src/mesa/program/prog_instruction.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file prog_instruction.h
  28  *
  29  * Vertex/fragment program instruction datatypes and constants.
  30  *
  31  * \author Brian Paul
  32  * \author Keith Whitwell
  33  * \author Ian Romanick <idr@us.ibm.com>
  34  */
  35
  36
  37 #ifndef PROG_INSTRUCTION_H
  38 #define PROG_INSTRUCTION_H
  39
  40
  41 #include "main/glheader.h"
  42
  43
  44 /**
  45  * Swizzle indexes.
  46  * Do not change!
  47  */
  48 /*@{*/
  49 #define SWIZZLE_X    0
  50 #define SWIZZLE_Y    1
  51 #define SWIZZLE_Z    2
  52 #define SWIZZLE_W    3
  53 #define SWIZZLE_ZERO 4   /**< For SWZ instruction only */
  54 #define SWIZZLE_ONE  5   /**< For SWZ instruction only */
  55 #define SWIZZLE_NIL  7   /**< used during shader code gen (undefined value) */
  56 /*@}*/
  57
  58 #define MAKE_SWIZZLE4(a,b,c,d) (((a)<<0) | ((b)<<3) | ((c)<<6) | ((d)<<9))
  59 #define SWIZZLE_NOOP           MAKE_SWIZZLE4(0,1,2,3)
  60 #define GET_SWZ(swz, idx)      (((swz) >> ((idx)*3)) & 0x7)
  61 #define GET_BIT(msk, idx)      (((msk) >> (idx)) & 0x1)
  62 /** Determine if swz contains SWIZZLE_ZERO/ONE/NIL for any components. */
  63 #define HAS_EXTENDED_SWIZZLE(swz) (swz & 0x924)
  64
  65 #define SWIZZLE_XYZW MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_W)
  66 #define SWIZZLE_XXXX MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_X)
  67 #define SWIZZLE_YYYY MAKE_SWIZZLE4(SWIZZLE_Y, SWIZZLE_Y, SWIZZLE_Y, SWIZZLE_Y)
  68 #define SWIZZLE_ZZZZ MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_Z, SWIZZLE_Z, SWIZZLE_Z)
  69 #define SWIZZLE_WWWW MAKE_SWIZZLE4(SWIZZLE_W, SWIZZLE_W, SWIZZLE_W, SWIZZLE_W)
  70
  71
  72 /**
  73  * Writemask values, 1 bit per component.
  74  */
  75 /*@{*/
  76 #define WRITEMASK_X     0x1
  77 #define WRITEMASK_Y     0x2
  78 #define WRITEMASK_XY    0x3
  79 #define WRITEMASK_Z     0x4
  80 #define WRITEMASK_XZ    0x5
  81 #define WRITEMASK_YZ    0x6
  82 #define WRITEMASK_XYZ   0x7
  83 #define WRITEMASK_W     0x8
  84 #define WRITEMASK_XW    0x9
  85 #define WRITEMASK_YW    0xa
  86 #define WRITEMASK_XYW   0xb
  87 #define WRITEMASK_ZW    0xc
  88 #define WRITEMASK_XZW   0xd
  89 #define WRITEMASK_YZW   0xe
  90 #define WRITEMASK_XYZW  0xf
  91 /*@}*/
  92
  93
  94 /**
  95  * Condition codes
  96  */
  97 /*@{*/
  98 #define COND_GT  1  /**< greater than zero */
  99 #define COND_EQ  2  /**< equal to zero */
 100 #define COND_LT  3  /**< less than zero */
 101 #define COND_UN  4  /**< unordered (NaN) */
 102 #define COND_GE  5  /**< greater than or equal to zero */
 103 #define COND_LE  6  /**< less than or equal to zero */
 104 #define COND_NE  7  /**< not equal to zero */
 105 #define COND_TR  8  /**< always true */
 106 #define COND_FL  9  /**< always false */
 107 /*@}*/
 108
 109
 110 /**
 111  * Instruction precision for GL_NV_fragment_program
 112  */
 113 /*@{*/
 114 #define FLOAT32  0x1
 115 #define FLOAT16  0x2
 116 #define FIXED12  0x4
 117 /*@}*/
 118
 119
 120 /**
 121  * Saturation modes when storing values.
 122  */
 123 /*@{*/
 124 #define SATURATE_OFF            0
 125 #define SATURATE_ZERO_ONE       1
 126 /*@}*/
 127
 128
 129 /**
 130  * Per-component negation masks
 131  */
 132 /*@{*/
 133 #define NEGATE_X    0x1
 134 #define NEGATE_Y    0x2
 135 #define NEGATE_Z    0x4
 136 #define NEGATE_W    0x8
 137 #define NEGATE_XYZ  0x7
 138 #define NEGATE_XYZW 0xf
 139 #define NEGATE_NONE 0x0
 140 /*@}*/
 141
 142
 143 /**
 144  * Program instruction opcodes for vertex, fragment and geometry programs.
 145  */
 146 typedef enum prog_opcode {
 147                      /* ARB_vp   ARB_fp   NV_vp   NV_fp     GLSL */
 148                      /*------------------------------------------*/
 149    OPCODE_NOP = 0,   /*                                      X   */
 150    OPCODE_ABS,       /*   X        X       1.1               X   */
 151    OPCODE_ADD,       /*   X        X       X       X         X   */
 152    OPCODE_ARL,       /*   X                X                 X   */
 153    OPCODE_BGNLOOP,   /*                                     opt  */
 154    OPCODE_BGNSUB,    /*                                     opt  */
 155    OPCODE_BRK,       /*                    2                opt  */
 156    OPCODE_CAL,       /*                    2       2        opt  */
 157    OPCODE_CMP,       /*            X                         X   */
 158    OPCODE_CONT,      /*                                     opt  */
 159    OPCODE_COS,       /*            X       2       X         X   */
 160    OPCODE_DDX,       /*                            X         X   */
 161    OPCODE_DDY,       /*                            X         X   */
 162    OPCODE_DP2,       /*                            2         X   */
 163    OPCODE_DP3,       /*   X        X       X       X         X   */
 164    OPCODE_DP4,       /*   X        X       X       X         X   */
 165    OPCODE_DPH,       /*   X        X       1.1                   */
 166    OPCODE_DST,       /*   X        X       X       X             */
 167    OPCODE_ELSE,      /*                                     opt  */
 168    OPCODE_END,       /*   X        X       X       X        opt  */
 169    OPCODE_ENDIF,     /*                                     opt  */
 170    OPCODE_ENDLOOP,   /*                                     opt  */
 171    OPCODE_ENDSUB,    /*                                     opt  */
 172    OPCODE_EX2,       /*   X        X       2       X         X   */
 173    OPCODE_EXP,       /*   X                X                     */
 174    OPCODE_FLR,       /*   X        X       2       X         X   */
 175    OPCODE_FRC,       /*   X        X       2       X         X   */
 176    OPCODE_IF,        /*                                     opt  */
 177    OPCODE_KIL,       /*            X                         X   */
 178    OPCODE_KIL_NV,    /*                            X         X   */
 179    OPCODE_LG2,       /*   X        X       2       X         X   */
 180    OPCODE_LIT,       /*   X        X       X       X             */
 181    OPCODE_LOG,       /*   X                X                     */
 182    OPCODE_LRP,       /*            X               X             */
 183    OPCODE_MAD,       /*   X        X       X       X         X   */
 184    OPCODE_MAX,       /*   X        X       X       X         X   */
 185    OPCODE_MIN,       /*   X        X       X       X         X   */
 186    OPCODE_MOV,       /*   X        X       X       X         X   */
 187    OPCODE_MUL,       /*   X        X       X       X         X   */
 188    OPCODE_NOISE1,    /*                                      X   */
 189    OPCODE_NOISE2,    /*                                      X   */
 190    OPCODE_NOISE3,    /*                                      X   */
 191    OPCODE_NOISE4,    /*                                      X   */
 192    OPCODE_POW,       /*   X        X               X         X   */
 193    OPCODE_RCP,       /*   X        X       X       X         X   */
 194    OPCODE_RET,       /*                    2       2        opt  */
 195    OPCODE_RSQ,       /*   X        X       X       X         X   */
 196    OPCODE_SCS,       /*            X                         X   */
 197    OPCODE_SEQ,       /*                    2       X         X   */
 198    OPCODE_SGE,       /*   X        X       X       X         X   */
 199    OPCODE_SGT,       /*                    2       X         X   */
 200    OPCODE_SIN,       /*            X       2       X         X   */
 201    OPCODE_SLE,       /*                    2       X         X   */
 202    OPCODE_SLT,       /*   X        X       X       X         X   */
 203    OPCODE_SNE,       /*                    2       X         X   */
 204    OPCODE_SSG,       /*                    2                 X   */
 205    OPCODE_SUB,       /*   X        X       1.1     X         X   */
 206    OPCODE_SWZ,       /*   X        X                         X   */
 207    OPCODE_TEX,       /*            X       3       X         X   */
 208    OPCODE_TXB,       /*            X       3                 X   */
 209    OPCODE_TXD,       /*                            X         X   */
 210    OPCODE_TXL,       /*                    3       2         X   */
 211    OPCODE_TXP,       /*            X                         X   */
 212    OPCODE_TXP_NV,    /*                    3       X             */
 213    OPCODE_TRUNC,     /*                                      X   */
 214    OPCODE_XPD,       /*   X        X                             */
 215    MAX_OPCODE
 216 } gl_inst_opcode;
 217
 218
 219 /**
 220  * Number of bits for the src/dst register Index field.
 221  * This limits the size of temp/uniform register files.
 222  */
 223 #define INST_INDEX_BITS 12
 224
 225
 226 /**
 227  * Instruction source register.
 228  */
 229 struct prog_src_register
 230 {
 231    GLuint File:4;       /**< One of the PROGRAM_* register file values. */
 232    GLint Index:(INST_INDEX_BITS+1); /**< Extra bit here for sign bit.
 233                                      * May be negative for relative addressing.
 234                                      */
 235    GLuint Swizzle:12;
 236    GLuint RelAddr:1;
 237
 238    /** Take the component-wise absolute value */
 239    GLuint Abs:1;
 240
 241    /**
 242     * Post-Abs negation.
 243     * This will either be NEGATE_NONE or NEGATE_XYZW, except for the SWZ
 244     * instruction which allows per-component negation.
 245     */
 246    GLuint Negate:4;
 247
 248    /**
 249     * Is the register two-dimensional.
 250     * Two dimensional registers are of the
 251     * REGISTER[index][index2] format.
 252     * They are used by the geometry shaders where
 253     * the first index is the index within an array
 254     * and the second index is the semantic of the
 255     * array, e.g. gl_PositionIn[index] would become
 256     * INPUT[index][gl_PositionIn]
 257     */
 258    GLuint HasIndex2:1;
 259    GLuint RelAddr2:1;
 260    GLint Index2:(INST_INDEX_BITS+1); /**< Extra bit here for sign bit.
 261                                        * May be negative for relative
 262                                        * addressing. */
 263 };
 264
 265
 266 /**
 267  * Instruction destination register.
 268  */
 269 struct prog_dst_register
 270 {
 271    GLuint File:4;      /**< One of the PROGRAM_* register file values */
 272    GLuint Index:INST_INDEX_BITS;  /**< Unsigned, never negative */
 273    GLuint WriteMask:4;
 274    GLuint RelAddr:1;
 275
 276    /**
 277     * \name Conditional destination update control.
 278     *
 279     * \since
 280     * NV_fragment_program_option, NV_vertex_program2, NV_vertex_program2_option.
 281     */
 282    /*@{*/
 283    /**
 284     * Takes one of the 9 possible condition values (EQ, FL, GT, GE, LE, LT,
 285     * NE, TR, or UN).  Dest reg is only written to if the matching
 286     * (swizzled) condition code value passes.  When a conditional update mask
 287     * is not specified, this will be \c COND_TR.
 288     */
 289    GLuint CondMask:4;
 290
 291    /**
 292     * Condition code swizzle value.
 293     */
 294    GLuint CondSwizzle:12;
 295 };
 296
 297
 298 /**
 299  * Vertex/fragment program instruction.
 300  */
 301 struct prog_instruction
 302 {
 303    gl_inst_opcode Opcode;
 304    struct prog_src_register SrcReg[3];
 305    struct prog_dst_register DstReg;
 306
 307    /**
 308     * Indicates that the instruction should update the condition code
 309     * register.
 310     *
 311     * \since
 312     * NV_fragment_program_option, NV_vertex_program2, NV_vertex_program2_option.
 313     */
 314    GLuint CondUpdate:1;
 315
 316    /**
 317     * If prog_instruction::CondUpdate is \c GL_TRUE, this value selects the
 318     * condition code register that is to be updated.
 319     *
 320     * In GL_NV_fragment_program or GL_NV_vertex_program2 mode, only condition
 321     * code register 0 is available.  In GL_NV_vertex_program3 mode, condition
 322     * code registers 0 and 1 are available.
 323     *
 324     * \since
 325     * NV_fragment_program_option, NV_vertex_program2, NV_vertex_program2_option.
 326     */
 327    GLuint CondDst:1;
 328
 329    /**
 330     * Saturate each value of the vectored result to the range [0,1] or the
 331     * range [-1,1].  \c SSAT mode (i.e., saturation to the range [-1,1]) is
 332     * only available in NV_fragment_program2 mode.
 333     * Value is one of the SATURATE_* tokens.
 334     *
 335     * \since
 336     * NV_fragment_program_option, NV_vertex_program3.
 337     */
 338    GLuint SaturateMode:2;
 339
 340    /**
 341     * Per-instruction selectable precision: FLOAT32, FLOAT16, FIXED12.
 342     *
 343     * \since
 344     * NV_fragment_program_option.
 345     */
 346    GLuint Precision:3;
 347
 348    /**
 349     * \name Extra fields for TEX, TXB, TXD, TXL, TXP instructions.
 350     */
 351    /*@{*/
 352    /** Source texture unit. */
 353    GLuint TexSrcUnit:5;
 354
 355    /** Source texture target, one of TEXTURE_{1D,2D,3D,CUBE,RECT}_INDEX */
 356    GLuint TexSrcTarget:4;
 357
 358    /** True if tex instruction should do shadow comparison */
 359    GLuint TexShadow:1;
 360    /*@}*/
 361
 362    /**
 363     * For BRA and CAL instructions, the location to jump to.
 364     * For BGNLOOP, points to ENDLOOP (and vice-versa).
 365     * For BRK, points to ENDLOOP
 366     * For IF, points to ELSE or ENDIF.
 367     * For ELSE, points to ENDIF.
 368     */
 369    GLint BranchTarget;
 370
 371    /** for driver use (try to remove someday) */
 372    GLint Aux;
 373
 374    /** for debugging purposes */
 375    const char *Comment;
 376 };
 377
 378
 379 #ifdef __cplusplus
 380 extern "C" {
 381 #endif
 382
 383 extern void
 384 _mesa_init_instructions(struct prog_instruction *inst, GLuint count);
 385
 386 extern struct prog_instruction *
 387 _mesa_alloc_instructions(GLuint numInst);
 388
 389 extern struct prog_instruction *
 390 _mesa_copy_instructions(struct prog_instruction *dest,
 391                         const struct prog_instruction *src, GLuint n);
 392
 393 extern void
 394 _mesa_free_instructions(struct prog_instruction *inst, GLuint count);
 395
 396 extern GLuint
 397 _mesa_num_inst_src_regs(gl_inst_opcode opcode);
 398
 399 extern GLuint
 400 _mesa_num_inst_dst_regs(gl_inst_opcode opcode);
 401
 402 extern GLboolean
 403 _mesa_is_tex_instruction(gl_inst_opcode opcode);
 404
 405 extern GLboolean
 406 _mesa_check_soa_dependencies(const struct prog_instruction *inst);
 407
 408 extern const char *
 409 _mesa_opcode_string(gl_inst_opcode opcode);
 410
 411
 412 #ifdef __cplusplus
 413 } /* extern "C" */
 414 #endif
 415
 416 #endif /* PROG_INSTRUCTION_H */