mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-27 05:50:05 +00:00
f0128a5f5e
This change restores the use of 4-bits in Far::PatchParam to encode the refinement level of a patch. This restores one bit that was stolen to allow for more general encoding of boundary edge and transition edge masks. In order to accommodate all of the bits that are required, the transition edge mask bits are now stored along with the faceId bits. Also, accessors are now exposed directly as members of Far::PatchParam and the internal bitfield class is no longer directly exposed.
314 lines
9.2 KiB
Common Lisp
314 lines
9.2 KiB
Common Lisp
//
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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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struct Vertex {
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float v[LENGTH];
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};
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static void clear(struct Vertex *vertex) {
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for (int i = 0; i < LENGTH; i++) {
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vertex->v[i] = 0.0f;
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}
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}
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static void addWithWeight(struct Vertex *dst,
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__global float *srcOrigin,
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int index, float weight) {
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__global float *src = srcOrigin + index * SRC_STRIDE;
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for (int i = 0; i < LENGTH; ++i) {
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dst->v[i] += src[i] * weight;
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}
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}
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static void writeVertex(__global float *dstOrigin,
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int index,
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struct Vertex *src) {
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__global float *dst = dstOrigin + index * DST_STRIDE;
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for (int i = 0; i < LENGTH; ++i) {
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dst[i] = src->v[i];
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}
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}
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static void writeVertexStride(__global float *dstOrigin,
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int index,
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struct Vertex *src,
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int stride) {
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__global float *dst = dstOrigin + index * stride;
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for (int i = 0; i < LENGTH; ++i) {
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dst[i] = src->v[i];
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}
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}
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__kernel void computeStencils(
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__global float * src, int srcOffset,
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__global float * dst, int dstOffset,
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__global int * sizes,
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__global int * offsets,
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__global int * indices,
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__global float * weights,
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int batchStart, int batchEnd) {
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int current = get_global_id(0) + batchStart;
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if (current>=batchEnd) {
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return;
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}
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struct Vertex v;
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clear(&v);
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int size = sizes[current],
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offset = offsets[current];
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src += srcOffset;
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dst += dstOffset;
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for (int i=0; i<size; ++i) {
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addWithWeight(&v, src, indices[offset+i], weights[offset+i]);
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}
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writeVertex(dst, current, &v);
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}
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__kernel void computeStencilsDerivatives(
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__global float * src, int srcOffset,
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__global float * dst, int dstOffset,
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__global float * du, int duOffset, int duStride,
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__global float * dv, int dvOffset, int dvStride,
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__global int * sizes,
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__global int * offsets,
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__global int * indices,
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__global float * weights,
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__global float * duWeights,
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__global float * dvWeights,
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int batchStart, int batchEnd) {
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int current = get_global_id(0) + batchStart;
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if (current>=batchEnd) {
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return;
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}
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struct Vertex v, vdu, vdv;
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clear(&v);
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clear(&vdu);
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clear(&vdv);
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int size = sizes[current],
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offset = offsets[current];
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if (src) src += srcOffset;
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if (dst) dst += dstOffset;
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if (du) du += duOffset;
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if (dv) dv += dvOffset;
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for (int i=0; i<size; ++i) {
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int ofs = offset + i;
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int vid = indices[ofs];
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if (weights) addWithWeight( &v, src, vid, weights[ofs]);
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if (duWeights) addWithWeight(&vdu, src, vid, duWeights[ofs]);
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if (dvWeights) addWithWeight(&vdv, src, vid, dvWeights[ofs]);
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}
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if (dst) writeVertex (dst, current, &v);
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if (du) writeVertexStride(du, current, &vdu, duStride);
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if (dv) writeVertexStride(dv, current, &vdv, dvStride);
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}
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// ---------------------------------------------------------------------------
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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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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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static void getBSplineWeights(float t, float *point, float *deriv) {
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// The four uniform cubic B-Spline basis functions evaluated at t:
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float one6th = 1.0f / 6.0f;
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float t2 = t * t;
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float t3 = t * t2;
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point[0] = one6th * (1.0f - 3.0f*(t - t2) - t3);
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point[1] = one6th * (4.0f - 6.0f*t2 + 3.0f*t3);
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point[2] = one6th * (1.0f + 3.0f*(t + t2 - t3));
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point[3] = one6th * ( t3);
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// Derivatives of the above four basis functions at t:
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deriv[0] = -0.5f*t2 + t - 0.5f;
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deriv[1] = 1.5f*t2 - 2.0f*t;
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deriv[2] = -1.5f*t2 + t + 0.5f;
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deriv[3] = 0.5f*t2;
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}
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static void adjustBoundaryWeights(uint bits, float *sWeights, float *tWeights) {
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int boundary = ((bits >> 8) & 0xf);
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if (boundary & 1) {
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tWeights[2] -= tWeights[0];
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tWeights[1] += 2*tWeights[0];
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tWeights[0] = 0;
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}
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if (boundary & 2) {
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sWeights[1] -= sWeights[3];
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sWeights[2] += 2*sWeights[3];
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sWeights[3] = 0;
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}
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if (boundary & 4) {
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tWeights[1] -= tWeights[3];
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tWeights[2] += 2*tWeights[3];
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tWeights[3] = 0;
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}
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if (boundary & 8) {
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sWeights[2] -= sWeights[0];
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sWeights[1] += 2*sWeights[0];
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sWeights[0] = 0;
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}
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}
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static int getDepth(uint patchBits) {
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return (patchBits & 0xf);
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}
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static float getParamFraction(uint patchBits) {
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bool nonQuadRoot = (patchBits >> 4) & 0x1;
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int depth = getDepth(patchBits);
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if (nonQuadRoot) {
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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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static void normalizePatchCoord(uint patchBits, float *uv) {
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float frac = getParamFraction(patchBits);
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int iu = (patchBits >> 22) & 0x3ff;
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int 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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uv[0] = (uv[0] - pu) / frac;
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uv[1] = (uv[1] - pv) / frac;
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}
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__kernel void computePatches(__global float *src, int srcOffset,
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__global float *dst, int dstOffset,
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__global float *du, int duOffset, int duStride,
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__global float *dv, int dvOffset, int dvStride,
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__global struct PatchCoord *patchCoords,
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__global struct PatchArray *patchArrayBuffer,
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__global int *patchIndexBuffer,
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__global struct PatchParam *patchParamBuffer) {
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int current = get_global_id(0);
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if (src) src += srcOffset;
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if (dst) dst += dstOffset;
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if (du) du += duOffset;
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if (dv) dv += dvOffset;
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struct PatchCoord coord = patchCoords[current];
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struct PatchArray array = patchArrayBuffer[coord.arrayIndex];
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int patchType = 6; // array.patchType XXX: REGULAR only for now.
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int numControlVertices = 16;
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uint patchBits = patchParamBuffer[coord.patchIndex].field1;
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float uv[2] = {coord.s, coord.t};
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normalizePatchCoord(patchBits, uv);
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float dScale = (float)(1 << getDepth(patchBits));
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float wP[20], wDs[20], wDt[20];
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if (patchType == 6) { // REGULAR
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float sWeights[4], tWeights[4], dsWeights[4], dtWeights[4];
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getBSplineWeights(uv[0], sWeights, dsWeights);
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getBSplineWeights(uv[1], tWeights, dtWeights);
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adjustBoundaryWeights(patchBits, sWeights, tWeights);
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adjustBoundaryWeights(patchBits, dsWeights, dtWeights);
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for (int k = 0; k < 4; ++k) {
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for (int l = 0; l < 4; ++l) {
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wP[4*k+l] = sWeights[l] * tWeights[k];
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wDs[4*k+l] = dsWeights[l] * tWeights[k] * dScale;
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wDt[4*k+l] = sWeights[l] * dtWeights[k] * dScale;
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}
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}
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} else {
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// TODO: GREGORY BASIS
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}
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int indexBase = array.indexBase + coord.vertIndex;
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struct Vertex v;
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clear(&v);
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for (int i = 0; i < numControlVertices; ++i) {
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int index = patchIndexBuffer[indexBase + i];
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addWithWeight(&v, src, index, wP[i]);
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}
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writeVertex(dst, current, &v);
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if (du) {
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struct Vertex vdu;
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clear(&vdu);
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for (int i = 0; i < numControlVertices; ++i) {
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int index = patchIndexBuffer[indexBase + i];
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addWithWeight(&vdu, src, index, wDs[i]);
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}
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writeVertexStride(du, current, &vdu, duStride);
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}
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if (dv) {
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struct Vertex vdv;
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clear(&vdv);
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for (int i = 0; i < numControlVertices; ++i) {
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int index = patchIndexBuffer[indexBase + i];
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addWithWeight(&vdv, src, index, wDt[i]);
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}
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writeVertexStride(dv, current, &vdv, dvStride);
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}
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}
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