src/mesa/program/prog_parameter.c

   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  * \file prog_parameter.c
  27  * Program parameter lists and functions.
  28  * \author Brian Paul
  29  */
  30
  31
  32 #include "main/glheader.h"
  33 #include "main/imports.h"
  34 #include "main/macros.h"
  35 #include "prog_instruction.h"
  36 #include "prog_parameter.h"
  37 #include "prog_statevars.h"
  38
  39
  40 /**
  41  * Look for a float vector in the given parameter list.  The float vector
  42  * may be of length 1, 2, 3 or 4.  If swizzleOut is non-null, we'll try
  43  * swizzling to find a match.
  44  * \param list  the parameter list to search
  45  * \param v  the float vector to search for
  46  * \param vSize  number of element in v
  47  * \param posOut  returns the position of the constant, if found
  48  * \param swizzleOut  returns a swizzle mask describing location of the
  49  *                    vector elements if found.
  50  * \return GL_TRUE if found, GL_FALSE if not found
  51  */
  52 static GLboolean
  53 lookup_parameter_constant(const struct gl_program_parameter_list *list,
  54                           const gl_constant_value v[], GLuint vSize,
  55                           GLint *posOut, GLuint *swizzleOut)
  56 {
  57    GLuint i;
  58
  59    assert(vSize >= 1);
  60    assert(vSize <= 4);
  61
  62    if (!list) {
  63       *posOut = -1;
  64       return GL_FALSE;
  65    }
  66
  67    for (i = 0; i < list->NumParameters; i++) {
  68       if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
  69          if (!swizzleOut) {
  70             /* swizzle not allowed */
  71             GLuint j, match = 0;
  72             for (j = 0; j < vSize; j++) {
  73                if (v[j].u == list->ParameterValues[i][j].u)
  74                   match++;
  75             }
  76             if (match == vSize) {
  77                *posOut = i;
  78                return GL_TRUE;
  79             }
  80          }
  81          else {
  82             /* try matching w/ swizzle */
  83              if (vSize == 1) {
  84                 /* look for v[0] anywhere within float[4] value */
  85                 GLuint j;
  86                 for (j = 0; j < list->Parameters[i].Size; j++) {
  87                    if (list->ParameterValues[i][j].u == v[0].u) {
  88                       /* found it */
  89                       *posOut = i;
  90                       *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
  91                       return GL_TRUE;
  92                    }
  93                 }
  94              }
  95              else if (vSize <= list->Parameters[i].Size) {
  96                 /* see if we can match this constant (with a swizzle) */
  97                 GLuint swz[4];
  98                 GLuint match = 0, j, k;
  99                 for (j = 0; j < vSize; j++) {
 100                    if (v[j].u == list->ParameterValues[i][j].u) {
 101                       swz[j] = j;
 102                       match++;
 103                    }
 104                    else {
 105                       for (k = 0; k < list->Parameters[i].Size; k++) {
 106                          if (v[j].u == list->ParameterValues[i][k].u) {
 107                             swz[j] = k;
 108                             match++;
 109                             break;
 110                          }
 111                       }
 112                    }
 113                 }
 114                 /* smear last value to remaining positions */
 115                 for (; j < 4; j++)
 116                    swz[j] = swz[j-1];
 117
 118                 if (match == vSize) {
 119                    *posOut = i;
 120                    *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]);
 121                    return GL_TRUE;
 122                 }
 123              }
 124          }
 125       }
 126    }
 127
 128    *posOut = -1;
 129    return GL_FALSE;
 130 }
 131
 132
 133 struct gl_program_parameter_list *
 134 _mesa_new_parameter_list(void)
 135 {
 136    return CALLOC_STRUCT(gl_program_parameter_list);
 137 }
 138
 139
 140 struct gl_program_parameter_list *
 141 _mesa_new_parameter_list_sized(unsigned size)
 142 {
 143    struct gl_program_parameter_list *p = _mesa_new_parameter_list();
 144
 145    if ((p != NULL) && (size != 0)) {
 146       p->Size = size;
 147
 148       /* alloc arrays */
 149       p->Parameters = (struct gl_program_parameter *)
 150          calloc(size, sizeof(struct gl_program_parameter));
 151
 152       p->ParameterValues = (gl_constant_value (*)[4])
 153          _mesa_align_malloc(size * 4 *sizeof(gl_constant_value), 16);
 154
 155
 156       if ((p->Parameters == NULL) || (p->ParameterValues == NULL)) {
 157          free(p->Parameters);
 158          _mesa_align_free(p->ParameterValues);
 159          free(p);
 160          p = NULL;
 161       }
 162    }
 163
 164    return p;
 165 }
 166
 167
 168 /**
 169  * Free a parameter list and all its parameters
 170  */
 171 void
 172 _mesa_free_parameter_list(struct gl_program_parameter_list *paramList)
 173 {
 174    GLuint i;
 175    for (i = 0; i < paramList->NumParameters; i++) {
 176       free((void *)paramList->Parameters[i].Name);
 177    }
 178    free(paramList->Parameters);
 179    _mesa_align_free(paramList->ParameterValues);
 180    free(paramList);
 181 }
 182
 183
 184 /**
 185  * Make sure there are enough unused parameter slots. Reallocate the list
 186  * if needed.
 187  *
 188  * \param paramList        where to reserve parameter slots
 189  * \param reserve_slots    number of slots to reserve
 190  */
 191 void
 192 _mesa_reserve_parameter_storage(struct gl_program_parameter_list *paramList,
 193                                 unsigned reserve_slots)
 194 {
 195    const GLuint oldNum = paramList->NumParameters;
 196
 197    if (oldNum + reserve_slots > paramList->Size) {
 198       /* Need to grow the parameter list array (alloc some extra) */
 199       paramList->Size = paramList->Size + 4 * reserve_slots;
 200
 201       /* realloc arrays */
 202       paramList->Parameters =
 203          realloc(paramList->Parameters,
 204                  paramList->Size * sizeof(struct gl_program_parameter));
 205
 206       paramList->ParameterValues = (gl_constant_value (*)[4])
 207          _mesa_align_realloc(paramList->ParameterValues,         /* old buf */
 208                              oldNum * 4 * sizeof(gl_constant_value),/* old sz */
 209                              paramList->Size*4*sizeof(gl_constant_value),/*new*/
 210                              16);
 211    }
 212 }
 213
 214
 215 /**
 216  * Add a new parameter to a parameter list.
 217  * Note that parameter values are usually 4-element GLfloat vectors.
 218  * When size > 4 we'll allocate a sequential block of parameters to
 219  * store all the values (in blocks of 4).
 220  *
 221  * \param paramList  the list to add the parameter to
 222  * \param type  type of parameter, such as
 223  * \param name  the parameter name, will be duplicated/copied!
 224  * \param size  number of elements in 'values' vector (1..4, or more)
 225  * \param datatype  GL_FLOAT, GL_FLOAT_VECx, GL_INT, GL_INT_VECx or GL_NONE.
 226  * \param values  initial parameter value, up to 4 gl_constant_values, or NULL
 227  * \param state  state indexes, or NULL
 228  * \return  index of new parameter in the list, or -1 if error (out of mem)
 229  */
 230 GLint
 231 _mesa_add_parameter(struct gl_program_parameter_list *paramList,
 232                     gl_register_file type, const char *name,
 233                     GLuint size, GLenum datatype,
 234                     const gl_constant_value *values,
 235                     const gl_state_index16 state[STATE_LENGTH])
 236 {
 237    assert(0 < size && size <=4);
 238    const GLuint oldNum = paramList->NumParameters;
 239
 240    _mesa_reserve_parameter_storage(paramList, 1);
 241
 242    if (!paramList->Parameters ||
 243        !paramList->ParameterValues) {
 244       /* out of memory */
 245       paramList->NumParameters = 0;
 246       paramList->Size = 0;
 247       return -1;
 248    }
 249
 250    paramList->NumParameters = oldNum + 1;
 251
 252    memset(&paramList->Parameters[oldNum], 0,
 253           sizeof(struct gl_program_parameter));
 254
 255    struct gl_program_parameter *p = paramList->Parameters + oldNum;
 256    p->Name = strdup(name ? name : "");
 257    p->Type = type;
 258    p->Size = size;
 259    p->DataType = datatype;
 260
 261    if (values) {
 262       if (size >= 4) {
 263          COPY_4V(paramList->ParameterValues[oldNum], values);
 264       } else {
 265          /* copy 1, 2 or 3 values */
 266          assert(size < 4);
 267          for (unsigned j = 0; j < size; j++) {
 268             paramList->ParameterValues[oldNum][j].f = values[j].f;
 269          }
 270       }
 271    } else {
 272       for (unsigned j = 0; j < 4; j++) {
 273          paramList->ParameterValues[oldNum][j].f = 0;
 274       }
 275    }
 276
 277    if (state) {
 278       for (unsigned i = 0; i < STATE_LENGTH; i++)
 279          paramList->Parameters[oldNum].StateIndexes[i] = state[i];
 280    }
 281
 282    return (GLint) oldNum;
 283 }
 284
 285
 286 /**
 287  * Add a new unnamed constant to the parameter list.  This will be used
 288  * when a fragment/vertex program contains something like this:
 289  *    MOV r, { 0, 1, 2, 3 };
 290  * If swizzleOut is non-null we'll search the parameter list for an
 291  * existing instance of the constant which matches with a swizzle.
 292  *
 293  * \param paramList  the parameter list
 294  * \param values  four float values
 295  * \param swizzleOut  returns swizzle mask for accessing the constant
 296  * \return index/position of the new parameter in the parameter list.
 297  */
 298 GLint
 299 _mesa_add_typed_unnamed_constant(struct gl_program_parameter_list *paramList,
 300                            const gl_constant_value values[4], GLuint size,
 301                            GLenum datatype, GLuint *swizzleOut)
 302 {
 303    GLint pos;
 304    assert(size >= 1);
 305    assert(size <= 4);
 306
 307    if (swizzleOut &&
 308        lookup_parameter_constant(paramList, values, size, &pos, swizzleOut)) {
 309       return pos;
 310    }
 311
 312    /* Look for empty space in an already unnamed constant parameter
 313     * to add this constant.  This will only work for single-element
 314     * constants because we rely on smearing (i.e. .yyyy or .zzzz).
 315     */
 316    if (size == 1 && swizzleOut) {
 317       for (pos = 0; pos < (GLint) paramList->NumParameters; pos++) {
 318          struct gl_program_parameter *p = paramList->Parameters + pos;
 319          if (p->Type == PROGRAM_CONSTANT && p->Size + size <= 4) {
 320             /* ok, found room */
 321             gl_constant_value *pVal = paramList->ParameterValues[pos];
 322             GLuint swz = p->Size; /* 1, 2 or 3 for Y, Z, W */
 323             pVal[p->Size] = values[0];
 324             p->Size++;
 325             *swizzleOut = MAKE_SWIZZLE4(swz, swz, swz, swz);
 326             return pos;
 327          }
 328       }
 329    }
 330
 331    /* add a new parameter to store this constant */
 332    pos = _mesa_add_parameter(paramList, PROGRAM_CONSTANT, NULL,
 333                              size, datatype, values, NULL);
 334    if (pos >= 0 && swizzleOut) {
 335       if (size == 1)
 336          *swizzleOut = SWIZZLE_XXXX;
 337       else
 338          *swizzleOut = SWIZZLE_NOOP;
 339    }
 340    return pos;
 341 }
 342
 343
 344 /**
 345  * Add a new state reference to the parameter list.
 346  * This will be used when the program contains something like this:
 347  *    PARAM ambient = state.material.front.ambient;
 348  *
 349  * \param paramList  the parameter list
 350  * \param stateTokens  an array of 5 (STATE_LENGTH) state tokens
 351  * \return index of the new parameter.
 352  */
 353 GLint
 354 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
 355                           const gl_state_index16 stateTokens[STATE_LENGTH])
 356 {
 357    const GLuint size = 4; /* XXX fix */
 358    char *name;
 359    GLint index;
 360
 361    /* Check if the state reference is already in the list */
 362    for (index = 0; index < (GLint) paramList->NumParameters; index++) {
 363       if (!memcmp(paramList->Parameters[index].StateIndexes,
 364                   stateTokens,
 365                   sizeof(paramList->Parameters[index].StateIndexes))) {
 366          return index;
 367       }
 368    }
 369
 370    name = _mesa_program_state_string(stateTokens);
 371    index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
 372                                size, GL_NONE, NULL, stateTokens);
 373    paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
 374
 375    /* free name string here since we duplicated it in add_parameter() */
 376    free(name);
 377
 378    return index;
 379 }