SharpGL WPF 不使用 gl.DrawArrays() 和 gl.VertexPointer() 绘制

Question

我正在尝试使用 SharpGL 在使用 gl.VertexPointer() 和 gl.DrawArrays() 的 WPF 应用程序中呈现。但我无法让它渲染一个正方形。背景变为绿色，我可以在 WPF 面板的左下方看到 FPS 绘图。添加正方形代码时，FPS 文本也消失了，我只有一个空白屏幕。

我正在做与我在 C++ 项目中所做的完全相同的事情，它工作得很好。我不知道我遗漏了什么或做错了什么。

XAML

<Window x:Class="NodePlusPlus.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:NodePlusPlus"
        xmlns:gl="clr-namespace:SharpGL.WPF;assembly=SharpGL.WPF"
        mc:Ignorable="d"
        Title="MainWindow" Height="900" Width="1600" Background="#FF202020">
    <Grid x:Name="MainGrid">
        
        <gl:OpenGLControl x:Name="glPanel" DrawFPS="True" />

    </Grid>
</Window>

C#

        public MainWindow()
        {
            InitializeComponent();

            glPanel.OpenGLInitialized += glPanel_OpenGLInitialized;
            glPanel.OpenGLDraw += glPanel_OpenGLDraw;
            glPanel.Resized += glPanel_Resized;
        }

        private void glPanel_Resized(object sender, SharpGL.WPF.OpenGLRoutedEventArgs args)
        {
            OpenGL gl = args.OpenGL;
            gl.Ortho2D(0, Width, 0, Height);
        }

        private void glPanel_OpenGLInitialized(object sender, SharpGL.WPF.OpenGLRoutedEventArgs args)
        {
            OpenGL gl = args.OpenGL;

            gl.Hint(OpenGL.GL_PERSPECTIVE_CORRECTION_HINT, OpenGL.GL_FASTEST);
            gl.ShadeModel(OpenGL.GL_SMOOTH);
            gl.Enable(OpenGL.GL_CULL_FACE);
            gl.Enable(OpenGL.GL_TEXTURE_2D);
            gl.Enable(OpenGL.GL_BLEND);
            gl.Enable(OpenGL.GL_DEPTH_TEST);
            gl.BlendFunc(OpenGL.GL_SRC_ALPHA, OpenGL.GL_ONE_MINUS_SRC_ALPHA);
            gl.EnableClientState(OpenGL.GL_VERTEX_ARRAY);
            gl.EnableClientState(OpenGL.GL_TEXTURE_COORD_ARRAY);
            gl.ClearColor(0.0f, 1.0f, 0.0f, 0.1f);
        }

        private void glPanel_OpenGLDraw(object sender, SharpGL.WPF.OpenGLRoutedEventArgs args)
        {
            OpenGL gl = args.OpenGL;

            // Clear the color and depth buffers
            gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
            gl.LoadIdentity();
            
            // Build a rectangle
            float Width     = 100.0f;
            float Height    = 100.0f;
            float[] vertices = new float[18];
            vertices[0]  = 0;       vertices[1] = 0;        vertices[2] = 0.0f;
            vertices[3]  = 0;       vertices[4] = Height;   vertices[5] = 0.0f;
            vertices[6]  = Width;   vertices[7] = Height;   vertices[8] = 0.0f;

            vertices[9]  = 0;       vertices[10] = 0;       vertices[11] = 0.0f;
            vertices[12] = Width;   vertices[13] = Height;  vertices[14] = 0.0f;
            vertices[15] = Width;   vertices[16] = 0;       vertices[17] = 0.0f;


            // If I remove this whole Begin()-End() section, it will render the Open GL FPS.  With this draw code here, it does not render the FPS.
            gl.Begin(OpenGL.GL_TRIANGLES);

            gl.Translate(0.0f, 0.0f, 0.0f);
            gl.Color(0.0f, 0.0f, 0.0f, 1.0f);
            gl.VertexPointer(3, 0, vertices);
            gl.DrawArrays(OpenGL.GL_TRIANGLES, 0, 6);

            gl.End();

            gl.Flush();
        }

有Draw代码...

没有绘制代码...

Answer 1

如@BDL所述，在这种情况下不使用glBegin()和glEnd()。

如@Rabbid76 所述，glEnableClientState(OpenGL.GL_TEXTURE_COORD_ARRAY) 应该删除，因为我没有使用纹理坐标。

感谢大家的帮助！

在具体示例中还需要删除 gl.Enable(OpenGL.GL_CULL_FACE) 以绘制我的正方形。正如@Rabbid76 提到的，默认的绕组顺序是逆时针的。我的顶点顺时针旋转。

最终结果

        private void glPanel_OpenGLInitialized(object sender, SharpGL.WPF.OpenGLRoutedEventArgs args)
        {
            OpenGL gl = args.OpenGL;

            gl.Hint(OpenGL.GL_PERSPECTIVE_CORRECTION_HINT, OpenGL.GL_FASTEST);
            gl.ShadeModel(OpenGL.GL_SMOOTH);
            gl.Enable(OpenGL.GL_TEXTURE_2D);
            gl.Enable(OpenGL.GL_BLEND);
            gl.Enable(OpenGL.GL_DEPTH_TEST);
            gl.BlendFunc(OpenGL.GL_SRC_ALPHA, OpenGL.GL_ONE_MINUS_SRC_ALPHA);
            gl.EnableClientState(OpenGL.GL_VERTEX_ARRAY);
            gl.ClearColor(0.0f, 1.0f, 0.0f, 0.1f);
        }

        private void glPanel_OpenGLDraw(object sender, SharpGL.WPF.OpenGLRoutedEventArgs args)
        {
            OpenGL gl = args.OpenGL;

            // Clear the color and depth buffers
            gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
            gl.LoadIdentity();
            
            // Build a rectangle
            float Width     = 100.0f;
            float Height    = 100.0f;
            float[] vertices = new float[18];
            vertices[0]  = 0;       vertices[1] = 0;        vertices[2] = 0.0f;
            vertices[3]  = 0;       vertices[4] = Height;   vertices[5] = 0.0f;
            vertices[6]  = Width;   vertices[7] = Height;   vertices[8] = 0.0f;

            vertices[9]  = 0;       vertices[10] = 0;       vertices[11] = 0.0f;
            vertices[12] = Width;   vertices[13] = Height;  vertices[14] = 0.0f;
            vertices[15] = Width;   vertices[16] = 0;       vertices[17] = 0.0f;

            gl.Translate(0.0f, 0.0f, 0.0f);
            gl.Color(0.0f, 0.0f, 0.0f, 1.0f);
            gl.VertexPointer(3, 0, vertices);
            gl.DrawArrays(OpenGL.GL_TRIANGLES, 0, 6);

            gl.Flush();
        }

SharpGL WPF 不使用 gl.DrawArrays() 和 gl.VertexPointer() 绘制

SharpGL WPF Not drawing with gl.DrawArrays() and gl.VertexPointer()

c#

opengl

wpf

xaml

sharpgl