Tag Archives: platform

Configure glut in Ubuntu and implement basic OpenGL experiment on CodeBlocks platform

1. First, install GLUT. I selected “Download FreeGLUT” to install the command procedure:
http://freeglut.sourceforge.net/docs/install.php
$sudo apt-get install libxi-dev: error: X11/extensions/ xinput. h: No such file or directory
//after the installation, my computer inside the/usr/local/include/lib folder and set up some reference libraries and header files, etc

2. Configure Codeblocks:
Open Codeblocks, select the GLUT project, select New, enter the project name, and you will be prompted to specify the installation path for GLUT. You can specify it directly to /usr/ (I specified /usr/local/). If both of the above files are present, you should be able to set up the project without any problems.
in the end, one more thing, is to compile time there will be a mistake about Xxf86vm. Right-click on the project to open the project properties window and see the “Project Settings” TAB. Click on the “project ‘s build
Options “, then click on the “Linker Settings” TAB and delete the reference to xxf86VM to compile correctly.
3. Another easy way (just use Vim directly)
1). Install build-essential sudo apt-get Install build-essential // Install autotool
2). Install OpenGL sudo apt-get Install FreeGLUT 3-dev //
3). Use the command: : GCC simple.c-lGlut-o Simple at compile time
Where simple.c can use:

/*
 * GLUT Shapes Demo
 *
 * Written by Nigel Stewart November 2003
 *
 * This program is test harness for the sphere, cone
 * and torus shapes in GLUT.
 *
 * Spinning wireframe and smooth shaded shapes are
 * displayed until the ESC or q key is pressed.  The
 * number of geometry stacks and slices can be adjusted
 * using the + and - keys.
 */

#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <stdlib.h>

static int slices = 16;
static int stacks = 16;

/* GLUT callback Handlers */

static void resize(int width, int height)
{
    const float ar = (float) width/(float) height;

    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity() ;
}

static void display(void)
{
    const double t = glutGet(GLUT_ELAPSED_TIME)/1000.0;
    const double a = t*90.0;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3d(1,0,0);

    glPushMatrix();
        glTranslated(-2.4,1.2,-6);
        glRotated(60,1,0,0);
        glRotated(a,0,0,1);
        glutSolidSphere(1,slices,stacks);
    glPopMatrix();

    glPushMatrix();
        glTranslated(0,1.2,-6);
        glRotated(60,1,0,0);
        glRotated(a,0,0,1);
        glutSolidCone(1,1,slices,stacks);
    glPopMatrix();

    glPushMatrix();
        glTranslated(2.4,1.2,-6);
        glRotated(60,1,0,0);
        glRotated(a,0,0,1);
        glutSolidTorus(0.2,0.8,slices,stacks);
    glPopMatrix();

    glPushMatrix();
        glTranslated(-2.4,-1.2,-6);
        glRotated(60,1,0,0);
        glRotated(a,0,0,1);
        glutWireSphere(1,slices,stacks);
    glPopMatrix();

    glPushMatrix();
        glTranslated(0,-1.2,-6);
        glRotated(60,1,0,0);
        glRotated(a,0,0,1);
        glutWireCone(1,1,slices,stacks);
    glPopMatrix();

    glPushMatrix();
        glTranslated(2.4,-1.2,-6);
        glRotated(60,1,0,0);
        glRotated(a,0,0,1);
        glutWireTorus(0.2,0.8,slices,stacks);
    glPopMatrix();

    glutSwapBuffers();
}


static void key(unsigned char key, int x, int y)
{
    switch (key)
    {
        case 27 :
        case 'q':
            exit(0);
            break;

        case '+':
            slices++;
            stacks++;
            break;

        case '-':
            if (slices>3 && stacks>3)
            {
                slices--;
                stacks--;
            }
            break;
    }

    glutPostRedisplay();
}

static void idle(void)
{
    glutPostRedisplay();
}

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };

/* Program entry point */

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitWindowSize(640,480);
    glutInitWindowPosition(10,10);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutReshapeFunc(resize);
    glutDisplayFunc(display);
    glutKeyboardFunc(key);
    glutIdleFunc(idle);

    glClearColor(1,1,1,1);
    glEnable(GL_CULL_FACE);
    glCullFace(GL_BACK);

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();

    return EXIT_SUCCESS;
}

To complete.

How to use high version OpenGL under Windows

Windows only supports OpenGL1.1, but graphics cards may implement the related functions of higher versions of OpenGL directly from the hardware. How do you call a higher version of OpenGL in development?
 
Let’s start with a look at the OpenGL version and related function extensions supported by a graphics card:
To see what version of OpenGL the graphics card supports: glGetString(GL_VERSION);
To see the supported extensions: glGetString(GL_EXTENSIONS);
See more detailed information.
http://www.opengl.org/wiki/GlGetString
Note: call glGetString(GLemun); Be sure to initialize the drawing window before doing so, otherwise only null will be returned.
 
Calling extensions with glew:
After confirm the graphics support high version of the function can be used to glew libraries (http://sourceforge.net/projects/glew/) to invoke, configured information can be used after glew libraries. What I want to point out here is that before using the OpenGL function declared in the advanced version of Glew, you must make the following call:
GLenum err = glewInit ();
if (GLEW_OK! = err)
{
* Problem: glewInit failed, something is seriously wrong. */
f>tf (stderr, “Error: %s/n”, glewgeterrorString (err));
}
 
 
You can also use glee,glext, and mesa.
Glee is similar to Glew,glext is a bit cumbersome to use, and mesa is a platform-independent implementation of OpenGL.

Http Error 12057 (Bug Fix Note)

A Bug has been reported in the product that only occurs for a specific platform, Windows Server 2003 Standard Edition.
Check the Trace Log and find that the wrapper class of Wininet call returns Error 12057, with the specific Error contents as follows:

ERROR_WINHTTP_SECURE_CERT_REV_FAILED

12057

Indicates that revocation cannot be checked because the revocation server was offline (equivalent to CRYPT_E_REVOCATION_OFFLINE).
Open the
IE-> Tools-> Internet Options-> Advanced Tab-> Security Options – & gt;” Check for server certificate revocation(Requires Restart) “

This option is currently selected. Remove this option and the Bug symptoms disappear. Only IE with Windows Server 2003 Standard Edition is checked by default, and Error 12057 (Microsoft’s Bug?) does not occur when this option is checked on other platforms. or with other options?) . Decided to code the problem.
The code to solve this problem is quite simple. Add the following code after HttpOpenRequest to set the current Http connection options to cancel this check
DWORD dwFlags = 0;

DWORD dwError = 0;

DWORD dwBuffLen = sizeof(dwFlags);
InternetQueryOption(m_hRequest, INTERNET_OPTION_SECURITY_FLAGS,

(LPVOID)& dwFlags, & dwBuffLen);

dwFlags |= SECURITY_FLAG_IGNORE_REVOCATION;

InternetSetOption(m_hRequest, INTERNET_OPTION_SECURITY_FLAGS, (LPVOID)& dwFlags, sizeof(dwFlags)) ;