mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
//
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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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#include "../osd/cpuGLVertexBuffer.h"
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#include "../osd/opengl.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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OsdCpuGLVertexBuffer::OsdCpuGLVertexBuffer(int numElements, int numVertices)
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: _numElements(numElements), _numVertices(numVertices),
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_vbo(0), _cpuBuffer(0), _dataDirty(true) {
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}
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OsdCpuGLVertexBuffer::~OsdCpuGLVertexBuffer() {
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delete[] _cpuBuffer;
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if (_vbo) {
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glDeleteBuffers(1, &_vbo);
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}
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}
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OsdCpuGLVertexBuffer *
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OsdCpuGLVertexBuffer::Create(int numElements, int numVertices) {
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OsdCpuGLVertexBuffer *instance =
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new OsdCpuGLVertexBuffer(numElements, numVertices);
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if (instance->allocate()) return instance;
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delete instance;
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return NULL;
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}
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void
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OsdCpuGLVertexBuffer::UpdateData(const float *src, int startVertex, int numVertices) {
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memcpy(_cpuBuffer + startVertex * GetNumElements(), src, GetNumElements() * numVertices * sizeof(float));
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_dataDirty = true;
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}
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int
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OsdCpuGLVertexBuffer::GetNumElements() const {
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return _numElements;
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}
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int
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OsdCpuGLVertexBuffer::GetNumVertices() const {
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return _numVertices;
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}
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float*
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OsdCpuGLVertexBuffer::BindCpuBuffer() {
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_dataDirty = true; // caller might modify data
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return _cpuBuffer;
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}
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GLuint
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OsdCpuGLVertexBuffer::BindVBO() {
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if (not _dataDirty)
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return _vbo;
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int size = GetNumElements() * GetNumVertices() * sizeof(float);
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if (not _vbo) {
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glGenBuffers(1, &_vbo);
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}
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glBindBuffer(GL_ARRAY_BUFFER, _vbo);
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glBufferData(GL_ARRAY_BUFFER, size, _cpuBuffer, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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_dataDirty = false;
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return _vbo;
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}
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bool
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OsdCpuGLVertexBuffer::allocate() {
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_cpuBuffer = new float[GetNumElements() * GetNumVertices()];
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_dataDirty = true;
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return true;
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}
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} // end namespace OPENSUBDIV_VERSION
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} // end namespace OpenSubdiv
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