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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
/*
* camera class
*/
camera = function() {
this.proj = mat4.identity();
this.view = mat4.identity();
this.world = mat4.identity();
this.viewProj = mat4.identity();
this.invViewProj = mat4.identity();
this.frustum = [];
this.frustumPts = [];
this.controller = null;
this.setPerspective = function(fov, aratio, near, far)
{
this.ortho = null;
this.persp = {};
this.persp.fov = fov;
this.persp.aratio = aratio;
this.persp.near = near;
this.persp.far = far;
this.proj = mat4.perspective(fov, aratio, near, far);
this.recalc();
}
this.reset = function() {
this.world = mat4.identity();
this.recalc();
}
this.copy = function(cam) {
mat4.inplace_copy(this.view, cam.view);
mat4.inplace_copy(this.world, cam.world);
mat4.inplace_copy(this.proj, cam.proj);
mat4.inplace_copy(this.viewProj, cam.viewProj);
mat4.inplace_copy(this.invViewProj, cam.invViewProj);
this.frustum = cam.frustum.slice();
this.frustumPts = cam.frustumPts.slice();
}
this.recalc = function() {
// update frustum planes
this.frustum = [];
var vp = this.viewProj;
normalizePlane = function( p ) {
var len = vec3.length( p );
if( Math.abs( 1.0 - len ) > 0.001 ) {
p[0] /= len;
p[1] /= len;
p[2] /= len;
p[3] /= len;
}
return p;
}
/* This is the old way
var t = this.persp.near * Math.tan(0.017453292519943295769236 * this.persp.fov * 0.5);
var r = t * this.persp.aratio;
var u = t;
var l = -r;
var b = -u;
tview = mat4.transpose(this.view);
this.frustum.push( normalizePlane( mat4.transformPoint(tview, [this.persp.near, 0.0, l, 0.0] ) ) ); // left
this.frustum.push( normalizePlane( mat4.transformPoint(tview, [-this.persp.near, 0.0, -r, 0.0] ) ) ); // right
this.frustum.push( normalizePlane( mat4.transformPoint(tview, [0.0, this.persp.near, b, 0.0] ) ) ); // bottom
this.frustum.push( normalizePlane( mat4.transformPoint(tview, [0.0, -this.persp.near, -u, 0.0] ) ) ); // top
this.frustum.push( normalizePlane( mat4.transformPoint(tview, [0.0, 0.0, -1.0, -this.persp.near] ) ) ); // near
this.frustum.push( normalizePlane( mat4.transformPoint(tview, [0.0, 0.0, 1.0, this.persp.far] ) ) ); // far
*/
var l = normalizePlane( [vp[3] + vp[0], vp[7] + vp[4], vp[11] + vp[8], vp[15]+vp[12]] );
var r = normalizePlane( [vp[3] - vp[0], vp[7] - vp[4], vp[11] - vp[8], vp[15]-vp[12]] );
var t = normalizePlane( [vp[3] - vp[1], vp[7] - vp[5], vp[11] - vp[9], vp[15]-vp[13]] );
var b = normalizePlane( [vp[3] + vp[1], vp[7] + vp[5], vp[11] + vp[9], vp[15]+vp[13]] );
var n = normalizePlane( [vp[3] + vp[2], vp[7] + vp[6], vp[11] + vp[10], vp[15]+vp[14]] );
var f = normalizePlane( [vp[3] - vp[2], vp[7] - vp[6], vp[11] - vp[10], vp[15]-vp[14]] );
this.frustum.push(l);
this.frustum.push(r);
this.frustum.push(t);
this.frustum.push(b);
this.frustum.push(n);
this.frustum.push(f);
// update frustum points
this.frustumPts = [];
var invvp = this.viewProj;
this.frustumPts.push( mat4.transformPoint( invvp, [-1,-1,-1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [-1,1,-1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [1,1,-1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [1,-1,-1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [-1,-1,1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [-1,1,1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [1,1,1] ) );
this.frustumPts.push( mat4.transformPoint( invvp, [1,-1,1] ) );
};
this.setWorld = function(m) {
this.world = m;
this.view = mat4.inverse(m);
this.viewProj = mat4.mul( this.view, this.proj );
this.invViewProj = mat4.inverse(this.viewProj);
this.recalc();
}
this.setView = function(m) {
this.view = m;
this.world = mat4.inverse(m);
this.viewProj = mat4.mul( this.view, this.proj );
this.invViewProj = mat4.inverse(this.viewProj);
this.recalc();
}
this.setLookAt = function(eyePos, targetPos, upVec) {
this.setWorld( mat4.lookAt(eyePos, targetPos, upVec) );
//this.recalc();
};
this.setPerspective = function(fov, aratio, near, far) {
this.ortho = null;
this.persp = {};
this.persp.fov = fov;
this.persp.aratio = aratio;
this.persp.near = near;
this.persp.far = far;
this.proj = mat4.perspective(fov, aratio, near, far);
this.recalc();
}
this.setOrthographic = function( l, r, t, b, n, f ) {
this.persp = null;
this.ortho = {};
this.ortho.left = l;
this.ortho.right = r;
this.ortho.top = t;
this.ortho.bottom = b;
this.ortho.near = n;
this.ortho.far = f;
this.proj = mat4.orthographic(l, r, t, b, n, f);
this.recalc();
}
this.onResize = function(x, y, width, height) {
if( this.persp ) {
this.setPerspective(this.persp.fov, width / height, this.persp.near, this.persp.far);
}
if( this.ortho ) {
this.setOrthographic(x, x + width, y, y + height, this.ortho.near, this.ortho.far);
}
}
this.zNear = function() {
if( this.persp ) {
return this.persp.near;
}
if( this.ortho ) {
return this.ortho.near;
}
return 0.0;
}
this.zFar = function() {
if( this.persp ) {
return this.persp.far;
}
if( this.ortho ) {
return this.ortho.far;
}
return 0.0;
}
// this is used by ambient occlusion...
this.getFTR = function() {
var fovyRad = (this.persp.fov * 0.5) * Math.PI / 180.0;
return [
Math.tan(fovyRad) * this.persp.far,
Math.tan(fovyRad / this.persp.aratio) * this.persp.far,
this.persp.far ];
}
this.attachCameraToNode = function( node )
{
this.controller = node;
}
}
/** Camera Manager
* This class is used to manage the active camera. It provides functionality
* for getting and setting the active camera, as well as providing stack operations
* to switch to and from multiple cameras.
*/
cameraManager = function() {
this.stack = [];
/* Set the active camera.
* This function sets the active camera to the given camera.
*/
this.setActiveCamera = function(c) {
// pop the active camera off the stack.
if( this.stack.length > 0 ) {
this.stack.pop();
}
// push the given camera onto the stack.
this.stack.push(c);
}
/* Get the active camera.
* The active camera always resides at the top of the stack.
*/
this.getActiveCamera = function() {
if( this.stack.length > 0 ) {
return this.stack[this.stack.length - 1];
} else {
return null;
}
}
/* Push a camera onto the stack.
* The given camera becomes the active camera.
*/
this.pushCamera = function(c) {
this.stack.push(c);
}
/* Pop a camera off the stack.
* Returns the camera that was popped.
* The next camera on the stack becomes active.
*/
this.popCamera = function() {
return this.stack.pop();
}
this.onResize = function(x, y, w, h) {
var i = this.stack.length - 1;
while( i >= 0 ) {
this.stack[i].onResize( x, y, w, h );
i--;
}
}
}
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