managed directx實(shí)現(xiàn)讀寫buffer (Read and Write VertexBuffer and IndexBuffer Data)

Read and Write VertexBuffer and IndexBuffer Data With GraphicsStreams

using System;

using Microsoft.DirectX;

using Microsoft.DirectX.Direct3D;

public struct PositionNormalTexVertex

{

public Vector3 Position;

public Vector3 Normal;

public float Tu0, Tv0;

public static readonly VertexFormats FVF = VertexFormats.Position | VertexFormats.Texture1;

}

public class Example

{

public unsafe void GraphicsStreamReadWrite()

{

// Create a vertex buffer in the managed pool

VertexBuffer vb = new VertexBuffer( typeof (PositionNormalTexVertex), 100 , device, Usage.None, PositionNormalTexVertex.FVF, Pool.Managed);

// First, fill an array of PositionNormalTexVertex elements with data.

PositionNormalTexVertex[] vertices = new PositionNormalTexVertex[ 50 ];

for ( int i = 0 ; i < 50 ; i ++ )

{

// fill the vertices with some data

vertices[i].Position = new Vector3(3f,4f,5f);

}

// The size of the verticies are 32-bytes each (float3 (12) + float3 (12) + float(4) + float(4))

// To lock 50 verticies, the size of the lock would be 1600 (32 * 50)

GraphicsStream vbData = vb.Lock( 0 , 1600 , LockFlags.None);

// copy the vertex data into the vertex buffer

vbData.Write(vertices);

// Unlock the VB

vb.Unlock();

// This time, lock the entire VertexBuffer

vbData = vb.Lock( 0 , 3200 , LockFlags.None);

// Cast the InternalDataPointer (a void pointer) to an array of verticies

PositionNormalTexVertex * vbArray = (PositionNormalTexVertex * ) vbData.InternalDataPointer;

for ( int i = 0 ; i < 100 ; i ++ )

{

// perform some operations on the data

vbArray[i].Tu0 = i;

vbArray[i].Tv0 = vbArray[i].Tu0 * 2 ;

Console.WriteLine(vbArray[i].Tv0.ToString());

}

// Unlock the buffer

vb.Unlock();

vb.Dispose();

}

Read and Write VertexBuffer Data With Arrays

using System;

using Microsoft.DirectX;

using Microsoft.DirectX.Direct3D;

public struct PositionNormalTexVertex

{

public Vector3 Position;

public Vector3 Normal;

public float Tu0, Tv0;

public static readonly VertexFormats FVF = VertexFormats.Position | VertexFormats.Texture1;

}

public class Example

{

public void ArrayBasedReadWrite()

{

//Create a vertex buffer in the managed pool

VertexBuffer vb = new VertexBuffer(typeof(PositionNormalTexVertex), 100, device, Usage.None, PositionNormalTex1Vertex.FVF, Pool.Managed);

//Fill an array of the appropriate type with the VB data using Lock()

PositionNormalTexVertex[] vbData = (PositionNormalTexVertex[]) vb.Lock(0, typeof(PositionNormalTexVertex), LockFlags.None, 50);

for(int i=0; i<50; i++)

{

//set your vertices to something

vbData[i].Position = new Vector3(2f,2f,2f);

vbData[i].Normal = new Vector3(1f,0f,0f);

vbData[i].Tu0 = i;

vbData[i].Tv0 = i;

}

//Unlock the vb before you can use it elsewhere

vb.Unlock();

//This lock overload simply locks the entire VB -- setting ReadOnly //can improve perf when reading a vertexbuffer

vbData = (PositionNormalTexVertex[]) vb.Lock(0, LockFlags.ReadOnly);

for(int i=0; i<100; i++)

{

//read some vertex data

Console.WriteLine("Vertex " + i + "Tu: " + vbData[i].Tu0 + " , Tv: " + vbData[i].Tv0);

}

//Unlock the buffer

vb.Unlock();

vb.Dispose();

}

posted on 2006-06-09 16:39 夢(mèng)在天涯閱讀(1391) 評(píng)論(1) 編輯收藏引用所屬分類: DirectX

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# re: managed directx實(shí)現(xiàn)讀寫buffer (Read and Write VertexBuffer and IndexBuffer Data)[未登錄](méi) 2007-11-09 15:34 夢(mèng)在天涯

除了上面提到的vertexbuffer來(lái)存model。

我們還可以使用indexbuffer+vertexbuffer來(lái)存，

還可以使用vertexelement+vertexbuffer來(lái)存。回復(fù) 更多評(píng)論

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# re: managed directx實(shí)現(xiàn)讀寫buffer (Read and Write VertexBuffer and IndexBuffer Data)[未登錄](méi) 2007-11-09 15:34 夢(mèng)在天涯

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managed directx實(shí)現(xiàn)讀寫buffer (Read and Write VertexBuffer and IndexBuffer Data)

Read and Write VertexBuffer and IndexBuffer Data With GraphicsStreams

Read and Write VertexBuffer Data With Arrays

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