prog_parameter.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/**
 * Add parameter representing a vertex program attribute.
 * \param size  size of attribute (in floats), may be -1 if unknown
 * \param attrib  the attribute index, or -1 if unknown
 */
GLint
_mesa_add_attribute(struct gl_program_parameter_list *paramList,
                    const char *name, GLint size, GLenum datatype, GLint attrib)
{
   GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
   if (i >= 0) {
      /* replace */
      if (attrib < 0)
         attrib = i;
      paramList->Parameters[i].StateIndexes[0] = attrib;
   }
   else {
      /* add */
      gl_state_index state[STATE_LENGTH];
      state[0] = (gl_state_index) attrib;
      if (size < 0)
         size = 4;
      i = _mesa_add_parameter(paramList, PROGRAM_INPUT, name,
                              size, datatype, NULL, state);
   }
   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 stateTokens  an array of 5 (STATE_LENGTH) state tokens
 * \return index of the new parameter.
 */
GLint
_mesa_add_state_reference(struct gl_program_parameter_list *paramList,
                          const gl_state_index stateTokens[STATE_LENGTH])
{
   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 < (GLint) paramList->NumParameters; index++) {
      GLuint i, match = 0;
      for (i = 0; i < STATE_LENGTH; i++) {
         if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
            match++;
         }
         else {
            break;
         }
      }
      if (match == STATE_LENGTH) {
         /* this state reference is already in the parameter list */
         return index;
      }
   }

   name = _mesa_program_state_string(stateTokens);
   index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
                               size, GL_NONE,
                               NULL, (gl_state_index *) stateTokens);
   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.  If swizzleOut is non-null, we'll try
 * swizzling to find a match.
 * \param list  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 *list,
                                const GLfloat v[], GLuint vSize,
                                GLint *posOut, GLuint *swizzleOut)
{
   GLuint i;

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

   if (!list)
      return -1;

   for (i = 0; i < list->NumParameters; i++) {
      if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
         if (!swizzleOut) {
            /* swizzle not allowed */
            GLuint j, match = 0;
            for (j = 0; j < vSize; j++) {
               if (v[j] == list->ParameterValues[i][j])
                  match++;
            }
            if (match == vSize) {
               *posOut = i;
               return GL_TRUE;
            }
         }
         else {
            /* try matching w/ swizzle */
             if (vSize == 1) {
                /* look for v[0] anywhere within float[4] value */
                GLuint j;
                for (j = 0; j < 4; j++) {
                   if (list->ParameterValues[i][j] == v[0]) {
                      /* found it */
                      *posOut = i;
                      *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
                      return GL_TRUE;
                   }
                }
             }
             else if (vSize <= list->Parameters[i].Size) {
                /* see if we can match this constant (with a swizzle) */
                GLuint swz[4];
                GLuint match = 0, j, k;
                for (j = 0; j < vSize; j++) {
                   if (v[j] == list->ParameterValues[i][j]) {
                      swz[j] = j;
                      match++;
                   }
                   else {
                      for (k = 0; k < list->Parameters[i].Size; k++) {
                         if (v[j] == list->ParameterValues[i][k]) {
                            swz[j] = k;
                            match++;
                            break;
                         }
                      }
                   }
                }
                /* smear last value to remaining positions */
                for (; j < 4; j++)
                   swz[j] = swz[j-1];

                if (match == vSize) {
                   *posOut = i;
                   *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[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;
      struct gl_program_parameter *pCopy;
      GLuint size = MIN2(p->Size, 4);
      GLint j = _mesa_add_parameter(clone, p->Type, p->Name, size, p->DataType,
                                    list->ParameterValues[i], NULL);
      ASSERT(j >= 0);
      pCopy = clone->Parameters + j;
      pCopy->Used = p->Used;
      /* copy state indexes */
      if (p->Type == PROGRAM_STATE_VAR) {
         GLint k;
         for (k = 0; k < STATE_LENGTH; k++) {
            pCopy->StateIndexes[k] = p->StateIndexes[k];
         }
      }
      else {
         clone->Parameters[j].Size = p->Size;
      }
      
   }

   clone->StateFlags = list->StateFlags;

   return clone;
}


/**
 * Return a new parameter list which is listA + listB.
 */
struct gl_program_parameter_list *
_mesa_combine_parameter_lists(const struct gl_program_parameter_list *listA,
                              const struct gl_program_parameter_list *listB)
{
   struct gl_program_parameter_list *list;

   if (listA) {
      list = _mesa_clone_parameter_list(listA);
      if (list && listB) {
         GLuint i;
         for (i = 0; i < listB->NumParameters; i++) {
            struct gl_program_parameter *param = listB->Parameters + i;
            _mesa_add_parameter(list, param->Type, param->Name, param->Size,
                                param->DataType,
                                listB->ParameterValues[i],
                                param->StateIndexes);
         }
      }
   }
   else if (listB) {
      list = _mesa_clone_parameter_list(listB);
   }
   else {
      list = NULL;
   }
   return list;
}



/**
 * Find longest name of all uniform parameters in list.
 */
GLuint
_mesa_longest_parameter_name(const struct gl_program_parameter_list *list,
                             enum register_file type)
{
   GLuint i, maxLen = 0;
   if (!list)
      return 0;
   for (i = 0; i < list->NumParameters; i++) {
      if (list->Parameters[i].Type == type) {
         GLuint len = _mesa_strlen(list->Parameters[i].Name);
         if (len > maxLen)
            maxLen = len;
      }
   }
   return maxLen;
}


/**
 * Count the number of parameters in the last that match the given type.
 */
GLuint
_mesa_num_parameters_of_type(const struct gl_program_parameter_list *list,
                             enum register_file type)
{
   GLuint i, count = 0;
   if (list) {
      for (i = 0; i < list->NumParameters; i++) {
         if (list->Parameters[i].Type == type)
            count++;
      }
   }
   return count;
}