資源泄漏 opengl/win32

Question

你好，我最近開始學習 win32/opengl，我設法編寫了一個函數，可以在一個窗口中顯示一個多色立方體。 我的問題是存在資源泄漏，但我很困惑，不確定我到底忘記刪除什么。

注意我已將范圍縮小到此功能內

void display() 
{
    g.hglrc = wglCreateContext(g.hdc);
    wglMakeCurrent(g.hdc, g.hglrc);

    // make the color a white hue  
    glClearColor(1.0F, 1.0F, 1.0F, 1.0F);

    //  Clear screen and Z-buffer
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Reset transformations
    glLoadIdentity();

    // Rotate when user changes rotate_x and rotate_y
    glRotatef(rotate_x, 1.0, 0.0, 0.0);
    glRotatef(rotate_y, 0.0, 1.0, 0.0);

    //Multi-colored side - FRONT
    glBegin(GL_POLYGON);
    glColor3f(1.0, 0.0, 0.0);     glVertex3f(0.5, -0.5, -0.5);      // P1 is red
    glColor3f(0.0, 1.0, 0.0);     glVertex3f(0.5, 0.5, -0.5);      // P2 is green
    glColor3f(0.0, 0.0, 1.0);     glVertex3f(-0.5, 0.5, -0.5);      // P3 is blue
    glColor3f(1.0, 0.0, 1.0);     glVertex3f(-0.5, -0.5, -0.5);      // P4 is purple
    glEnd();

    // White side - BACK
    glBegin(GL_POLYGON);
    glColor3f(1.0, 1.0, 1.0);
    glVertex3f(0.5, -0.5, 0.5);
    glVertex3f(0.5, 0.5, 0.5);
    glVertex3f(-0.5, 0.5, 0.5);
    glVertex3f(-0.5, -0.5, 0.5);
    glEnd();

    // Purple side - RIGHT
    glBegin(GL_POLYGON);
    glColor3f(1.0, 0.0, 1.0);
    glVertex3f(0.5, -0.5, -0.5);
    glVertex3f(0.5, 0.5, -0.5);
    glVertex3f(0.5, 0.5, 0.5);
    glVertex3f(0.5, -0.5, 0.5);
    glEnd();

    // Green side - LEFT
    glBegin(GL_POLYGON);
    glColor3f(0.0, 1.0, 0.0);
    glVertex3f(-0.5, -0.5, 0.5);
    glVertex3f(-0.5, 0.5, 0.5);
    glVertex3f(-0.5, 0.5, -0.5);
    glVertex3f(-0.5, -0.5, -0.5);
    glEnd();

    // Blue side - TOP
    glBegin(GL_POLYGON);
    glColor3f(0.0, 0.0, 1.0);
    glVertex3f(0.5, 0.5, 0.5);
    glVertex3f(0.5, 0.5, -0.5);
    glVertex3f(-0.5, 0.5, -0.5);
    glVertex3f(-0.5, 0.5, 0.5);
    glEnd();

    // Red side - BOTTOM
    glBegin(GL_POLYGON);
    glColor3f(1.0, 0.0, 0.0);
    glVertex3f(0.5, -0.5, -0.5);
    glVertex3f(0.5, -0.5, 0.5);
    glVertex3f(-0.5, -0.5, 0.5);
    glVertex3f(-0.5, -0.5, -0.5);
    glEnd();

    wglMakeCurrent(NULL, NULL);

    SwapBuffers(g.hdc);
    ReleaseDC(g.hwnd, g.hdc);
    wglDeleteContext(g.hglrc);
}

Answer 1

g.hglrc = wglCreateContext(g.hdc);

不要那樣做。

不需要每次需要重繪屏幕時都創建渲染上下文。 你創建一次； 它應該只在您的窗戶消失時消失。

現在，這並不一定證明為什么創建和銷毀渲染上下文會留下資源。 但這無關緊要； 你不應該因為性能而這樣做。 渲染上下文的創建和銷毀不是一個快速的過程，也不是它的本意。