Implement active box using new draw item on draw layers

scwx-qt/source/scwx/qt/gl/draw/rectangle.cpp

@@ -0,0 +1,286 @@
+#include <scwx/qt/gl/draw/rectangle.hpp>
+
+#include <optional>
+
+#include <boost/log/trivial.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace gl
+{
+namespace draw
+{
+
+static const std::string logPrefix_ = "[scwx::qt::gl::draw::rectangle] ";
+
+static constexpr size_t NUM_RECTANGLES         = 5;
+static constexpr size_t NUM_TRIANGLES          = NUM_RECTANGLES * 2;
+static constexpr size_t VERTICES_PER_TRIANGLE  = 3;
+static constexpr size_t VERTICES_PER_RECTANGLE = VERTICES_PER_TRIANGLE * 2;
+static constexpr size_t POINTS_PER_VERTEX      = 7;
+static constexpr size_t BUFFER_LENGTH =
+   NUM_TRIANGLES * VERTICES_PER_TRIANGLE * POINTS_PER_VERTEX;
+
+class RectangleImpl
+{
+public:
+   explicit RectangleImpl(OpenGLFunctions& gl) :
+       gl_ {gl},
+       dirty_ {false},
+       visible_ {true},
+       x_ {0.0f},
+       y_ {0.0f},
+       z_ {0.0f},
+       width_ {0.0f},
+       height_ {0.0f},
+       borderColor_ {0, 0, 0, 0},
+       borderWidth_ {0.0f},
+       fillColor_ {std::nullopt},
+       vao_ {GL_INVALID_INDEX},
+       vbo_ {GL_INVALID_INDEX}
+   {
+   }
+
+   ~RectangleImpl() {}
+
+   OpenGLFunctions& gl_;
+
+   bool dirty_;
+
+   bool  visible_;
+   float x_;
+   float y_;
+   float z_;
+   float width_;
+   float height_;
+
+   float                     borderWidth_;
+   boost::gil::rgba8_pixel_t borderColor_;
+
+   std::optional<boost::gil::rgba8_pixel_t> fillColor_;
+
+   GLuint vao_;
+   GLuint vbo_;
+
+   void Update();
+};
+
+Rectangle::Rectangle(OpenGLFunctions& gl) :
+    DrawItem(), p(std::make_unique<RectangleImpl>(gl))
+{
+}
+Rectangle::~Rectangle() = default;
+
+Rectangle::Rectangle(Rectangle&&) noexcept = default;
+Rectangle& Rectangle::operator=(Rectangle&&) noexcept = default;
+
+void Rectangle::Initialize()
+{
+   gl::OpenGLFunctions& gl = p->gl_;
+
+   gl.glGenVertexArrays(1, &p->vao_);
+   gl.glGenBuffers(1, &p->vbo_);
+
+   gl.glBindVertexArray(p->vao_);
+   gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
+   gl.glBufferData(
+      GL_ARRAY_BUFFER, sizeof(float) * BUFFER_LENGTH, nullptr, GL_DYNAMIC_DRAW);
+
+   gl.glVertexAttribPointer(0,
+                            3,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            POINTS_PER_VERTEX * sizeof(float),
+                            static_cast<void*>(0));
+   gl.glEnableVertexAttribArray(0);
+
+   gl.glVertexAttribPointer(1,
+                            4,
+                            GL_FLOAT,
+                            GL_FALSE,
+                            POINTS_PER_VERTEX * sizeof(float),
+                            reinterpret_cast<void*>(3 * sizeof(float)));
+   gl.glEnableVertexAttribArray(1);
+
+   p->dirty_ = true;
+}
+
+void Rectangle::Render()
+{
+   if (p->visible_)
+   {
+      gl::OpenGLFunctions& gl = p->gl_;
+
+      gl.glBindVertexArray(p->vao_);
+      gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
+
+      p->Update();
+
+      if (p->fillColor_.has_value())
+      {
+         // Draw fill
+         gl.glDrawArrays(GL_TRIANGLES, 24, 6);
+      }
+
+      if (p->borderWidth_ > 0.0f)
+      {
+         // Draw border
+         gl.glDrawArrays(GL_TRIANGLES, 0, 24);
+      }
+   }
+}
+
+void Rectangle::Deinitialize()
+{
+   gl::OpenGLFunctions& gl = p->gl_;
+
+   gl.glDeleteVertexArrays(1, &p->vao_);
+   gl.glDeleteBuffers(1, &p->vbo_);
+}
+
+void Rectangle::SetBorder(float width, boost::gil::rgba8_pixel_t color)
+{
+   if (p->borderWidth_ != width || p->borderColor_ != color)
+   {
+      p->borderWidth_ = width;
+      p->borderColor_ = color;
+      p->dirty_       = true;
+   }
+}
+
+void Rectangle::SetFill(boost::gil::rgba8_pixel_t color)
+{
+   if (p->fillColor_ != color)
+   {
+      p->fillColor_ = color;
+      p->dirty_     = true;
+   }
+}
+
+void Rectangle::SetPosition(float x, float y)
+{
+   if (p->x_ != x || p->y_ != y)
+   {
+      p->x_     = x;
+      p->y_     = y;
+      p->dirty_ = true;
+   }
+}
+
+void Rectangle::SetSize(float width, float height)
+{
+   if (p->width_ != width || p->height_ != height)
+   {
+      p->width_  = width;
+      p->height_ = height;
+      p->dirty_  = true;
+   }
+}
+
+void Rectangle::SetVisible(bool visible)
+{
+   p->visible_ = visible;
+}
+
+void RectangleImpl::Update()
+{
+   if (dirty_)
+   {
+      gl::OpenGLFunctions& gl = gl_;
+
+      const float lox = x_;
+      const float rox = x_ + width_;
+      const float boy = y_;
+      const float toy = y_ + height_;
+
+      const float lix = lox + borderWidth_;
+      const float rix = rox - borderWidth_;
+
+      const float biy = boy + borderWidth_;
+      const float tiy = toy - borderWidth_;
+
+      const float bc0 = borderColor_[0] / 255.0f;
+      const float bc1 = borderColor_[1] / 255.0f;
+      const float bc2 = borderColor_[2] / 255.0f;
+      const float bc3 = borderColor_[3] / 255.0f;
+
+      float fc0 = 0.0f;
+      float fc1 = 0.0f;
+      float fc2 = 0.0f;
+      float fc3 = 0.0f;
+
+      if (fillColor_.has_value())
+      {
+         boost::gil::rgba8_pixel_t& fc = fillColor_.value();
+
+         fc0 = fc[0] / 255.0f;
+         fc1 = fc[1] / 255.0f;
+         fc2 = fc[2] / 255.0f;
+         fc3 = fc[3] / 255.0f;
+      }
+
+      const float buffer[NUM_RECTANGLES][VERTICES_PER_RECTANGLE]
+                        [POINTS_PER_VERTEX] = //
+         {                                    //
+
+          // Left Border
+          {
+             {lox, boy, z_, bc0, bc1, bc2, bc3}, // BL
+             {lox, toy, z_, bc0, bc1, bc2, bc3}, // TL
+             {lix, boy, z_, bc0, bc1, bc2, bc3}, // BR
+             {lix, boy, z_, bc0, bc1, bc2, bc3}, // BR
+             {lix, toy, z_, bc0, bc1, bc2, bc3}, // TR
+             {lox, toy, z_, bc0, bc1, bc2, bc3}  // TL
+          },
+          // Right Border
+          {
+             {rox, boy, z_, bc0, bc1, bc2, bc3}, // BR
+             {rox, toy, z_, bc0, bc1, bc2, bc3}, // TR
+             {rix, boy, z_, bc0, bc1, bc2, bc3}, // BL
+             {rix, boy, z_, bc0, bc1, bc2, bc3}, // BL
+             {rix, toy, z_, bc0, bc1, bc2, bc3}, // TL
+             {rox, toy, z_, bc0, bc1, bc2, bc3}  // TR
+          },
+          // Top Border
+          {
+             {lox, toy, z_, bc0, bc1, bc2, bc3}, // TL
+             {rox, toy, z_, bc0, bc1, bc2, bc3}, // TR
+             {rox, tiy, z_, bc0, bc1, bc2, bc3}, // BR
+             {rox, tiy, z_, bc0, bc1, bc2, bc3}, // BR
+             {lox, tiy, z_, bc0, bc1, bc2, bc3}, // BL
+             {lox, toy, z_, bc0, bc1, bc2, bc3}  // TL
+          },
+          // Bottom Border
+          {
+             {lox, boy, z_, bc0, bc1, bc2, bc3}, // BL
+             {rox, boy, z_, bc0, bc1, bc2, bc3}, // BR
+             {rox, biy, z_, bc0, bc1, bc2, bc3}, // TR
+             {rox, biy, z_, bc0, bc1, bc2, bc3}, // TR
+             {lox, biy, z_, bc0, bc1, bc2, bc3}, // TL
+             {lox, boy, z_, bc0, bc1, bc2, bc3}  // BL
+          },
+          // Fill
+          {
+             {lox, toy, z_, fc0, fc1, fc2, fc3}, // TL
+             {rox, toy, z_, fc0, fc1, fc2, fc3}, // TR
+             {rox, boy, z_, fc0, fc1, fc2, fc3}, // BR
+             {rox, boy, z_, fc0, fc1, fc2, fc3}, // BR
+             {lox, boy, z_, fc0, fc1, fc2, fc3}, // BL
+             {lox, toy, z_, fc0, fc1, fc2, fc3}  // TL
+          }};
+
+      gl.glBufferData(GL_ARRAY_BUFFER,
+                      sizeof(float) * BUFFER_LENGTH,
+                      buffer,
+                      GL_DYNAMIC_DRAW);
+
+      dirty_ = false;
+   }
+}
+
+} // namespace draw
+} // namespace gl
+} // namespace qt
+} // namespace scwx