mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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501 lines
14 KiB
GLSL
501 lines
14 KiB
GLSL
//
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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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#version 420
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subroutine void computeKernelType();
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subroutine uniform computeKernelType computeKernel;
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uniform isamplerBuffer _F0_IT;
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uniform isamplerBuffer _F0_ITa;
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uniform isamplerBuffer _E0_IT;
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uniform isamplerBuffer _V0_IT;
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uniform isamplerBuffer _V0_ITa;
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uniform samplerBuffer _E0_S;
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uniform samplerBuffer _V0_S;
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uniform isamplerBuffer _editIndices;
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uniform samplerBuffer _editValues;
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layout(size1x32) uniform imageBuffer _vertexBufferImage;
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uniform int vertexOffset = 0; // vertex index offset for the batch
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uniform int tableOffset = 0; // offset of subdivision table
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uniform int indexStart = 0; // start index relative to tableOffset
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uniform int vertexBaseOffset = 0; // base vbo offset of the vertex buffer
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uniform int varyingBaseOffset = 0; // base vbo offset of the varying buffer
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uniform bool vertexPass;
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/*
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+-----+---------------------------------+-----
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n-1 | Level n |<batch range>| | n+1
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+-----+---------------------------------+-----
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^ ^
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vertexOffset |
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indexStart
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NUM_VERTEX_ELEMENTS = 3
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NUM_VARYING_ELEMENTS = 4
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VERTEX_STRIDE = VARYING_STRIDE = 7
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*/
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//--------------------------------------------------------------------------------
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struct Vertex
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{
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#if NUM_VERTEX_ELEMENTS > 0
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float vertexData[NUM_VERTEX_ELEMENTS];
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#endif
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#if NUM_VARYING_ELEMENTS > 0
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float varyingData[NUM_VARYING_ELEMENTS];
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#endif
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};
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#if NUM_VERTEX_ELEMENTS > 0
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uniform samplerBuffer vertexData; // float[NUM_VERTEX_ELEMENTS]
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#endif
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#if NUM_VARYING_ELEMENTS > 0
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uniform samplerBuffer varyingData; // float[NUM_VARYING_ELEMENTS]
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#endif
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// output feedback (mapped as a subrange of vertices)
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#if NUM_VERTEX_ELEMENTS > 0
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out float outVertexData[NUM_VERTEX_ELEMENTS];
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#endif
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#if NUM_VARYING_ELEMENTS > 0
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out float outVaryingData[NUM_VARYING_ELEMENTS];
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#endif
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void clear(out Vertex v)
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{
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#if NUM_VERTEX_ELEMENTS > 0
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for (int i = 0; i < NUM_VERTEX_ELEMENTS; i++) {
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v.vertexData[i] = 0;
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}
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#endif
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#if NUM_VARYING_ELEMENTS > 0
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for(int i = 0; i < NUM_VARYING_ELEMENTS; i++){
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v.varyingData[i] = 0;
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}
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#endif
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}
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Vertex readVertex(int index)
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{
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// XXX: should be split into two parts for addWithWeight and addVaryingWithWeight
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Vertex v;
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// unpacking
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#if NUM_VERTEX_ELEMENTS > 0
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int vertexIndex = index * VERTEX_STRIDE;
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for(int i = 0; i < NUM_VERTEX_ELEMENTS; i++) {
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v.vertexData[i] = texelFetch(vertexData, vertexIndex+i+vertexBaseOffset).x;
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}
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#endif
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#if NUM_VARYING_ELEMENTS > 0
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int varyingIndex = index * VARYING_STRIDE;
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for(int i = 0; i < NUM_VARYING_ELEMENTS; i++){
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v.varyingData[i] = texelFetch(varyingData, varyingIndex+i+varyingBaseOffset).x;
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}
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#endif
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return v;
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}
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void writeVertex(Vertex v)
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{
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// packing
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#if NUM_VERTEX_ELEMENTS > 0
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for(int i = 0; i < NUM_VERTEX_ELEMENTS; i++) {
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outVertexData[i] = v.vertexData[i];
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}
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#endif
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#if NUM_VARYING_ELEMENTS > 0
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for(int i = 0; i < NUM_VARYING_ELEMENTS; i++){
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outVaryingData[i] = v.varyingData[i];
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}
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#endif
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}
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void writeVertexByImageStore(Vertex v, int index)
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{
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#if NUM_VERTEX_ELEMENTS > 0
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int p = index * VERTEX_STRIDE + vertexBaseOffset;
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for(int i = 0; i < NUM_VERTEX_ELEMENTS; i++) {
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imageStore(_vertexBufferImage, p+i, vec4(v.vertexData[i], 0, 0, 0));
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}
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#endif
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}
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void addWithWeight(inout Vertex v, Vertex src, float weight)
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{
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#if NUM_VERTEX_ELEMENTS > 0
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for(int i = 0; i < NUM_VERTEX_ELEMENTS; i++) {
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v.vertexData[i] += weight * src.vertexData[i];
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}
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#endif
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}
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void addVaryingWithWeight(inout Vertex v, Vertex src, float weight)
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{
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#if NUM_VARYING_ELEMENTS > 0
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for(int i = 0; i < NUM_VARYING_ELEMENTS; i++){
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v.varyingData[i] += weight * src.varyingData[i];
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}
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#endif
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}
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//--------------------------------------------------------------------------------
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// Face-vertices compute Kernel
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subroutine(computeKernelType)
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void catmarkComputeFace()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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int h = texelFetch(_F0_ITa, 2*i).x;
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int n = texelFetch(_F0_ITa, 2*i+1).x;
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float weight = 1.0/n;
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Vertex dst;
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clear(dst);
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for(int j=0; j<n; ++j){
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int index = texelFetch(_F0_IT, h+j).x;
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addWithWeight(dst, readVertex(index), weight);
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addVaryingWithWeight(dst, readVertex(index), weight);
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}
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writeVertex(dst);
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}
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// Quad face-vertices compute Kernel
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subroutine(computeKernelType)
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void catmarkComputeQuadFace()
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{
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int i = gl_VertexID + indexStart;
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int fidx0 = texelFetch(_F0_IT, tableOffset + 4 * i + 0).x;
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int fidx1 = texelFetch(_F0_IT, tableOffset + 4 * i + 1).x;
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int fidx2 = texelFetch(_F0_IT, tableOffset + 4 * i + 2).x;
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int fidx3 = texelFetch(_F0_IT, tableOffset + 4 * i + 3).x;
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Vertex dst;
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clear(dst);
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addWithWeight(dst, readVertex(fidx0), 0.25);
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addWithWeight(dst, readVertex(fidx1), 0.25);
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addWithWeight(dst, readVertex(fidx2), 0.25);
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addWithWeight(dst, readVertex(fidx3), 0.25);
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addVaryingWithWeight(dst, readVertex(fidx0), 0.25);
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addVaryingWithWeight(dst, readVertex(fidx1), 0.25);
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addVaryingWithWeight(dst, readVertex(fidx2), 0.25);
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addVaryingWithWeight(dst, readVertex(fidx3), 0.25);
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writeVertex(dst);
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}
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// Tri-quad face-vertices compute Kernel
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subroutine(computeKernelType)
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void catmarkComputeTriQuadFace()
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{
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int i = gl_VertexID + indexStart;
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int fidx0 = texelFetch(_F0_IT, tableOffset + 4 * i + 0).x;
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int fidx1 = texelFetch(_F0_IT, tableOffset + 4 * i + 1).x;
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int fidx2 = texelFetch(_F0_IT, tableOffset + 4 * i + 2).x;
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int fidx3 = texelFetch(_F0_IT, tableOffset + 4 * i + 3).x;
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bool triangle = (fidx2 == fidx3);
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float weight = triangle ? 1.0f / 3.0f : 1.0f / 4.0f;
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Vertex dst;
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clear(dst);
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addWithWeight(dst, readVertex(fidx0), weight);
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addWithWeight(dst, readVertex(fidx1), weight);
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addWithWeight(dst, readVertex(fidx2), weight);
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addVaryingWithWeight(dst, readVertex(fidx0), weight);
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addVaryingWithWeight(dst, readVertex(fidx1), weight);
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addVaryingWithWeight(dst, readVertex(fidx2), weight);
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if (!triangle) {
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addWithWeight(dst, readVertex(fidx3), weight);
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addVaryingWithWeight(dst, readVertex(fidx3), weight);
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}
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writeVertex(dst);
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}
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// Edge-vertices compute Kernel
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subroutine(computeKernelType)
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void catmarkComputeEdge()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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Vertex dst;
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clear(dst);
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#ifdef OPT_E0_IT_VEC4
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ivec4 eidx = texelFetch(_E0_IT, i);
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#else
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int eidx0 = texelFetch(_E0_IT, 4*i+0).x;
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int eidx1 = texelFetch(_E0_IT, 4*i+1).x;
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int eidx2 = texelFetch(_E0_IT, 4*i+2).x;
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int eidx3 = texelFetch(_E0_IT, 4*i+3).x;
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ivec4 eidx = ivec4(eidx0, eidx1, eidx2, eidx3);
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#endif
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#ifdef OPT_E0_S_VEC2
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vec2 weight = texelFetch(_E0_S, i).xy;
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float vertWeight = weight.x;
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#else
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float vertWeight = texelFetch(_E0_S, i*2+0).x;
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#endif
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// Fully sharp edge : vertWeight = 0.5f;
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addWithWeight(dst, readVertex(eidx.x), vertWeight);
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addWithWeight(dst, readVertex(eidx.y), vertWeight);
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if(eidx.z != -1){
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#ifdef OPT_E0_S_VEC2
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float faceWeight = weight.y;
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#else
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float faceWeight = texelFetch(_E0_S, i*2+1).x;
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#endif
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addWithWeight(dst, readVertex(eidx.z), faceWeight);
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addWithWeight(dst, readVertex(eidx.w), faceWeight);
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}
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addVaryingWithWeight(dst, readVertex(eidx.x), 0.5f);
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addVaryingWithWeight(dst, readVertex(eidx.y), 0.5f);
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writeVertex(dst);
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}
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// Restricted edge-vertices compute Kernel
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subroutine(computeKernelType)
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void catmarkComputeRestrictedEdge()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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Vertex dst;
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clear(dst);
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#ifdef OPT_E0_IT_VEC4
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ivec4 eidx = texelFetch(_E0_IT, i);
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#else
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int eidx0 = texelFetch(_E0_IT, 4*i+0).x;
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int eidx1 = texelFetch(_E0_IT, 4*i+1).x;
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int eidx2 = texelFetch(_E0_IT, 4*i+2).x;
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int eidx3 = texelFetch(_E0_IT, 4*i+3).x;
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ivec4 eidx = ivec4(eidx0, eidx1, eidx2, eidx3);
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#endif
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addWithWeight(dst, readVertex(eidx.x), 0.25f);
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addWithWeight(dst, readVertex(eidx.y), 0.25f);
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addWithWeight(dst, readVertex(eidx.z), 0.25f);
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addWithWeight(dst, readVertex(eidx.w), 0.25f);
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addVaryingWithWeight(dst, readVertex(eidx.x), 0.5f);
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addVaryingWithWeight(dst, readVertex(eidx.y), 0.5f);
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writeVertex(dst);
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}
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// Edge-vertices compute Kernel (bilinear scheme)
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subroutine(computeKernelType)
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void bilinearComputeEdge()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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Vertex dst;
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clear(dst);
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#ifdef OPT_E0_IT_VEC4
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ivec2 eidx = texelFetch(_E0_IT, i).xy;
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#else
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ivec2 eidx = ivec2(texelFetch(_E0_IT, 2*i+0).x,
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texelFetch(_E0_IT, 2*i+1).x);
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#endif
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addWithWeight(dst, readVertex(eidx.x), 0.5f);
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addWithWeight(dst, readVertex(eidx.y), 0.5f);
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addVaryingWithWeight(dst, readVertex(eidx.x), 0.5f);
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addVaryingWithWeight(dst, readVertex(eidx.y), 0.5f);
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writeVertex(dst);
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}
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// Vertex-vertices compute Kernel (bilinear scheme)
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subroutine(computeKernelType)
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void bilinearComputeVertex()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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Vertex dst;
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clear(dst);
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int p = texelFetch(_V0_ITa, i).x;
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addWithWeight(dst, readVertex(p), 1.0f);
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addVaryingWithWeight(dst, readVertex(p), 1.0f);
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writeVertex(dst);
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}
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// Vertex-vertices compute Kernels 'A' / k_Crease and k_Corner rules
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subroutine(computeKernelType)
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void catmarkComputeVertexA()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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int vid = gl_VertexID + indexStart + vertexOffset;
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int n = texelFetch(_V0_ITa, 5*i+1).x;
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int p = texelFetch(_V0_ITa, 5*i+2).x;
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int eidx0 = texelFetch(_V0_ITa, 5*i+3).x;
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int eidx1 = texelFetch(_V0_ITa, 5*i+4).x;
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float weight = vertexPass
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? texelFetch(_V0_S, i).x
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: 1.0 - texelFetch(_V0_S, i).x;
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// In the case of fractional weight, the weight must be inverted since
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// the value is shared with the k_Smooth kernel (statistically the
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// k_Smooth kernel runs much more often than this one)
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if (weight>0.0 && weight<1.0 && n > 0)
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weight=1.0-weight;
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Vertex dst;
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if(! vertexPass)
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clear(dst);
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else
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dst = readVertex(vid);
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if (eidx0==-1 || (vertexPass==false && (n==-1)) ) {
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addWithWeight(dst, readVertex(p), weight);
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} else {
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addWithWeight(dst, readVertex(p), weight * 0.75f);
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addWithWeight(dst, readVertex(eidx0), weight * 0.125f);
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addWithWeight(dst, readVertex(eidx1), weight * 0.125f);
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}
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if(! vertexPass)
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addVaryingWithWeight(dst, readVertex(p), 1.0f);
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writeVertex(dst);
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}
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// Vertex-vertices compute Kernels 'B' / k_Dart and k_Smooth rules
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subroutine(computeKernelType)
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void catmarkComputeVertexB()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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int h = texelFetch(_V0_ITa, 5*i).x;
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#ifdef OPT_CATMARK_V_IT_VEC2
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int h2 = h/2;
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#endif
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int n = texelFetch(_V0_ITa, 5*i+1).x;
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int p = texelFetch(_V0_ITa, 5*i+2).x;
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float weight = texelFetch(_V0_S, i).x;
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float wp = 1.0/float(n*n);
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float wv = (n-2.0) * n * wp;
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Vertex dst;
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clear(dst);
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addWithWeight(dst, readVertex(p), weight * wv);
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for(int j = 0; j < n; ++j){
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#ifdef OPT_CATMARK_V_IT_VEC2
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ivec2 v0it = texelFetch(_V0_IT, h2+j).xy;
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addWithWeight(dst, readVertex(v0it.x), weight * wp);
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addWithWeight(dst, readVertex(v0it.y), weight * wp);
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#else
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addWithWeight(dst, readVertex(texelFetch(_V0_IT, h+j*2).x), weight * wp);
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addWithWeight(dst, readVertex(texelFetch(_V0_IT, h+j*2+1).x), weight * wp);
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#endif
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}
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addVaryingWithWeight(dst, readVertex(p), 1.0f);
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writeVertex(dst);
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}
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// Vertex-vertices compute Kernels 'B' / k_Dart and k_Smooth rules
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subroutine(computeKernelType)
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void loopComputeVertexB()
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{
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float PI = 3.14159265358979323846264;
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int i = gl_VertexID + indexStart + tableOffset;
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int h = texelFetch(_V0_ITa, 5*i).x;
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int n = texelFetch(_V0_ITa, 5*i+1).x;
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int p = texelFetch(_V0_ITa, 5*i+2).x;
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float weight = texelFetch(_V0_S, i).x;
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float wp = 1.0/n;
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float beta = 0.25 * cos(PI*2.0f*wp)+0.375f;
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beta = beta * beta;
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beta = (0.625f-beta)*wp;
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Vertex dst;
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clear(dst);
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addWithWeight(dst, readVertex(p), weight * (1.0-(beta*n)));
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for(int j = 0; j < n; ++j){
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addWithWeight(dst, readVertex(texelFetch(_V0_IT, h+j).x), weight * beta);
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}
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addVaryingWithWeight(dst, readVertex(p), 1.0f);
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writeVertex(dst);
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}
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// vertex edit kernel
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uniform int editPrimVarOffset;
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uniform int editPrimVarWidth;
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subroutine(computeKernelType)
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void editAdd()
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{
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int i = gl_VertexID + indexStart + tableOffset;
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int v = texelFetch(_editIndices, i).x;
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Vertex dst = readVertex(v + vertexOffset);
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// this is tricky. _editValues array contains editPrimVarWidth count of values.
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// i.e. if the vertex edit is just for pos Y, editPrimVarOffset = 1 and
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// editPrimVarWidth = 1, then _editValues will be an one element array.
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// below loops iterate over every elements regardless editing values to be applied or not,
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// so we need to make out-of-range edits ineffective.
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#if NUM_VERTEX_ELEMENTS > 0
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for (int j = 0; j < NUM_VERTEX_ELEMENTS; ++j) {
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int index = min(j-editPrimVarOffset, editPrimVarWidth-1);
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float editValue = texelFetch(_editValues, i*editPrimVarOffset + index).x;
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editValue *= float(j >= editPrimVarOffset);
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editValue *= float(j < (editPrimVarWidth + editPrimVarOffset));
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dst.vertexData[j] += editValue;
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}
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#endif
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writeVertexByImageStore(dst, v + vertexOffset);
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}
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void main()
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{
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// call subroutine
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computeKernel();
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}
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