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

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "brw_context.h"
  34 #include "program.h"
  35 #include "program_instruction.h"
  36 #include "macros.h"
  37 #include "brw_vs.h"
  38
  39 /* Component is active if it may diverge from [0,0,0,1].  Undef values
  40  * are promoted to [0,0,0,1] for the purposes of this analysis.
  41  */
  42 struct tracker {
  43    GLboolean twoside;
  44    GLubyte active[PROGRAM_OUTPUT+1][128];
  45    GLuint size_masks[4];
  46 };
  47
  48
  49 static void set_active_component( struct tracker *t,
  50                                   GLuint file,
  51                                   GLuint index,
  52                                   GLubyte active )
  53 {
  54    switch (file) {
  55    case PROGRAM_TEMPORARY:
  56    case PROGRAM_INPUT:
  57    case PROGRAM_OUTPUT:
  58       t->active[file][index] |= active;
  59
  60    default:
  61       break;
  62    }
  63 }
  64
  65 static void set_active( struct tracker *t,
  66                         struct prog_dst_register dst,
  67                         GLuint active )
  68 {
  69    set_active_component( t, dst.File, dst.Index, active & dst.WriteMask );
  70 }
  71
  72
  73 static GLubyte get_active_component( struct tracker *t,
  74                                      GLuint file,
  75                                      GLuint index,
  76                                      GLuint component,
  77                                      GLubyte swz )
  78 {
  79    switch (swz) {
  80    case SWIZZLE_ZERO:
  81       return component < 3 ? 0 : (1<<component);
  82    case SWIZZLE_ONE:
  83       return component == 3 ? 0 : (1<<component);
  84    default:
  85       switch (file) {
  86       case PROGRAM_TEMPORARY:
  87       case PROGRAM_INPUT:
  88       case PROGRAM_OUTPUT:
  89          return t->active[file][index] & (1<<component);
  90       default:
  91          return 1 << component;
  92       }
  93    }
  94 }
  95
  96
  97 static GLubyte get_active( struct tracker *t,
  98                            struct prog_src_register src )
  99 {
 100    GLuint i;
 101    GLubyte active = src.NegateBase; /* NOTE! */
 102
 103    if (src.RelAddr)
 104       return 0xf;
 105
 106    for (i = 0; i < 4; i++)
 107       active |= get_active_component(t, src.File, src.Index, i,
 108                                      GET_SWZ(src.Swizzle, i));
 109
 110    return active;
 111 }
 112
 113 static GLubyte get_output_size( struct tracker *t,
 114                                 GLuint idx )
 115 {
 116    GLubyte active = t->active[PROGRAM_OUTPUT][idx];
 117    if (active & (1<<3)) return 4;
 118    if (active & (1<<2)) return 3;
 119    if (active & (1<<1)) return 2;
 120    if (active & (1<<0)) return 1;
 121    return 0;
 122 }
 123
 124 /* Note the potential copying that occurs in the setup program:
 125  */
 126 static void calc_sizes( struct tracker *t )
 127 {
 128    GLuint i;
 129
 130    if (t->twoside) {
 131       t->active[PROGRAM_OUTPUT][VERT_RESULT_COL0] |=
 132          t->active[PROGRAM_OUTPUT][VERT_RESULT_BFC0];
 133
 134       t->active[PROGRAM_OUTPUT][VERT_RESULT_COL1] |=
 135          t->active[PROGRAM_OUTPUT][VERT_RESULT_BFC1];
 136    }
 137
 138    for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 139       switch (get_output_size(t, i)) {
 140       case 4: t->size_masks[4-1] |= 1<<i;
 141       case 3: t->size_masks[3-1] |= 1<<i;
 142       case 2: t->size_masks[2-1] |= 1<<i;
 143       case 1: t->size_masks[1-1] |= 1<<i;
 144          break;
 145       }
 146    }
 147 }
 148
 149 static GLubyte szflag[4+1] = {
 150    0,
 151    0x1,
 152    0x3,
 153    0x7,
 154    0xf
 155 };
 156
 157 /* Pull a size out of the packed array:
 158  */
 159 static GLuint get_input_size(struct brw_context *brw,
 160                              GLuint attr)
 161 {
 162    GLuint sizes_dword = brw->vb.info.sizes[attr/16];
 163    GLuint sizes_bits = (sizes_dword>>((attr%16)*2)) & 0x3;
 164    return sizes_bits + 1;
 165 }
 166
 167 /* Calculate sizes of vertex program outputs.  Size is the largest
 168  * component index which might vary from [0,0,0,1]
 169  */
 170 static void calc_wm_input_sizes( struct brw_context *brw )
 171 {
 172    /* BRW_NEW_VERTEX_PROGRAM */
 173    struct brw_vertex_program *vp =
 174       (struct brw_vertex_program *)brw->vertex_program;
 175    /* BRW_NEW_INPUT_DIMENSIONS */
 176    struct tracker t;
 177    GLuint insn;
 178    GLuint i;
 179
 180    memset(&t, 0, sizeof(t));
 181
 182    /* _NEW_LIGHT */
 183    if (brw->attribs.Light->Model.TwoSide)
 184       t.twoside = 1;
 185
 186    for (i = 0; i < BRW_ATTRIB_MAX; i++)
 187       if (vp->program.Base.InputsRead & (1<<i))
 188          set_active_component(&t, PROGRAM_INPUT, i,
 189                               szflag[get_input_size(brw, i)]);
 190
 191    for (insn = 0; insn < vp->program.Base.NumInstructions; insn++) {
 192       struct prog_instruction *inst = &vp->program.Base.Instructions[insn];
 193
 194       switch (inst->Opcode) {
 195       case OPCODE_ARL:
 196          break;
 197
 198       case OPCODE_MOV:
 199          set_active(&t, inst->DstReg, get_active(&t, inst->SrcReg[0]));
 200          break;
 201
 202       default:
 203          set_active(&t, inst->DstReg, 0xf);
 204          break;
 205       }
 206    }
 207
 208    calc_sizes(&t);
 209
 210    if (memcmp(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks)) != 0) {
 211       memcpy(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks));
 212       brw->state.dirty.brw |= BRW_NEW_WM_INPUT_DIMENSIONS;
 213    }
 214 }
 215
 216 const struct brw_tracked_state brw_wm_input_sizes = {
 217    .dirty = {
 218       .mesa  = _NEW_LIGHT,
 219       .brw   = BRW_NEW_VERTEX_PROGRAM | BRW_NEW_INPUT_DIMENSIONS,
 220       .cache = 0
 221    },
 222    .update = calc_wm_input_sizes
 223 };
 224