AnotherFoxGuy/polyvox
1
0
Fork 0
Code Issues Pull Requests Activity

Work on OpenGL Example.

Browse Source
This commit is contained in:
David Williams
2009-04-20 21:00:28 +00:00
parent e87f84af86
commit d61827c365
3 changed files with 62 additions and 319 deletions
Download Patch File Download Diff File Expand all files Collapse all files

113
examples/OpenGL/OpenGLWidget.cpp
View File

@@ -12,11 +12,11 @@ using namespace std;
OpenGLWidget::OpenGLWidget(QWidget *parent)
:QGLWidget(parent)
,m_volData(0)
{
m_xRotation = 0;
m_yRotation = 0;
m_uRegionSideLength = 16.0f;
m_distance = -g_uVolumeSideLength / 2.0f;
timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(update()));
@@ -87,7 +87,8 @@ void OpenGLWidget::setVolume(PolyVox::Volume<PolyVox::uint8_t>* volData)
}
}
m_distance = m_volData->getLongestSideLength() / -2.0f;
//Projection matrix is dependant on volume size, so we need to set it up again.
setupProjectionMatrix();
}
}
@@ -124,66 +125,64 @@ void OpenGLWidget::initializeGL()
void OpenGLWidget::resizeGL(int w, int h)
{
glViewport ( 0, 0, w, h );
glMatrixMode ( GL_PROJECTION ); // Select The Projection Matrix
glLoadIdentity ( ); // Reset The Projection Matrix
//Setup the viewport based on the window size
glViewport(0, 0, w, h);
float aspect = ( float ) w / ( float ) h;
glOrtho(-m_distance*aspect, m_distance*aspect, -m_distance, m_distance, 1.0, 5000);
glMatrixMode ( GL_MODELVIEW ); // Select The Model View Matrix
glLoadIdentity ( ); // Reset The Model View Matrix
//Projection matrix is also dependant on the size of the current volume.
if(m_volData)
{
setupProjectionMatrix();
}
}
void OpenGLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glMatrixMode ( GL_MODELVIEW ); // Select The Model View Matrix
glLoadIdentity(); // Reset The Current Modelview Matrix
//Moves the camera back so we can see the volume
glTranslatef(0.0f, 0.0f, m_distance);
//Rotate the volume by the required amount
//glRotatef(g_xRotation, 1.0f, 0.0f, 0.0f);
//glRotatef(g_yRotation, 0.0f, 1.0f, 0.0f);
;
glRotatef(m_xRotation, 1.0f, 0.0f, 0.0f);
glRotatef(m_yRotation, 0.0f, 1.0f, 0.0f);
//Centre the volume on the origin
glTranslatef(-g_uVolumeSideLength/2,-g_uVolumeSideLength/2,-g_uVolumeSideLength/2);
for(PolyVox::uint16_t uRegionZ = 0; uRegionZ < m_uVolumeDepthInRegions; ++uRegionZ)
if(m_volData)
{
for(PolyVox::uint16_t uRegionY = 0; uRegionY < m_uVolumeHeightInRegions; ++uRegionY)
{
for(PolyVox::uint16_t uRegionX = 0; uRegionX < m_uVolumeWidthInRegions; ++uRegionX)
{
Vector3DUint8 v3dRegPos(uRegionX,uRegionY,uRegionZ);
if(m_bUseOpenGLVertexBufferObjects)
{
renderRegionVertexBufferObject(m_mapOpenGLSurfacePatches[v3dRegPos]);
}
else
{
IndexedSurfacePatch* ispCurrent = m_mapIndexedSurfacePatches[v3dRegPos];
renderRegionImmediateMode(*ispCurrent);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glMatrixMode(GL_MODELVIEW); // Select The Model View Matrix
glLoadIdentity(); // Reset The Current Modelview Matrix
//Moves the camera back so we can see the volume
glTranslatef(0.0f, 0.0f, -m_volData->getDiagonalLength());
glRotatef(m_xRotation, 1.0f, 0.0f, 0.0f);
glRotatef(m_yRotation, 0.0f, 1.0f, 0.0f);
//Centre the volume on the origin
glTranslatef(-g_uVolumeSideLength/2,-g_uVolumeSideLength/2,-g_uVolumeSideLength/2);
for(PolyVox::uint16_t uRegionZ = 0; uRegionZ < m_uVolumeDepthInRegions; ++uRegionZ)
{
for(PolyVox::uint16_t uRegionY = 0; uRegionY < m_uVolumeHeightInRegions; ++uRegionY)
{
for(PolyVox::uint16_t uRegionX = 0; uRegionX < m_uVolumeWidthInRegions; ++uRegionX)
{
Vector3DUint8 v3dRegPos(uRegionX,uRegionY,uRegionZ);
if(m_bUseOpenGLVertexBufferObjects)
{
renderRegionVertexBufferObject(m_mapOpenGLSurfacePatches[v3dRegPos]);
}
else
{
IndexedSurfacePatch* ispCurrent = m_mapIndexedSurfacePatches[v3dRegPos];
renderRegionImmediateMode(*ispCurrent);
}
}
}
}
GLenum errCode;
const GLubyte *errString;
if ((errCode = glGetError()) != GL_NO_ERROR)
{
errString = gluErrorString(errCode);
cout << "OpenGL Error: " << errString << endl;
}
}
GLenum errCode;
const GLubyte *errString;
if ((errCode = glGetError()) != GL_NO_ERROR)
{
errString = gluErrorString(errCode);
cout << "OpenGL Error: " << errString << endl;
} // Reset The Current Modelview Matrix
}
void OpenGLWidget::mousePressEvent(QMouseEvent* event)
@@ -203,5 +202,15 @@ void OpenGLWidget::mouseMoveEvent(QMouseEvent* event)
void OpenGLWidget::wheelEvent(QWheelEvent* event)
{
m_distance += event->delta() / 120.0f;
}
void OpenGLWidget::setupProjectionMatrix(void)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float frustumSize = m_volData->getDiagonalLength() / 2.0f;
float aspect = static_cast<float>(width()) / static_cast<float>(height());
glOrtho(frustumSize*aspect, -frustumSize*aspect, frustumSize, -frustumSize, 1.0, 5000);
}