implement motion controllers and vr drawing with brush preview

src/brush.h

@@ -42,8 +42,8 @@ public:
 struct StrokeSample
 {
     glm::vec3 col = { 0, 0, 0 };
-    glm::vec2 pos = { 0, 0 };
-    glm::vec2 origin = { 0,0 };
+    glm::vec3 pos = { 0, 0, 0 };
+    glm::vec3 origin = { 0, 0, 0 };
     float size = 0;
     float flow = 0;
     float angle = 0;
@@ -76,7 +76,7 @@ class Stroke
 public:
     struct Keypoint
     {
-        glm::vec2 pos = { 0, 0 };
+        glm::vec3 pos = { 0, 0, 0 };
         float pressure = 0;
         float dist = 0;
     };
@@ -96,16 +96,16 @@ public:
     cbuffer<glm::vec3, 3> m_hsv_jitter;
     StrokeSample m_prev_sample;
     std::vector<Keypoint> m_keypoints;
-    std::vector<std::pair<glm::vec2, float>> m_hold_points;
+    std::vector<std::pair<glm::vec3, float>> m_hold_points;
     std::vector<StrokeSample> m_samples;
     int m_last_kp;
     std::minstd_rand prng;
     void start(const ui::Brush& brush);
-    void add_point(glm::vec2 pos, float pressure);
+    void add_point(glm::vec3 pos, float pressure);
     void reset(bool clear_keypoints = false);
     bool has_sample();
     std::vector<StrokeSample> compute_samples();
-    StrokeSample randomize_sample(const glm::vec2& pos, float pressure, float curve_angle);
+    StrokeSample randomize_sample(const glm::vec3& pos, float pressure, float curve_angle);
 };
 
 NS_END