HLSL 研究学习之六章三节

最新推荐文章于 2020-01-17 01:21:52 发布

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#null #float #winapi #structure #application #output

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本文介绍了一种在Direct3D中实现3D三角形纹理与色彩混合的方法，通过使用HLSL（High-Level Shader Language）及.fx文件，演示如何在不使用像素着色器的情况下完成纹理与单一颜色的混合。

(6_3)3D三角形纹理与色彩混合(fx中单一色,不用PS)

hlsl.fx:

// -------------------------------------------------------------
//hlsl.fx:(6_3)3D三角形纹理与色彩混合(fx中单一色,不用PS)
// -------------------------------------------------------------
// 全局变量
// -------------------------------------------------------------
float4x4 matWorldViewProj;
texture g_Texture;
string g_TexFile="banana.bmp";
// -------------------------------------------------------------
// 输出顶点信息结构
// -------------------------------------------------------------
struct VS_OUTPUT
{
    float4 Pos :       POSITION;
    float4 Diffuse    : COLOR0;
    float2 TexUV :      TEXCOORD0;
};

// -------------------------------------------------------------
// 顶点渲染指令段
// -------------------------------------------------------------
VS_OUTPUT VS(float4 Pos : POSITION,float2 TexUV: TEXCOORD0)
{
    VS_OUTPUT Out;
    Out.Pos = mul(Pos, matWorldViewProj); // transform Position
    Out.TexUV=TexUV;
    float4 diffuse = { 1.0f, 0.0f, 1.0f, 1.0f};
    Out.Diffuse.rgb = diffuse;
    Out.Diffuse.a = 1.0f;
    return Out;
}

// -------------------------------------------------------------
// 管道效果指令段
// -------------------------------------------------------------
technique TShader
{
    pass P0
    {
       Texture[0] = <g_Texture>;   //指定第一层纹理
       ColorOp[0] = Modulate;    //指定第一层色彩的操作方式
       ColorArg1[0] = Texture;   //指定第一层色彩操作方式的第一方为纹理
       ColorArg2[0] = Diffuse;   //指定第一层色彩操作方式的第二方为顶点色彩
       AlphaOp[0] = Modulate;    //指定第一层Alpha操作方式
       AlphaArg1[0] = Texture;   //指定第一层Alpha操作方式的第一方为从纹理中取得
       AlphaArg2[0] = Diffuse;   //指定第一层Alpha操作方式的第二方为从顶点色彩中取得
       MinFilter[0] = Linear;    //设置第一层纹理纹理过滤方式
       MagFilter[0] = Linear;    //设置第一层纹理纹理过滤方式
       MipFilter[0] = Linear;    //设置第一层纹理纹理过滤方式
       ColorOp[1] = Disable;     //关闭第二层纹理
       AlphaOp[1] = Disable;     //关闭第二层Alpha
        // 编译相应的指令段
        VertexShader = compile vs_1_1 VS();
    }
}

C++代码：

//-----------------------------------------------------------------------------
//HLSL学习:(6_3)3D三角形纹理与色彩混合(fx中单一色,不用PS)
//-----------------------------------------------------------------------------
#include <Windows.h>
#include <mmsystem.h>
#include <d3dx9.h>
#include <strsafe.h>

//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------
LPDIRECT3D9             g_pD3D       = NULL; // Used to create the D3DDevice
LPDIRECT3DDEVICE9       g_pd3dDevice = NULL; // Our rendering device
LPDIRECT3DVERTEXBUFFER9 g_pVB        = NULL; // Buffer to hold vertices
LPD3DXEFFECT            g_pEffect    = NULL;
LPDIRECT3DTEXTURE9      g_pTexture   = NULL; // Our texture
D3DXVECTOR4             g_LightDir= D3DXVECTOR4( 0.0f, 0.0f, 1.0f, 1.0f );
// A structure for our custom vertex type
struct CUSTOMVERTEX
{
    FLOAT x, y, z;      // The untransformed, 3D position for the vertex
    DWORD color;        // The vertex color
FLOAT tu, tv;
};

// Our custom FVF, which describes our custom vertex structure
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)

//-----------------------------------------------------------------------------
// Name: InitD3D()
// Desc: Initializes Direct3D
//-----------------------------------------------------------------------------
HRESULT InitD3D( HWND hWnd )
{
    // Create the D3D object.
    if( NULL == ( g_pD3D = Direct3DCreate9( D3D_SDK_VERSION ) ) )
        return E_FAIL;

    // Set up the structure used to create the D3DDevice
    D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;

    // Create the D3DDevice
    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pd3dDevice ) ) )
    {
        return E_FAIL;
    }

// Turn off culling, so we see the front and back of the triangle
g_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );

// Turn off D3D lighting, since we are providing our own vertex colors
g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );

//创建HLSH
if( FAILED(D3DXCreateEffectFromFile( g_pd3dDevice, "hlsl.fx", NULL, NULL,
D3DXSHADER_DEBUG, NULL, &g_pEffect, NULL ) ) )
{
return E_FAIL;
}
if( g_pEffect != NULL ) g_pEffect->OnResetDevice();

//设定效果:因为只有一个，所以初始时就设了~
D3DXHANDLE hTechnique = g_pEffect->GetTechniqueByName( "TShader" );
g_pEffect->SetTechnique( hTechnique );

return S_OK;
}

//-----------------------------------------------------------------------------
// Name: InitGeometry()
// Desc: Creates the scene geometry
//-----------------------------------------------------------------------------
HRESULT InitGeometry()
{
    // Initialize three vertices for rendering a triangle
    CUSTOMVERTEX g_Vertices[] =
    {
        { -1.0f,-1.0f, 0.0f, 0xffff0000,0.0f,1.0f},
        { 1.0f,-1.0f, 0.0f, 0xff0000ff,1.0f,1.0f},
        { 0.0f, 1.0f, 0.0f, 0xffffffff,0.5f,0.0f},
    };

    // Create the vertex buffer.
    if( FAILED( g_pd3dDevice->CreateVertexBuffer( 3*sizeof(CUSTOMVERTEX),
                                                  0, D3DFVF_CUSTOMVERTEX,
                                                  D3DPOOL_DEFAULT, &g_pVB, NULL ) ) )
    {
        return E_FAIL;
    }

    // Fill the vertex buffer.
    VOID* pVertices;
    if( FAILED( g_pVB->Lock( 0, sizeof(g_Vertices), (void**)&pVertices, 0 ) ) )
        return E_FAIL;
    memcpy( pVertices, g_Vertices, sizeof(g_Vertices) );
    g_pVB->Unlock();

const char* t_FileName;
g_pEffect->GetString("g_TexFile",&t_FileName);

if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, t_FileName, &g_pTexture ) ) )
{
MessageBox(NULL, "Could not find banana.bmp", "Textures.exe", MB_OK);
return E_FAIL;
}

g_pEffect->SetTexture( "g_Texture", g_pTexture );
return S_OK;
}

//-----------------------------------------------------------------------------
// Name: Cleanup()
// Desc: Releases all previously initialized objects
//-----------------------------------------------------------------------------
VOID Cleanup()
{
if( g_pTexture != NULL )
g_pTexture->Release();

if( g_pEffect != NULL )
g_pEffect->Release();

if( g_pVB != NULL )
g_pVB->Release();

if( g_pd3dDevice != NULL )
g_pd3dDevice->Release();

if( g_pD3D != NULL )
g_pD3D->Release();
}

//-----------------------------------------------------------------------------
// Name: SetupMatrices()
// Desc: Sets up the world, view, and projection transform matrices.
//-----------------------------------------------------------------------------
VOID SetupMatrices()
{
// For our world matrix, we will just rotate the object about the y-axis.
D3DXMATRIXA16 matWorld;

    UINT iTime = timeGetTime() % 1000;
    FLOAT fAngle = iTime * (2.0f * D3DX_PI) / 1000.0f;
    D3DXMatrixRotationY( &matWorld, fAngle );

    D3DXVECTOR3 vEyePt( 0.0f, 3.0f,-5.0f );
    D3DXVECTOR3 vLookatPt( 0.0f, 0.0f, 0.0f );
    D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
    D3DXMATRIXA16 matView;
    D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec );

D3DXMATRIXA16 matProj;
D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f );

//设定VS矩阵
D3DXMATRIX mWorldViewProj = matWorld * matView * matProj;
g_pEffect->SetMatrix( "matWorldViewProj", &mWorldViewProj );

}

//-----------------------------------------------------------------------------
// Name: Render()
// Desc: Draws the scene
//-----------------------------------------------------------------------------
VOID Render()
{
// Clear the backbuffer to a black color
g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0 );

    // Begin the scene
    if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )
    {
        // Setup the world, view, and projection matrices
        SetupMatrices();

//按VS，PS渲染
if( g_pEffect != NULL )
{
   UINT nPasses=0;
   UINT iPass=0;
   if(SUCCEEDED(g_pEffect->Begin( &nPasses, 0 )))
   {
    for(iPass = 0; iPass < nPasses; iPass ++ )
    {
     g_pEffect->BeginPass( iPass );
    }
    g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof(CUSTOMVERTEX) );
    g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );
    g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 1 );
    g_pEffect->EndPass();
    g_pEffect->End();
   }
}
        // End the scene
        g_pd3dDevice->EndScene();
    }

// Present the backbuffer contents to the display
g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}

//-----------------------------------------------------------------------------
// Name: MsgProc()
// Desc: The window's message handler
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
        case WM_DESTROY:
            Cleanup();
            PostQuitMessage( 0 );
            return 0;
    }

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

//-----------------------------------------------------------------------------
// Name: WinMain()
// Desc: The application's entry point
//-----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
    // Register the window class
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      "D3D Tutorial", NULL };
    RegisterClassEx( &wc );

    // Create the application's window
    HWND hWnd = CreateWindow( "D3D Tutorial", "HLSL学习6_3",
                              WS_OVERLAPPEDWINDOW, 100, 100, 256, 256,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    // Initialize Direct3D
    if( SUCCEEDED( InitD3D( hWnd ) ) )
    {
        // Create the scene geometry
        if( SUCCEEDED( InitGeometry() ) )
        {
            // 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
    {
     Render();
    }
            }
        }
    }