//------------------------------------------------------------------------------
//
void GLPickingSelect::processBoundingBox(
const SubNode::Ptr rootNode,
const double seconds
)
{
// Allocate select buffer.
const unsigned int bufferSize = 12;
GLuint buffer[12*4];
// Get the current viewport.
M3dView view = fSelectInfo.view();
// Get the bounding box.
MBoundingBox boundingBox = BoundingBoxVisitor::boundingBox(rootNode, seconds);
// Draw the bounding box.
view.beginSelect(buffer, bufferSize*4);
view.pushName(0);
{
VBOProxy vboProxy;
vboProxy.drawBoundingBox(boundingBox);
}
view.popName();
int nbPick = view.endSelect();
// Determine the closest point.
if (nbPick > 0) {
unsigned int Zdepth = closestElem(nbPick, buffer);
float depth = float(Zdepth)/MAX_HW_DEPTH_VALUE;
fMinZ = std::min(depth,fMinZ);
}
}
//------------------------------------------------------------------------------
//
void GLPickingSelect::processTriangles(
const SubNode::Ptr rootNode,
const double seconds,
const size_t numTriangles,
VBOProxy::VBOMode vboMode
)
{
const unsigned int bufferSize = (unsigned int)std::min(numTriangles,size_t(100000));
boost::shared_array<GLuint>buffer (new GLuint[bufferSize*4]);
M3dView view = fSelectInfo.view();
MMatrix projMatrix;
view.projectionMatrix(projMatrix);
MMatrix modelViewMatrix;
view.modelViewMatrix(modelViewMatrix);
unsigned int x, y, w, h;
view.viewport(x, y, w, h);
double viewportX = static_cast<int>(x); // can be less than 0
double viewportY = static_cast<int>(y); // can be less than 0
double viewportW = w;
double viewportH = h;
fSelectInfo.selectRect(x, y, w, h);
double selectX = static_cast<int>(x); // can be less than 0
double selectY = static_cast<int>(y); // can be less than 0
double selectW = w;
double selectH = h;
MMatrix selectAdjustMatrix;
selectAdjustMatrix[0][0] = viewportW / selectW;
selectAdjustMatrix[1][1] = viewportH / selectH;
selectAdjustMatrix[3][0] = ((viewportX + viewportW/2.0) - (selectX + selectW/2.0)) /
viewportW * 2.0 * selectAdjustMatrix[0][0];
selectAdjustMatrix[3][1] = ((viewportY + viewportH/2.0) - (selectY + selectH/2.0)) /
viewportH * 2.0 * selectAdjustMatrix[1][1];
MMatrix localToPort = modelViewMatrix * projMatrix * selectAdjustMatrix;
view.beginSelect(buffer.get(), bufferSize*4);
view.pushName(0);
{
Frustum frustum(localToPort.inverse());
MMatrix xform(modelViewMatrix);
DrawShadedState state(frustum, seconds, vboMode);
DrawShadedTraversal traveral(state, xform, false, Frustum::kUnknown);
rootNode->accept(traveral);
}
view.popName();
int nbPick = view.endSelect();
if (nbPick > 0) {
unsigned int Zdepth = closestElem(nbPick, buffer.get());
float depth = float(Zdepth)/MAX_HW_DEPTH_VALUE;
fMinZ = std::min(depth,fMinZ);
}
}