src/gallium/include/pipe/p_context.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 #ifndef PIPE_CONTEXT_H
  29 #define PIPE_CONTEXT_H
  30
  31 #include "p_compiler.h"
  32 #include "p_format.h"
  33 #include "p_video_enums.h"
  34 #include "p_defines.h"
  35 #include <stdio.h>
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41
  42 struct pipe_blend_color;
  43 struct pipe_blend_state;
  44 struct pipe_blit_info;
  45 struct pipe_box;
  46 struct pipe_clip_state;
  47 struct pipe_constant_buffer;
  48 struct pipe_debug_callback;
  49 struct pipe_depth_stencil_alpha_state;
  50 struct pipe_draw_info;
  51 struct pipe_fence_handle;
  52 struct pipe_framebuffer_state;
  53 struct pipe_image_view;
  54 struct pipe_index_buffer;
  55 struct pipe_query;
  56 struct pipe_poly_stipple;
  57 struct pipe_rasterizer_state;
  58 struct pipe_resolve_info;
  59 struct pipe_resource;
  60 struct pipe_sampler_state;
  61 struct pipe_sampler_view;
  62 struct pipe_scissor_state;
  63 struct pipe_shader_buffer;
  64 struct pipe_shader_state;
  65 struct pipe_stencil_ref;
  66 struct pipe_stream_output_target;
  67 struct pipe_surface;
  68 struct pipe_transfer;
  69 struct pipe_vertex_buffer;
  70 struct pipe_vertex_element;
  71 struct pipe_video_buffer;
  72 struct pipe_video_codec;
  73 struct pipe_viewport_state;
  74 struct pipe_compute_state;
  75 union pipe_color_union;
  76 union pipe_query_result;
  77
  78 /**
  79  * Gallium rendering context.  Basically:
  80  *  - state setting functions
  81  *  - VBO drawing functions
  82  *  - surface functions
  83  */
  84 struct pipe_context {
  85    struct pipe_screen *screen;
  86
  87    void *priv;  /**< context private data (for DRI for example) */
  88    void *draw;  /**< private, for draw module (temporary?) */
  89
  90    void (*destroy)( struct pipe_context * );
  91
  92    /**
  93     * VBO drawing
  94     */
  95    /*@{*/
  96    void (*draw_vbo)( struct pipe_context *pipe,
  97                      const struct pipe_draw_info *info );
  98    /*@}*/
  99
 100    /**
 101     * Predicate subsequent rendering on occlusion query result
 102     * \param query  the query predicate, or NULL if no predicate
 103     * \param condition whether to skip on FALSE or TRUE query results
 104     * \param mode  one of PIPE_RENDER_COND_x
 105     */
 106    void (*render_condition)( struct pipe_context *pipe,
 107                              struct pipe_query *query,
 108                              boolean condition,
 109                              uint mode );
 110
 111    /**
 112     * Query objects
 113     */
 114    /*@{*/
 115    struct pipe_query *(*create_query)( struct pipe_context *pipe,
 116                                        unsigned query_type,
 117                                        unsigned index );
 118
 119    /**
 120     * Create a query object that queries all given query types simultaneously.
 121     *
 122     * This can only be used for those query types for which
 123     * get_driver_query_info indicates that it must be used. Only one batch
 124     * query object may be active at a time.
 125     *
 126     * There may be additional constraints on which query types can be used
 127     * together, in particular those that are implied by
 128     * get_driver_query_group_info.
 129     *
 130     * \param num_queries the number of query types
 131     * \param query_types array of \p num_queries query types
 132     * \return a query object, or NULL on error.
 133     */
 134    struct pipe_query *(*create_batch_query)( struct pipe_context *pipe,
 135                                              unsigned num_queries,
 136                                              unsigned *query_types );
 137
 138    void (*destroy_query)(struct pipe_context *pipe,
 139                          struct pipe_query *q);
 140
 141    boolean (*begin_query)(struct pipe_context *pipe, struct pipe_query *q);
 142    void (*end_query)(struct pipe_context *pipe, struct pipe_query *q);
 143
 144    /**
 145     * Get results of a query.
 146     * \param wait  if true, this query will block until the result is ready
 147     * \return TRUE if results are ready, FALSE otherwise
 148     */
 149    boolean (*get_query_result)(struct pipe_context *pipe,
 150                                struct pipe_query *q,
 151                                boolean wait,
 152                                union pipe_query_result *result);
 153    /*@}*/
 154
 155    /**
 156     * State functions (create/bind/destroy state objects)
 157     */
 158    /*@{*/
 159    void * (*create_blend_state)(struct pipe_context *,
 160                                 const struct pipe_blend_state *);
 161    void   (*bind_blend_state)(struct pipe_context *, void *);
 162    void   (*delete_blend_state)(struct pipe_context *, void  *);
 163
 164    void * (*create_sampler_state)(struct pipe_context *,
 165                                   const struct pipe_sampler_state *);
 166    void   (*bind_sampler_states)(struct pipe_context *,
 167                                  unsigned shader, unsigned start_slot,
 168                                  unsigned num_samplers, void **samplers);
 169    void   (*delete_sampler_state)(struct pipe_context *, void *);
 170
 171    void * (*create_rasterizer_state)(struct pipe_context *,
 172                                      const struct pipe_rasterizer_state *);
 173    void   (*bind_rasterizer_state)(struct pipe_context *, void *);
 174    void   (*delete_rasterizer_state)(struct pipe_context *, void *);
 175
 176    void * (*create_depth_stencil_alpha_state)(struct pipe_context *,
 177                                         const struct pipe_depth_stencil_alpha_state *);
 178    void   (*bind_depth_stencil_alpha_state)(struct pipe_context *, void *);
 179    void   (*delete_depth_stencil_alpha_state)(struct pipe_context *, void *);
 180
 181    void * (*create_fs_state)(struct pipe_context *,
 182                              const struct pipe_shader_state *);
 183    void   (*bind_fs_state)(struct pipe_context *, void *);
 184    void   (*delete_fs_state)(struct pipe_context *, void *);
 185
 186    void * (*create_vs_state)(struct pipe_context *,
 187                              const struct pipe_shader_state *);
 188    void   (*bind_vs_state)(struct pipe_context *, void *);
 189    void   (*delete_vs_state)(struct pipe_context *, void *);
 190
 191    void * (*create_gs_state)(struct pipe_context *,
 192                              const struct pipe_shader_state *);
 193    void   (*bind_gs_state)(struct pipe_context *, void *);
 194    void   (*delete_gs_state)(struct pipe_context *, void *);
 195
 196    void * (*create_tcs_state)(struct pipe_context *,
 197                               const struct pipe_shader_state *);
 198    void   (*bind_tcs_state)(struct pipe_context *, void *);
 199    void   (*delete_tcs_state)(struct pipe_context *, void *);
 200
 201    void * (*create_tes_state)(struct pipe_context *,
 202                               const struct pipe_shader_state *);
 203    void   (*bind_tes_state)(struct pipe_context *, void *);
 204    void   (*delete_tes_state)(struct pipe_context *, void *);
 205
 206    void * (*create_vertex_elements_state)(struct pipe_context *,
 207                                           unsigned num_elements,
 208                                           const struct pipe_vertex_element *);
 209    void   (*bind_vertex_elements_state)(struct pipe_context *, void *);
 210    void   (*delete_vertex_elements_state)(struct pipe_context *, void *);
 211
 212    /*@}*/
 213
 214    /**
 215     * Parameter-like state (or properties)
 216     */
 217    /*@{*/
 218    void (*set_blend_color)( struct pipe_context *,
 219                             const struct pipe_blend_color * );
 220
 221    void (*set_stencil_ref)( struct pipe_context *,
 222                             const struct pipe_stencil_ref * );
 223
 224    void (*set_sample_mask)( struct pipe_context *,
 225                             unsigned sample_mask );
 226
 227    void (*set_min_samples)( struct pipe_context *,
 228                             unsigned min_samples );
 229
 230    void (*set_clip_state)( struct pipe_context *,
 231                             const struct pipe_clip_state * );
 232
 233    void (*set_constant_buffer)( struct pipe_context *,
 234                                 uint shader, uint index,
 235                                 struct pipe_constant_buffer *buf );
 236
 237    void (*set_framebuffer_state)( struct pipe_context *,
 238                                   const struct pipe_framebuffer_state * );
 239
 240    void (*set_polygon_stipple)( struct pipe_context *,
 241                                 const struct pipe_poly_stipple * );
 242
 243    void (*set_scissor_states)( struct pipe_context *,
 244                                unsigned start_slot,
 245                                unsigned num_scissors,
 246                                const struct pipe_scissor_state * );
 247
 248    void (*set_viewport_states)( struct pipe_context *,
 249                                 unsigned start_slot,
 250                                 unsigned num_viewports,
 251                                 const struct pipe_viewport_state *);
 252
 253    void (*set_sampler_views)(struct pipe_context *, unsigned shader,
 254                              unsigned start_slot, unsigned num_views,
 255                              struct pipe_sampler_view **);
 256
 257    void (*set_tess_state)(struct pipe_context *,
 258                           const float default_outer_level[4],
 259                           const float default_inner_level[2]);
 260
 261    /**
 262     * Sets the debug callback. If the pointer is null, then no callback is
 263     * set, otherwise a copy of the data should be made.
 264     */
 265    void (*set_debug_callback)(struct pipe_context *,
 266                               const struct pipe_debug_callback *);
 267
 268    /**
 269     * Bind an array of shader buffers that will be used by a shader.
 270     * Any buffers that were previously bound to the specified range
 271     * will be unbound.
 272     *
 273     * \param shader     selects shader stage
 274     * \param start_slot first buffer slot to bind.
 275     * \param count      number of consecutive buffers to bind.
 276     * \param buffers    array of pointers to the buffers to bind, it
 277     *                   should contain at least \a count elements
 278     *                   unless it's NULL, in which case no buffers will
 279     *                   be bound.
 280     */
 281    void (*set_shader_buffers)(struct pipe_context *, unsigned shader,
 282                               unsigned start_slot, unsigned count,
 283                               struct pipe_shader_buffer *buffers);
 284
 285    /**
 286     * Bind an array of images that will be used by a shader.
 287     * Any images that were previously bound to the specified range
 288     * will be unbound.
 289     *
 290     * \param shader     selects shader stage
 291     * \param start_slot first image slot to bind.
 292     * \param count      number of consecutive images to bind.
 293     * \param buffers    array of pointers to the images to bind, it
 294     *                   should contain at least \a count elements
 295     *                   unless it's NULL, in which case no images will
 296     *                   be bound.
 297     */
 298    void (*set_shader_images)(struct pipe_context *, unsigned shader,
 299                              unsigned start_slot, unsigned count,
 300                              struct pipe_image_view **images);
 301
 302    void (*set_vertex_buffers)( struct pipe_context *,
 303                                unsigned start_slot,
 304                                unsigned num_buffers,
 305                                const struct pipe_vertex_buffer * );
 306
 307    void (*set_index_buffer)( struct pipe_context *pipe,
 308                              const struct pipe_index_buffer * );
 309
 310    /*@}*/
 311
 312    /**
 313     * Stream output functions.
 314     */
 315    /*@{*/
 316
 317    struct pipe_stream_output_target *(*create_stream_output_target)(
 318                         struct pipe_context *,
 319                         struct pipe_resource *,
 320                         unsigned buffer_offset,
 321                         unsigned buffer_size);
 322
 323    void (*stream_output_target_destroy)(struct pipe_context *,
 324                                         struct pipe_stream_output_target *);
 325
 326    void (*set_stream_output_targets)(struct pipe_context *,
 327                               unsigned num_targets,
 328                               struct pipe_stream_output_target **targets,
 329                               const unsigned *offsets);
 330
 331    /*@}*/
 332
 333
 334    /**
 335     * Resource functions for blit-like functionality
 336     *
 337     * If a driver supports multisampling, blit must implement color resolve.
 338     */
 339    /*@{*/
 340
 341    /**
 342     * Copy a block of pixels from one resource to another.
 343     * The resource must be of the same format.
 344     * Resources with nr_samples > 1 are not allowed.
 345     */
 346    void (*resource_copy_region)(struct pipe_context *pipe,
 347                                 struct pipe_resource *dst,
 348                                 unsigned dst_level,
 349                                 unsigned dstx, unsigned dsty, unsigned dstz,
 350                                 struct pipe_resource *src,
 351                                 unsigned src_level,
 352                                 const struct pipe_box *src_box);
 353
 354    /* Optimal hardware path for blitting pixels.
 355     * Scaling, format conversion, up- and downsampling (resolve) are allowed.
 356     */
 357    void (*blit)(struct pipe_context *pipe,
 358                 const struct pipe_blit_info *info);
 359
 360    /*@}*/
 361
 362    /**
 363     * Clear the specified set of currently bound buffers to specified values.
 364     * The entire buffers are cleared (no scissor, no colormask, etc).
 365     *
 366     * \param buffers  bitfield of PIPE_CLEAR_* values.
 367     * \param color  pointer to a union of fiu array for each of r, g, b, a.
 368     * \param depth  depth clear value in [0,1].
 369     * \param stencil  stencil clear value
 370     */
 371    void (*clear)(struct pipe_context *pipe,
 372                  unsigned buffers,
 373                  const union pipe_color_union *color,
 374                  double depth,
 375                  unsigned stencil);
 376
 377    /**
 378     * Clear a color rendertarget surface.
 379     * \param color  pointer to an union of fiu array for each of r, g, b, a.
 380     */
 381    void (*clear_render_target)(struct pipe_context *pipe,
 382                                struct pipe_surface *dst,
 383                                const union pipe_color_union *color,
 384                                unsigned dstx, unsigned dsty,
 385                                unsigned width, unsigned height);
 386
 387    /**
 388     * Clear a depth-stencil surface.
 389     * \param clear_flags  bitfield of PIPE_CLEAR_DEPTH/STENCIL values.
 390     * \param depth  depth clear value in [0,1].
 391     * \param stencil  stencil clear value
 392     */
 393    void (*clear_depth_stencil)(struct pipe_context *pipe,
 394                                struct pipe_surface *dst,
 395                                unsigned clear_flags,
 396                                double depth,
 397                                unsigned stencil,
 398                                unsigned dstx, unsigned dsty,
 399                                unsigned width, unsigned height);
 400
 401    /**
 402     * Clear the texture with the specified texel. Not guaranteed to be a
 403     * renderable format. Data provided in the resource's format.
 404     */
 405    void (*clear_texture)(struct pipe_context *pipe,
 406                          struct pipe_resource *res,
 407                          unsigned level,
 408                          const struct pipe_box *box,
 409                          const void *data);
 410
 411    /**
 412     * Clear a buffer. Runs a memset over the specified region with the element
 413     * value passed in through clear_value of size clear_value_size.
 414     */
 415    void (*clear_buffer)(struct pipe_context *pipe,
 416                         struct pipe_resource *res,
 417                         unsigned offset,
 418                         unsigned size,
 419                         const void *clear_value,
 420                         int clear_value_size);
 421
 422    /**
 423     * Flush draw commands
 424     *
 425     * NOTE: use screen->fence_reference() (or equivalent) to transfer
 426     * new fence ref to **fence, to ensure that previous fence is unref'd
 427     *
 428     * \param fence  if not NULL, an old fence to unref and transfer a
 429     *    new fence reference to
 430     * \param flags  bitfield of enum pipe_flush_flags values.
 431     */
 432    void (*flush)(struct pipe_context *pipe,
 433                  struct pipe_fence_handle **fence,
 434                  unsigned flags);
 435
 436    /**
 437     * Create a view on a texture to be used by a shader stage.
 438     */
 439    struct pipe_sampler_view * (*create_sampler_view)(struct pipe_context *ctx,
 440                                                      struct pipe_resource *texture,
 441                                                      const struct pipe_sampler_view *templat);
 442
 443    void (*sampler_view_destroy)(struct pipe_context *ctx,
 444                                 struct pipe_sampler_view *view);
 445
 446
 447    /**
 448     * Get a surface which is a "view" into a resource, used by
 449     * render target / depth stencil stages.
 450     */
 451    struct pipe_surface *(*create_surface)(struct pipe_context *ctx,
 452                                           struct pipe_resource *resource,
 453                                           const struct pipe_surface *templat);
 454
 455    void (*surface_destroy)(struct pipe_context *ctx,
 456                            struct pipe_surface *);
 457
 458    /**
 459     * Create an image view into a buffer or texture to be used with load,
 460     * store, and atomic instructions by a shader stage.
 461     */
 462    struct pipe_image_view * (*create_image_view)(struct pipe_context *ctx,
 463                                                  struct pipe_resource *texture,
 464                                                  const struct pipe_image_view *templat);
 465
 466    void (*image_view_destroy)(struct pipe_context *ctx,
 467                               struct pipe_image_view *view);
 468
 469    /**
 470     * Map a resource.
 471     *
 472     * Transfers are (by default) context-private and allow uploads to be
 473     * interleaved with rendering.
 474     *
 475     * out_transfer will contain the transfer object that must be passed
 476     * to all the other transfer functions. It also contains useful
 477     * information (like texture strides).
 478     */
 479    void *(*transfer_map)(struct pipe_context *,
 480                          struct pipe_resource *resource,
 481                          unsigned level,
 482                          unsigned usage,  /* a combination of PIPE_TRANSFER_x */
 483                          const struct pipe_box *,
 484                          struct pipe_transfer **out_transfer);
 485
 486    /* If transfer was created with WRITE|FLUSH_EXPLICIT, only the
 487     * regions specified with this call are guaranteed to be written to
 488     * the resource.
 489     */
 490    void (*transfer_flush_region)( struct pipe_context *,
 491                                   struct pipe_transfer *transfer,
 492                                   const struct pipe_box *);
 493
 494    void (*transfer_unmap)(struct pipe_context *,
 495                           struct pipe_transfer *transfer);
 496
 497    /* One-shot transfer operation with data supplied in a user
 498     * pointer.  XXX: strides??
 499     */
 500    void (*transfer_inline_write)( struct pipe_context *,
 501                                   struct pipe_resource *,
 502                                   unsigned level,
 503                                   unsigned usage, /* a combination of PIPE_TRANSFER_x */
 504                                   const struct pipe_box *,
 505                                   const void *data,
 506                                   unsigned stride,
 507                                   unsigned layer_stride);
 508
 509    /**
 510     * Flush any pending framebuffer writes and invalidate texture caches.
 511     */
 512    void (*texture_barrier)(struct pipe_context *);
 513
 514    /**
 515     * Flush caches according to flags.
 516     */
 517    void (*memory_barrier)(struct pipe_context *, unsigned flags);
 518
 519    /**
 520     * Creates a video codec for a specific video format/profile
 521     */
 522    struct pipe_video_codec *(*create_video_codec)( struct pipe_context *context,
 523                                                    const struct pipe_video_codec *templat );
 524
 525    /**
 526     * Creates a video buffer as decoding target
 527     */
 528    struct pipe_video_buffer *(*create_video_buffer)( struct pipe_context *context,
 529                                                      const struct pipe_video_buffer *templat );
 530
 531    /**
 532     * Compute kernel execution
 533     */
 534    /*@{*/
 535    /**
 536     * Define the compute program and parameters to be used by
 537     * pipe_context::launch_grid.
 538     */
 539    void *(*create_compute_state)(struct pipe_context *context,
 540                                  const struct pipe_compute_state *);
 541    void (*bind_compute_state)(struct pipe_context *, void *);
 542    void (*delete_compute_state)(struct pipe_context *, void *);
 543
 544    /**
 545     * Bind an array of shader resources that will be used by the
 546     * compute program.  Any resources that were previously bound to
 547     * the specified range will be unbound after this call.
 548     *
 549     * \param start      first resource to bind.
 550     * \param count      number of consecutive resources to bind.
 551     * \param resources  array of pointers to the resources to bind, it
 552     *                   should contain at least \a count elements
 553     *                   unless it's NULL, in which case no new
 554     *                   resources will be bound.
 555     */
 556    void (*set_compute_resources)(struct pipe_context *,
 557                                  unsigned start, unsigned count,
 558                                  struct pipe_surface **resources);
 559
 560    /**
 561     * Bind an array of buffers to be mapped into the address space of
 562     * the GLOBAL resource.  Any buffers that were previously bound
 563     * between [first, first + count - 1] are unbound after this call.
 564     *
 565     * \param first      first buffer to map.
 566     * \param count      number of consecutive buffers to map.
 567     * \param resources  array of pointers to the buffers to map, it
 568     *                   should contain at least \a count elements
 569     *                   unless it's NULL, in which case no new
 570     *                   resources will be bound.
 571     * \param handles    array of pointers to the memory locations that
 572     *                   will be updated with the address each buffer
 573     *                   will be mapped to.  The base memory address of
 574     *                   each of the buffers will be added to the value
 575     *                   pointed to by its corresponding handle to form
 576     *                   the final address argument.  It should contain
 577     *                   at least \a count elements, unless \a
 578     *                   resources is NULL in which case \a handles
 579     *                   should be NULL as well.
 580     *
 581     * Note that the driver isn't required to make any guarantees about
 582     * the contents of the \a handles array being valid anytime except
 583     * during the subsequent calls to pipe_context::launch_grid.  This
 584     * means that the only sensible location handles[i] may point to is
 585     * somewhere within the INPUT buffer itself.  This is so to
 586     * accommodate implementations that lack virtual memory but
 587     * nevertheless migrate buffers on the fly, leading to resource
 588     * base addresses that change on each kernel invocation or are
 589     * unknown to the pipe driver.
 590     */
 591    void (*set_global_binding)(struct pipe_context *context,
 592                               unsigned first, unsigned count,
 593                               struct pipe_resource **resources,
 594                               uint32_t **handles);
 595
 596    /**
 597     * Launch the compute kernel starting from instruction \a pc of the
 598     * currently bound compute program.
 599     *
 600     * \a grid_layout and \a block_layout are arrays of size \a
 601     * PIPE_COMPUTE_CAP_GRID_DIMENSION that determine the layout of the
 602     * grid (in block units) and working block (in thread units) to be
 603     * used, respectively.
 604     *
 605     * \a pc For drivers that use PIPE_SHADER_IR_LLVM as their prefered IR,
 606     * this value will be the index of the kernel in the opencl.kernels
 607     * metadata list.
 608     *
 609     * \a input will be used to initialize the INPUT resource, and it
 610     * should point to a buffer of at least
 611     * pipe_compute_state::req_input_mem bytes.
 612     */
 613    void (*launch_grid)(struct pipe_context *context,
 614                        const uint *block_layout, const uint *grid_layout,
 615                        uint32_t pc, const void *input);
 616    /*@}*/
 617
 618    /**
 619     * Get sample position for an individual sample point.
 620     *
 621     * \param sample_count - total number of samples
 622     * \param sample_index - sample to get the position values for
 623     * \param out_value - return value of 2 floats for x and y position for
 624     *                    requested sample.
 625     */
 626    void (*get_sample_position)(struct pipe_context *context,
 627                                unsigned sample_count,
 628                                unsigned sample_index,
 629                                float *out_value);
 630
 631    /**
 632     * Query a timestamp in nanoseconds.  This is completely equivalent to
 633     * pipe_screen::get_timestamp() but takes a context handle for drivers
 634     * that require a context.
 635     */
 636    uint64_t (*get_timestamp)(struct pipe_context *);
 637
 638    /**
 639     * Flush the resource cache, so that the resource can be used
 640     * by an external client. Possible usage:
 641     * - flushing a resource before presenting it on the screen
 642     * - flushing a resource if some other process or device wants to use it
 643     * This shouldn't be used to flush caches if the resource is only managed
 644     * by a single pipe_screen and is not shared with another process.
 645     * (i.e. you shouldn't use it to flush caches explicitly if you want to e.g.
 646     * use the resource for texturing)
 647     */
 648    void (*flush_resource)(struct pipe_context *ctx,
 649                           struct pipe_resource *resource);
 650
 651    /**
 652     * Invalidate the contents of the resource.
 653     *
 654     * This is used to implement EGL's semantic of undefined depth/stencil
 655     * contenst after a swapbuffers.  This allows a tiled renderer (for
 656     * example) to not store the depth buffer.
 657     */
 658    void (*invalidate_resource)(struct pipe_context *ctx,
 659                                struct pipe_resource *resource);
 660
 661    /**
 662     * Return information about unexpected device resets.
 663     */
 664    enum pipe_reset_status (*get_device_reset_status)(struct pipe_context *ctx);
 665
 666    /**
 667     * Dump driver-specific debug information into a stream. This is
 668     * used by debugging tools.
 669     *
 670     * \param ctx        pipe context
 671     * \param stream     where the output should be written to
 672     * \param flags      a mask of PIPE_DEBUG_* flags
 673     */
 674    void (*dump_debug_state)(struct pipe_context *ctx, FILE *stream,
 675                             unsigned flags);
 676 };
 677
 678
 679 #ifdef __cplusplus
 680 }
 681 #endif
 682
 683 #endif /* PIPE_CONTEXT_H */