Multiple Viewports

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Hi folks,

Dunno if anyone is interested but here is a copy of my guiViewport which is fairly basic at the moment. It allows you to render (after a selected rotation around the player camera) a view.

If you know of a better way of doing this then I would appreciate any advice you could give.

I've only done a single rotation around the 'Up' vector but it's simple to mod it. You could even setup a GOD view using it with minor changes. Watch out when adding multiple views as they can get VERY costly!!

Enjoy.

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#include "sceneGraph/sceneGraph.h"
#include "game/gameConnection.h"
#include "console/consoleTypes.h"
#include "gui/guiTSControl.h"


class GuiViewport : public GuiTSCtrl
{
private:
typedef GuiTSCtrl Parent;

// View Rotation.
F32 mRotateView;

virtual void renderScene(const RectI &){};
void renderWorld(const RectI & updateRect);

public:
GuiViewport() : mRotateView(180.0f) {};

static void initPersistFields();
bool processCameraQuery(CameraQuery * query);
void setViewRotation(F32 Rotation);

DECLARE_CONOBJECT(GuiViewport);
};

//------------------------------------------------------------------------------

IMPLEMENT_CONOBJECT(GuiViewport);

//------------------------------------------------------------------------------

void GuiViewport::initPersistFields()
{
// Initialise parents' persistent fields.
Parent::initPersistFields();

// Add out own persistent fields.
addField( "ViewRotation", TypeF32, Offset( mRotateView, GuiViewport ) );
}

//------------------------------------------------------------------------------

void GuiViewport::setViewRotation(F32 Rotation)
{
// Set the Rotation internally.
mRotateView = Rotation;
}

//------------------------------------------------------------------------------

ConsoleMethod(GuiViewport,setViewRotation,void,3,3,"Sets View Rotation.")
{
F32 Rotation;

// Fetch the GuiViewport object.
GuiViewport *Viewport = static_cast(object);

// Convert RGB Ascii parms to float.
Rotation = dAtof(argv[2]);

// Set View Rotation.
Viewport->setViewRotation(Rotation);
}

//------------------------------------------------------------------------------

void GuiViewport::renderWorld(const RectI & updateRect)
{
// Set-up OpenGL for a scene render.
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glClear(GL_DEPTH_BUFFER_BIT);
glDisable(GL_CULL_FACE);
glMatrixMode(GL_MODELVIEW);
dglSetCanonicalState();

// Render Client Scene Graph.
gClientSceneGraph->renderScene();

// Disable Depth Test.
glDisable(GL_DEPTH_TEST);
}

//------------------------------------------------------------------------------

bool GuiViewport::processCameraQuery(CameraQuery * query)
{
Point3F CameraRotation(0, 0, mDegToRad(mRotateView)); // Rotated View.
float VisibleDistance = 1100.0f; // Visible Distance.


// Get Game Connection.
GameConnection* pConnection = dynamic_cast(NetConnection::getServerConnection());

// Did we get the connection?
if (pConnection)
{
// Yes, so get control camera transform.
if (pConnection->getControlCameraTransform(0.032, &query->cameraMatrix))
{
// Set Near/Far Planes.
query->nearPlane = 0.1;
query->farPlane = getMax(VisibleDistance, 50.f);

// Get existing Camera FOV.
pConnection->getControlCameraFov(&query->fov);

// Rotate Camera.
query->cameraMatrix.mul(MatrixF(CameraRotation));

// Return OK.
return(true);
}
}

// Return Error.
return(false);
}