src/gallium/state_trackers/python/p_context.i

   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  * @file
  30  * SWIG interface definion for Gallium types.
  31  *
  32  * @author Jose Fonseca <jrfonseca@tungstengraphics.com>
  33  */
  34
  35 %nodefaultctor st_context;
  36 %nodefaultdtor st_context;
  37
  38 struct st_context {
  39 };
  40
  41 %extend st_context {
  42
  43    ~st_context() {
  44       st_context_destroy($self);
  45    }
  46
  47    /*
  48     * State functions (create/bind/destroy state objects)
  49     */
  50
  51    void set_blend( const struct pipe_blend_state *state ) {
  52       cso_set_blend($self->cso, state);
  53    }
  54
  55    void set_fragment_sampler( unsigned index, const struct pipe_sampler_state *state ) {
  56       cso_single_sampler($self->cso, index, state);
  57       cso_single_sampler_done($self->cso);
  58    }
  59
  60    void set_vertex_sampler( unsigned index, const struct pipe_sampler_state *state ) {
  61       cso_single_vertex_sampler($self->cso, index, state);
  62       cso_single_vertex_sampler_done($self->cso);
  63    }
  64
  65    void set_rasterizer( const struct pipe_rasterizer_state *state ) {
  66       cso_set_rasterizer($self->cso, state);
  67    }
  68
  69    void set_depth_stencil_alpha(const struct pipe_depth_stencil_alpha_state *state) {
  70       cso_set_depth_stencil_alpha($self->cso, state);
  71    }
  72
  73    void set_fragment_shader( const struct pipe_shader_state *state ) {
  74       void *fs;
  75
  76       if(!state) {
  77          cso_set_fragment_shader_handle($self->cso, NULL);
  78          return;
  79       }
  80
  81       fs = $self->pipe->create_fs_state($self->pipe, state);
  82       if(!fs)
  83          return;
  84
  85       if(cso_set_fragment_shader_handle($self->cso, fs) != PIPE_OK)
  86          return;
  87
  88       cso_delete_fragment_shader($self->cso, $self->fs);
  89       $self->fs = fs;
  90    }
  91
  92    void set_vertex_shader( const struct pipe_shader_state *state ) {
  93       void *vs;
  94
  95       if(!state) {
  96          cso_set_vertex_shader_handle($self->cso, NULL);
  97          return;
  98       }
  99
 100       vs = $self->pipe->create_vs_state($self->pipe, state);
 101       if(!vs)
 102          return;
 103
 104       if(cso_set_vertex_shader_handle($self->cso, vs) != PIPE_OK)
 105          return;
 106
 107       cso_delete_vertex_shader($self->cso, $self->vs);
 108       $self->vs = vs;
 109    }
 110
 111    void set_geometry_shader( const struct pipe_shader_state *state ) {
 112       void *gs;
 113
 114       if(!state) {
 115          cso_set_geometry_shader_handle($self->cso, NULL);
 116          return;
 117       }
 118
 119       gs = $self->pipe->create_gs_state($self->pipe, state);
 120       if(!gs)
 121          return;
 122
 123       if(cso_set_geometry_shader_handle($self->cso, gs) != PIPE_OK)
 124          return;
 125
 126       cso_delete_geometry_shader($self->cso, $self->gs);
 127       $self->gs = gs;
 128    }
 129
 130    struct pipe_sampler_view *
 131    create_sampler_view(struct pipe_resource *texture,
 132                        enum pipe_format format = PIPE_FORMAT_NONE,
 133                        unsigned first_level = 0,
 134                        unsigned last_level = ~0,
 135                        unsigned first_layer = 0,
 136                        unsigned last_layer = ~0,
 137                        unsigned swizzle_r = 0,
 138                        unsigned swizzle_g = 1,
 139                        unsigned swizzle_b = 2,
 140                        unsigned swizzle_a = 3)
 141    {
 142       struct pipe_context *pipe = $self->pipe;
 143       struct pipe_sampler_view templat;
 144
 145       memset(&templat, 0, sizeof templat);
 146       if (format == PIPE_FORMAT_NONE) {
 147          templat.format = texture->format;
 148       } else {
 149          templat.format = format;
 150       }
 151       templat.u.tex.last_level = MIN2(last_level, texture->last_level);
 152       templat.u.tex.first_level = first_level;
 153       templat.u.tex.first_layer = first_layer;
 154       templat.u.tex.last_layer = last_layer;
 155       templat.swizzle_r = swizzle_r;
 156       templat.swizzle_g = swizzle_g;
 157       templat.swizzle_b = swizzle_b;
 158       templat.swizzle_a = swizzle_a;
 159
 160       return pipe->create_sampler_view(pipe, texture, &templat);
 161    }
 162
 163    void
 164    sampler_view_destroy(struct pipe_context *ctx,
 165                         struct pipe_sampler_view *view)
 166    {
 167       struct pipe_context *pipe = $self->pipe;
 168
 169       pipe->sampler_view_destroy(pipe, view);
 170    }
 171
 172    /*
 173     * Parameter-like state (or properties)
 174     */
 175
 176    void set_blend_color(const struct pipe_blend_color *state ) {
 177       cso_set_blend_color($self->cso, state);
 178    }
 179
 180    void set_stencil_ref(const struct pipe_stencil_ref *state ) {
 181       cso_set_stencil_ref($self->cso, state);
 182    }
 183
 184    void set_clip(const struct pipe_clip_state *state ) {
 185       $self->pipe->set_clip_state($self->pipe, state);
 186    }
 187
 188    void set_constant_buffer(unsigned shader, unsigned index,
 189                             struct pipe_resource *buffer )
 190    {
 191       $self->pipe->set_constant_buffer($self->pipe, shader, index, buffer);
 192    }
 193
 194    void set_framebuffer(const struct pipe_framebuffer_state *state )
 195    {
 196       memcpy(&$self->framebuffer, state, sizeof *state);
 197       cso_set_framebuffer($self->cso, state);
 198    }
 199
 200    void set_polygon_stipple(const struct pipe_poly_stipple *state ) {
 201       $self->pipe->set_polygon_stipple($self->pipe, state);
 202    }
 203
 204    void set_scissor(const struct pipe_scissor_state *state ) {
 205       $self->pipe->set_scissor_state($self->pipe, state);
 206    }
 207
 208    void set_viewport(const struct pipe_viewport_state *state) {
 209       cso_set_viewport($self->cso, state);
 210    }
 211
 212    void set_fragment_sampler_view(unsigned index,
 213                                   struct pipe_sampler_view *view)
 214    {
 215       pipe_sampler_view_reference(&$self->fragment_sampler_views[index], view);
 216
 217       $self->pipe->set_fragment_sampler_views($self->pipe,
 218                                               PIPE_MAX_SAMPLERS,
 219                                               $self->fragment_sampler_views);
 220    }
 221
 222    void set_vertex_sampler_view(unsigned index,
 223                                 struct pipe_sampler_view *view)
 224    {
 225       pipe_sampler_view_reference(&$self->vertex_sampler_views[index], view);
 226
 227       $self->pipe->set_vertex_sampler_views($self->pipe,
 228                                             PIPE_MAX_VERTEX_SAMPLERS,
 229                                             $self->vertex_sampler_views);
 230    }
 231
 232    void set_fragment_sampler_texture(unsigned index,
 233                                      struct pipe_resource *texture) {
 234       struct pipe_sampler_view templ;
 235
 236       if(!texture)
 237          texture = $self->default_texture;
 238       pipe_sampler_view_reference(&$self->fragment_sampler_views[index], NULL);
 239       u_sampler_view_default_template(&templ,
 240                                       texture,
 241                                       texture->format);
 242       $self->fragment_sampler_views[index] = $self->pipe->create_sampler_view($self->pipe,
 243                                                                               texture,
 244                                                                               &templ);
 245       $self->pipe->set_fragment_sampler_views($self->pipe,
 246                                               PIPE_MAX_SAMPLERS,
 247                                               $self->fragment_sampler_views);
 248    }
 249
 250    void set_vertex_sampler_texture(unsigned index,
 251                                    struct pipe_resource *texture) {
 252       struct pipe_sampler_view templ;
 253
 254       if(!texture)
 255          texture = $self->default_texture;
 256       pipe_sampler_view_reference(&$self->vertex_sampler_views[index], NULL);
 257       u_sampler_view_default_template(&templ,
 258                                       texture,
 259                                       texture->format);
 260       $self->vertex_sampler_views[index] = $self->pipe->create_sampler_view($self->pipe,
 261                                                                             texture,
 262                                                                             &templ);
 263
 264       $self->pipe->set_vertex_sampler_views($self->pipe,
 265                                             PIPE_MAX_VERTEX_SAMPLERS,
 266                                             $self->vertex_sampler_views);
 267    }
 268
 269    void set_vertex_buffer(unsigned index,
 270                           unsigned stride,
 271                           unsigned max_index,
 272                           unsigned buffer_offset,
 273                           struct pipe_resource *buffer)
 274    {
 275       unsigned i;
 276       struct pipe_vertex_buffer state;
 277
 278       memset(&state, 0, sizeof(state));
 279       state.stride = stride;
 280       state.max_index = max_index;
 281       state.buffer_offset = buffer_offset;
 282       state.buffer = buffer;
 283
 284       memcpy(&$self->vertex_buffers[index], &state, sizeof(state));
 285
 286       for(i = 0; i < PIPE_MAX_ATTRIBS; ++i)
 287          if(self->vertex_buffers[i].buffer)
 288             $self->num_vertex_buffers = i + 1;
 289
 290       $self->pipe->set_vertex_buffers($self->pipe,
 291                                       $self->num_vertex_buffers,
 292                                       $self->vertex_buffers);
 293    }
 294
 295    void set_index_buffer(unsigned index_size,
 296                          unsigned offset,
 297                          struct pipe_resource *buffer)
 298    {
 299       struct pipe_index_buffer ib;
 300
 301       memset(&ib, 0, sizeof(ib));
 302       ib.index_size = index_size;
 303       ib.offset = offset;
 304       ib.buffer = buffer;
 305
 306       $self->pipe->set_index_buffer($self->pipe, &ib);
 307    }
 308
 309    void set_vertex_element(unsigned index,
 310                            const struct pipe_vertex_element *element)
 311    {
 312       memcpy(&$self->vertex_elements[index], element, sizeof(*element));
 313    }
 314
 315    void set_vertex_elements(unsigned num)
 316    {
 317       $self->num_vertex_elements = num;
 318       cso_set_vertex_elements($self->cso,
 319                               $self->num_vertex_elements,
 320                               $self->vertex_elements);
 321    }
 322
 323    /*
 324     * Draw functions
 325     */
 326
 327    void draw_arrays(unsigned mode, unsigned start, unsigned count) {
 328       util_draw_arrays($self->pipe, mode, start, count);
 329    }
 330
 331    void draw_vbo(const struct pipe_draw_info *info)
 332    {
 333       $self->pipe->draw_vbo($self->pipe, info);
 334    }
 335
 336    void draw_vertices(unsigned prim,
 337                       unsigned num_verts,
 338                       unsigned num_attribs,
 339                       const float *vertices)
 340    {
 341       struct pipe_context *pipe = $self->pipe;
 342       struct pipe_screen *screen = pipe->screen;
 343       struct pipe_resource *vbuf;
 344       struct pipe_transfer *transfer;
 345       struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 346       struct pipe_vertex_buffer vbuffer;
 347       float *map;
 348       unsigned size;
 349       unsigned i;
 350
 351       size = num_verts * num_attribs * 4 * sizeof(float);
 352
 353       vbuf = pipe_buffer_create(screen,
 354                                 PIPE_BIND_VERTEX_BUFFER,
 355                                 size);
 356       if(!vbuf)
 357          goto error1;
 358
 359       map = pipe_buffer_map(pipe, vbuf, PIPE_TRANSFER_WRITE, &transfer);
 360       if (!map)
 361          goto error2;
 362       memcpy(map, vertices, size);
 363       pipe_buffer_unmap(pipe, transfer);
 364
 365       cso_save_vertex_elements($self->cso);
 366
 367       /* tell pipe about the vertex attributes */
 368       for (i = 0; i < num_attribs; i++) {
 369          velements[i].src_offset = i * 4 * sizeof(float);
 370          velements[i].instance_divisor = 0;
 371          velements[i].vertex_buffer_index = 0;
 372          velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 373       }
 374       cso_set_vertex_elements($self->cso, num_attribs, velements);
 375
 376       /* tell pipe about the vertex buffer */
 377       memset(&vbuffer, 0, sizeof(vbuffer));
 378       vbuffer.buffer = vbuf;
 379       vbuffer.stride = num_attribs * 4 * sizeof(float);  /* vertex size */
 380       vbuffer.buffer_offset = 0;
 381       vbuffer.max_index = num_verts - 1;
 382       pipe->set_vertex_buffers(pipe, 1, &vbuffer);
 383
 384       /* draw */
 385       util_draw_arrays(pipe, prim, 0, num_verts);
 386
 387       cso_restore_vertex_elements($self->cso);
 388
 389 error2:
 390       pipe_resource_reference(&vbuf, NULL);
 391 error1:
 392       ;
 393    }
 394
 395    void
 396    clear(unsigned buffers, const float *rgba, double depth = 0.0f,
 397          unsigned stencil = 0)
 398    {
 399       $self->pipe->clear($self->pipe, buffers, rgba, depth, stencil);
 400    }
 401
 402    void
 403    flush(unsigned flags = 0) {
 404       struct pipe_fence_handle *fence = NULL;
 405       $self->pipe->flush($self->pipe, flags | PIPE_FLUSH_RENDER_CACHE, &fence);
 406       if(fence) {
 407          /* TODO: allow asynchronous operation */
 408          $self->pipe->screen->fence_finish( $self->pipe->screen, fence, 0 );
 409          $self->pipe->screen->fence_reference( $self->pipe->screen, &fence, NULL );
 410       }
 411    }
 412
 413    /*
 414     * Surface functions
 415     */
 416
 417    void resource_copy_region(struct pipe_resource *dst,
 418                              unsigned dst_level,
 419                              unsigned dstx, unsigned dsty, unsigned dstz,
 420                              struct pipe_resource *src,
 421                              unsigned src_level,
 422                              const struct pipe_box *src_box)
 423    {
 424       $self->pipe->resource_copy_region($self->pipe,
 425                                         dst, dst_level, dstx, dsty, dstz,
 426                                         src, src_level, src_box);
 427    }
 428
 429
 430    void clear_render_target(struct st_surface *dst,
 431                             float *rgba,
 432                             unsigned x, unsigned y,
 433                             unsigned width, unsigned height)
 434    {
 435       struct pipe_surface *_dst = NULL;
 436
 437      _dst = st_pipe_surface($self->pipe, dst, PIPE_BIND_RENDER_TARGET);
 438       if(!_dst)
 439          SWIG_exception(SWIG_ValueError, "couldn't acquire destination surface for writing");
 440
 441       $self->pipe->clear_render_target($self->pipe, _dst, rgba, x, y, width, height);
 442
 443    fail:
 444       pipe_surface_reference(&_dst, NULL);
 445    }
 446
 447    void clear_depth_stencil(struct st_surface *dst,
 448                             unsigned clear_flags,
 449                             double depth,
 450                             unsigned stencil,
 451                             unsigned x, unsigned y,
 452                             unsigned width, unsigned height)
 453    {
 454       struct pipe_surface *_dst = NULL;
 455
 456      _dst = st_pipe_surface($self->pipe, dst, PIPE_BIND_DEPTH_STENCIL);
 457       if(!_dst)
 458          SWIG_exception(SWIG_ValueError, "couldn't acquire destination surface for writing");
 459
 460       $self->pipe->clear_depth_stencil($self->pipe, _dst, clear_flags, depth, stencil,
 461                                        x, y, width, height);
 462
 463    fail:
 464       pipe_surface_reference(&_dst, NULL);
 465    }
 466
 467    %cstring_output_allocate_size(char **STRING, int *LENGTH, free(*$1));
 468    void
 469    surface_read_raw(struct st_surface *surface,
 470                     unsigned x, unsigned y, unsigned w, unsigned h,
 471                     char **STRING, int *LENGTH)
 472    {
 473       struct pipe_resource *texture = surface->texture;
 474       struct pipe_context *pipe = $self->pipe;
 475       struct pipe_transfer *transfer;
 476       unsigned stride;
 477
 478       stride = util_format_get_stride(texture->format, w);
 479       *LENGTH = util_format_get_nblocksy(texture->format, h) * stride;
 480       *STRING = (char *) malloc(*LENGTH);
 481       if(!*STRING)
 482          return;
 483
 484       transfer = pipe_get_transfer(pipe,
 485                                    surface->texture,
 486                                    surface->level,
 487                                    surface->layer,
 488                                    PIPE_TRANSFER_READ,
 489                                    x, y, w, h);
 490       if(transfer) {
 491          pipe_get_tile_raw(pipe, transfer, 0, 0, w, h, *STRING, stride);
 492          pipe->transfer_destroy(pipe, transfer);
 493       }
 494    }
 495
 496    %cstring_input_binary(const char *STRING, unsigned LENGTH);
 497    void
 498    surface_write_raw(struct st_surface *surface,
 499                      unsigned x, unsigned y, unsigned w, unsigned h,
 500                      const char *STRING, unsigned LENGTH, unsigned stride = 0)
 501    {
 502       struct pipe_resource *texture = surface->texture;
 503       struct pipe_context *pipe = $self->pipe;
 504       struct pipe_transfer *transfer;
 505
 506       if(stride == 0)
 507          stride = util_format_get_stride(texture->format, w);
 508
 509       if(LENGTH < util_format_get_nblocksy(texture->format, h) * stride)
 510          SWIG_exception(SWIG_ValueError, "offset must be smaller than buffer size");
 511
 512       transfer = pipe_get_transfer(pipe,
 513                                    surface->texture,
 514                                    surface->level,
 515                                    surface->layer,
 516                                    PIPE_TRANSFER_WRITE,
 517                                    x, y, w, h);
 518       if(!transfer)
 519          SWIG_exception(SWIG_MemoryError, "couldn't initiate transfer");
 520
 521       pipe_put_tile_raw(pipe, transfer, 0, 0, w, h, STRING, stride);
 522       pipe->transfer_destroy(pipe, transfer);
 523
 524    fail:
 525       return;
 526    }
 527
 528    void
 529    surface_read_rgba(struct st_surface *surface,
 530                      unsigned x, unsigned y, unsigned w, unsigned h,
 531                      float *rgba)
 532    {
 533       struct pipe_context *pipe = $self->pipe;
 534       struct pipe_transfer *transfer;
 535       transfer = pipe_get_transfer(pipe,
 536                                    surface->texture,
 537                                    surface->level,
 538                                    surface->layer,
 539                                    PIPE_TRANSFER_READ,
 540                                    x, y, w, h);
 541       if(transfer) {
 542          pipe_get_tile_rgba(pipe, transfer, 0, 0, w, h, rgba);
 543          pipe->transfer_destroy(pipe, transfer);
 544       }
 545    }
 546
 547    void
 548    surface_write_rgba(struct st_surface *surface,
 549                       unsigned x, unsigned y, unsigned w, unsigned h,
 550                       const float *rgba)
 551    {
 552       struct pipe_context *pipe = $self->pipe;
 553       struct pipe_transfer *transfer;
 554       transfer = pipe_get_transfer(pipe,
 555                                    surface->texture,
 556                                    surface->level,
 557                                    surface->layer,
 558                                    PIPE_TRANSFER_WRITE,
 559                                    x, y, w, h);
 560       if(transfer) {
 561          pipe_put_tile_rgba(pipe, transfer, 0, 0, w, h, rgba);
 562          pipe->transfer_destroy(pipe, transfer);
 563       }
 564    }
 565
 566    %cstring_output_allocate_size(char **STRING, int *LENGTH, free(*$1));
 567    void
 568    surface_read_rgba8(struct st_surface *surface,
 569                       unsigned x, unsigned y, unsigned w, unsigned h,
 570                       char **STRING, int *LENGTH)
 571    {
 572       struct pipe_context *pipe = $self->pipe;
 573       struct pipe_transfer *transfer;
 574       float *rgba;
 575       unsigned char *rgba8;
 576       unsigned i, j, k;
 577
 578       *LENGTH = 0;
 579       *STRING = NULL;
 580
 581       if (!surface)
 582          return;
 583
 584       *LENGTH = h*w*4;
 585       *STRING = (char *) malloc(*LENGTH);
 586       if(!*STRING)
 587          return;
 588
 589       rgba = malloc(h*w*4*sizeof(float));
 590       if(!rgba)
 591          return;
 592
 593       rgba8 = (unsigned char *) *STRING;
 594
 595       transfer = pipe_get_transfer(pipe,
 596                                    surface->texture,
 597                                    surface->level,
 598                                    surface->layer,
 599                                    PIPE_TRANSFER_READ,
 600                                    x, y, w, h);
 601       if(transfer) {
 602          pipe_get_tile_rgba(pipe, transfer, 0, 0, w, h, rgba);
 603          for(j = 0; j < h; ++j) {
 604             for(i = 0; i < w; ++i)
 605                for(k = 0; k <4; ++k)
 606                   rgba8[j*w*4 + i*4 + k] = float_to_ubyte(rgba[j*w*4 + i*4 + k]);
 607          }
 608          pipe->transfer_destroy(pipe, transfer);
 609       }
 610
 611       free(rgba);
 612    }
 613
 614    void
 615    surface_read_z(struct st_surface *surface,
 616                   unsigned x, unsigned y, unsigned w, unsigned h,
 617                   unsigned *z)
 618    {
 619       struct pipe_context *pipe = $self->pipe;
 620       struct pipe_transfer *transfer;
 621       transfer = pipe_get_transfer(pipe,
 622                                    surface->texture,
 623                                    surface->level,
 624                                    surface->layer,
 625                                    PIPE_TRANSFER_READ,
 626                                    x, y, w, h);
 627       if(transfer) {
 628          pipe_get_tile_z(pipe, transfer, 0, 0, w, h, z);
 629          pipe->transfer_destroy(pipe, transfer);
 630       }
 631    }
 632
 633    void
 634    surface_write_z(struct st_surface *surface,
 635                    unsigned x, unsigned y, unsigned w, unsigned h,
 636                    const unsigned *z)
 637    {
 638       struct pipe_context *pipe = $self->pipe;
 639       struct pipe_transfer *transfer;
 640       transfer = pipe_get_transfer(pipe,
 641                                    surface->texture,
 642                                    surface->level,
 643                                    surface->layer,
 644                                    PIPE_TRANSFER_WRITE,
 645                                    x, y, w, h);
 646       if(transfer) {
 647          pipe_put_tile_z(pipe, transfer, 0, 0, w, h, z);
 648          pipe->transfer_destroy(pipe, transfer);
 649       }
 650    }
 651
 652    void
 653    surface_sample_rgba(struct st_surface *surface,
 654                        float *rgba,
 655                        int norm = 0)
 656    {
 657       st_sample_surface($self->pipe, surface, rgba, norm != 0);
 658    }
 659
 660    unsigned
 661    surface_compare_rgba(struct st_surface *surface,
 662                         unsigned x, unsigned y, unsigned w, unsigned h,
 663                         const float *rgba, float tol = 0.0)
 664    {
 665       struct pipe_context *pipe = $self->pipe;
 666       struct pipe_transfer *transfer;
 667       float *rgba2;
 668       const float *p1;
 669       const float *p2;
 670       unsigned i, j, n;
 671
 672       rgba2 = MALLOC(h*w*4*sizeof(float));
 673       if(!rgba2)
 674          return ~0;
 675
 676       transfer = pipe_get_transfer(pipe,
 677                                    surface->texture,
 678                                    surface->level,
 679                                    surface->layer,
 680                                    PIPE_TRANSFER_READ,
 681                                    x, y, w, h);
 682       if(!transfer) {
 683          FREE(rgba2);
 684          return ~0;
 685       }
 686
 687       pipe_get_tile_rgba(pipe, transfer, 0, 0, w, h, rgba2);
 688       pipe->transfer_destroy(pipe, transfer);
 689
 690       p1 = rgba;
 691       p2 = rgba2;
 692       n = 0;
 693       for(i = h*w; i; --i) {
 694          unsigned differs = 0;
 695          for(j = 4; j; --j) {
 696             float delta = *p2++ - *p1++;
 697             if (delta < -tol || delta > tol)
 698                 differs = 1;
 699          }
 700          n += differs;
 701       }
 702
 703       FREE(rgba2);
 704
 705       return n;
 706    }
 707
 708    %cstring_input_binary(const char *STRING, unsigned LENGTH);
 709    void
 710    transfer_inline_write(struct pipe_resource *resource,
 711                          unsigned level,
 712                          unsigned usage,
 713                          const struct pipe_box *box,
 714                          const char *STRING, unsigned LENGTH,
 715                          unsigned stride,
 716                          unsigned layer_stride)
 717    {
 718       struct pipe_context *pipe = $self->pipe;
 719
 720       pipe->transfer_inline_write(pipe, resource, level, usage, box, STRING, stride, layer_stride);
 721    }
 722
 723    %cstring_output_allocate_size(char **STRING, int *LENGTH, free(*$1));
 724    void buffer_read(struct pipe_resource *buffer,
 725                     char **STRING, int *LENGTH)
 726    {
 727       struct pipe_context *pipe = $self->pipe;
 728
 729       assert(buffer->target == PIPE_BUFFER);
 730
 731       *LENGTH = buffer->width0;
 732       *STRING = (char *) malloc(buffer->width0);
 733       if(!*STRING)
 734          return;
 735
 736       pipe_buffer_read(pipe, buffer, 0, buffer->width0, *STRING);
 737    }
 738
 739    void buffer_write(struct pipe_resource *buffer,
 740                      const char *STRING, unsigned LENGTH, unsigned offset = 0)
 741    {
 742       struct pipe_context *pipe = $self->pipe;
 743
 744       assert(buffer->target == PIPE_BUFFER);
 745
 746       if(offset > buffer->width0)
 747          SWIG_exception(SWIG_ValueError, "offset must be smaller than buffer size");
 748
 749       if(offset + LENGTH > buffer->width0)
 750          SWIG_exception(SWIG_ValueError, "data length must fit inside the buffer");
 751
 752       pipe_buffer_write(pipe, buffer, offset, LENGTH, STRING);
 753
 754 fail:
 755       return;
 756    }
 757
 758 };