2014/09/25
(转载自:http://blog.csdn.net/pizi0475/article/details/6268240)
原文出处:
http://www.cppblog.com/lovedday/archive/2007/07/02/27379.html
思路与一个用D3D绘制2D图形的例子相差不多,主要的区别在顶点的数据结构定义不一样。
2D的VERTEX结构定义为:
//
The 2D vertex format and descriptor
typedef
struct
{
float x, y, z;
//
2D coordinates
float rhw;
//
rhw
float u, v;
//
texture coordinates
} VERTEX;
#define VERTEX_FVF (D3DFVF_XYZRHW | D3DFVF_TEX1)
3D的VERTEX结构定义为:
//
The 3D vertex format and descriptor
typedef
struct
{
float x, y, z;
//
3D coordinates
float u, v;
//
texture coordinates
} VERTEX;
#define VERTEX_FVF (D3DFVF_XYZ | D3DFVF_TEX1)
其他的区别主要在Do_Init函数,3D模式启用深度蒙板,并且格式为16位z-缓存位深;接着禁用光照,并且启用z缓存;再接着设置透视矩阵和视口矩阵。
present_param.EnableAutoDepthStencil = TRUE;
present_param.AutoDepthStencilFormat = D3DFMT_D16;
//
set render state
//
disable d3d lighting
g_d3d_device->SetRenderState(D3DRS_LIGHTING, FALSE);
//
enable z-buffer
g_d3d_device->SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE);
//
create and set the projection matrix
//
builds a left-handed perspective projection matrix based on a field of view
D3DXMatrixPerspectiveFovLH(&mat_proj, D3DX_PI/4.0, 1.33333, 1.0, 1000.0);
//
sets a single device transformation-related state
g_d3d_device->SetTransform(D3DTS_PROJECTION, &mat_proj);
//
create and set the view matrix
D3DXMatrixLookAtLH(&mat_view,
&D3DXVECTOR3(0.0, 0.0, -500.0),
&D3DXVECTOR3(0.0f, 0.0f, 0.0f),
&D3DXVECTOR3(0.0f, 1.0f, 0.0f));
g_d3d_device->SetTransform(D3DTS_VIEW, &mat_view);
函数Do_Frame也有一些区别,调用Clear来清除后备缓冲时增加了一个D3DCLEAR_ZBUFFER提示D3D要清除z 缓存,接着设置世界矩阵。
//
clear device back buffer
g_d3d_device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_RGBA(0, 64, 128, 255), 1.0f, 0);
//
create and set the world transformation matrix
//
rotate object along z-axis
D3DXMatrixRotationZ(&mat_world, (
float) (timeGetTime() / 1000.0));
g_d3d_device->SetTransform(D3DTS_WORLD, &mat_world);
完整源码如下:
/*
**************************************************************************************
PURPOSE:
3D Drawing Demo
Required libraries:
WINMM.LIB, D3D9.LIB, D3DX9.LIB.
**************************************************************************************
*/
#include <windows.h>
#include <stdio.h>
#include "d3d9.h"
#include "d3dx9.h"
#pragma comment(lib, "winmm.lib")
#pragma comment(lib, "d3d9.lib")
#pragma comment(lib, "d3dx9.lib")
#pragma warning(disable : 4305)
#define WINDOW_WIDTH 400
#define WINDOW_HEIGHT 400
#define Safe_Release(p) if((p)) (p)->Release();
//
window handles, class and caption text.
HWND g_hwnd;
HINSTANCE g_inst;
static
char g_class_name[] = "Draw3DClass";
static
char g_caption[] = "Draw3D Demo";
//
the Direct3D and device object
IDirect3D9* g_d3d = NULL;
IDirect3DDevice9* g_d3d_device = NULL;
//
The 3D vertex format and descriptor
typedef
struct
{
float x, y, z;
//
3D coordinates
float u, v;
//
texture coordinates
} VERTEX;
#define VERTEX_FVF (D3DFVF_XYZ | D3DFVF_TEX1)
IDirect3DVertexBuffer9* g_vertex_buffer = NULL;
IDirect3DTexture9* g_texture = NULL;
//
--------------------------------------------------------------------------------
//
Window procedure.
//
--------------------------------------------------------------------------------
long WINAPI Window_Proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return (
long) DefWindowProc(hwnd, msg, wParam, lParam);
}
//
--------------------------------------------------------------------------------
//
Initialize d3d, d3d device, vertex buffer, texutre; set render state for d3d;
//
set perspective matrix and view matrix.
//
--------------------------------------------------------------------------------
BOOL Do_Init()
{
D3DPRESENT_PARAMETERS present_param;
D3DDISPLAYMODE display_mode;
D3DXMATRIX mat_proj, mat_view;
BYTE* vertex_ptr;
//
initialize vertex data
VERTEX verts[] = {
{ -100.0f, 100.0f, 0.0f, 0.0f, 0.0f },
{ 100.0f, 100.0f, 0.0f, 1.0f, 0.0f },
{ -100.0f, -100.0f, 0.0f, 0.0f, 1.0f },
{ 100.0f, -100.0f, 0.0f, 1.0f, 1.0f }
};
//
do a windowed mode initialization of Direct3D
if((g_d3d = Direct3DCreate9(D3D_SDK_VERSION)) == NULL)
return FALSE;
//
retrieves the current display mode of the adapter
if(FAILED(g_d3d->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &display_mode)))
return FALSE;
ZeroMemory(&present_param,
sizeof(present_param));
//
initialize d3d presentation parameter
present_param.Windowed = TRUE;
present_param.SwapEffect = D3DSWAPEFFECT_DISCARD;
present_param.BackBufferFormat = display_mode.Format;
present_param.EnableAutoDepthStencil = TRUE;
present_param.AutoDepthStencilFormat = D3DFMT_D16;
//
creates a device to represent the display adapter
if(FAILED(g_d3d->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, g_hwnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING, &present_param, &g_d3d_device)))
return FALSE;
//
set render state
//
disable d3d lighting
g_d3d_device->SetRenderState(D3DRS_LIGHTING, FALSE);
//
enable z-buffer
g_d3d_device->SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE);
//
create and set the projection matrix
//
builds a left-handed perspective projection matrix based on a field of view
D3DXMatrixPerspectiveFovLH(&mat_proj, D3DX_PI/4.0, 1.33333, 1.0, 1000.0);
//
sets a single device transformation-related state
g_d3d_device->SetTransform(D3DTS_PROJECTION, &mat_proj);
//
create and set the view matrix
D3DXMatrixLookAtLH(&mat_view,
&D3DXVECTOR3(0.0, 0.0, -500.0),
&D3DXVECTOR3(0.0f, 0.0f, 0.0f),
&D3DXVECTOR3(0.0f, 1.0f, 0.0f));
g_d3d_device->SetTransform(D3DTS_VIEW, &mat_view);
//
create the vertex buffer and set data
g_d3d_device->CreateVertexBuffer(
sizeof(VERTEX) * 4, 0, VERTEX_FVF, D3DPOOL_DEFAULT, &g_vertex_buffer, NULL);
//
locks a range of vertex data and obtains a pointer to the vertex buffer memory
g_vertex_buffer->Lock(0, 0, (
void**)&vertex_ptr, 0);
memcpy(vertex_ptr, verts,
sizeof(verts));
//
unlocks vertex data
g_vertex_buffer->Unlock();
//
load the texture map
D3DXCreateTextureFromFile(g_d3d_device, "Texture.bmp", &g_texture);
return TRUE;
}
//
--------------------------------------------------------------------------------
//
Release all d3d resource.
//
--------------------------------------------------------------------------------
BOOL Do_Shutdown()
{
Safe_Release(g_vertex_buffer);
Safe_Release(g_texture);
Safe_Release(g_d3d_device);
Safe_Release(g_d3d);
return TRUE;
}
//
--------------------------------------------------------------------------------
//
Render a frame.
//
--------------------------------------------------------------------------------
BOOL Do_Frame()
{
D3DXMATRIX mat_world;
//
clear device back buffer
g_d3d_device->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_RGBA(0, 64, 128, 255), 1.0f, 0);
//
Begin scene
if(SUCCEEDED(g_d3d_device->BeginScene()))
{
//
create and set the world transformation matrix
//
rotate object along z-axis
D3DXMatrixRotationZ(&mat_world, (
float) (timeGetTime() / 1000.0));
g_d3d_device->SetTransform(D3DTS_WORLD, &mat_world);
//
set the vertex stream, shader, and texture.
//
binds a vertex buffer to a device data stream
g_d3d_device->SetStreamSource(0, g_vertex_buffer, 0,
sizeof(VERTEX));
//
set the current vertex stream declation
g_d3d_device->SetFVF(VERTEX_FVF);
//
assigns a texture to a stage for a device
g_d3d_device->SetTexture(0, g_texture);
//
renders a sequence of noindexed, geometric primitives of the specified type from the current set
//
of data input stream.
g_d3d_device->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
//
release texture
g_d3d_device->SetTexture(0, NULL);
//
end the scene
g_d3d_device->EndScene();
}
//
present the contents of the next buffer in the sequence of back buffers owned by the device
g_d3d_device->Present(NULL, NULL, NULL, NULL);
return TRUE;
}
//
--------------------------------------------------------------------------------
//
Main function, routine entry.
//
--------------------------------------------------------------------------------
int WINAPI WinMain(HINSTANCE inst, HINSTANCE, LPSTR cmd_line,
int cmd_show)
{
WNDCLASSEX win_class;
MSG msg;
g_inst = inst;
//
create window class and register it
win_class.cbSize =
sizeof(win_class);
win_class.style = CS_CLASSDC;
win_class.lpfnWndProc = Window_Proc;
win_class.cbClsExtra = 0;
win_class.cbWndExtra = 0;
win_class.hInstance = inst;
win_class.hIcon = LoadIcon(NULL, IDI_APPLICATION);
win_class.hCursor = LoadCursor(NULL, IDC_ARROW);
win_class.hbrBackground = NULL;
win_class.lpszMenuName = NULL;
win_class.lpszClassName = g_class_name;
win_class.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(! RegisterClassEx(&win_class))
return FALSE;
//
create the main window
g_hwnd = CreateWindow(g_class_name, g_caption, WS_CAPTION | WS_SYSMENU, 0, 0,
WINDOW_WIDTH, WINDOW_HEIGHT, NULL, NULL, inst, NULL);
if(g_hwnd == NULL)
return FALSE;
ShowWindow(g_hwnd, SW_NORMAL);
UpdateWindow(g_hwnd);
//
initialize game
if(Do_Init() == FALSE)
return FALSE;
//
start message pump, waiting for signal to quit.
ZeroMemory(&msg,
sizeof(MSG));
while(msg.message != WM_QUIT)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
//
draw a frame
if(Do_Frame() == FALSE)
break;
}
//
run shutdown function
Do_Shutdown();
UnregisterClass(g_class_name, inst);
return (
int) msg.wParam;
}
效果(图象绕z轴旋转):