mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
//
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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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#ifndef OPENSUBDIV3_OSD_BUFFER_DESCRIPTOR_H
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#define OPENSUBDIV3_OSD_BUFFER_DESCRIPTOR_H
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#include "../version.h"
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#include <string.h>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Osd {
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/// \brief BufferDescriptor is a struct which describes buffer elements in
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/// interleaved data buffers. Almost all Osd Evaluator APIs take
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/// BufferDescriptors along with device-specific buffer objects.
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///
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/// The offset of BufferDescriptor can also be used to express a
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/// batching offset if the data buffer is combined across multiple
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/// objects together.
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///
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/// * Note that each element has the same data type (float)
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///
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// example:
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// n
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// -----+----------------------------------------+-------------------------
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// | vertex 0 |
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// -----+----------------------------------------+-------------------------
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// | X Y Z R G B A Xu Yu Zu Xv Yv Zv |
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// -----+----------------------------------------+-------------------------
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// <------------- stride = 13 -------------->
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//
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// - XYZ (offset = n+0, length = 3, stride = 13)
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// - RGBA (offset = n+3, length = 4, stride = 13)
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// - uTangent (offset = n+7, length = 3, stride = 13)
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// - vTangent (offset = n+10, length = 3, stride = 13)
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//
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struct BufferDescriptor {
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/// Default Constructor
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BufferDescriptor() : offset(0), length(0), stride(0) { }
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/// Constructor
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BufferDescriptor(int o, int l, int s) : offset(o), length(l), stride(s) { }
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/// Returns the relative offset within a stride
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int GetLocalOffset() const {
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return stride > 0 ? offset % stride : 0;
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}
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/// True if the descriptor values are internally consistent
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bool IsValid() const {
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return ((length > 0) &&
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(length <= stride - GetLocalOffset()));
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}
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/// Resets the descriptor to default
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void Reset() {
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offset = length = stride = 0;
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}
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/// True if the descriptors are identical
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bool operator == (BufferDescriptor const &other) const {
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return (offset == other.offset &&
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length == other.length &&
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stride == other.stride);
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}
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/// True if the descriptors are not identical
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bool operator != (BufferDescriptor const &other) const {
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return !(this->operator==(other));
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}
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/// offset to desired element data
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int offset;
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/// number or length of the data
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int length;
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/// stride to the next element
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int stride;
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};
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} // end namespace Osd
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} // end namespace OPENSUBDIV_VERSION
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using namespace OPENSUBDIV_VERSION;
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} // end namespace OpenSubdiv
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#endif // OPENSUBDIV3_OSD_BUFFER_DESCRIPTOR_H
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