So I think its better if I keep my text short as I have included a video that will explain most of what I have been up to lately. I feel that I am actually making some progress with DirectX (finally) as it is very complex. The neat thing, once you watch the video, is that these principles can be applied to more complex structures and matrix-es. The triangle in the video is simple. I will soon be able to import other objects and then map out keystrokes to camera movement which then would basically emulate player movement. Anyways any questions? Ask away, I’ll try my best.
Oh, I will also include the source code for this, so if you want to fool around with it also. Go right ahead, take it.
Sorry for the terrible quality. I know you can’t really see anything… this is because vimeo only allows me to upload one HD video per week… sadly I did one right before this one. So… This is what I am stuck with. If you really want to see the video goto the video on vimeo website is there is a HD download version you’ll just have to download it… It’s not big. Probably like 25 megs or so. Anyways, my apologies.
// include the basic windows header files and the Direct3D header file
#include <windows.h>
#include <windowsx.h>
#include <d3d9.h>
#include <d3dx9.h>
// define the screen resolution
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 600
// include the Direct3D Library files
#pragma comment (lib, “d3d9.lib”)
#pragma comment (lib, “d3dx9.lib”)
// global declarations
LPDIRECT3D9 d3d; // the pointer to Direct3D interface
LPDIRECT3DDEVICE9 d3ddev; // the pointer to the device class
LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL; // the pointer to the vertex buffer
// function prototypes
void initD3D(HWND hWnd); // sets up and initializes Direct3D
void render_frame(void); // renders a single frame
void cleanD3D(void); // closes Direct3D and releases memory
void init_graphics(void); // 3D declarations
struct CUSTOMVERTEX {FLOAT X, Y, Z; DWORD COLOR;};
#define CUSTOMFVF (D3DFVF_XYZ | D3DFVF_DIFFUSE)
// the WindowProc function prototype
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
// the entry point for any Windows program
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HWND hWnd;
WNDCLASSEX wc;
ZeroMemory(&wc, sizeof(WNDCLASSEX));
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.lpszClassName = L”WindowClass”;
RegisterClassEx(&wc);
hWnd = CreateWindowEx(NULL, L”WindowClass”, L”Spinning Triangle YAAAAHHHH”,
WS_OVERLAPPEDWINDOW, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
NULL, NULL, hInstance, NULL);
ShowWindow(hWnd, nCmdShow);
// set up and initialize Direct3D
initD3D(hWnd);
// enter the main loop:
MSG msg;
while(TRUE)
{
while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
if(msg.message == WM_QUIT)
break;
render_frame();
}
// clean up DirectX and COM
cleanD3D();
return msg.wParam;
}
// this is the main message handler for the program
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_DESTROY:
{
PostQuitMessage(0);
return 0;
} break;
}
return DefWindowProc (hWnd, message, wParam, lParam);
}
// this function initializes and prepares Direct3D for use
void initD3D(HWND hWnd)
{
d3d = Direct3DCreate9(D3D_SDK_VERSION);
D3DPRESENT_PARAMETERS d3dpp;
ZeroMemory(&d3dpp, sizeof(d3dpp));
d3dpp.Windowed = TRUE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow = hWnd;
d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
d3dpp.BackBufferWidth = SCREEN_WIDTH;
d3dpp.BackBufferHeight = SCREEN_HEIGHT;
// create a device class using this information and the info from the d3dpp stuct
d3d->CreateDevice(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL,
hWnd,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp,
&d3ddev);
init_graphics(); // call the function to initialize the triangle
d3ddev->SetRenderState(D3DRS_LIGHTING, FALSE); // turn off the 3D lighting
d3ddev->SetRenderState(D3DRS_CULLMODE, TRUE); // render both sides of the Triangle
}
// this is the function used to render a single frame
void render_frame(void)
{
int R = 0;
int G = 0;
int B = 0;
int xColor = 255;
for ( xColor; xColor <= 255; xColor–)
{
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(R, G, B), 1.0f, 0);
d3ddev->BeginScene();
// select which vertex format we are using
d3ddev->SetFVF(CUSTOMFVF);
// SET UP THE PIPELINE
//D3DXMATRIX matRotateX; // a matrix Pointers to store the rotation information
//D3DXMATRIX matTranslate;
D3DXMATRIX matRotateY;
//D3DXMATRIX matRotateZ;
static float index = 0.0f; index+=0.05f; // an increasing float value
static float zoom = 45.0; zoom-=0.05f;
// build a matrix to rotate the model based on the increasing float value
//D3DXMatrixRotationX(&matRotateX, D3DXToRadian(-90));
D3DXMatrixRotationY(&matRotateY, index);
//D3DXMatrixTranslation(&matTranslate,0.0f, index, 0.0f);
//D3DXMatrixRotationZ(&matRotateZ, index);
// tell Direct3D about our matrix
d3ddev->SetTransform(D3DTS_WORLD, &matRotateY);
D3DXMATRIX matView; // the view transform matrix
D3DXMatrixLookAtLH(&matView,
&D3DXVECTOR3 (0.0f, 0.0f, 20.0f), // the camera position
&D3DXVECTOR3 (0.0f, 0.0f, 0.0f), // the look-at position
&D3DXVECTOR3 (0.0f, 1.0f, 0.0f)); // the up direction
d3ddev->SetTransform(D3DTS_VIEW, &matView); // set the view transform to matView
D3DXMATRIX matProjection; // the projection transform matrix
D3DXMatrixPerspectiveFovLH(&matProjection,
D3DXToRadian(zoom), // the horizontal field of view
(FLOAT)SCREEN_WIDTH / (FLOAT)SCREEN_HEIGHT, // aspect ratio
1.0f, // the near view-plane
200.0f); // the far view-plane
d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection); // set the projection
// select the vertex buffer to display
d3ddev->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));
// copy the vertex buffer to the back buffer
d3ddev->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 1);
d3ddev->EndScene();
d3ddev->Present(NULL, NULL, NULL, NULL);
R++;
}
}
// this is the function that cleans up Direct3D and COM
void cleanD3D(void)
{
v_buffer->Release(); // close and release the vertex buffer
d3ddev->Release(); // close and release the 3D device
d3d->Release(); // close and release Direct3D
}
// this is the function that puts the 3D models into video RAM
void init_graphics(void)
{
// create the vertices using the CUSTOMVERTEX struct
CUSTOMVERTEX vertices[] =
{
{ 3.0f, -3.0f, 0.0f, D3DCOLOR_XRGB(0, 0, 255), },
{ 0.0f, 3.0f, 0.0f, D3DCOLOR_XRGB(0, 255, 0), },
{ -3.0f, -3.0f, 0.0f, D3DCOLOR_XRGB(255, 0, 0), },
};
// create a vertex buffer interface called v_buffer
d3ddev->CreateVertexBuffer(3*sizeof(CUSTOMVERTEX),
0,
CUSTOMFVF,
D3DPOOL_MANAGED,
&v_buffer,
NULL);
VOID* pVoid; // a void pointer
// lock v_buffer and load the vertices into it
v_buffer->Lock(0, 0, (void**)&pVoid, 0);
memcpy(pVoid, vertices, sizeof(vertices));
v_buffer->Unlock();
}
Dopamine Studios 