Programming a Multiplayer FPS in DirectX/Programming a Multiplayer FPS in DirectX (Companion CD).iso/Source/Chapter 9/Engine/SceneObject.cpp

C/C++ Source or Header | 2004-10-01 | 20.2 KB | 579 lines

//-----------------------------------------------------------------------------
// SceneObject.h implementation.
// Refer to the SceneObject.h interface for more details.
//
// Programming a Multiplayer First Person Shooter in DirectX
// Copyright (c) 2004 Vaughan Young
//-----------------------------------------------------------------------------
#include "Engine.h"

//-----------------------------------------------------------------------------
// The scene object class constructor.
//-----------------------------------------------------------------------------
SceneObject::SceneObject( unsigned long type, char *meshName, char *meshPath, bool sharedMesh )
{
    // Set the object's type;
    SetType( type );

    // Zero the scene object's translation and rotation.
    SetTranslation( 0.0f, 0.0f, 0.0f );
    SetRotation( 0.0f, 0.0f, 0.0f );

    // The object is initially at rest.
    SetVelocity( 0.0f, 0.0f, 0.0f );
    SetSpin( 0.0f, 0.0f, 0.0f );

    // The object is initially facing into the positive z-axis.
    m_forward = D3DXVECTOR3( 0.0f, 0.0f, 1.0f );
    m_right = D3DXVECTOR3( 1.0f, 0.0f, 0.0f );

    // Initially the object has no friction.
    m_friction = 0.0f;

    // Clear the collision stamp.
    m_collisionStamp = -1;

    // The object is visible, enabled, solid, and registering collisons by default.
    m_visible = true;
    m_enabled = true;
    m_ghost = false;
    m_ignoreCollisions = false;

    // Initially the object is not touching the ground.
    m_touchingGround = false;

    // Set the object's mesh.
    m_mesh = NULL;
    SetMesh( meshName, meshPath, sharedMesh );
}

//-----------------------------------------------------------------------------
// The scene object class destructor.
//-----------------------------------------------------------------------------
SceneObject::~SceneObject()
{
    // Destroy the object's mesh.
    if( m_sharedMesh == true )
        g_engine->GetMeshManager()->Remove( &m_mesh );
    else
        SAFE_DELETE( m_mesh );
}

//-----------------------------------------------------------------------------
// Updates the object.
//-----------------------------------------------------------------------------
void SceneObject::Update( float elapsed, bool addVelocity )
{
    // Calculate the friction for this update.
    float friction = 1.0f - m_friction * elapsed;

    // Move the object.
    m_velocity *= friction;
    if( addVelocity == true )
    {
        D3DXVECTOR3 velocity = m_velocity * elapsed;
        AddTranslation( velocity.x, velocity.y, velocity.z );
    }

    // Spin the object.
    m_spin *= friction;
    D3DXVECTOR3 spin = m_spin * elapsed;
    AddRotation( spin.x, spin.y, spin.z );

    // Update the object's world matrix.
    D3DXMatrixMultiply( &m_worldMatrix, &m_rotationMatrix, &m_translationMatrix );

    // Create a view matrix for the object.
    D3DXMatrixInverse( &m_viewMatrix, NULL, &m_worldMatrix );

    // Update the object's forward vector.
    m_forward.x = (float)sin( m_rotation.y );
    m_forward.y = (float)-tan( m_rotation.x );
    m_forward.z = (float)cos( m_rotation.y );
    D3DXVec3Normalize( &m_forward, &m_forward );

    // Update the object's right vector.
    m_right.x = (float)cos( m_rotation.y );
    m_right.y = (float)tan( m_rotation.z );
    m_right.z = (float)-sin( m_rotation.y );
    D3DXVec3Normalize( &m_right, &m_right );

    // Update the object's bounding volume using the translation matrix only.
    // This will maintain an axis aligned bounding box around the object in
    // world space rather than the object's local space.
    RepositionBoundingVolume( &m_translationMatrix );
}

//-----------------------------------------------------------------------------
// Renders the object.
//-----------------------------------------------------------------------------
void SceneObject::Render( D3DXMATRIX *world )
{
    // Ignore the object if it has no mesh.
    if( m_mesh == NULL )
        return;

    // Check if the object's world tranformation matrix has been overridden.
    if( world == NULL )
        g_engine->GetDevice()->SetTransform( D3DTS_WORLD, &m_worldMatrix );
    else
        g_engine->GetDevice()->SetTransform( D3DTS_WORLD, world );

    // Render the object's mesh.
    m_mesh->Render();
}

//-----------------------------------------------------------------------------
// Called when something collides with the object.
//-----------------------------------------------------------------------------
void SceneObject::CollisionOccurred( SceneObject *object, unsigned long collisionStamp )
{
    // Set the collision stamp.
    m_collisionStamp = collisionStamp;
}

//-----------------------------------------------------------------------------
// Applies the given force to the object in the forwards/backwards direction.
//-----------------------------------------------------------------------------
void SceneObject::Drive( float force, bool lockYAxis )
{
    D3DXVECTOR3 realForce = m_forward * force;

    m_velocity.x += realForce.x;
    m_velocity.z += realForce.z;

    if( lockYAxis == false )
        m_velocity.y += realForce.y;
}

//-----------------------------------------------------------------------------
// Applies the given force to the object in the right/left direction.
//-----------------------------------------------------------------------------
void SceneObject::Strafe( float force, bool lockYAxis )
{
    D3DXVECTOR3 realForce = m_right * force;

    m_velocity.x += realForce.x;
    m_velocity.z += realForce.z;

    if( lockYAxis == false )
        m_velocity.y += realForce.y;
}

//-----------------------------------------------------------------------------
// Stops the object moving.
//-----------------------------------------------------------------------------
void SceneObject::Stop()
{
    m_velocity = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
    m_spin = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
}

//-----------------------------------------------------------------------------
// Sets the object's translation.
//-----------------------------------------------------------------------------
void SceneObject::SetTranslation( float x, float y, float z )
{
    m_translation.x = x;
    m_translation.y = y;
    m_translation.z = z;

    D3DXMatrixTranslation( &m_translationMatrix, m_translation.x, m_translation.y, m_translation.z );
}

//-----------------------------------------------------------------------------
// Sets the object's translation.
//-----------------------------------------------------------------------------
void SceneObject::SetTranslation( D3DXVECTOR3 translation )
{
    m_translation = translation;

    D3DXMatrixTranslation( &m_translationMatrix, m_translation.x, m_translation.y, m_translation.z );
}

//-----------------------------------------------------------------------------
// Adds the given translation to the object's current translation.
//-----------------------------------------------------------------------------
void SceneObject::AddTranslation( float x, float y, float z )
{
    m_translation.x += x;
    m_translation.y += y;
    m_translation.z += z;

    D3DXMatrixTranslation( &m_translationMatrix, m_translation.x, m_translation.y, m_translation.z );
}

//-----------------------------------------------------------------------------
// Adds the given translation to the object's current translation.
//-----------------------------------------------------------------------------
void SceneObject::AddTranslation( D3DXVECTOR3 translation )
{
    m_translation += translation;

    D3DXMatrixTranslation( &m_translationMatrix, m_translation.x, m_translation.y, m_translation.z );
}

//-----------------------------------------------------------------------------
// Returns the object's translation.
//-----------------------------------------------------------------------------
D3DXVECTOR3 SceneObject::GetTranslation()
{
    return m_translation;
}

//-----------------------------------------------------------------------------
// Sets the object's rotation.
//-----------------------------------------------------------------------------
void SceneObject::SetRotation( float x, float y, float z )
{
    m_rotation.x = x;
    m_rotation.y = y;
    m_rotation.z = z;

    D3DXMATRIX rotationX, rotationY;
    D3DXMatrixRotationX( &rotationX, m_rotation.x );
    D3DXMatrixRotationY( &rotationY, m_rotation.y );
    D3DXMatrixRotationZ( &m_rotationMatrix, m_rotation.z );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationX );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationY );
}

//-----------------------------------------------------------------------------
// Sets the object's rotation.
//-----------------------------------------------------------------------------
void SceneObject::SetRotation( D3DXVECTOR3 rotation )
{
    m_rotation = rotation;

    D3DXMATRIX rotationX, rotationY;
    D3DXMatrixRotationX( &rotationX, m_rotation.x );
    D3DXMatrixRotationY( &rotationY, m_rotation.y );
    D3DXMatrixRotationZ( &m_rotationMatrix, m_rotation.z );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationX );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationY );
}

//-----------------------------------------------------------------------------
// Adds the given rotation to the object's current rotation.
//-----------------------------------------------------------------------------
void SceneObject::AddRotation( float x, float y, float z )
{
    m_rotation.x += x;
    m_rotation.y += y;
    m_rotation.z += z;

    D3DXMATRIX rotationX, rotationY;
    D3DXMatrixRotationX( &rotationX, m_rotation.x );
    D3DXMatrixRotationY( &rotationY, m_rotation.y );
    D3DXMatrixRotationZ( &m_rotationMatrix, m_rotation.z );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationX );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationY );
}

//-----------------------------------------------------------------------------
// Adds the given rotation to the object's current rotation.
//-----------------------------------------------------------------------------
void SceneObject::AddRotation( D3DXVECTOR3 rotation )
{
    m_rotation += rotation;

    D3DXMATRIX rotationX, rotationY;
    D3DXMatrixRotationX( &rotationX, m_rotation.x );
    D3DXMatrixRotationY( &rotationY, m_rotation.y );
    D3DXMatrixRotationZ( &m_rotationMatrix, m_rotation.z );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationX );
    D3DXMatrixMultiply( &m_rotationMatrix, &m_rotationMatrix, &rotationY );
}

//-----------------------------------------------------------------------------
// Returns the object's rotation.
//-----------------------------------------------------------------------------
D3DXVECTOR3 SceneObject::GetRotation()
{
    return m_rotation;
}

//-----------------------------------------------------------------------------
// Sets the object's velocity.
//-----------------------------------------------------------------------------
void SceneObject::SetVelocity( float x, float y, float z )
{
    m_velocity.x = x;
    m_velocity.y = y;
    m_velocity.z = z;
}

//-----------------------------------------------------------------------------
// Sets the object's velocity.
//-----------------------------------------------------------------------------
void SceneObject::SetVelocity( D3DXVECTOR3 velocity )
{
    m_velocity = velocity;
}

//-----------------------------------------------------------------------------
// Adds the given velocity to the object's current velocity.
//-----------------------------------------------------------------------------
void SceneObject::AddVelocity( float x, float y, float z )
{
    m_velocity.x += x;
    m_velocity.y += y;
    m_velocity.z += z;
}

//-----------------------------------------------------------------------------
// Adds the given velocity to the object's current velocity.
//-----------------------------------------------------------------------------
void SceneObject::AddVelocity( D3DXVECTOR3 velocity )
{
    m_velocity += velocity;
}

//-----------------------------------------------------------------------------
// Returns the object's velocity.
//-----------------------------------------------------------------------------
D3DXVECTOR3 SceneObject::GetVelocity()
{
    return m_velocity;
}

//-----------------------------------------------------------------------------
// Sets the object's spin.
//-----------------------------------------------------------------------------
void SceneObject::SetSpin( float x, float y, float z )
{
    m_spin.x = x;
    m_spin.y = y;
    m_spin.z = z;
}

//-----------------------------------------------------------------------------
// Sets the object's spin.
//-----------------------------------------------------------------------------
void SceneObject::SetSpin( D3DXVECTOR3 spin )
{
    m_spin = spin;
}

//-----------------------------------------------------------------------------
// Adds the given spin to the object's current spin.
//-----------------------------------------------------------------------------
void SceneObject::AddSpin( float x, float y, float z )
{
    m_spin.x += x;
    m_spin.y += y;
    m_spin.z += z;
}

//-----------------------------------------------------------------------------
// Adds the given spin to the object's current spin.
//-----------------------------------------------------------------------------
void SceneObject::AddSpin( D3DXVECTOR3 spin )
{
    m_spin = spin;
}

//-----------------------------------------------------------------------------
// Returns the object's spin.
//-----------------------------------------------------------------------------
D3DXVECTOR3 SceneObject::GetSpin()
{
    return m_spin;
}

//-----------------------------------------------------------------------------
// Returns the object's forward vector.
//-----------------------------------------------------------------------------
D3DXVECTOR3 SceneObject::GetForwardVector()
{
    return m_forward;
}

//-----------------------------------------------------------------------------
// Returns the object's right vector.
//-----------------------------------------------------------------------------
D3DXVECTOR3 SceneObject::GetRightVector()
{
    return m_right;
}

//-----------------------------------------------------------------------------
// Returns a pointer to the object's current translation matrix.
//-----------------------------------------------------------------------------
D3DXMATRIX *SceneObject::GetTranslationMatrix()
{
    return &m_translationMatrix;
}

//-----------------------------------------------------------------------------
// Returns a pointer to the object's current rotation matrix.
//-----------------------------------------------------------------------------
D3DXMATRIX *SceneObject::GetRotationMatrix()
{
    return &m_rotationMatrix;
}

//-----------------------------------------------------------------------------
// Returns a pointer to the object's current world matrix.
//-----------------------------------------------------------------------------
D3DXMATRIX *SceneObject::GetWorldMatrix()
{
    return &m_worldMatrix;
}

//-----------------------------------------------------------------------------
// Returns a pointer to the object's current view matrix.
//-----------------------------------------------------------------------------
D3DXMATRIX *SceneObject::GetViewMatrix()
{
    return &m_viewMatrix;
}

//-----------------------------------------------------------------------------
// Sets the object's type.
//-----------------------------------------------------------------------------
void SceneObject::SetType( unsigned long type )
{
    m_type = type;
}

//-----------------------------------------------------------------------------
// Returns the object's type.
//-----------------------------------------------------------------------------
unsigned long SceneObject::GetType()
{
    return m_type;
}

//-----------------------------------------------------------------------------
// Sets the object's friction.
//-----------------------------------------------------------------------------
void SceneObject::SetFriction( float friction )
{
    m_friction = friction;
}

//-----------------------------------------------------------------------------
// Returns the collision stamp.
//-----------------------------------------------------------------------------
unsigned long SceneObject::GetCollisionStamp()
{
    return m_collisionStamp;
}

//-----------------------------------------------------------------------------
// Sets the object's visible flag.
//-----------------------------------------------------------------------------
void SceneObject::SetVisible( bool visible )
{
    m_visible = visible;
}

//-----------------------------------------------------------------------------
// Returns the object's visible flag.
//-----------------------------------------------------------------------------
bool SceneObject::GetVisible()
{
    return m_visible;
}

//-----------------------------------------------------------------------------
// Sets the object's enabled flag.
//-----------------------------------------------------------------------------
void SceneObject::SetEnabled( bool enabled )
{
    m_enabled = enabled;
}

//-----------------------------------------------------------------------------
// Returns the object's enabled flag.
//-----------------------------------------------------------------------------
bool SceneObject::GetEnabled()
{
    return m_enabled;
}

//-----------------------------------------------------------------------------
// Sets the object's ghost flag.
//-----------------------------------------------------------------------------
void SceneObject::SetGhost( bool ghost )
{
    m_ghost = ghost;
}

//-----------------------------------------------------------------------------
// Returns the object's ghost flag.
//-----------------------------------------------------------------------------
bool SceneObject::GetGhost()
{
    return m_ghost;
}

//-----------------------------------------------------------------------------
// Sets the object's ignore collisions flag.
//-----------------------------------------------------------------------------
void SceneObject::SetIgnoreCollisions( bool ignoreCollisions )
{
    m_ignoreCollisions = ignoreCollisions;
}

//-----------------------------------------------------------------------------
// Returns the object's ignore collisions flag.
//-----------------------------------------------------------------------------
bool SceneObject::GetIgnoreCollisions()
{
    return m_ignoreCollisions;
}

//-----------------------------------------------------------------------------
// Set's the the flag for touching the ground.
//-----------------------------------------------------------------------------
void SceneObject::SetTouchingGroundFlag( bool touchingGround )
{
    m_touchingGround = touchingGround;
}

//-----------------------------------------------------------------------------
// Returns true if the object is touching the ground.
//-----------------------------------------------------------------------------
bool SceneObject::IsTouchingGround()
{
    return m_touchingGround;
}

//-----------------------------------------------------------------------------
// Sets the mesh for this scene object.
//-----------------------------------------------------------------------------
void SceneObject::SetMesh( char *meshName, char *meshPath, bool sharedMesh )
{
    // Destroy the object's exisiting mesh.
    if( m_sharedMesh == true )
        g_engine->GetMeshManager()->Remove( &m_mesh );
    else
        SAFE_DELETE( m_mesh );

    // Indicate if the object is sharing this mesh.
    m_sharedMesh = sharedMesh;

    // Ensure a mesh was specified.
    if( meshName != NULL && meshPath != NULL )
    {
        // Load the object's mesh.
        if( m_sharedMesh == true )
            m_mesh = g_engine->GetMeshManager()->Add( meshName, meshPath );
        else
            m_mesh = new Mesh( meshName, meshPath );

        // Clone the mesh's bounding volume. The bounding volume will be used
        // to maintain an axis aligned bounding volume in world space.
        CloneBoundingVolume( m_mesh->GetBoundingBox(), m_mesh->GetBoundingSphere() );
    }
}

//-----------------------------------------------------------------------------
// Returns a pointer to the object's mesh.
//-----------------------------------------------------------------------------
Mesh *SceneObject::GetMesh()
{
    return m_mesh;
}