CGlCanvasBase.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
 
#include "gui-precomp.h"  // Precompiled headers
#include <mrpt/gui/CGlCanvasBase.h>
#include <mrpt/system/CTicTac.h>
 
#if MRPT_HAS_OPENGL_GLUT
#ifdef _WIN32
// Windows:
#include <windows.h>
#endif
 
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <GLUT/glut.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#ifdef HAVE_FREEGLUT_EXT_H
#include <GL/freeglut_ext.h>
#endif
#endif
#endif  // MRPT_HAS_OPENGL_GLUT
 
using namespace mrpt;
using namespace mrpt::gui;
using namespace mrpt::opengl;
using namespace std;
using mrpt::system::CTicTac;
 
float CGlCanvasBase::SENSIBILITY_DEG_PER_PIXEL = 0.1f;
 
void CGlCanvasBase::setMinimumZoom(float zoom) { m_minZoom = zoom; }
void CGlCanvasBase::setMaximumZoom(float zoom) { m_maxZoom = zoom; }
void CGlCanvasBase::setMousePos(int x, int y)
{
        m_mouseClickX = x;
        m_mouseClickY = y;
}
 
void CGlCanvasBase::setMouseClicked(bool is) { mouseClicked = is; }
void CGlCanvasBase::updateZoom(CamaraParams& params, int x, int y) const
{
        float zoom = params.cameraZoomDistance * exp(0.01 * (y - m_mouseClickY));
        if (zoom <= m_minZoom || (m_maxZoom != -1.0f && m_maxZoom <= zoom)) return;
        params.cameraZoomDistance = zoom;
        if (params.cameraZoomDistance < 0.01) params.cameraZoomDistance = 0.01f;
 
        float Az = -0.05 * (x - m_mouseClickX);
        float D = 0.001 * params.cameraZoomDistance;
        params.cameraPointingZ += D * Az;
}
 
void CGlCanvasBase::updateZoom(CamaraParams& params, float delta) const
{
        float zoom = params.cameraZoomDistance * (1 - 0.03f * (delta / 120.0f));
        if (zoom <= m_minZoom || (m_maxZoom != -1.0f && m_maxZoom <= zoom)) return;
 
        params.cameraZoomDistance = zoom;
}
 
void CGlCanvasBase::updateRotate(CamaraParams& params, int x, int y) const
{
        const float dis = max(0.01f, (params.cameraZoomDistance));
        float eye_x = params.cameraPointingX +
                                  dis * cos(DEG2RAD(params.cameraAzimuthDeg)) *
                                          cos(DEG2RAD(params.cameraElevationDeg));
        float eye_y = params.cameraPointingY +
                                  dis * sin(DEG2RAD(params.cameraAzimuthDeg)) *
                                          cos(DEG2RAD(params.cameraElevationDeg));
        float eye_z =
                params.cameraPointingZ + dis * sin(DEG2RAD(params.cameraElevationDeg));
 
        // Orbit camera:
        float A_AzimuthDeg = -SENSIBILITY_DEG_PER_PIXEL * (x - m_mouseClickX);
        params.cameraAzimuthDeg += A_AzimuthDeg;
 
        float A_ElevationDeg = SENSIBILITY_DEG_PER_PIXEL * (y - m_mouseClickY);
        params.setElevationDeg(params.cameraElevationDeg + A_ElevationDeg);
 
        // Move cameraPointing pos:
        params.cameraPointingX = eye_x -
                                                         dis * cos(DEG2RAD(params.cameraAzimuthDeg)) *
                                                                 cos(DEG2RAD(params.cameraElevationDeg));
        params.cameraPointingY = eye_y -
                                                         dis * sin(DEG2RAD(params.cameraAzimuthDeg)) *
                                                                 cos(DEG2RAD(params.cameraElevationDeg));
        params.cameraPointingZ =
                eye_z - dis * sin(DEG2RAD(params.cameraElevationDeg));
}
 
void CGlCanvasBase::updateOrbitCamera(CamaraParams& params, int x, int y) const
{
        params.cameraAzimuthDeg -= 0.2 * (x - m_mouseClickX);
        params.setElevationDeg(
                params.cameraElevationDeg + 0.2 * (y - m_mouseClickY));
}
 
void CGlCanvasBase::updateLastPos(int x, int y)
{
        m_mouseLastX = x;
        m_mouseLastY = y;
}
 
void CGlCanvasBase::resizeViewport(int w, int h)
{
#if MRPT_HAS_OPENGL_GLUT
        if (w == -1 || h == -1) return;
 
        glViewport(0, 0, (GLint)w, (GLint)h);
#endif
}
 
void CGlCanvasBase::clearColors()
{
#if MRPT_HAS_OPENGL_GLUT
        glClearColor(clearColorR, clearColorG, clearColorB, clearColorA);
#endif
}
 
void CGlCanvasBase::updatePan(CamaraParams& params, int x, int y) const
{
        float Ay = -(x - m_mouseClickX);
        float Ax = -(y - m_mouseClickY);
        float D = 0.001 * params.cameraZoomDistance;
        params.cameraPointingX += D * (Ax * cos(DEG2RAD(params.cameraAzimuthDeg)) -
                                                                   Ay * sin(DEG2RAD(params.cameraAzimuthDeg)));
        params.cameraPointingY += D * (Ax * sin(DEG2RAD(params.cameraAzimuthDeg)) +
                                                                   Ay * cos(DEG2RAD(params.cameraAzimuthDeg)));
}
 
CGlCanvasBase::CamaraParams CGlCanvasBase::cameraParams() const
{
        return m_cameraParams;
}
 
const CGlCanvasBase::CamaraParams& CGlCanvasBase::getRefCameraParams() const
{
        return m_cameraParams;
}
 
void CGlCanvasBase::setCameraParams(const CGlCanvasBase::CamaraParams& params)
{
        m_cameraParams = params;
}
 
float CGlCanvasBase::getZoomDistance() const
{
        return m_cameraParams.cameraZoomDistance;
}
 
void CGlCanvasBase::setZoomDistance(float zoom)
{
        m_cameraParams.cameraZoomDistance = zoom;
}
 
CCamera& CGlCanvasBase::updateCameraParams(CCamera& cam) const
{
        cam.setPointingAt(
                m_cameraParams.cameraPointingX, m_cameraParams.cameraPointingY,
                m_cameraParams.cameraPointingZ);
        cam.setZoomDistance(m_cameraParams.cameraZoomDistance);
        cam.setAzimuthDegrees(m_cameraParams.cameraAzimuthDeg);
        cam.setElevationDegrees(m_cameraParams.cameraElevationDeg);
        cam.setProjectiveModel(m_cameraParams.cameraIsProjective);
        cam.setProjectiveFOVdeg(m_cameraParams.cameraFOV);
 
        return cam;
}
 
void CGlCanvasBase::setUseCameraFromScene(bool is) { useCameraFromScene = is; }
bool CGlCanvasBase::getUseCameraFromScene() const { return useCameraFromScene; }
void CGlCanvasBase::setAzimuthDegrees(float ang)
{
        m_cameraParams.cameraAzimuthDeg = ang;
}
 
void CGlCanvasBase::setElevationDegrees(float ang)
{
        m_cameraParams.cameraElevationDeg = ang;
}
 
float CGlCanvasBase::getAzimuthDegrees() const
{
        return m_cameraParams.cameraAzimuthDeg;
}
 
float CGlCanvasBase::getElevationDegrees() const
{
        return m_cameraParams.cameraElevationDeg;
}
 
void CGlCanvasBase::setCameraProjective(bool is)
{
        m_cameraParams.cameraIsProjective = is;
}
 
bool CGlCanvasBase::isCameraProjective() const
{
        return m_cameraParams.cameraIsProjective;
}
 
void CGlCanvasBase::setCameraFOV(float FOV) { m_cameraParams.cameraFOV = FOV; }
float CGlCanvasBase::cameraFOV() const { return m_cameraParams.cameraFOV; }
void CGlCanvasBase::setClearColors(float r, float g, float b, float a)
{
        clearColorR = r;
        clearColorG = g;
        clearColorB = b;
        clearColorA = a;
}
 
float CGlCanvasBase::getClearColorR() const { return clearColorR; }
float CGlCanvasBase::getClearColorG() const { return clearColorG; }
float CGlCanvasBase::getClearColorB() const { return clearColorB; }
float CGlCanvasBase::getClearColorA() const { return clearColorA; }
void CGlCanvasBase::setOpenGLSceneRef(COpenGLScene::Ptr scene)
{
        m_openGLScene = scene;
}
 
void CGlCanvasBase::setCameraPointing(float pointX, float pointY, float pointZ)
{
        m_cameraParams.cameraPointingX = pointX;
        m_cameraParams.cameraPointingY = pointY;
        m_cameraParams.cameraPointingZ = pointZ;
}
 
float CGlCanvasBase::getCameraPointingX() const
{
        return m_cameraParams.cameraPointingX;
}
 
float CGlCanvasBase::getCameraPointingY() const
{
        return m_cameraParams.cameraPointingY;
}
 
float CGlCanvasBase::getCameraPointingZ() const
{
        return m_cameraParams.cameraPointingZ;
}
 
double CGlCanvasBase::renderCanvas(int width, int height)
{
#if MRPT_HAS_OPENGL_GLUT
        CTicTac tictac;
        double At = 0.1;
 
        try
        {
                // Call PreRender user code:
                preRender();
 
                glPushAttrib(GL_ALL_ATTRIB_BITS);
 
                // Set static configs:
                glEnable(GL_DEPTH_TEST);
                glEnable(GL_ALPHA_TEST);
                glEnable(GL_TEXTURE_2D);
 
                // PART 1a: Set the viewport
                // --------------------------------------
                resizeViewport((GLsizei)width, (GLsizei)height);
 
                // Set the background color:
                clearColors();
 
                if (m_openGLScene)
                {
                        // Set the camera params in the scene:
                        if (!useCameraFromScene)
                        {
                                COpenGLViewport::Ptr view = m_openGLScene->getViewport("main");
                                if (!view)
                                {
                                        THROW_EXCEPTION(
                                                "Fatal error: there is no 'main' viewport in the 3D "
                                                "scene!");
                                }
 
                                mrpt::opengl::CCamera& cam = view->getCamera();
                                updateCameraParams(cam);
                        }
 
                        // PART 2: Set the MODELVIEW matrix
                        // --------------------------------------
                        glMatrixMode(GL_MODELVIEW);
                        glLoadIdentity();
 
                        tictac.Tic();
 
                        // PART 3: Draw primitives:
                        // --------------------------------------
                        m_openGLScene->render();
 
                }  // end if "m_openGLScene!=nullptr"
 
                postRender();
 
                // Flush & swap buffers to disply new image:
                glFlush();
                swapBuffers();
 
                At = tictac.Tac();
 
                glPopAttrib();
        }
        catch (std::exception& e)
        {
                glPopAttrib();
                const std::string err_msg =
                        std::string("[CWxGLCanvasBase::Render] Exception!: ") +
                        std::string(e.what());
                std::cerr << err_msg;
                renderError(err_msg);
        }
        catch (...)
        {
                glPopAttrib();
                std::cerr << "Runtime error!" << std::endl;
        }
 
        return At;
#else
        THROW_EXCEPTION("Cant render: MRPT was built without OpenGL");
#endif
}
 
void CGlCanvasBase::CamaraParams::setElevationDeg(float deg)
{
        cameraElevationDeg = deg;
 
        if (cameraElevationDeg < -90.0f)
                cameraElevationDeg = -90.0f;
        else if (cameraElevationDeg > 90.0f)
                cameraElevationDeg = 90.0f;
}