SWBF2-Classic-Msh-Viewer/MeshViewerQt/Source/OpenGlViewer.cpp

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#include "..\Header\OpenGlViewer.h"
#include <cmath>
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#include <iostream>
#include <QMessageBox>
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/////////////////////////////////////////////////////////////////////////
// Defined values
//opengl
#define DEFAULT_MAJOR_VERSION 4
#define DEFAULT_MINOR_VERSION 5
#define DEAFAULT_BACKGROUND 0.5000f, 0.8000f, 1.0000f, 0.0000f
//piplines
#define VERTEX_INDEX_XYZ 0
#define VERTEX_INDEX_UV 1
#define VERTEX_COMPONENTS_XYZ 3
#define VERTEX_COMPONENTS_UV 2
#define VERTEX_SIZE_XYZ (sizeof(float) * VERTEX_COMPONENTS_XYZ)
#define VERTEX_SIZE_UV (sizeof(float) * VERTEX_COMPONENTS_UV)
#define VERTEX_OFFSET_XYZ 0
#define VERTEX_OFFSET_UV (VERTEX_SIZE_XYZ)
/////////////////////////////////////////////////////////////////////////
// public constructor/destructor
OpenGlViewer::OpenGlViewer(QWidget *parent)
: QOpenGLWidget(parent)
{
QSurfaceFormat format;
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format.setRenderableType(QSurfaceFormat::OpenGL);
format.setSamples(4);
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format.setProfile(QSurfaceFormat::CoreProfile);
format.setVersion(DEFAULT_MAJOR_VERSION, DEFAULT_MINOR_VERSION);
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setFormat(format);
//TODO: mouse, move, key, drag/drop, scroll, resize
}
OpenGlViewer::~OpenGlViewer()
{
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glDeleteTextures(1, &m_oglTexture);
glDeleteBuffers(1, &m_vertexBuffer);
m_vertexArray.destroy();
delete m_program;
deleteData();
}
/////////////////////////////////////////////////////////////////////////
// private functions
void OpenGlViewer::initializeGL()
{
initializeOpenGLFunctions();
printContextInformation();
// set Background
glClearColor(DEAFAULT_BACKGROUND);
//TODO: z-order?
// draw vertices only from one side
glEnable(GL_CULL_FACE);
// Create texture
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glGenTextures(1, &m_oglTexture);
glBindTexture(GL_TEXTURE_2D, m_oglTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
// Create Shader
m_program = new QOpenGLShaderProgram();
m_program->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/simple.vert");
m_program->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/simple.frag");
m_program->link();
m_program->bind();
// get Uniform location
//TODO: faster to give everything to shader and calculate there?
m_uniformMVP = m_program->uniformLocation("MVP");
// Create Vertex Buffer
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glGenBuffers(1, &m_vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_vertexBuffer);
// Create Vertex Array Object
m_vertexArray.create();
m_vertexArray.bind();
m_program->enableAttributeArray(0);
m_program->enableAttributeArray(1);
m_program->setAttributeBuffer(VERTEX_INDEX_XYZ, GL_FLOAT, VERTEX_OFFSET_XYZ, VERTEX_COMPONENTS_XYZ, sizeof(Vertex));
m_program->setAttributeBuffer(VERTEX_INDEX_UV, GL_FLOAT, VERTEX_OFFSET_UV, VERTEX_COMPONENTS_UV, sizeof(Vertex));
// unbind everything
m_vertexArray.release();
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glBindBuffer(GL_ARRAY_BUFFER, 0);
m_program->release();
}
void OpenGlViewer::paintGL()
{
//TODO: paint here
glClear(GL_COLOR_BUFFER_BIT);
m_program->bind();
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glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, m_oglTexture);
m_program->setUniformValue("textureSampler", 0);
if (m_vModels != nullptr)
{
int tmp_offset(0);
for (unsigned int modelIndex = 0; modelIndex < m_vModels->size(); modelIndex++)
{
// skip null, bones, shadowMesh, hidden things
if (m_vModels->at(modelIndex)->type == null ||
m_vModels->at(modelIndex)->type == bone ||
m_vModels->at(modelIndex)->type == shadowMesh ||
m_vModels->at(modelIndex)->renderFlags == 1)
continue;
for (auto& segmentIterator : m_vModels->at(modelIndex)->segmList)
{
// set the texture
std::uint32_t tmp_textureIndex = segmentIterator->textureIndex >= m_vTextures->size() ? m_vTextures->size() - 1 : segmentIterator->textureIndex;
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glTexImage2D(
GL_TEXTURE_2D,
0,
m_vTextures->at(tmp_textureIndex)->alpha ? GL_RGBA : GL_RGB,
m_vTextures->at(tmp_textureIndex)->width,
m_vTextures->at(tmp_textureIndex)->height,
0,
m_vTextures->at(tmp_textureIndex)->alpha ? GL_BGRA : GL_BGR,
GL_UNSIGNED_BYTE,
m_vTextures->at(tmp_textureIndex)->data->data()
);
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glGenerateMipmap(GL_TEXTURE_2D);
// give the MVP to the shader
m_program->setUniformValue(m_uniformMVP, getMVPMatrix(modelIndex));
// calculate the number of vertex
unsigned int tmp_vertexCount(0);
for (auto&it : segmentIterator->polyIndices)
tmp_vertexCount += (it.size() - 2) * 3;
glDrawArrays(GL_TRIANGLES, tmp_offset, tmp_vertexCount);
// increase the offset
tmp_offset += tmp_vertexCount;
}
}
}
m_program->release();
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this->frameSwapped();
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}
void OpenGlViewer::printContextInformation()
{
QString glType;
QString glVersion;
QString glProfile;
glType = (context()->isOpenGLES()) ? "OpenGL ES" : "OpenGL";
glVersion = reinterpret_cast<const char*>(glGetString(GL_VERSION));
#define CASE(c) case QSurfaceFormat::c: glProfile = #c; break
switch (format().profile())
{
CASE(NoProfile);
CASE(CoreProfile);
CASE(CompatibilityProfile);
}
#undef CASE
std::cout << glType.toStdString() << " - " << glVersion.toStdString() << " (" << glProfile.toStdString() << ")";
}
QMatrix4x4 OpenGlViewer::getModelMatrix(unsigned int index) const
{
QMatrix4x4 tmp_parent;
for (unsigned int loop = 0; loop < m_vModels->size(); loop++)
{
if (!strcmp(m_vModels->at(index)->parent.c_str(), m_vModels->at(loop)->name.c_str()))
{
tmp_parent = getModelMatrix(loop);
break;
}
}
return tmp_parent * m_vModels->at(index)->m4x4Translation;
}
QMatrix4x4 OpenGlViewer::getMVPMatrix(unsigned int index) const
{
QMatrix4x4 tmp_mvp;
// projection
tmp_mvp.perspective(m_fFOV, float(QWidget::width()) / float(QWidget::height()), m_fMinView, m_fMaxView);
// view
tmp_mvp.lookAt(QVector3D(m_fTranX, m_fTranY, m_fTranZ), QVector3D(m_fTranX, m_fTranY, m_fTranZ - 1), QVector3D(0, 0, 1));
// user controlled rotation
tmp_mvp.rotate(m_fRotX, QVector3D(1, 0, 0));
tmp_mvp.rotate(m_fRotY, QVector3D(0, 1, 0));
tmp_mvp.rotate(m_fRotZ, QVector3D(0, 0, 1));
//scale to 1
float maxExtent = std::max(std::max(m_sceneBoundings.extents[0], m_sceneBoundings.extents[1]), m_sceneBoundings.extents[2]);
tmp_mvp.scale(1 / maxExtent);
// move to center
tmp_mvp.translate(-m_sceneBoundings.center[0], -m_sceneBoundings.center[1], -m_sceneBoundings.center[2]);
return tmp_mvp * getModelMatrix(index);
}
void OpenGlViewer::deleteData()
{
if (m_vModels != nullptr)
{
while (!m_vModels->empty())
{
// remove the last Model
Model* modelVectorElement = m_vModels->back();
m_vModels->pop_back();
while (!modelVectorElement->segmList.empty())
{
// remove the last Segment
Segment* segmentVectorElement = modelVectorElement->segmList.back();
modelVectorElement->segmList.pop_back();
// delete data from Segment
delete[] segmentVectorElement->uv;
delete[] segmentVectorElement->vertex;
while (!segmentVectorElement->polyIndices.empty())
{
// clear the poly vector and remove it from the list
segmentVectorElement->polyIndices.back().clear();
segmentVectorElement->polyIndices.pop_back();
}
// delete the actual Segment
delete segmentVectorElement;
}
// delete the actual Model
delete modelVectorElement;
}
// delete the Model's Vector
delete m_vModels;
}
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if (m_vTextures != nullptr)
{
while (!m_vTextures->empty())
{
// remove the last texture
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TextureData* cursor = m_vTextures->back();
m_vTextures->pop_back();
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cursor->data->clear();
delete cursor->data;
//delete image
delete cursor;
}
// delete the Textrue's Vector
delete m_vTextures;
}
}
/////////////////////////////////////////////////////////////////////////
// public functions
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void OpenGlViewer::setData(std::vector<Model*>* models, std::vector<TextureData*>* textures, BoundingBox bbox)
{
// new Data, so clean up the old things
deleteData();
// save the variables
m_vModels = models;
m_vTextures = textures;
m_sceneBoundings = bbox;
// collect vertex data of all models
std::vector<Vertex> tmp_bufferData;
for (auto& modIt : *m_vModels) // for every model chunk
{
for (auto& segIt : modIt->segmList) // for every cluster
{
for (auto& mshIt : segIt->polyIndices) // for every polygon
{
if (mshIt.size() >= 3) // multipoly
{
// for every triangle of the multi polygon
for (unsigned int tri = 0; tri < mshIt.size() - 2; tri++)
{
// for every edge of the triangle
for (int triEdge = 0; triEdge < 3; triEdge++)
{
Vertex tempVertex;
// every edge has 3 coordinates
for (int j = 0; j < 3; j++)
tempVertex.position[j] = (GLfloat)segIt->vertex[mshIt[tri + triEdge - ((tri % 2) * (triEdge - 1) * 2)] * 3 + j];
// and 2 UV
if (segIt->uv == NULL)
{
tempVertex.uv[0] = 1.0;
tempVertex.uv[1] = 1.0;
}
else
{
for (int j = 0; j < 2; j++)
tempVertex.uv[j] = (GLfloat)segIt->uv[mshIt[tri + triEdge - ((tri % 2) * (triEdge - 1) * 2)] * 2 + j];
}
tmp_bufferData.push_back(tempVertex);
}
}
}
else // this shouldn't happen (polygon with less then 3 vertex)
{
deleteData();
QMessageBox msg(this);
msg.addButton(QMessageBox::Ok);
msg.setText("You have polygons with less then 3 vertices!");
msg.setIcon(QMessageBox::Critical);
msg.setWindowTitle("Open File Error");
msg.exec();
return;
}
}
}
}
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glBindBuffer(GL_ARRAY_BUFFER, m_vertexBuffer);
glBufferData(
GL_ARRAY_BUFFER,
sizeof(Vertex) * tmp_bufferData.size(),
tmp_bufferData.data(),
GL_STATIC_DRAW
);
glBindBuffer(GL_ARRAY_BUFFER, 0);
tmp_bufferData.clear();
}