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multiindexedgeometry.cpp 8.73 KB
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// ================================================================================================
// 
// This file is part of the CAMPVis Software Framework.
// 
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// If not explicitly stated otherwise: Copyright (C) 2012-2014, all rights reserved,
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//      Christian Schulte zu Berge <christian.szb@in.tum.de>
//      Chair for Computer Aided Medical Procedures
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//      Technische Universitaet Muenchen
//      Boltzmannstr. 3, 85748 Garching b. Muenchen, Germany
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// 
// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
// except in compliance with the License. You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software distributed under the 
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
// either express or implied. See the License for the specific language governing permissions 
// and limitations under the License.
// 
// ================================================================================================

#include "multiindexedgeometry.h"

#include "tgt/assert.h"
#include "tgt/logmanager.h"
#include "tgt/buffer.h"
#include "tgt/vertexarrayobject.h"

#include <algorithm>
#include <list>
#include <utility>

namespace campvis {

    const std::string MultiIndexedGeometry::loggerCat_ = "CAMPVis.core.datastructures.MultiIndexedGeometry";


    MultiIndexedGeometry::MultiIndexedGeometry(
        const std::vector<tgt::vec3>& vertices, 
        const std::vector<tgt::vec3>& textureCoordinates /*= std::vector<tgt::vec3>()*/, 
        const std::vector<tgt::vec4>& colors /*= std::vector<tgt::vec4>()*/, 
        const std::vector<tgt::vec3>& normals /*= std::vector<tgt::vec3>() */)
        : GeometryData()
        , _vertices(vertices)
        , _textureCoordinates(textureCoordinates)
        , _colors(colors)
        , _normals(normals)
        , _indicesBuffer(0)
    {
        tgtAssert(textureCoordinates.empty() || textureCoordinates.size() == vertices.size(), "Texture coordinates vector must be either empty or of the same size as the vertex vector.");
        tgtAssert(colors.empty() || colors.size() == vertices.size(), "Colors vector must be either empty or of the same size as the vertex vector.");
        tgtAssert(normals.empty() || normals.size() == vertices.size(), "Normals vector must be either empty or of the same size as the vertex vector.");

    }

    MultiIndexedGeometry::MultiIndexedGeometry(const MultiIndexedGeometry& rhs)
        : GeometryData(rhs)
        , _indices(rhs._indices)
        , _offsets(rhs._offsets)
        , _counts(rhs._counts)
        , _vertices(rhs._vertices)
        , _textureCoordinates(rhs._textureCoordinates)
        , _colors(rhs._colors)
        , _normals(rhs._normals)
        , _indicesBuffer(0)
    {

    }

    MultiIndexedGeometry::~MultiIndexedGeometry() {
        deleteIndicesBuffer();
    }

    MultiIndexedGeometry& MultiIndexedGeometry::operator=(const MultiIndexedGeometry& rhs) {
        if (this == &rhs)
            return *this;

        GeometryData::operator=(rhs);
        _indices = rhs._indices;
        _offsets = rhs._offsets;
        _counts = rhs._counts;

        _vertices = rhs._vertices;
        _textureCoordinates = rhs._textureCoordinates;
        _colors = rhs._colors;
        _normals = rhs._normals;

        // delete old VBOs and null pointers
        deleteIndicesBuffer();

        return *this;
    }

    MultiIndexedGeometry* MultiIndexedGeometry::clone() const {
        MultiIndexedGeometry* toReturn = new MultiIndexedGeometry(_vertices, _textureCoordinates, _colors, _normals);
        toReturn->_indices = _indices;
        toReturn->_offsets = _offsets;
        toReturn->_counts = _counts;

        return toReturn;
    }

    size_t MultiIndexedGeometry::getLocalMemoryFootprint() const {
        size_t sum = 0;

        if (_indicesBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_verticesBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_texCoordsBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_colorsBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_normalsBuffer != 0)
            sum += sizeof(tgt::BufferObject);

        return sizeof(*this) + sum + (sizeof(size_t) * _indices.size()) + (sizeof(tgt::vec3) * (_vertices.size() + _textureCoordinates.size() + _normals.size())) + (sizeof(tgt::vec4) * _colors.size());
    }

    size_t MultiIndexedGeometry::getVideoMemoryFootprint() const {
        return GeometryData::getVideoMemoryFootprint() + (_indicesBuffer == 0 ? 0 : _indicesBuffer->getBufferSize());
    }

    void MultiIndexedGeometry::addPrimitive(const std::vector<uint16_t>& indices) {
        _offsets.push_back(reinterpret_cast<void*>(_indices.size() * 2));
        _counts.push_back(static_cast<GLsizei>(indices.size()));
        _indices.insert(_indices.end(), indices.begin(), indices.end());

        _buffersDirty = true;

    }

    void MultiIndexedGeometry::render(GLenum mode) const {
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        if (_counts.empty())
            return;

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        createGLBuffers();
        if (_buffersDirty) {
            LERROR("Cannot render without initialized OpenGL buffers.");
            return;
        }

        tgt::VertexArrayObject vao;
        if (_verticesBuffer)
            vao.setVertexAttributePointer(0, _verticesBuffer);
        if (_texCoordsBuffer)
            vao.setVertexAttributePointer(1, _texCoordsBuffer);
        if (_colorsBuffer)
            vao.setVertexAttributePointer(2, _colorsBuffer);
        if (_normalsBuffer)
            vao.setVertexAttributePointer(3, _normalsBuffer);
        vao.bindIndexBuffer(_indicesBuffer);

        const GLvoid** ptr = (const GLvoid**)(&_offsets.front()); // <- hidden reinterpret_cast<const GLvoid**> here, ugly OpenGL...
        glMultiDrawElements(mode, &_counts.front(), GL_UNSIGNED_SHORT, ptr, static_cast<GLsizei>(_offsets.size()));

        LGL_ERROR;
    }

    void MultiIndexedGeometry::createGLBuffers() const {
        if (_buffersDirty) {
            deleteBuffers();
            deleteIndicesBuffer();

            try {
                _indicesBuffer = new tgt::BufferObject(tgt::BufferObject::ELEMENT_ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                _indicesBuffer->data(&_indices.front(), _indices.size() * sizeof(uint16_t), tgt::BufferObject::UNSIGNED_SHORT, 1);

                _verticesBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                _verticesBuffer->data(&_vertices.front(), _vertices.size() * sizeof(tgt::vec3), tgt::BufferObject::FLOAT, 3);

                if (! _textureCoordinates.empty()) {
                    _texCoordsBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                    _texCoordsBuffer->data(&_textureCoordinates.front(), _textureCoordinates.size() * sizeof(tgt::vec3), tgt::BufferObject::FLOAT, 3);
                }
                if (! _colors.empty()) {
                    _colorsBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                    _colorsBuffer->data(&_colors.front(), _colors.size() * sizeof(tgt::vec4), tgt::BufferObject::FLOAT, 4);
                }
                if (! _normals.empty()) {
                    _normalsBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                    _normalsBuffer->data(&_normals.front(), _normals.size() * sizeof(tgt::vec3), tgt::BufferObject::FLOAT, 3);
                }
            }
            catch (tgt::Exception& e) {
                LERROR("Error creating OpenGL Buffer objects: " << e.what());
                _buffersDirty = true;
                return;
            }

            LGL_ERROR;
            _buffersDirty = false;
        }
    }

    tgt::Bounds MultiIndexedGeometry::getWorldBounds() const {
        tgt::Bounds toReturn;
        for (std::vector<tgt::vec3>::const_iterator it = _vertices.begin(); it != _vertices.end(); ++it)
            toReturn.addPoint(*it);
        return toReturn;
    }
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    bool MultiIndexedGeometry::hasTextureCoordinates() const {
        return ! _textureCoordinates.empty();
    }

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    void MultiIndexedGeometry::deleteIndicesBuffer() const {
        delete _indicesBuffer;
        _indicesBuffer = 0;
    }

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    void MultiIndexedGeometry::applyTransformationToVertices(const tgt::mat4& t) {
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        for (size_t i = 0; i < _vertices.size(); ++i) {
            tgt::vec4 tmp = t * tgt::vec4(_vertices[i], 1.f);
            _vertices[i] = tmp.xyz() / tmp.w;
        }

        _buffersDirty = true;
    }


}