add flood fill mode with custom cursor

src/canvas_modes.cpp

@@ -1548,3 +1548,62 @@ void CanvasModeTransform::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
         break;
     }
 }
+
+void CanvasModeFloodFill::init()
+{
+    TextureManager::load(m_cursor_path.c_str());
+}
+
+////////////////////////////////////////////////////////////////////
+
+void CanvasModeFloodFill::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
+{
+#if defined(__IOS__)
+    m_draw_tip = (me->m_source == kEventSource::Mouse && me->m_type != kEventType::MouseUpL);
+#else
+    m_draw_tip = (me->m_source == kEventSource::Mouse || me->m_source == kEventSource::Stylus);
+#endif
+    if (Canvas::I->m_touch_lock && me->m_source == kEventSource::Touch)
+        return;
+
+    switch (me->m_type)
+    {
+    case kEventType::MouseUpL:
+        glm::vec3 ro, rd, hit, n;
+        glm::vec2 pos;
+        int plane;
+        if (Canvas::I->point_trace(loc, ro, rd, hit, pos, n, plane))
+        {
+            std::map<int, std::unique_ptr<bool[]>> plane_mask;
+            std::unique_ptr<glm::vec4> color;
+            Canvas::I->flood_fill(Canvas::I->m_current_layer_idx, plane, { (glm::ivec2)pos },
+                plane_mask, 200, Canvas::I->m_current_brush->m_tip_color, color);
+        }
+        break;
+    default:
+        break;
+    }
+}
+
+void CanvasModeFloodFill::on_Draw(const glm::mat4& ortho, const glm::mat4& proj, const glm::mat4& camera)
+{
+    if (m_draw_tip)
+    {
+        ShaderManager::use(kShader::Texture);
+        ShaderManager::u_mat4(kShaderUniform::MVP, 
+            glm::scale(glm::vec3(1, -1, 1))
+            * ortho
+            * glm::translate(glm::vec3(Canvas::I->m_cur_pos, 0.f))
+            * glm::scale(glm::vec3(32, 32, 1))
+            * glm::translate(glm::vec3(0.5f, -0.5f, 0))
+        );
+        ShaderManager::u_int(kShaderUniform::Tex, 0);
+    
+        auto& t = TextureManager::get(m_cursor_id);
+    
+        Canvas::I->m_sampler_linear.bind(0);
+        t.bind();
+        Canvas::I->m_plane.draw_fill();
+        t.unbind();
+    }
+}