Splitting of layers for correct intersections

Sorting 3d-sorted layers and rendering them in that order causes issues
when layers intersect. Instead place 3d-sorted layers in a bsp tree and
fragment any intersecting layers into non-rectangular quads. We can then
render the fragments in the correct sorted order regardless of
intersections.

BUG=455918,159225,132122,230833

Review URL: https://codereview.chromium.org/595593002

Cr-Commit-Position: refs/heads/master@{#320096}

1 files changed, 30 insertions, 0 deletions

diff --git a/cc/output/dynamic_geometry_binding.h b/cc/output/dynamic_geometry_binding.h
new file mode 100644
index 0000000..4e4ea3d
--- /dev/null
+++ b/cc/output/dynamic_geometry_binding.h
@@ -0,0 +1,30 @@
+// Copyright 2015 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.
+
+#ifndef CC_OUTPUT_DYNAMIC_GEOMETRY_BINDING_H_
+#define CC_OUTPUT_DYNAMIC_GEOMETRY_BINDING_H_
+
+#include "cc/output/geometry_binding.h"
+
+namespace cc {
+
+class DynamicGeometryBinding {
+ public:
+  explicit DynamicGeometryBinding(gpu::gles2::GLES2Interface* gl);
+  void PrepareForDraw();
+  void InitializeCustomQuad(const gfx::QuadF& quad);
+  void InitializeCustomQuadWithUVs(const gfx::QuadF& quad, const float uv[8]);
+
+ private:
+  gpu::gles2::GLES2Interface* gl_;
+
+  GLuint quad_vertices_vbo_;
+  GLuint quad_elements_vbo_;
+
+  DISALLOW_COPY_AND_ASSIGN(DynamicGeometryBinding);
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_DYNAMIC_GEOMETRY_BINDING_H_