46 lines
1.4 KiB
HLSL
46 lines
1.4 KiB
HLSL
// Copyright (c) Wojciech Figat. All rights reserved.
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@0// Motion Vectors: Defines
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@1// Motion Vectors: Includes
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@2// Motion Vectors: Constants
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@3// Motion Vectors: Resources
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@4// Motion Vectors: Utilities
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@5// Motion Vectors: Shaders
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// Pixel Shader function for Motion Vectors Pass
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META_PS(true, FEATURE_LEVEL_ES2)
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float4 PS_MotionVectors(PixelInput input) : SV_Target0
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{
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#if USE_DITHERED_LOD_TRANSITION || MATERIAL_MASKED
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MaterialInput materialInput = GetMaterialInput(input);
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#if USE_DITHERED_LOD_TRANSITION
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ClipLODTransition(materialInput);
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#endif
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#endif
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#if MATERIAL_MASKED
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// Perform per pixel clipping if material requries it
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Material material = GetMaterialPS(materialInput);
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clip(material.Mask - MATERIAL_MASK_THRESHOLD);
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#endif
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// Calculate this and previosu frame pixel locations in clip space
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float4 prevClipPos = mul(float4(input.Geometry.PrevWorldPosition, 1), PrevViewProjectionMatrix);
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float4 curClipPos = mul(float4(input.Geometry.WorldPosition, 1), ViewProjectionMatrix);
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float2 prevHPos = prevClipPos.xy / prevClipPos.w;
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float2 curHPos = curClipPos.xy / curClipPos.w;
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// Revert temporal jitter offset
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prevHPos -= TemporalAAJitter.zw;
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curHPos -= TemporalAAJitter.xy;
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// Clip Space -> UV Space
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float2 vPosPrev = prevHPos.xy * 0.5f + 0.5f;
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float2 vPosCur = curHPos.xy * 0.5f + 0.5f;
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vPosPrev.y = 1.0 - vPosPrev.y;
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vPosCur.y = 1.0 - vPosCur.y;
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// Calculate per-pixel motion vector
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return float4(vPosCur - vPosPrev, 0, 1);
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}
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