Forums - Query timer (EXT) issue

Hello,

I want to use the EXT_disjoint_timer_query extension for performance measures, but the functions always return values of 0. I'm using a Samsung Galaxy Note 4 with an Adreno 420 GPU, Android 5.0.1, OpenGL ES 3.1 (Extension support checked). My code is pretty much the same as in the examples (https://www.khronos.org/registry/gles/extensions/EXT/EXT_disjoint_timer_...), except `glGetQueryObjectivEXT`instead of `glGetQueryObjectiv` as it's not part of the core api.

Init code:

// load extensions
glGenQueriesEXT = (PFNGLGENQUERIESEXTPROC) eglGetProcAddress("glGenQueriesEXT");
glDeleteQueriesEXT = (PFNGLDELETEQUERIESEXTPROC) eglGetProcAddress("glDeleteQueriesEXT");
glIsQueryEXT = (PFNGLISQUERYEXTPROC) eglGetProcAddress("glIsQueryEXT");
glBeginQueryEXT = (PFNGLBEGINQUERYEXTPROC) eglGetProcAddress("glBeginQueryEXT");
glEndQueryEXT = (PFNGLENDQUERYEXTPROC) eglGetProcAddress("glEndQueryEXT");
glQueryCounterEXT = (PFNGLQUERYCOUNTEREXTPROC) eglGetProcAddress("glQueryCounterEXT");
glGetQueryivEXT = (PFNGLGETQUERYIVEXTPROC) eglGetProcAddress("glGetQueryivEXT");

glGetQueryObjectivEXT = (PFNGLGETQUERYOBJECTIVEXTPROC) eglGetProcAddress("glGetQueryObjectivEXT");
glGetQueryObjectuivEXT = (PFNGLGETQUERYOBJECTUIVEXTPROC) eglGetProcAddress("glGetQueryObjectuivEXT");
glGetQueryObjecti64vEXT = (PFNGLGETQUERYOBJECTI64VEXTPROC) eglGetProcAddress("glGetQueryObjecti64vEXT");
glGetQueryObjectui64vEXT = (PFNGLGETQUERYOBJECTUI64VEXTPROC) eglGetProcAddress("glGetQueryObjectui64vEXT");

GL_CHECK(glGenQueries(1, &m_QueryScope));
GL_CHECK(glGenQueries(1, &m_QueryStart));
GL_CHECK(glGenQueries(1, &m_QueryStop));

Rendering code (with glBeginQuery/glEndQuery):

GLuint64 TimeStart;
    int ResultAvailable = 0;
    int disjointOccurred = 0;

    GL_CHECK(glGetIntegerv(GL_GPU_DISJOINT_EXT, &disjointOccurred));
    GL_CHECK(glBeginQuery(GL_TIME_ELAPSED_EXT, m_QueryScope));

    //
    // Some draw calls ..
    //

    GL_CHECK(glEndQuery(GL_TIME_ELAPSED_EXT));

    while(!ResultAvailable) {
        GL_CHECK(glGetQueryObjectivEXT(m_QueryScope, GL_QUERY_RESULT_AVAILABLE, &ResultAvailable));
    }

    GL_CHECK(glGetIntegerv(GL_GPU_DISJOINT_EXT, &disjointOccurred));

    if(!disjointOccurred) {
        GL_CHECK(glGetQueryObjectui64vEXT(m_QueryScope, GL_QUERY_RESULT, &TimeElapsed));
    }
    else
        LOGI("disjoint occured");

    LOGI("Time elapsed: %llu", TimeElapsed); // TimeElapsed return 0

Rendering code (with glQueryCounter):

    GLuint64 TimeStart, TimeStop;
    int ResultAvailable = 0;
    int disjointOccurred = 0;

    GL_CHECK(glGetIntegerv(GL_GPU_DISJOINT_EXT, &disjointOccurred));
    GL_CHECK(glQueryCounterEXT(m_QueryStart, GL_TIMESTAMP_EXT));

    //
    // Some draw calls ..
    //

    GL_CHECK(glQueryCounterEXT(m_QueryStop, GL_TIMESTAMP_EXT));

    while(!ResultAvailable) {
        GL_CHECK(glGetQueryObjectivEXT(m_QueryStop, GL_QUERY_RESULT_AVAILABLE, &ResultAvailable));
    }

    GL_CHECK(glGetIntegerv(GL_GPU_DISJOINT_EXT, &disjointOccurred));

    if(!disjointOccurred) {
        GL_CHECK(glGetQueryObjectui64vEXT(m_QueryStart, GL_QUERY_RESULT, &TimeStart));
        GL_CHECK(glGetQueryObjectui64vEXT(m_QueryStop, GL_QUERY_RESULT, &TimeStop));
    }
    else
        LOGI("disjoint occured");

    LOGI("Time elapsed: %llu, Start: %llu, Stop: %llu", TimeStop-TimeStart, TimeStart, TimeStop); // TimeStart and TimeStop return 0
 

Note: GL_CHECK() just executes the functions and checks for errors (none occured).

Help would be appreciated.

Kind regards