SDI Technologies iH30 Especificaciones descargar pdf (Pagina 55)

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Quadro SDI Output PG-03776-001_v06 | 50

Code Listing 38: Determining Number of Buffers Queued

static int cur_query = 0;

static bool queryTime = GL_FALSE;

GLuint64EXT presentTime;

static GLuint64EXT lastPresentTime = 0;

GLuint durationTime;

static GLuint64EXT sendTime[NUM_QUERIES];

GLuint presentTimeID = gPresentID[cur_query];

GLuint presentDurationID = gDurationID[cur_query];

cur_query++;

// Query video present time and duration. Only do this once

// we have been through the query loop once to ensure that

// results are available.

if (queryTime) {

glGetQueryObjectui64vEXT(presentTimeID,

GL_QUERY_RESULT_ARB, &presentTime);

glGetQueryObjectuivARB(presentDurationID,

GL_QUERY_RESULT_ARB, &durationTime);

float latency = (presentTime - sendTime[cur_query]) *

.000001;

float presentationInterval = (presentTime –

lastPresentTime) * .000001;

int bufsQueued = (int)(latency / presentationInterval);

fprintf(stderr, "send time: %I64d present time: %I64d latency:

%f msec present interval: %f msec buffs queued: %d duration: %d

frame\n",

sendTime[cur_query], presentTime, latency,

presentationInterval, bufsQueued, durationTime);

lastPresentTime = presentTime;

}

// Query send time

glGetVideoui64vNV(1, GL_CURRENT_TIME_NV, &sendTime[cur_query]);

// Draw to video

glPresentFrameKeyedNV(1, 0,

presentTimeID, presentDurationID,

GL_FRAME_NV,

GL_TEXTURE_RECTANGLE_NV, gTO, 0,

GL_NONE, 0, 0);

if (cur_query == NUM_QUERIES) {

cur_query = 0;0

queryTime = GL_TRUE;

}

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