mixer brush wip

engine/canvas.h

@@ -54,11 +54,13 @@ public:
     bool m_dirty_stroke = false;
 
     static Canvas* I;
+    NodeCanvas* m_node = nullptr;
     bool m_alpha_lock = false;
     bool m_touch_lock = true;
     glm::mat4 m_mv{ 1 };
     glm::mat4 m_proj{ 1 };
     glm::vec4 m_box{ 0 };
+    glm::vec4 m_vp{ 0 };
     glm::vec2 m_pan{ 0 };
     int m_width = 0;
     int m_height = 0;
@@ -73,6 +75,7 @@ public:
     Layer m_smask; // selection mask
     bool m_smask_active = false;
     RTT m_tmp[6];
+    RTT m_mixer;
     Texture2D m_brush_mix;
     Texture2D m_tex[6];
     Texture2D m_tex2[6];
@@ -88,6 +91,7 @@ public:
     Sampler m_sampler_bg;
     Sampler m_sampler_mask;
     Sampler m_sampler_stencil;
+    Sampler m_sampler_mix;
     glm::vec2 m_cam_rot{ 0 };
     glm::vec3 m_cam_pos{ 0 };
     float m_cam_fov = 85;
@@ -124,6 +128,7 @@ public:
     void layer_merge(int source_idx, int dest_idx);
     void stroke_start(glm::vec2 point, float pressure, const ui::Brush& brush);
     void stroke_update(glm::vec2 point, float pressure);
+    void stroke_draw_mix();
     void stroke_draw();
     void stroke_end();
     void stroke_cancel();
@@ -152,7 +157,6 @@ public:
     void inject_xmp(std::string jpg_path);
     ui::Image thumbnail_generate(int w, int h);
     ui::Image thumbnail_read(std::string data_path);
-    void preview_generate();
     void draw_objects(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)>);
     void draw_objects(std::function<void(const glm::mat4& camera, const glm::mat4& proj, int i)>, Layer& layer);
     bool ray_intersect(glm::vec3 ray_origin, glm::vec3 ray_dir, glm::vec3 plane_origin,