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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 Primitive is a type of Element that is made from a list of points,
* lines or triangles that use a single material.
*
* @param opt_streamBank o3d.StreamBank The StreamBank used by this
* Primitive.
* @constructor
*/
o3d.Primitive = function(opt_streamBank) {
o3d.Element.call(this);
this.streamBank = opt_streamBank;
};
o3d.inherit('Primitive', 'Element');
/**
* @type {number}
*/
o3d.Primitive.Type = goog.typedef;
/**
* Type of geometric primitives used by the Primitive.
*/
o3d.Primitive.POINTLIST = 1;
o3d.Primitive.LINELIST = 2;
o3d.Primitive.LINESTRIP = 3;
o3d.Primitive.TRIANGLELIST = 4;
o3d.Primitive.TRIANGLESTRIP = 5;
o3d.Primitive.TRIANGLEFAN = 6;
/**
* The type of primitive the primitive is (i.e., POINTLIST, LINELIST,
* TRIANGLELIST, etc.)
*
* @type {o3d.Primitive.Type}
*/
o3d.Primitive.prototype.primitiveType = o3d.Primitive.TRIANGLELIST;
/**
* The number of vertices the primitive has.
*
* @type {number}
*/
o3d.Primitive.prototype.numberVertices = 0;
/**
* The number of rendering primitives (i.e., triangles, points, lines) the
* primitive has.
*
* @type {number}
*/
o3d.Primitive.prototype.numberPrimitives = 0;
/**
* The index of the first vertex to render.
* Default = 0.
*
* @type {number}
*/
o3d.Primitive.prototype.startIndex = 0;
/**
* The stream bank this primitive uses for vertices.
* @type {o3d.StreamBank}
*/
o3d.Primitive.prototype.streamBank = null;
/**
* The index buffer for the primitive. If null the primitive is non-indexed.
* @type {number}
*/
o3d.Primitive.prototype.indexBuffer = null;
/**
* Binds the vertex and index streams required to draw the shape.
*/
o3d.Primitive.prototype.render = function() {
var streamBank = this.streamBank;
var indexBuffer = this.indexBuffer;
for (var semantic = 0;
semantic < streamBank.vertexStreams.length;
++semantic) {
var streams = streamBank.vertexStreams[semantic];
if (streams && streams.length) {
for (var semantic_index = 0;
semantic_index < streams.length;
++semantic_index) {
var gl_index = semantic + semantic_index - 1;
var stream = streams[semantic_index];
var field = stream.field;
var buffer = field.buffer;
this.gl.bindBuffer(this.gl.ARRAY_BUFFER, buffer.gl_buffer_);
this.gl.enableVertexAttribArray(gl_index);
// TODO(petersont): Change that hard-coded 4 down there.
this.gl.vertexAttribPointer(
gl_index, field.numComponents, this.gl.FLOAT, false,
buffer.totalComponents * 4, field.offset_ * 4);
}
}
}
// TODO(petersont): Change the hard-coded 3 and triangles too.
this.gl.bindBuffer(this.gl.ELEMENT_ARRAY_BUFFER, indexBuffer.gl_buffer_);
this.gl.drawElements(this.gl.TRIANGLES,
this.numberPrimitives * 3,
this.gl.UNSIGNED_SHORT,
0);
};
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