112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
//
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// Copyright 2015 Pixar
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//
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// Licensed under the terms set forth in the LICENSE.txt file available at
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// https://opensubdiv.org/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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