mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-09 13:50:05 +00:00
28f2574bc5
This introduces an internal glLoader library which allows most of the implementation to be agnostic about the implementation of the GL loading library. Specifically, this removes references to the GLEW headers and libraries from the rest of the source code and build system.
129 lines
4.4 KiB
C++
129 lines
4.4 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 OPENSUBDIV_EXAMPLES_GL_SHARE_TOPOLOGY_VBO_H
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#define OPENSUBDIV_EXAMPLES_GL_SHARE_TOPOLOGY_VBO_H
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#include "glLoader.h"
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#include <opensubdiv/osd/bufferDescriptor.h>
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#include <vector>
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template <class VERTEX_BUFFER, class DEVICE_CONTEXT>
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class VBO {
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public:
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VBO(OpenSubdiv::Osd::BufferDescriptor const &vertexDesc,
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OpenSubdiv::Osd::BufferDescriptor const &varyingDesc,
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bool interleaved, int numVertices, DEVICE_CONTEXT *deviceContext) :
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_vertexDesc(vertexDesc),
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_varyingDesc(varyingDesc),
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_numVertices(numVertices),
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_vertexBuffer(NULL), _varyingBuffer(NULL), _interleaved(interleaved),
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_deviceContext(deviceContext) {
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if (interleaved) {
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assert(vertexDesc.stride == varyingDesc.stride);
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_vertexBuffer = createVertexBuffer(
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vertexDesc.stride, numVertices);
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} else {
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if (vertexDesc.stride > 0) {
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_vertexBuffer = createVertexBuffer(
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vertexDesc.stride, numVertices);
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}
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if (varyingDesc.stride > 0) {
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_varyingBuffer = createVertexBuffer(
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varyingDesc.stride, numVertices);
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}
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}
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}
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~VBO() {
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delete _vertexBuffer;
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delete _varyingBuffer;
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}
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OpenSubdiv::Osd::BufferDescriptor const &GetVertexDesc() const {
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return _vertexDesc;
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}
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OpenSubdiv::Osd::BufferDescriptor const &GetVaryingDesc() const {
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return _varyingDesc;
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}
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void UpdateVertexBuffer(int vertsOffset, std::vector<float> const &src) {
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updateVertexBuffer(_vertexBuffer, &src[0], vertsOffset,
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(int)src.size()/_vertexBuffer->GetNumElements());
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}
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void UpdateVaryingBuffer(int vertsOffset, std::vector<float> const &src) {
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updateVertexBuffer(_varyingBuffer, &src[0], vertsOffset,
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(int)src.size()/_varyingBuffer->GetNumElements());
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}
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GLuint BindVertexBuffer() {
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return _vertexBuffer->BindVBO();
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}
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GLuint BindVaryingBuffer() {
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return _varyingBuffer->BindVBO();
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}
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VERTEX_BUFFER *GetVertexBuffer() const {
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return _vertexBuffer;
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}
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VERTEX_BUFFER *GetVaryingBuffer() const {
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return _interleaved ? _vertexBuffer : _varyingBuffer;
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}
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size_t GetSize() const {
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size_t size = _numVertices * _vertexDesc.stride;
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if (_varyingBuffer) size += _numVertices * _varyingDesc.stride;
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return size * sizeof(float);
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}
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private:
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VERTEX_BUFFER *createVertexBuffer(int numElements, int numVertices) {
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return VERTEX_BUFFER::Create(numElements, numVertices, _deviceContext);
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}
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void updateVertexBuffer(VERTEX_BUFFER *vertexBuffer,
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const float *src, int startVertex,
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int numVertices) {
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vertexBuffer->UpdateData(src, startVertex, numVertices, _deviceContext);
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}
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OpenSubdiv::Osd::BufferDescriptor _vertexDesc;
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OpenSubdiv::Osd::BufferDescriptor _varyingDesc;
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// # of vertices total, including both control verts and refined verts.
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int _numVertices;
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VERTEX_BUFFER *_vertexBuffer;
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VERTEX_BUFFER *_varyingBuffer;
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bool _interleaved;
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DEVICE_CONTEXT *_deviceContext;
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};
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#endif // OPENSUBDIV_EXAMPLES_GL_SHARE_TOPOLOGY_VBO_H
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