GLSL CUSTOM VIEW JP FRAMEWORK.

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OPEN GL.


/* *Author from JP.Lee *Ver. 0.1b *This is first OpenGL Shader preview framwork via freeglut api. *5/7/2013 first update. */ #include <GL/glut.h> #include <GL/freeglut.h> #include <stdio.h> #define GLUT_KEY_ESCAPE 27 const GLsizei windowWidth = 1280; const GLsizei windowHeight = 720; GLfloat viewFOVY = 45.0f; GLfloat cubePositionZ = -5.0f; GLfloat cubeRotateX = 45.0f; GLfloat cubeRotateY = 45.0f; bool keys[255]; const char* myTitle = "JP OpenGL VIEWER"; GLboolean checkKeys(GLvoid) { const GLfloat speed = 1.0f; const GLfloat zoom = 1.0f; const GLfloat sensitive = 5.0f; if ( keys[ GLUT_KEY_ESCAPE ]) return true; if ( keys[GLUT_KEY_LEFT]) cubeRotateY -= speed; if(keys[GLUT_KEY_RIGHT]) cubeRotateY += speed; if(keys[GLUT_KEY_UP]) cubeRotateX -= speed; if(keys[GLUT_KEY_DOWN]) cubeRotateX += speed; if(keys[GLUT_KEY_HOME]) cubePositionZ -= zoom/sensitive; if(keys[GLUT_KEY_END]) cubePositionZ += zoom/sensitive; return false; } /***********Camera zoom for mouse wheel********************* GLvoid MouseWheel(int wheel, int direction, int x, int y) { const GLfloat zoomSensitive = 100.0f; //APPLY value to camera zoom sensitive. if (direction > 0) { cameraDIst -= zoomSensitive; } else { cameraDIst += zoomSensitive; } return; } **********************************************************/ GLvoid establisheProjectionMatrix(GLsizei width, GLsizei height) { glViewport(0,0,width,height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); //first setting up make perspective view. //*************FOV gluPerspective((GLfloat)viewFOVY , (GLfloat)width / (GLfloat)height, 0.1f , 200.0f); } GLvoid initGL(GLsizei width , GLsizei height) { establisheProjectionMatrix(width , height); glShadeModel(GL_SMOOTH); glClearColor(0.0f , 0.0f , 0.0f, 1.0f); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT , GL_NICEST); glEnable(GL_PERSPECTIVE_CORRECTION_HINT); } GLvoid displayFPS(GLvoid) { static long lastTime = glutGet (GLUT_ELAPSED_TIME); static long loops = 0; static GLfloat fps = 0.0f; int newTime = glutGet(GLUT_ELAPSED_TIME); if (newTime - lastTime > 100) { float newFPS = (float)loops / float(newTime-lastTime)* 1000.0f; fps = (fps+ newFPS) / 2.0f; char title[80]; sprintf_s(title, "JP OpenGL VIEWER - %f" , fps); glutSetWindowTitle(title); lastTime = newTime; loops = 0; } loops++; } GLvoid drawScene(GLvoid) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); //glTranslatef(0 , 0 , -5.0f); //offset to -z 5.0 glTranslatef(0,0,cubePositionZ); glRotatef(cubeRotateX , 1 , 0 , 0); //45 degree rotation X glRotatef(cubeRotateY , 0 , 1 , 0); //45 degree rotation +Y //큐브 그리기 glBegin(GL_QUADS); //top face glColor3f(1.0f , 0.5f , 0.0f); glVertex3f( 1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f , 1.0f , 1.0f); glVertex3f( 1.0f , 1.0f , 1.0f); //bottom face glColor3f(0.0f , 1.0f , 0.0f); glVertex3f( 1.0f ,-1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f , 1.0f); glVertex3f( 1.0f ,-1.0f , 1.0f); //front face glColor3f(1.0f , 0.0f , 0.0f); glVertex3f( 1.0f , 1.0f , 1.0f); glVertex3f(-1.0f , 1.0f , 1.0f); glVertex3f(-1.0f ,-1.0f , 1.0f); glVertex3f( 1.0f ,-1.0f , 1.0f); //back face glColor3f(1.0f , 1.0f , 0.0f);//yellow glVertex3f( 1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f ,-1.0f); glVertex3f( 1.0f ,-1.0f ,-1.0f); //left face glColor3f(0.0f , 0.0f , 1.0f);//red glVertex3f(-1.0f , 1.0f , 1.0f); glVertex3f(-1.0f , 1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f ,-1.0f); glVertex3f(-1.0f ,-1.0f , 1.0f); //right face glColor3f(1.0f , 0.0f , 1.0f); glVertex3f( 1.0f , 1.0f , 1.0f); glVertex3f( 1.0f , 1.0f ,-1.0f); glVertex3f( 1.0f ,-1.0f ,-1.0f); glVertex3f( 1.0f ,-1.0f , 1.0f); glEnd(); glFlush(); glutSwapBuffers(); displayFPS(); } GLvoid timerLoop(int value) { if ( checkKeys() ) exit(0); glutPostRedisplay(); glutTimerFunc(1 , timerLoop , 0); } GLvoid keyboardCB(unsigned char key, int x , int y) { keys[key] = true; } GLvoid keyboardUpCB(unsigned char key, int x , int y) { keys[key] = false; } GLvoid keyboardSpecialCB(int key, int x , int y) { keys[key] = true; } GLvoid keyboardSpecialUpUpCB(int key, int x , int y) { keys[key] = false; } int main ( int argc , char *argv[]) { //glut init glutInit (&argc , argv); glutInitDisplayMode(GLUT_DOUBLE); int windowID = glutCreateWindow(myTitle); glutReshapeWindow(windowWidth , windowHeight); initGL(windowWidth , windowHeight); glutDisplayFunc( drawScene ); glutKeyboardFunc( keyboardCB ); glutKeyboardUpFunc( keyboardUpCB ); glutSpecialFunc( keyboardSpecialCB ); glutSpecialUpFunc( keyboardSpecialUpUpCB ); //this line is behavior after will make glCamera. // glutMouseWheelFunc( MouseWheel ); glutTimerFunc(1,timerLoop,0); glutMainLoop(); return 0; }

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