mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-09-20 06:40:11 +00:00
fe38ad8cda
Now that Far::LimitStencilTable and Far::PatchTable support evaluation of 1st and 2nd derivatives the Osd Evaluator API for evaluating stencils and patches has been updated to match.
389 lines
11 KiB
GLSL
389 lines
11 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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//------------------------------------------------------------------------------
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layout(local_size_x=WORK_GROUP_SIZE, local_size_y=1, local_size_z=1) in;
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layout(std430) buffer;
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// source and destination buffers
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uniform int srcOffset = 0;
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uniform int dstOffset = 0;
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layout(binding=0) buffer src_buffer { float srcVertexBuffer[]; };
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layout(binding=1) buffer dst_buffer { float dstVertexBuffer[]; };
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// derivative buffers (if needed)
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_1ST_DERIVATIVES)
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uniform ivec3 duDesc;
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uniform ivec3 dvDesc;
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layout(binding=2) buffer du_buffer { float duBuffer[]; };
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layout(binding=3) buffer dv_buffer { float dvBuffer[]; };
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#endif
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_2ND_DERIVATIVES)
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uniform ivec3 duuDesc;
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uniform ivec3 duvDesc;
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uniform ivec3 dvvDesc;
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layout(binding=10) buffer duu_buffer { float duuBuffer[]; };
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layout(binding=11) buffer duv_buffer { float duvBuffer[]; };
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layout(binding=12) buffer dvv_buffer { float dvvBuffer[]; };
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#endif
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// stencil buffers
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#if defined(OPENSUBDIV_GLSL_COMPUTE_KERNEL_EVAL_STENCILS)
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uniform int batchStart = 0;
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uniform int batchEnd = 0;
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layout(binding=4) buffer stencilSizes { int _sizes[]; };
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layout(binding=5) buffer stencilOffsets { int _offsets[]; };
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layout(binding=6) buffer stencilIndices { int _indices[]; };
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layout(binding=7) buffer stencilWeights { float _weights[]; };
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_1ST_DERIVATIVES)
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layout(binding=8) buffer stencilDuWeights { float _duWeights[]; };
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layout(binding=9) buffer stencilDvWeights { float _dvWeights[]; };
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#endif
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_2ND_DERIVATIVES)
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layout(binding=13) buffer stencilDuuWeights { float _duuWeights[]; };
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layout(binding=14) buffer stencilDuvWeights { float _duvWeights[]; };
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layout(binding=15) buffer stencilDvvWeights { float _dvvWeights[]; };
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#endif
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#endif
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// patch buffers
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#if defined(OPENSUBDIV_GLSL_COMPUTE_KERNEL_EVAL_PATCHES)
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struct PatchCoord {
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int arrayIndex;
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int patchIndex;
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int vertIndex;
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float s;
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float t;
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};
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struct PatchParam {
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uint field0;
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uint field1;
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float sharpness;
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};
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uniform ivec4 patchArray[2];
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layout(binding=4) buffer patchCoord_buffer { PatchCoord patchCoords[]; };
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layout(binding=5) buffer patchIndex_buffer { int patchIndexBuffer[]; };
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layout(binding=6) buffer patchParam_buffer { PatchParam patchParamBuffer[]; };
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#endif
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//------------------------------------------------------------------------------
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struct Vertex {
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float vertexData[LENGTH];
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};
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void clear(out Vertex v) {
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for (int i = 0; i < LENGTH; ++i) {
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v.vertexData[i] = 0;
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}
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}
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Vertex readVertex(int index) {
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Vertex v;
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int vertexIndex = srcOffset + index * SRC_STRIDE;
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for (int i = 0; i < LENGTH; ++i) {
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v.vertexData[i] = srcVertexBuffer[vertexIndex + i];
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}
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return v;
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}
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void writeVertex(int index, Vertex v) {
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int vertexIndex = dstOffset + index * DST_STRIDE;
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for (int i = 0; i < LENGTH; ++i) {
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dstVertexBuffer[vertexIndex + i] = v.vertexData[i];
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}
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}
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void addWithWeight(inout Vertex v, const Vertex src, float weight) {
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for (int i = 0; i < LENGTH; ++i) {
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v.vertexData[i] += weight * src.vertexData[i];
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}
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}
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_1ST_DERIVATIVES)
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void writeDu(int index, Vertex du) {
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int duIndex = duDesc.x + index * duDesc.z;
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for (int i = 0; i < LENGTH; ++i) {
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duBuffer[duIndex + i] = du.vertexData[i];
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}
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}
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void writeDv(int index, Vertex dv) {
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int dvIndex = dvDesc.x + index * dvDesc.z;
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for (int i = 0; i < LENGTH; ++i) {
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dvBuffer[dvIndex + i] = dv.vertexData[i];
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}
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}
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#endif
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_2ND_DERIVATIVES)
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void writeDuu(int index, Vertex duu) {
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int duuIndex = duuDesc.x + index * duuDesc.z;
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for (int i = 0; i < LENGTH; ++i) {
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duuBuffer[duuIndex + i] = duu.vertexData[i];
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}
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}
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void writeDuv(int index, Vertex duv) {
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int duvIndex = duvDesc.x + index * duvDesc.z;
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for (int i = 0; i < LENGTH; ++i) {
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duvBuffer[duvIndex + i] = duv.vertexData[i];
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}
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}
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void writeDvv(int index, Vertex dvv) {
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int dvvIndex = dvvDesc.x + index * dvvDesc.z;
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for (int i = 0; i < LENGTH; ++i) {
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dvvBuffer[dvvIndex + i] = dvv.vertexData[i];
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}
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}
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#endif
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//------------------------------------------------------------------------------
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#if defined(OPENSUBDIV_GLSL_COMPUTE_KERNEL_EVAL_STENCILS)
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void main() {
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int current = int(gl_GlobalInvocationID.x) + batchStart;
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if (current>=batchEnd) {
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return;
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}
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Vertex dst;
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clear(dst);
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int offset = _offsets[current],
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size = _sizes[current];
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for (int stencil = 0; stencil < size; ++stencil) {
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int vindex = offset + stencil;
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addWithWeight(
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dst, readVertex(_indices[vindex]), _weights[vindex]);
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}
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writeVertex(current, dst);
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_1ST_DERIVATIVES)
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Vertex du, dv;
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clear(du);
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clear(dv);
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for (int i=0; i<size; ++i) {
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// expects the compiler optimizes readVertex out here.
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Vertex src = readVertex(_indices[offset+i]);
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addWithWeight(du, src, _duWeights[offset+i]);
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addWithWeight(dv, src, _dvWeights[offset+i]);
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}
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if (duDesc.y > 0) { // length
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writeDu(current, du);
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}
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if (dvDesc.y > 0) {
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writeDv(current, dv);
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}
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#endif
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_2ND_DERIVATIVES)
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Vertex duu, duv, dvv;
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clear(duu);
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clear(duv);
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clear(dvv);
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for (int i=0; i<size; ++i) {
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// expects the compiler optimizes readVertex out here.
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Vertex src = readVertex(_indices[offset+i]);
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addWithWeight(duu, src, _duuWeights[offset+i]);
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addWithWeight(duv, src, _duvWeights[offset+i]);
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addWithWeight(dvv, src, _dvvWeights[offset+i]);
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}
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if (duuDesc.y > 0) { // length
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writeDuu(current, duu);
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}
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if (duvDesc.y > 0) {
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writeDuv(current, duv);
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}
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if (dvvDesc.y > 0) {
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writeDvv(current, dvv);
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}
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#endif
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}
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#endif
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//------------------------------------------------------------------------------
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#if defined(OPENSUBDIV_GLSL_COMPUTE_KERNEL_EVAL_PATCHES)
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// PERFORMANCE: stride could be constant, but not as significant as length
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//struct PatchArray {
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// int patchType;
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// int numPatches;
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// int indexBase; // an offset within the index buffer
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// int primitiveIdBase; // an offset within the patch param buffer
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//};
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// # of patcharrays is 1 or 2.
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uint getDepth(uint patchBits) {
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return (patchBits & 0xf);
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}
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float getParamFraction(uint patchBits) {
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uint nonQuadRoot = (patchBits >> 4) & 0x1;
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uint depth = getDepth(patchBits);
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if (nonQuadRoot == 1) {
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return 1.0f / float( 1 << (depth-1) );
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} else {
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return 1.0f / float( 1 << depth );
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}
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}
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vec2 normalizePatchCoord(uint patchBits, vec2 uv) {
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float frac = getParamFraction(patchBits);
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uint iu = (patchBits >> 22) & 0x3ff;
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uint iv = (patchBits >> 12) & 0x3ff;
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// top left corner
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float pu = float(iu*frac);
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float pv = float(iv*frac);
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// normalize u,v coordinates
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return vec2((uv.x - pu) / frac, (uv.y - pv) / frac);
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}
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bool isRegular(uint patchBits) {
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return (((patchBits >> 5) & 0x1u) != 0);
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}
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int getNumControlVertices(int patchType) {
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return (patchType == 3) ? 4 :
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(patchType == 6) ? 16 :
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(patchType == 9) ? 20 : 0;
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}
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void main() {
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int current = int(gl_GlobalInvocationID.x);
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PatchCoord coord = patchCoords[current];
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int patchIndex = coord.patchIndex;
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ivec4 array = patchArray[coord.arrayIndex];
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uint patchBits = patchParamBuffer[patchIndex].field1;
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int patchType = isRegular(patchBits) ? 6 : array.x;
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vec2 uv = normalizePatchCoord(patchBits, vec2(coord.s, coord.t));
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float dScale = float(1 << getDepth(patchBits));
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int boundary = int((patchBits >> 8) & 0xfU);
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float wP[20], wDs[20], wDt[20], wDss[20], wDst[20], wDtt[20];
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int numControlVertices = 0;
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if (patchType == 3) {
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float wP4[4], wDs4[4], wDt4[4], wDss4[4], wDst4[4], wDtt4[4];
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OsdGetBilinearPatchWeights(uv.s, uv.t, dScale, wP4, wDs4, wDt4, wDss4, wDst4, wDtt4);
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numControlVertices = 4;
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for (int i=0; i<numControlVertices; ++i) {
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wP[i] = wP4[i];
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wDs[i] = wDs4[i];
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wDt[i] = wDt4[i];
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wDss[i] = wDss4[i];
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wDst[i] = wDst4[i];
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wDtt[i] = wDtt4[i];
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}
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} else if (patchType == 6) {
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float wP16[16], wDs16[16], wDt16[16], wDss16[16], wDst16[16], wDtt16[16];
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OsdGetBSplinePatchWeights(uv.s, uv.t, dScale, boundary, wP16, wDs16, wDt16, wDss16, wDst16, wDtt16);
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numControlVertices = 16;
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for (int i=0; i<numControlVertices; ++i) {
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wP[i] = wP16[i];
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wDs[i] = wDs16[i];
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wDt[i] = wDt16[i];
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wDss[i] = wDss16[i];
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wDst[i] = wDst16[i];
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wDtt[i] = wDtt16[i];
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}
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} else if (patchType == 9) {
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OsdGetGregoryPatchWeights(uv.s, uv.t, dScale, wP, wDs, wDt, wDss, wDst, wDtt);
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numControlVertices = 20;
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}
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Vertex dst, du, dv, duu, duv, dvv;
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clear(dst);
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clear(du);
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clear(dv);
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clear(duu);
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clear(duv);
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clear(dvv);
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int indexStride = getNumControlVertices(array.x);
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int indexBase = array.z + indexStride * (patchIndex - array.w);
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for (int cv = 0; cv < numControlVertices; ++cv) {
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int index = patchIndexBuffer[indexBase + cv];
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addWithWeight(dst, readVertex(index), wP[cv]);
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addWithWeight(du, readVertex(index), wDs[cv]);
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addWithWeight(dv, readVertex(index), wDt[cv]);
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addWithWeight(duu, readVertex(index), wDss[cv]);
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addWithWeight(duv, readVertex(index), wDst[cv]);
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addWithWeight(dvv, readVertex(index), wDtt[cv]);
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}
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writeVertex(current, dst);
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_1ST_DERIVATIVES)
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if (duDesc.y > 0) { // length
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writeDu(current, du);
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}
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if (dvDesc.y > 0) {
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writeDv(current, dv);
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}
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#endif
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#if defined(OPENSUBDIV_GLSL_COMPUTE_USE_2ND_DERIVATIVES)
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if (duuDesc.y > 0) { // length
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writeDuu(current, duu);
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}
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if (duvDesc.y > 0) { // length
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writeDuv(current, duv);
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}
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if (dvvDesc.y > 0) {
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writeDvv(current, dvv);
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}
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#endif
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}
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#endif
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