o3de/Gems/AtomTressFX/Assets/Passes/HairShortCutGeometryDepthAlpha.pass

{
    "Type": "JsonSerialization",
    "Version": 1,
    "ClassName": "PassAsset",
    "ClassData": {
        "PassTemplate": {
            "Name": "HairShortCutGeometryDepthAlphaPassTemplate",
            "PassClass": "HairShortCutGeometryDepthAlphaPass",
            "Slots": [
                {
                    "Name": "SkinnedHairSharedBuffer",
                    "ShaderInputName": "m_skinnedHairSharedBuffer",
                    "SlotType": "Input",
                    "ScopeAttachmentUsage": "Shader"
                },
                {   // DepthStencil for early disqualifying the pixel based on depth.  No write.
                    "Name": "Depth",
                    "SlotType": "Input",
                    "ScopeAttachmentUsage": "DepthStencil"
                },
                {
                    // the regular render target is blended using inverse alpha to reduce the 
                    // incoming color contribution based on the hair thickness and alpha.
                    "Name": "InverseAlphaRTOutput",
                    "SlotType": "Output",
                    "ScopeAttachmentUsage": "RenderTarget",
                    "LoadStoreAction": {
                        "LoadAction": "Clear",
                        "ClearValue": {
                            "Value": [ 1.0, 1.0, 1.0, 1.0 ]
                        },
                        "StoreAction": "Store"
                    }
                },
                {
                    "Name": "HairDepthsTextureArray",
                    "SlotType": "Output",
                    "ScopeAttachmentUsage": "Shader",
                    "ShaderInputName": "m_RWFragmentDepthsTexture",
                    "LoadStoreAction": {
                        "LoadAction": "Clear",
                        "ClearValue": { // reverse depth order: closer --> 1.0
                            "Value": [ 0.0, 0.0, 0.0, 0.0 ]
                        },
                        "StoreAction": "Store"
                    }
                }
            ],
            "ImageAttachments": [
                {
                    // This buffer is used as the render target and should be at non-MSAA screen resolution
                    // to make sure no overwork is done.
                    "Name": "InverseAlphaRTImage",
                    "SizeSource": {
                        "Source": {
                            "Pass": "Parent",
                            "Attachment": "DepthLinear"
                        }
                    },
                    "ImageDescriptor": {
                        "Format": "R32_FLOAT",
                        "SharedQueueMask": "Graphics",
                        "BindFlags": [
                            "Color",
                            "ShaderRead"
                        ]
                    }
                },
                {
                    "Name": "HairDepthsTextureArray",
                    "SizeSource": {
                        "Source": {
                            "Pass": "Parent",
                            "Attachment": "DepthLinear"
                        }
                    },
                    "ImageDescriptor": {
                        "Format": "R32_UINT",
                        "ArraySize": "3",
                        "SharedQueueMask": "Graphics",
                        "BindFlags": [
                            "ShaderReadWrite",
                            "ShaderWrite",
                            "ShaderRead"
                        ]
                    }
                }
            ],
             "Connections": [
                {
                    "LocalSlot": "InverseAlphaRTOutput",
                    "AttachmentRef": {
                        "Pass": "This",
                        "Attachment": "InverseAlphaRTImage"
                    }
                }
            ],
            "PassData": {
                "$type": "RasterPassData",
                "DrawListTag": "HairGeometryDepthAlphaDrawList",
                "BindViewSrg": true,
                "PassSrgShaderAsset": {
                    // Looking for it in the Shaders directory relative to the Assets directory
                    "FilePath": "Shaders/HairShortCutGeometryDepthAlpha.shader"
                }
            }
        }
    }
}