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71 行
6.3 KiB
71 行
6.3 KiB
FragInputs BuildFragInputs(VaryingsMeshToPS input)
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{
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FragInputs output;
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ZERO_INITIALIZE(FragInputs, output);
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// Init to some default value to make the computer quiet (else it output 'divide by zero' warning even if value is not used).
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// TODO: this is a really poor workaround, but the variable is used in a bunch of places
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// to compute normals which are then passed on elsewhere to compute other values...
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output.worldToTangent = k_identity3x3;
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output.positionSS = input.positionCS; // input.positionCS is SV_Position
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$FragInputs.positionRWS: output.positionRWS = input.positionRWS;
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$FragInputs.worldToTangent: output.worldToTangent = BuildWorldToTangent(input.tangentWS, input.normalWS);
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$FragInputs.texCoord0: output.texCoord0 = input.texCoord0;
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$FragInputs.texCoord1: output.texCoord1 = input.texCoord1;
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$FragInputs.texCoord2: output.texCoord2 = input.texCoord2;
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$FragInputs.texCoord3: output.texCoord3 = input.texCoord3;
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$FragInputs.color: output.color = input.color;
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#if SHADER_STAGE_FRAGMENT
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$FragInputs.isFrontFace: output.isFrontFace = IS_FRONT_VFACE(input.cullFace, true, false); // TODO: SHADER_STAGE_FRAGMENT only
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$FragInputs.isFrontFace: // Handle handness of the view matrix (In Unity view matrix default to a determinant of -1)
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$FragInputs.isFrontFace: // when we render a cubemap the view matrix handness is flipped (due to convention used for cubemap) we have a determinant of +1
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$FragInputs.isFrontFace: output.isFrontFace = _DetViewMatrix < 0.0 ? output.isFrontFace : !output.isFrontFace;
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#endif // SHADER_STAGE_FRAGMENT
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return output;
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}
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SurfaceDescriptionInputs FragInputsToSurfaceDescriptionInputs(FragInputs input, float3 viewWS)
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{
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SurfaceDescriptionInputs output;
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ZERO_INITIALIZE(SurfaceDescriptionInputs, output);
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$SurfaceDescriptionInputs.WorldSpaceNormal: output.WorldSpaceNormal = normalize(input.worldToTangent[2].xyz);
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$SurfaceDescriptionInputs.ObjectSpaceNormal: output.ObjectSpaceNormal = mul(output.WorldSpaceNormal, (float3x3) UNITY_MATRIX_M); // transposed multiplication by inverse matrix to handle normal scale
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$SurfaceDescriptionInputs.ViewSpaceNormal: output.ViewSpaceNormal = mul(output.WorldSpaceNormal, (float3x3) UNITY_MATRIX_I_V); // transposed multiplication by inverse matrix to handle normal scale
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$SurfaceDescriptionInputs.TangentSpaceNormal: output.TangentSpaceNormal = float3(0.0f, 0.0f, 1.0f);
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$SurfaceDescriptionInputs.WorldSpaceTangent: output.WorldSpaceTangent = input.worldToTangent[0].xyz;
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$SurfaceDescriptionInputs.ObjectSpaceTangent: output.ObjectSpaceTangent = TransformWorldToObjectDir(output.WorldSpaceTangent);
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$SurfaceDescriptionInputs.ViewSpaceTangent: output.ViewSpaceTangent = TransformWorldToViewDir(output.WorldSpaceTangent);
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$SurfaceDescriptionInputs.TangentSpaceTangent: output.TangentSpaceTangent = float3(1.0f, 0.0f, 0.0f);
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$SurfaceDescriptionInputs.WorldSpaceBiTangent: output.WorldSpaceBiTangent = input.worldToTangent[1].xyz;
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$SurfaceDescriptionInputs.ObjectSpaceBiTangent: output.ObjectSpaceBiTangent = TransformWorldToObjectDir(output.WorldSpaceBiTangent);
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$SurfaceDescriptionInputs.ViewSpaceBiTangent: output.ViewSpaceBiTangent = TransformWorldToViewDir(output.WorldSpaceBiTangent);
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$SurfaceDescriptionInputs.TangentSpaceBiTangent: output.TangentSpaceBiTangent = float3(0.0f, 1.0f, 0.0f);
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$SurfaceDescriptionInputs.WorldSpaceViewDirection: output.WorldSpaceViewDirection = normalize(viewWS);
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$SurfaceDescriptionInputs.ObjectSpaceViewDirection: output.ObjectSpaceViewDirection = TransformWorldToObjectDir(output.WorldSpaceViewDirection);
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$SurfaceDescriptionInputs.ViewSpaceViewDirection: output.ViewSpaceViewDirection = TransformWorldToViewDir(output.WorldSpaceViewDirection);
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$SurfaceDescriptionInputs.TangentSpaceViewDirection: float3x3 tangentSpaceTransform = float3x3(output.WorldSpaceTangent,output.WorldSpaceBiTangent,output.WorldSpaceNormal);
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$SurfaceDescriptionInputs.TangentSpaceViewDirection: output.TangentSpaceViewDirection = mul(tangentSpaceTransform, output.WorldSpaceViewDirection);
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$SurfaceDescriptionInputs.WorldSpacePosition: output.WorldSpacePosition = GetAbsolutePositionWS(input.positionRWS);
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$SurfaceDescriptionInputs.ObjectSpacePosition: output.ObjectSpacePosition = TransformWorldToObject(input.positionRWS);
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$SurfaceDescriptionInputs.ViewSpacePosition: output.ViewSpacePosition = TransformWorldToView(input.positionRWS);
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$SurfaceDescriptionInputs.TangentSpacePosition: output.TangentSpacePosition = float3(0.0f, 0.0f, 0.0f);
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$SurfaceDescriptionInputs.ScreenPosition: output.ScreenPosition = ComputeScreenPos(TransformWorldToHClip(input.positionRWS), _ProjectionParams.x);
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$SurfaceDescriptionInputs.uv0: output.uv0 = float4(input.texCoord0, 0.0f, 0.0f);
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$SurfaceDescriptionInputs.uv1: output.uv1 = float4(input.texCoord1, 0.0f, 0.0f);
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$SurfaceDescriptionInputs.uv2: output.uv2 = float4(input.texCoord2, 0.0f, 0.0f);
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$SurfaceDescriptionInputs.uv3: output.uv3 = float4(input.texCoord3, 0.0f, 0.0f);
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$SurfaceDescriptionInputs.VertexColor: output.VertexColor = input.color;
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$SurfaceDescriptionInputs.FaceSign: output.FaceSign = input.isFrontFace;
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return output;
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}
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// existing HDRP code uses the combined function to go directly from packed to frag inputs
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FragInputs UnpackVaryingsMeshToFragInputs(PackedVaryingsMeshToPS input)
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{
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VaryingsMeshToPS unpacked= UnpackVaryingsMeshToPS(input);
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return BuildFragInputs(unpacked);
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}
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