VulkanState.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    VulkanState.h: Vulkan state definitions.
=============================================================================*/
 
#pragma once
 
#include "RHI.h"
#include "RHIResources.h"
#include "VulkanCommon.h"
#include "VulkanThirdParty.h"
 
class FVulkanDevice;
 
class FVulkanSamplerState : public FRHISamplerState
{
public:
    FVulkanSamplerState(const VkSamplerCreateInfo& InInfo, FVulkanDevice& InDevice, const bool bInIsImmutable = false);
    
    virtual bool IsImmutable() const final override { return bIsImmutable; }
 
    VkSampler Sampler;
    uint32 SamplerId;
    FRHIDescriptorHandle BindlessHandle;
 
    static void SetupSamplerCreateInfo(const FSamplerStateInitializerRHI& Initializer, FVulkanDevice& InDevice, VkSamplerCreateInfo& OutSamplerInfo);
 
    virtual FRHIDescriptorHandle GetBindlessHandle() const override final { return BindlessHandle; }
 
private:
    bool bIsImmutable;
};
 
class FVulkanRasterizerState : public FRHIRasterizerState
{
public:
    FVulkanRasterizerState(const FRasterizerStateInitializerRHI& InInitializer);
 
    static void ResetCreateInfo(VkPipelineRasterizationStateCreateInfo& OutInfo)
    {
        ZeroVulkanStruct(OutInfo, VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO);
        OutInfo.frontFace = VK_FRONT_FACE_CLOCKWISE;
        OutInfo.lineWidth = 1.0f;
    }
 
    virtual bool GetInitializer(FRasterizerStateInitializerRHI& Out) override final
    {
        Out = Initializer;
        return true;
    }
 
    VkPipelineRasterizationStateCreateInfo  RasterizerState;
    FRasterizerStateInitializerRHI          Initializer;
};
 
class FVulkanDepthStencilState : public FRHIDepthStencilState
{
public:
    FVulkanDepthStencilState(const FDepthStencilStateInitializerRHI& InInitializer)
    {
        Initializer = InInitializer;
    }
 
    virtual bool GetInitializer(FDepthStencilStateInitializerRHI& Out) override final
    {
        Out = Initializer;
        return true;
    }
 
    void SetupCreateInfo(const FGraphicsPipelineStateInitializer& GfxPSOInit, VkPipelineDepthStencilStateCreateInfo& OutDepthStencilState);
 
    FDepthStencilStateInitializerRHI Initializer;
};
 
class FVulkanBlendState : public FRHIBlendState
{
public:
    FVulkanBlendState(const FBlendStateInitializerRHI& InInitializer);
 
    virtual bool GetInitializer(FBlendStateInitializerRHI& Out) override final
    {
        Out = Initializer;
        return true;
    }
 
    // array the pipeline state can point right to
    VkPipelineColorBlendAttachmentState BlendStates[MaxSimultaneousRenderTargets];
 
    FBlendStateInitializerRHI Initializer;
};