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https://github.com/PixarAnimationStudios/OpenSubdiv
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New text:
Copyright 2013 Pixar
Licensed under the Apache License, Version 2.0 (the "Apache License")
with the following modification; you may not use this file except in
compliance with the Apache License and the following modification to it:
Section 6. Trademarks. is deleted and replaced with:
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor
and its affiliates, except as required to comply with Section 4(c) of
the License and to reproduce the content of the NOTICE file.
You may obtain a copy of the Apache License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the Apache License with the above modification is
distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the Apache License for the specific
language governing permissions and limitations under the Apache License.
318 lines
9.0 KiB
HLSL
318 lines
9.0 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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#ifdef OSD_TRANSITION_TRIANGLE_SUBPATCH
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#define HS_DOMAIN "tri"
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#else
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#define HS_DOMAIN "quad"
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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(ModelViewMatrix, 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.HullBSpline
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//----------------------------------------------------------
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// Regular
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static float4x4 Q = {
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1.f/6.f, 4.f/6.f, 1.f/6.f, 0.f,
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0.f, 4.f/6.f, 2.f/6.f, 0.f,
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0.f, 2.f/6.f, 4.f/6.f, 0.f,
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0.f, 1.f/6.f, 4.f/6.f, 1.f/6.f
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};
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// Boundary / Corner
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static float4x3 B = {
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1.f, 0.f, 0.f,
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4.f/6.f, 2.f/6.f, 0.f,
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2.f/6.f, 4.f/6.f, 0.f,
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1.f/6.f, 4.f/6.f, 1.f/6.f
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};
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#ifdef OSD_PATCH_TRANSITION
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HS_CONSTANT_TRANSITION_FUNC_OUT
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#else
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HS_CONSTANT_FUNC_OUT
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#endif
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HSConstFunc(
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InputPatch<HullVertex, OSD_PATCH_INPUT_SIZE> patch,
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uint primitiveID : SV_PrimitiveID)
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{
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#ifdef OSD_PATCH_TRANSITION
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HS_CONSTANT_TRANSITION_FUNC_OUT output;
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#else
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HS_CONSTANT_FUNC_OUT output;
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#endif
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int patchLevel = GetPatchLevel(primitiveID);
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#ifdef OSD_TRANSITION_TRIANGLE_SUBPATCH
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OSD_PATCH_CULL_TRIANGLE(OSD_PATCH_INPUT_SIZE);
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#else
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OSD_PATCH_CULL(OSD_PATCH_INPUT_SIZE);
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#endif
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#ifdef OSD_PATCH_TRANSITION
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float3 cp[OSD_PATCH_INPUT_SIZE];
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for(int k = 0; k < OSD_PATCH_INPUT_SIZE; ++k) cp[k] = patch[k].position.xyz;
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SetTransitionTessLevels(output, cp, patchLevel);
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#else
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#if defined OSD_PATCH_BOUNDARY
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const int p[4] = { 1, 2, 5, 6 };
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#elif defined OSD_PATCH_CORNER
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const int p[4] = { 1, 2, 4, 5 };
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#else
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const int p[4] = { 5, 6, 9, 10 };
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#endif
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#ifdef OSD_ENABLE_SCREENSPACE_TESSELLATION
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output.tessLevelOuter[0] = TessAdaptive(patch[p[0]].position.xyz, patch[p[2]].position.xyz);
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output.tessLevelOuter[1] = TessAdaptive(patch[p[0]].position.xyz, patch[p[1]].position.xyz);
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output.tessLevelOuter[2] = TessAdaptive(patch[p[1]].position.xyz, patch[p[3]].position.xyz);
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output.tessLevelOuter[3] = TessAdaptive(patch[p[2]].position.xyz, patch[p[3]].position.xyz);
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output.tessLevelInner[0] = max(output.tessLevelOuter[1], output.tessLevelOuter[3]);
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output.tessLevelInner[1] = max(output.tessLevelOuter[0], output.tessLevelOuter[2]);
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#else
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output.tessLevelInner[0] = GetTessLevel(patchLevel);
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output.tessLevelInner[1] = GetTessLevel(patchLevel);
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output.tessLevelOuter[0] = GetTessLevel(patchLevel);
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output.tessLevelOuter[1] = GetTessLevel(patchLevel);
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output.tessLevelOuter[2] = GetTessLevel(patchLevel);
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output.tessLevelOuter[3] = GetTessLevel(patchLevel);
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#endif
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#endif
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return output;
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}
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[domain(HS_DOMAIN)]
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[partitioning("integer")]
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[outputtopology("triangle_cw")]
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[outputcontrolpoints(16)]
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[patchconstantfunc("HSConstFunc")]
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HullVertex hs_main_patches(
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in InputPatch<HullVertex, OSD_PATCH_INPUT_SIZE> 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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int i = ID%4;
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int j = ID/4;
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#if defined OSD_PATCH_BOUNDARY
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float3 H[3];
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for (int l=0; l<3; ++l) {
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H[l] = float3(0,0,0);
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for (int k=0; k<4; ++k) {
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H[l] += Q[i][k] * patch[l*4 + k].position.xyz;
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}
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}
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float3 pos = float3(0,0,0);
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for (int k=0; k<3; ++k) {
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pos += B[j][k]*H[k];
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}
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#elif defined OSD_PATCH_CORNER
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float3 H[3];
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for (int l=0; l<3; ++l) {
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H[l] = float3(0,0,0);
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for (int k=0; k<3; ++k) {
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H[l] += B[3-i][2-k] * patch[l*3 + k].position.xyz;
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}
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}
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float3 pos = float3(0,0,0);
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for (int k=0; k<3; ++k) {
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pos += B[j][k]*H[k];
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}
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#else // not OSD_PATCH_BOUNDARY, not OSD_PATCH_CORNER
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float3 H[4];
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for (int l=0; l<4; ++l) {
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H[l] = float3(0,0,0);
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for(int k=0; k<4; ++k) {
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H[l] += Q[i][k] * patch[l*4 + k].position.xyz;
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}
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}
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float3 pos = float3(0,0,0);
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for (int k=0; k<4; ++k){
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pos += Q[j][k]*H[k];
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}
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#endif
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HullVertex output;
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output.position = float4(pos, 1.0);
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int patchLevel = GetPatchLevel(primitiveID);
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// +0.5 to avoid interpolation error of integer value
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output.patchCoord = float4(0, 0,
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patchLevel+0.5,
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primitiveID+PrimitiveIdBase+0.5);
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OSD_COMPUTE_PTEX_COORD_HULL_SHADER;
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return output;
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}
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//----------------------------------------------------------
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// Patches.DomainBSpline
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//----------------------------------------------------------
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// B-spline basis evaluation via deBoor pyramid...
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void
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EvalCubicBSpline(in float u, out float B[4], out float BU[4])
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{
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float t = u;
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float s = 1.0 - u;
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float C0 = s * (0.5 * s);
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float C1 = t * (s + 0.5 * t) + s * (0.5 * s + t);
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float C2 = t * ( 0.5 * t);
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B[0] = 1.f/3.f * s * C0;
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B[1] = (2.f/3.f * s + t) * C0 + (2.f/3.f * s + 1.f/3.f * t) * C1;
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B[2] = (1.f/3.f * s + 2.f/3.f * t) * C1 + ( s + 2.f/3.f * t) * C2;
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B[3] = 1.f/3.f * t * C2;
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BU[0] = - C0;
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BU[1] = C0 - C1;
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BU[2] = C1 - C2;
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BU[3] = C2;
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}
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void
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Univar4x4(in float u, out float B[4], out float D[4])
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{
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float t = u;
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float s = 1.0 - u;
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float A0 = s * s;
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float A1 = 2 * s * t;
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float A2 = t * t;
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B[0] = s * A0;
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B[1] = t * A0 + s * A1;
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B[2] = t * A1 + s * A2;
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B[3] = t * A2;
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D[0] = - A0;
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D[1] = A0 - A1;
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D[2] = A1 - A2;
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D[3] = A2;
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}
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[domain(HS_DOMAIN)]
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void ds_main_patches(
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#ifdef OSD_PATCH_TRANSITION
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in HS_CONSTANT_TRANSITION_FUNC_OUT input,
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#else
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in HS_CONSTANT_FUNC_OUT input,
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#endif
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in OutputPatch<HullVertex, 16> patch,
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#ifdef OSD_TRANSITION_TRIANGLE_SUBPATCH
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in float3 domainCoord : SV_DomainLocation,
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#else
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in float2 domainCoord : SV_DomainLocation,
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#endif
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out OutputVertex output )
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{
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#ifdef OSD_PATCH_TRANSITION
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float2 UV = GetTransitionSubpatchUV(domainCoord);
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#else
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float2 UV = domainCoord;
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#endif
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float B[4], D[4];
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Univar4x4(UV.x, B, D);
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float3 BUCP[4], DUCP[4];
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for (int i=0; i<4; ++i) {
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BUCP[i] = float3(0,0,0);
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DUCP[i] = float3(0,0,0);
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for (int j=0; j<4; ++j) {
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#if OSD_TRANSITION_ROTATE == 1
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float3 A = patch[4*(3-j) + i].position.xyz;
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#elif OSD_TRANSITION_ROTATE == 2
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float3 A = patch[4*(3-i) + (3-j)].position.xyz;
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#elif OSD_TRANSITION_ROTATE == 3
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float3 A = patch[4*j + (3-i)].position.xyz;
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#else // OSD_TRANSITION_ROTATE == 0, or non-transition patch
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float3 A = patch[4*i + j].position.xyz;
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#endif
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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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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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Univar4x4(UV.y, B, D);
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for (int k=0; k<4; ++k) {
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WorldPos += B[k] * BUCP[k];
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Tangent += B[k] * DUCP[k];
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BiTangent += D[k] * BUCP[k];
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}
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float3 normal = normalize(cross(Tangent, BiTangent));
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output.position = float4(WorldPos, 1.0f);
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output.normal = normal;
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output.tangent = normalize(Tangent);
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output.patchCoord = patch[0].patchCoord;
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#if OSD_TRANSITION_ROTATE == 1
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output.patchCoord.xy = float2(UV.y, 1.0-UV.x);
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#elif OSD_TRANSITION_ROTATE == 2
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output.patchCoord.xy = float2(1.0-UV.x, 1.0-UV.y);
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#elif OSD_TRANSITION_ROTATE == 3
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output.patchCoord.xy = float2(1.0-UV.y, UV.x);
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#else // OSD_TRANNSITION_ROTATE == 0, or non-transition patch
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output.patchCoord.xy = float2(UV.x, UV.y);
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#endif
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OSD_COMPUTE_PTEX_COORD_DOMAIN_SHADER;
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OSD_DISPLACEMENT_CALLBACK;
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output.positionOut = mul(ProjectionMatrix, float4(WorldPos, 1.0f));
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}
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