6. D3DXMatrixOrthoLH +正交投影矩阵

#include<d3d9.h>
#include
<d3dx9.h>

#pragma comment(lib, "d3d9.lib")
#pragma comment(lib, "d3dx9.lib")

#define WINDOW_CLASS "UGPDX"
#define WINDOW_NAME "Ortho Projection Matrix"
#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480

// Function Prototypes...
bool InitializeD3D(HWND hWnd, bool fullscreen);
bool InitializeObjects();
void RenderScene();
void Shutdown();


// Direct3D object and device.
LPDIRECT3D9 g_D3D = NULL;
LPDIRECT3DDEVICE9 g_D3DDevice
= NULL;
D3DXMATRIX g_ortho;

// Vertex buffer to hold the geometry.
LPDIRECT3DVERTEXBUFFER9 g_VertexBuffer = NULL;

// A structure for our custom vertex type
struct stD3DVertex
{
float x, y, z;
unsigned
long color;
};

// Our custom FVF, which describes our custom vertex structure
#define D3DFVF_VERTEX (D3DFVF_XYZ | D3DFVF_DIFFUSE)


LRESULT WINAPI MsgProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_DESTROY:
PostQuitMessage(
0);
return 0;
break;

case WM_KEYUP:
if(wParam == VK_ESCAPE) PostQuitMessage(0);
break;
}

return DefWindowProc(hWnd, msg, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hInst, HINSTANCE prevhInst, LPSTR cmdLine, int show)
{
// Register the window class
WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
WINDOW_CLASS, NULL };
RegisterClassEx(
&wc);

// Create the application's window
HWND hWnd = CreateWindow(WINDOW_CLASS, WINDOW_NAME, WS_OVERLAPPEDWINDOW,
100, 100, WINDOW_WIDTH, WINDOW_HEIGHT, GetDesktopWindow(),
NULL, wc.hInstance, NULL);

// Initialize Direct3D
if(InitializeD3D(hWnd, false))
{
// Show the window
ShowWindow(hWnd, SW_SHOWDEFAULT);
UpdateWindow(hWnd);

// Enter the message loop
MSG msg;
ZeroMemory(
&msg, sizeof(msg));

while(msg.message != WM_QUIT)
{
if(PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
{
TranslateMessage(
&msg);
DispatchMessage(
&msg);
}
else
RenderScene();
}
}

// Release any and all resources.
Shutdown();

// Unregister our window.
UnregisterClass(WINDOW_CLASS, wc.hInstance);
return 0;
}


bool InitializeD3D(HWND hWnd, bool fullscreen)
{
D3DDISPLAYMODE displayMode;

// Create the D3D object.
g_D3D = Direct3DCreate9(D3D_SDK_VERSION);
if(g_D3D == NULL) return false;

// Get the desktop display mode.
if(FAILED(g_D3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &displayMode)))
return false;

// Set up the structure used to create the D3DDevice
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory(
&d3dpp, sizeof(d3dpp));

if(fullscreen)
{
d3dpp.Windowed
= FALSE;
d3dpp.BackBufferWidth
= WINDOW_WIDTH;
d3dpp.BackBufferHeight
= WINDOW_HEIGHT;
}
else
d3dpp.Windowed
= TRUE;
d3dpp.SwapEffect
= D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat
= displayMode.Format;

// Create the D3DDevice
if(FAILED(g_D3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_D3DDevice)))
{
return false;
}

// Initialize any objects we will be displaying.
if(!InitializeObjects()) return false;

return true;
}


bool InitializeObjects()
{
// 生成正交投影矩阵
//正交投影中,投影向量和观察平面垂直,物体坐标沿观察坐标系的z轴平行投影到观察平面上,
//观察点和观察平面间的距离不会影响物体的投影大小
//对于正交投影来说,它的取景范围是一个长方体,只有在这个长方体中的景物才会被绘制出来。
// Set the projection matrix.
D3DXMatrixOrthoLH(&g_ortho, WINDOW_WIDTH, WINDOW_HEIGHT, 0.1f, 1000.0f);
g_D3DDevice
->SetTransform(D3DTS_PROJECTION, &g_ortho);

// Set default rendering states.
g_D3DDevice->SetRenderState(D3DRS_LIGHTING, FALSE);

//代表是否绘制三角形的反面。
// D3DCULL_MODE是背面隐藏消除的意思.
//SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE )则正反面都绘制。
//SetRenderState( D3DRS_CULLMODE, D3DCULL_CW ); //绘制顺时针三角形。
//SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW )绘制逆时针三角形。
g_D3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);

// Fill in our structure to draw an object.
// x, y, z, color.
stD3DVertex objData[] =
{
{
-150.0f, -150.0f, 0.1f, D3DCOLOR_XRGB(255,0,0)},
{
150.0f, -150.0f, 0.1f, D3DCOLOR_XRGB(0,255,0)},
{
0.0f, 150.0f, 0.1f, D3DCOLOR_XRGB(0,0,255)}
};

// Create the vertex buffer.
if(FAILED(g_D3DDevice->CreateVertexBuffer(3 * sizeof(stD3DVertex), 0,
D3DFVF_VERTEX, D3DPOOL_DEFAULT,
&g_VertexBuffer, NULL))) return false;

// Fill the vertex buffer.
void *ptr;
if(FAILED(g_VertexBuffer->Lock(0, sizeof(objData), (void**)&ptr, 0))) return false;
memcpy(ptr, objData,
sizeof(objData));
g_VertexBuffer
->Unlock();

return true;
}


void RenderScene()
{
// Clear the backbuffer.
g_D3DDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0);

// Begin the scene. Start rendering.
g_D3DDevice->BeginScene();

// Bind data to the stream, set fvf so D3D knows how our data
// is made up, then render the object.
g_D3DDevice->SetStreamSource(0, g_VertexBuffer, 0, sizeof(stD3DVertex));
g_D3DDevice
->SetFVF(D3DFVF_VERTEX);
g_D3DDevice
->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);

// End the scene. Stop rendering.
g_D3DDevice->EndScene();

// Display the scene.
g_D3DDevice->Present(NULL, NULL, NULL, NULL);
}


void Shutdown()
{
if(g_D3DDevice != NULL) g_D3DDevice->Release();
if(g_D3D != NULL) g_D3D->Release();
if(g_VertexBuffer != NULL) g_VertexBuffer->Release();
}

  


posted @ 2011-08-19 14:25  小 楼 一 夜 听 春 雨  阅读(2713)  评论(0编辑  收藏  举报