src/gallium/include/state_tracker/st_api.h

   1 /**********************************************************
   2  * Copyright 2010 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
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   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
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  25
  26
  27 #ifndef _ST_API_H_
  28 #define _ST_API_H_
  29
  30 #include "pipe/p_compiler.h"
  31 #include "pipe/p_format.h"
  32
  33 /**
  34  * \file API for communication between state trackers and state tracker
  35  * managers.
  36  *
  37  * While both are state tackers, we use the term state tracker for rendering
  38  * APIs such as OpenGL or OpenVG, and state tracker manager for window system
  39  * APIs such as EGL or GLX in this file.
  40  *
  41  * This file defines an API to be implemented by both state trackers and state
  42  * tracker managers.
  43  */
  44
  45 /**
  46  * The supported rendering API of a state tracker.
  47  */
  48 enum st_api_type {
  49    ST_API_OPENGL,
  50    ST_API_OPENVG,
  51
  52    ST_API_COUNT
  53 };
  54
  55 /**
  56  * The profile of a context.
  57  */
  58 enum st_profile_type
  59 {
  60    ST_PROFILE_DEFAULT,                  /**< OpenGL compatibility profile */
  61    ST_PROFILE_OPENGL_CORE,              /**< OpenGL 3.2+ core profile */
  62    ST_PROFILE_OPENGL_ES1,               /**< OpenGL ES 1.x */
  63    ST_PROFILE_OPENGL_ES2                /**< OpenGL ES 2.0 */
  64 };
  65
  66 /* for profile_mask in st_api */
  67 #define ST_PROFILE_DEFAULT_MASK      (1 << ST_PROFILE_DEFAULT)
  68 #define ST_PROFILE_OPENGL_CORE_MASK  (1 << ST_PROFILE_OPENGL_CORE)
  69 #define ST_PROFILE_OPENGL_ES1_MASK   (1 << ST_PROFILE_OPENGL_ES1)
  70 #define ST_PROFILE_OPENGL_ES2_MASK   (1 << ST_PROFILE_OPENGL_ES2)
  71
  72 /**
  73  * Optional API/state tracker features.
  74  */
  75 enum st_api_feature
  76 {
  77    ST_API_FEATURE_MS_VISUALS  /**< support for multisample visuals */
  78 };
  79
  80 /* for feature_mask in st_api */
  81 #define ST_API_FEATURE_MS_VISUALS_MASK (1 << ST_API_FEATURE_MS_VISUALS)
  82
  83 /**
  84  * New context flags for GL 3.0 and beyond.
  85  *
  86  * Profile information (core vs. compatibilty for OpenGL 3.2+) is communicated
  87  * through the \c st_profile_type, not through flags.
  88  */
  89 #define ST_CONTEXT_FLAG_DEBUG               (1 << 0)
  90 #define ST_CONTEXT_FLAG_FORWARD_COMPATIBLE  (1 << 1)
  91 #define ST_CONTEXT_FLAG_ROBUST_ACCESS       (1 << 2)
  92 #define ST_CONTEXT_FLAG_RESET_NOTIFICATION_ENABLED (1 << 3)
  93 #define ST_CONTEXT_FLAG_NO_ERROR            (1 << 4)
  94
  95 /**
  96  * Reasons that context creation might fail.
  97  */
  98 enum st_context_error {
  99    ST_CONTEXT_SUCCESS = 0,
 100    ST_CONTEXT_ERROR_NO_MEMORY,
 101    ST_CONTEXT_ERROR_BAD_API,
 102    ST_CONTEXT_ERROR_BAD_VERSION,
 103    ST_CONTEXT_ERROR_BAD_FLAG,
 104    ST_CONTEXT_ERROR_UNKNOWN_ATTRIBUTE,
 105    ST_CONTEXT_ERROR_UNKNOWN_FLAG
 106 };
 107
 108 /**
 109  * Used in st_context_iface->teximage.
 110  */
 111 enum st_texture_type {
 112    ST_TEXTURE_1D,
 113    ST_TEXTURE_2D,
 114    ST_TEXTURE_3D,
 115    ST_TEXTURE_RECT
 116 };
 117
 118 /**
 119  * Available attachments of framebuffer.
 120  */
 121 enum st_attachment_type {
 122    ST_ATTACHMENT_FRONT_LEFT,
 123    ST_ATTACHMENT_BACK_LEFT,
 124    ST_ATTACHMENT_FRONT_RIGHT,
 125    ST_ATTACHMENT_BACK_RIGHT,
 126    ST_ATTACHMENT_DEPTH_STENCIL,
 127    ST_ATTACHMENT_ACCUM,
 128    ST_ATTACHMENT_SAMPLE,
 129
 130    ST_ATTACHMENT_COUNT,
 131    ST_ATTACHMENT_INVALID = -1
 132 };
 133
 134 /* for buffer_mask in st_visual */
 135 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
 136 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
 137 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
 138 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
 139 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
 140 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
 141 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
 142
 143 /**
 144  * Enumerations of state tracker context resources.
 145  */
 146 enum st_context_resource_type {
 147    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
 148    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
 149    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
 150    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 151    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 152    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 153    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 154    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 155    ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
 156    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
 157 };
 158
 159 /**
 160  * Flush flags.
 161  */
 162 #define ST_FLUSH_FRONT                    (1 << 0)
 163 #define ST_FLUSH_END_OF_FRAME             (1 << 1)
 164 #define ST_FLUSH_WAIT                     (1 << 2)
 165
 166 /**
 167  * Value to st_manager->get_param function.
 168  */
 169 enum st_manager_param {
 170    /**
 171     * The dri state tracker on old libGL's doesn't do the right thing
 172     * with regards to invalidating the framebuffers.
 173     *
 174     * For the mesa state tracker that means that it needs to invalidate
 175     * the framebuffer in glViewport itself.
 176     */
 177    ST_MANAGER_BROKEN_INVALIDATE
 178 };
 179
 180 struct pipe_context;
 181 struct pipe_resource;
 182 struct pipe_fence_handle;
 183 struct util_queue_monitoring;
 184
 185 /**
 186  * Used in st_context_iface->get_resource_for_egl_image.
 187  */
 188 struct st_context_resource
 189 {
 190    /* these fields are filled in by the caller */
 191    enum st_context_resource_type type;
 192    void *resource;
 193
 194    /* this is owned by the caller */
 195    struct pipe_resource *texture;
 196 };
 197
 198 /**
 199  * Used in st_manager_iface->get_egl_image.
 200  */
 201 struct st_egl_image
 202 {
 203    /* this is owned by the caller */
 204    struct pipe_resource *texture;
 205
 206    /* format only differs from texture->format for multi-planar (YUV): */
 207    enum pipe_format format;
 208
 209    unsigned level;
 210    unsigned layer;
 211 };
 212
 213 /**
 214  * Represent the visual of a framebuffer.
 215  */
 216 struct st_visual
 217 {
 218    /**
 219     * Available buffers.  Bitfield of ST_ATTACHMENT_*_MASK bits.
 220     */
 221    unsigned buffer_mask;
 222
 223    /**
 224     * Buffer formats.  The formats are always set even when the buffer is
 225     * not available.
 226     */
 227    enum pipe_format color_format;
 228    enum pipe_format depth_stencil_format;
 229    enum pipe_format accum_format;
 230    int samples;
 231
 232    /**
 233     * Desired render buffer.
 234     */
 235    enum st_attachment_type render_buffer;
 236 };
 237
 238
 239 /**
 240  * Configuration options from driconf
 241  */
 242 struct st_config_options
 243 {
 244    boolean disable_blend_func_extended;
 245    boolean disable_glsl_line_continuations;
 246    boolean disable_shader_bit_encoding;
 247    boolean force_glsl_extensions_warn;
 248    unsigned force_glsl_version;
 249    boolean allow_glsl_extension_directive_midshader;
 250    boolean allow_glsl_builtin_variable_redeclaration;
 251    boolean allow_higher_compat_version;
 252    boolean glsl_zero_init;
 253    boolean force_glsl_abs_sqrt;
 254    unsigned char config_options_sha1[20];
 255 };
 256
 257 /**
 258  * Represent the attributes of a context.
 259  */
 260 struct st_context_attribs
 261 {
 262    /**
 263     * The profile and minimal version to support.
 264     *
 265     * The valid profiles and versions are rendering API dependent.  The latest
 266     * version satisfying the request should be returned.
 267     */
 268    enum st_profile_type profile;
 269    int major, minor;
 270
 271    /** Mask of ST_CONTEXT_FLAG_x bits */
 272    unsigned flags;
 273
 274    /**
 275     * The visual of the framebuffers the context will be bound to.
 276     */
 277    struct st_visual visual;
 278
 279    /**
 280     * Configuration options.
 281     */
 282    struct st_config_options options;
 283 };
 284
 285 struct st_context_iface;
 286 struct st_manager;
 287
 288 /**
 289  * Represent a windowing system drawable.
 290  *
 291  * The framebuffer is implemented by the state tracker manager and
 292  * used by the state trackers.
 293  *
 294  * Instead of the winsys poking into the API context to figure
 295  * out what buffers that might be needed in the future by the API
 296  * context, it calls into the framebuffer to get the textures.
 297  *
 298  * This structure along with the notify_invalid_framebuffer
 299  * allows framebuffers to be shared between different threads
 300  * but at the same make the API context free from thread
 301  * synchronization primitves, with the exception of a small
 302  * atomic flag used for notification of framebuffer dirty status.
 303  *
 304  * The thread synchronization is put inside the framebuffer
 305  * and only called once the framebuffer has become dirty.
 306  */
 307 struct st_framebuffer_iface
 308 {
 309    /**
 310     * Atomic stamp which changes when framebuffers need to be updated.
 311     */
 312    int32_t stamp;
 313
 314    /**
 315     * Identifier that uniquely identifies the framebuffer interface object.
 316     */
 317    uint32_t ID;
 318
 319    /**
 320     * The state tracker manager that manages this object.
 321     */
 322    struct st_manager *state_manager;
 323
 324    /**
 325     * Available for the state tracker manager to use.
 326     */
 327    void *st_manager_private;
 328
 329    /**
 330     * The visual of a framebuffer.
 331     */
 332    const struct st_visual *visual;
 333
 334    /**
 335     * Flush the front buffer.
 336     *
 337     * On some window systems, changes to the front buffers are not immediately
 338     * visible.  They need to be flushed.
 339     *
 340     * @att is one of the front buffer attachments.
 341     */
 342    boolean (*flush_front)(struct st_context_iface *stctx,
 343                           struct st_framebuffer_iface *stfbi,
 344                           enum st_attachment_type statt);
 345
 346    /**
 347     * The state tracker asks for the textures it needs.
 348     *
 349     * It should try to only ask for attachments that it currently renders
 350     * to, thus allowing the winsys to delay the allocation of textures not
 351     * needed. For example front buffer attachments are not needed if you
 352     * only do back buffer rendering.
 353     *
 354     * The implementor of this function needs to also ensure
 355     * thread safty as this call might be done from multiple threads.
 356     *
 357     * The returned textures are owned by the caller.  They should be
 358     * unreferenced when no longer used.  If this function is called multiple
 359     * times with different sets of attachments, those buffers not included in
 360     * the last call might be destroyed.  This behavior might change in the
 361     * future.
 362     */
 363    boolean (*validate)(struct st_context_iface *stctx,
 364                        struct st_framebuffer_iface *stfbi,
 365                        const enum st_attachment_type *statts,
 366                        unsigned count,
 367                        struct pipe_resource **out);
 368    boolean (*flush_swapbuffers) (struct st_context_iface *stctx,
 369                                  struct st_framebuffer_iface *stfbi);
 370 };
 371
 372 /**
 373  * Represent a rendering context.
 374  *
 375  * This entity is created from st_api and used by the state tracker manager.
 376  */
 377 struct st_context_iface
 378 {
 379    /**
 380     * Available for the state tracker and the manager to use.
 381     */
 382    void *st_context_private;
 383    void *st_manager_private;
 384
 385    /**
 386     * The state tracker manager that manages this object.
 387     */
 388    struct st_manager *state_manager;
 389
 390    /**
 391     * The CSO context associated with this context in case we need to draw
 392     * something before swap buffers.
 393     */
 394    struct cso_context *cso_context;
 395
 396    /**
 397     * The gallium context.
 398     */
 399    struct pipe_context *pipe;
 400
 401    /**
 402     * Destroy the context.
 403     */
 404    void (*destroy)(struct st_context_iface *stctxi);
 405
 406    /**
 407     * Flush all drawing from context to the pipe also flushes the pipe.
 408     */
 409    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 410                  struct pipe_fence_handle **fence);
 411
 412    /**
 413     * Replace the texture image of a texture object at the specified level.
 414     *
 415     * This function is optional.
 416     */
 417    boolean (*teximage)(struct st_context_iface *stctxi,
 418                        enum st_texture_type target,
 419                        int level, enum pipe_format internal_format,
 420                        struct pipe_resource *tex, boolean mipmap);
 421
 422    /**
 423     * Used to implement glXCopyContext.
 424     */
 425    void (*copy)(struct st_context_iface *stctxi,
 426                 struct st_context_iface *stsrci, unsigned mask);
 427
 428    /**
 429     * Used to implement wglShareLists.
 430     */
 431    boolean (*share)(struct st_context_iface *stctxi,
 432                     struct st_context_iface *stsrci);
 433
 434    /**
 435     * Look up and return the info of a resource for EGLImage.
 436     *
 437     * This function is optional.
 438     */
 439    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 440                                          struct st_context_resource *stres);
 441
 442    /**
 443     * Start the thread if the API has a worker thread.
 444     * Called after the context has been created and fully initialized on both
 445     * sides (e.g. st/mesa and st/dri).
 446     */
 447    void (*start_thread)(struct st_context_iface *stctxi);
 448
 449    /**
 450     * If the API is multithreaded, wait for all queued commands to complete.
 451     * Called from the main thread.
 452     */
 453    void (*thread_finish)(struct st_context_iface *stctxi);
 454 };
 455
 456
 457 /**
 458  * Represent a state tracker manager.
 459  *
 460  * This interface is implemented by the state tracker manager.  It corresponds
 461  * to a "display" in the window system.
 462  */
 463 struct st_manager
 464 {
 465    struct pipe_screen *screen;
 466
 467    /**
 468     * Look up and return the info of an EGLImage.
 469     *
 470     * This is used to implement for example EGLImageTargetTexture2DOES.
 471     * The GLeglImageOES agrument of that call is passed directly to this
 472     * function call and the information needed to access this is returned
 473     * in the given struct out.
 474     *
 475     * @smapi: manager owning the caller context
 476     * @stctx: caller context
 477     * @egl_image: EGLImage that caller recived
 478     * @out: return struct filled out with access information.
 479     *
 480     * This function is optional.
 481     */
 482    boolean (*get_egl_image)(struct st_manager *smapi,
 483                             void *egl_image,
 484                             struct st_egl_image *out);
 485
 486    /**
 487     * Query an manager param.
 488     */
 489    int (*get_param)(struct st_manager *smapi,
 490                     enum st_manager_param param);
 491
 492    /**
 493     * Call the loader function setBackgroundContext. Called from the worker
 494     * thread.
 495     */
 496    void (*set_background_context)(struct st_context_iface *stctxi,
 497                                   struct util_queue_monitoring *queue_info);
 498
 499    /**
 500     * Destroy any private data used by the state tracker manager.
 501     */
 502    void (*destroy)(struct st_manager *smapi);
 503
 504    /**
 505     * Available for the state tracker manager to use.
 506     */
 507    void *st_manager_private;
 508 };
 509
 510 /**
 511  * Represent a rendering API such as OpenGL or OpenVG.
 512  *
 513  * Implemented by the state tracker and used by the state tracker manager.
 514  */
 515 struct st_api
 516 {
 517    /**
 518     * The name of the rendering API.  This is informative.
 519     */
 520    const char *name;
 521
 522    /**
 523     * The supported rendering API.
 524     */
 525    enum st_api_type api;
 526
 527    /**
 528     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 529     */
 530    unsigned profile_mask;
 531
 532    /**
 533     * The supported optional features.  Tested with ST_FEATURE_*_MASK.
 534     */
 535    unsigned feature_mask;
 536
 537    /**
 538     * Destroy the API.
 539     */
 540    void (*destroy)(struct st_api *stapi);
 541
 542    /**
 543     * Query supported OpenGL versions. (if applicable)
 544     * The format is (major*10+minor).
 545     */
 546    void (*query_versions)(struct st_api *stapi, struct st_manager *sm,
 547                           struct st_config_options *options,
 548                           int *gl_core_version,
 549                           int *gl_compat_version,
 550                           int *gl_es1_version,
 551                           int *gl_es2_version);
 552
 553    /**
 554     * Create a rendering context.
 555     */
 556    struct st_context_iface *(*create_context)(struct st_api *stapi,
 557                                               struct st_manager *smapi,
 558                                               const struct st_context_attribs *attribs,
 559                                               enum st_context_error *error,
 560                                               struct st_context_iface *stsharei);
 561
 562    /**
 563     * Bind the context to the calling thread with draw and read as drawables.
 564     *
 565     * The framebuffers might be NULL, or might have different visuals than the
 566     * context does.
 567     */
 568    boolean (*make_current)(struct st_api *stapi,
 569                            struct st_context_iface *stctxi,
 570                            struct st_framebuffer_iface *stdrawi,
 571                            struct st_framebuffer_iface *streadi);
 572
 573    /**
 574     * Get the currently bound context in the calling thread.
 575     */
 576    struct st_context_iface *(*get_current)(struct st_api *stapi);
 577
 578    /**
 579     * Notify the st manager the framebuffer interface object
 580     * is no longer valid.
 581     */
 582    void (*destroy_drawable)(struct st_api *stapi,
 583                             struct st_framebuffer_iface *stfbi);
 584 };
 585
 586 /**
 587  * Return true if the visual has the specified buffers.
 588  */
 589 static inline boolean
 590 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 591 {
 592    return ((visual->buffer_mask & mask) == mask);
 593 }
 594
 595 #endif /* _ST_API_H_ */