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Data Transfer

Quadro SDI Output PG-03776-001_v06 | 18

Code Listing 14: Get Video Devices Available on the System

HPVIDEODEV hpDevList;

if ((wglGetVideoDeviceNV(hDC, 1, &hpDevList) != GL_NOERROR) {

// Handle error.

}

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

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

WGL_VIDEO_OUT_COLOR_NV, WGL_VIDEO_OUT_ALPHA_NV,

WGL_VIDEO_OUT_COLOR_AND_ALPHA_NV

or WGL_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 15, the color and alpha portions of the pbuffer

specified by hPbuf are bound to the video device.

Code Listing 15: Binding a Pbuffer to a Video Device

if ((wglBindVideoImageNV(hpDevList, hPbuf,

WGL_VIDEO_OUT_COLOR_AND_ALPHA) != GL_NOERROR) {

// Handle error.

}

On Linux, a pbuffer is created using a combination of glxChooseFBConfig() to choose

compatible frame buffer configurations and

glXCreatePbuffer() to create a pbuffer of

the width and height required. This process for both an 8-bit integer and a 16-bit floating

point pbuffer is outlined in Code Listing 16 and Code Listing 17.





Note: Once glXChooseFBConfig returns the list of compatible frame buffer

configurations, an application must traverse the list to find a configuration of the

desired color depth.

Code Listing 16: Creating an 8-bit Pbuffer on Linux

GLXFBConfig *configs, config;

int nelements;

int config_list[] = { GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,

GLX_ALPHA_SIZE, 8,

GLX_DOUBLE_BUFFER, GL_TRUE,

GLX_RENDER_TYPE, GLX_RGBA_BIT,

None };

int pbuffer_list[8];

configs = glXChooseFBConfig(dpy, 0, config_list, &nelements);

// Find a config with the right number of color bits.

for (i = 0; i < nelements; i++) {

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