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 #include "compiler/nir/nir.h"
  26
  27 static char const *get_qual_name(int mode)
  28 {
  29    switch (mode) {
  30       case INTERP_MODE_NONE:          return "none";
  31       case INTERP_MODE_FLAT:          return "flat";
  32       case INTERP_MODE_SMOOTH:        return "smooth";
  33       case INTERP_MODE_NOPERSPECTIVE: return "nopersp";
  34       default:                             return "???";
  35    }
  36 }
  37
  38
  39 /* Set up interpolation modes for every element in the VUE */
  40 void
  41 brw_setup_vue_interpolation(struct brw_context *brw)
  42 {
  43    const struct gl_fragment_program *fprog = brw->fragment_program;
  44    struct brw_vue_map *vue_map = &brw->vue_map_geom_out;
  45
  46    if (!brw_state_dirty(brw,
  47                         _NEW_LIGHT,
  48                         BRW_NEW_BLORP |
  49                         BRW_NEW_FRAGMENT_PROGRAM |
  50                         BRW_NEW_VUE_MAP_GEOM_OUT))
  51       return;
  52
  53    memset(&brw->interpolation_mode, INTERP_MODE_NONE, sizeof(brw->interpolation_mode));
  54
  55    brw->ctx.NewDriverState |= BRW_NEW_INTERPOLATION_MAP;
  56
  57    if (!fprog)
  58       return;
  59
  60    for (int i = 0; i < vue_map->num_slots; i++) {
  61       int varying = vue_map->slot_to_varying[i];
  62       if (varying == -1)
  63          continue;
  64
  65       /* HPOS always wants noperspective. setting it up here allows
  66        * us to not need special handling in the SF program. */
  67       if (varying == VARYING_SLOT_POS) {
  68          brw->interpolation_mode.mode[i] = INTERP_MODE_NOPERSPECTIVE;
  69          continue;
  70       }
  71
  72       int frag_attrib = varying;
  73       if (varying == VARYING_SLOT_BFC0 || varying == VARYING_SLOT_BFC1)
  74          frag_attrib = varying - VARYING_SLOT_BFC0 + VARYING_SLOT_COL0;
  75
  76       if (!(fprog->Base.nir->info->inputs_read & BITFIELD64_BIT(frag_attrib)))
  77          continue;
  78
  79       enum glsl_interp_mode mode = fprog->InterpQualifier[frag_attrib];
  80
  81       /* If the mode is not specified, the default varies: Color values
  82        * follow GL_SHADE_MODEL; everything else is smooth.
  83        */
  84       if (mode == INTERP_MODE_NONE) {
  85          if (frag_attrib == VARYING_SLOT_COL0 || frag_attrib == VARYING_SLOT_COL1)
  86             mode = brw->ctx.Light.ShadeModel == GL_FLAT
  87                ? INTERP_MODE_FLAT : INTERP_MODE_SMOOTH;
  88          else
  89             mode = INTERP_MODE_SMOOTH;
  90       }
  91
  92       brw->interpolation_mode.mode[i] = mode;
  93    }
  94
  95    if (unlikely(INTEL_DEBUG & DEBUG_VUE)) {
  96       fprintf(stderr, "VUE map:\n");
  97       for (int i = 0; i < vue_map->num_slots; i++) {
  98          int varying = vue_map->slot_to_varying[i];
  99          if (varying == -1) {
 100             fprintf(stderr, "%d: --\n", i);
 101             continue;
 102          }
 103
 104          fprintf(stderr, "%d: %d %s ofs %d\n",
 105                  i, varying,
 106                  get_qual_name(brw->interpolation_mode.mode[i]),
 107                  brw_vue_slot_to_offset(i));
 108       }
 109    }
 110 }