GenerateMips.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "PixelFormat.h"
#include "RHIDefinitions.h"
#include "RenderGraphDefinitions.h"
#include "Templates/SharedPointer.h"
 
class FRDGBuilder;
class FRHICommandListImmediate;
class FRHISamplerState;
class FRHITexture;
struct FGenerateMipsStruct;
 
struct FGenerateMipsParams
{
    ESamplerFilter Filter = SF_Bilinear;
    ESamplerAddressMode AddressU = AM_Clamp;
    ESamplerAddressMode AddressV = AM_Clamp;
    ESamplerAddressMode AddressW = AM_Clamp;
};
 
enum class EGenerateMipsPass
{
    AutoDetect,
    Compute,
    Raster
};
 
class FGenerateMips
{
public:
    static RENDERCORE_API bool WillFormatSupportCompute(EPixelFormat InPixelFormat);
 
    static RENDERCORE_API void Execute(
        FRDGBuilder& GraphBuilder,
        ERHIFeatureLevel::Type FeatureLevel,
        FRDGTextureRef Texture,
        FGenerateMipsParams Params = {},
        EGenerateMipsPass Pass = EGenerateMipsPass::AutoDetect);
 
    static RENDERCORE_API void Execute(
        FRDGBuilder& GraphBuilder,
        ERHIFeatureLevel::Type FeatureLevel,
        FRDGTextureRef Texture,
        FRHISamplerState* Sampler,
        EGenerateMipsPass Pass = EGenerateMipsPass::AutoDetect);
 
    static RENDERCORE_API void ExecuteCompute(
        FRDGBuilder& GraphBuilder, ERHIFeatureLevel::Type FeatureLevel,
        FRDGTextureRef Texture,
        FRHISamplerState* Sampler);
    
    static RENDERCORE_API void ExecuteCompute(
        FRDGBuilder& GraphBuilder,
        ERHIFeatureLevel::Type FeatureLevel,
        FRDGTextureRef Texture,
        FRHISamplerState* Sampler,
        FRDGBufferRef ConditionBuffer, uint32 Offset = 0);
 
    static RENDERCORE_API void ExecuteRaster(
        FRDGBuilder& GraphBuilder,
        ERHIFeatureLevel::Type FeatureLevel,
        FRDGTextureRef Texture,
        FRHISamplerState* Sampler);
};