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_QUALIFIER_NONE:          return "none";
  30       case INTERP_QUALIFIER_FLAT:          return "flat";
  31       case INTERP_QUALIFIER_SMOOTH:        return "smooth";
  32       case INTERP_QUALIFIER_NOPERSPECTIVE: return "nopersp";
  33       default:                             return "???";
  34    }
  35 }
  36
  37
  38 /* Set up interpolation modes for every element in the VUE */
  39 static 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    memset(&brw->interpolation_mode, INTERP_QUALIFIER_NONE, sizeof(brw->interpolation_mode));
  46
  47    brw->ctx.NewDriverState |= BRW_NEW_INTERPOLATION_MAP;
  48
  49    if (!fprog)
  50       return;
  51
  52    for (int i = 0; i < vue_map->num_slots; i++) {
  53       int varying = vue_map->slot_to_varying[i];
  54       if (varying == -1)
  55          continue;
  56
  57       /* HPOS always wants noperspective. setting it up here allows
  58        * us to not need special handling in the SF program. */
  59       if (varying == VARYING_SLOT_POS) {
  60          brw->interpolation_mode.mode[i] = INTERP_QUALIFIER_NOPERSPECTIVE;
  61          continue;
  62       }
  63
  64       int frag_attrib = varying;
  65       if (varying == VARYING_SLOT_BFC0 || varying == VARYING_SLOT_BFC1)
  66          frag_attrib = varying - VARYING_SLOT_BFC0 + VARYING_SLOT_COL0;
  67
  68       if (!(fprog->Base.InputsRead & BITFIELD64_BIT(frag_attrib)))
  69          continue;
  70
  71       enum glsl_interp_qualifier mode = fprog->InterpQualifier[frag_attrib];
  72
  73       /* If the mode is not specified, the default varies: Color values
  74        * follow GL_SHADE_MODEL; everything else is smooth.
  75        */
  76       if (mode == INTERP_QUALIFIER_NONE) {
  77          if (frag_attrib == VARYING_SLOT_COL0 || frag_attrib == VARYING_SLOT_COL1)
  78             mode = brw->ctx.Light.ShadeModel == GL_FLAT
  79                ? INTERP_QUALIFIER_FLAT : INTERP_QUALIFIER_SMOOTH;
  80          else
  81             mode = INTERP_QUALIFIER_SMOOTH;
  82       }
  83
  84       brw->interpolation_mode.mode[i] = mode;
  85    }
  86
  87    if (unlikely(INTEL_DEBUG & DEBUG_VUE)) {
  88       fprintf(stderr, "VUE map:\n");
  89       for (int i = 0; i < vue_map->num_slots; i++) {
  90          int varying = vue_map->slot_to_varying[i];
  91          if (varying == -1) {
  92             fprintf(stderr, "%d: --\n", i);
  93             continue;
  94          }
  95
  96          fprintf(stderr, "%d: %d %s ofs %d\n",
  97                  i, varying,
  98                  get_qual_name(brw->interpolation_mode.mode[i]),
  99                  brw_vue_slot_to_offset(i));
 100       }
 101    }
 102 }
 103
 104
 105 const struct brw_tracked_state brw_interpolation_map = {
 106    .dirty = {
 107       .mesa  = _NEW_LIGHT,
 108       .brw   = BRW_NEW_FRAGMENT_PROGRAM |
 109                BRW_NEW_VUE_MAP_GEOM_OUT,
 110    },
 111    .emit = brw_setup_vue_interpolation
 112 };