src/gallium/auxiliary/sct/sct.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * 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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_util.h"
  30 #include "pipe/p_state.h"
  31 #include "pipe/p_inlines.h"
  32 #include "sct.h"
  33
  34
  35 struct texture_list
  36 {
  37    struct pipe_texture *texture;
  38    struct texture_list *next;
  39 };
  40
  41
  42
  43 #define MAX_SURFACES  ((PIPE_MAX_COLOR_BUFS) + 1)
  44
  45 struct sct_context
  46 {
  47    const struct pipe_context *context;
  48
  49    /** surfaces the context is drawing into */
  50    struct pipe_surface *surfaces[MAX_SURFACES];
  51
  52    /** currently bound textures */
  53    struct pipe_texture *textures[PIPE_MAX_SAMPLERS];
  54
  55    /** previously bound textures, used but not flushed */
  56    struct texture_list *textures_used;
  57
  58    boolean needs_flush;
  59
  60    struct sct_context *next;
  61 };
  62
  63
  64
  65 struct sct_surface
  66 {
  67    const struct pipe_surface *surface;
  68
  69    /** list of contexts drawing to this surface */
  70    struct sct_context_list *contexts;
  71
  72    struct sct_surface *next;
  73 };
  74
  75
  76
  77 /**
  78  * Find the surface_info for the given pipe_surface
  79  */
  80 static struct sct_surface *
  81 find_surface_info(struct surface_context_tracker *sct,
  82                   const struct pipe_surface *surface)
  83 {
  84    struct sct_surface *si;
  85    for (si = sct->surfaces; si; si = si->next)
  86       if (si->surface == surface)
  87          return si;
  88    return NULL;
  89 }
  90
  91
  92 /**
  93  * As above, but create new surface_info if surface is new.
  94  */
  95 static struct sct_surface *
  96 find_create_surface_info(struct surface_context_tracker *sct,
  97                          const struct pipe_surface *surface)
  98 {
  99    struct sct_surface *si = find_surface_info(sct, surface);
 100    if (si)
 101       return si;
 102
 103    /* alloc new */
 104    si = CALLOC_STRUCT(sct_surface);
 105    if (si) {
 106       si->surface = surface;
 107
 108       /* insert at head */
 109       si->next = sct->surfaces;
 110       sct->surfaces = si;
 111    }
 112
 113    return si;
 114 }
 115
 116
 117 /**
 118  * Find a context_info for the given context.
 119  */
 120 static struct sct_context *
 121 find_context_info(struct surface_context_tracker *sct,
 122                   const struct pipe_context *context)
 123 {
 124    struct sct_context *ci;
 125    for (ci = sct->contexts; ci; ci = ci->next)
 126       if (ci->context == context)
 127          return ci;
 128    return NULL;
 129 }
 130
 131
 132 /**
 133  * As above, but create new context_info if context is new.
 134  */
 135 static struct sct_context *
 136 find_create_context_info(struct surface_context_tracker *sct,
 137                          const struct pipe_context *context)
 138 {
 139    struct sct_context *ci = find_context_info(sct, context);
 140    if (ci)
 141       return ci;
 142
 143    /* alloc new */
 144    ci = CALLOC_STRUCT(sct_context);
 145    if (ci) {
 146       ci->context = context;
 147
 148       /* insert at head */
 149       ci->next = sct->contexts;
 150       sct->contexts = ci;
 151    }
 152
 153    return ci;
 154 }
 155
 156
 157 /**
 158  * Is the context already bound to the surface?
 159  */
 160 static boolean
 161 find_surface_context(const struct sct_surface *si,
 162                      const struct pipe_context *context)
 163 {
 164    const struct sct_context_list *cl;
 165    for (cl = si->contexts; cl; cl = cl->next) {
 166       if (cl->context == context) {
 167          return TRUE;
 168       }
 169    }
 170    return FALSE;
 171 }
 172
 173
 174 /**
 175  * Add a context to the list of contexts associated with a surface.
 176  */
 177 static void
 178 add_context_to_surface(struct sct_surface *si,
 179                        const struct pipe_context *context)
 180 {
 181    struct sct_context_list *cl = CALLOC_STRUCT(sct_context_list);
 182    if (cl) {
 183       cl->context = context;
 184       /* insert at head of list of contexts */
 185       cl->next = si->contexts;
 186       si->contexts = cl;
 187    }
 188 }
 189
 190
 191 /**
 192  * Remove a context from the list of contexts associated with a surface.
 193  */
 194 static void
 195 remove_context_from_surface(struct sct_surface *si,
 196                             const struct pipe_context *context)
 197 {
 198    struct sct_context_list *prev = NULL, *curr, *next;
 199
 200    for (curr = si->contexts; curr; curr = next) {
 201       if (curr->context == context) {
 202          /* remove */
 203          if (prev)
 204             prev->next = curr->next;
 205          else
 206             si->contexts = curr->next;
 207          next = curr->next;
 208          FREE(curr);
 209       }
 210       else {
 211          prev = curr;
 212       }
 213    }
 214 }
 215
 216
 217 /**
 218  * Unbind context from surface.
 219  */
 220 static void
 221 unbind_context_surface(struct surface_context_tracker *sct,
 222                        struct pipe_context *context,
 223                        struct pipe_surface *surface)
 224 {
 225    struct sct_surface *si = find_surface_info(sct, surface);
 226    if (si) {
 227       remove_context_from_surface(si, context);
 228    }
 229 }
 230
 231
 232 /**
 233  * Bind context to a set of surfaces (color + Z).
 234  * Like MakeCurrent().
 235  */
 236 void
 237 sct_bind_surfaces(struct surface_context_tracker *sct,
 238                   struct pipe_context *context,
 239                   uint num_surf,
 240                   struct pipe_surface **surfaces)
 241 {
 242    struct sct_context *ci = find_create_context_info(sct, context);
 243    uint i;
 244
 245    if (!ci) {
 246       return; /* out of memory */
 247    }
 248
 249    /* unbind currently bound surfaces */
 250    for (i = 0; i < MAX_SURFACES; i++) {
 251       if (ci->surfaces[i]) {
 252          unbind_context_surface(sct, context, ci->surfaces[i]);
 253       }
 254    }
 255
 256    /* bind new surfaces */
 257    for (i = 0; i < num_surf; i++) {
 258       struct sct_surface *si = find_create_surface_info(sct, surfaces[i]);
 259       if (!find_surface_context(si, context)) {
 260          add_context_to_surface(si, context);
 261       }
 262    }
 263 }
 264
 265
 266 /**
 267  * Return list of contexts bound to a surface.
 268  */
 269 const struct sct_context_list *
 270 sct_get_surface_contexts(struct surface_context_tracker *sct,
 271                          const struct pipe_surface *surface)
 272 {
 273    const struct sct_surface *si = find_surface_info(sct, surface);
 274    return si->contexts;
 275 }
 276
 277
 278
 279 static boolean
 280 find_texture(const struct sct_context *ci,
 281              const struct pipe_texture *texture)
 282 {
 283    const struct texture_list *tl;
 284
 285    for (tl = ci->textures_used; tl; tl = tl->next) {
 286       if (tl->texture == texture) {
 287          return TRUE;
 288       }
 289    }
 290    return FALSE;
 291 }
 292
 293
 294 /**
 295  * Add the given texture to the context's list of used textures.
 296  */
 297 static void
 298 add_texture_used(struct sct_context *ci,
 299                  struct pipe_texture *texture)
 300 {
 301    if (!find_texture(ci, texture)) {
 302       /* add to list */
 303       struct texture_list *tl = CALLOC_STRUCT(texture_list);
 304       if (tl) {
 305          pipe_texture_reference(&tl->texture, texture);
 306          /* insert at head */
 307          tl->next = ci->textures_used;
 308          ci->textures_used = tl;
 309       }
 310    }
 311 }
 312
 313
 314 /**
 315  * Bind a texture to a rendering context.
 316  */
 317 void
 318 sct_bind_texture(struct surface_context_tracker *sct,
 319                  struct pipe_context *context,
 320                  uint unit,
 321                  struct pipe_texture *tex)
 322 {
 323    struct sct_context *ci = find_context_info(sct, context);
 324
 325    if (ci->textures[unit] != tex) {
 326       /* put texture on the 'used' list */
 327       add_texture_used(ci, tex);
 328       /* bind new */
 329       pipe_texture_reference(&ci->textures[unit], tex);
 330    }
 331 }
 332
 333
 334 /**
 335  * Check if the given texture has been used by the rendering context
 336  * since the last call to sct_flush_textures().
 337  */
 338 boolean
 339 sct_is_texture_used(struct surface_context_tracker *sct,
 340                     const struct pipe_context *context,
 341                     const struct pipe_texture *texture)
 342 {
 343    const struct sct_context *ci = find_context_info(sct, context);
 344    return find_texture(ci, texture);
 345 }
 346
 347
 348 /**
 349  * To be called when the image contents of a texture are changed, such
 350  * as for gl[Copy]TexSubImage().
 351  * XXX this may not be needed
 352  */
 353 void
 354 sct_update_texture(struct pipe_texture *tex)
 355 {
 356
 357 }
 358
 359
 360 /**
 361  * When a scene is flushed/rendered we can release the list of
 362  * used textures.
 363  */
 364 void
 365 sct_flush_textures(struct surface_context_tracker *sct,
 366                    struct pipe_context *context)
 367 {
 368    struct sct_context *ci = find_context_info(sct, context);
 369    struct texture_list *tl, *next;
 370    uint i;
 371
 372    for (tl = ci->textures_used; tl; tl = next) {
 373       next = tl->next;
 374       pipe_texture_release(&tl->texture);
 375       FREE(tl);
 376    }
 377    ci->textures_used = NULL;
 378
 379    /* put the currently bound textures on the 'used' list */
 380    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 381       add_texture_used(ci, ci->textures[i]);
 382    }
 383 }
 384
 385
 386
 387 void
 388 sct_destroy_context(struct surface_context_tracker *sct,
 389                     struct pipe_context *context)
 390 {
 391    /* XXX should we require an unbinding first? */
 392    {
 393       struct sct_surface *si;
 394       for (si = sct->surfaces; si; si = si->next) {
 395          remove_context_from_surface(si, context);
 396       }
 397    }
 398
 399    /* remove context from context_info list */
 400    {
 401       struct sct_context *ci, *next, *prev = NULL;
 402       for (ci = sct->contexts; ci; ci = next) {
 403          next = ci->next;
 404          if (ci->context == context) {
 405             if (prev)
 406                prev->next = ci->next;
 407             else
 408                sct->contexts = ci->next;
 409             FREE(ci);
 410          }
 411          else {
 412             prev = ci;
 413          }
 414       }
 415    }
 416
 417 }
 418
 419
 420 void
 421 sct_destroy_surface(struct surface_context_tracker *sct,
 422                     struct pipe_surface *surface)
 423 {
 424    if (1) {
 425       /* debug/sanity: no context should be bound to surface */
 426       struct sct_context *ci;
 427       uint i;
 428       for (ci = sct->contexts; ci; ci = ci->next) {
 429          for (i = 0; i < MAX_SURFACES; i++) {
 430             assert(ci->surfaces[i] != surface);
 431          }
 432       }
 433    }
 434
 435    /* remove surface from sct_surface list */
 436    {
 437       struct sct_surface *si, *next, *prev = NULL;
 438       for (si = sct->surfaces; si; si = next) {
 439          next = si->next;
 440          if (si->surface == surface) {
 441             /* unlink */
 442             if (prev)
 443                prev->next = si->next;
 444             else
 445                sct->surfaces = si->next;
 446             FREE(si);
 447          }
 448          else {
 449             prev = si;
 450          }
 451       }
 452    }
 453 }