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Issue 384083002: WIP BSP Tree for 3D Layer Sorting (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 5 months ago
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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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