static HRESULT WINAPI IDirect3DViewportImpl_TransformVertices	(	IDirect3DViewport3 *	iface,
		DWORD	dwVertexCount,
		D3DTRANSFORMDATA *	lpData,
		DWORD	dwFlags,
		DWORD *	lpOffScreen
	)		`[static]`
Definition at line 399 of file viewport.c.
{
    IDirect3DViewportImpl *This = impl_from_IDirect3DViewport3(iface);
    D3DMATRIX view_mat, world_mat, mat;
    float *in;
    float *out;
    float x, y, z, w;
    unsigned int i;
    D3DVIEWPORT vp = This->viewports.vp1;
    D3DHVERTEX *outH;

    TRACE("iface %p, vertex_count %u, vertex_data %p, flags %#x, clip_plane %p.\n",
            iface, dwVertexCount, lpData, dwFlags, lpOffScreen);

    /* Tests on windows show that Windows crashes when this occurs,
     * so don't return the (intuitive) return value
    if(!This->active_device)
    {
        WARN("No device active, returning D3DERR_VIEWPORTHASNODEVICE\n");
        return D3DERR_VIEWPORTHASNODEVICE;
    }
     */

    if(!(dwFlags & (D3DTRANSFORM_UNCLIPPED | D3DTRANSFORM_CLIPPED)))
    {
        WARN("No clipping flag passed, returning DDERR_INVALIDPARAMS\n");
        return DDERR_INVALIDPARAMS;
    }


    wined3d_mutex_lock();
    wined3d_device_get_transform(This->active_device->wined3d_device,
            D3DTRANSFORMSTATE_VIEW, (struct wined3d_matrix *)&view_mat);
    wined3d_device_get_transform(This->active_device->wined3d_device,
            WINED3D_TS_WORLD_MATRIX(0), (struct wined3d_matrix *)&world_mat);
    multiply_matrix(&mat, &view_mat, &world_mat);
    multiply_matrix(&mat, &This->active_device->legacy_projection, &mat);

    in = lpData->lpIn;
    out = lpData->lpOut;
    outH = lpData->lpHOut;
    for(i = 0; i < dwVertexCount; i++)
    {
        x = (in[0] * mat._11) + (in[1] * mat._21) + (in[2] * mat._31) + (1.0 * mat._41);
        y = (in[0] * mat._12) + (in[1] * mat._22) + (in[2] * mat._32) + (1.0 * mat._42);
        z = (in[0] * mat._13) + (in[1] * mat._23) + (in[2] * mat._33) + (1.0 * mat._43);
        w = (in[0] * mat._14) + (in[1] * mat._24) + (in[2] * mat._34) + (1.0 * mat._44);

        if(dwFlags & D3DTRANSFORM_CLIPPED)
        {
            /* If clipping is enabled, Windows assumes that outH is
             * a valid pointer
             */
            outH[i].u1.hx = x; outH[i].u2.hy = y; outH[i].u3.hz = z;

            outH[i].dwFlags = 0;
            if(x * vp.dvScaleX > ((float) vp.dwWidth * 0.5))
                outH[i].dwFlags |= D3DCLIP_RIGHT;
            if(x * vp.dvScaleX <= -((float) vp.dwWidth) * 0.5)
                outH[i].dwFlags |= D3DCLIP_LEFT;
            if(y * vp.dvScaleY > ((float) vp.dwHeight * 0.5))
                outH[i].dwFlags |= D3DCLIP_TOP;
            if(y * vp.dvScaleY <= -((float) vp.dwHeight) * 0.5)
                outH[i].dwFlags |= D3DCLIP_BOTTOM;
            if(z < 0.0)
                outH[i].dwFlags |= D3DCLIP_FRONT;
            if(z > 1.0)
                outH[i].dwFlags |= D3DCLIP_BACK;

            if(outH[i].dwFlags)
            {
                /* Looks like native just drops the vertex, leaves whatever data
                 * it has in the output buffer and goes on with the next vertex.
                 * The exact scheme hasn't been figured out yet, but windows
                 * definitely writes something there.
                 */
                out[0] = x;
                out[1] = y;
                out[2] = z;
                out[3] = w;
                in = (float *) ((char *) in + lpData->dwInSize);
                out = (float *) ((char *) out + lpData->dwOutSize);
                continue;
            }
        }

        w = 1 / w;
        x *= w; y *= w; z *= w;

        out[0] = vp.dwWidth / 2 + vp.dwX + x * vp.dvScaleX;
        out[1] = vp.dwHeight / 2 + vp.dwY - y * vp.dvScaleY;
        out[2] = z;
        out[3] = w;
        in = (float *) ((char *) in + lpData->dwInSize);
        out = (float *) ((char *) out + lpData->dwOutSize);
    }

    /* According to the d3d test, the offscreen flag is set only
     * if exactly one vertex is transformed. Its not documented,
     * but the test shows that the lpOffscreen flag is set to the
     * flag combination of clipping planes that clips the vertex.
     *
     * If clipping is requested, Windows assumes that the offscreen
     * param is a valid pointer.
     */
    if(dwVertexCount == 1 && dwFlags & D3DTRANSFORM_CLIPPED)
    {
        *lpOffScreen = outH[0].dwFlags;
    }
    else if(*lpOffScreen)
    {
        *lpOffScreen = 0;
    }
    wined3d_mutex_unlock();

    TRACE("All done\n");
    return DD_OK;
}
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