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/*
* Copyright 2010, Google Inc.
* 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER OR 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.
*/
/**
* A VertexSource is an object that allows binding Streams such that the
* VertexSource updates the Buffers of the Streams that have been bound to it.
* An example of a VertexSource object is a SkinEval
*
* @constructor
* @extends ParamObject
*/
o3d.VertexSource = function() {
o3d.ParamObject.call(this);
};
o3d.inherit('VertexSource', 'ParamObject');
/**
* Bind the source stream to the corresponding stream in this VertexSource.
*
* @param {o3d.VertexSource} source Source to get vertices from.
* @param {o3d.Stream.Semantic} semantic The semantic of the vertices to get.
* @param {number} semantic_index The semantic index of the vertices to get.
* @return {boolean} True if success. False if failure. If the requested
* semantic or semantic index do not exist on the source or this source
* the bind will fail.
*/
o3d.VertexSource.prototype.bindStream = function(
source, semantic, semantic_index) {
if (source) {
var source_param = source.getVertexStreamParam(semantic, semantic_index);
var dest_param = this.getVertexStreamParam(semantic, semantic_index);
if (source_param && dest_param &&
source_param.stream.field.className ==
dest_param.stream.field.className &&
source_param.stream.field.numComponents ==
dest_param.stream.field.numComponents) {
dest_param.bind(source_param);
source.streamWasBound_(this, semantic, semantic_index);
return true;
}
}
return false;
};
/**
* Unbinds the requested stream.
*
* @param {o3d.Stream.Semantic} semantic The semantic of the vertices to unbind.
* @param {number} semantic_index The semantic index of the vertices to unbind.
* @return {boolean} True if unbound. False those vertices do not exist or were
* not bound.
*/
o3d.VertexSource.prototype.unbindStream = function(semantic, semantic_index) {
var dest_param = this.getVertexStreamParam(semantic, semantic_index);
if (dest_param && dest_param.inputConnection != null) {
dest_param.unbindInput();
return true;
}
return false;
};
/**
* Used by bindStream. Each derived class must provide this function.
*
* @param {o3d.Stream.Semantic} semantic The semantic of the vertices to get.
* @param {number} semantic_index The semantic index of the vertices to get.
* @return {ParamVertexBufferStream} Returns the ParamVertexBufferStream that
* manages the given stream as an output param for this VertexSource.
* @protected
*/
o3d.VertexSource.prototype.getVertexStreamParam = function(
semantic, semantic_index) {
o3d.notImplemented();
};
/**
* Used by bindStream. Derived classes may override if needed.
*
* @param {o3d.VertexSource} dest VertexSource that bound to this VertexSource.
* @param {o3d.ParamVertexBufferStream} dest_param Other param which was bound.
* @protected
*/
o3d.VertexSource.prototype.streamWasBound_ = function(
dest, semantic, semantic_index) {
};
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