I'm trying to draw some 2D images in Microsoft Visual Studio 2005 c++ using DirectX. So far I'm doing ok, but I cant quite make the pixels on the images as clear as they are in the actual image files. I would like them to be the same pixel per pixel.
I've been trying 2 different methods, one using the 3D environment and using a setup to look at the image as if it was on a 2D screen.
And another where I just use absolute screen positioning.
Both methods blur the images a little.
Here is a picture showing what I get. I want it to look like the bottom line.
http://img207.imageshack.us/img207/8553/44157057.png
Here is the code I'm using
Code:// test.cpp : Defines the entry point for the application.
//
#include "stdafx.h"
#include "test.h"
// 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 our Direct3D interface
LPDIRECT3DDEVICE9 d3ddev; // the pointer to the device class
LPDIRECT3DVERTEXBUFFER9 v_buffer = NULL; // the pointer to the vertex buffer
LPDIRECT3DVERTEXBUFFER9 v_buffer2 = NULL; // the pointer to the vertex buffer
LPDIRECT3DTEXTURE9 g_pTexture = NULL; // Our texture
// 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
//3D VERTEX STRUCT
struct CUSTOMVERTEX {FLOAT X, Y, Z, tu, tv; DWORD COLOR;};
#define CUSTOMFVF (D3DFVF_XYZ | D3DFVF_TEX1)
//ABSOLUTE VERTEX STRUCT
struct CUSTOMFLATVERTEX {FLOAT X, Y, Z, rhw, tu, tv ; DWORD COLOR;};
#define CUSTOMFLATFVF (D3DFVF_XYZRHW | D3DFVF_TEX1)
// 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"Our Direct3D Program",
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_A8R8G8B8;
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_HARDWARE_VERTEXPROCESSING,//D3DCREATE_SOFTWARE_VERTEXPROCESSING, D3DCREATE_MIXED_VERTEXPROCESSING
&d3dpp,
&d3ddev);
// Turn off culling
d3ddev->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );
// Turn off D3D lighting
d3ddev->SetRenderState( D3DRS_LIGHTING, FALSE );
// Turn off the zbuffer
d3ddev->SetRenderState(D3DRS_ZENABLE,D3DZB_FALSE);
//alpha blending enabled
d3ddev->SetRenderState(D3DRS_ALPHABLENDENABLE,TRUE);
//source blend factor
d3ddev->SetRenderState(D3DRS_SRCBLEND,D3DBLEND_SRCALPHA);
//no looping texture
d3ddev->SetSamplerState(0,D3DSAMP_ADDRESSU,D3DTADDRESS_CLAMP);
d3ddev->SetSamplerState(0,D3DSAMP_ADDRESSV,D3DTADDRESS_CLAMP);
init_graphics(); // call the function to initialize the triangle
}
// this is the function used to render a single frame
void render_frame(void)
{
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);
d3ddev->BeginScene();
///DRAW 3D IMAGE/////
D3DXMATRIX matView; // the view transform matrix
D3DXMatrixLookAtLH(&matView,
&D3DXVECTOR3 (SCREEN_WIDTH/2, SCREEN_HEIGHT/2, SCREEN_HEIGHT/2), // the camera position
&D3DXVECTOR3 (SCREEN_WIDTH/2, SCREEN_HEIGHT/2, 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(90), // the horizontal field of view
(FLOAT)SCREEN_WIDTH / (FLOAT)SCREEN_HEIGHT, // aspect ratio
1.0f, // the near view-plane
SCREEN_HEIGHT/2+10); // the far view-plane
d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection); // set the projection
d3ddev->SetTexture( 0, g_pTexture );
// select which vertex format we are using
d3ddev->SetFVF(CUSTOMFVF);
// 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_TRIANGLESTRIP, 0, 2);
//DRAW ABSOLUTE IMAGE
d3ddev->SetTexture( 0, g_pTexture );
// select which vertex format we are using
d3ddev->SetFVF(CUSTOMFLATFVF);
// select the vertex buffer to display
d3ddev->SetStreamSource(0, v_buffer2, 0, sizeof(CUSTOMFLATVERTEX));
// copy the vertex buffer to the back buffer
d3ddev->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
d3ddev->EndScene();
d3ddev->Present(NULL, NULL, NULL, NULL);
}
// 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
g_pTexture->Release();
v_buffer2->Release();
}
// this is the function that puts the 3D models into video RAM
void init_graphics(void)
{
//LOAD TEXTURE
D3DXIMAGE_INFO SrcInfo; //Optional
//Use a magenta colourkey
D3DCOLOR colorkey = 0xFFFF00FF;
if (FAILED(D3DXCreateTextureFromFileEx (d3ddev, L"banana.png", D3DX_DEFAULT_NONPOW2, D3DX_DEFAULT_NONPOW2, 0, 0,
D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, D3DX_DEFAULT, D3DX_DEFAULT,
colorkey, &SrcInfo, NULL, &g_pTexture)))
{
;
}
// create the vertices using the CUSTOMVERTEX struct
CUSTOMVERTEX vertices[] =
{ { 50.0f, 50.0f+32.0f, 1.0f, 0.0f, 1.0f, D3DCOLOR_XRGB(255, 0, 0), },
{ 50.0f, 50.0f, 1.0f, 0.0f, 0.0f, D3DCOLOR_XRGB(255, 0, 0), },
{ 50.0f+32.0f, 50.0f+32.0f, 1.0f, 1.0f, 1.0f, D3DCOLOR_XRGB(0, 0, 255), },
{ 50.0f+32.0f, 50.0f, 1.0f, 1.0f, 0.0f, D3DCOLOR_XRGB(0, 255, 0), },
};
CUSTOMFLATVERTEX vertices2[] =
{
{0.0f, 32.0f, 0.0f, 1.0f, 0.0f, 1.0f, D3DCOLOR_XRGB(255,255,255),},
{0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, D3DCOLOR_XRGB(255, 255, 255),},
{32.0f, 32.0f, 0.0f, 1.0f, 1.0f, 1.0f, D3DCOLOR_XRGB(255, 255, 255),},
{32.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, D3DCOLOR_XRGB(255, 255, 255),},
};
// create a vertex buffer interface called v_buffer
d3ddev->CreateVertexBuffer(4*sizeof(CUSTOMVERTEX),
0,
CUSTOMFVF,
D3DPOOL_MANAGED,
&v_buffer,
NULL);
d3ddev->CreateVertexBuffer(4*sizeof(CUSTOMFLATVERTEX),
0,
CUSTOMFLATFVF,
D3DPOOL_MANAGED,
&v_buffer2,
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();
v_buffer2->Lock(0, 0, (void**)&pVoid, 0);
memcpy(pVoid, vertices2, sizeof(vertices2));
v_buffer2->Unlock();
}
