VBO.rar_glew_opengl vbo_vbo

#define GLUT_DISABLE_ATEXIT_HACK #include <iostream> #include <gl/glew.h> //#define GLUT_DISABLE_ATEXIT_HACK #include <gl/GLUT.H> #pragma comment(lib, "glew32.lib") using namespace std; // cube /////////////////////////////////////////////////////////////////////// // v6----- v5 // /| /| // v1------v0| // | | | | // | |v7---|-|v4 // |/ |/ // v2------v3 // vertex coords array for glDrawArrays() ===================================== // A cube has 6 sides and each side has 2 triangles, therefore, a cube consists // of 36 vertices (6 sides * 2 tris * 3 vertices = 36 vertices). And, each // vertex is 3 components (x,y,z) of floats, therefore, the size of vertex // array is 108 floats (36 * 3 = 108). GLfloat vertices[] = { 1, 1, 1, -1, 1, 1, -1,-1, 1, // v0-v1-v2 (front) -1,-1, 1, 1,-1, 1, 1, 1, 1, // v2-v3-v0 1, 1, 1, 1,-1, 1, 1,-1,-1, // v0-v3-v4 (right) 1,-1,-1, 1, 1,-1, 1, 1, 1, // v4-v5-v0 1, 1, 1, 1, 1,-1, -1, 1,-1, // v0-v5-v6 (top) -1, 1,-1, -1, 1, 1, 1, 1, 1, // v6-v1-v0 -1, 1, 1, -1, 1,-1, -1,-1,-1, // v1-v6-v7 (left) -1,-1,-1, -1,-1, 1, -1, 1, 1, // v7-v2-v1 -1,-1,-1, 1,-1,-1, 1,-1, 1, // v7-v4-v3 (bottom) 1,-1, 1, -1,-1, 1, -1,-1,-1, // v3-v2-v7 1,-1,-1, -1,-1,-1, -1, 1,-1, // v4-v7-v6 (back) -1, 1,-1, 1, 1,-1, 1,-1,-1 }; // v6-v5-v4 // normal array GLfloat normals[] = { 0, 0, 1, 0, 0, 1, 0, 0, 1, // v0-v1-v2 (front) 0, 0, 1, 0, 0, 1, 0, 0, 1, // v2-v3-v0 1, 0, 0, 1, 0, 0, 1, 0, 0, // v0-v3-v4 (right) 1, 0, 0, 1, 0, 0, 1, 0, 0, // v4-v5-v0 0, 1, 0, 0, 1, 0, 0, 1, 0, // v0-v5-v6 (top) 0, 1, 0, 0, 1, 0, 0, 1, 0, // v6-v1-v0 -1, 0, 0, -1, 0, 0, -1, 0, 0, // v1-v6-v7 (left) -1, 0, 0, -1, 0, 0, -1, 0, 0, // v7-v2-v1 0,-1, 0, 0,-1, 0, 0,-1, 0, // v7-v4-v3 (bottom) 0,-1, 0, 0,-1, 0, 0,-1, 0, // v3-v2-v7 0, 0,-1, 0, 0,-1, 0, 0,-1, // v4-v7-v6 (back) 0, 0,-1, 0, 0,-1, 0, 0,-1 }; // v6-v5-v4 // color array GLfloat colors[] = { 1, 1, 1, 1, 1, 0, 1, 0, 0, // v0-v1-v2 (front) 1, 0, 0, 1, 0, 1, 1, 1, 1, // v2-v3-v0 1, 1, 1, 1, 0, 1, 0, 0, 1, // v0-v3-v4 (right) 0, 0, 1, 0, 1, 1, 1, 1, 1, // v4-v5-v0 1, 1, 1, 0, 1, 1, 0, 1, 0, // v0-v5-v6 (top) 0, 1, 0, 1, 1, 0, 1, 1, 1, // v6-v1-v0 1, 1, 0, 0, 1, 0, 0, 0, 0, // v1-v6-v7 (left) 0, 0, 0, 1, 0, 0, 1, 1, 0, // v7-v2-v1 0, 0, 0, 0, 0, 1, 1, 0, 1, // v7-v4-v3 (bottom) 1, 0, 1, 1, 0, 0, 0, 0, 0, // v3-v2-v7 0, 0, 1, 0, 0, 0, 0, 1, 0, // v4-v7-v6 (back) 0, 1, 0, 0, 1, 1, 0, 0, 1 }; // v6-v5-v4 GLuint vboId = 0; //camera float cameraAngleX; float cameraAngleY; float cameraDistance = -5.0; //mouse bool mouseLeftDown; bool mouseRightDown; float LastXPos; float LastYPos; void initGL() { glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_SMOOTH); glGenBuffers(1, &vboId); glBindBuffer(GL_ARRAY_BUFFER, vboId); glBufferData(GL_ARRAY_BUFFER, sizeof(vertices)+sizeof(normals)+sizeof(colors), 0, GL_STATIC_DRAW); glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices); //第二个数据是偏移 glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertices), sizeof(normals), normals); glBufferSubData(GL_ARRAY_BUFFER, sizeof(vertices)+sizeof(normals), sizeof(colors), colors); } void display() { glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glLoadIdentity(); glTranslatef(0, 0, cameraDistance); glRotatef(cameraAngleX, 1, 0, 0); glRotatef(cameraAngleY, 0, 1, 0); glBindBuffer(GL_ARRAY_BUFFER, vboId); glEnableClientState(GL_NORMAL_ARRAY); glEnableClientState(GL_COLOR_ARRAY); glEnableClientState(GL_VERTEX_ARRAY); glNormalPointer(GL_FLOAT, 0, (void*)sizeof(vertices)); //最后一个值为偏移 glColorPointer(3, GL_FLOAT, 0, (void*)(sizeof(vertices)+sizeof(normals))); glVertexPointer(3, GL_FLOAT, 0, 0); glDrawArrays(GL_TRIANGLES, 0, 36);//从0开始 glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_COLOR_ARRAY); glDisableClientState(GL_NORMAL_ARRAY); glBindBuffer(GL_ARRAY_BUFFER, 0); glPopMatrix(); glutSwapBuffers(); } void reshape(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60.0f, (GLfloat)w/(GLfloat)h, 0.01f, 100.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void mouse(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) { mouseLeftDown = true; LastXPos = x; LastYPos = y; } /*if (button == GLUT_RIGHT_BUTTON && state == GLUT_UP) { mouseRightDown = true; }*/ } void mouseMotion(int x, int y) { if (mouseLeftDown) { cameraAngleX += GLfloat(y - LastYPos)/GLfloat(20.0); cameraAngleY += GLfloat(x - LastXPos)/GLfloat(20.0); LastYPos = y; LastXPos = x; } } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA); glutInitWindowSize(480, 640); glutInitWindowPosition(100, 100); glutCreateWindow("VBO"); glewInit(); if(!glewIsSupported("GL_VERSION_2_0")) { fprintf(stderr, "ERROR: Support for necessary OpengGL extensions missing."); } initGL(); glutDisplayFunc(display); glutIdleFunc(display); glutReshapeFunc(reshape); glutMouseFunc(mouse); glutMotionFunc(mouseMotion); glutMainLoop(); glDeleteBuffers(GL_ARRAY_BUFFER, &vboId); return 0; }