Question

我在https://en.wikibooks.org/wiki/OpenGL_Programming/Post-Processing上遵循了C ++ OpenGL教程，并尝试使用OpenTK将其翻译为C＃。

现在，我创建了一个Framebuffer对象和一个Shader对象在我调用GL.VertexAttribPointer之前，它一切正常（没有OpenGL错误，没有着色器编译/链接错误，没有程序错误）。有一个原生的例外：

Exception thrown at 0x68A9ED7C (nvoglv32.dll) in MyApplication.exe: 0xC0000005: Access violation reading location 0x0EB02DE8.

此外，在我的渲染代码中，我也使用GL.VertexPointer和GL.DrawArrays。这可能与此有关吗？

这是帧缓冲码：

        int screenWidth = CraftGame.GetCraft().ClientRectangle.Width;
        int screenHeight = CraftGame.GetCraft().ClientRectangle.Height;
        GL.ActiveTexture(TextureUnit.Texture0);
        fbo_texture = GL.GenTexture();
        GL.BindTexture(TextureTarget.Texture2D, fbo_texture);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToEdge);
        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToEdge);
        GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, screenWidth, screenHeight, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
        GL.BindTexture(TextureTarget.Texture2D, 0);

        rbo_depth = GL.GenRenderbuffer();
        GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, rbo_depth);
        GL.RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferStorage.DepthComponent16, screenWidth, screenHeight);
        GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, 0);

        GL.GenFramebuffers(1, out fbo);
        GL.BindFramebuffer(FramebufferTarget.Framebuffer, fbo);
        GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2D, fbo_texture, 0);
        GL.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, RenderbufferTarget.Renderbuffer, rbo_depth);
        GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);

        float[] fbo_vertices =
        {
            -1, -1,
            1, -1,
            -1,  1,
            1,  1,
        };

        GL.GenBuffers(1, out vbo_fbo_vertices);
        GL.BindBuffer(BufferTarget.ArrayBuffer, vbo_fbo_vertices);
        GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(fbo_vertices.Length * sizeof(float)), fbo_vertices, BufferUsageHint.StaticDraw);
        GL.BindBuffer(BufferTarget.ArrayBuffer, 0);

这是着色器代码

public void Initialize()
        {
            int vs = CreateShader("postproc.v.glsl", ShaderType.VertexShader);
            int fs = CreateShader("postproc.f.glsl", ShaderType.FragmentShader);

            program_postproc = GL.CreateProgram();
            GL.AttachShader(program_postproc, vs);
            GL.AttachShader(program_postproc, fs);
            GL.LinkProgram(program_postproc);

            GL.ValidateProgram(program_postproc);


            attribute_v_coord_postproc = GL.GetAttribLocation(program_postproc, "v_coord");

            uniform_fbo_texture = GL.GetUniformLocation(program_postproc, "fbo_texture");
        }

        private int CreateShader(string name, ShaderType shaderType)
        {
            string shaderCode = File.ReadAllText(Path.Combine(Application.StartupPath, "shader", name));
            int shaderId = GL.CreateShader(shaderType);
            GL.ShaderSource(shaderId, shaderCode);
            GL.CompileShader(shaderId);
            if (!GetCompileStatus(shaderId))
            {
                MessageBox.Show("ERROR COMPILING SHADER\n" + shaderCode);
            }
            return shaderId;
        }

渲染

        // Rendering to framebuffer
        Framebuffer.BindFramebuffer();
        GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
        GLStateManager.SetupViewport();
        ApplyCamera();
        // ...
        Framebuffer.UnbindFramebuffer();

        // Rendering framebuffer to screen
        GL.ClearColor(0.0F, 0.0F, 0.0F, 1.0F);
        GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
        GL.UseProgram(Shader.program_postproc);
        GL.BindTexture(TextureTarget.Texture2D, Framebuffer.fbo_texture);
        GL.Uniform1(Shader.uniform_fbo_texture, 0);

        // TODO: Why does it fail here
        GL.EnableVertexAttribArray(Shader.attribute_v_coord_postproc);
        GL.BindBuffer(BufferTarget.ArrayBuffer, Framebuffer.vbo_fbo_vertices);
        GL.VertexAttribPointer(
            Shader.attribute_v_coord_postproc,
            2,
            VertexAttribPointerType.Float,
            false,
            0,
            0
        );
        GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
        GL.DisableVertexAttribArray(Shader.attribute_v_coord_postproc);

        SwapBuffers();

着色器的代码来自教程

我是使用framebuffers的新手。任何帮助将非常感谢。

OpenTK Framebuffer EnableVertexAttribArray崩溃

0 个答案: