Direct3d translucent Rendering

Purpose:

Use direct3d to render image a translucent to image B.

Steps:

1. Create a standard Win32 program and add the object definition and function declaration to be used:

Ccomptr <idirect3d9> pd3d9; <br/> ccomptr <idirect3ddevice9> pd3ddevice9; <br/> ccomptr <strong> ptexture1; <br/> ccomptr <strong> ptexture2; <br/> d3dpresent_parameters gd3dpp; </P> <p> hresult create (hwnd); <br/> hresult drawtexture (idirect3dtexture9 * ptexture, <br/> float fleft, float ftop, float fright, float fbottom, d3dcolor CLR); <br/> void setstate (); <br/> hresult present ();

 

2. Create the required object, that is, implement the CREATE (hwnd) function:

Hresult create (hwnd) <br/>{< br/> pd3d9 = direct3dcreate9 (d3d_sdk_version); <br/> If (pd3d9 = NULL) <br/>{< br/> return s_false; <br/>}</P> <p> d3dcaps9 caps; <br/> pd3d9-> getdevicecaps (d3dadapter_default, d3ddevtype_hal, & amp; caps); <br/> DWORD dwbf; <br/> If (caps. devcaps & d3ddevcaps_hwtransformanlight) <br/>{< br/> dwbf = Hangzhou; <br/>}< br/> else <br/>{< br/> dwbf = d3dcreate_software_vertexprocessing; <br/>}< br/> If (caps. devcaps & d3ddevcaps_puredevice) <br/>{< br/> dwbf | = d3dcreate_puredevice; <br/>}</P> <p> d3ddisplaymode d3ddm; <br/> pd3d9-> getadapterdisplaymode (d3dadapter_default, & d3ddm); <br/> gd3dpp. backbuffercount = 1; <br/> gd3dpp. required wed = true; <br/> gd3dpp. hdevicewindow = hwnd; <br/> gd3dpp. swapeffect = d3dswapeffect_copy; <br/> gd3dpp. backbufferformat = d3ddm. format; </P> <p> hresult hR = pd3d9-> createdevice (<br/> d3dadapter_default, <br/> d3ddevtype_hal, <br/> hwnd, <br/> dwbf, <br/> & gd3dpp, <br/> & pd3ddevice9); <br/> If (failed (HR )) <br/>{< br/> return hr; <br/>}</P> <p> d3dxcreatetexturefromfileex (pd3ddevice9, <br/> L "B .jpg ", <br/> d3dx_default, <br/> d3dx_default, <br/> d3dx_default, <br/> 0, <br/> d3dfmt_unknown, <br/> d3dpool_managed, <br/> d3dx_default, <br/> d3dx_default, <br/> 0, <br/> null, <br/> null, <br/> & ptexture1.p ); </P> <p> d3dxcreatetexturefromfileex (pd3ddevice9, <br/> L "a.jpg", <br/> d3dx_default, <br/> d3dx_default, <br/> d3dx_default, <br/> 0, <br/> d3dfmt_unknown, <br/> d3dpool_managed, <br/> d3dx_default, <br/> d3dx_default, <br/> 0, <br/> null, <br/> null, <br/> & ptexture2.p); </P> <p> return s_ OK; <br/>}

 

3. Function for rendering image drawtexture:

Hresult drawtexture (idirect3dtexture9 * ptexture, float fleft, float ftop, float fright, float fbottom, d3dcolor CLR) <br/>{< br/> pd3ddevice9-> beginscene (); </P> <p> pd3ddevice9-> settexture (0, ptexture); <br/> pd3ddevice9-> setfvf (d3dfvf_xyzrhw | d3dfvf_diffuse | d3dfvf_tex1 ); </P> <p> struct <br/> {<br/> float X, Y, Z, rhw; <br/> d3dcolor CLR; <br/> float tu, TV; <br/>} pvertices [4]; </P> <p> pvertices [0]. X = fleft; <br/> pvertices [0]. y = fbottom; <br/> pvertices [0]. z = 1.f; <br/> pvertices [0]. rhw = 1.f; <br/> pvertices [0]. CLR = CLR; <br/> pvertices [0]. tu = 0.f; <br/> pvertices [0]. TV = 1.f; </P> <p> pvertices [1]. X = fleft; <br/> pvertices [1]. y = ftop; <br/> pvertices [1]. z = 1.f; <br/> pvertices [1]. rhw = 1.f; <br/> pvertices [1]. CLR = CLR; <br/> pvertices [1]. tu = 0.f; <br/> pvertices [1]. TV = 0.f; </P> <p> pvertices [2]. X = fright; <br/> pvertices [2]. y = fbottom; <br/> pvertices [2]. z = 1.f; <br/> pvertices [2]. rhw = 1.f; <br/> pvertices [2]. CLR = CLR; <br/> pvertices [2]. tu = 1.f; <br/> pvertices [2]. TV = 1.f; </P> <p> pvertices [3]. X = fright; <br/> pvertices [3]. y = ftop; <br/> pvertices [3]. z = 1.f; <br/> pvertices [3]. rhw = 1.f; <br/> pvertices [3]. CLR = CLR; <br/> pvertices [3]. tu = 1.f; <br/> pvertices [3]. TV = 0.f; </P> <p> pd3ddevice9-> drawprimitiveup (d3dpt_trianglestrip, 2, pvertices, sizeof (pvertices [0]); </P> <p> pd3ddevice9-> endscene (); </P> <p> return s_ OK; <br/>}

 

4. setstate () function:

Void setstate () <br/>{< br/> pd3ddevice9-> setrenderstate (success, true); <br/> pd3ddevice9-> setrenderstate (d3drs_srcblend, d3dblend_srcalpha ); <br/> pd3ddevice9-> setrenderstate (d3drs_destblend, success); <br/> pd3ddevice9-> settexturestagestate (0, d3dtss_alphaop, d3dtop_modulate ); <br/> pd3ddevice9-> settexturestagestate (0, d3dtss_alph1_g1, d3dta_diffuse); <br/>}< br/>

 

5. display the present () function:

Hresult present () <br/>{< br/> setstate (); <br/> drawtexture (ptexture1.p, 567,440, 0 xffffffff ); <br/> drawtexture (ptexture2.p, 667,420, 0xa0ffffff); <br/> pd3ddevice9-> present (null, null); <br/> return s_ OK; <br/>}

 

6. process the message: Call create (hwnd) in the wm_create message; call present () in the middle of beginpaint (hwnd, & PS) and endpaint (hwnd, & PS) of the wm_paint message ();

 

Note:

1. rendering by distance and proximity;

2. Set a high 8-bit rhw value to handle transparency. That is, the ** bit in 0x ** ffffff, 00 indicates completely transparent, FF indicates opacity, and the intermediate value is translucent.

 

Engineering: http://download.csdn.net/source/3318014