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, j;
  76
  77    for (i = first; i < (first + count); i++) {
  78       struct gl_program_parameter *curr = & src->Parameters[i];
  79
  80       if (curr->Type == PROGRAM_CONSTANT) {
  81          j = dst->NumParameters;
  82       } else {
  83          for (j = 0; j < dst->NumParameters; j++) {
  84             if (memcmp(dst->Parameters[j].StateIndexes, curr->StateIndexes,
  85                        sizeof(curr->StateIndexes)) == 0) {
  86                return -1;
  87             }
  88          }
  89       }
  90
  91       assert(j == dst->NumParameters);
  92
  93       /* copy src parameter [i] to dest parameter [j] */
  94       memcpy(& dst->Parameters[j], curr,
  95              sizeof(dst->Parameters[j]));
  96       memcpy(dst->ParameterValues[j], src->ParameterValues[i],
  97              sizeof(GLfloat) * 4);
  98
  99       /* Pointer to the string name was copied.  Null-out src param name
 100        * to prevent double free later.
 101        */
 102       curr->Name = NULL;
 103
 104       dst->NumParameters++;
 105    }
 106
 107    return base;
 108 }
 109
 110
 111 /**
 112  * XXX description???
 113  * \return GL_TRUE for success, GL_FALSE for failure
 114  */
 115 GLboolean
 116 _mesa_layout_parameters(struct asm_parser_state *state)
 117 {
 118    struct gl_program_parameter_list *layout;
 119    struct asm_instruction *inst;
 120    unsigned i;
 121
 122    layout =
 123       _mesa_new_parameter_list_sized(state->prog->Parameters->NumParameters);
 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    /* PASS 2:  Move any parameters that are not accessed indirectly from the
 159     * original parameter list to the new parameter list.
 160     */
 161    for (inst = state->inst_head; inst != NULL; inst = inst->next) {
 162       for (i = 0; i < 3; i++) {
 163          const struct gl_program_parameter *p;
 164          const int idx = inst->SrcReg[i].Base.Index;
 165          unsigned swizzle = SWIZZLE_NOOP;
 166
 167          /* All relative addressed operands were processed on the first
 168           * pass.  Just skip them here.
 169           */
 170          if (inst->SrcReg[i].Base.RelAddr) {
 171             continue;
 172          }
 173
 174          if ((inst->SrcReg[i].Base.File <= PROGRAM_VARYING )
 175              || (inst->SrcReg[i].Base.File >= PROGRAM_WRITE_ONLY)) {
 176             continue;
 177          }
 178
 179          inst->Base.SrcReg[i] = inst->SrcReg[i].Base;
 180          p = & state->prog->Parameters->Parameters[idx];
 181
 182          switch (p->Type) {
 183          case PROGRAM_CONSTANT: {
 184             const float *const v =
 185                state->prog->Parameters->ParameterValues[idx];
 186
 187             inst->Base.SrcReg[i].Index =
 188                _mesa_add_unnamed_constant(layout, v, p->Size, & swizzle);
 189
 190             inst->Base.SrcReg[i].Swizzle =
 191                _mesa_combine_swizzles(swizzle, inst->Base.SrcReg[i].Swizzle);
 192             break;
 193          }
 194
 195          case PROGRAM_STATE_VAR:
 196             inst->Base.SrcReg[i].Index =
 197                _mesa_add_state_reference(layout, p->StateIndexes);
 198             break;
 199
 200          default:
 201             break;
 202          }
 203
 204          inst->SrcReg[i].Base.File = p->Type;
 205          inst->Base.SrcReg[i].File = p->Type;
 206       }
 207    }
 208
 209    _mesa_free_parameter_list(state->prog->Parameters);
 210    state->prog->Parameters = layout;
 211
 212    return GL_TRUE;
 213 }