示例程序 该示例程序绘制了一个矩形和一个坦克模型，其中先绘制矩形，再绘制坦克模型，而且坦克模型在矩形的后面被遮挡住。如果按下"1"键，则禁用深度测试，这时坦克虽然被矩形遮挡住，但仍然被绘制出来了；如果按下"2"键，则启用深度测试，这时坦克模型被矩形遮挡住，没有绘制出来。
按下数字键"1"，禁用深度测试，被矩形部分遮住的坦克被绘制出来。
按下数字键"2"，启用深度测试，被矩形部分遮住的坦克没有被绘制出来。
源程序：
#include <d3dx9.h>
#pragma warning(disable : 4127)
#define CLASS_NAME "GameApp"
#define release_com(p) do { if(p) { (p)->Release(); (p) = NULL; } } while(0)
IDirect3D9* g_d3d;
IDirect3DDevice9* g_device;
ID3DXMesh* g_mesh;
D3DMATERIAL9* g_mesh_materials;
IDirect3DTexture9** g_mesh_textures;
DWORD g_num_materials;
IDirect3DVertexBuffer9* g_shutter_vb;
D3DXMATRIX g_mat_tank;
D3DXMATRIX g_mat_shutter;
struct sCustomVertex
{
float x, y, z;
DWORD color;
};
#define D3DFVF_CUSTOM_VERTEX (D3DFVF_XYZ | D3DFVF_DIFFUSE)
void setup_matrices()
{
// setup world matrix
D3DXMATRIX mat_world;
D3DXMatrixIdentity(&mat_world);
g_device->SetTransform(D3DTS_WORLD, &mat_world);
// setup view matrix
D3DXVECTOR3 eye(0.0f, 2.0f, -30.0f);
D3DXVECTOR3 at(0.0f, 2.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX mat_view;
D3DXMatrixLookAtLH(&mat_view, &eye, &at, &up);
g_device->SetTransform(D3DTS_VIEW, &mat_view);
// setup projection matrix
D3DXMATRIX mat_proj;
D3DXMatrixPerspectiveFovLH(&mat_proj, D3DX_PI/4, 1.0f, 1.0f, 500.0f);
g_device->SetTransform(D3DTS_PROJECTION, &mat_proj);
}
bool init_geometry()
{
ID3DXBuffer* material_buffer;
/*
D3DXLoadMeshFromXA(
LPCSTR pFilename,
DWORD Options,
LPDIRECT3DDEVICE9 pD3DDevice,
LPD3DXBUFFER *ppAdjacency,
LPD3DXBUFFER *ppMaterials,
LPD3DXBUFFER *ppEffectInstances,
DWORD *pNumMaterials,
LPD3DXMESH *ppMesh);
*/
if(FAILED(D3DXLoadMeshFromX("tank.x", D3DXMESH_SYSTEMMEM, g_device, NULL, &material_buffer, NULL,
&g_num_materials, &g_mesh)))
{
MessageBox(NULL, "Could not find tank.x", "ERROR", MB_OK);
return false;
}
D3DXMATERIAL* xmaterials = (D3DXMATERIAL*) material_buffer->GetBufferPointer();
g_mesh_materials = new D3DMATERIAL9[g_num_materials];
g_mesh_textures = new IDirect3DTexture9*[g_num_materials];
for(DWORD i = 0; i < g_num_materials; i++)
{
g_mesh_materials[i] = xmaterials[i].MatD3D;
// set ambient reflected coefficient, because .x file do not set it.
g_mesh_materials[i].Ambient = g_mesh_materials[i].Diffuse;
g_mesh_textures[i] = NULL;
if(xmaterials[i].pTextureFilename != NULL && strlen(xmaterials[i].pTextureFilename) > 0)
D3DXCreateTextureFromFile(g_device, xmaterials[i].pTextureFilename, &g_mesh_textures[i]);
}
material_buffer->Release();
// create shutter vertex buffer
sCustomVertex vertices[] =
{
{ -8, -2, -10.0f, 0xFFFFFF00},
{ -8, 6, -10.0f, 0xFFFFFF00},
{ 8, -2, -10.0f, 0xFFFFFF00},
{ 8, 6, -10.0f, 0xFFFFFF00}
};
g_device->CreateVertexBuffer(sizeof(vertices), 0, D3DFVF_CUSTOM_VERTEX, D3DPOOL_DEFAULT, &g_shutter_vb, NULL);
void* ptr;
g_shutter_vb->Lock(0, sizeof(vertices), &ptr, 0);
memcpy(ptr, vertices, sizeof(vertices));
g_shutter_vb->Unlock();
return true;
}
bool init_d3d(HWND hwnd)
{
g_d3d = Direct3DCreate9(D3D_SDK_VERSION);
if(g_d3d == NULL)
return false;
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory(&d3dpp, sizeof(d3dpp));
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
d3dpp.EnableAutoDepthStencil = TRUE;
d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
if(FAILED(g_d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hwnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp, &g_device)))
{
return false;
}
if(! init_geometry())
return false;
setup_matrices();
g_device->SetRenderState(D3DRS_ZENABLE, TRUE);
g_device->SetRenderState(D3DRS_ZFUNC, D3DCMP_LESS);
g_device->SetRenderState(D3DRS_ZWRITEENABLE, TRUE);
g_device->SetRenderState(D3DRS_AMBIENT, 0xFF00BB00);
// rotate tank
D3DXQUATERNION quat;
D3DXMATRIX mat_rotation;
D3DXMatrixIdentity(&g_mat_tank);
D3DXQuaternionRotationYawPitchRoll(&quat, D3DX_PI/4, -D3DX_PI/4, 0.0f);
D3DXMatrixRotationQuaternion(&mat_rotation, &quat);
D3DXMatrixMultiply(&g_mat_tank, &mat_rotation, &g_mat_tank);
D3DXMatrixIdentity(&g_mat_shutter);
return true;
}
void cleanup()
{
delete[] g_mesh_materials;
if(g_mesh_textures)
{
for(DWORD i = 0; i < g_num_materials; i++)
release_com(g_mesh_textures[i]);
delete[] g_mesh_textures;
}
release_com(g_mesh);
release_com(g_shutter_vb);
release_com(g_device);
release_com(g_d3d);
}
void render()
{
g_device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(5, 5, 5), 1.0f, 0);
g_device->BeginScene();
// render shutter
g_device->SetRenderState(D3DRS_LIGHTING, FALSE);
g_device->SetTransform(D3DTS_WORLD, &g_mat_shutter);
g_device->SetStreamSource(0, g_shutter_vb, 0, sizeof(sCustomVertex));
g_device->SetFVF(D3DFVF_CUSTOM_VERTEX);
g_device->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
// render tank
g_device->SetRenderState(D3DRS_LIGHTING, TRUE);
g_device->SetTransform(D3DTS_WORLD, &g_mat_tank);
for(DWORD i = 0; i < g_num_materials; i++)
{
g_device->SetMaterial(&g_mesh_materials[i]);
g_device->SetTexture(0, g_mesh_textures[i]);
g_mesh->DrawSubset(i);
}
g_device->EndScene();
g_device->Present(NULL, NULL, NULL, NULL);
}
LRESULT WINAPI WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_KEYDOWN:
switch(wParam)
{
case 49: // press key "1", disable depth test.
g_device->SetRenderState(D3DRS_ZENABLE, FALSE);
break;
case 50: // press key "2", enable depth test.
g_device->SetRenderState(D3DRS_ZENABLE, TRUE);
break;
case VK_ESCAPE:
DestroyWindow(hwnd);
break;
}
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE inst, HINSTANCE, LPSTR, INT)
{
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_CLASSDC;
wc.lpfnWndProc = WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = inst;
wc.hIcon = NULL;
wc.hCursor = NULL;
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = CLASS_NAME;
wc.hIconSm = NULL;
if(! RegisterClassEx(&wc))
return -1;
HWND hwnd = CreateWindow(CLASS_NAME, "Direct3D App", WS_OVERLAPPEDWINDOW, 200, 100, 640, 480,
NULL, NULL, wc.hInstance, NULL);
if(hwnd == NULL)
return -1;
if(init_d3d(hwnd))
{
ShowWindow(hwnd, SW_SHOWDEFAULT);
UpdateWindow(hwnd);
MSG msg;
ZeroMemory(&msg, sizeof(msg));
while(msg.message != WM_QUIT)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
render();
}
}
cleanup();
UnregisterClass(CLASS_NAME, wc.hInstance);
return 0;
}
[B][URL=http://www.cppblog.com/Files/changingnow/ZTest.rar]下载示例工程[/URL][/B]
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2009/3/9 9:56:00
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深度测试与alpha混合
