Method render_block

tutorials/verify/verify.cpp:5815–5908

    }

    void render_block(size_t i, size_t)
    {
      float rcpWidth = 1.0f/width;
      float rcpHeight = 1.0/height;
      const size_t tileY = i / numTilesX;
	  const size_t tileX = i - tileY * numTilesX;
	  const size_t x0 = tileX * tileSizeX;
	  const size_t x1 = min(x0 + tileSizeX, width);
	  const size_t y0 = tileY * tileSizeY;
	  const size_t y1 = min(y0 + tileSizeY, height);
      
      RTCRayQueryContext context;
      rtcInitRayQueryContext(&context);

      RTCIntersectArguments args;
      rtcInitIntersectArguments(&args);
      args.context = &context;
      args.flags = ((ivariant & VARIANT_COHERENT_INCOHERENT_MASK) == VARIANT_COHERENT) ? RTC_RAY_QUERY_FLAG_COHERENT :  RTC_RAY_QUERY_FLAG_INCOHERENT;

      switch (imode) 
      {
      case MODE_INTERSECT1: 
      {
        for (size_t y=y0; y<y1; y++) {
          for (size_t x=x0; x<x1; x++) {
            RTCRayHit ray = fastMakeRay(zero,Vec3f(float(x)*rcpWidth,1,float(y)*rcpHeight));
            switch (ivariant & VARIANT_INTERSECT_OCCLUDED_MASK) {
            case VARIANT_INTERSECT: rtcIntersect1(*scene,&ray,&args); break;
            case VARIANT_OCCLUDED : rtcOccluded1 (*scene,(RTCRay*)&ray,(RTCOccludedArguments*)&args); break;
            }
          }
        }
        break;
      }
      case MODE_INTERSECT4: 
      {
        for (size_t y=y0; y<y1; y+=2) {
          for (size_t x=x0; x<x1; x+=2) {
            RTCRayHit4 ray4; 
            for (size_t dy=0; dy<2; dy++) {
              for (size_t dx=0; dx<2; dx++) {
                setRay(ray4,2*dy+dx,fastMakeRay(zero,Vec3f(float(x+dx)*rcpWidth,1,float(y+dy)*rcpHeight)));
              }
            }
            __aligned(16) int valid4[4] = { -1,-1,-1,-1 };
            switch (ivariant & VARIANT_INTERSECT_OCCLUDED_MASK) {
            case VARIANT_INTERSECT: rtcIntersect4(valid4,*scene,&ray4,&args); break;
            case VARIANT_OCCLUDED : rtcOccluded4 (valid4,*scene,(RTCRay4*)&ray4,(RTCOccludedArguments*)&args); break;
            }
          }
        }
        break;
      }
      case MODE_INTERSECT8: 
      {
        for (size_t y=y0; y<y1; y+=4) {
          for (size_t x=x0; x<x1; x+=2) {
            RTCRayHit8 ray8;