Function unnormalize_coordinate

test_common/harness/imageHelpers.cpp:1988–2066

* Utility function to unnormalized a coordinate given a particular sampler. * * name - the name of the coordinate, used for verbose debugging only * coord - the coordinate requiring unnormalization * offset - an addressing offset to be added to the coordinate * extent - the max value for this coordinate (e.g. width for x) */

 * extent   - the max value for this coordinate (e.g. width for x)
 */
static float unnormalize_coordinate(const char *name, float coord, float offset,
                                    float extent,
                                    cl_addressing_mode addressing_mode,
                                    int verbose)
{
    float ret = 0.0f;

    switch (addressing_mode)
    {
        case CL_ADDRESS_REPEAT:
            ret = RepeatNormalizedAddressFn(coord, static_cast<size_t>(extent));

            if (verbose)
            {
                log_info("\tRepeat filter denormalizes %s (%f) to %f\n", name,
                         coord, ret);
            }

            if (offset != 0.0)
            {
                // Add in the offset, and handle wrapping.
                ret += offset;
                if (ret > extent) ret -= extent;
                if (ret < 0.0) ret += extent;
            }

            if (verbose && offset != 0.0f)
            {
                log_info("\tAddress offset of %f added to get %f\n", offset,
                         ret);
            }
            break;

        case CL_ADDRESS_MIRRORED_REPEAT:
            ret = MirroredRepeatNormalizedAddressFn(
                coord, static_cast<size_t>(extent));

            if (verbose)
            {
                log_info(
                    "\tMirrored repeat filter denormalizes %s (%f) to %f\n",
                    name, coord, ret);
            }

            if (offset != 0.0)
            {
                float temp = ret + offset;
                if (temp > extent) temp = extent - (temp - extent);
                ret = fabsf(temp);
            }

            if (verbose && offset != 0.0f)
            {
                log_info("\tAddress offset of %f added to get %f\n", offset,
                         ret);
            }
            break;