src/compiler/nir/nir_lower_flatshade.c

   1 /*
   2  * Copyright © 2015 Red Hat
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24
  25 #include "nir.h"
  26 #include "nir_builder.h"
  27
  28 static bool
  29 lower_input(nir_shader *shader, nir_variable *var)
  30 {
  31    if (var->data.interpolation == INTERP_MODE_NONE &&
  32        (var->data.location == VARYING_SLOT_COL0 ||
  33         var->data.location == VARYING_SLOT_COL1 ||
  34         var->data.location == VARYING_SLOT_BFC0 ||
  35         var->data.location == VARYING_SLOT_BFC1))
  36       var->data.interpolation = INTERP_MODE_FLAT;
  37    return true;
  38 }
  39
  40 bool
  41 nir_lower_flatshade(nir_shader *shader)
  42 {
  43    bool progress = false;
  44
  45    nir_foreach_shader_in_variable(var, shader) {
  46       progress |= lower_input(shader, var);
  47    }
  48
  49    return progress;
  50 }