OpenTk 纹理不显示图像

本文关键字：显示图 图像 显示 纹理 OpenTk | 更新日期: 2023-09-27 18:33:45

OpenTk 纹理不显示图像

它只显示一个白色三角形，但没有显示我尝试加载的图像。

这是我的代码：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Input;
namespace StarterKit{
class Game : GameWindow
{
    uint Texture;

    public Game()
        : base(800, 600, GraphicsMode.Default, "OpenTK Quick Start Sample")
    {
        VSync = VSyncMode.On;
    }
    static int LoadTexture(string filename)
    {
        if (String.IsNullOrEmpty(filename))
            throw new ArgumentException(filename);
        int id = GL.GenTexture();
        GL.BindTexture(TextureTarget.Texture2D, id);
        Bitmap bmp = new Bitmap(filename);
        BitmapData bmp_data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
        GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, bmp_data.Width, bmp_data.Height, 0,
            OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, bmp_data.Scan0);
        bmp.UnlockBits(bmp_data);

        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
        return id;
    }
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        GL.ClearColor(0.1f, 0.2f, 0.5f, 0.0f);
        GL.Enable(EnableCap.DepthTest);
        GL.Enable(EnableCap.Texture2D);

        Texture = (uint)LoadTexture("unknown.png");
        return;
    }

    protected override void OnResize(EventArgs e)
    {
        base.OnResize(e);
        GL.Viewport(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height);
        Matrix4 projection = Matrix4.CreatePerspectiveFieldOfView((float)Math.PI / 4, Width / (float)Height, 1.0f, 64.0f);
        GL.MatrixMode(MatrixMode.Projection);
        GL.LoadMatrix(ref projection);
    }

    protected override void OnUpdateFrame(FrameEventArgs e)
    {
        base.OnUpdateFrame(e);
        if (Keyboard[Key.Escape])
            Exit();
    }

    protected override void OnRenderFrame(FrameEventArgs e)
    {
        base.OnRenderFrame(e);
        GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
        Matrix4 modelview = Matrix4.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);
        GL.MatrixMode(MatrixMode.Modelview);
        GL.LoadMatrix(ref modelview);
        GL.Begin(BeginMode.Triangles);
        GL.TexCoord2(0, 0);
        GL.Vertex3(-1.0f, -1.0f, 4.0f);
        GL.TexCoord2(1, 0);
        GL.Vertex3(1.0f, -1.0f, 4.0f);
        GL.TexCoord2(0.5, 1);
        GL.Vertex3(0.0f, 1.0f, 4.0f);
        GL.End();
        SwapBuffers();
    }

    [STAThread]
    static void Main()
    {
        using (Game game = new Game())
        {
            game.Run(30.0);
        }
    }
}
}

没有任何错误或警告。我只是不知道缺少什么。

OpenTk 纹理不显示图像

你似乎根本没有绑定你的纹理。

你

从磁盘加载它，并将其发送到openGL，然后你得到一个ID，但你没有告诉opengl你想使用纹理。

试试这个：

//"Texture" is the uint you got back from openTK when you loaded the texture
GL.Begin(BeginMode.Triangles);
GL.BindTexture(TextureTarget.Texture2D, Texture);
GL.TexCoord2(0, 0);
GL.Vertex3(-1.0f, -1.0f, 4.0f);
GL.TexCoord2(1, 0);
GL.Vertex3(1.0f, -1.0f, 4.0f);
GL.TexCoord2(0.5, 1);
GL.Vertex3(0.0f, 1.0f, 4.0f);
GL.End();
SwapBuffers();
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