/*
 * Mesa 3-D graphics library
 * Version:  6.5.3
 *
 * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


#include "glheader.h"
#include "imports.h"
#include "mtypes.h"
#include "prog_instruction.h"


/**
 * Initialize program instruction fields to defaults.
 * \param inst  first instruction to initialize
 * \param count  number of instructions to initialize
 */
void
_mesa_init_instructions(struct prog_instruction *inst, GLuint count)
{
   GLuint i;

   _mesa_bzero(inst, count * sizeof(struct prog_instruction));

   for (i = 0; i < count; i++) {
      inst[i].SrcReg[0].File = PROGRAM_UNDEFINED;
      inst[i].SrcReg[0].Swizzle = SWIZZLE_NOOP;
      inst[i].SrcReg[1].File = PROGRAM_UNDEFINED;
      inst[i].SrcReg[1].Swizzle = SWIZZLE_NOOP;
      inst[i].SrcReg[2].File = PROGRAM_UNDEFINED;
      inst[i].SrcReg[2].Swizzle = SWIZZLE_NOOP;

      inst[i].DstReg.File = PROGRAM_UNDEFINED;
      inst[i].DstReg.WriteMask = WRITEMASK_XYZW;
      inst[i].DstReg.CondMask = COND_TR;
      inst[i].DstReg.CondSwizzle = SWIZZLE_NOOP;

      inst[i].SaturateMode = SATURATE_OFF;
      inst[i].Precision = FLOAT32;
   }
}


/**
 * Allocate an array of program instructions.
 * \param numInst  number of instructions
 * \return pointer to instruction memory
 */
struct prog_instruction *
_mesa_alloc_instructions(GLuint numInst)
{
   return (struct prog_instruction *)
      _mesa_calloc(numInst * sizeof(struct prog_instruction));
}


/**
 * Reallocate memory storing an array of program instructions.
 * This is used when we need to append additional instructions onto an
 * program.
 * \param oldInst  pointer to first of old/src instructions
 * \param numOldInst  number of instructions at <oldInst>
 * \param numNewInst  desired size of new instruction array.
 * \return  pointer to start of new instruction array.
 */
struct prog_instruction *
_mesa_realloc_instructions(struct prog_instruction *oldInst,
                           GLuint numOldInst, GLuint numNewInst)
{
   struct prog_instruction *newInst;

   newInst = (struct prog_instruction *)
      _mesa_realloc(oldInst,
                    numOldInst * sizeof(struct prog_instruction),
                    numNewInst * sizeof(struct prog_instruction));

   return newInst;
}


/**
 * Copy an array of program instructions.
 * \param dest  pointer to destination.
 * \param src  pointer to source.
 * \param n  number of instructions to copy.
 * \return pointer to destination.
 */
struct prog_instruction *
_mesa_copy_instructions(struct prog_instruction *dest,
                        const struct prog_instruction *src, GLuint n)
{
   GLuint i;
   _mesa_memcpy(dest, src, n * sizeof(struct prog_instruction));
   for (i = 0; i < n; i++) {
      if (src[i].Comment)
         dest[i].Comment = _mesa_strdup(src[i].Comment);
   }
   return dest;
}


/**
 * Basic info about each instruction
 */
struct instruction_info
{
   gl_inst_opcode Opcode;
   const char *Name;
   GLuint NumSrcRegs;
};

/**
 * Instruction info
 * \note Opcode should equal array index!
 */
static const struct instruction_info InstInfo[MAX_OPCODE] = {
   { OPCODE_NOP,    "NOP",   0 },
   { OPCODE_ABS,    "ABS",   1 },
   { OPCODE_ADD,    "ADD",   2 },
   { OPCODE_ARA,    "ARA",   1 },
   { OPCODE_ARL,    "ARL",   1 },
   { OPCODE_ARL_NV, "ARL",   1 },
   { OPCODE_ARR,    "ARL",   1 },
   { OPCODE_BGNLOOP,"BGNLOOP", 0 },
   { OPCODE_BGNSUB, "BGNSUB", 0 },
   { OPCODE_BRA,    "BRA",   0 },
   { OPCODE_BRK,    "BRK",   0 },
   { OPCODE_CAL,    "CAL",   0 },
   { OPCODE_CMP,    "CMP",   3 },
   { OPCODE_CONT,   "CONT",  0 },
   { OPCODE_COS,    "COS",   1 },
   { OPCODE_DDX,    "DDX",   1 },
   { OPCODE_DDY,    "DDY",   1 },
   { OPCODE_DP3,    "DP3",   2 },
   { OPCODE_DP4,    "DP4",   2 },
   { OPCODE_DPH,    "DPH",   2 },
   { OPCODE_DST,    "DST",   2 },
   { OPCODE_ELSE,   "ELSE",  0 },
   { OPCODE_END,    "END",   0 },
   { OPCODE_ENDIF,  "ENDIF", 0 },
   { OPCODE_ENDLOOP,"ENDLOOP", 0 },
   { OPCODE_ENDSUB, "ENDSUB", 0 },
   { OPCODE_EX2,    "EX2",   1 },
   { OPCODE_EXP,    "EXP",   1 },
   { OPCODE_FLR,    "FLR",   1 },
   { OPCODE_FRC,    "FRC",   1 },
   { OPCODE_IF,     "IF",    0 },
   { OPCODE_INT,    "INT",   1 },
   { OPCODE_KIL,    "KIL",   1 },
   { OPCODE_KIL_NV, "KIL",   0 },
   { OPCODE_LG2,    "LG2",   1 },
   { OPCODE_LIT,    "LIT",   1 },
   { OPCODE_LOG,    "LOG",   1 },
   { OPCODE_LRP,    "LRP",   3 },
   { OPCODE_MAD,    "MAD",   3 },
   { OPCODE_MAX,    "MAX",   2 },
   { OPCODE_MIN,    "MIN",   2 },
   { OPCODE_MOV,    "MOV",   1 },
   { OPCODE_MUL,    "MUL",   2 },
   { OPCODE_NOISE1, "NOISE1", 1 },
   { OPCODE_NOISE2, "NOISE2", 1 },
   { OPCODE_NOISE3, "NOISE3", 1 },
   { OPCODE_NOISE4, "NOISE4", 1 },
   { OPCODE_PK2H,   "PK2H",  1 },
   { OPCODE_PK2US,  "PK2US", 1 },
   { OPCODE_PK4B,   "PK4B",  1 },
   { OPCODE_PK4UB,  "PK4UB", 1 },
   { OPCODE_POW,    "POW",   2 },
   { OPCODE_POPA,   "POPA",  0 },
   { OPCODE_PRINT,  "PRINT", 1 },
   { OPCODE_PUSHA,  "PUSHA", 0 },
   { OPCODE_RCC,    "RCC",   1 },
   { OPCODE_RCP,    "RCP",   1 },
   { OPCODE_RET,    "RET",   0 },
   { OPCODE_RFL,    "RFL",   1 },
   { OPCODE_RSQ,    "RSQ",   1 },
   { OPCODE_SCS,    "SCS",   1 },
   { OPCODE_SEQ,    "SEQ",   2 },
   { OPCODE_SFL,    "SFL",   0 },
   { OPCODE_SGE,    "SGE",   2 },
   { OPCODE_SGT,    "SGT",   2 },
   { OPCODE_SIN,    "SIN",   1 },
   { OPCODE_SLE,    "SLE",   2 },
   { OPCODE_SLT,    "SLT",   2 },
   { OPCODE_SNE,    "SNE",   2 },
   { OPCODE_SSG,    "SSG",   1 },
   { OPCODE_STR,    "STR",   0 },
   { OPCODE_SUB,    "SUB",   2 },
   { OPCODE_SWZ,    "SWZ",   1 },
   { OPCODE_TEX,    "TEX",   1 },
   { OPCODE_TXB,    "TXB",   1 },
   { OPCODE_TXD,    "TXD",   3 },
   { OPCODE_TXL,    "TXL",   1 },
   { OPCODE_TXP,    "TXP",   1 },
   { OPCODE_TXP_NV, "TXP",   1 },
   { OPCODE_UP2H,   "UP2H",  1 },
   { OPCODE_UP2US,  "UP2US", 1 },
   { OPCODE_UP4B,   "UP4B",  1 },
   { OPCODE_UP4UB,  "UP4UB", 1 },
   { OPCODE_X2D,    "X2D",   3 },
   { OPCODE_XPD,    "XPD",   2 }
};


/**
 * Return the number of src registers for the given instruction/opcode.
 */
GLuint
_mesa_num_inst_src_regs(gl_inst_opcode opcode)
{
   ASSERT(opcode == InstInfo[opcode].Opcode);
   ASSERT(OPCODE_XPD == InstInfo[OPCODE_XPD].Opcode);
   return InstInfo[opcode].NumSrcRegs;
}


/**
 * Return string name for given program opcode.
 */
const char *
_mesa_opcode_string(gl_inst_opcode opcode)
{
   ASSERT(opcode < MAX_OPCODE);
   return InstInfo[opcode].Name;
}