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UnrealEngineUWP/Engine/Source/Editor/MaterialEditor/Private/MaterialEditorActions.cpp
ben ingram 0bb0a923a0 Merging Dev-LWCRendering into Main, this includes initial work to support rendering with LWC-scale position 
Basic approach is to add HLSL types FLWCScalar, FLWCMatrix, FLWCVector, etc.  Inside shaders, absolute world space position values should be represented as FLWCVector3.  Matrices that transform *into* absolute world space become FLWCMatrix.  Matrices that transform *from* world space become FLWCInverseMatrix.  Generally LWC values work by extending the regular 'float' value with an additional tile coordinate.  Final tile size will be a trade-off between scale/accuracy; I'm using 256k for now, but may need to be adjusted.  Value represented by a FLWCVector thus becomes V.Tile * TileSize + V.Offset.  Most operations can be performed directly on LWC values.  There are HLSL functions like LWCAdd, LWCSub, LWCMultiply, LWCDivide (operator overloading would be really nice here).  The goal is to stay with LWC values for as long as needed, then convert to regular float values when possible.  One thing that comes up a lot is working in translated (rather than absolute) world space.  WorldSpace + View.PrevPreViewTranslation = TranslatedWorldspace.  Except 'View.PrevPreViewTranslation' is now a FLWCVector3, and WorldSpace quantities should be as well.  So that becomes LWCAdd(WorldSpace, View.PrevPreViewTranslation) = TranslatedWorldspace.  Assuming that we're talking about a position that's "reasonably close" to the camera, it should be safe to convert the translated WS value to float.  The 'tile' coordinate of the 2 LWC values should cancel out when added together in this case.  I've done some work throughout the shader code to do this.  Materials are fully supporting LWC-values as well.  Projective texturing and vertex animation materials that I've tested work correctly even when positioned "far away" from the origin.

Lots of work remains to fully convert all of our shader code.  There's a function LWCHackToFloat(), which is a simple wrapper for LWCToFloat().  The idea of HackToFloat is to mark places that need further attention, where I'm simply converting absolute WS positions to float, to get shaders to compile.  Shaders converted in this way should continue to work for all existing content (without LWC-scale values), but they will break if positions get too large.

General overview of changed files:
LargeWorldCoordinates.ush - This defines the FLWC types and operations
GPUScene.cpp, SceneData.ush - Primitives add an extra 'float3' tile coordinate.  Instance data is unchanged, so instances need to stay within single-precision range of the primitive origin.  Could potentially split instances behind the scenes (I think) if we don't want this limitation
HLSLMaterialDerivativeAutogen.cpp, HLSLMaterialTranslator.cpp, Preshader.cpp - Translated materials to use LWC values
SceneView.cpp, SceneRelativeViewMatrices.cpp, ShaderCompiler.cpp, InstancedStereo.ush - View uniform buffer includes LWC values where appropriate
#jira UE-117101
#rb arne.schober, Michael.Galetzka

#ROBOMERGE-AUTHOR: ben.ingram
#ROBOMERGE-SOURCE: CL 17787435 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v881-17767770)

[CL 17787478 by ben ingram in ue5-release-engine-test branch]
2021-10-12 13:31:00 -04:00

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// Copyright Epic Games, Inc. All Rights Reserved.
#include "MaterialEditorActions.h"
#include "Misc/ConfigCacheIni.h"
#include "Materials/MaterialExpression.h"
#include "MaterialGraph/MaterialGraphSchema.h"
#include "Materials/MaterialExpressionComment.h"
#define LOCTEXT_NAMESPACE "MaterialEditorCommands"
void FMaterialEditorCommands::RegisterCommands()
{
UI_COMMAND( Apply, "Apply", "Apply changes to original material and its use in the world.", EUserInterfaceActionType::Button, FInputChord());
UI_COMMAND( Flatten, "Flatten", "Flatten the material to a texture for mobile devices.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ShowAllMaterialParameters, "Show Inactive", "Show the material instance parameters currently hidden behind static switches.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( SetCylinderPreview, "Cylinder", "Sets the preview mesh to a cylinder primitive.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( SetSpherePreview, "Sphere", "Sets the preview mesh to a sphere primitive.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( SetPlanePreview, "Plane", "Sets the preview mesh to a plane primitive.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( SetCubePreview, "Cube", "Sets the preview mesh to a cube primitive.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( SetPreviewMeshFromSelection, "Mesh", "Sets the preview mesh based on the current content browser selection.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( TogglePreviewGrid, "Grid", "Toggles the preview pane's grid.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( TogglePreviewBackground, "Background", "Toggles the preview pane's background.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( CameraHome, "Home", "Goes home on the canvas.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( CleanUnusedExpressions, "Clean Up", "Cleans up any unused Expressions.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ShowHideConnectors, "Hide Unused Connectors", "Hide unused connectors to clean up the graph view.", EUserInterfaceActionType::ToggleButton, FInputChord());
UI_COMMAND( ToggleLivePreview, "Preview Material", "Toggles real time update of the preview material.", EUserInterfaceActionType::ToggleButton, FInputChord());
UI_COMMAND( ToggleRealtimeExpressions, "Realtime Nodes", "Nodes impacted by time-based functions such as panners, etc. will update realtime.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( AlwaysRefreshAllPreviews, "All Node Previews", "All node previews are updated upon any change to the graph.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( ToggleMaterialStats, "Stats", "Toggles displaying of the material's stats.", EUserInterfaceActionType::ToggleButton, FInputChord());
UI_COMMAND( TogglePlatformStats, "Platform Stats", "Toggles the window that shows material stats and compilation errors for multiple platforms.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( ToggleHideUnrelatedNodes, "Hide Unrelated", "Toggles hiding nodes which are unrelated to the selected nodes automatically.", EUserInterfaceActionType::ToggleButton, FInputChord() );
UI_COMMAND( NewComment, "New Comment", "Creates a new comment node.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( MatertialPasteHere, "Paste Here", "Pastes copied items at this location.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( UseCurrentTexture, "Use Current Texture", "Uses the current texture selected in the content browser.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ConvertObjects, "Convert to Parameter", "Converts the objects to parameters.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( PromoteToDouble, "Promote to Double", "Converts the parameters to double precision.", EUserInterfaceActionType::Button, FInputChord());
UI_COMMAND( PromoteToFloat, "Promote to Float", "Converts the parameters to float precision.", EUserInterfaceActionType::Button, FInputChord());
UI_COMMAND( ConvertToConstant, "Convert to Constant", "Converts the parameters to constants.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( SelectNamedRerouteDeclaration, "Select Named Reroute Declaration", "Select this named reroute's declaration node.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( SelectNamedRerouteUsages, "Select Named Reroute Usages", "Select this named reroute's usage nodes.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ConvertRerouteToNamedReroute, "Convert to Named Reroute", "Replace this reroute with a named reroute.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ConvertNamedRerouteToReroute, "Convert to Reroute", "Replace this named reroute with an (unnamed) reroute node.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ConvertToTextureObjects, "Convert to Texture Object", "Converts the objects to texture objects.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ConvertToTextureSamples, "Convert to Texture Sample", "Converts the objects to texture samples.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( StopPreviewNode, "Stop Previewing Node", "Stops the preview viewport from previewing this node", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( StartPreviewNode, "Start Previewing Node", "Makes the preview viewport start previewing this node", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( EnableRealtimePreviewNode, "Enable Realtime Preview", "Enables realtime previewing of this expression node", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( DisableRealtimePreviewNode, "Disable Realtime Preview", "Disables realtime previewing of this expression node", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( BreakAllLinks, "Break All Links", "Breaks all links leading out of this node.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( DuplicateObjects, "Duplicate Object(s)", "Duplicates the selected objects.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( DeleteObjects, "Delete Object(s)", "Deletes the selected objects.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( SelectDownstreamNodes, "Select Downstream Nodes", "Selects all nodes that use this node's outgoing links.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( SelectUpstreamNodes, "Select Upstream Nodes", "Selects all nodes that feed links into this node.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( RemoveFromFavorites, "Remove From Favorites", "Removes this expression from your favorites.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( AddToFavorites, "Add To Favorites", "Adds this expression to your favorites.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( BreakLink, "Break Link", "Deletes this link.", EUserInterfaceActionType::Button, FInputChord() );
UI_COMMAND( ForceRefreshPreviews, "Force Refresh Previews", "Forces a refresh of all previews", EUserInterfaceActionType::Button, FInputChord(EKeys::SpaceBar) );
UI_COMMAND( CreateComponentMaskNode, "Create ComponentMask Node", "Creates a ComponentMask node at the current cursor position.", EUserInterfaceActionType::Button, FInputChord(EModifierKey::Shift, EKeys::C));
UI_COMMAND( FindInMaterial, "Search", "Finds expressions and comments in the current Material", EUserInterfaceActionType::Button, FInputChord(EModifierKey::Control, EKeys::F));
UI_COMMAND( PromoteToParameter, "Promote to Parameter", "Promote selected Pin to parameter of pin type", EUserInterfaceActionType::Button, FInputChord());
UI_COMMAND(QualityLevel_All, "All", "Sets node preview to show all quality levels.)", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(QualityLevel_Epic, "Epic", "Sets node preview to Epic quality.", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(QualityLevel_High, "High", "Sets node preview to high quality.", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(QualityLevel_Medium, "Medium", "Sets node preview to medium quality.", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(QualityLevel_Low, "Low", "Sets node preview to low quality.", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(FeatureLevel_All, "All", "Sets node preview to show all feature levels.", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(FeatureLevel_ES31, "ES3.1", "Sets node preview to show the ES3.1 feature level.", EUserInterfaceActionType::RadioButton, FInputChord());
UI_COMMAND(FeatureLevel_SM5, "SM5", "Sets node preview to show the SM5 feature level.", EUserInterfaceActionType::RadioButton, FInputChord());
}
//////////////////////////////////////////////////////////////////////////
// FExpressionSpawnInfo
TSharedPtr< FEdGraphSchemaAction > FExpressionSpawnInfo::GetAction(UEdGraph* InDestGraph)
{
if (MaterialExpressionClass == UMaterialExpressionComment::StaticClass())
{
return MakeShareable(new FMaterialGraphSchemaAction_NewComment);
}
else
{
TSharedPtr<FMaterialGraphSchemaAction_NewNode> NewNodeAction(new FMaterialGraphSchemaAction_NewNode);
NewNodeAction->MaterialExpressionClass = MaterialExpressionClass;
return NewNodeAction;
}
}
//////////////////////////////////////////////////////////////////////////
// FMaterialEditorSpawnNodeCommands
void FMaterialEditorSpawnNodeCommands::RegisterCommands()
{
const FString ConfigSection = TEXT("MaterialEditorSpawnNodes");
const FString SettingName = TEXT("Node");
TArray< FString > NodeSpawns;
GConfig->GetArray(*ConfigSection, *SettingName, NodeSpawns, GEditorPerProjectIni);
for(int32 x = 0; x < NodeSpawns.Num(); ++x)
{
FString ClassName;
if(!FParse::Value(*NodeSpawns[x], TEXT("Class="), ClassName))
{
// Could not find a class name, cannot continue with this line
continue;
}
FString CommandLabel;
UClass* FoundClass = FindObject<UClass>(ANY_PACKAGE, *ClassName, true);
TSharedPtr< FExpressionSpawnInfo > InfoPtr;
if(FoundClass && FoundClass->IsChildOf(UMaterialExpression::StaticClass()))
{
// The class name matches that of a UMaterialExpression, so setup a spawn info that can generate one
CommandLabel = FoundClass->GetName();
InfoPtr = MakeShareable(new FExpressionSpawnInfo(FoundClass));
}
// If spawn info was created, setup a UI Command for keybinding.
if(InfoPtr.IsValid())
{
TSharedPtr< FUICommandInfo > CommandInfo;
FKey Key;
bool bShift = false;
bool bCtrl = false;
bool bAlt = false;
// Parse the keybinding information
FString KeyString;
if( FParse::Value(*NodeSpawns[x], TEXT("Key="), KeyString) )
{
Key = *KeyString;
}
if( Key.IsValid() )
{
FParse::Bool(*NodeSpawns[x], TEXT("Shift="), bShift);
FParse::Bool(*NodeSpawns[x], TEXT("Alt="), bAlt);
FParse::Bool(*NodeSpawns[x], TEXT("Ctrl="), bCtrl);
}
FInputChord Chord(Key, EModifierKey::FromBools(bCtrl, bAlt, bShift, false));
const FText CommandLabelText = FText::FromString( CommandLabel );
const FText Description = FText::Format( NSLOCTEXT("MaterialEditor", "NodeSpawnDescription", "Hold down the bound keys and left click in the graph panel to spawn a {0} node."), CommandLabelText);
FUICommandInfo::MakeCommandInfo( this->AsShared(), CommandInfo, FName(*NodeSpawns[x]), CommandLabelText, Description, FSlateIcon(FEditorStyle::GetStyleSetName(), *FString::Printf(TEXT("%s.%s"), *this->GetContextName().ToString(), *NodeSpawns[x])), EUserInterfaceActionType::Button, Chord );
InfoPtr->CommandInfo = CommandInfo;
NodeCommands.Add(InfoPtr);
}
}
}
TSharedPtr< FEdGraphSchemaAction > FMaterialEditorSpawnNodeCommands::GetGraphActionByChord(FInputChord& InChord, UEdGraph* InDestGraph) const
{
if(InChord.IsValidChord())
{
for(int32 x = 0; x < NodeCommands.Num(); ++x)
{
if (NodeCommands[x]->CommandInfo->HasActiveChord(InChord))
{
return NodeCommands[x]->GetAction(InDestGraph);
}
}
}
return TSharedPtr< FEdGraphSchemaAction >();
}
const TSharedPtr<const FInputChord> FMaterialEditorSpawnNodeCommands::GetChordByClass(UClass* MaterialExpressionClass) const
{
for(int32 Index = 0; Index < NodeCommands.Num(); ++Index)
{
if (NodeCommands[Index]->GetClass() == MaterialExpressionClass && NodeCommands[Index]->CommandInfo->GetFirstValidChord()->IsValidChord())
{
// Just return the first valid chord
return NodeCommands[Index]->CommandInfo->GetFirstValidChord();
}
}
return TSharedPtr< const FInputChord >();
}
#undef LOCTEXT_NAMESPACE
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