将我的 GameWindow 设置为全屏会将其拉伸至桌面分辨率

Question

将我的 GameWindow 设置为全屏会拉伸它，如何将其设置为全屏而不丢失原始 window 分辨率并使用黑条？

这是我的代码：

using System;
using System.Collections.Generic;
using System.Text;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Windowing.Common;
using OpenTK.Windowing.GraphicsLibraryFramework;
using OpenTK.Windowing.Desktop;
using System.Drawing;

namespace OnlineGame
{
    public class Game : GameWindow
    {
        public Game(GameWindowSettings gameWindowSettings, NativeWindowSettings nativeWindowSettings)
             : base(gameWindowSettings, nativeWindowSettings)
        {
            WindowState = WindowState.Fullscreen;
        }

        protected override void OnUpdateFrame(FrameEventArgs e)
        {
            if (KeyboardState.IsKeyDown(Keys.Escape))
            {
                Close();
            }

            base.OnUpdateFrame(e);

            GL.Clear(ClearBufferMask.ColorBufferBit);
            GL.ClearColor(Color.CornflowerBlue);

            this.SwapBuffers();
        }
    }
}

Answer 1

使用GL.Viewport将视口矩形设置为window的子区域。 GL.Clear 中的“复制”操作不受视口矩形的影响。因此，你还需要设置一个Scissors Test.

您需要知道 window (current_w, current_h) 的当前大小和 window (original_w, original_h)。计算当前window（current_aspect）和原始window（original_aspect）的纵横比：

double current_aspect = (double)current_w / current_h;
double original_aspect = (double)original_w / original_h;

计算子区域并设置视口和剪刀矩形：

int w = (int)(current_w * original_aspect / current_aspect);
int x = (current_w - w) / 2;
GL.Scissor(x, 0, w, this.Size.Y);
GL.Viewport(x, 0, w, this.Size.Y);

用黑色清除整个window。然后限制视口矩形并启用剪刀测试。
注意你必须在GL.Clear指令之前设置清除颜色（GL.ClearColor）。

protected override void OnUpdateFrame(FrameEventArgs e)
{
    if (KeyboardState.IsKeyDown(Keys.Escape))
    {
        Close();
    }

    base.OnUpdateFrame(e);

    int original_w = ...;
    int original_h = ...;
    int current_w = this.Size.X;
    int current_h = this.Size.Y;
    double current_aspect = (double)current_w / current_h;
    double original_aspect = (double)original_w / original_h;

    GL.Disable(EnableCap.ScissorTest);
    GL.Viewport(0, 0, current_w, current_h);
    GL.ClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    GL.Clear(ClearBufferMask.ColorBufferBit);

    GL.Enable(EnableCap.ScissorTest);
    if (current_aspect > original_aspect)
    {
        int w = (int)(current_w * original_aspect / current_aspect);
        int x = (current_w - w) / 2;
        GL.Scissor(x, 0, w, this.Size.Y);
        GL.Viewport(x, 0, w, this.Size.Y);
    }
    else
    {
        int h = (int)(current_h * current_aspect / original_aspect);
        int y = (current_h - h) / 2;
        GL.Scissor(0, y, this.Size.X, h);
        GL.Viewport(0, y, this.Size.X, h);
    }
    
    GL.ClearColor(Color.CornflowerBlue);
    GL.Clear(ClearBufferMask.ColorBufferBit);

    // [...]    

    this.SwapBuffers();
}

将我的 GameWindow 设置为全屏会将其拉伸至桌面分辨率

Setting my GameWindow to fullscreen will stretch it to the desktop resolution

c#

opengl

fullscreen

opentk