OpenGL在windows和Ubuntu下

 

感覺OpenGL開竅啦～

移動、縮放、旋轉效果

代碼如下，略有不同：

Windows：

#include "StdAfx.h" #include "windows.h" #include "GL/gl.h" #include "GL/glu.h" #include "GL/glut.h" #pragma comment( lib, "glu32.lib" ) #pragma comment( lib, "OpenGL32.lib" ) void myinit(void); void myReshape(int w,int h); void display(); static int color = 0; static float size = 1.0; //set current color according to "color" void setColor() { //Change current color switch(color){ case 0: glColor3f(1.0,1.0,0); break; case 1: glColor3f(0,1.0,1.0); break; case 2: glColor3f(1.0,0,1.0); break; default: glColor3f(1.0,1.0,1.0); } } //set current color according to next "color" void nextColor() { if (color < 2) color += 1; else color = 0; setColor(); } void init(void) { glClearColor(0.0, 0.0 ,0.0, 0.0); glClear(GL_COLOR_BUFFER_BIT); } void display() { init(); //show coordinate lines glColor3f(1.0,1.0,1.0); glBegin(GL_LINES); //x glColor3f(1.0f,0,0); glVertex3f(0.9f,0,0); glVertex3f(-0.9f,0,0); //y glColor3f(0,1.0f,0); glVertex3f(0,0.9f,0); glVertex3f(0,-0.9f,0); //z glColor3f(0,0,1.0f); glVertex3f(0,0,0.9f); glVertex3f(0,0,-0.9f); glEnd(); //show image setColor(); glutWireCube(size); glFlush(); } //Call when resize void reshape(int w,int h) { glViewport(0,0,w,h); } //Use Space to change color void CALLBACK changeColor() { nextColor(); display(); } //Use Right to move right void CALLBACK moveRight() { glTranslatef(0.05f, 0.0, 0.0); display(); } //Use Left to move left void CALLBACK moveLeft() { glTranslatef(-0.05f, 0.0, 0.0); display(); } //Use Up to move up void CALLBACK moveUp() { glTranslatef(0.0, 0.05f, 0.0); display(); } //Use Down to move down void CALLBACK moveDown() { glTranslatef(0.0, -0.05f, 0.0); display(); } //Use s to make bigger void CALLBACK bigger() { size /= 0.9f; display(); } //Use a to make smaller void CALLBACK smaller() { size *= 0.9f; display(); } //Use q to rotate by x void CALLBACK rotateX() { glRotatef(5.0, 1.0, 0, 0); display(); } //Use w to rotate by y void CALLBACK rotateY() { glRotatef(5.0, 0, 1.0, 0); display(); } //Use e to rotate by z void CALLBACK rotateZ() { glRotatef(5.0, 0, 0, 1.0); display(); } void keyboard(unsigned char key, int x, int y) { switch (key) { case 27: // ESCAPE key exit (0); break; case 's': bigger(); break; case 'a': smaller(); break; case 'q': rotateX(); break; case 'w': rotateY(); break; case 'e': rotateZ(); break; case ' ': changeColor(); break; case 'j': moveLeft(); break; case 'k': moveDown(); break; case 'l': moveRight(); break; } } void special(int key, int x, int y) { switch (key) { case GLUT_KEY_LEFT: moveLeft(); break; case GLUT_KEY_RIGHT: moveRight(); break; case GLUT_KEY_UP: moveUp(); break; case GLUT_KEY_DOWN: moveDown(); break; } } void main(int argc, char** argv) { //Init a window glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100); glutCreateWindow("Test"); //clear window and set init color setColor(); //listener of keyboard glutKeyboardFunc(keyboard); glutSpecialFunc(special); init(); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); } 

Linux：

#include "GL/gl.h" #include "GL/glu.h" #include "GL/glut.h" #include <iostream> using namespace std; void myinit(void); void myReshape(int w,int h); void display(); static int color = 0; static float size = 1.0; //set current color according to "color" void setColor() { //Change current color switch(color){ case 0: glColor3f(1.0,1.0,0); break; case 1: glColor3f(0,1.0,1.0); break; case 2: glColor3f(1.0,0,1.0); break; default: glColor3f(1.0,1.0,1.0); } } //set current color according to next "color" void nextColor() { if (color < 2) color += 1; else color = 0; setColor(); } void init(void) { glClearColor(0.0, 0.0 ,0.0, 0.0); glClear(GL_COLOR_BUFFER_BIT); } void display() { init(); //show coordinate lines glColor3f(1.0,1.0,1.0); glBegin(GL_LINES); //x glColor3f(1.0f,0,0); glVertex3f(0.9f,0,0); glVertex3f(-0.9f,0,0); //y glColor3f(0,1.0f,0); glVertex3f(0,0.9f,0); glVertex3f(0,-0.9f,0); //z glColor3f(0,0,1.0f); glVertex3f(0,0,0.9f); glVertex3f(0,0,-0.9f); glEnd(); //show image setColor(); glutWireCube(size); glFlush(); } //Call when resize void reshape(int w,int h) { glViewport(0,0,w,h); } //Use Space to change color void changeColor() { nextColor(); display(); } //Use Right to move right void moveRight() { glTranslatef(0.05f, 0.0, 0.0); display(); } //Use Left to move left void moveLeft() { glTranslatef(-0.05f, 0.0, 0.0); display(); } //Use Up to move up void moveUp() { glTranslatef(0.0, 0.05f, 0.0); display(); } //Use Down to move down void moveDown() { glTranslatef(0.0, -0.05f, 0.0); display(); } //Use s to make bigger void bigger() { size /= 0.9f; display(); } //Use a to make smaller void smaller() { size *= 0.9f; display(); } //Use q to rotate by x void rotateX() { glRotatef(5.0, 1.0, 0, 0); display(); } //Use w to rotate by y void rotateY() { glRotatef(5.0, 0, 1.0, 0); display(); } //Use e to rotate by z void rotateZ() { glRotatef(5.0, 0, 0, 1.0); display(); } void keyboard(unsigned char key, int x, int y) { switch (key) { case 27: // ESCAPE key exit (0); break; case 's': bigger(); break; case 'a': smaller(); break; case 'q': rotateX(); break; case 'w': rotateY(); break; case 'e': rotateZ(); break; case ' ': changeColor(); break; case 'j': moveLeft(); break; case 'k': moveDown(); break; case 'l': moveRight(); break; case 'i': moveUp(); break; } } void special(int key, int x, int y) { switch (key) { case GLUT_KEY_LEFT: moveLeft(); break; case GLUT_KEY_RIGHT: moveRight(); break; case GLUT_KEY_UP: moveUp(); break; case GLUT_KEY_DOWN: moveDown(); break; } } int main(int argc, char** argv) { //Init a window glutInit(&argc, argv); glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize (600, 600); glutInitWindowPosition (100, 100); glutCreateWindow("Test"); //clear window and set init color setColor(); //listener of keyboard glutKeyboardFunc(keyboard); glutSpecialFunc(special); init(); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); return 0; } 

編譯：

$ g++ -IGL -lglut test2.cpp -o test.exe

就生成了test.exe

$  ./test.exe

顯示：

OpenGL Warning: XGetVisualInfo returned 0 visuals for 0xa082b78

OpenGL Warning: Retry with 0x8002 returned 0 visuals

Segmentation fault

網上搜了一下，得到解決方案

$ LIBGL_ALWAYS_INDIRECT=1 ./test.exe

運行結果：

按qwe進行xyz軸旋轉，as放大縮小，上下左右移動，space換色，得到以下效果——

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