Function QueryModifyingEvents

renderdoc/driver/gl/gl_pixelhistory.cpp:890–1000

}

rdcarray<EventUsage> QueryModifyingEvents(WrappedOpenGL *driver, GLPixelHistoryResources &resources,
                                          const rdcarray<EventUsage> &events, int x, int y,
                                          int mipLevel, rdcarray<PixelModification> &history)
{
  GLMarkerRegion region("QueryModifyingEvents");
  rdcarray<EventUsage> modEvents;
  rdcarray<GLuint> occlusionQueries;
  std::set<uint32_t> ignoredEvents;
  occlusionQueries.resize(events.size());
  driver->glGenQueries((GLsizei)occlusionQueries.size(), occlusionQueries.data());

  driver->ReplayLog(0, events[0].eventId, eReplay_WithoutDraw);
  // execute the occlusion queries
  for(size_t i = 0; i < events.size(); i++)
  {
    uint32_t colIdx = getFramebufferColIndex(driver, resources.target);

    bool ignored = false;
    int objectType;
    driver->glGetFramebufferAttachmentParameteriv(
        eGL_DRAW_FRAMEBUFFER, GLenum(eGL_COLOR_ATTACHMENT0 + colIdx),
        eGL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &objectType);
    // Ignore the event if the framebuffer is attached to a different mip level than the one we're
    // interested in
    if(objectType == eGL_TEXTURE && events[i].usage != ResourceUsage::Clear &&
       !isDirectWrite(events[i].usage))
    {
      int attachedMipLevel;
      driver->glGetFramebufferAttachmentParameteriv(
          eGL_DRAW_FRAMEBUFFER, GLenum(eGL_COLOR_ATTACHMENT0 + colIdx),
          eGL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL, &attachedMipLevel);
      if(mipLevel != attachedMipLevel)
      {
        ignoredEvents.insert(events[i].eventId);
        ignored = true;
      }
    }
    if(!ignored && !(events[i].usage == ResourceUsage::Clear || isDirectWrite(events[i].usage)))
    {
      GLRenderState state;
      state.FetchState(driver);

      GLint currentProgram = 0;
      driver->glGetIntegerv(eGL_CURRENT_PROGRAM, &currentProgram);

      if(!IsGLES)
        driver->glEnable(eGL_DEPTH_CLAMP);
      if(HasExt[EXT_depth_bounds_test])
        driver->glDisable(eGL_DEPTH_BOUNDS_TEST_EXT);
      driver->glDisable(eGL_DEPTH_TEST);
      driver->glDisable(eGL_STENCIL_TEST);
      driver->glDisable(eGL_CULL_FACE);
      driver->glDisable(eGL_SAMPLE_MASK);
      driver->glEnable(eGL_SCISSOR_TEST);
      driver->glScissor(x, y, 1, 1);
      driver->glUseProgram(GetFixedColProgram(driver, driver->GetReplay(), resources, currentProgram));

      driver->SetFetchCounters(true);