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Unified Diff: cc/output/bsp_controller.cc

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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Index: cc/output/bsp_controller.cc
diff --git a/cc/output/bsp_controller.cc b/cc/output/bsp_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a5b6bb283c5fd379e675138bf6bf59615865b3ff
--- /dev/null
+++ b/cc/output/bsp_controller.cc
@@ -0,0 +1,47 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#include "cc/output/bsp_compare_result.h"
+#include "cc/output/bsp_controller.h"
+#include "cc/quads/draw_polygon.h"
+#include "ui/gfx/vector3d_f.h"
+
+namespace cc {
+
+BspController::BspController() {
+}
+
+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.
+float BspController::compare_threshold = 1.0f;
+float BspController::split_threshold = 0.5f;
+
+BspCompareResult BspController::GetNodePositionRelative(
+ const DrawPolygon& node_a,
+ const DrawPolygon& node_b) {
+ return DrawPolygon::SideCompare(node_a, node_b, compare_threshold);
+}
+
+// The base comparer with 0,0,0 as camera position facing forward
+BspCompareResult BspController::GetCameraPositionRelative(
+ const DrawPolygon& node) {
+ // The dot product figures out if we're behind or in front of the
+ // current DrawPolygon based on its normal and a point from it.
+ gfx::Vector3dF camera_minus_point_on_plane = camera_point - node.points[0];
+ if (gfx::DotProduct(camera_minus_point_on_plane, node.normal) > 0.0f) {
+ return BSP_FRONT;
+ }
+ return BSP_BACK;
+}
+
+bool BspController::SplitPolygon(scoped_ptr<DrawPolygon> polygon,
+ const DrawPolygon& splitter,
+ scoped_ptr<DrawPolygon>* front,
+ scoped_ptr<DrawPolygon>* back) {
+ return polygon->Split(splitter, split_threshold, front, back);
+}
+
+float BspController::SplitWeight(const DrawPolygon& polygon) {
+ return polygon.area;
+}
+
+} // namespace cc
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