我们通过调用D3DXCreateSprite来完成ID3DXSprite接口对象的创建，同时使用介于Begin与End之间的Draw方法来完成D3D中2D元素的绘制。
下面，我们对IDirect3DTexture9和ID3DXSprite进行二次封装，使其接口趋于人性化，使用起来更加便捷：
/*------------------------------------- 代码清单：Texture2D.h 来自：http://www.cnblogs.com/kenkao -------------------------------------*/ #include "D3DInit.h" #pragma _disibledevent=> class CTexture2D { public: CTexture2D(void); ~CTexture2D(void); public: void LoadTexture( //纹理加载 char* szFxFileName, //文件路径 UINT SizeX = D3DX_DEFAULT_NONPOW2, //X默认非2次幂尺寸 UINT SizeY = D3DX_DEFAULT_NONPOW2 //Y默认非2次幂尺寸 ); void Release() {ReleaseCOM(m_pTexture);} //释放纹理 public: UINT GetWidth() {return m_Width;} //获得纹理宽 UINT GetHight() {return m_Height;} //获得纹理高 RECT GetRect() {return m_SurRect;} //获得纹理尺寸 IDirect3DTexture9* GetTexture() {return m_pTexture;} //获得纹理指针 D3DXIMAGE_INFO GetTextureInfo() {return m_TextureInfo;} //获得纹理信息 private: IDirect3DTexture9* m_pTexture; //纹理指针 D3DXIMAGE_INFO m_TextureInfo; //纹理信息 RECT m_SurRect; //纹理尺寸 UINT m_Width; //纹理宽 UINT m_Height; //纹理高 };
/*------------------------------------- 代码清单：Texture2D.cpp 来自：http://www.cnblogs.com/kenkao -------------------------------------*/ #include "StdAfx.h" #include "Texture2D.h" #include "D3DGame.h" extern IDirect3DDevice9* g_pD3DDevice; CTexture2D::CTexture2D(void):m_pTexture(NULL) { } CTexture2D::~CTexture2D(void) { } void CTexture2D::LoadTexture(char* szFxFileName, UINT SizeX, UINT SizeY) { D3DXCreateTextureFromFileEx( g_pD3DDevice, szFxFileName, SizeX, SizeY, D3DX_FROM_FILE, D3DPOOL_DEFAULT, D3DFMT_FROM_FILE, D3DPOOL_MANAGED, D3DX_DEFAULT, D3DX_DEFAULT, D3DCOLOR_COLORVALUE(0.0f,0.0f,0.0f,1.0f), &m_TextureInfo, NULL, &m_pTexture); if(SizeX==(UINT)-2) m_Width = m_TextureInfo.Width; else m_Width = SizeX; if(SizeY==(UINT)-2) m_Height = m_TextureInfo.Height; else m_Height = SizeY; m_SurRect.top = 0; m_SurRect.left = 0; m_SurRect.right = m_Width; m_SurRect.bottom = m_Height; }
我们依然通过调用D3DXCreateTextureFromFileEx函数从特定的Img文件产生纹理，只不过这次通过传入特定的参数使其产生专门用于2D绘制的纹理。
大家可以看到LoadTexture中的SizeX，SizeY我给定了默认值D3DX_DEFAULT_NONPOW2，意在使所获得的纹理默认支持非二次幂尺寸；而两个值如果默认为0的话，纹理尺寸会被自动拉伸到最相近的二次幂值，这不是我们所期待的结果。
加载完毕的纹理必要信息，会被存放到一个D3DXIMAGE_INFO类型的结构体中，其定义可以参看SDK，很好理解~
/*------------------------------------- 代码清单：D3DSprite.h 来自：http://www.cnblogs.com/kenkao -------------------------------------*/ #include "Texture2D.h" #pragma _disibledevent=> class CD3DSprite { public: CD3DSprite(IDirect3DDevice9* pDevice); ~CD3DSprite(void); public: void Begin(DWORD Flags); // 开启Sprite绘制 void End(); // 结束Sprite绘制 void Draw( // 绘制Sprite CTexture2D* pTexture, // 2D纹理 const POINT& Position, // 位置 D3DCOLOR Color // 色相 ); void Draw( CTexture2D* pTexture, const POINT& Position, const RECT& SurRect, // 指定绘制纹理区域 D3DCOLOR Color ); void Draw( CTexture2D* pTexture, const POINT& Pos, const D3DXMATRIX& TransMatrix, // 变换矩阵 const RECT& SurRect, D3DCOLOR Color ); void Draw( CTexture2D* pTexture, const POINT& Pos, const POINT& Size, // 绘制尺寸 const RECT& SurRect, D3DCOLOR Color ); void Draw( CTexture2D* pTexture, const RECT& DesRect, // 指定绘制目标区域 const RECT& SurRect, D3DCOLOR Color ); void Draw( CTexture2D* pTexture, const RECT& DesRect, D3DCOLOR Color ); void Release(){ReleaseCOM(m_pSprite)}; // 释放Sprite public: ID3DXSprite* GetSprite(){return m_pSprite;} // 获得Sprite指针 private: ID3DXSprite* m_pSprite; // Sprite指针 D3DXMATRIX m_orgMatrix; // 原始矩阵 };
/*------------------------------------- 代码清单：D3DSprite.cpp 来自：http://www.cnblogs.com/kenkao -------------------------------------*/ #include "StdAfx.h" #include "D3DSprite.h" CD3DSprite::CD3DSprite(IDirect3DDevice9* pDevice) { D3DXCreateSprite(pDevice, &m_pSprite); D3DXMatrixTranslation(&m_orgMatrix,1.0f,1.0f,0.0f); } CD3DSprite::~CD3DSprite(void) { } void CD3DSprite::Begin(DWORD Flags) { m_pSprite->Begin(Flags); } void CD3DSprite::End() { m_pSprite->End(); } void CD3DSprite::Draw(CTexture2D* pTexture, const POINT& Pos, D3DCOLOR Color) { Draw(pTexture,Pos,pTexture->GetRect(),Color); } void CD3DSprite::Draw(CTexture2D* pTexture, const POINT& Pos, const RECT& SurRect, D3DCOLOR Color) { m_pSprite->Draw(pTexture->GetTexture(),&SurRect,&D3DXVECTOR3(0.0f,0.0f,0.0f),&D3DXVECTOR3(Pos.x,Pos.y,0.0f),Color); } void CD3DSprite::Draw(CTexture2D* pTexture, const POINT& Pos, const D3DXMATRIX& TransMatrix, const RECT& SurRect, D3DCOLOR Color) { // 设置缩放矩阵 m_pSprite->SetTransform(&TransMatrix); Draw(pTexture,Pos,SurRect,Color); // 还原缩放矩阵 m_pSprite->SetTransform(&m_orgMatrix); } void CD3DSprite::Draw(CTexture2D* pTexture, const POINT& Pos, const POINT& Size, const RECT& SurRect, D3DCOLOR Color) { D3DXMATRIX TransMatrix; FLOAT ScalX, ScalY; ScalX = (FLOAT)Size.x/(FLOAT)(SurRect.right-SurRect.left); ScalY = (FLOAT)Size.y/(FLOAT)(SurRect.bottom-SurRect.top); D3DXMatrixScaling(&TransMatrix,ScalX,ScalY,0.0f); Draw(pTexture,Pos,TransMatrix,SurRect,Color); } void CD3DSprite::Draw(CTexture2D* pTexture, const RECT& DesRect, const RECT& SurRect, D3DCOLOR Color) { POINT Pos; Pos.x = DesRect.left; Pos.y = DesRect.top; POINT Size; Size.x = DesRect.right - DesRect.left; Size.y = DesRect.bottom - DesRect.top; Draw(pTexture, Pos, Size, SurRect, Color); } void CD3DSprite::Draw(CTexture2D* pTexture, const RECT& DesRect, D3DCOLOR Color) { Draw(pTexture,DesRect,pTexture->GetRect(),Color); }
我们的CD3DSprite在原有ID3DXSprite基础上所做的主要工作是提供了大量的重载Draw函数，以更加人性化的参数设计提供更加便捷的函数调用。
这里值得一提的是
m_pSprite->SetTransform(&TransMatrix);
方法的调用。所传入参数就目前测试来看，只可以是缩放矩阵，平移与旋转矩阵被认定是非法的。ID3DXSprite接口对象就是通过这种方式来完成2D图像的缩放工作的。(感谢CSDN游戏开发论坛一位大侠的提点 ^ ^)
D3DGame.cpp /*------------------------------------- 代码清单：D3DGame.cpp
来自：http://www.cnblogs.com/kenkao -------------------------------------*/ #include "StdAfx.h"
#include "D3DGame.h"
#include "D3DCamera.h"
#include "D3DEffect.h"
#include "CoordCross.h"
#include "SimpleXMesh.h"
#include "Texture2D.h"
#include "D3DSprite.h"
#include 效果图：
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