Freeglut ew glutIdleFunc導致滯后

Question

我剛開始使用freeglut和glew，讓它運行對我來說已經很困難。 因此，現在我開始使用敏捷的教程進行編碼，並且顯示了一個正方形，效果很好。 現在，我要用箭頭鍵使正方形移動。

從我插入glutIdleFunc的那一點開始，它開始滯后。 我無法移動窗口或單擊其他任何按鈕約一分鍾。 如果我嘗試拖動窗口，則它將在大約2分鍾后移動。

我嘗試使用以下代碼執行此操作：

#include <GL/glew.h> 
#include <GL/glut.h>

bool* keyStates = new bool[256]; 
float positionX = 0;
void renderPrimitive (void) 
{
    glBegin(GL_QUADS);
    glVertex3f(-1.0f, -1.0f, 0.0f); // The bottom left corner
    glVertex3f(-1.0f, 1.0f, 0.0f); // The top left corner
    glVertex3f(1.0f, 1.0f, 0.0f); // The top right corner
    glVertex3f(1.0f, -1.0f, 0.0f); // The bottom right corner
    glEnd();
}
void keySpecial (int key, int x, int y) 
{
    if (keyStates[GLUT_KEY_RIGHT]) 
    {   
        positionX++;
    }
}

void display (void) 
{

    glClearColor(1.0f, 0.0f, 0.0f, 1.0f); // Clear the background of our window to red
    glClear(GL_COLOR_BUFFER_BIT); //Clear the colour buffer (more buffers later on)
    glLoadIdentity(); // Load the Identity Matrix to reset our drawing locations
    glTranslatef(0.0f, 0.0f, -5.0f);
    renderPrimitive();
    glFlush(); // Flush the OpenGL buffers to the window
}

void reshape (int width, int height)
{
    glViewport(0, 0, (GLsizei)width, (GLsizei)height); // Set our viewport to the size of our window
    glMatrixMode(GL_PROJECTION); // Switch to the projection matrix so that we can manipulate how our scene is viewed
    glLoadIdentity(); // Reset the projection matrix to the identity matrix so that we don't get any artifacts (cleaning up)
    gluPerspective(60, (GLfloat)width / (GLfloat)height, 1.0, 100.0); // Set the Field of view angle (in degrees), the aspect ratio of our window, and the new and far planes
    glMatrixMode(GL_MODELVIEW); // Switch back to the model view matrix, so that we can start drawing shapes correctly
}

void keyPressed (unsigned char key, int x, int y) 
{
    keyStates[key] = true; // Set the state of the current key to pressed
}

void keyUp (unsigned char key, int x, int y)
{
    keyStates[key] = false; // Set the state of the current key to not pressed
}

int main (int argc, char **argv) 
{
    glutInit(&argc, argv); // Initialize GLUT
    glutInitDisplayMode (GLUT_SINGLE); // Set up a basic display buffer (only single buffered for now)
    glutInitWindowSize (500, 500); // Set the width and height of the window
    glutInitWindowPosition (100, 100); // Set the position of the window
    glutCreateWindow ("Your first OpenGL Window"); // Set the title for the window

    glutDisplayFunc(display); // Tell GLUT to use the method "display" for rendering

    glutReshapeFunc(reshape); // Tell GLUT to use the method "reshape" for reshaping
    glutIdleFunc(display);
    glutKeyboardFunc(keyPressed); // Tell GLUT to use the method "keyPressed" for key presses
    glutKeyboardUpFunc(keyUp); // Tell GLUT to use the method "keyUp" for key up events
    glutSpecialFunc(keySpecial);
    glutMainLoop(); // Enter GLUT's main loop
}

我不認為這是硬件問題，因為我的計算機可以玩大型游戲。

Answer 1

您應該避免在閑置功能中進行任何總帳繪圖。 如果要連續重繪場景，請使用空閑功能，例如

void idle(void)
{
    glutPostRedisplay();
}

看看是否有幫助。