src/mesa/shader/prog_parameter.c - platform/external/mesa3d - Gitiles

 /*
  * Mesa 3-D graphics library
  * Version:  6.5.2
  *
  * Copyright (C) 1999-2006  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.
  */

 /**
  * \file prog_parameter.c
  * Program parameter lists and functions.
  * \author Brian Paul
  */


 #include "glheader.h"
 #include "imports.h"
 #include "macros.h"
 #include "prog_instruction.h"
 #include "prog_parameter.h"
 #include "prog_statevars.h"


 struct gl_program_parameter_list *
 _mesa_new_parameter_list(void)
 {
    return (struct gl_program_parameter_list *)
       _mesa_calloc(sizeof(struct gl_program_parameter_list));
 }


 /**
  * Free a parameter list and all its parameters
  */
 void
 _mesa_free_parameter_list(struct gl_program_parameter_list *paramList)
 {
    GLuint i;
    for (i = 0; i < paramList->NumParameters; i++) {
       if (paramList->Parameters[i].Name)
 	 _mesa_free((void *) paramList->Parameters[i].Name);
    }
    _mesa_free(paramList->Parameters);
    if (paramList->ParameterValues)
       _mesa_align_free(paramList->ParameterValues);
    _mesa_free(paramList);
 }


 /**
  * Add a new parameter to a parameter list.
  * Note that parameter values are usually 4-element GLfloat vectors.
  * When size > 4 we'll allocate a sequential block of parameters to
  * store all the values (in blocks of 4).
  *
  * \param paramList  the list to add the parameter to
  * \param name  the parameter name, will be duplicated/copied!
  * \param values  initial parameter value, up to 4 GLfloats
  * \param size  number of elements in 'values' vector (1..4, or more)
  * \param type  type of parameter, such as
  * \return  index of new parameter in the list, or -1 if error (out of mem)
  */
 GLint
 _mesa_add_parameter(struct gl_program_parameter_list *paramList,
                     const char *name, const GLfloat *values, GLuint size,
                     enum register_file type)
 {
    const GLuint oldNum = paramList->NumParameters;
    const GLuint sz4 = (size + 3) / 4; /* no. of new param slots needed */

    assert(size > 0);
    assert(size <= 16);  /* XXX anything larger than a matrix??? */

    if (oldNum + sz4 > paramList->Size) {
       /* Need to grow the parameter list array (alloc some extra) */
       paramList->Size = paramList->Size + 4 * sz4;

       /* realloc arrays */
       paramList->Parameters = (struct gl_program_parameter *)
 	 _mesa_realloc(paramList->Parameters,
 		       oldNum * sizeof(struct gl_program_parameter),
 		       paramList->Size * sizeof(struct gl_program_parameter));

       paramList->ParameterValues = (GLfloat (*)[4])
          _mesa_align_realloc(paramList->ParameterValues,         /* old buf */
                              oldNum * 4 * sizeof(GLfloat),      /* old size */
                              paramList->Size * 4 *sizeof(GLfloat), /* new sz */
                              16);
    }

    if (!paramList->Parameters ||
        !paramList->ParameterValues) {
       /* out of memory */
       paramList->NumParameters = 0;
       paramList->Size = 0;
       return -1;
    }
    else {
       GLuint i;

       paramList->NumParameters = oldNum + sz4;

       _mesa_memset(&paramList->Parameters[oldNum], 0,
 		   sz4 * sizeof(struct gl_program_parameter));

       for (i = 0; i < sz4; i++) {
          struct gl_program_parameter *p = paramList->Parameters + oldNum + i;
          p->Name = name ? _mesa_strdup(name) : NULL;
          p->Type = type;
          p->Size = size;
          if (values) {
             COPY_4V(paramList->ParameterValues[oldNum + i], values);
             values += 4;
          }
          size -= 4;
       }
       return (GLint) oldNum;
    }
 }


 /**
  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
  * \return index of the new entry in the parameter list
  */
 GLint
 _mesa_add_named_parameter(struct gl_program_parameter_list *paramList,
                           const char *name, const GLfloat values[4])
 {
    return _mesa_add_parameter(paramList, name, values, 4, PROGRAM_NAMED_PARAM);
 }


 /**
  * Add a new named constant to the parameter list.
  * This will be used when the program contains something like this:
  *    PARAM myVals = { 0, 1, 2, 3 };
  *
  * \param paramList  the parameter list
  * \param name  the name for the constant
  * \param values  four float values
  * \return index/position of the new parameter in the parameter list
  */
 GLint
 _mesa_add_named_constant(struct gl_program_parameter_list *paramList,
                          const char *name, const GLfloat values[4],
                          GLuint size)
 {
 #if 0 /* disable this for now -- we need to save the name! */
    GLint pos;
    GLuint swizzle;
    ASSERT(size == 4); /* XXX future feature */
    /* check if we already have this constant */
    if (_mesa_lookup_parameter_constant(paramList, values, 4, &pos, &swizzle)) {
       return pos;
    }
 #endif
    size = 4; /** XXX fix */
    return _mesa_add_parameter(paramList, name, values, size, PROGRAM_CONSTANT);
 }


 /**
  * Add a new unnamed constant to the parameter list.
  * This will be used when the program contains something like this:
  *    MOV r, { 0, 1, 2, 3 };
  *
  * \param paramList  the parameter list
  * \param values  four float values
  * \param swizzleOut  returns swizzle mask for accessing the constant
  * \return index/position of the new parameter in the parameter list.
  */
 GLint
 _mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
                            const GLfloat values[4], GLuint size,
                            GLuint *swizzleOut)
 {
    GLint pos;
    GLuint swizzle;
    ASSERT(size >= 1);
    ASSERT(size <= 4);
    size = 4; /* XXX temporary */
    /* check if we already have this constant */
    if (_mesa_lookup_parameter_constant(paramList, values,
                                        size, &pos, &swizzle)) {
       return pos;
    }
    return _mesa_add_parameter(paramList, NULL, values, size, PROGRAM_CONSTANT);
 }


 GLint
 _mesa_add_uniform(struct gl_program_parameter_list *paramList,
                   const char *name, GLuint size)
 {
    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_UNIFORM) {
       /* already in list */
       return i;
    }
    else {
       i = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_UNIFORM);
       return i;
    }
 }


 GLint
 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
                   const char *name)
 {
    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
       /* already in list */
       return i;
    }
    else {
       const GLint size = 1;
       i = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_SAMPLER);
       return i;
    }
 }


 GLint
 _mesa_add_varying(struct gl_program_parameter_list *paramList,
                   const char *name, GLuint size)
 {
    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
       /* already in list */
       return i;
    }
    else {
       assert(size == 4);
       i = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_VARYING);
       return i;
    }
 }


 #if 0 /* not used yet */
 /**
  * Returns the number of 4-component registers needed to store a piece
  * of GL state.  For matrices this may be as many as 4 registers,
  * everything else needs
  * just 1 register.
  */
 static GLuint
 sizeof_state_reference(const GLint *stateTokens)
 {
    if (stateTokens[0] == STATE_MATRIX) {
       GLuint rows = stateTokens[4] - stateTokens[3] + 1;
       assert(rows >= 1);
       assert(rows <= 4);
       return rows;
    }
    else {
       return 1;
    }
 }
 #endif


 /**
  * Add a new state reference to the parameter list.
  * This will be used when the program contains something like this:
  *    PARAM ambient = state.material.front.ambient;
  *
  * \param paramList  the parameter list
  * \param state  an array of 6 state tokens
  * \return index of the new parameter.
  */
 GLint
 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
                           const GLint *stateTokens)
 {
    const GLuint size = 4; /* XXX fix */
    const char *name;
    GLint index;

    /* Check if the state reference is already in the list */
    for (index = 0; index < paramList->NumParameters; index++) {
       GLuint i, match = 0;
       for (i = 0; i < 6; i++) {
          if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
             match++;
          }
          else {
             break;
          }
       }
       if (match == 6) {
          /* this state reference is already in the parameter list */
          return index;
       }
    }

    name = _mesa_program_state_string(stateTokens);
    index = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_STATE_VAR);
    if (index >= 0) {
       GLuint i;
       for (i = 0; i < 6; i++) {
          paramList->Parameters[index].StateIndexes[i]
             = (gl_state_index) stateTokens[i];
       }
       paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
    }

    /* free name string here since we duplicated it in add_parameter() */
    _mesa_free((void *) name);

    return index;
 }


 /**
  * Lookup a parameter value by name in the given parameter list.
  * \return pointer to the float[4] values.
  */
 GLfloat *
 _mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
                              GLsizei nameLen, const char *name)
 {
    GLuint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
    if (i < 0)
       return NULL;
    else
       return paramList->ParameterValues[i];
 }


 /**
  * Given a program parameter name, find its position in the list of parameters.
  * \param paramList  the parameter list to search
  * \param nameLen  length of name (in chars).
  *                 If length is negative, assume that name is null-terminated.
  * \param name  the name to search for
  * \return index of parameter in the list.
  */
 GLint
 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
                              GLsizei nameLen, const char *name)
 {
    GLint i;

    if (!paramList)
       return -1;

    if (nameLen == -1) {
       /* name is null-terminated */
       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
          if (paramList->Parameters[i].Name &&
 	     _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
             return i;
       }
    }
    else {
       /* name is not null-terminated, use nameLen */
       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
          if (paramList->Parameters[i].Name &&
 	     _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
             return i;
       }
    }
    return -1;
 }


 /**
  * Look for a float vector in the given parameter list.  The float vector
  * may be of length 1, 2, 3 or 4.
  * \param paramList  the parameter list to search
  * \param v  the float vector to search for
  * \param size  number of element in v
  * \param posOut  returns the position of the constant, if found
  * \param swizzleOut  returns a swizzle mask describing location of the
  *                    vector elements if found
  * \return GL_TRUE if found, GL_FALSE if not found
  */
 GLboolean
 _mesa_lookup_parameter_constant(const struct gl_program_parameter_list *paramList,
                                 const GLfloat v[], GLsizei vSize,
                                 GLint *posOut, GLuint *swizzleOut)
 {
    GLuint i;

    assert(vSize >= 1);
    assert(vSize <= 4);

    if (!paramList)
       return -1;

    for (i = 0; i < paramList->NumParameters; i++) {
       if (paramList->Parameters[i].Type == PROGRAM_CONSTANT) {
          const GLint maxShift = 4 - vSize;
          GLint shift, j;
          for (shift = 0; shift <= maxShift; shift++) {
             GLint matched = 0;
             GLuint swizzle[4];
             swizzle[0] = swizzle[1] = swizzle[2] = swizzle[3] = 0;
             /* XXX we could do out-of-order swizzle matches too, someday */
             for (j = 0; j < vSize; j++) {
                assert(shift + j < 4);
                if (paramList->ParameterValues[i][shift + j] == v[j]) {
                   matched++;
                   swizzle[j] = shift + j;
                   ASSERT(swizzle[j] >= SWIZZLE_X);
                   ASSERT(swizzle[j] <= SWIZZLE_W);
                }
             }
             if (matched == vSize) {
                /* found! */
                *posOut = i;
                *swizzleOut = MAKE_SWIZZLE4(swizzle[0], swizzle[1],
                                            swizzle[2], swizzle[3]);
                return GL_TRUE;
             }
          }
       }
    }

    *posOut = -1;
    return GL_FALSE;
 }


 struct gl_program_parameter_list *
 _mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
 {
    struct gl_program_parameter_list *clone;
    GLuint i;

    clone = _mesa_new_parameter_list();
    if (!clone)
       return NULL;

    /** Not too efficient, but correct */
    for (i = 0; i < list->NumParameters; i++) {
       struct gl_program_parameter *p = list->Parameters + i;
       GLuint size = MIN2(p->Size, 4);
       GLint j = _mesa_add_parameter(clone, p->Name, list->ParameterValues[i],
                                     size, p->Type);
       ASSERT(j >= 0);
       /* copy state indexes */
       if (p->Type == PROGRAM_STATE_VAR) {
          GLint k;
          struct gl_program_parameter *q = clone->Parameters + j;
          for (k = 0; k < 6; k++) {
             q->StateIndexes[k] = p->StateIndexes[k];
          }
       }
       else {
          clone->Parameters[j].Size = p->Size;
       }
    }

    return clone;
 }


 /**
  * Find longest name of any parameter in list.
  */
 GLuint
 _mesa_parameter_longest_name(const struct gl_program_parameter_list *list)
 {
    GLuint i, maxLen = 0;
    if (!list)
       return 0;
    for (i = 0; i < list->NumParameters; i++) {
       GLuint len = _mesa_strlen(list->Parameters[i].Name);
       if (len > maxLen)
          maxLen = len;
    }
    return maxLen;
 }
	/*
	* Mesa 3-D graphics library
	* Version: 6.5.2
	*
	* Copyright (C) 1999-2006 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.
	*/

	/**
	* \file prog_parameter.c
	* Program parameter lists and functions.
	* \author Brian Paul
	*/


	#include "glheader.h"
	#include "imports.h"
	#include "macros.h"
	#include "prog_instruction.h"
	#include "prog_parameter.h"
	#include "prog_statevars.h"


	struct gl_program_parameter_list *
	_mesa_new_parameter_list(void)
	{
	return (struct gl_program_parameter_list *)
	_mesa_calloc(sizeof(struct gl_program_parameter_list));
	}


	/**
	* Free a parameter list and all its parameters
	*/
	void
	_mesa_free_parameter_list(struct gl_program_parameter_list *paramList)
	{
	GLuint i;
	for (i = 0; i < paramList->NumParameters; i++) {
	if (paramList->Parameters[i].Name)
	_mesa_free((void *) paramList->Parameters[i].Name);
	}
	_mesa_free(paramList->Parameters);
	if (paramList->ParameterValues)
	_mesa_align_free(paramList->ParameterValues);
	_mesa_free(paramList);
	}



	/**
	* Add a new parameter to a parameter list.
	* Note that parameter values are usually 4-element GLfloat vectors.
	* When size > 4 we'll allocate a sequential block of parameters to
	* store all the values (in blocks of 4).
	*
	* \param paramList the list to add the parameter to
	* \param name the parameter name, will be duplicated/copied!
	* \param values initial parameter value, up to 4 GLfloats
	* \param size number of elements in 'values' vector (1..4, or more)
	* \param type type of parameter, such as
	* \return index of new parameter in the list, or -1 if error (out of mem)
	*/
	GLint
	_mesa_add_parameter(struct gl_program_parameter_list *paramList,
	const char name, const GLfloat values, GLuint size,
	enum register_file type)
	{
	const GLuint oldNum = paramList->NumParameters;
	const GLuint sz4 = (size + 3) / 4; /* no. of new param slots needed */

	assert(size > 0);
	assert(size <= 16); /* XXX anything larger than a matrix??? */

	if (oldNum + sz4 > paramList->Size) {
	/* Need to grow the parameter list array (alloc some extra) */
	paramList->Size = paramList->Size + 4 * sz4;

	/* realloc arrays */
	paramList->Parameters = (struct gl_program_parameter *)
	_mesa_realloc(paramList->Parameters,
	oldNum * sizeof(struct gl_program_parameter),
	paramList->Size * sizeof(struct gl_program_parameter));

	paramList->ParameterValues = (GLfloat (*)[4])
	_mesa_align_realloc(paramList->ParameterValues, /* old buf */
	oldNum * 4 * sizeof(GLfloat), /* old size */
	paramList->Size * 4 sizeof(GLfloat), / new sz */
	16);
	}

	if (!paramList->Parameters \|\|
	!paramList->ParameterValues) {
	/* out of memory */
	paramList->NumParameters = 0;
	paramList->Size = 0;
	return -1;
	}
	else {
	GLuint i;

	paramList->NumParameters = oldNum + sz4;

	_mesa_memset(&paramList->Parameters[oldNum], 0,
	sz4 * sizeof(struct gl_program_parameter));

	for (i = 0; i < sz4; i++) {
	struct gl_program_parameter *p = paramList->Parameters + oldNum + i;
	p->Name = name ? _mesa_strdup(name) : NULL;
	p->Type = type;
	p->Size = size;
	if (values) {
	COPY_4V(paramList->ParameterValues[oldNum + i], values);
	values += 4;
	}
	size -= 4;
	}
	return (GLint) oldNum;
	}
	}


	/**
	* Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
	* \return index of the new entry in the parameter list
	*/
	GLint
	_mesa_add_named_parameter(struct gl_program_parameter_list *paramList,
	const char *name, const GLfloat values[4])
	{
	return _mesa_add_parameter(paramList, name, values, 4, PROGRAM_NAMED_PARAM);
	}


	/**
	* Add a new named constant to the parameter list.
	* This will be used when the program contains something like this:
	* PARAM myVals = { 0, 1, 2, 3 };
	*
	* \param paramList the parameter list
	* \param name the name for the constant
	* \param values four float values
	* \return index/position of the new parameter in the parameter list
	*/
	GLint
	_mesa_add_named_constant(struct gl_program_parameter_list *paramList,
	const char *name, const GLfloat values[4],
	GLuint size)
	{
	#if 0 /* disable this for now -- we need to save the name! */
	GLint pos;
	GLuint swizzle;
	ASSERT(size == 4); /* XXX future feature */
	/* check if we already have this constant */
	if (_mesa_lookup_parameter_constant(paramList, values, 4, &pos, &swizzle)) {
	return pos;
	}
	#endif
	size = 4; /** XXX fix */
	return _mesa_add_parameter(paramList, name, values, size, PROGRAM_CONSTANT);
	}


	/**
	* Add a new unnamed constant to the parameter list.
	* This will be used when the program contains something like this:
	* MOV r, { 0, 1, 2, 3 };
	*
	* \param paramList the parameter list
	* \param values four float values
	* \param swizzleOut returns swizzle mask for accessing the constant
	* \return index/position of the new parameter in the parameter list.
	*/
	GLint
	_mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
	const GLfloat values[4], GLuint size,
	GLuint *swizzleOut)
	{
	GLint pos;
	GLuint swizzle;
	ASSERT(size >= 1);
	ASSERT(size <= 4);
	size = 4; /* XXX temporary */
	/* check if we already have this constant */
	if (_mesa_lookup_parameter_constant(paramList, values,
	size, &pos, &swizzle)) {
	return pos;
	}
	return _mesa_add_parameter(paramList, NULL, values, size, PROGRAM_CONSTANT);
	}


	GLint
	_mesa_add_uniform(struct gl_program_parameter_list *paramList,
	const char *name, GLuint size)
	{
	GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
	if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_UNIFORM) {
	/* already in list */
	return i;
	}
	else {
	i = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_UNIFORM);
	return i;
	}
	}


	GLint
	_mesa_add_sampler(struct gl_program_parameter_list *paramList,
	const char *name)
	{
	GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
	if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
	/* already in list */
	return i;
	}
	else {
	const GLint size = 1;
	i = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_SAMPLER);
	return i;
	}
	}


	GLint
	_mesa_add_varying(struct gl_program_parameter_list *paramList,
	const char *name, GLuint size)
	{
	GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
	if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
	/* already in list */
	return i;
	}
	else {
	assert(size == 4);
	i = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_VARYING);
	return i;
	}
	}




	#if 0 /* not used yet */
	/**
	* Returns the number of 4-component registers needed to store a piece
	* of GL state. For matrices this may be as many as 4 registers,
	* everything else needs
	* just 1 register.
	*/
	static GLuint
	sizeof_state_reference(const GLint *stateTokens)
	{
	if (stateTokens[0] == STATE_MATRIX) {
	GLuint rows = stateTokens[4] - stateTokens[3] + 1;
	assert(rows >= 1);
	assert(rows <= 4);
	return rows;
	}
	else {
	return 1;
	}
	}
	#endif


	/**
	* Add a new state reference to the parameter list.
	* This will be used when the program contains something like this:
	* PARAM ambient = state.material.front.ambient;
	*
	* \param paramList the parameter list
	* \param state an array of 6 state tokens
	* \return index of the new parameter.
	*/
	GLint
	_mesa_add_state_reference(struct gl_program_parameter_list *paramList,
	const GLint *stateTokens)
	{
	const GLuint size = 4; /* XXX fix */
	const char *name;
	GLint index;

	/* Check if the state reference is already in the list */
	for (index = 0; index < paramList->NumParameters; index++) {
	GLuint i, match = 0;
	for (i = 0; i < 6; i++) {
	if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
	match++;
	}
	else {
	break;
	}
	}
	if (match == 6) {
	/* this state reference is already in the parameter list */
	return index;
	}
	}

	name = _mesa_program_state_string(stateTokens);
	index = _mesa_add_parameter(paramList, name, NULL, size, PROGRAM_STATE_VAR);
	if (index >= 0) {
	GLuint i;
	for (i = 0; i < 6; i++) {
	paramList->Parameters[index].StateIndexes[i]
	= (gl_state_index) stateTokens[i];
	}
	paramList->StateFlags \|= _mesa_program_state_flags(stateTokens);
	}

	/* free name string here since we duplicated it in add_parameter() */
	_mesa_free((void *) name);

	return index;
	}


	/**
	* Lookup a parameter value by name in the given parameter list.
	* \return pointer to the float[4] values.
	*/
	GLfloat *
	_mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
	GLsizei nameLen, const char *name)
	{
	GLuint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
	if (i < 0)
	return NULL;
	else
	return paramList->ParameterValues[i];
	}


	/**
	* Given a program parameter name, find its position in the list of parameters.
	* \param paramList the parameter list to search
	* \param nameLen length of name (in chars).
	* If length is negative, assume that name is null-terminated.
	* \param name the name to search for
	* \return index of parameter in the list.
	*/
	GLint
	_mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
	GLsizei nameLen, const char *name)
	{
	GLint i;

	if (!paramList)
	return -1;

	if (nameLen == -1) {
	/* name is null-terminated */
	for (i = 0; i < (GLint) paramList->NumParameters; i++) {
	if (paramList->Parameters[i].Name &&
	_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
	return i;
	}
	}
	else {
	/* name is not null-terminated, use nameLen */
	for (i = 0; i < (GLint) paramList->NumParameters; i++) {
	if (paramList->Parameters[i].Name &&
	_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
	&& _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
	return i;
	}
	}
	return -1;
	}


	/**
	* Look for a float vector in the given parameter list. The float vector
	* may be of length 1, 2, 3 or 4.
	* \param paramList the parameter list to search
	* \param v the float vector to search for
	* \param size number of element in v
	* \param posOut returns the position of the constant, if found
	* \param swizzleOut returns a swizzle mask describing location of the
	* vector elements if found
	* \return GL_TRUE if found, GL_FALSE if not found
	*/
	GLboolean
	_mesa_lookup_parameter_constant(const struct gl_program_parameter_list *paramList,
	const GLfloat v[], GLsizei vSize,
	GLint posOut, GLuint swizzleOut)
	{
	GLuint i;

	assert(vSize >= 1);
	assert(vSize <= 4);

	if (!paramList)
	return -1;

	for (i = 0; i < paramList->NumParameters; i++) {
	if (paramList->Parameters[i].Type == PROGRAM_CONSTANT) {
	const GLint maxShift = 4 - vSize;
	GLint shift, j;
	for (shift = 0; shift <= maxShift; shift++) {
	GLint matched = 0;
	GLuint swizzle[4];
	swizzle[0] = swizzle[1] = swizzle[2] = swizzle[3] = 0;
	/* XXX we could do out-of-order swizzle matches too, someday */
	for (j = 0; j < vSize; j++) {
	assert(shift + j < 4);
	if (paramList->ParameterValues[i][shift + j] == v[j]) {
	matched++;
	swizzle[j] = shift + j;
	ASSERT(swizzle[j] >= SWIZZLE_X);
	ASSERT(swizzle[j] <= SWIZZLE_W);
	}
	}
	if (matched == vSize) {
	/* found! */
	*posOut = i;
	*swizzleOut = MAKE_SWIZZLE4(swizzle[0], swizzle[1],
	swizzle[2], swizzle[3]);
	return GL_TRUE;
	}
	}
	}
	}

	*posOut = -1;
	return GL_FALSE;
	}


	struct gl_program_parameter_list *
	_mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
	{
	struct gl_program_parameter_list *clone;
	GLuint i;

	clone = _mesa_new_parameter_list();
	if (!clone)
	return NULL;

	/** Not too efficient, but correct */
	for (i = 0; i < list->NumParameters; i++) {
	struct gl_program_parameter *p = list->Parameters + i;
	GLuint size = MIN2(p->Size, 4);
	GLint j = _mesa_add_parameter(clone, p->Name, list->ParameterValues[i],
	size, p->Type);
	ASSERT(j >= 0);
	/* copy state indexes */
	if (p->Type == PROGRAM_STATE_VAR) {
	GLint k;
	struct gl_program_parameter *q = clone->Parameters + j;
	for (k = 0; k < 6; k++) {
	q->StateIndexes[k] = p->StateIndexes[k];
	}
	}
	else {
	clone->Parameters[j].Size = p->Size;
	}
	}

	return clone;
	}


	/**
	* Find longest name of any parameter in list.
	*/
	GLuint
	_mesa_parameter_longest_name(const struct gl_program_parameter_list *list)
	{
	GLuint i, maxLen = 0;
	if (!list)
	return 0;
	for (i = 0; i < list->NumParameters; i++) {
	GLuint len = _mesa_strlen(list->Parameters[i].Name);
	if (len > maxLen)
	maxLen = len;
	}
	return maxLen;
	}