mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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200 lines
5.8 KiB
Metal
200 lines
5.8 KiB
Metal
#line 0 "osd/mtlPatchGregoryBasis.metal"
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//
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// Copyright 2015 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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//----------------------------------------------------------
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// Patches.GregoryBasis.Hull
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//----------------------------------------------------------
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void OsdComputePerVertex(
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float4 position,
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threadgroup HullVertex& hullVertex,
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int vertexId,
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float4x4 modelViewProjectionMatrix,
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OsdPatchParamBufferSet osdBuffers
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)
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{
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hullVertex.position = position;
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#if OSD_ENABLE_PATCH_CULL
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float4 clipPos = mul(modelViewProjectionMatrix, position);
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short3 clip0 = short3(clipPos.x < clipPos.w,
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clipPos.y < clipPos.w,
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clipPos.z < clipPos.w);
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short3 clip1 = short3(clipPos.x > -clipPos.w,
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clipPos.y > -clipPos.w,
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clipPos.z > -clipPos.w);
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hullVertex.clipFlag = short3(clip0) + 2*short3(clip1);
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#endif
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}
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//----------------------------------------------------------
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// Patches.GregoryBasis.Factors
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//----------------------------------------------------------
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void OsdComputePerPatchFactors(
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int3 patchParam,
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float tessLevel,
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unsigned patchID,
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float4x4 projectionMatrix,
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float4x4 modelViewMatrix,
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OsdPatchParamBufferSet osdBuffer,
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threadgroup PatchVertexType* patchVertices,
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device MTLQuadTessellationFactorsHalf& quadFactors
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)
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{
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float4 tessLevelOuter = float4(0,0,0,0);
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float2 tessLevelInner = float2(0,0);
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OsdGetTessLevels(
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tessLevel,
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projectionMatrix,
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modelViewMatrix,
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patchVertices[0].position.xyz,
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patchVertices[3].position.xyz,
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patchVertices[2].position.xyz,
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patchVertices[1].position.xyz,
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patchParam,
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tessLevelOuter,
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tessLevelInner
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);
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quadFactors.edgeTessellationFactor[0] = tessLevelOuter[0];
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quadFactors.edgeTessellationFactor[1] = tessLevelOuter[1];
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quadFactors.edgeTessellationFactor[2] = tessLevelOuter[2];
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quadFactors.edgeTessellationFactor[3] = tessLevelOuter[3];
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quadFactors.insideTessellationFactor[0] = tessLevelInner[0];
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quadFactors.insideTessellationFactor[1] = tessLevelInner[1];
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}
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//----------------------------------------------------------
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// Patches.GregoryBasis.Vertex
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//----------------------------------------------------------
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void OsdComputePerPatchVertex(
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int3 patchParam,
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unsigned ID,
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unsigned PrimitiveID,
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unsigned ControlID,
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threadgroup PatchVertexType* patchVertices,
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OsdPatchParamBufferSet osdBuffers
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)
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{
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//Does nothing, all transforms are in the PTVS
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}
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//----------------------------------------------------------
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// Patches.GregoryBasis.Domain
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//----------------------------------------------------------
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#define USE_128BIT_GREGORY_BASIS_INDICES_READ 1
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#if USE_STAGE_IN
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template<typename PerPatchVertexGregoryBasis>
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#endif
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OsdPatchVertex ds_gregory_basis_patches(
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#if USE_STAGE_IN
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PerPatchVertexGregoryBasis patch,
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#else
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const device OsdInputVertexType* patch,
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const device unsigned* patchIndices,
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#endif
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int3 patchParam,
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float2 UV
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)
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{
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OsdPatchVertex output;
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float3 P = float3(0,0,0), dPu = float3(0,0,0), dPv = float3(0,0,0);
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float3 N = float3(0,0,0), dNu = float3(0,0,0), dNv = float3(0,0,0);
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#if USE_STAGE_IN
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float3 cv[20];
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for(int i = 0; i < 20; i++)
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cv[i] = patch[i].position;
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#else
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#if USE_128BIT_GREGORY_BASIS_INDICES_READ
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float3 cv[20];
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for(int i = 0; i < 5; i++) {
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int4 indices = ((device int4*)patchIndices)[i];
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int n = i * 4;
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cv[n + 0] = (patch + indices[0])->position;
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cv[n + 1] = (patch + indices[1])->position;
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cv[n + 2] = (patch + indices[2])->position;
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cv[n + 3] = (patch + indices[3])->position;
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}
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#else
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float3 cv[20];
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for (int i = 0; i < 20; ++i) {
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cv[i] = patch[patchIndices[i]].position;
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}
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#endif
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#endif
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OsdEvalPatchGregory(patchParam, UV, cv, P, dPu, dPv, N, dNu, dNv);
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output.position = P;
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output.normal = N;
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output.tangent = dPu;
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output.bitangent = dPv;
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#if OSD_COMPUTE_NORMAL_DERIVATIVES
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output.Nu = dNu;
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output.Nv = dNv;
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#endif
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output.patchCoord = OsdInterpolatePatchCoord(UV, patchParam);
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return output;
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}
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#if USE_STAGE_IN
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template<typename PerPatchVertexGregoryBasis>
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#endif
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OsdPatchVertex OsdComputePatch(
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float tessLevel,
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float2 domainCoord,
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unsigned patchID,
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#if USE_STAGE_IN
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PerPatchVertexGregoryBasis osdPatch
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#else
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OsdVertexBufferSet osdBuffers
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#endif
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)
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{
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return ds_gregory_basis_patches(
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#if USE_STAGE_IN
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osdPatch.cv,
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osdPatch.patchParam,
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#else
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osdBuffers.vertexBuffer,
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osdBuffers.indexBuffer + patchID * VERTEX_CONTROL_POINTS_PER_PATCH,
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osdBuffers.patchParamBuffer[patchID],
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#endif
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domainCoord
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);
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}
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