workbench/libs/mesa/src/gallium/auxiliary/tgsi/tgsi_transform.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * TGSI program transformation utility.
  30  *
  31  * Authors:  Brian Paul
  32  */
  33
  34 #include "util/u_debug.h"
  35
  36 #include "tgsi_transform.h"
  37
  38
  39
  40 static void
  41 emit_instruction(struct tgsi_transform_context *ctx,
  42                  const struct tgsi_full_instruction *inst)
  43 {
  44    uint ti = ctx->ti;
  45
  46    ti += tgsi_build_full_instruction(inst,
  47                                      ctx->tokens_out + ti,
  48                                      ctx->header,
  49                                      ctx->max_tokens_out - ti);
  50    ctx->ti = ti;
  51 }
  52
  53
  54 static void
  55 emit_declaration(struct tgsi_transform_context *ctx,
  56                  const struct tgsi_full_declaration *decl)
  57 {
  58    uint ti = ctx->ti;
  59
  60    ti += tgsi_build_full_declaration(decl,
  61                                      ctx->tokens_out + ti,
  62                                      ctx->header,
  63                                      ctx->max_tokens_out - ti);
  64    ctx->ti = ti;
  65 }
  66
  67
  68 static void
  69 emit_immediate(struct tgsi_transform_context *ctx,
  70                const struct tgsi_full_immediate *imm)
  71 {
  72    uint ti = ctx->ti;
  73
  74    ti += tgsi_build_full_immediate(imm,
  75                                    ctx->tokens_out + ti,
  76                                    ctx->header,
  77                                    ctx->max_tokens_out - ti);
  78    ctx->ti = ti;
  79 }
  80
  81
  82 static void
  83 emit_property(struct tgsi_transform_context *ctx,
  84               const struct tgsi_full_property *prop)
  85 {
  86    uint ti = ctx->ti;
  87
  88    ti += tgsi_build_full_property(prop,
  89                                   ctx->tokens_out + ti,
  90                                   ctx->header,
  91                                   ctx->max_tokens_out - ti);
  92    ctx->ti = ti;
  93 }
  94
  95
  96 /**
  97  * Apply user-defined transformations to the input shader to produce
  98  * the output shader.
  99  * For example, a register search-and-replace operation could be applied
 100  * by defining a transform_instruction() callback that examined and changed
 101  * the instruction src/dest regs.
 102  *
 103  * \return number of tokens emitted
 104  */
 105 int
 106 tgsi_transform_shader(const struct tgsi_token *tokens_in,
 107                       struct tgsi_token *tokens_out,
 108                       uint max_tokens_out,
 109                       struct tgsi_transform_context *ctx)
 110 {
 111    uint procType;
 112
 113    /* input shader */
 114    struct tgsi_parse_context parse;
 115
 116    /* output shader */
 117    struct tgsi_processor *processor;
 118
 119
 120    /**
 121     ** callback context init
 122     **/
 123    ctx->emit_instruction = emit_instruction;
 124    ctx->emit_declaration = emit_declaration;
 125    ctx->emit_immediate = emit_immediate;
 126    ctx->emit_property = emit_property;
 127    ctx->tokens_out = tokens_out;
 128    ctx->max_tokens_out = max_tokens_out;
 129
 130
 131    /**
 132     ** Setup to begin parsing input shader
 133     **/
 134    if (tgsi_parse_init( &parse, tokens_in ) != TGSI_PARSE_OK) {
 135       debug_printf("tgsi_parse_init() failed in tgsi_transform_shader()!\n");
 136       return -1;
 137    }
 138    procType = parse.FullHeader.Processor.Processor;
 139    assert(procType == TGSI_PROCESSOR_FRAGMENT ||
 140           procType == TGSI_PROCESSOR_VERTEX ||
 141           procType == TGSI_PROCESSOR_GEOMETRY);
 142
 143
 144    /**
 145     **  Setup output shader
 146     **/
 147    ctx->header = (struct tgsi_header *)tokens_out;
 148    *ctx->header = tgsi_build_header();
 149
 150    processor = (struct tgsi_processor *) (tokens_out + 1);
 151    *processor = tgsi_build_processor( procType, ctx->header );
 152
 153    ctx->ti = 2;
 154
 155
 156    /**
 157     ** Loop over incoming program tokens/instructions
 158     */
 159    while( !tgsi_parse_end_of_tokens( &parse ) ) {
 160
 161       tgsi_parse_token( &parse );
 162
 163       switch( parse.FullToken.Token.Type ) {
 164       case TGSI_TOKEN_TYPE_INSTRUCTION:
 165          {
 166             struct tgsi_full_instruction *fullinst
 167                = &parse.FullToken.FullInstruction;
 168
 169             if (ctx->transform_instruction)
 170                ctx->transform_instruction(ctx, fullinst);
 171             else
 172                ctx->emit_instruction(ctx, fullinst);
 173          }
 174          break;
 175
 176       case TGSI_TOKEN_TYPE_DECLARATION:
 177          {
 178             struct tgsi_full_declaration *fulldecl
 179                = &parse.FullToken.FullDeclaration;
 180
 181             if (ctx->transform_declaration)
 182                ctx->transform_declaration(ctx, fulldecl);
 183             else
 184                ctx->emit_declaration(ctx, fulldecl);
 185          }
 186          break;
 187
 188       case TGSI_TOKEN_TYPE_IMMEDIATE:
 189          {
 190             struct tgsi_full_immediate *fullimm
 191                = &parse.FullToken.FullImmediate;
 192
 193             if (ctx->transform_immediate)
 194                ctx->transform_immediate(ctx, fullimm);
 195             else
 196                ctx->emit_immediate(ctx, fullimm);
 197          }
 198          break;
 199       case TGSI_TOKEN_TYPE_PROPERTY:
 200          {
 201             struct tgsi_full_property *fullprop
 202                = &parse.FullToken.FullProperty;
 203
 204             if (ctx->transform_property)
 205                ctx->transform_property(ctx, fullprop);
 206             else
 207                ctx->emit_property(ctx, fullprop);
 208          }
 209          break;
 210
 211       default:
 212          assert( 0 );
 213       }
 214    }
 215
 216    if (ctx->epilog) {
 217       ctx->epilog(ctx);
 218    }
 219
 220    tgsi_parse_free (&parse);
 221
 222    return ctx->ti;
 223 }
 224
 225
 226 #include "tgsi_text.h"
 227
 228 extern int tgsi_transform_foo( struct tgsi_token *tokens_out,
 229                                uint max_tokens_out );
 230
 231 /* This function exists only so that tgsi_text_translate() doesn't get
 232  * magic-ed out of the libtgsi.a archive by the build system.  Don't
 233  * remove unless you know this has been fixed - check on mingw/scons
 234  * builds as well.
 235  */
 236 int
 237 tgsi_transform_foo( struct tgsi_token *tokens_out,
 238                     uint max_tokens_out )
 239 {
 240    const char *text =
 241       "FRAG\n"
 242       "DCL IN[0], COLOR, CONSTANT\n"
 243       "DCL OUT[0], COLOR\n"
 244       "  0: MOV OUT[0], IN[0]\n"
 245       "  1: END";
 246
 247    return tgsi_text_translate( text,
 248                                tokens_out,
 249                                max_tokens_out );
 250 }