mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-09 13:50:05 +00:00
67cc2a3810
Updated the Gregory patch tessellation shaders to account for transition edges. Changed the implementation of OsdGetTessParameterizationTriangle() to take the input parametric location as a 3-component value. This allows the edge parameterization to be more numerically robust and consistent. Also, corrected some minor discrepancies between the various tessellation shader configurations.
284 lines
8.4 KiB
Metal
284 lines
8.4 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 OsdComputePerPatchGregoryFactors(
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int3 patchParam,
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float tessLevel,
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float4x4 projectionMatrix,
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float4x4 modelViewMatrix,
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threadgroup PatchVertexType* patchVertices,
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#if !USE_PTVS_FACTORS
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device OsdPerPatchTessFactors& patchFactors,
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#endif
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device MTLQuadTessellationFactorsHalf& quadFactors
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)
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{
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float4 tessLevelOuter = float4(0);
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float2 tessLevelInner = float2(0);
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float4 tessOuterLo = float4(0);
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float4 tessOuterHi = float4(0);
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#if OSD_ENABLE_SCREENSPACE_TESSELLATION
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// Gather bezier control points to compute limit surface tess levels
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float3 bezcv[16];
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bezcv[ 0] = patchVertices[ 0].position.xyz;
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bezcv[ 1] = patchVertices[ 1].position.xyz;
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bezcv[ 2] = patchVertices[ 7].position.xyz;
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bezcv[ 3] = patchVertices[ 5].position.xyz;
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bezcv[ 4] = patchVertices[ 2].position.xyz;
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bezcv[ 5] = patchVertices[ 3].position.xyz;
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bezcv[ 6] = patchVertices[ 8].position.xyz;
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bezcv[ 7] = patchVertices[ 6].position.xyz;
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bezcv[ 8] = patchVertices[16].position.xyz;
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bezcv[ 9] = patchVertices[18].position.xyz;
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bezcv[10] = patchVertices[13].position.xyz;
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bezcv[11] = patchVertices[12].position.xyz;
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bezcv[12] = patchVertices[15].position.xyz;
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bezcv[13] = patchVertices[17].position.xyz;
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bezcv[14] = patchVertices[11].position.xyz;
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bezcv[15] = patchVertices[10].position.xyz;
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OsdEvalPatchBezierTessLevels(
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tessLevel,
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projectionMatrix,
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modelViewMatrix,
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bezcv,
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patchParam,
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tessLevelOuter,
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tessLevelInner,
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tessOuterLo,
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tessOuterHi
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);
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#else
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OsdGetTessLevelsUniform(
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tessLevel,
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patchParam,
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tessLevelOuter,
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tessLevelInner,
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tessOuterLo,
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tessOuterHi
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);
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#endif
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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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#if !USE_PTVS_FACTORS
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patchFactors.tessOuterLo = tessOuterLo;
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patchFactors.tessOuterHi = tessOuterHi;
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#endif
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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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OsdComputePerPatchGregoryFactors(
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patchParam,
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tessLevel,
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projectionMatrix,
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modelViewMatrix,
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patchVertices,
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#if !USE_PTVS_FACTORS
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osdBuffer.patchTessBuffer[patchID],
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#endif
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quadFactors
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);
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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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const float tessLevel,
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#if !USE_PTVS_FACTORS
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float4 tessOuterLo,
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float4 tessOuterHi,
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#endif
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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 domainCoord
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)
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{
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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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#if USE_PTVS_FACTORS
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float4 tessOuterLo(0), tessOuterHi(0);
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OsdGetTessLevelsUniform(tessLevel, patchParam, tessOuterLo, tessOuterHi);
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#endif
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float2 UV = OsdGetTessParameterization(domainCoord,
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tessOuterLo,
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tessOuterHi);
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OsdPatchVertex output;
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float3 P = float3(0), dPu = float3(0), dPv = float3(0);
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float3 N = float3(0), dNu = float3(0), dNv = float3(0);
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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.tessCoord = UV;
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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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tessLevel,
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#if !USE_PTVS_FACTORS
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#if USE_STAGE_IN
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osdPatch.tessOuterLo,
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osdPatch.tessOuterHi,
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#else
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osdBuffers.patchTessBuffer[patchID].tessOuterLo,
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osdBuffers.patchTessBuffer[patchID].tessOuterHi,
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#endif
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#endif
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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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