问题GLUT [英] Problem with GLUT

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本文介绍了问题GLUT的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

当我尝试编译后运行该code,我只拿到了没有内容的窗口边框,所以在哪里错误?

注:我使用Ubuntu和gcc编译

  GCC -lglut Simple.c -o简单

输出

 的#include< GL / glut.h> //头文件过剩图书馆
#包括LT&; GL / gl.h> //头文件OpenGL库
#包括LT&; GL / glu.h> //头文件的GLU库无效SetupRC(无效);
无效RenderScene(无效);
无效ChangeSize(GLsizei W,GLsizei H);//调用来绘制场景
无效RenderScene(无效)
{
    //清除当前结算颜色窗口
    glClear(GL_COLOR_BUFFER_BIT);    //设置颜色为这些值
    // R G B
    glColor3f(56.0f,19.0f,68.0f);    //绘制与当前颜色填充矩形
    glRectf(-25.0f,50.0f,50.0f,-25.0f);    //嵌入式绘图命令
    glFlush();
}INT主(INT ARGC,CHAR *的argv [])
{
    glutInit(安培; ARGC,ARGV);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_SINGLE | GLUT_RGBA);
    glutInitWindowPosition(400,200);
    glutInitWindowSize(640468);
    glutCreateWindow(简单);
    glutDisplayFunc(RenderScene);
    glutReshapeFunc(ChangeSize);    SetupRC();
    glutMainLoop();    返回0;
}//设置渲染状态
无效SetupRC(无效)
{
    glClearColor(0.0,2.0F,1.0F,0.0);
}//处理窗口大小调整
无效ChangeSize(GLsizei W,GLsizei高)
{
    GLfloat的aspectRatio;    // $ P零$ pvent鸿沟
    如果(H == 0)
        H = 1;    //设置视口窗口尺寸
    glViewport(0,0,W,H);    //重置坐标系
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();    //建立裁剪量(左,右,底,顶,近,远)
    的aspectRatio =(GLfloat)W /(GLfloat)H;
    如果(W&所述= H){
        glOrtho(-100.0,100.0,-100 /的aspectRatio,100.0 /的aspectRatio,1.0,-1.0);
    }
    其他
        glOrtho(-100.0 *的aspectRatio,100.0 *的aspectRatio,-100.0,100.0,1.0,-1.0);    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}


解决方案

尝试添加 glutSwapBuffers()年底RenderScene()

When i try to run this code after compiling it, i got only a window border without content, so where is the error?

Note: i am using ubuntu and gcc for compiling

gcc -lglut  Simple.c -o Simple

The output

#include <GL/glut.h> // Header File For The GLUT Library 
#include <GL/gl.h> // Header File For The OpenGL Library 
#include <GL/glu.h> // Header File For The GLu Library

void SetupRC(void);
void RenderScene(void);
void ChangeSize(GLsizei w, GLsizei h);

// Called to draw scene
void RenderScene(void)
{
    // Clear the window with current clearing color
    glClear(GL_COLOR_BUFFER_BIT);

    // set the color to these values
    //          R    G     B
    glColor3f(56.0f, 19.0f,68.0f);

    // Draw a filled rectangle with current color
    glRectf(-25.0f, 50.0f, 50.0f, -25.0f);

    // Flush drawing commands
    glFlush();
}

int main(int argc, char* argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_SINGLE | GLUT_RGBA);
    glutInitWindowPosition(400,200);
    glutInitWindowSize(640,468);
    glutCreateWindow("Simple");
    glutDisplayFunc(RenderScene);
    glutReshapeFunc(ChangeSize);

    SetupRC();
    glutMainLoop();

    return 0;
}

// Setup the rendering state
void SetupRC(void)
{
    glClearColor(0.0f, 2.0f, 1.0f, 0.0f);
}

// Handling window resizing
void ChangeSize(GLsizei w, GLsizei h)
{
    GLfloat aspectRatio;

    // Prevent divide by zero
    if (h == 0) 
        h = 1;

    // Set Viewport to window dimensions
    glViewport(0, 0, w, h);

    // Reset coordinate system
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    // Establish clipping volume (left, right, bottom, top, near, far)
    aspectRatio = (GLfloat) w / (GLfloat) h;
    if (w <= h) {
        glOrtho(-100.0, 100.0, -100 / aspectRatio, 100.0 / aspectRatio, 1.0, -1.0);
    }
    else
        glOrtho(-100.0 * aspectRatio, 100.0 * aspectRatio, -100.0, 100.0, 1.0, -1.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

解决方案

Try adding a glutSwapBuffers() to the end of RenderScene().

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