src/gallium/auxiliary/gallivm/lp_bld_format_query.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
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  16  * of the Software.
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  27
  28 /**
  29  * @file
  30  * Utility functions to make assertions about formats.
  31  *
  32  * This module centralizes most of logic used when determining what algorithm
  33  * is most suitable (i.e., most efficient yet correct) for a given format.
  34  *
  35  * It might be possible to move some of these functions to u_format module,
  36  * but since tiny differences in the format my render it more/less
  37  * appropriate to a given algorithm it is impossible to make any long term
  38  * guarantee about the semantics of these functions.
  39  *
  40  * @author Jose Fonseca <jfonseca@vmware.com>
  41  */
  42
  43
  44 #include "util/u_format.h"
  45
  46 #include "lp_bld_format.h"
  47
  48
  49 /**
  50  * Whether this format is a 4 rgba8 variant
  51  */
  52 boolean
  53 lp_format_is_rgba8(const struct util_format_description *desc)
  54 {
  55    unsigned chan;
  56
  57    if(desc->block.width != 1 ||
  58       desc->block.height != 1 ||
  59       desc->block.bits != 32)
  60       return FALSE;
  61
  62    for(chan = 0; chan < 4; ++chan) {
  63       if(desc->channel[chan].type != UTIL_FORMAT_TYPE_UNSIGNED &&
  64          desc->channel[chan].type != UTIL_FORMAT_TYPE_SIGNED &&
  65          desc->channel[chan].type != UTIL_FORMAT_TYPE_VOID)
  66          return FALSE;
  67       if(desc->channel[chan].size != 8)
  68          return FALSE;
  69    }
  70
  71    return TRUE;
  72 }