Ejemplo n.º 1
0
    void contextSwitch(QOpenGLContext *_context, ContextFunctor f) {
      auto *_current = QOpenGLContext::currentContext();
      if (!_current || !_current->isValid()) return;

      if (_context != _current) {
        _context->makeCurrent(_current->surface());
      }

      withCurrentContext(f);

      if (_context != _current) {
        _current->makeCurrent(_current->surface());
      }
    }
Ejemplo n.º 2
0
    void useShader(QOpenGLShaderProgram& _s,
                   std::function<void(UniformHandler&)>f) {
      withCurrentContext([&](QOpenGLFunctions& _gl) {
        _s.bind();
        {
          UniformHandler _handler(_gl, _s);
          f(_handler);

          // Destructor of handler is called here implicitly
          // by RAII to unbind all textures
        }
        _s.release();
      });
    }
Ejemplo n.º 3
0
    void Image::update()
    {
      if (image_.width() == 0) return;
      if (texture_) return;

      withCurrentContext([&](QOpenGLFunctions& _) {

        texture_.reset(new QOpenGLTexture(QOpenGLTexture::TargetRectangle));
        texture_->setData(image_);
        texture_->setMinMagFilters(
          QOpenGLTexture::Linear,
          QOpenGLTexture::Linear);
        texture_->allocateStorage();
      });
    }
Ejemplo n.º 4
0
    void Circle::drawLine(QPointF const& _pos, float _rX, float _rY) const
    {
      withCurrentContext([&](QOpenGLFunctions& _) {
        glPushMatrix();
        glScalef(_rX, _rY, 1.0);
        glTranslatef(_pos.x() / _rX, _pos.y() / _rY, 0.0);
        glEnableClientState(GL_VERTEX_ARRAY);
        _.glBindBuffer(GL_ARRAY_BUFFER, vertexVbo_.id());

        glVertexPointer(2, GL_FLOAT, 0, nullptr);
        _.glDrawArrays(GL_LINE_LOOP, 1, numberSegments);

        _.glBindBuffer(GL_ARRAY_BUFFER,         0);
        glDisableClientState(GL_VERTEX_ARRAY);
        glPopMatrix();
      });
    }
Ejemplo n.º 5
0
    void InputPreview::paintGL()
    {
      if (!input() || !isVisible()) return;

      makeCurrent();

      if (!shader_) {
        primaryContextSwitch([&](QOpenGLFunctions& _) {
          visual::initShader(shader_,"textureRect");
        });
      }

      withCurrentContext([this](QOpenGLFunctions& _)
      {
        _.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
        auto _rect = viewRect();

        visual::viewport(this);

        /// Setup orthogonal projection
        glMatrixMode(GL_PROJECTION);
        {
          glLoadIdentity();
          QMatrix4x4 _m;
          _m.ortho(_rect.left(), _rect.right(), _rect.top(), _rect.bottom(), -1.0,
                   1.0);
          glMultMatrixf(_m.constData());
        }

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

        shader_->bind();
        _.glBindTexture(GL_TEXTURE_RECTANGLE, input_->textureId());
        visual::Rectangle::draw(input_->size());
        _.glBindTexture(GL_TEXTURE_RECTANGLE, 0);
        shader_->release();
      });

      paintGLDone();
    }