src/mesa/drivers/dri/i965/brw_interpolation_map.c

   1 /*
   2  * Copyright © 2013 Intel Corporation
   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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_state.h"
  25
  26
  27 /* Set up interpolation modes for every element in the VUE */
  28 static void
  29 brw_setup_vue_interpolation(struct brw_context *brw)
  30 {
  31    const struct gl_fragment_program *fprog = brw->fragment_program;
  32    struct brw_vue_map *vue_map = &brw->vue_map_geom_out;
  33
  34    memset(&brw->interpolation_mode, INTERP_QUALIFIER_NONE, sizeof(brw->interpolation_mode));
  35
  36    brw->state.dirty.brw |= BRW_NEW_INTERPOLATION_MAP;
  37
  38    if (!fprog)
  39       return;
  40
  41    for (int i = 0; i < vue_map->num_slots; i++) {
  42       int varying = vue_map->slot_to_varying[i];
  43       if (varying == -1)
  44          continue;
  45
  46       /* HPOS always wants noperspective. setting it up here allows
  47        * us to not need special handling in the SF program. */
  48       if (varying == VARYING_SLOT_POS) {
  49          brw->interpolation_mode.mode[i] = INTERP_QUALIFIER_NOPERSPECTIVE;
  50          continue;
  51       }
  52
  53       int frag_attrib = varying;
  54       if (varying == VARYING_SLOT_BFC0 || varying == VARYING_SLOT_BFC1)
  55          frag_attrib = varying - VARYING_SLOT_BFC0 + VARYING_SLOT_COL0;
  56
  57       if (!(fprog->Base.InputsRead & BITFIELD64_BIT(frag_attrib)))
  58          continue;
  59
  60       enum glsl_interp_qualifier mode = fprog->InterpQualifier[frag_attrib];
  61
  62       /* If the mode is not specified, the default varies: Color values
  63        * follow GL_SHADE_MODEL; everything else is smooth.
  64        */
  65       if (mode == INTERP_QUALIFIER_NONE) {
  66          if (frag_attrib == VARYING_SLOT_COL0 || frag_attrib == VARYING_SLOT_COL1)
  67             mode = brw->ctx.Light.ShadeModel == GL_FLAT
  68                ? INTERP_QUALIFIER_FLAT : INTERP_QUALIFIER_SMOOTH;
  69          else
  70             mode = INTERP_QUALIFIER_SMOOTH;
  71       }
  72
  73       brw->interpolation_mode.mode[i] = mode;
  74    }
  75 }
  76
  77
  78 const struct brw_tracked_state brw_interpolation_map = {
  79    .dirty = {
  80       .mesa  = _NEW_LIGHT,
  81       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
  82                 BRW_NEW_VUE_MAP_GEOM_OUT)
  83    },
  84    .emit = brw_setup_vue_interpolation
  85 };