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