Silk.NET•5w ago

Why doesn't this work? Launching the

Why doesn't this work? Launching the program in RenderDoc and capturing a frame results in an error: Incorrect API Use: Vertex buffer Buffer 50 bound to attribute 0: aPos (buffer slot 0) at draw is 0-sized! Has this buffer been initialized?

1 Reply

TheNew1234OP•5w ago

BufferObject class:

public class BufferObject<TType> where TType : unmanaged
{
    private uint handleID;
    private BufferTargetARB bufferType;

    public unsafe BufferObject(TType[] data, BufferTargetARB bufferType, BufferUsageARB bufferUsage)
    {
        this.bufferType = bufferType;
        handleID = gl.GenBuffer();

        fixed (void* dataPointer = data)
        {
            gl.BufferData(this.bufferType, (nuint)(data.Length * sizeof(TType)), dataPointer, bufferUsage);
        }
    }

    public unsafe BufferObject(List<TType> data, BufferTargetARB bufferType, BufferUsageARB bufferUsage)
    {
        this.bufferType = bufferType;
        handleID = gl.GenBuffer();

        fixed (void* dataPointer = data.ToArray())
        {
            gl.BufferData(bufferType, (nuint)(data.Count * sizeof(TType)), dataPointer, bufferUsage);
            logger.Information("Buffer {bufferID} data: {data}", handleID, data);
        }
    }

    public void Bind()
    {
        gl.BindBuffer(bufferType, handleID);
    }

    public void Unbind()
    {
        gl.BindBuffer(bufferType, 0);
    }

    public void Dispose()
    {
        gl.DeleteBuffer(handleID);
    }
}

public class BufferObject<TType> where TType : unmanaged
{
    private uint handleID;
    private BufferTargetARB bufferType;

    public unsafe BufferObject(TType[] data, BufferTargetARB bufferType, BufferUsageARB bufferUsage)
    {
        this.bufferType = bufferType;
        handleID = gl.GenBuffer();

        fixed (void* dataPointer = data)
        {
            gl.BufferData(this.bufferType, (nuint)(data.Length * sizeof(TType)), dataPointer, bufferUsage);
        }
    }

    public unsafe BufferObject(List<TType> data, BufferTargetARB bufferType, BufferUsageARB bufferUsage)
    {
        this.bufferType = bufferType;
        handleID = gl.GenBuffer();

        fixed (void* dataPointer = data.ToArray())
        {
            gl.BufferData(bufferType, (nuint)(data.Count * sizeof(TType)), dataPointer, bufferUsage);
            logger.Information("Buffer {bufferID} data: {data}", handleID, data);
        }
    }

    public void Bind()
    {
        gl.BindBuffer(bufferType, handleID);
    }

    public void Unbind()
    {
        gl.BindBuffer(bufferType, 0);
    }

    public void Dispose()
    {
        gl.DeleteBuffer(handleID);
    }
}

VAO class:

public class VAO<TVboType, TEboType> where TVboType : unmanaged where TEboType : unmanaged
{
    private uint handleID;

    public VAO(BufferObject<TVboType> VBO, BufferObject<TEboType> EBO)
    {
        handleID = gl.GenVertexArray();
    }

    public unsafe void Attributes(BufferObject<TVboType> vbo, uint layout, uint numComponents, VertexAttribPointerType type, uint vertexSize, uint offset)
    {
        vbo.Bind();
        gl.VertexAttribPointer(layout, (int)numComponents, type, false, (uint)(vertexSize * sizeof(TVboType)), (void*)offset);
        gl.EnableVertexAttribArray(layout);
        vbo.Unbind();
    }

    public void Bind()
    {
        gl.BindVertexArray(handleID);
    }

    public void Unbind()
    {
        gl.BindVertexArray(0);
    }

    public void Dispose()
    {
        gl.DeleteVertexArray(handleID);
    }
}

public class VAO<TVboType, TEboType> where TVboType : unmanaged where TEboType : unmanaged
{
    private uint handleID;

    public VAO(BufferObject<TVboType> VBO, BufferObject<TEboType> EBO)
    {
        handleID = gl.GenVertexArray();
    }

    public unsafe void Attributes(BufferObject<TVboType> vbo, uint layout, uint numComponents, VertexAttribPointerType type, uint vertexSize, uint offset)
    {
        vbo.Bind();
        gl.VertexAttribPointer(layout, (int)numComponents, type, false, (uint)(vertexSize * sizeof(TVboType)), (void*)offset);
        gl.EnableVertexAttribArray(layout);
        vbo.Unbind();
    }

    public void Bind()
    {
        gl.BindVertexArray(handleID);
    }

    public void Unbind()
    {
        gl.BindVertexArray(0);
    }

    public void Dispose()
    {
        gl.DeleteVertexArray(handleID);
    }
}

Mesh class:

public unsafe class Mesh
{
    private BufferObject<float> VBO;
    private BufferObject<uint> EBO;
    private VAO<float, uint> VAO;

    private List<float> vertices;
    private List<uint> indices;

    public Mesh(List<float> vertices, List<uint> indices)
    {
        this.vertices = vertices;
        this.indices = indices;

        VAO = new VAO<float, uint>(VBO, EBO);
        VAO.Bind();

        VBO = new BufferObject<float>(this.vertices, BufferTargetARB.ArrayBuffer, BufferUsageARB.StaticDraw);
        VBO.Bind();

        EBO = new BufferObject<uint>(this.indices, BufferTargetARB.ElementArrayBuffer, BufferUsageARB.StaticDraw);
        EBO.Bind();


        VAO.Attributes(VBO, 0, 2, VertexAttribPointerType.Float, 2, 0 * sizeof(float));

        /*VBO.Unbind();
        EBO.Unbind();
        VAO.Unbind();*/
    }

    public void Render()
    {
        VBO.Bind();
        EBO.Bind();

        gl.DrawElements(PrimitiveType.Triangles, (uint)indices.Count, DrawElementsType.UnsignedInt, null);
    }

    public void Dispose()
    {
        VBO.Dispose();
        VAO.Dispose();
        EBO.Dispose();
    }
}

public unsafe class Mesh
{
    private BufferObject<float> VBO;
    private BufferObject<uint> EBO;
    private VAO<float, uint> VAO;

    private List<float> vertices;
    private List<uint> indices;

    public Mesh(List<float> vertices, List<uint> indices)
    {
        this.vertices = vertices;
        this.indices = indices;

        VAO = new VAO<float, uint>(VBO, EBO);
        VAO.Bind();

        VBO = new BufferObject<float>(this.vertices, BufferTargetARB.ArrayBuffer, BufferUsageARB.StaticDraw);
        VBO.Bind();

        EBO = new BufferObject<uint>(this.indices, BufferTargetARB.ElementArrayBuffer, BufferUsageARB.StaticDraw);
        EBO.Bind();


        VAO.Attributes(VBO, 0, 2, VertexAttribPointerType.Float, 2, 0 * sizeof(float));

        /*VBO.Unbind();
        EBO.Unbind();
        VAO.Unbind();*/
    }

    public void Render()
    {
        VBO.Bind();
        EBO.Bind();

        gl.DrawElements(PrimitiveType.Triangles, (uint)indices.Count, DrawElementsType.UnsignedInt, null);
    }

    public void Dispose()
    {
        VBO.Dispose();
        VAO.Dispose();
        EBO.Dispose();
    }
}

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Why doesn't this work? Launching the