vlc之d3d渲染流程

由于工作需要，最近在研究YUV420P格式的视频的渲染，决定采用vlc的渲染机制进行，这里记录d3d的流程

大的流程如下：

打开和关闭定义：

static int  Open(vlc_object_t *);
static void Close(vlc_object_t *);

设置完之后可以调用：

set_callbacks(Open, Close)

其他函数在vout_display_t函数指针设置如下：

    vd->pool    = Pool;
    vd->prepare = Prepare;
    vd->display = Display;
    vd->control = Control;
    vd->manage  = Manage;

--------------------********Open部分**************-------------------------------

1、加载d3d9库

sys->hd3d9_dll = LoadLibrary(TEXT("D3D9.DLL"));

2、得到Direct3D9函数指针

OurDirect3DCreate9 =
        (LPDIRECT3D9 (__stdcall *)(UINT))GetProcAddress(sys->hd3d9_dll, "Direct3DCreate9");	

3、创建Direct3D9对象

LPDIRECT3D9 d3dobj = OurDirect3DCreate9(D3D_SDK_VERSION);

4、检测设备是否支持HAL设备（HAL需要的是硬件支持，速度快）

HRESULT hr = IDirect3D9_GetDeviceCaps(d3dobj, D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, &sys->d3dcaps);

5、测试设备能力，选择正确的渲染函数

if (!(sys->d3dcaps.DevCaps2 & D3DDEVCAPS2_CAN_STRETCHRECT_FROM_TEXTURES) ||
        !(sys->d3dcaps.TextureFilterCaps & (D3DPTFILTERCAPS_MAGFLINEAR)) ||
        !(sys->d3dcaps.TextureFilterCaps & (D3DPTFILTERCAPS_MINFLINEAR))) {
        msg_Err(vd, "Device does not support stretching from textures.");
        return VLC_EGENERIC;
    }

6、获取显示模式

D3DDISPLAYMODE d3ddm;
    HRESULT hr = IDirect3D9_GetAdapterDisplayMode(sys->d3dobj,
                                                  D3DADAPTER_DEFAULT, &d3ddm);

7、获取适配器描述

IDirect3D9_GetAdapterIdentifier(d3dobj,AdapterToUse,0, &d3dai)

8、创建一个设备

HRESULT hr = IDirect3D9_CreateDevice(d3dobj, AdapterToUse,
                                         DeviceType, sys->hvideownd,
                                         D3DCREATE_SOFTWARE_VERTEXPROCESSING|
                                         D3DCREATE_MULTITHREADED,
                                         &sys->d3dpp, &d3ddev);

9、检测设备支持格式

hr = IDirect3D9_CheckDeviceFormat(d3dobj, D3DADAPTER_DEFAULT,
                                      D3DDEVTYPE_HAL, dst, 0,
                                      D3DRTYPE_SURFACE, src);

hr = IDirect3D9_CheckDeviceFormatConversion(d3dobj,
                                                    D3DADAPTER_DEFAULT,
                                                    D3DDEVTYPE_HAL,
                                                    src, dst);

10、创建一个Surface（离屏表面。所谓的“离屏”指的是永远不在屏幕上显示）

LPDIRECT3DSURFACE9 surface;
    HRESULT hr = IDirect3DDevice9_CreateOffscreenPlainSurface(d3ddev,
                                                              fmt->i_width,
                                                              fmt->i_height,
                                                              d3dfmt->format,
                                                              D3DPOOL_DEFAULT,
                                                              &surface,
                                                              NULL);

11、填充黑色

IDirect3DDevice9_ColorFill(d3ddev, surface, NULL, D3DCOLOR_ARGB(0xFF, 0, 0, 0));

12、创建纹理

 LPDIRECT3DTEXTURE9 d3dtex;
    hr = IDirect3DDevice9_CreateTexture(d3ddev,
                                        fmt->i_width,
                                        fmt->i_height,
                                        1,
                                        D3DUSAGE_RENDERTARGET,
                                        sys->d3dpp.BackBufferFormat,
                                        D3DPOOL_DEFAULT,
                                        &d3dtex,
                                        NULL);

13、创建缓存

LPDIRECT3DVERTEXBUFFER9 d3dvtc;
    hr = IDirect3DDevice9_CreateVertexBuffer(d3ddev,
                                             sizeof(CUSTOMVERTEX)*4,
                                             D3DUSAGE_DYNAMIC|D3DUSAGE_WRITEONLY,
                                             D3DFVF_CUSTOMVERTEX,
                                             D3DPOOL_DEFAULT,
                                             &d3dvtc,
                                             NULL);

14、设置纹理采样属性

 // Texture coordinates outside the range [0.0, 1.0] are set
    // to the texture color at 0.0 or 1.0, respectively.
    IDirect3DDevice9_SetSamplerState(d3ddev, 0, D3DSAMP_ADDRESSU, D3DTADDRESS_CLAMP);
    IDirect3DDevice9_SetSamplerState(d3ddev, 0, D3DSAMP_ADDRESSV, D3DTADDRESS_CLAMP);

    // Set linear filtering quality
    if (sys->d3dcaps.TextureFilterCaps & D3DPTFILTERCAPS_MINFLINEAR) {
        msg_Dbg(vd, "Using D3DTEXF_LINEAR for minification");
        IDirect3DDevice9_SetSamplerState(d3ddev, 0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
    } else {
        msg_Dbg(vd, "Using D3DTEXF_POINT for minification");
        IDirect3DDevice9_SetSamplerState(d3ddev, 0, D3DSAMP_MINFILTER, D3DTEXF_POINT);
    }
    if (sys->d3dcaps.TextureFilterCaps & D3DPTFILTERCAPS_MAGFLINEAR) {
        msg_Dbg(vd, "Using D3DTEXF_LINEAR for magnification");
        IDirect3DDevice9_SetSamplerState(d3ddev, 0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
    } else {
        msg_Dbg(vd, "Using D3DTEXF_POINT for magnification");
        IDirect3DDevice9_SetSamplerState(d3ddev, 0, D3DSAMP_MAGFILTER, D3DTEXF_POINT);
    }

    // set maximum ambient light
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_AMBIENT, D3DCOLOR_XRGB(255,255,255));

    // Turn off culling
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_CULLMODE, D3DCULL_NONE);

    // Turn off the zbuffer
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ZENABLE, D3DZB_FALSE);

    // Turn off lights
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_LIGHTING, FALSE);

    // Enable dithering
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_DITHERENABLE, TRUE);

    // disable stencil
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_STENCILENABLE, FALSE);

    // manage blending
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ALPHABLENDENABLE, FALSE);
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_SRCBLEND,D3DBLEND_SRCALPHA);
    IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);

    if (sys->d3dcaps.AlphaCmpCaps & D3DPCMPCAPS_GREATER) {
        IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ALPHATESTENABLE,TRUE);
        IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ALPHAREF, 0x00);
        IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ALPHAFUNC,D3DCMP_GREATER);
    }

    // Set texture states
    IDirect3DDevice9_SetTextureStageState(d3ddev, 0, D3DTSS_COLOROP,D3DTOP_SELECTARG1);
    IDirect3DDevice9_SetTextureStageState(d3ddev, 0, D3DTSS_COLORARG1,D3DTA_TEXTURE);

    IDirect3DDevice9_SetTextureStageState(d3ddev, 0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
    IDirect3DDevice9_SetTextureStageState(d3ddev, 0, D3DTSS_ALPHAARG1,D3DTA_TEXTURE);
    IDirect3DDevice9_SetTextureStageState(d3ddev, 0, D3DTSS_ALPHAARG2,D3DTA_DIFFUSE);

--------------------********Prepare部分**************-------------------------------

1、释放锁定surface

HRESULT hr = IDirect3DSurface9_UnlockRect(picture->p_sys->surface);

2、测试设备是否可用

HRESULT hr = IDirect3DDevice9_TestCooperativeLevel(sys->d3ddev);

3、得到surface级别

hr = IDirect3DTexture9_GetSurfaceLevel(sys->d3dtex, 0, &destination);

4、拷贝图像到渲染surface

 hr = IDirect3DDevice9_StretchRect(sys->d3ddev, source, NULL, destination, NULL, D3DTEXF_LINEAR);

5、IDirect3DDevice9_Clear

 hr = IDirect3DDevice9_Clear(d3ddev, 0, NULL, D3DCLEAR_TARGET,
                                  D3DCOLOR_XRGB(0, 0, 0), 1.0f, 0);

6、IDirect3DDevice9_BeginScene

hr = IDirect3DDevice9_BeginScene(d3ddev);

7、IDirect3DVertexBuffer9_Lock

hr = IDirect3DVertexBuffer9_Lock(d3dvtc, 0, 0, &vertex, D3DLOCK_DISCARD);

8、IDirect3DVertexBuffer9_Unlock

hr = IDirect3DVertexBuffer9_Unlock(d3dvtc);

9、IDirect3DDevice9_SetTexture

hr = IDirect3DDevice9_SetTexture(d3ddev, 0, (LPDIRECT3DBASETEXTURE9)d3dtex);

10、IDirect3DDevice9_SetStreamSource

hr = IDirect3DDevice9_SetStreamSource(d3ddev, 0, d3dvtc, 0, sizeof(CUSTOMVERTEX));

11、IDirect3DDevice9_SetFVF

hr = IDirect3DDevice9_SetFVF(d3ddev, D3DFVF_CUSTOMVERTEX);

12、IDirect3DDevice9_DrawPrimitive

hr = IDirect3DDevice9_DrawPrimitive(d3ddev, D3DPT_TRIANGLEFAN, 0, 2);

13、IDirect3DDevice9_SetRenderState

IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ALPHABLENDENABLE, TRUE);

14、IDirect3DDevice9_SetRenderState

IDirect3DDevice9_SetRenderState(d3ddev, D3DRS_ALPHABLENDENABLE, FALSE);

15、IDirect3DDevice9_EndScene

hr = IDirect3DDevice9_EndScene(d3ddev);

16、释放

IDirect3DSurface9_Release(destination);

--------------------********Display部分**************-------------------------------

1、后台缓存内容渲染出来

HRESULT hr = IDirect3DDevice9_Present(d3ddev, &src, &dst, NULL, NULL);

2、锁定surface以获得指向图片缓冲区的有效指针

D3DLOCKED_RECT d3drect;
    HRESULT hr = IDirect3DSurface9_LockRect(picture->p_sys->surface, &d3drect, NULL, 0);