAL/PlatformFilemanager.h" +#include "Misc/Paths.h" +#include "Misc/FileHelper.h" +#include "Modules/ModuleManager.h" +#include "Async/Async.h" void UCameraCaptureSubSystem::Initialize(FSubsystemCollectionBase& Collection) { Super::Initialize(Collection); + OutPutDirectoryPath = FPaths::Combine(FPaths::ProjectSavedDir(), TEXT("CameraCapture")); } void UCameraCaptureSubSystem::Deinitialize() @@ -30,4 +42,129 @@ void UCameraCaptureSubSystem::OnWorldBeginPlay(UWorld& InWorld) } } + if (AllCaptureCameras.Num() != CAMERA_WIDTH_NUMS * CAMERA_HEIGHTH_NUMS) + { + return; + } + + +} + +static void FlipVertical(TArray& Pixels, int32 W, int32 H) +{ + for (int32 Row = 0; Row < H / 2; ++Row) + { + const int32 A = Row * W; + const int32 B = (H - 1 - Row) * W; + for (int32 Col = 0; Col < W; ++Col) + { + Swap(Pixels[A + Col], Pixels[B + Col]); + } + } +} + +void UCameraCaptureSubSystem::Tick(float DeltaTime) +{ + CaptureViewToImageTick(); + +} + +TStatId UCameraCaptureSubSystem::GetStatId() const +{ + RETURN_QUICK_DECLARE_CYCLE_STAT(UCameraCaptureSubSystem, STATGROUP_Tickables); +} + +void UCameraCaptureSubSystem::CaptureViewToImageTick() +{ + if (AllCaptureCameras.IsEmpty()) + { + return; + } + + TArray AtlasPixels; + const int32 AtlasW = ViewWidth * AtlasGridX; + const int32 AtlasH = ViewHeight * AtlasGridY; + AtlasPixels.SetNumZeroed(AtlasW * AtlasH); + + for (int32 CameraIndex = 0; CameraIndex < AllCaptureCameras.Num(); CameraIndex++) + { + if (!AllCaptureCameras[CameraIndex].IsValid()) + { + continue; + } + + UTextureRenderTarget2D* RenderTarget = AllCaptureCameras[CameraIndex]->GetViewRT(); + if (!RenderTarget) + { + continue; + } + + FTextureRenderTargetResource* RenderTargetRes = RenderTarget->GameThread_GetRenderTargetResource(); + if (!RenderTargetRes) + { + continue; + } + + TArray Pixels; + Pixels.SetNumUninitialized(ViewWidth * ViewHeight); + + FReadSurfaceDataFlags ReadFlags(RCM_UNorm); + ReadFlags.SetLinearToGamma(true); + + if (!RenderTargetRes->ReadPixels(Pixels, ReadFlags)) continue; + FlipVertical(Pixels, ViewWidth, ViewHeight); + + const int32 GX = CameraIndex % AtlasGridX; + const int32 GY = CameraIndex / AtlasGridX; + + const int32 DstX0 = GX * ViewWidth; + const int32 DstY0 = GY * ViewHeight; + + for (int32 y = 0; y < ViewHeight; ++y) + { + const int32 DstY = DstY0 + y; + if (DstY < 0 || DstY >= AtlasH) continue; + + const int32 SrcRow = y * ViewWidth; + const int32 DstRow = DstY * AtlasW; + + for (int32 x = 0; x < ViewWidth; ++x) + { + const int32 DstX = DstX0 + x; + if (DstX < 0 || DstX >= AtlasW) continue; + + AtlasPixels[DstRow + DstX] = Pixels[SrcRow + x]; + } + } + } + + AsyncWriteImageToDisk(AtlasPixels, AtlasW, AtlasH); +} + +void UCameraCaptureSubSystem::AsyncWriteImageToDisk(TArray& AtlasPixels, const int32 AtlasW, const int32 AtlasH) +{ + const FString FullPath = FPaths::Combine( OutPutDirectoryPath, FString::Printf(TEXT("atlas_%010lld.png"), (int64)GFrameCounter) ); + + auto EncodeAndWrite = [AtlasPixels = MoveTemp(AtlasPixels), AtlasW, AtlasH, FullPath]() + { + IImageWrapperModule& ImageWrapperModule = + FModuleManager::LoadModuleChecked(TEXT("ImageWrapper")); + + TSharedPtr Wrapper = ImageWrapperModule.CreateImageWrapper(EImageFormat::PNG); + if (!Wrapper.IsValid()) return; + + if (!Wrapper->SetRaw(AtlasPixels.GetData(), AtlasPixels.Num() * sizeof(FColor), + AtlasW, AtlasH, ERGBFormat::BGRA, 8)) + { + return; + } + + const TArray64& Compressed = Wrapper->GetCompressed(); + TArray Bytes; + Bytes.Append(Compressed.GetData(), (int32)Compressed.Num()); + FFileHelper::SaveArrayToFile(Bytes, *FullPath); + }; + + // 基础版默认异步写盘，避免卡 + Async(EAsyncExecution::ThreadPool, MoveTemp(EncodeAndWrite)); }