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 "main/macros.h"
  34 #include "brw_context.h"
  35 #include "brw_vs.h"
  36
  37 /* Component is active if it may diverge from [0,0,0,1].  Undef values
  38  * are promoted to [0,0,0,1] for the purposes of this analysis.
  39  */
  40 struct tracker {
  41    GLboolean twoside;
  42    GLubyte active[PROGRAM_OUTPUT+1][MAX_PROGRAM_TEMPS];
  43    GLbitfield size_masks[4];  /**< one bit per fragment program input attrib */
  44 };
  45
  46
  47 static void set_active_component( struct tracker *t,
  48                                   GLuint file,
  49                                   GLuint index,
  50                                   GLubyte active )
  51 {
  52    switch (file) {
  53    case PROGRAM_TEMPORARY:
  54    case PROGRAM_INPUT:
  55    case PROGRAM_OUTPUT:
  56       assert(file < PROGRAM_OUTPUT + 1);
  57       assert(index < Elements(t->active[0]));
  58       t->active[file][index] |= active;
  59       break;
  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.Negate; /* 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 /**
 114  * Return the size (1,2,3 or 4) of the output/result for VERT_RESULT_idx.
 115  */
 116 static GLubyte get_output_size( struct tracker *t,
 117                                 GLuint idx )
 118 {
 119    GLubyte active;
 120    assert(idx < VERT_RESULT_MAX);
 121    active = t->active[PROGRAM_OUTPUT][idx];
 122    if (active & (1<<3)) return 4;
 123    if (active & (1<<2)) return 3;
 124    if (active & (1<<1)) return 2;
 125    if (active & (1<<0)) return 1;
 126    return 0;
 127 }
 128
 129 /* Note the potential copying that occurs in the setup program:
 130  */
 131 static void calc_sizes( struct tracker *t )
 132 {
 133    GLint vertRes;
 134
 135    if (t->twoside) {
 136       t->active[PROGRAM_OUTPUT][VERT_RESULT_COL0] |=
 137          t->active[PROGRAM_OUTPUT][VERT_RESULT_BFC0];
 138
 139       t->active[PROGRAM_OUTPUT][VERT_RESULT_COL1] |=
 140          t->active[PROGRAM_OUTPUT][VERT_RESULT_BFC1];
 141    }
 142
 143    /* Examine vertex program output sizes to set the size_masks[] info
 144     * which describes the fragment program input sizes.
 145     */
 146    for (vertRes = VERT_RESULT_TEX0; vertRes < VERT_RESULT_MAX; vertRes++) {
 147       GLint fragAttrib;
 148
 149       /* map vertex program output index to fragment program input index */
 150       if (vertRes <= VERT_RESULT_TEX7)
 151          fragAttrib = FRAG_ATTRIB_TEX0 + vertRes - VERT_RESULT_TEX0;
 152       else if (vertRes >= VERT_RESULT_VAR0)
 153          fragAttrib = FRAG_ATTRIB_VAR0 + vertRes - VERT_RESULT_VAR0;
 154       else
 155          continue;
 156       assert(fragAttrib >= FRAG_ATTRIB_TEX0);
 157       assert(fragAttrib <= FRAG_ATTRIB_MAX);
 158
 159       switch (get_output_size(t, vertRes)) {
 160       case 4: t->size_masks[4-1] |= 1 << fragAttrib;
 161       case 3: t->size_masks[3-1] |= 1 << fragAttrib;
 162       case 2: t->size_masks[2-1] |= 1 << fragAttrib;
 163       case 1: t->size_masks[1-1] |= 1 << fragAttrib;
 164          break;
 165       }
 166    }
 167 }
 168
 169 static GLubyte szflag[4+1] = {
 170    0,
 171    0x1,
 172    0x3,
 173    0x7,
 174    0xf
 175 };
 176
 177 /* Pull a size out of the packed array:
 178  */
 179 static GLuint get_input_size(struct brw_context *brw,
 180                              GLuint attr)
 181 {
 182    GLuint sizes_dword = brw->vb.info.sizes[attr/16];
 183    GLuint sizes_bits = (sizes_dword>>((attr%16)*2)) & 0x3;
 184    return sizes_bits + 1;
 185 /*    return brw->vb.inputs[attr].glarray->Size; */
 186 }
 187
 188 /* Calculate sizes of vertex program outputs.  Size is the largest
 189  * component index which might vary from [0,0,0,1]
 190  */
 191 static void calc_wm_input_sizes( struct brw_context *brw )
 192 {
 193    GLcontext *ctx = &brw->intel.ctx;
 194    /* BRW_NEW_VERTEX_PROGRAM */
 195    const struct brw_vertex_program *vp =
 196       brw_vertex_program_const(brw->vertex_program);
 197    /* BRW_NEW_INPUT_DIMENSIONS */
 198    struct tracker t;
 199    GLuint insn;
 200    GLuint i;
 201
 202    memset(&t, 0, sizeof(t));
 203
 204    /* _NEW_LIGHT */
 205    if (ctx->Light.Model.TwoSide)
 206       t.twoside = 1;
 207
 208    for (i = 0; i < VERT_ATTRIB_MAX; i++)
 209       if (vp->program.Base.InputsRead & (1<<i))
 210          set_active_component(&t, PROGRAM_INPUT, i,
 211                               szflag[get_input_size(brw, i)]);
 212
 213    for (insn = 0; insn < vp->program.Base.NumInstructions; insn++) {
 214       struct prog_instruction *inst = &vp->program.Base.Instructions[insn];
 215
 216       switch (inst->Opcode) {
 217       case OPCODE_ARL:
 218          break;
 219
 220       case OPCODE_MOV:
 221          set_active(&t, inst->DstReg, get_active(&t, inst->SrcReg[0]));
 222          break;
 223
 224       default:
 225          set_active(&t, inst->DstReg, 0xf);
 226          break;
 227       }
 228    }
 229
 230    calc_sizes(&t);
 231
 232    if (memcmp(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks)) != 0) {
 233       memcpy(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks));
 234       brw->state.dirty.brw |= BRW_NEW_WM_INPUT_DIMENSIONS;
 235    }
 236 }
 237
 238 const struct brw_tracked_state brw_wm_input_sizes = {
 239    .dirty = {
 240       .mesa  = _NEW_LIGHT,
 241       .brw   = BRW_NEW_VERTEX_PROGRAM | BRW_NEW_INPUT_DIMENSIONS,
 242       .cache = 0
 243    },
 244    .prepare = calc_wm_input_sizes
 245 };
 246