Splitting of layers for correct intersections

cc/output/dynamic_geometry_binding.cc

Index: cc/output/dynamic_geometry_binding.cc
diff --git a/cc/output/dynamic_geometry_binding.cc b/cc/output/dynamic_geometry_binding.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9e25892c15acebfcbeaa75ccdf3d510f61841aa4
--- /dev/null
+++ b/cc/output/dynamic_geometry_binding.cc
@@ -0,0 +1,67 @@
+// 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.
+
+#include "cc/output/dynamic_geometry_binding.h"
+
+#include "cc/output/gl_renderer.h"  // For the GLC() macro.
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "ui/gfx/geometry/rect_f.h"
+
+namespace cc {
+
+DynamicGeometryBinding::DynamicGeometryBinding(gpu::gles2::GLES2Interface* gl)
+    : gl_(gl), quad_vertices_vbo_(0), quad_elements_vbo_(0) {
+  GeometryBindingQuad quads[1];
+  GeometryBindingQuadIndex quad_indices[1];
+
+  static_assert(sizeof(GeometryBindingQuad) == 24 * sizeof(float),
+                "struct Quad should be densely packed");
+  static_assert(sizeof(GeometryBindingQuadIndex) == 6 * sizeof(uint16_t),
+                "struct QuadIndex should be densely packed");
+
+  GLC(gl_, gl_->GenBuffers(1, &quad_vertices_vbo_));
+  GLC(gl_, gl_->GenBuffers(1, &quad_elements_vbo_));
+
+  GLC(gl_, gl_->BindBuffer(GL_ARRAY_BUFFER, quad_vertices_vbo_));
+  GLC(gl_, gl_->BufferData(GL_ARRAY_BUFFER, sizeof(GeometryBindingQuad) * 1,
+                           quads, GL_DYNAMIC_DRAW));
+
+  GLC(gl_, gl_->BindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_elements_vbo_));
+  GLC(gl_, gl_->BufferData(GL_ELEMENT_ARRAY_BUFFER,
+                           sizeof(GeometryBindingQuadIndex) * 1, &quad_indices,
+                           GL_DYNAMIC_DRAW));
+}
+
+void DynamicGeometryBinding::InitializeCustomQuad(const gfx::QuadF& quad) {
+  float uv[] = {0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f};
+  InitializeCustomQuadWithUVs(quad, uv);
+}
+
+void DynamicGeometryBinding::InitializeCustomQuadWithUVs(const gfx::QuadF& quad,
+                                                         const float uv[8]) {
+  GeometryBindingVertex v0 = {
+      {quad.p1().x(), quad.p1().y(), 0.0f}, {uv[0], uv[1]}, 0.0f};
+  GeometryBindingVertex v1 = {
+      {quad.p2().x(), quad.p2().y(), 0.0f}, {uv[2], uv[3]}, 1.0f};
+  GeometryBindingVertex v2 = {
+      {quad.p3().x(), quad.p3().y(), 0.0f}, {uv[4], uv[5]}, 2.0f};
+  GeometryBindingVertex v3 = {
+      {quad.p4().x(), quad.p4().y(), 0.0f}, {uv[6], uv[7]}, 3.0f};
+
+  GeometryBindingQuad local_quad = {v0, v1, v2, v3};
+  GeometryBindingQuadIndex quad_index(
+      static_cast<uint16>(0), static_cast<uint16>(1), static_cast<uint16>(2),
+      static_cast<uint16>(3), static_cast<uint16>(0), static_cast<uint16>(2));
+
+  GLC(gl_, gl_->BufferSubData(GL_ARRAY_BUFFER, 0, sizeof(GeometryBindingQuad),
+                              &local_quad));
+  GLC(gl_, gl_->BufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0,
+                              sizeof(GeometryBindingQuadIndex), &quad_index));
+}
+
+void DynamicGeometryBinding::PrepareForDraw() {
+  SetupGLContext(gl_, quad_elements_vbo_, quad_vertices_vbo_);
+}
+
+}  // namespace cc