Question

我想创建一个覆盖整个桌面屏幕的窗口，显示颜色RGB然后显示VIBGYOR。颜色延迟应为1秒。这是我编写的代码，但输出不符合预期。谁能告诉我哪里错了？

#include<GL/freeglut.h>
#include<GL/glut.h>
#include<stdio.h>

void main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );

    glutInitWindowSize(1280,1024);
    glutCreateWindow("Displays");
    glutFullScreen();   

    glClearColor (1.0, 0.0, 0.0, 0.0);      //Red
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(0,1,0,0);              //Green
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(0,0,1,0);
    glClear(GL_COLOR_BUFFER_BIT);           //Blue
    sleep(1);   

    glClearColor(0.933, 0.510, 0.933, 0.0);     //violet
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(0.294, 0.000, 0.510, 1);       //Indigo
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(0,0,1,1);              //Blue
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(0,0.502,0,1);          //Green
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(1,1,0,1);              //Yellow
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(1,0.647,0,1);          //Orange
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

    glClearColor(1,0,0,1);              //Red
    glClear(GL_COLOR_BUFFER_BIT);
    sleep(1);   

glutMainLoop();
}

感谢。

Answer 1

您正在使用GLUT_DOUBLE（double buffering）初始化显示模式，每当您使用缓冲区并希望添加gluSwapBuffers()时，您需要添加... glClearColor(1,0,0,1); //Red glClear(GL_COLOR_BUFFER_BIT); glutSwapBuffers(); sleep(1); ...显示它。

    for (int index = 0; index < words.Count; index++)
    {
        var word = words[index];
        //doStuff
    }

Difference between single buffered(GLUT_SINGLE) and double buffered drawing(GLUT_DOUBLE)

使用GL_SINGLE时，您可以直接将代码绘制到显示屏上。

使用GL_DOUBLE时，您可以想象有两个缓冲区。其中一个总是可见的，另一个不是

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1 个答案: