mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2025-01-09 08:10:07 +00:00
250 lines
7.2 KiB
HLSL
250 lines
7.2 KiB
HLSL
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#if defined OSD_FRACTIONAL_ODD_SPACING
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#define HS_PARTITION "fractional_odd"
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#elif defined OSD_FRACTIONAL_EVEN_SPACING
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#define HS_PARTITION "fractional_even"
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#else
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#define HS_PARTITION "integer"
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#endif
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//----------------------------------------------------------
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// Patches.Vertex
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//----------------------------------------------------------
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void vs_main_patches( in InputVertex input,
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out HullVertex output )
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{
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output.position = mul(OsdModelViewMatrix(), input.position);
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OSD_PATCH_CULL_COMPUTE_CLIPFLAGS(input.position);
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}
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//----------------------------------------------------------
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// Patches.HullGregoryBasis
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//----------------------------------------------------------
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HS_CONSTANT_FUNC_OUT
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HSConstFunc(
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InputPatch<HullVertex, 20> patch,
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uint primitiveID : SV_PrimitiveID)
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{
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HS_CONSTANT_FUNC_OUT output;
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int3 patchParam = OsdGetPatchParam(OsdGetPatchIndex(primitiveID));
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OSD_PATCH_CULL(20);
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float4 tessLevelOuter = float4(0,0,0,0);
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float4 tessLevelInner = float4(0,0,0,0);
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float4 tessOuterLo = float4(0,0,0,0);
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float4 tessOuterHi = float4(0,0,0,0);
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OsdGetTessLevels(patch[0].position.xyz, patch[5].position.xyz,
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patch[10].position.xyz, patch[15].position.xyz,
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patchParam, tessLevelOuter, tessLevelInner);
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output.tessLevelOuter[0] = tessLevelOuter[0];
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output.tessLevelOuter[1] = tessLevelOuter[1];
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output.tessLevelOuter[2] = tessLevelOuter[2];
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output.tessLevelOuter[3] = tessLevelOuter[3];
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output.tessLevelInner[0] = tessLevelInner[0];
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output.tessLevelInner[1] = tessLevelInner[1];
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return output;
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}
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[domain("quad")]
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[partitioning(HS_PARTITION)]
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[outputtopology("triangle_cw")]
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[outputcontrolpoints(20)]
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[patchconstantfunc("HSConstFunc")]
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HullVertex hs_main_patches(
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in InputPatch<HullVertex, 20> patch,
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uint primitiveID : SV_PrimitiveID,
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in uint ID : SV_OutputControlPointID )
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{
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int3 patchParam = OsdGetPatchParam(OsdGetPatchIndex(primitiveID));
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HullVertex output;
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output.position = float4(patch[ID].position.xyz, 1.0);
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output.patchCoord = OsdGetPatchCoord(patchParam);
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return output;
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}
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//----------------------------------------------------------
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// Patches.DomainGregory
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//----------------------------------------------------------
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[domain("quad")]
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void ds_main_patches(
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in HS_CONSTANT_FUNC_OUT input,
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in OutputPatch<HullVertex, 20> patch,
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in float2 uv : SV_DomainLocation,
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out OutputVertex output )
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{
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float u = uv.x,
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v = uv.y;
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float3 p[20];
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for (int i = 0; i < 20; ++i) {
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p[i] = patch[i].position.xyz;
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}
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float3 q[16];
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float U = 1-u, V=1-v;
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float d11 = u+v; if(u+v==0.0f) d11 = 1.0f;
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float d12 = U+v; if(U+v==0.0f) d12 = 1.0f;
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float d21 = u+V; if(u+V==0.0f) d21 = 1.0f;
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float d22 = U+V; if(U+V==0.0f) d22 = 1.0f;
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q[ 5] = (u*p[3] + v*p[4])/d11;
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q[ 6] = (U*p[9] + v*p[8])/d12;
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q[ 9] = (u*p[19] + V*p[18])/d21;
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q[10] = (U*p[13] + V*p[14])/d22;
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q[ 0] = p[0];
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q[ 1] = p[1];
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q[ 2] = p[7];
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q[ 3] = p[5];
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q[ 4] = p[2];
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q[ 7] = p[6];
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q[ 8] = p[16];
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q[11] = p[12];
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q[12] = p[15];
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q[13] = p[17];
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q[14] = p[11];
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q[15] = p[10];
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float3 WorldPos = float3(0, 0, 0);
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float3 Tangent = float3(0, 0, 0);
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float3 BiTangent = float3(0, 0, 0);
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#ifdef OSD_COMPUTE_NORMAL_DERIVATIVES
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float B[4], D[4], C[4];
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float3 BUCP[4] = {float3(0,0,0), float3(0,0,0), float3(0,0,0), float3(0,0,0)},
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DUCP[4] = {float3(0,0,0), float3(0,0,0), float3(0,0,0), float3(0,0,0)},
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CUCP[4] = {float3(0,0,0), float3(0,0,0), float3(0,0,0), float3(0,0,0)};
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float3 dUU = float3(0, 0, 0);
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float3 dVV = float3(0, 0, 0);
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float3 dUV = float3(0, 0, 0);
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Univar4x4(u, B, D, C);
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for (int i=0; i<4; ++i) {
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for (uint j=0; j<4; ++j) {
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float3 A = q[4*i + j];
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BUCP[i] += A * B[j];
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DUCP[i] += A * D[j];
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CUCP[i] += A * C[j];
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}
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}
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Univar4x4(v, B, D, C);
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for (int i=0; i<4; ++i) {
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WorldPos += B[i] * BUCP[i];
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Tangent += B[i] * DUCP[i];
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BiTangent += D[i] * BUCP[i];
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dUU += B[i] * CUCP[i];
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dVV += C[i] * BUCP[i];
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dUV += D[i] * DUCP[i];
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}
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int level = patch[0].patchCoord.z;
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BiTangent *= 3 * level;
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Tangent *= 3 * level;
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dUU *= 6 * level;
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dVV *= 6 * level;
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dUV *= 9 * level;
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float3 n = cross(Tangent, BiTangent);
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float3 normal = normalize(n);
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float E = dot(Tangent, Tangent);
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float F = dot(Tangent, BiTangent);
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float G = dot(BiTangent, BiTangent);
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float e = dot(normal, dUU);
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float f = dot(normal, dUV);
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float g = dot(normal, dVV);
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float3 Nu = (f*F-e*G)/(E*G-F*F) * Tangent + (e*F-f*E)/(E*G-F*F) * BiTangent;
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float3 Nv = (g*F-f*G)/(E*G-F*F) * Tangent + (f*F-g*E)/(E*G-F*F) * BiTangent;
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Nu = Nu/length(n) - n * (dot(Nu,n)/pow(dot(n,n), 1.5));
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Nv = Nv/length(n) - n * (dot(Nv,n)/pow(dot(n,n), 1.5));
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output.Nu = Nu;
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output.Nv = Nv;
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#else
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float B[4], D[4];
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float3 BUCP[4] = {float3(0,0,0), float3(0,0,0), float3(0,0,0), float3(0,0,0)},
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DUCP[4] = {float3(0,0,0), float3(0,0,0), float3(0,0,0), float3(0,0,0)};
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Univar4x4(uv.x, B, D);
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for (int i=0; i<4; ++i) {
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for (uint j=0; j<4; ++j) {
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float3 A = q[4*i + j];
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BUCP[i] += A * B[j];
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DUCP[i] += A * D[j];
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}
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}
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Univar4x4(uv.y, B, D);
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for (uint i=0; i<4; ++i) {
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WorldPos += B[i] * BUCP[i];
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Tangent += B[i] * DUCP[i];
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BiTangent += D[i] * BUCP[i];
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}
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int level = patch[0].patchCoord.z;
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BiTangent *= 3 * level;
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Tangent *= 3 * level;
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float3 normal = normalize(cross(Tangent, BiTangent));
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#endif
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output.position = float4(WorldPos, 1.0f);
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output.normal = normal;
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output.tangent = Tangent;
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output.bitangent = BiTangent;
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output.edgeDistance = 0;
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float2 UV = float2(u, v);
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output.patchCoord = OsdInterpolatePatchCoord(UV, patch[0].patchCoord);
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OSD_DISPLACEMENT_CALLBACK;
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output.positionOut = mul(OsdProjectionMatrix(), output.position);
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}
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