src/mesa/shader/prog_parameter_layout.c

   1 /*
   2  * Copyright © 2009 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file prog_parameter_layout.c
  26  * \brief Helper functions to layout storage for program parameters
  27  *
  28  * \author Ian Romanick <ian.d.romanick@intel.com>
  29  */
  30
  31 #include "main/mtypes.h"
  32 #include "prog_parameter.h"
  33 #include "prog_parameter_layout.h"
  34 #include "prog_instruction.h"
  35 #include "program_parser.h"
  36
  37 unsigned
  38 _mesa_combine_swizzles(unsigned base, unsigned applied)
  39 {
  40    unsigned swiz = 0;
  41    unsigned i;
  42
  43    for (i = 0; i < 4; i++) {
  44       const unsigned s = GET_SWZ(applied, i);
  45
  46       swiz |= ((s <= SWIZZLE_W) ? GET_SWZ(base, s) : s) << (i * 3);
  47    }
  48
  49    return swiz;
  50 }
  51
  52
  53 /**
  54  * Copy indirect access array from one parameter list to another
  55  *
  56  * \param src   Parameter array copied from
  57  * \param dst   Parameter array copied to
  58  * \param first Index of first element in \c src to copy
  59  * \param count Number of elements to copy
  60  *
  61  * \return
  62  * The location in \c dst of the first element copied from \c src on
  63  * success.  -1 on failure.
  64  *
  65  * \warning
  66  * This function assumes that there is already enough space available in
  67  * \c dst to hold all of the elements that will be copied over.
  68  */
  69 static int
  70 copy_indirect_accessed_array(struct gl_program_parameter_list *src,
  71                              struct gl_program_parameter_list *dst,
  72                              unsigned first, unsigned count)
  73 {
  74    const int base = dst->NumParameters;
  75    unsigned i;
  76    unsigned j;
  77
  78
  79    for (i = first; i < (first + count); i++) {
  80       struct gl_program_parameter *curr = & src->Parameters[i];
  81
  82
  83       if (curr->Type == PROGRAM_CONSTANT) {
  84          j = dst->NumParameters;
  85       } else {
  86          for (j = 0; j < dst->NumParameters; j++) {
  87             if (memcmp(dst->Parameters[j].StateIndexes, curr->StateIndexes,
  88                        sizeof(curr->StateIndexes)) == 0) {
  89                return -1;
  90             }
  91          }
  92       }
  93
  94       assert(j == dst->NumParameters);
  95
  96       memcpy(& dst->Parameters[j], curr,
  97              sizeof(dst->Parameters[j]));
  98       memcpy(dst->ParameterValues[j], src->ParameterValues[i],
  99              sizeof(GLfloat) * 4);
 100       curr->Name = NULL;
 101
 102       dst->NumParameters++;
 103    }
 104
 105    return base;
 106 }
 107
 108
 109 /**
 110  * XXX description???
 111  * \return GL_TRUE for success, GL_FALSE for failure
 112  */
 113 GLboolean
 114 _mesa_layout_parameters(struct asm_parser_state *state)
 115 {
 116    struct gl_program_parameter_list *layout;
 117    struct asm_instruction *inst;
 118    unsigned i;
 119
 120
 121    layout =
 122       _mesa_new_parameter_list_sized(state->prog->Parameters->NumParameters);
 123
 124
 125    /* PASS 1:  Move any parameters that are accessed indirectly from the
 126     * original parameter list to the new parameter list.
 127     */
 128    for (inst = state->inst_head; inst != NULL; inst = inst->next) {
 129       for (i = 0; i < 3; i++) {
 130          if (inst->SrcReg[i].Base.RelAddr) {
 131             /* Only attempt to add the to the new parameter list once.
 132              */
 133             if (!inst->SrcReg[i].Symbol->pass1_done) {
 134                const int new_begin =
 135                   copy_indirect_accessed_array(state->prog->Parameters, layout,
 136                       inst->SrcReg[i].Symbol->param_binding_begin,
 137                       inst->SrcReg[i].Symbol->param_binding_length);
 138
 139                if (new_begin < 0) {
 140                   return GL_FALSE;
 141                }
 142
 143                inst->SrcReg[i].Symbol->param_binding_begin = new_begin;
 144                inst->SrcReg[i].Symbol->pass1_done = 1;
 145             }
 146
 147             /* Previously the Index was just the offset from the parameter
 148              * array.  Now that the base of the parameter array is known, the
 149              * index can be updated to its actual value.
 150              */
 151             inst->Base.SrcReg[i] = inst->SrcReg[i].Base;
 152             inst->Base.SrcReg[i].Index +=
 153                inst->SrcReg[i].Symbol->param_binding_begin;
 154          }
 155       }
 156    }
 157
 158
 159    /* PASS 2:  Move any parameters that are not accessed indirectly from the
 160     * original parameter list to the new parameter list.
 161     */
 162    for (inst = state->inst_head; inst != NULL; inst = inst->next) {
 163       for (i = 0; i < 3; i++) {
 164          const struct gl_program_parameter *p;
 165          const int idx = inst->SrcReg[i].Base.Index;
 166          unsigned swizzle = SWIZZLE_NOOP;
 167
 168
 169          /* All relative addressed operands were processed on the first
 170           * pass.  Just skip them here.
 171           */
 172          if (inst->SrcReg[i].Base.RelAddr) {
 173             continue;
 174          }
 175
 176
 177          if ((inst->SrcReg[i].Base.File <= PROGRAM_VARYING )
 178              || (inst->SrcReg[i].Base.File >= PROGRAM_WRITE_ONLY)) {
 179             continue;
 180          }
 181
 182          inst->Base.SrcReg[i] = inst->SrcReg[i].Base;
 183          p = & state->prog->Parameters->Parameters[idx];
 184
 185          switch (p->Type) {
 186          case PROGRAM_CONSTANT: {
 187             const float *const v =
 188                state->prog->Parameters->ParameterValues[idx];
 189
 190             inst->Base.SrcReg[i].Index =
 191                _mesa_add_unnamed_constant(layout, v, p->Size, & swizzle);
 192
 193             inst->Base.SrcReg[i].Swizzle =
 194                _mesa_combine_swizzles(swizzle, inst->Base.SrcReg[i].Swizzle);
 195             break;
 196          }
 197
 198          case PROGRAM_STATE_VAR:
 199             inst->Base.SrcReg[i].Index =
 200                _mesa_add_state_reference(layout, p->StateIndexes);
 201             break;
 202
 203          default:
 204             break;
 205          }
 206
 207          inst->SrcReg[i].Base.File = p->Type;
 208          inst->Base.SrcReg[i].File = p->Type;
 209       }
 210    }
 211
 212
 213    _mesa_free_parameter_list(state->prog->Parameters);
 214    state->prog->Parameters = layout;
 215
 216    return GL_TRUE;
 217 }