matrixProjection.zip

/////////////////////////////////////////////////////////////////////////////// // ModelGL.cpp // =========== // Model component of OpenGL // // AUTHOR: Song Ho Ahn (song.ahn@gmail.com) // CREATED: 2008-10-02 // UPDATED: 2013-03-01 /////////////////////////////////////////////////////////////////////////////// #ifdef _WIN32 #include <windows.h> // include windows.h to avoid thousands of compile errors even though this class is not depending on Windows #endif #ifdef __APPLE__ #include <OpenGL/gl.h> #include <OpenGL/glu.h> #else #include <GL/gl.h> #include <GL/glu.h> #endif #include <cmath> #include "ModelGL.h" #include "cameraSimple.h" // 3D mesh of camera // constants const float DEG2RAD = 3.141593f / 180; const float FOV_Y = 60.0f; const float NEAR_PLANE = 1.0f; const float FAR_PLANE = 100.0f; const float CAMERA_ANGLE_X = 45.0f; // pitch in degree const float CAMERA_ANGLE_Y = -45.0f; // heading in degree const float CAMERA_DISTANCE = 25.0f; // camera distance // default projection matrix values const float DEFAULT_LEFT = -0.5f; const float DEFAULT_RIGHT = 0.5f; const float DEFAULT_BOTTOM = -0.5f; const float DEFAULT_TOP = 0.5f; const float DEFAULT_NEAR = 1.0f; const float DEFAULT_FAR = 10.0f; /////////////////////////////////////////////////////////////////////////////// // default ctor /////////////////////////////////////////////////////////////////////////////// ModelGL::ModelGL() : windowWidth(0), windowHeight(0), mouseLeftDown(false), mouseRightDown(false), drawModeChanged(false), drawMode(0), cameraAngleX(CAMERA_ANGLE_X), cameraAngleY(CAMERA_ANGLE_Y), cameraDistance(CAMERA_DISTANCE), windowSizeChanged(false), projectionLeft(DEFAULT_LEFT), projectionRight(DEFAULT_RIGHT), projectionBottom(DEFAULT_BOTTOM), projectionTop(DEFAULT_TOP), projectionNear(DEFAULT_NEAR), projectionFar(DEFAULT_FAR), quadricId(0), projectionMode(0) { bgColor[0] = bgColor[1] = bgColor[2] = bgColor[3] = 0; // init projection matrix setFrustum(projectionLeft, projectionRight, projectionBottom, projectionTop, projectionNear, projectionFar); // model, view, modelview matrices are fixed in this app matrixModel.identity(); matrixView.identity(); matrixView.translate(0, 0, -7); // move the camera away from 3D objects matrixModelView = matrixView * matrixModel; } /////////////////////////////////////////////////////////////////////////////// // destructor /////////////////////////////////////////////////////////////////////////////// ModelGL::~ModelGL() { } /////////////////////////////////////////////////////////////////////////////// // initialize OpenGL states and scene /////////////////////////////////////////////////////////////////////////////// void ModelGL::init() { glShadeModel(GL_SMOOTH); // shading mathod: GL_SMOOTH or GL_FLAT glPixelStorei(GL_UNPACK_ALIGNMENT, 4); // 4-byte pixel alignment // enable /disable features glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); //glHint(GL_LINE_SMOOTH_HINT, GL_NICEST); //glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST); glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING); glEnable(GL_TEXTURE_2D); glEnable(GL_CULL_FACE); glEnable(GL_BLEND); glEnable(GL_SCISSOR_TEST); // track material ambient and diffuse from surface color, call it before glEnable(GL_COLOR_MATERIAL) glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE); glEnable(GL_COLOR_MATERIAL); glClearColor(bgColor[0], bgColor[1], bgColor[2], bgColor[3]); // background color glClearStencil(0); // clear stencil buffer glClearDepth(1.0f); // 0 is near, 1 is far glDepthFunc(GL_LEQUAL); initLights(); // create a GLU quadric object quadricId = gluNewQuadric(); gluQuadricDrawStyle(quadricId, GLU_FILL); } /////////////////////////////////////////////////////////////////////////////// // clean up OpenGL objects /////////////////////////////////////////////////////////////////////////////// void ModelGL::quit() { gluDeleteQuadric(quadricId); } /////////////////////////////////////////////////////////////////////////////// // initialize lights /////////////////////////////////////////////////////////////////////////////// void ModelGL::initLights() { // set up light colors (ambient, diffuse, specular) GLfloat lightKa[] = {.0f, .0f, .0f, 1.0f}; // ambient light GLfloat lightKd[] = {.9f, .9f, .9f, 1.0f}; // diffuse light GLfloat lightKs[] = {1, 1, 1, 1}; // specular light glLightfv(GL_LIGHT0, GL_AMBIENT, lightKa); glLightfv(GL_LIGHT0, GL_DIFFUSE, lightKd); glLightfv(GL_LIGHT0, GL_SPECULAR, lightKs); // position the light in eye space float lightPos[4] = {0, 0, 1, 0}; // directional light glLightfv(GL_LIGHT0, GL_POSITION, lightPos); glEnable(GL_LIGHT0); // MUST enable each light source after configuration } /////////////////////////////////////////////////////////////////////////////// // set camera position and lookat direction /////////////////////////////////////////////////////////////////////////////// void ModelGL::setCamera(float posX, float posY, float posZ, float targetX, float targetY, float targetZ) { float forward[4]; float up[4]; float left[4]; float position[4]; float invLength; // determine forward vector (direction reversed because it is camera) forward[0] = posX - targetX; // x forward[1] = posY - targetY; // y forward[2] = posZ - targetZ; // z forward[3] = 0.0f; // w // normalize it without w-component invLength = 1.0f / sqrtf(forward[0]*forward[0] + forward[1]*forward[1] + forward[2]*forward[2]); forward[0] *= invLength; forward[1] *= invLength; forward[2] *= invLength; // assume up direction is straight up up[0] = 0.0f; // x up[1] = 1.0f; // y up[2] = 0.0f; // z up[3] = 0.0f; // w // compute left vector with cross product left[0] = up[1]*forward[2] - up[2]*forward[1]; // x left[1] = up[2]*forward[0] - up[0]*forward[2]; // y left[2] = up[0]*forward[1] - up[1]*forward[0]; // z left[3] = 1.0f; // w // re-compute orthogonal up vector up[0] = forward[1]*left[2] - forward[2]*left[1]; // x up[1] = forward[2]*left[0] - forward[0]*left[2]; // y up[2] = forward[0]*left[1] - forward[1]*left[0]; // z up[3] = 0.0f; // w // camera position position[0] = -posX; position[1] = -posY; position[2] = -posZ; position[3] = 1.0f; // copy axis vectors to matrix matrixView.identity(); matrixView.setColumn(0, left); matrixView.setColumn(1, up); matrixView.setColumn(2, forward); matrixView.setColumn(3, position); } /////////////////////////////////////////////////////////////////////////////// // set rendering window size /////////////////////////////////////////////////////////////////////////////// void ModelGL::setWindowSize(int width, int height) { // assign the width/height of viewport windowWidth = width; windowHeight = height; windowSizeChanged = true; } /////////////////////////////////////////////////////////////////////////////// // configure projection and viewport /////////////////////////////////////////////////////////////////////////////// void ModelGL::setViewpor