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ACamera.cpp

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/*
CS Senior Project 2003
Team : Leftfield
Project : ModernWarfare
Members :
- Russ Christensen              <rchriste@cs.utah.edu>
- Todd Smith                    <tcsmith@cs.utah.edu>
- Usit Duongsaa                 <duongsaa@cs.utah.edu>
Copyright 2003 Russ Christensen, Usit Duongsaa, and Todd Smith. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
THIS SOFTWARE IS PROVIDED BY RUSS CHRISTENSEN, USIT DUONGSAA, AND TODD SMITH ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RUSS, USIT, TODD OR OTHER CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "AEngine.h"
#include "AUtil.h"

void camera_set( const Vec3D pos,  const Vec3D target, const FLOAT smoothness )
{
        assert( 0<=smoothness && smoothness<=1 && "camera smoothness must be between 0,1");     
        AS.camera_pos    = smoothness*AS.camera_pos    + (1.0f-smoothness)*pos;
        AS.camera_target = smoothness*AS.camera_target + (1.0f-smoothness)*target;

        // apply vibration
        FLOAT accel = - AS.camera_vibratePos * 5.7f;
        AS.camera_vibrateSpeed  += accel;
        AS.camera_vibrateSpeed  *= 0.96f;
        AS.camera_vibratePos    += AS.camera_vibrateSpeed * 0.4f;       
        AS.camera_pos.z += AS.camera_vibratePos * 0.05f;
        AS.camera_target.z += AS.camera_vibratePos * 0.05f;

        // prevents looking straight down
        if( AS.camera_pos[0]==AS.camera_target[0] && AS.camera_pos[1]==AS.camera_target[1] )
                AS.camera_pos[1] += 0.00001f;
        
        const Vec3D upAxis( 0.0f, 0.0f, 1.0f );
        D3DXMatrixLookAtLH(&AS.camera_viewMatrix, &AS.camera_pos, &AS.camera_target, &upAxis );
        D3DXMatrixPerspectiveFovLH( &AS.camera_projMatrix, D3DXToRadian(60), 1.33333f, 0.1f, 1000.0f );

        AS.camera_world2projMatrix = AS.camera_viewMatrix * AS.camera_projMatrix;       
}
Vec3D camera_getPos()
{
        return AS.camera_pos;
}
Vec3D camera_getVec()
{
        Vec3D dir = AS.camera_target - AS.camera_pos;
        FLOAT len = D3DXVec3Length(&dir);
        return dir * 1.0f/len;
}
void camera_setScreenSize( FLOAT size )
{
        assert( size>0.0f && size<=1.0f );
        AS.camera_screenSize = size;
}
//------------------------------------------------------------------------------------
void camera_addVibration(float amount)
{
        amount = absf(amount);
        if( AS.camera_vibrateSpeed > 0 )
                AS.camera_vibrateSpeed += amount;
        else
                AS.camera_vibrateSpeed -= amount;
}
//------------------------------------------------------------------------------------

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