Add sample RayTracing. (#361)

samples/RayTracing/CameraManipulator.hpp

@@ -0,0 +1,79 @@
+// Copyright(c) 2019, NVIDIA CORPORATION. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#pragma once
+
+#include <glm/glm.hpp>
+#include <vulkan/vulkan.hpp>
+
+namespace vk
+{
+  namespace su
+  {
+    class CameraManipulator
+    {
+      public:
+        enum class Action { None, Orbit, Dolly, Pan, LookAround };
+        enum class Mode { Examine, Fly, Walk, Trackball };
+        enum class MouseButton { None, Left, Middle, Right };
+        enum class ModifierFlagBits { Shift = 1, Ctrl = 2, Alt = 4 };
+        using ModifierFlags = vk::Flags<ModifierFlagBits, uint32_t>;
+
+      public:
+        CameraManipulator();
+
+        glm::vec3 const& getCameraPosition() const;
+        glm::vec3 const& getCenterPosition() const;
+        glm::mat4 const& getMatrix() const;
+        Mode getMode() const;
+        glm::ivec2 const& getMousePosition() const;
+        float getRoll() const;
+        float getSpeed() const;
+        glm::vec3 const& getUpVector() const;
+        glm::u32vec2 const& getWindowSize() const;
+        Action mouseMove(glm::ivec2 const& position, MouseButton mouseButton, ModifierFlags & modifiers);
+        void setLookat(const glm::vec3& cameraPosition, const glm::vec3& centerPosition, const glm::vec3& upVector);
+        void setMode(Mode mode);
+        void setMousePosition(glm::ivec2 const& position);
+        void setRoll(float roll);   // roll in radians
+        void setSpeed(float speed);
+        void setWindowSize(glm::ivec2 const& size);
+        void wheel(int value);
+
+      private:
+        void dolly(glm::vec2 const& delta);
+        void motion(glm::ivec2 const& position, Action action = Action::None);
+        void orbit(glm::vec2 const& delta, bool invert = false);
+        void pan(glm::vec2 const& delta);
+        double projectOntoTBSphere(const glm::vec2& p);
+        void trackball(glm::ivec2 const& position);
+        void update();
+
+      private:
+        glm::vec3 m_cameraPosition  = glm::vec3(10, 10, 10);
+        glm::vec3 m_centerPosition  = glm::vec3(0, 0, 0);
+        glm::vec3 m_upVector        = glm::vec3(0, 1, 0);
+        float     m_roll            = 0;                      // Rotation around the Z axis in RAD
+        glm::mat4 m_matrix          = glm::mat4(1);
+
+        glm::u32vec2 m_windowSize   = glm::u32vec2(1, 1);
+
+        float       m_speed         = 30.0f;
+        glm::ivec2  m_mousePosition = glm::ivec2(0, 0);
+
+        Mode m_mode                 = Mode::Examine;
+    };
+  } // namespace su
+}  // namespace vk