網格模型高級技術（5）

Direct3D對加載到內存中的網格模型提供了優化功能，通過網格模型優化可以明顯提高三維模型的渲染速度，這對渲染速度要求較高的三維圖形程序和游戲具有非常重要的現實意義。

對于程序員而言，對網格模型進行優化是比較簡單的，只需調用接口ID3DXMesh的方法Optimize()，該函數的聲明如下：

Generates a new mesh with reordered faces and vertices to optimize drawing performance.

HRESULT Optimize(
  DWORD Flags,
  CONST DWORD * pAdjacencyIn,
  DWORD * pAdjacencyOut,
  DWORD * pFaceRemap,
  LPD3DXBUFFER * ppVertexRemap,
  LPD3DXMESH * ppOptMesh
);

Parameters

Flags: [in] Specifies the type of optimization to perform. This parameter can be set to a combination of one or more flags from D3DXMESHOPT and D3DXMESH (except D3DXMESH_32BIT, D3DXMESH_IB_WRITEONLY, and D3DXMESH_WRITEONLY).
pAdjacencyIn: [in] Pointer to an array of three DWORDs per face that specifies the three neighbors for each face in the source mesh. If the edge has no adjacent faces, the value is 0xffffffff. See Remarks.
pAdjacencyOut: [in, out] Pointer to an array of three DWORDs per face that specifies the three neighbors for each face in the optimized mesh. If the edge has no adjacent faces, the value is 0xffffffff.
pFaceRemap: [in, out] An array of DWORDs, one per face, that identifies the original mesh face that corresponds to each face in the optimized mesh. If the value supplied for this argument is NULL, face remap data is not returned.
ppVertexRemap: [out] Address of a pointer to an ID3DXBuffer interface, which contains a DWORD for each vertex that specifies how the new vertices map to the old vertices. This remap is useful if you need to alter external data based on the new vertex mapping.
ppOptMesh: [out] Address of a pointer to an ID3DXMesh interface, representing the optimized mesh.

Return Values

If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be one of the following: D3DERR_INVALIDCALL, E_OUTOFMEMORY.

Remarks

This method generates a new mesh. Before running Optimize, an application must generate an adjacency buffer by calling ID3DXBaseMesh::GenerateAdjacency. The adjacency buffer contains adjacency data, such as a list of edges and the faces that are adjacent to each other.

This method is very similar to the ID3DXBaseMesh::CloneMesh method, except that it can perform optimization while generating the new clone of the mesh. The output mesh inherits all of the creation parameters of the input mesh.

Direct3D提供了7種網格模型優化方式，由枚舉常量D3DXMESHOPT定義：

Specifies the type of mesh optimization to be performed.

typedef enum D3DXMESHOPT
{
    D3DXMESHOPT_COMPACT = 0x01000000,
    D3DXMESHOPT_ATTRSORT = 0x02000000,
    D3DXMESHOPT_VERTEXCACHE = 0x04000000,
    D3DXMESHOPT_STRIPREORDER = 0x08000000,
    D3DXMESHOPT_IGNOREVERTS = 0x10000000,
    D3DXMESHOPT_DONOTSPLIT = 0x20000000,
    D3DXMESHOPT_DEVICEINDEPENDENT = 0x40000000,
} D3DXMESHOPT, *LPD3DXMESHOPT;

Constants

D3DXMESHOPT_COMPACT: Reorders faces to remove unused vertices and faces.
D3DXMESHOPT_ATTRSORT: Reorders faces to optimize for fewer attribute bundle state changes and enhanced ID3DXBaseMesh::DrawSubset performance.
D3DXMESHOPT_VERTEXCACHE: Reorders faces to increase the cache hit rate of vertex caches.
D3DXMESHOPT_STRIPREORDER: Reorders faces to maximize length of adjacent triangles.
D3DXMESHOPT_IGNOREVERTS: Optimize the faces only; do not optimize the vertices.
D3DXMESHOPT_DONOTSPLIT: While attribute sorting, do not split vertices that are shared between attribute groups.
D3DXMESHOPT_DEVICEINDEPENDENT: Affects the vertex cache size. Using this flag specifies a default vertex cache size that works well on legacy hardware.

Remarks

The D3DXMESHOPT_STRIPREORDER and D3DXMESHOPT_VERTEXCACHE optimization flags are mutually exclusive.

The D3DXMESHOPT_SHAREVB flag has been removed from this enumeration. Use D3DXMESH_VB_SHARE instead, in D3DXMESH.

D3DXMESH

Flags used to specify creation options for a mesh.

typedef enum D3DXMESH
{
    D3DXMESH_32BIT = 0x001,
    D3DXMESH_DONOTCLIP = 0x002,
    D3DXMESH_POINTS = 0x004,
    D3DXMESH_RTPATCHES = 0x008,
    D3DXMESH_NPATCHES = 0x4000,
    D3DXMESH_VB_SYSTEMMEM = 0x010,
    D3DXMESH_VB_MANAGED = 0x020,
    D3DXMESH_VB_WRITEONLY = 0x040,
    D3DXMESH_VB_DYNAMIC = 0x080,
    D3DXMESH_VB_SOFTWAREPROCESSING = 0x8000,
    D3DXMESH_IB_SYSTEMMEM = 0x100,
    D3DXMESH_IB_MANAGED = 0x200,
    D3DXMESH_IB_WRITEONLY = 0x400,
    D3DXMESH_IB_DYNAMIC = 0x800,
    D3DXMESH_IB_SOFTWAREPROCESSING = 0x10000,
    D3DXMESH_VB_SHARE = 0x1000,
    D3DXMESH_USEHWONLY = 0x2000,
    D3DXMESH_SYSTEMMEM = 0x110,
    D3DXMESH_MANAGED = 0x220,
    D3DXMESH_WRITEONLY = 0x440,
    D3DXMESH_DYNAMIC = 0x880,
    D3DXMESH_SOFTWAREPROCESSING = 0x18000,
} D3DXMESH, *LPD3DXMESH;

Constants

D3DXMESH_32BIT: The mesh has 32-bit indices instead of 16-bit indices. See Remarks.
D3DXMESH_DONOTCLIP: Use the D3DUSAGE_DONOTCLIP usage flag for vertex and index buffers.
D3DXMESH_POINTS: Use the D3DUSAGE_POINTS usage flag for vertex and index buffers.
D3DXMESH_RTPATCHES: Use the D3DUSAGE_RTPATCHES usage flag for vertex and index buffers.
D3DXMESH_NPATCHES: Specifying this flag causes the vertex and index buffer of the mesh to be created with D3DUSAGE_NPATCHES flag. This is required if the mesh object is to be rendered using N-patch enhancement using Direct3D.
D3DXMESH_VB_SYSTEMMEM: Use the D3DPOOL_SYSTEMMEM usage flag for vertex buffers.
D3DXMESH_VB_MANAGED: Use the D3DPOOL_MANAGED usage flag for vertex buffers.
D3DXMESH_VB_WRITEONLY: Use the D3DUSAGE_WRITEONLY usage flag for vertex buffers.
D3DXMESH_VB_DYNAMIC: Use the D3DUSAGE_DYNAMIC usage flag for vertex buffers.
D3DXMESH_VB_SOFTWAREPROCESSING: Use the D3DUSAGE_SOFTWAREPROCESSING usage flag for vertex buffers.
D3DXMESH_IB_SYSTEMMEM: Use the D3DPOOL_SYSTEMMEM usage flag for index buffers.
D3DXMESH_IB_MANAGED: Use the D3DPOOL_MANAGED usage flag for index buffers.
D3DXMESH_IB_WRITEONLY: Use the D3DUSAGE_WRITEONLY usage flag for index buffers.
D3DXMESH_IB_DYNAMIC: Use the D3DUSAGE_DYNAMIC usage flag for index buffers.
D3DXMESH_IB_SOFTWAREPROCESSING: Use the D3DUSAGE_SOFTWAREPROCESSING usage flag for index buffers.
D3DXMESH_VB_SHARE: Forces the cloned meshes to share vertex buffers.
D3DXMESH_USEHWONLY: Use hardware processing only. For mixed-mode device, this flag will cause the system to use hardware (if supported in hardware) or will default to software processing.
D3DXMESH_SYSTEMMEM: Equivalent to specifying both D3DXMESH_VB_SYSTEMMEM and D3DXMESH_IB_SYSTEMMEM.
D3DXMESH_MANAGED: Equivalent to specifying both D3DXMESH_VB_MANAGED and D3DXMESH_IB_MANAGED.
D3DXMESH_WRITEONLY: Equivalent to specifying both D3DXMESH_VB_WRITEONLY and D3DXMESH_IB_WRITEONLY.
D3DXMESH_DYNAMIC: Equivalent to specifying both D3DXMESH_VB_DYNAMIC and D3DXMESH_IB_DYNAMIC.
D3DXMESH_SOFTWAREPROCESSING: Equivalent to specifying both D3DXMESH_VB_SOFTWAREPROCESSING and D3DXMESH_IB_SOFTWAREPROCESSING.

Remarks

A 32-bit mesh (D3DXMESH_32BIT) can theoretically support (2^32)-1 faces and vertices. However, allocating memory for a mesh that large on a 32-bit operating system is not practical.

因為調用ID3DXMesh::Optimize()函數對網格模型進行優化時，需要用到網格模型中每個面的三個鄰接信息，該信息在加載網格模型時得到：

ID3DXBuffer* material_buffer;

V_RETURN(D3DXLoadMeshFromXW(L"Dwarf.x", D3DXMESH_MANAGED, pd3dDevice, &g_adj_buffer, &material_buffer, NULL,
							&g_num_materials, &g_mesh));

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;
	g_mesh_materials[i].Ambient = g_mesh_materials[i].Diffuse;

	WCHAR wfilename[256];
	RemovePathFromFileName(xmaterials[i].pTextureFilename, wfilename);

	g_mesh_textures[i] = NULL;

	if(xmaterials[i].pTextureFilename != NULL && lstrlen(wfilename) > 0)
	{
		V_RETURN(D3DXCreateTextureFromFileW(pd3dDevice, wfilename, &g_mesh_textures[i]));
	}
}

material_buffer->Release();

接著我們以三種方式對原始網格模型進行了優化：

DWORD* adj_in = (DWORD*) g_adj_buffer->GetBufferPointer();

V_RETURN(g_mesh->Optimize(D3DXMESHOPT_ATTRSORT | D3DXMESH_MANAGED, adj_in, NULL, NULL, NULL,
				 &g_mesh_attr_sort));

V_RETURN(g_mesh->Optimize(D3DXMESHOPT_STRIPREORDER | D3DXMESH_MANAGED, adj_in, NULL, NULL, NULL,
				 &g_mesh_strip_reorder));

V_RETURN(g_mesh->Optimize(D3DXMESHOPT_VERTEXCACHE | D3DXMESH_MANAGED, adj_in, NULL, NULL, NULL,
				 &g_mesh_vertex_cache));

渲染優化后的網格模型與未優化的網格模型相比沒有任何區別：

// Clear the render target and the zbuffer 
V( pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(0, 0, 0, 0), 1.0f, 0) );

// Render the scene
if( SUCCEEDED( pd3dDevice->BeginScene() ) )
{
	for(DWORD i = 0; i < g_num_materials; i++)
	{
		pd3dDevice->SetMaterial(&g_mesh_materials[i]);
		pd3dDevice->SetTexture(0, g_mesh_textures[i]);

		switch(g_render_flag)
		{
		case OPT_NONE:
			g_mesh->DrawSubset(i);
			break;

		case OPT_ATTR_SORT:
			g_mesh_attr_sort->DrawSubset(i);
			break;

		case OPT_STRIP_REORDER:
			g_mesh_strip_reorder->DrawSubset(i);
			break;

		case OPT_VERTEX_CACHE:
			g_mesh_vertex_cache->DrawSubset(i);
			break;
		}
	}

	RenderText();

	V(g_button_dlg.OnRender(fElapsedTime));

    V( pd3dDevice->EndScene() );
}

運行效果圖：

主程序：

#include "dxstdafx.h"
#include "resource.h"

#pragma warning(disable : 4127 4995)

#define IDC_TOGGLE_FULLSCREEN    1
#define IDC_TOGGLE_REF            2
#define IDC_CHANGE_DEVICE        3

#define OPT_NONE                0
#define OPT_ATTR_SORT            1
#define OPT_STRIP_REORDER        2
#define OPT_VERTEX_CACHE        3

#define release_com(p)    do { if(p) { (p)->Release(); (p) = NULL; } } while(0)

ID3DXFont*                    g_font;
ID3DXSprite*                g_text_sprite;
bool                        g_show_help = true;

CDXUTDialogResourceManager    g_dlg_resource_manager;
CD3DSettingsDlg                g_settings_dlg;
CDXUTDialog                    g_button_dlg;

ID3DXMesh*                    g_mesh;
D3DMATERIAL9*                g_mesh_materials;
IDirect3DTexture9**            g_mesh_textures;
DWORD                        g_num_materials;
ID3DXBuffer*                g_adj_buffer;

ID3DXMesh*                    g_mesh_attr_sort;
ID3DXMesh*                    g_mesh_strip_reorder;
ID3DXMesh*                    g_mesh_vertex_cache;
WCHAR                        g_opt_info[256];
int                            g_render_flag = OPT_NONE;

//--------------------------------------------------------------------------------------
// Rejects any devices that aren't acceptable by returning false
//--------------------------------------------------------------------------------------
bool CALLBACK IsDeviceAcceptable( D3DCAPS9* pCaps, D3DFORMAT AdapterFormat,
                                  D3DFORMAT BackBufferFormat, bool bWindowed, void* pUserContext )
{
    // Typically want to skip backbuffer formats that don't support alpha blending

    IDirect3D9* pD3D = DXUTGetD3DObject();

    if( FAILED( pD3D->CheckDeviceFormat( pCaps->AdapterOrdinal, pCaps->DeviceType, AdapterFormat,
                    D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING, D3DRTYPE_TEXTURE, BackBufferFormat ) ) )
        return false;

    return true;
}

//--------------------------------------------------------------------------------------
// Before a device is created, modify the device settings as needed.
//--------------------------------------------------------------------------------------
bool CALLBACK ModifyDeviceSettings( DXUTDeviceSettings* pDeviceSettings, const D3DCAPS9* pCaps, void* pUserContext )
{
    // If video card does not support hardware vertex processing, then uses sofaware vertex processing.
    if((pCaps->DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT) == 0)
        pDeviceSettings->BehaviorFlags = D3DCREATE_SOFTWARE_VERTEXPROCESSING;

    static bool is_first_time = true;

    if(is_first_time)
    {
        is_first_time = false;

        // if using reference device, then pop a warning message box.
        if(pDeviceSettings->DeviceType == D3DDEVTYPE_REF)
            DXUTDisplaySwitchingToREFWarning();
    }

    return true;
}

//--------------------------------------------------------------------------------------
// Remove path from fullname, and convert filename from multibyte to wchar.
//--------------------------------------------------------------------------------------
void RemovePathFromFileName(LPSTR fullname, LPWSTR wfilename)
{
    WCHAR wbuf[MAX_PATH]  = {0};
    MultiByteToWideChar(CP_ACP, 0, fullname, -1, wbuf, MAX_PATH);

    LPWSTR w_last_back_slash = wcsrchr(wbuf, '\\');

    if(w_last_back_slash)
        lstrcpy(wfilename, ++w_last_back_slash);
    else
        lstrcpy(wfilename, wbuf);
}

//--------------------------------------------------------------------------------------
// Create any D3DPOOL_MANAGED resources here
//--------------------------------------------------------------------------------------
HRESULT CALLBACK OnCreateDevice( IDirect3DDevice9* pd3dDevice,
                                 const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
                                 void* pUserContext )
{
    HRESULT    hr;

    V_RETURN(g_dlg_resource_manager.OnCreateDevice(pd3dDevice));
    V_RETURN(g_settings_dlg.OnCreateDevice(pd3dDevice));

    D3DXCreateFont(pd3dDevice, 18, 0, FW_BOLD, 1, FALSE, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, DEFAULT_QUALITY,
                   DEFAULT_PITCH | FF_DONTCARE, L"Arial", &g_font);

    ID3DXBuffer* material_buffer;

    V_RETURN(D3DXLoadMeshFromXW(L"Dwarf.x", D3DXMESH_MANAGED, pd3dDevice, &g_adj_buffer, &material_buffer, NULL,
                                &g_num_materials, &g_mesh));

    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;
        g_mesh_materials[i].Ambient = g_mesh_materials[i].Diffuse;

        WCHAR wfilename[256];
        RemovePathFromFileName(xmaterials[i].pTextureFilename, wfilename);

        g_mesh_textures[i] = NULL;

        if(xmaterials[i].pTextureFilename != NULL && lstrlen(wfilename) > 0)
        {
            V_RETURN(D3DXCreateTextureFromFileW(pd3dDevice, wfilename, &g_mesh_textures[i]));
        }
    }

    material_buffer->Release();

    lstrcpy(g_opt_info, L"optimize method: none");

    DWORD* adj_in = (DWORD*) g_adj_buffer->GetBufferPointer();

    V_RETURN(g_mesh->Optimize(D3DXMESHOPT_ATTRSORT | D3DXMESH_MANAGED, adj_in, NULL, NULL, NULL,
                     &g_mesh_attr_sort));

    V_RETURN(g_mesh->Optimize(D3DXMESHOPT_STRIPREORDER | D3DXMESH_MANAGED, adj_in, NULL, NULL, NULL,
                     &g_mesh_strip_reorder));

    V_RETURN(g_mesh->Optimize(D3DXMESHOPT_VERTEXCACHE | D3DXMESH_MANAGED, adj_in, NULL, NULL, NULL,
                     &g_mesh_vertex_cache));

    return S_OK;
}

//--------------------------------------------------------------------------------------
// Create any D3DPOOL_DEFAULT resources here
//--------------------------------------------------------------------------------------
HRESULT CALLBACK OnResetDevice( IDirect3DDevice9* pd3dDevice,
                                const D3DSURFACE_DESC* pBackBufferSurfaceDesc,
                                void* pUserContext )
{
    HRESULT hr;

    V_RETURN(g_dlg_resource_manager.OnResetDevice());
    V_RETURN(g_settings_dlg.OnResetDevice());
    V_RETURN(g_font->OnResetDevice());
    V_RETURN(D3DXCreateSprite(pd3dDevice, &g_text_sprite));

    // set dialog position and size

    g_button_dlg.SetLocation(pBackBufferSurfaceDesc->Width - 170, 0);
    g_button_dlg.SetSize(170, 170);

    // setup view matrix

    D3DXMATRIX mat_view;
    D3DXVECTOR3 eye(0.0f, 0.0f, -4.0f);
    D3DXVECTOR3  at(0.0f, 0.0f,  0.0f);
    D3DXVECTOR3  up(0.0f, 1.0f,  0.0f);

    D3DXMatrixLookAtLH(&mat_view, &eye, &at, &up);
    pd3dDevice->SetTransform(D3DTS_VIEW, &mat_view);

    // set projection matrix
    D3DXMATRIX mat_proj;
    float aspect = (float)pBackBufferSurfaceDesc->Width / pBackBufferSurfaceDesc->Height;
    D3DXMatrixPerspectiveFovLH(&mat_proj, D3DX_PI/4, aspect, 1.0f, 100.0f);
    pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat_proj);

    pd3dDevice->SetRenderState(D3DRS_AMBIENT, 0xFFFFFFFF);

    return S_OK;
}

//--------------------------------------------------------------------------------------
// Release resources created in the OnResetDevice callback here
//--------------------------------------------------------------------------------------
void CALLBACK OnLostDevice( void* pUserContext )
{
    g_dlg_resource_manager.OnLostDevice();
    g_settings_dlg.OnLostDevice();
    g_font->OnLostDevice();

    release_com(g_text_sprite);
}

//--------------------------------------------------------------------------------------
// Release resources created in the OnCreateDevice callback here
//--------------------------------------------------------------------------------------
void CALLBACK OnDestroyDevice( void* pUserContext )
{
    g_dlg_resource_manager.OnDestroyDevice();
    g_settings_dlg.OnDestroyDevice();

    delete[] g_mesh_materials;
    g_mesh_materials = NULL;

    if(g_mesh_textures)
    {
        for(DWORD i = 0; i < g_num_materials; i++)
            release_com(g_mesh_textures[i]);

        delete[] g_mesh_textures;
        g_mesh_textures = NULL;
    }

    release_com(g_font);
    release_com(g_adj_buffer);
    release_com(g_mesh);
    release_com(g_mesh_attr_sort);
    release_com(g_mesh_strip_reorder);
    release_com(g_mesh_vertex_cache);
}

//--------------------------------------------------------------------------------------
// Handle updates to the scene
//--------------------------------------------------------------------------------------
void CALLBACK OnFrameMove( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
    D3DXMATRIX mat_world, mat_translation, mat_rotation;

    D3DXMatrixTranslation(&mat_translation, 0, -0.7f, 0);
    D3DXMatrixRotationY(&mat_rotation, timeGetTime() / 1000.0f);
    mat_world = mat_translation * mat_rotation;

    pd3dDevice->SetTransform(D3DTS_WORLD, &mat_world);
}

//--------------------------------------------------------------------------------------
// Render the helper information
//--------------------------------------------------------------------------------------
void RenderText()
{
    CDXUTTextHelper text_helper(g_font, g_text_sprite, 20);

    text_helper.Begin();

    // show frame and device states
    text_helper.SetInsertionPos(5, 5);
    text_helper.SetForegroundColor( D3DXCOLOR(1.0f, 0.475f, 0.0f, 1.0f) );
    text_helper.DrawTextLine( DXUTGetFrameStats(true) );
    text_helper.DrawTextLine( DXUTGetDeviceStats() );

    // show other simple information
    text_helper.SetForegroundColor( D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f) );
    text_helper.DrawTextLine(g_opt_info);

    // show helper information

    const D3DSURFACE_DESC* surface_desc = DXUTGetBackBufferSurfaceDesc();

    if(g_show_help)
    {
        text_helper.SetInsertionPos(10, surface_desc->Height - 15 * 6);
        text_helper.SetForegroundColor( D3DXCOLOR(1.0f, 0.475f, 0.0f, 1.0f) );
        text_helper.DrawTextLine(L"Controls (F1 to hide):");

        text_helper.SetInsertionPos(40, surface_desc->Height - 15 * 4);
        text_helper.DrawTextLine(L"Quit: ESC");

        text_helper.SetInsertionPos(40, surface_desc->Height - 15 * 3);
        text_helper.DrawTextLine(L"0, 1, 2, 3: switch optimize method");
    }
    else
    {
        text_helper.SetInsertionPos(10, surface_desc->Height - 15 * 4);
        text_helper.SetForegroundColor( D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f) );
        text_helper.DrawTextLine(L"Press F1 for help");
    }

    text_helper.End();
}

//--------------------------------------------------------------------------------------
// Render the scene
//--------------------------------------------------------------------------------------
void CALLBACK OnFrameRender( IDirect3DDevice9* pd3dDevice, double fTime, float fElapsedTime, void* pUserContext )
{
    HRESULT hr;

    if(g_settings_dlg.IsActive())
    {
        g_settings_dlg.OnRender(fElapsedTime);
        return;
    }

    // Clear the render target and the zbuffer
    V( pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(0, 0, 0, 0), 1.0f, 0) );

    // Render the scene
    if( SUCCEEDED( pd3dDevice->BeginScene() ) )
    {
        for(DWORD i = 0; i < g_num_materials; i++)
        {
            pd3dDevice->SetMaterial(&g_mesh_materials[i]);
            pd3dDevice->SetTexture(0, g_mesh_textures[i]);

            switch(g_render_flag)
            {
            case OPT_NONE:
                g_mesh->DrawSubset(i);
                break;

            case OPT_ATTR_SORT:
                g_mesh_attr_sort->DrawSubset(i);
                break;

            case OPT_STRIP_REORDER:
                g_mesh_strip_reorder->DrawSubset(i);
                break;

            case OPT_VERTEX_CACHE:
                g_mesh_vertex_cache->DrawSubset(i);
                break;
            }
        }

        RenderText();

        V(g_button_dlg.OnRender(fElapsedTime));

        V( pd3dDevice->EndScene() );
    }
}

//--------------------------------------------------------------------------------------
// Handle messages to the application
//--------------------------------------------------------------------------------------
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam,
                          bool* pbNoFurtherProcessing, void* pUserContext )
{
    *pbNoFurtherProcessing = g_dlg_resource_manager.MsgProc(hWnd, uMsg, wParam, lParam);
    if(*pbNoFurtherProcessing)
        return 0;

    if(g_settings_dlg.IsActive())
    {
        g_settings_dlg.MsgProc(hWnd, uMsg, wParam, lParam);
        return 0;
    }

    *pbNoFurtherProcessing = g_button_dlg.MsgProc(hWnd, uMsg, wParam, lParam);
    if(*pbNoFurtherProcessing)
        return 0;

    return 0;
}

//--------------------------------------------------------------------------------------
// Handle keybaord event
//--------------------------------------------------------------------------------------
void CALLBACK OnKeyboardProc(UINT charater, bool is_key_down, bool is_alt_down, void* user_context)
{
    if(is_key_down)
    {
        switch(charater)
        {
        case VK_F1:
            g_show_help = !g_show_help;
            break;

        case 48:    // press key "0"
            g_render_flag = OPT_NONE;
            lstrcpy(g_opt_info, L"optimize method: none");
            break;

        case 49:    // press key "1"
            g_render_flag = OPT_ATTR_SORT;
            lstrcpy(g_opt_info, L"optimize method: D3DXMESHOPT_ATTRSORT");
            break;

        case 50:    // press key "2"
            g_render_flag = OPT_STRIP_REORDER;
            lstrcpy(g_opt_info, L"optimize method: D3DXMESHOPT_STRIPREORDER");
            break;

        case 51:    // press key "3"
            g_render_flag = OPT_VERTEX_CACHE;
            lstrcpy(g_opt_info, L"optimize method: D3DXMESHOPT_VERTEXCACHE");
            break;
        }
    }
}

//--------------------------------------------------------------------------------------
// Handle events for controls
//--------------------------------------------------------------------------------------
void CALLBACK OnGUIEvent(UINT event, int control_id, CDXUTControl* control, void* user_context)
{
    switch(control_id)
    {
    case IDC_TOGGLE_FULLSCREEN:
        DXUTToggleFullScreen();
        break;

    case IDC_TOGGLE_REF:
        DXUTToggleREF();
        break;

    case IDC_CHANGE_DEVICE:
        g_settings_dlg.SetActive(true);
        break;
    }
}

//--------------------------------------------------------------------------------------
// Initialize dialogs
//--------------------------------------------------------------------------------------
void InitDialogs()
{
    g_settings_dlg.Init(&g_dlg_resource_manager);
    g_button_dlg.Init(&g_dlg_resource_manager);

    g_button_dlg.SetCallback(OnGUIEvent);

    int x = 35, y = 10, width = 125, height = 22;

    g_button_dlg.AddButton(IDC_TOGGLE_FULLSCREEN, L"Toggle full screen", x, y,         width, height);
    g_button_dlg.AddButton(IDC_TOGGLE_REF,          L"Toggle REF (F3)",     x, y += 24, width, height);
    g_button_dlg.AddButton(IDC_CHANGE_DEVICE,      L"Change device (F2)", x, y += 24, width, height, VK_F2);
}

//--------------------------------------------------------------------------------------
// Initialize everything and go into a render loop
//--------------------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE, HINSTANCE, LPSTR, int )
{
    // Enable run-time memory check for debug builds.
#if defined(DEBUG) | defined(_DEBUG)
    _CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
#endif

    // Set the callback functions
    DXUTSetCallbackDeviceCreated( OnCreateDevice );
    DXUTSetCallbackDeviceReset( OnResetDevice );
    DXUTSetCallbackDeviceLost( OnLostDevice );
    DXUTSetCallbackDeviceDestroyed( OnDestroyDevice );
    DXUTSetCallbackMsgProc( MsgProc );
    DXUTSetCallbackFrameRender( OnFrameRender );
    DXUTSetCallbackFrameMove( OnFrameMove );
    DXUTSetCallbackKeyboard(OnKeyboardProc);

    // TODO: Perform any application-level initialization here
    InitDialogs();

    // Initialize DXUT and create the desired Win32 window and Direct3D device for the application
    DXUTInit( true, true, true ); // Parse the command line, handle the default hotkeys, and show msgboxes
    DXUTSetCursorSettings( true, true ); // Show the cursor and clip it when in full screen
    DXUTCreateWindow( L"OptimizedMesh" );
    DXUTCreateDevice( D3DADAPTER_DEFAULT, true, 640, 480, IsDeviceAcceptable, ModifyDeviceSettings );

    // Start the render loop
    DXUTMainLoop();

    // TODO: Perform any application-level cleanup here

    return DXUTGetExitCode();
}

下載示例工程

posted on 2008-05-27 16:55 lovedday 閱讀(1668) 評論(0) 編輯收藏引用

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天行健 君子當自強而不息

網格模型高級技術（5）

Parameters

Return Values

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Constants

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D3DXMESH

Constants

Remarks

公告

導航

統計

常用鏈接

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3D游戲編程相關鏈接

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