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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 #include "cc/output/bsp_compare_result.h" | |
5 #include "cc/output/bsp_controller.h" | |
6 #include "cc/quads/draw_polygon.h" | |
7 #include "ui/gfx/vector3d_f.h" | |
8 | |
9 namespace cc { | |
10 | |
11 BspController::BspController() { | |
12 } | |
13 | |
14 static gfx::Point3F camera_point(0.0f, 0.0f, 0.0f); | |
Ian Vollick
2014/07/19 00:45:01
I think that this counts as a static initializer,
troyhildebrandt
2014/07/21 19:16:50
Done.
| |
15 float BspController::compare_threshold = 1.0f; | |
16 float BspController::split_threshold = 0.5f; | |
17 | |
18 BspCompareResult BspController::GetNodePositionRelative( | |
19 const DrawPolygon& node_a, | |
20 const DrawPolygon& node_b) { | |
21 return DrawPolygon::SideCompare(node_a, node_b, compare_threshold); | |
22 } | |
23 | |
24 // The base comparer with 0,0,0 as camera position facing forward | |
25 BspCompareResult BspController::GetCameraPositionRelative( | |
26 const DrawPolygon& node) { | |
27 // The dot product figures out if we're behind or in front of the | |
28 // current DrawPolygon based on its normal and a point from it. | |
29 gfx::Vector3dF camera_minus_point_on_plane = camera_point - node.points[0]; | |
30 if (gfx::DotProduct(camera_minus_point_on_plane, node.normal) > 0.0f) { | |
31 return BSP_FRONT; | |
32 } | |
33 return BSP_BACK; | |
34 } | |
35 | |
36 bool BspController::SplitPolygon(scoped_ptr<DrawPolygon> polygon, | |
37 const DrawPolygon& splitter, | |
38 scoped_ptr<DrawPolygon>* front, | |
39 scoped_ptr<DrawPolygon>* back) { | |
40 return polygon->Split(splitter, split_threshold, front, back); | |
41 } | |
42 | |
43 float BspController::SplitWeight(const DrawPolygon& polygon) { | |
44 return polygon.area; | |
45 } | |
46 | |
47 } // namespace cc | |
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