HairStrandsTile.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    HairVisibilityRendering.h: Hair strands visibility buffer implementation.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RendererInterface.h"
#include "RenderGraphResources.h"
#include "GlobalShader.h"
#include "ShaderParameterStruct.h"
#include "HairStrandsData.h"
 
class FViewInfo;
 
class FHairStrandsTilePassVS : public FGlobalShader
{
    DECLARE_GLOBAL_SHADER(FHairStrandsTilePassVS);
    SHADER_USE_PARAMETER_STRUCT(FHairStrandsTilePassVS, FGlobalShader);
 
    BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
        SHADER_PARAMETER(FIntPoint, ViewMin)
        SHADER_PARAMETER(int32, bRectPrimitive)
        SHADER_PARAMETER(uint32, TileType)
        SHADER_PARAMETER(FVector2f, ViewInvSize)
        SHADER_PARAMETER_RDG_BUFFER_SRV(Buffer, TileDataBuffer)
        RDG_BUFFER_ACCESS(TileIndirectBuffer, ERHIAccess::IndirectArgs)
    END_SHADER_PARAMETER_STRUCT()
 
    static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters);
    static void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment);
};
 
FHairStrandsTilePassVS::FParameters GetHairStrandsTileParameters(const FViewInfo& InView, const FHairStrandsTiles& In, FHairStrandsTiles::ETileType TileType);
 
FHairStrandsTiles AddHairStrandsGenerateTilesPass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FRDGTextureRef& InputTexture);
 
FHairStrandsTiles AddHairStrandsGenerateTilesPass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FIntPoint& Extent);
 
void AddHairStrandsTileClearPass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FHairStrandsTiles& TileData,
    FHairStrandsTiles::ETileType TileType,
    FRDGTextureRef OutTexture);
 
void AddHairStrandsDebugTilePass(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View,
    const FRDGTextureRef& ColorTexture,
    const FHairStrandsTiles& TileData);