Splitting of layers for correct intersections

cc/output/static_geometry_binding.cc

Index: cc/output/static_geometry_binding.cc
diff --git a/cc/output/static_geometry_binding.cc b/cc/output/static_geometry_binding.cc
new file mode 100644
index 0000000000000000000000000000000000000000..683db2dd9594988da625c3e63280727db13c9ba8
--- /dev/null
+++ b/cc/output/static_geometry_binding.cc
@@ -0,0 +1,72 @@
+// 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/static_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 {
+
+StaticGeometryBinding::StaticGeometryBinding(gpu::gles2::GLES2Interface* gl,
+                                             const gfx::RectF& quad_vertex_rect)
+    : gl_(gl), quad_vertices_vbo_(0), quad_elements_vbo_(0) {
+  GeometryBindingQuad quads[8];
+  GeometryBindingQuadIndex quad_indices[8];
+
+  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");
+
+  for (size_t i = 0; i < 8; i++) {
+    GeometryBindingVertex v0 = {
+        {quad_vertex_rect.x(), quad_vertex_rect.bottom(), 0.0f},
+        {0.0f, 1.0f},
+        i * 4.0f + 0.0f};
+    GeometryBindingVertex v1 = {
+        {quad_vertex_rect.x(), quad_vertex_rect.y(), 0.0f},
+        {0.0f, 0.0f},
+        i * 4.0f + 1.0f};
+    GeometryBindingVertex v2 = {
+        {quad_vertex_rect.right(), quad_vertex_rect.y(), 0.0f},
+        {1.0f, 0.0f},
+        i * 4.0f + 2.0f};
+    GeometryBindingVertex v3 = {
+        {quad_vertex_rect.right(), quad_vertex_rect.bottom(), 0.0f},
+        {1.0f, 1.0f},
+        i * 4.0f + 3.0f};
+    GeometryBindingQuad x(v0, v1, v2, v3);
+    quads[i] = x;
+    GeometryBindingQuadIndex y(
+        static_cast<uint16>(0 + 4 * i), static_cast<uint16>(1 + 4 * i),
+        static_cast<uint16>(2 + 4 * i), static_cast<uint16>(3 + 4 * i),
+        static_cast<uint16>(0 + 4 * i), static_cast<uint16>(2 + 4 * i));
+    quad_indices[i] = y;
+  }
+
+  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) * 8,
+                           quads, GL_STATIC_DRAW));
+
+  GLC(gl_, gl_->BindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_elements_vbo_));
+  GLC(gl_, gl_->BufferData(GL_ELEMENT_ARRAY_BUFFER,
+                           sizeof(GeometryBindingQuadIndex) * 8, &quad_indices,
+                           GL_STATIC_DRAW));
+}
+
+StaticGeometryBinding::~StaticGeometryBinding() {
+  gl_->DeleteBuffers(1, &quad_vertices_vbo_);
+  gl_->DeleteBuffers(1, &quad_elements_vbo_);
+}
+
+void StaticGeometryBinding::PrepareForDraw() {
+  SetupGLContext(gl_, quad_elements_vbo_, quad_vertices_vbo_);
+}
+
+}  // namespace cc