chrome/browser/vr/elements/controller.h

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_VR_ELEMENTS_CONTROLLER_H_
#define CHROME_BROWSER_VR_ELEMENTS_CONTROLLER_H_

#include <vector>

#include "chrome/browser/vr/elements/ui_element.h"
#include "chrome/browser/vr/renderers/base_renderer.h"

namespace vr {

// This represents a procedurally generated Daydream controller.
class Controller : public UiElement {
 public:
  Controller();

  Controller(const Controller&) = delete;
  Controller& operator=(const Controller&) = delete;

  ~Controller() override;

  void set_local_transform(const gfx::Transform& transform) {
    if (transform != local_transform_) {
      set_world_space_transform_dirty();
      local_transform_ = transform;
    }
  }

  class Renderer : public BaseRenderer {
   public:
    Renderer();

    Renderer(const Renderer&) = delete;
    Renderer& operator=(const Renderer&) = delete;

    ~Renderer() override;

    void Draw(float opacity, const gfx::Transform& view_proj_matrix);

   private:
    GLuint model_view_proj_matrix_handle_ = 0;
    GLuint color_handle_ = 0;
    GLuint opacity_handle_ = 0;
    std::vector<float> vertices_;
    std::vector<GLushort> indices_;
    std::vector<float> colors_;
    GLuint vertex_buffer_ = 0;
    GLuint color_buffer_ = 0;
    GLuint index_buffer_ = 0;
  };

 private:
  void Render(UiElementRenderer* renderer,
              const CameraModel& model) const final;

  gfx::Transform LocalTransform() const override;
  gfx::Transform GetTargetLocalTransform() const override;

  gfx::Transform local_transform_;
};

}  // namespace vr

#endif  // CHROME_BROWSER_VR_ELEMENTS_CONTROLLER_H_