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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);
/**
* The stream bank this primitive uses for vertices.
* @type {o3d.StreamBank}
*/
this.streamBank = opt_streamBank || null;
/**
* The type of primitive the primitive is (i.e., POINTLIST, LINELIST,
* TRIANGLELIST, etc.)
*
* @type {o3d.Primitive.Type}
*/
this.primitiveType = o3d.Primitive.TRIANGLELIST;
/**
* The number of vertices the primitive has.
*
* @type {number}
*/
this.numberVertices = 0;
/**
* The number of rendering primitives (i.e., triangles, points, lines) the
* primitive has.
*
* @type {number}
*/
this.numberPrimitives = 0;
/**
* The index of the first vertex to render.
* Default = 0.
*
* @type {number}
*/
this.startIndex = 0;
/**
* The index buffer for the primitive. If null the primitive is non-indexed.
* @type {o3d.IndexBuffer}
*/
this.indexBuffer = null;
};
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;
o3d.ParamObject.setUpO3DParam_(o3d.Primitive, 'streamBank', 'ParamStreamBank');
/**
* Binds the vertex and index streams required to draw the shape.
*/
o3d.Primitive.prototype.render = function() {
var streamBank = this.streamBank;
var indexBuffer = this.indexBuffer;
var enabled_attribs = [];
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);
enabled_attribs.push(gl_index);
// TODO(petersont): When the constant WebGLFloatArray.BYTES_PER_ELEMENT
// becomes available in implementations, use that here instead of this
// hard-coded 4.
var kFloatSize = 4;
this.gl.vertexAttribPointer(
gl_index, field.numComponents, this.gl.FLOAT, false,
buffer.totalComponents * kFloatSize, field.offset_ * kFloatSize);
}
}
}
this.gl.client.render_stats_['primitivesRendered'] += this.numberPrimitives;
var glMode;
var glNumElements;
switch (this.primitiveType) {
case o3d.Primitive.POINTLIST:
glMode = this.gl.POINTS;
glNumElements = this.numberPrimitives;
break;
case o3d.Primitive.LINELIST:
glMode = this.gl.LINES;
glNumElements = this.numberPrimitives * 2;
break;
case o3d.Primitive.LINESTRIP:
glMode = this.gl.LINE_STRIP;
glNumElements = this.numberPrimitives + 1;
break;
case o3d.Primitive.TRIANGLELIST:
glMode = this.gl.TRIANGLES;
glNumElements = this.numberPrimitives * 3;
break;
case o3d.Primitive.TRIANGLESTRIP:
glMode = this.gl.TRIANGLE_STRIP;
glNumElements = this.numberPrimitives + 2;
break;
case o3d.Primitive.TRIANGLEFAN:
glMode = this.gl.TRIANGLE_FAN;
glNumElements = this.numberPrimitives + 2;
break;
case o3d.Primitive.TRIANGLELIST:
default:
glMode = this.gl.TRIANGLES;
glNumElements = this.numberPrimitives * 3;
break;
}
if (!indexBuffer) {
this.gl.drawArrays(glMode,
0,
glNumElements);
} else {
this.gl.bindBuffer(this.gl.ELEMENT_ARRAY_BUFFER, indexBuffer.gl_buffer_);
this.gl.drawElements(glMode,
glNumElements,
this.gl.UNSIGNED_SHORT,
0);
}
for (var i = 0; i < enabled_attribs.length; ++i) {
this.gl.disableVertexAttribArray(enabled_attribs[i]);
}
};
/**
* Computes the bounding box in same coordinate system as the specified
* POSITION stream.
* @param {number} position_stream_index Index of POSITION stream.
* @return {!o3d.BoundingBox} The boundingbox for this element in local space.
*/
o3d.Primitive.prototype.getBoundingBox =
function(position_stream_index) {
var streamBank = this.streamBank;
var indexBuffer = this.indexBuffer;
var stream =
this.streamBank.vertexStreams[o3d.Stream.POSITION][position_stream_index];
var points = [];
var field = stream.field;
var buffer = field.buffer;
var numPoints = buffer.array_.length / buffer.totalComponents;
var elements = field.getAt(0, numPoints);
for (var index = 0; index < numPoints; ++index) {
var p = [0, 0, 0];
for (var i = 0; i < field.numComponents; ++i) {
p[i] = elements[field.numComponents * index + i];
}
points.push(p);
}
o3d.BoundingBox.fitBoxToPoints_(points, this.boundingBox);
return this.boundingBox;
};
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