SDI Technologies iH30 Especificações descarregar pdf (Página 27)

Data Transfer

Quadro SDI Output PG-03776-001_v06 | 22

After creating one or more pbuffers using the procedure described in Code Listing 17,

each of these pbuffers must be bound to the video device so that subsequent OpenGL

rendering into that pbuffer is sent to the video output device. Prior to binding the

pbuffer however, it is necessary to identify the video devices available using the

glXGetVideoDeviceNV() function from the GLX_NV_video_out extension.

Code Listing 18: Getting Video Devices Available on a Linux System

GLXVideoDeviceNV video_device;

if (glXGetVideoDeviceNV(dpy, 0, 1, &video_device) {

// Handle error.

}

Once a video device has been identified, bind the application pbuffers using the

glXBindVideoImageNV() command. The final argument to this function must be one of

GLX_VIDEO_OUT_COLOR_NV, GLX_VIDEO_OUT_ALPHA_NV,

GLX_VIDEO_OUT_COLOR_AND_ALPHA_NV

or GLX_VIDEO_OUT_COLOR_AND_DEPTH_NV. This

argument specifies the data within the pbuffer that will ultimately get transferred to the

video out device. In Code Listing 19, the color and alpha portions of the pbuffer

specified by hPbuf are bound to the video device.

Code Listing 19: Binding a Pbuffer to a Linux Video Device

if (glXBindVideoImageNV(dpy, video_device,

pbuffer, GLX_VIDEO_OUT_COLOR_NV)) {

// Handle error.

}

Once the pbuffers are bound to the video device, video transfers can be started as

described in Starting Video Transfers. The procedure for sending frames/fields of data to

the device is described in the section entitled Sending FBO Data and Sending Pbuffer Data.

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SDI Technologies iH30 Especificações Página 27