Managed Directx --rendering vertices (使用VertexBuffer 進(jìn)行render)

// -----------------------------------------------------------------------------

// ?File:?Vertices.cs

// ?Desc:?In?this?tutorial,?we?are?rendering?some?vertices.?This?introduces?the

// ???????concept?of?the?vertex?buffer,?a?Direct3D?object?used?to?store

// ???????vertices.?Vertices?can?be?defined?any?way?we?want?by?defining?a

// ???????custom?structure?and?a?custom?FVF?(flexible?vertex?format).?In?this

// ???????tutorial,?we?are?using?vertices?that?are?transformed?(meaning?they

// ???????are?already?in?2D?window?coordinates)?and?lit?(meaning?we?are?not

// ???????using?Direct3D?lighting,?but?are?supplying?our?own?colors).

// ?Copyright?(c)?Microsoft?Corporation.?All?rights?reserved.

// -----------------------------------------------------------------------------

using ?System;

using ?System.Drawing;

using ?System.Windows.Forms;

using ?Microsoft.DirectX;

using ?Microsoft.DirectX.Direct3D;

namespace ?VerticesTutorial

{

???? public ? class ?Vertices?:?Form

???? {

???????? // ?Our?global?variables?for?this?project

????????Device?device? = ? null ;? // ?Our?rendering?device

????????VertexBuffer?vertexBuffer? = ? null ;

???????? public ?Vertices()

???????? {

???????????? // ?Set?the?initial?size?of?our?form

???????????? this .ClientSize? = ? new ?System.Drawing.Size( 300 , 300 );

???????????? // ?And?its?caption

???????????? this .Text? = ? " Direct3D?Tutorial?2?-?Vertices " ;

????????}

????????

???????? public ? bool ?InitializeGraphics()

???????? {

???????????? try

???????????? {

???????????????? // ?Now?let's?setup?our?D3D?stuff

????????????????PresentParameters?presentParams? = ? new ?PresentParameters();

????????????????presentParams.Windowed = true ;

????????????????presentParams.SwapEffect? = ?SwapEffect.Discard;

????????????????device? = ? new ?Device( 0 ,?DeviceType.Hardware,? this ,?CreateFlags.SoftwareVertexProcessing,?presentParams);

???????????????? this .OnCreateDevice(device,? null );

???????????????? return ? true ;

????????????}

???????????? catch ?(DirectXException)

???????????? {?

???????????????? return ? false ;?

????????????}

????????}

???????? public ? void ?OnCreateDevice( object ?sender,?EventArgs?e)

???????? {

????????????Device?dev? = ?(Device)sender;

???????????? // ?Now?Create?the?VB

????????????vertexBuffer? = ? new ?VertexBuffer( typeof (CustomVertex.TransformedColored),? 3 ,?dev,? 0 ,?CustomVertex.TransformedColored.Format,?Pool.Default);

????????????vertexBuffer.Created? += ? new ?System.EventHandler( this .OnCreateVertexBuffer);

???????????? this .OnCreateVertexBuffer(vertexBuffer,? null );

????????}

???????? public ? void ?OnCreateVertexBuffer( object ?sender,?EventArgs?e)

???????? {

????????????VertexBuffer?vb? = ?(VertexBuffer)sender;

????????????GraphicsStream?stm? = ?vb.Lock( 0 ,? 0 ,? 0 );

????????????CustomVertex.TransformedColored[]?verts? = ? new ?CustomVertex.TransformedColored[ 3 ];

????????????verts[ 0 ].X = 150 ;verts[ 0 ].Y = 50 ;verts[ 0 ].Z = 0.5f ;?verts[ 0 ].Rhw = 1 ;?verts[ 0 ].Color? = ?System.Drawing.Color.Red.ToArgb();

????????????verts[ 1 ].X = 250 ;verts[ 1 ].Y = 250 ;verts[ 1 ].Z = 0.5f ;?verts[ 1 ].Rhw = 1 ;?verts[ 1 ].Color? = ?System.Drawing.Color.Yellow.ToArgb();

????????????verts[ 2 ].X = 50 ;verts[ 2 ].Y = 250 ;verts[ 2 ].Z = 0.5f ;?verts[ 2 ].Rhw = 1 ;?verts[ 2 ].Color? = ?System.Drawing.Color.SkyBlue.ToArgb();

????????????stm.Write(verts);

????????????vb.Unlock();

????????}

???????? private ? void ?Render()

???????? {

???????????? if ?(device? == ? null )?

???????????????? return ;

???????????? // Clear?the?backbuffer?to?a?blue?color?(ARGB?=?000000ff)

????????????device.Clear(ClearFlags.Target,?System.Drawing.Color.Blue,? 1.0f ,? 0 );

???????????? // Begin?the?scene

????????????device.BeginScene();

????????????

????????????device.SetStreamSource(? 0 ,?vertexBuffer,? 0 );

????????????device.VertexFormat? = ?CustomVertex.TransformedColored.Format;

????????????device.DrawPrimitives(PrimitiveType.TriangleList,? 0 ,? 1 );

???????????? // End?the?scene

????????????device.EndScene();

????????????device.Present();

????????}

???????? protected ? override ? void ?OnPaint(System.Windows.Forms.PaintEventArgs?e)

???????? {

???????????? this .Render();? // ?Render?on?painting

????????}

???????? protected ? override ? void ?OnKeyPress(System.Windows.Forms.KeyPressEventArgs?e)

???????? {

???????????? if ?(( int )( byte )e.KeyChar? == ?( int )System.Windows.Forms.Keys.Escape)

???????????????? this .Close();? // ?Esc?was?pressed

????????}

???????? /// ? <summary>

???????? /// ?The?main?entry?point?for?the?application.

???????? /// ? </summary>

???????? static ? void ?Main()?

???????? {

???????????? using ?(Vertices?frm? = ? new ?Vertices())

???????????? {

???????????????? if ?( ! frm.InitializeGraphics())? // ?Initialize?Direct3D

???????????????? {

????????????????????MessageBox.Show( " Could?not?initialize?Direct3D.??This?tutorial?will?exit. " );

???????????????????? return ;

????????????????}

????????????????frm.Show();

???????????????? // ?While?the?form?is?still?valid,?render?and?process?messages

???????????????? while (frm.Created)

???????????????? {

????????????????????frm.Render();

????????????????????Application.DoEvents();

????????????????}

????????????}

????????}

????}

}

1 定義 VertexBuffer vb = null;
2 創(chuàng)建 VertexBuffer?
??? public void OnCreateDevice(object sender, EventArgs e)
??? {
??? Device dev = (Device)sender;
???
??? // Now create the vertex buffer
??? vertexBuffer = new VertexBuffer(
??????? typeof(CustomVertex.TransformedColored), 3, dev, 0,
??????? CustomVertex.TransformedColored.Format, Pool.Default);
??? vertexBuffer.Created +=
??????? new System.EventHandler(this.OnCreateVertexBuffer);
??? this.OnCreateVertexBuffer(vb, null);
??? }

??? public void OnCreateVertexBuffer(object sender, EventArgs e)
??? {
??? VertexBuffer vb = (VertexBuffer)sender;
??? GraphicsStream stm = vb.Lock(0, 0, 0);?? //Lock() 保證cpu能夠直接訪問 VertexBuffer ,必須和unlock()一起使用
??? CustomVertex.TransformedColored[] verts =
??????? new CustomVertex.TransformedColored[3];
??? .
??? .
??? .
??? vb.Unlock();
??? }
3? GraphicsStream對象直接訪問vertexbuffer, 或者說把vertexbuffer的內(nèi)容放到Graphicsstream中以合適的大小.
verts[0].X=150; verts[0].Y=50; verts[0].Z=0.5f; verts[0].Rhw=1;
verts[0].Color = System.Drawing.Color.Aqua.ToArgb();

verts[1].X=250; verts[1].Y=250; verts[1].Z=0.5f; verts[1].Rhw=1;
verts[1].Color = System.Drawing.Color.Brown.ToArgb();

verts[2].X=50; verts[2].Y=250; verts[2].Z=0.5f; verts[2].Rhw=1;
verts[2].Color = System.Drawing.Color.LightPink.ToArgb();

stm.Write(verts);
4 render device
private void Render()
{
??? if (device == null)
??? return;
???
??? // Clear the back buffer to a blue color (ARGB = 000000ff)
??? device.Clear(ClearFlags.Target, System.Drawing.Color.Blue, 1.0f, 0);
??? // Begin the scene
??? device.BeginScene();
???
??? // New for Tutorial 2
??? device.SetStreamSource(0, vertexBuffer, 0);??? //設(shè)置stream源用vertexbuffer.
??? device.VertexFormat = CustomVertex.TransformedColored.Format;? //設(shè)置render格式
??? device.DrawPrimitives(PrimitiveType.TriangleList, 0, 1);?
???
??? // End the scene
??? device.EndScene();
??? device.Present();
}

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 2006-05-12 13:55 夢在天涯閱讀(962) 評論(0) 編輯收藏引用所屬分類: DirectX

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C++ Programmer's Cookbook

Managed Directx --rendering vertices (使用VertexBuffer 進(jìn)行render)

Read and Write VertexBuffer and IndexBuffer Data With GraphicsStreams

Read and Write VertexBuffer Data With Arrays

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