SDI Technologies iH30 Especificações descarregar pdf (Página 22)

Data Transfer

Quadro SDI Output PG-03776-001_v06 | 17

Code Listing 12: Choosing a 16-bit Floating Point Pixel Format

int format = 0;

int nformats = 0;

int attribList = {

WGL_RED_BITS_ARB, 16,

WGL_GREEN_BITS_ARB, 16,

WGL_BLUE_BITS_ARB, 16,

WGL_ALPHA_BITS_ARB, 16,

WGL_STENCIL_BITS_ARB, 8,

WGL_DEPTH_BITS_ARB, 24,

WGL_DRAW_TO_PBUFFER_ARB, true,

WGL_BIND_TO_VIDEO_RGBA_NV, true,

WGL_FLOAT_COMPONENTS_NV, true,

wglChoosePixelFormat(hDC, attribList, 1, &format, &nformats);

Once an available pixel format that meets the requirements has been specified, a pbuffer

can be created using the

wglCreatePbufferARB() function. For video output, the

attribute list specified as the final argument must contain one of

WGL_BIND_TO_VIDEO_RGB_NV, WGL_BIND_TO_VIDEO_RGBA_NV

, or

WGL_BIND_TO_VIDEO_RGB_AND_DEPTH_NV. Code Listing 13 demonstrates pbuffer

creation.

Code Listing 13: Creating a Pbuffer

attribList[0] = WGL_BIND_TO_VIDEO_RGBA_NV;

attribList[1] = true;

attribList[2] = 0;

hPbuf = wglCreatePbufferARB(hDC, format, width, height,

attribList);

Once one or more pbuffers has been created using the above procedure, each of these

pbuffers must be bound to the video device so that subsequent OpenGL rendering is

sent to the video output device. Prior to binding however, it is necessary to identify the

video devices available using the

wglGetVideoDeviceNV() function from the

WGL_NV_video_out extension.

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