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79 行
2.8 KiB
79 行
2.8 KiB
AttributesTessellation VertTessellation(Attributes input)
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{
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return AttributesToAttributesTessellation(input);
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}
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struct TessellationFactors
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{
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float edge[3] : SV_TessFactor;
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float inside : SV_InsideTessFactor;
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};
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TessellationFactors HullConstant(InputPatch<AttributesTessellation, 3> input)
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{
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Attributes params[3];
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params[0] = AttributesTessellationToAttributes(input[0]);
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params[1] = AttributesTessellationToAttributes(input[1]);
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params[2] = AttributesTessellationToAttributes(input[2]);
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#if (SHADERPASS != SHADERPASS_VELOCITY) && (SHADERPASS != SHADERPASS_DISTORTION)
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// TEMP: We will provide world position but for now convert to world position here
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float3 p0 = TransformObjectToWorld(input[0].positionOS);
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float3 n0 = TransformObjectToWorldNormal(input[0].normalOS);
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float3 p1 = TransformObjectToWorld(input[1].positionOS);
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float3 n1 = TransformObjectToWorldNormal(input[1].normalOS);
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float3 p2 = TransformObjectToWorld(input[2].positionOS);
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float3 n2 = TransformObjectToWorldNormal(input[2].normalOS);
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float4 tf = TessellationEdge(p0, p1, p2, n0, n1, n2);
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#else
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float4 tf = float4(0.0, 0.0, 0.0, 0.0);
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#endif
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TessellationFactors ouput;
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ouput.edge[0] = tf.x;
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ouput.edge[1] = tf.y;
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ouput.edge[2] = tf.z;
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ouput.inside = tf.w;
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return ouput;
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}
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[maxtessfactor(15.0)] // AMD recommand this value for GCN http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2013/05/GCNPerformanceTweets.pdf
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[domain("tri")]
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[partitioning("fractional_odd")]
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[outputtopology("triangle_cw")]
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[patchconstantfunc("HullConstant")]
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[outputcontrolpoints(3)]
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AttributesTessellation Hull(InputPatch<AttributesTessellation, 3> input, uint id : SV_OutputControlPointID)
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{
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return input[id];
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}
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[domain("tri")]
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PackedVaryings Domain(TessellationFactors tessFactors, const OutputPatch<AttributesTessellation, 3> input, float3 baryCoords : SV_DomainLocation)
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{
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Attributes params = InterpolateWithBaryCoords(input[0], input[1], input[2], baryCoords);
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#ifndef _TESSELLATION_DISPLACEMENT // We have Phong tessellation in all case where we don't have only displacement
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#if (SHADERPASS != SHADERPASS_VELOCITY) && (SHADERPASS != SHADERPASS_DISTORTION)
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params.positionOS = PhongTessellation( params.positionOS,
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input[0].positionOS, input[1].positionOS, input[2].positionOS,
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input[0].normalOS, input[1].normalOS, input[2].normalOS,
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baryCoords, _TessellationShapeFactor);
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#endif
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#endif
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#if defined(_TESSELLATION_DISPLACEMENT) || defined(_TESSELLATION_DISPLACEMENT_PHONG)
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// perform displacement
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Displacement(params);
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#endif
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// Evaluate regular vertex shader
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PackedVaryings outout = Vert(params);
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return outout;
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}
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