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编辑：好的，这段代码仍然不允许我在程序中使用两种不同的纹理。它看起来应该可以工作，但是当我告诉它使用第一个纹理时，它与第二个纹理相同，这是加载的最后一个纹理。

        private int[] iTextures = new int[3];

        public void main()
        {
            Initialize();
            LoadContent();

            float Time = 0.0F;

            // Start game loop
            while (App.IsOpened())
            {
                // Process events
                App.DispatchEvents();

                // Clear the window
                App.Clear();

                App.Draw(Background);

                Gl.glClear(Gl.GL_DEPTH_BUFFER_BIT);

                // Transformations
                Time += App.GetFrameTime();
                Gl.glMatrixMode(Gl.GL_MODELVIEW);
                Gl.glLoadIdentity();
                Gl.glTranslatef(0.0F, 0.0F, -200.0F);


                Gl.glPushMatrix();

                Gl.glScalef(10.0f, 50.0f, 10.0f);
                DrawCube(50.0f, 50.0f, 50.0f, 0);

                Gl.glPopMatrix();

                //Gl.glRotatef(Time * 50, 1.0F, 0.0F, 0.0F);
                //Gl.glRotatef(Time * 30, 0.0F, 1.0F, 0.0F);
                //Gl.glRotatef(Time * 90, 0.0F, 0.0F, 1.0F);


                /*Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-50.0F, -50.0F, -50.0F);
                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(-50.0F, 50.0F, -50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(50.0F, 50.0F, -50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(50.0F, -50.0F, -50.0F);

                Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-50.0F, -50.0F, 50.0F);
                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(-50.0F, 50.0F, 50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(50.0F, 50.0F, 50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(50.0F, -50.0F, 50.0F);

                Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-50.0F, -50.0F, -50.0F);
                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(-50.0F, 50.0F, -50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(-50.0F, 50.0F, 50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(-50.0F, -50.0F, 50.0F);

                Gl.glTexCoord2f(0, 0); Gl.glVertex3f(50.0F, -50.0F, -50.0F);
                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(50.0F, 50.0F, -50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(50.0F, 50.0F, 50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(50.0F, -50.0F, 50.0F);

                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(-50.0F, -50.0F, 50.0F);
                Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-50.0F, -50.0F, -50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(50.0F, -50.0F, -50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(50.0F, -50.0F, 50.0F);

                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(-50.0F, 50.0F, 50.0F);
                Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-50.0F, 50.0F, -50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(50.0F, 50.0F, -50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(50.0F, 50.0F, 50.0F);


                Gl.glVertex3f(50.0f, 50.0f, 50.0f);
                Gl.glVertex3f(50.0f, 0.0f, 50.0f);
                Gl.glVertex3f(0.0f, 0.0f, 50.0f);
                Gl.glVertex3f(0.0f, 50.0f, 50.0f);

                Gl.glTexCoord2f(0, 1); Gl.glVertex3f(-50.0F, 10.0F, 50.0F);
                Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-50.0F, 10.0F, -50.0F);
                Gl.glTexCoord2f(1, 0); Gl.glVertex3f(50.0F, 10.0F, -50.0F);
                Gl.glTexCoord2f(1, 1); Gl.glVertex3f(50.0F, 10.0F, 50.0F);

                Gl.glEnd();*/



                Draw();

                // Finally, display the rendered frame on screen
                App.Display();

            }
            // Don't forget to destroy our texture
            int tex = 0;
            Gl.glDeleteTextures(1, ref tex);
        }

        public void Initialize()
        {
            // Create main window

            App.PreserveOpenGLStates(true);

            // Setup event handlers
            App.Closed += new EventHandler(OnClosed);
            App.KeyPressed += new EventHandler<KeyEventArgs>(OnKeyPressed);
            App.Resized += new EventHandler<SizeEventArgs>(OnResized);
        }

        private void LoadContent()
        {
            BackgroundImage = new Image("background.jpg");
            Background = new Sprite(BackgroundImage);

            Text = new String2D("This is a cube");
            Text.Position = new Vector2(0, 0);
            Text.Color = Color.Black;

            // Enable Z-buffer read and write
            Gl.glEnable(Gl.GL_DEPTH_TEST);
            Gl.glDepthMask(Gl.GL_TRUE);
            Gl.glClearDepth(1.0F);

            // Setup a perspective projection

            Gl.glMatrixMode(Gl.GL_PROJECTION);
            Gl.glLoadIdentity();
            Glu.gluPerspective(90.0F, 1.0F, 1.0F, 500.0F); // I assume this is setting up the camera

            LoadTexture(new Image("texture.jpg"), 0);

            LoadTexture(new Image("Otexture.jpg"), 1);


        }

        private void Draw()
        {
            App.Draw(Text);
        }

        private void LoadTexture(Image Texture, int texNum)
        {

            using (Image TempImage = Texture)
            {

                Gl.glGenTextures(1, out iTextures[texNum]); // Texture name, which is a number

                Gl.glBindTexture(Gl.GL_TEXTURE_2D, iTextures[texNum]); // Start using the texture


                Console.WriteLine(texNum + "");
                // Texture options and filters and stuff
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
                Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR_MIPMAP_LINEAR);

                Glu.gluBuild2DMipmaps(Gl.GL_TEXTURE_2D, Gl.GL_RGBA, (int)TempImage.Width, (int)TempImage.Height, Gl.GL_RGBA, Gl.GL_UNSIGNED_BYTE, TempImage.Pixels);
                //Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA, (int)TempImage.Width, (int)TempImage.Height, 0, Gl.GL_RGBA, Gl.GL_UNSIGNED_BYTE, TempImage.Pixels);

            }
            Gl.glEnable(Gl.GL_TEXTURE_2D);
        }
        private void UseTexture(int iTexture)
        {


            // Bind our texture for use
            //Gl.glEnable(Gl.GL_TEXTURE_2D); // Start using the 2D texture
            Gl.glBindTexture(Gl.GL_TEXTURE_2D, iTexture); // Bind our texture for current use
            Gl.glColor4f(1.0F, 1.0F, 1.0F, 1.0F); // Set color to..white, I think.
        }



        void DrawCube(float xPos, float yPos, float zPos, int texture)
        {

            Gl.glPushMatrix();

            //UseTexture(1);
            Gl.glBegin(Gl.GL_QUADS);
            UseTexture(iTextures[0]);
            //Gl.glEnable(Gl.GL_TEXTURE_2D);



            /*      This is the top face*/
            Gl.glVertex3f(0.0f, 0.0f, 0.0f);
            Gl.glVertex3f(0.0f, 0.0f, -1.0f);
            Gl.glVertex3f(-1.0f, 0.0f, -1.0f);
            Gl.glVertex3f(-1.0f, 0.0f, 0.0f);

            /*      This is the front face*/
            Gl.glTexCoord2f(0, 1); Gl.glVertex3f(0.0f, 0.0f, 0.0f);
            Gl.glTexCoord2f(0, 0); Gl.glVertex3f(-1.0f, 0.0f, 0.0f);
            Gl.glTexCoord2f(1, 0); Gl.glVertex3f(-1.0f, -1.0f, 0.0f);
            Gl.glTexCoord2f(1, 1); Gl.glVertex3f(0.0f, -1.0f, 0.0f);

            /*      This is the right face*/
            Gl.glVertex3f(0.0f, 0.0f, 0.0f);
            Gl.glVertex3f(0.0f, -1.0f, 0.0f);
            Gl.glVertex3f(0.0f, -1.0f, -1.0f);
            Gl.glVertex3f(0.0f, 0.0f, -1.0f);

            /*      This is the left face*/
            Gl.glVertex3f(-1.0f, 0.0f, 0.0f);
            Gl.glVertex3f(-1.0f, 0.0f, -1.0f);
            Gl.glVertex3f(-1.0f, -1.0f, -1.0f);
            Gl.glVertex3f(-1.0f, -1.0f, 0.0f);

            /*      This is the bottom face*/
            Gl.glVertex3f(0.0f, 0.0f, 0.0f);
            Gl.glVertex3f(0.0f, -1.0f, -1.0f);
            Gl.glVertex3f(-1.0f, -1.0f, -1.0f);
            Gl.glVertex3f(-1.0f, -1.0f, 0.0f);

            /*      This is the back face*/
            Gl.glVertex3f(0.0f, 0.0f, 0.0f);
            Gl.glVertex3f(-1.0f, 0.0f, -1.0f);
            Gl.glVertex3f(-1.0f, -1.0f, -1.0f);
            Gl.glVertex3f(0.0f, -1.0f, -1.0f);

            Gl.glEnd();
            Gl.glPopMatrix();
        }

任何帮助都是极好的。

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1 回答 1

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你不是在谈论多重纹理；您正在谈论在同一应用程序中使用多个纹理。

好吧，我看到了几个问题。

Gl.glGenTextures(2, out iTexture); // Texture name, which is a number

我承认我不是 100% 熟悉 C# 的语法，所以我假设它的out工作原理更像是在 C/C++ 中传递一个指针。因此，您希望glGenTextures将纹理对象编号写入iTexture.

这里有两个问题。首先，iTexture是一个整数。但是你告诉glGenTextures过你在这个函数调用中生成了两个纹理，而不是一个。这将需要传递一个整数数组glGenTextures来写入。所以你冒着破坏......堆栈的风险？我不知道你是如何将这些调用编组到 C++ 的，但无论你在做什么，glGenTextures都可能是在随机内存上写入。你很幸运没有撞车。

每次调用LoadTexture都应该创建一个 OpenGL 纹理对象。因此，您不应该尝试从一次LoadTexture调用中创建两个。

另一个问题是你的函数iTexture没有返回。LoadTexture您不会将其存储在任何地方。事实上，当你调用 时LoadTexture，你甚至没有给它一个输出变量；你给它一个数字文字。同样，我不是 C# 专家，但我很确定您需要一些特殊的语法才能将参数用作函数输出，特别是对于int.

您的LoadTexture函数应该返回 OpenGL 纹理名称（或将它们存储在某处），并且匹配的UseTexture调用应该从中获取这些特定名称。

新代码问题：

// Don't forget to destroy our texture
int tex = 0;
Gl.glDeleteTextures(1, ref tex);

您不能删除纹理 0。这通常是人们不使用纹理 0 存储实际纹理的原因；它通常被视为“不存在的纹理”，如 NULL。

至于您的实际绘图代码：

Gl.glBegin(Gl.GL_QUADS);
UseTexture(iTextures[0]);

您不能在/调用glBindTexture之间调用（或大多数 OpenGL 函数）。应该在开始四边形之前调用。另外，应该启用. 我知道您在其他地方使用它，但最好将命令放在它们真正重要的地方。如果要进行无纹理渲染，则必须禁用。glBeginglEndUseTextureUseTextureGL_TEXTURE_2DGL_TEXTURE_2D

另外，当您只给出一个四边形纹理坐标时，您期望会发生什么？您希望其他四边形看起来像什么？因为如果您认为这些四边形将是无纹理的，那您就错了。

于 2011-07-22T05:27:33.777 回答