src/mesa/program/program_parse_extra.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 #include <string.h>
  25 #include "main/mtypes.h"
  26 #include "prog_instruction.h"
  27 #include "program_parser.h"
  28
  29
  30 /**
  31  * Extra assembly-level parser routines
  32  *
  33  * \author Ian Romanick <ian.d.romanick@intel.com>
  34  */
  35
  36 int
  37 _mesa_parse_instruction_suffix(const struct asm_parser_state *state,
  38                                const char *suffix,
  39                                struct prog_instruction *inst)
  40 {
  41    inst->Saturate = GL_FALSE;
  42
  43
  44    /* The only possible suffix element is the saturation selector from
  45     * ARB_fragment_program.
  46     */
  47    if (state->mode == ARB_fragment) {
  48       if (strcmp(suffix, "_SAT") == 0) {
  49          inst->Saturate = GL_TRUE;
  50          suffix += 4;
  51       }
  52    }
  53
  54
  55    /* It is an error for all of the suffix string not to be consumed.
  56     */
  57    return suffix[0] == '\0';
  58 }
  59
  60
  61 int
  62 _mesa_ARBvp_parse_option(struct asm_parser_state *state, const char *option)
  63 {
  64    if (strcmp(option, "ARB_position_invariant") == 0) {
  65       state->option.PositionInvariant = 1;
  66       return 1;
  67    }
  68
  69    return 0;
  70 }
  71
  72
  73 int
  74 _mesa_ARBfp_parse_option(struct asm_parser_state *state, const char *option)
  75 {
  76    unsigned fog_option;
  77
  78    /* All of the options currently supported start with "ARB_".  The code is
  79     * currently structured with nested if-statements because eventually options
  80     * that start with "NV_" will be supported.  This structure will result in
  81     * less churn when those options are added.
  82     */
  83    if (strncmp(option, "ARB_", 4) == 0) {
  84       /* Advance the pointer past the "ARB_" prefix.
  85        */
  86       option += 4;
  87
  88
  89       if (strncmp(option, "fog_", 4) == 0) {
  90          option += 4;
  91
  92          if (strcmp(option, "exp") == 0) {
  93             fog_option = OPTION_FOG_EXP;
  94          } else if (strcmp(option, "exp2") == 0) {
  95             fog_option = OPTION_FOG_EXP2;
  96          } else if (strcmp(option, "linear") == 0) {
  97             fog_option = OPTION_FOG_LINEAR;
  98          } else {
  99             /* invalid option */
 100             return 0;
 101          }
 102
 103          if (state->option.Fog == OPTION_NONE) {
 104             state->option.Fog = fog_option;
 105             return 1;
 106          }
 107
 108          /* The ARB_fragment_program specification instructs us to handle
 109           * redundant options in two seemingly contradictory ways:
 110           *
 111           * Section 3.11.4.5.1 says:
 112           * "Only one fog application option may be specified by any given
 113           *  fragment program.  A fragment program that specifies more than one
 114           *  of the program options "ARB_fog_exp", "ARB_fog_exp2", and
 115           *  "ARB_fog_linear", will fail to load."
 116           *
 117           * Issue 27 says:
 118           * "The three mandatory options are ARB_fog_exp, ARB_fog_exp2, and
 119           *  ARB_fog_linear.  As these options are mutually exclusive by
 120           *  nature, specifying more than one is not useful.  If more than one
 121           *  is specified, the last one encountered in the <optionSequence>
 122           *  will be the one to actually modify the execution environment."
 123           *
 124           * We choose to allow programs to specify the same OPTION redundantly,
 125           * but fail to load programs that specify contradictory options.
 126           */
 127          return state->option.Fog == fog_option ? 1 : 0;
 128       } else if (strncmp(option, "precision_hint_", 15) == 0) {
 129          option += 15;
 130
 131          /* The ARB_fragment_program spec, 3.11.4.5.2 says:
 132           *
 133           * "Only one precision control option may be specified by any given
 134           * fragment program.  A fragment program that specifies both the
 135           * "ARB_precision_hint_fastest" and "ARB_precision_hint_nicest"
 136           * program options will fail to load.
 137           */
 138
 139          if (strcmp(option, "nicest") == 0 && state->option.PrecisionHint != OPTION_FASTEST) {
 140             state->option.PrecisionHint = OPTION_NICEST;
 141             return 1;
 142          } else if (strcmp(option, "fastest") == 0 && state->option.PrecisionHint != OPTION_NICEST) {
 143             state->option.PrecisionHint = OPTION_FASTEST;
 144             return 1;
 145          }
 146
 147          return 0;
 148       } else if (strcmp(option, "draw_buffers") == 0) {
 149          /* Don't need to check extension availability because all Mesa-based
 150           * drivers support GL_ARB_draw_buffers.
 151           */
 152          state->option.DrawBuffers = 1;
 153          return 1;
 154       } else if (strcmp(option, "fragment_program_shadow") == 0) {
 155          if (state->ctx->Extensions.ARB_fragment_program_shadow) {
 156             state->option.Shadow = 1;
 157             return 1;
 158          }
 159       } else if (strncmp(option, "fragment_coord_", 15) == 0) {
 160          option += 15;
 161          if (state->ctx->Extensions.ARB_fragment_coord_conventions) {
 162             if (strcmp(option, "origin_upper_left") == 0) {
 163                state->option.OriginUpperLeft = 1;
 164                return 1;
 165             }
 166             else if (strcmp(option, "pixel_center_integer") == 0) {
 167                state->option.PixelCenterInteger = 1;
 168                return 1;
 169             }
 170          }
 171       }
 172    } else if (strncmp(option, "ATI_", 4) == 0) {
 173       option += 4;
 174
 175       if (strcmp(option, "draw_buffers") == 0) {
 176          /* Don't need to check extension availability because all Mesa-based
 177           * drivers support GL_ATI_draw_buffers.
 178           */
 179          state->option.DrawBuffers = 1;
 180          return 1;
 181       }
 182    }
 183
 184    return 0;
 185 }