16101301（MaterialLOD QualitySwitch）

【目标】

MaterialLOD QualitySwitch

【思路】

1 QualitySwitch

UE4有三挡

UE3

2 现在UE3需要添加三挡

3

UE3

class UMaterialExpressionQualitySwitch : public UMaterialExpression

{

public:

    //## BEGIN PROPS MaterialExpressionQualitySwitch

    FExpressionInput High;

    FExpressionInput Low;

4

【步骤】

1 修改UMaterialExpressionQualitySwitch 

\ue3\Development\Src\Engine\Classes\MaterialExpressionQualitySwitch.uc

var ExpressionInput High;

var ExpressionInput Mid;

var ExpressionInput Low;

2 修改EMaterialShaderQuality 添加中级

enum EMaterialShaderQuality

{

    MSQ_HIGH                =0,

    MSQ_MID                    =1,

    MSQ_LOW                 =2,

    MSQ_MAX                 =3,

    // Terrain only supports high quality

    MSQ_TERRAIN                =MSQ_HIGH,

    // Use an invalid value for default value to functions when not specifying a quality

    MSQ_UNSPECIFIED            =MSQ_MAX,

};

3 修改\ue3\Development\Src\Engine\Classes\Material.uc

var const native duplicatetransient pointer MaterialResources[3]{FMaterialResource};

修改UMaterial.MaterialResources 相关的

4 UMaterial.Serialize中有序列化的东西

还是要添加个版本号

EUnrealEngineObjectVersion

    // - Add MaterialShaderQuality Mid

    VER_UNIFORM_EXPRESSIONS_IN_SHADER_CACHE                = 872,

UMaterial.Serialize

            if (

                QualityIndex < 2 ||                    // MaterialResources's old size is 2

                (QualityIndex >=2 && Ar.Ver() >= VER_ADD_EXPRESSIONS_SHADERQUALITY_MID) 

                ) 

            {

                // Serialize the material resource.

                MaterialResources[QualityIndex]->Serialize(Ar);

                if (Ar.Ver() < VER_UNIFORM_EXPRESSIONS_IN_SHADER_CACHE)

                {

                    // If we are loading a material resource saved before texture references were managed by the material resource,

                    // Pass the legacy texture references to the material resource.

                    MaterialResources[QualityIndex]->AddLegacyTextures(ReferencedTextures_DEPRECATED);

                    // Empty legacy texture references on load

                    ReferencedTextures_DEPRECATED.Empty();

                }            

            }

4 修改MSQ_MAX  相关的

UMaterialInstance.StaticPermutationResources

UMaterialInstance.StaticParameters

\ue3\Development\Src\Engine\Classes\MaterialInstance.uc 改成3个

/**

* The set of static parameters that this instance will be compiled with.

* This is indexed by EMaterialShaderPlatform.

* Only the first entry is ever used now that SM2 is no longer supported,

* But the member is kept as an array to make adding future material platforms easier.

* The second entry is to work around the script compile error from having an array with one element.

*/

var const native duplicatetransient pointer StaticParameters[3]{FStaticParameterSet};

/**

* The material resources for this instance.

* This is indexed by EMaterialShaderPlatform.

* Only the first entry is ever used now that SM2 is no longer supported,

* But the member is kept as an array to make adding future material platforms easier.

* The second entry is to work around the script compile error from having an array with one element.

*/

var const native duplicatetransient pointer StaticPermutationResources[3]{FMaterialResource};

上面直接改uc数组大小的方式 貌似会有问题，序列化会出问题

make报错

手动改h文件 编译exe 再修改uc，make

5 修改FSystemSettings.bAllowHighQualityMaterials 相关

添加一个新的成员

    /** Materials Quality Level    */

    INT        QualityMaterialsLevel;

     /** Materials Quality Level    */

    { SST_INT, SSI_SCALABILITY, TEXT( "QualityMaterialsLevel" ), &GSystemSettings.QualityMaterialsLevel, &VSSMaterilQuality, TEXT( "Materials Quality Level." ) },

FSystemSettings.ApplySettings

    // Reattach components if world-detail settings have changed.

    if( OldSystemSettings.DetailMode != DetailMode || 

        OldSystemSettings.bAllowHighQualityMaterials != bAllowHighQualityMaterials ||

        OldSystemSettings.QualityMaterialsLevel != QualityMaterialsLevel)

    {

在BaseSystemSettings.ini配置

QualityMaterialsLevel=0

ExampleSystemSettings.ini同理

6 UMaterialInterface.GetDesiredQualityLevel 

        Quality = GSystemSettings.bAllowHighQualityMaterials ? MSQ_HIGH : MSQ_LOW;

改为

         Quality = EMaterialShaderQuality(GSystemSettings.QualityMaterialsLevel);

FMaterial.CacheShaders

    if (Quality == MSQ_UNSPECIFIED)

    {

        Quality = GSystemSettings.bAllowHighQualityMaterials ? MSQ_HIGH : MSQ_LOW;

    }

改为

     if (Quality == MSQ_UNSPECIFIED)

    {

        Quality = EMaterialShaderQuality(GSystemSettings.QualityMaterialsLevel);

    }

7 修改Material切换按钮响应

void WxEditorFrame::MenuMaterialQualityToggle( wxCommandEvent& In )

{

    // to be safe, we wait until rendering thread is complete

    FlushRenderingCommands();

    // toggle the system setting, mimicing what the console command does - it would be nice

    // if system settings had a function interface instead of console commands

//    GSystemSettings.bAllowHighQualityMaterials ^= 1;

    

    GSystemSettings.QualityMaterialsLevel ++;

    if (GSystemSettings.QualityMaterialsLevel >= EMaterialShaderQuality::MSQ_MAX)

        GSystemSettings.QualityMaterialsLevel = EMaterialShaderQuality::MSQ_HIGH;

8 显示出Quality值到编辑器

WxMaterialEditorBase.DrawMaterialInfoStrings.

        FLinkedObjDrawUtils::DrawShadowedString(

            Canvas,

            5,

            DrawPositionY,

            *FString::Printf(TEXT("Quality[%d] DrawCall: %d Instructions: %d DrawTime:%.6f ms"),

            GSystemSettings.QualityMaterialsLevel,

            PreviewMeshComponent->LastDrawCalls,PreviewMeshComponent->GetUsedMaterialsInstructionCounts(),PreviewMeshComponent->LastDrawTimes),

            FontToUse,

            FLinearColor(0.8,1,1)

            );

9

scale set QualityMaterialsLevel 0-2

【运行】

"/cgi-bin/micromsg-bin/auth";
"/cgi-bin/micromsg-bin/sendmsg";
"/cgi-bin/micromsg-bin/sync";
"/cgi-bin/micromsg-bin/uploadmsgimg";
"/cgi-bin/micromsg-bin/getmsgimg";
"/cgi-bin/micromsg-bin/init";
"/cgi-bin/micromsg-bin/getupdatepack";
"/cgi-bin/micromsg-bin/searchfriend";
"/cgi-bin/micromsg-bin/getinvitefriend";

3

来自为知笔记(Wiz)