src/gallium/include/state_tracker/st_api.h

   1 /**********************************************************
   2  * Copyright 2010 VMware, Inc.  All rights reserved.
   3  *
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   5  * obtaining a copy of this software and associated documentation
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  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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  25
  26
  27 #ifndef _ST_API_H_
  28 #define _ST_API_H_
  29
  30 #include "pipe/p_format.h"
  31
  32 /**
  33  * \file API for communication between state trackers and state tracker
  34  * managers.
  35  *
  36  * While both are state tackers, we use the term state tracker for rendering
  37  * APIs such as OpenGL or OpenVG, and state tracker manager for window system
  38  * APIs such as EGL or GLX in this file.
  39  *
  40  * This file defines an API to be implemented by both state trackers and state
  41  * tracker managers.
  42  */
  43
  44 /**
  45  * The supported rendering API of a state tracker.
  46  */
  47 enum st_api_type {
  48    ST_API_OPENGL,
  49    ST_API_OPENVG,
  50
  51    ST_API_COUNT
  52 };
  53
  54 /**
  55  * The profile of a context.
  56  */
  57 enum st_profile_type
  58 {
  59    ST_PROFILE_DEFAULT,                  /**< OpenGL compatibility profile */
  60    ST_PROFILE_OPENGL_CORE,              /**< OpenGL 3.2+ core profile */
  61    ST_PROFILE_OPENGL_ES1,               /**< OpenGL ES 1.x */
  62    ST_PROFILE_OPENGL_ES2                /**< OpenGL ES 2.0 */
  63 };
  64
  65 /* for profile_mask in st_api */
  66 #define ST_PROFILE_DEFAULT_MASK      (1 << ST_PROFILE_DEFAULT)
  67 #define ST_PROFILE_OPENGL_CORE_MASK  (1 << ST_PROFILE_OPENGL_CORE)
  68 #define ST_PROFILE_OPENGL_ES1_MASK   (1 << ST_PROFILE_OPENGL_ES1)
  69 #define ST_PROFILE_OPENGL_ES2_MASK   (1 << ST_PROFILE_OPENGL_ES2)
  70
  71 /**
  72  * Optional API/state tracker features.
  73  */
  74 enum st_api_feature
  75 {
  76    ST_API_FEATURE_MS_VISUALS  /**< support for multisample visuals */
  77 };
  78
  79 /* for feature_mask in st_api */
  80 #define ST_API_FEATURE_MS_VISUALS_MASK (1 << ST_API_FEATURE_MS_VISUALS)
  81
  82 /**
  83  * New context flags for GL 3.0 and beyond.
  84  *
  85  * Profile information (core vs. compatibilty for OpenGL 3.2+) is communicated
  86  * through the \c st_profile_type, not through flags.
  87  */
  88 #define ST_CONTEXT_FLAG_DEBUG               (1 << 0)
  89 #define ST_CONTEXT_FLAG_FORWARD_COMPATIBLE  (1 << 1)
  90 #define ST_CONTEXT_FLAG_ROBUST_ACCESS       (1 << 2)
  91 #define ST_CONTEXT_FLAG_RESET_NOTIFICATION_ENABLED (1 << 3)
  92 #define ST_CONTEXT_FLAG_NO_ERROR            (1 << 4)
  93 #define ST_CONTEXT_FLAG_RELEASE_NONE        (1 << 5)
  94 #define ST_CONTEXT_FLAG_HIGH_PRIORITY       (1 << 6)
  95 #define ST_CONTEXT_FLAG_LOW_PRIORITY        (1 << 7)
  96
  97 /**
  98  * Reasons that context creation might fail.
  99  */
 100 enum st_context_error {
 101    ST_CONTEXT_SUCCESS = 0,
 102    ST_CONTEXT_ERROR_NO_MEMORY,
 103    ST_CONTEXT_ERROR_BAD_API,
 104    ST_CONTEXT_ERROR_BAD_VERSION,
 105    ST_CONTEXT_ERROR_BAD_FLAG,
 106    ST_CONTEXT_ERROR_UNKNOWN_ATTRIBUTE,
 107    ST_CONTEXT_ERROR_UNKNOWN_FLAG
 108 };
 109
 110 /**
 111  * Used in st_context_iface->teximage.
 112  */
 113 enum st_texture_type {
 114    ST_TEXTURE_1D,
 115    ST_TEXTURE_2D,
 116    ST_TEXTURE_3D,
 117    ST_TEXTURE_RECT
 118 };
 119
 120 /**
 121  * Available attachments of framebuffer.
 122  */
 123 enum st_attachment_type {
 124    ST_ATTACHMENT_FRONT_LEFT,
 125    ST_ATTACHMENT_BACK_LEFT,
 126    ST_ATTACHMENT_FRONT_RIGHT,
 127    ST_ATTACHMENT_BACK_RIGHT,
 128    ST_ATTACHMENT_DEPTH_STENCIL,
 129    ST_ATTACHMENT_ACCUM,
 130    ST_ATTACHMENT_SAMPLE,
 131
 132    ST_ATTACHMENT_COUNT,
 133    ST_ATTACHMENT_INVALID = -1
 134 };
 135
 136 /* for buffer_mask in st_visual */
 137 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
 138 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
 139 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
 140 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
 141 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
 142 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
 143 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
 144
 145 /**
 146  * Flush flags.
 147  */
 148 #define ST_FLUSH_FRONT                    (1 << 0)
 149 #define ST_FLUSH_END_OF_FRAME             (1 << 1)
 150 #define ST_FLUSH_WAIT                     (1 << 2)
 151 #define ST_FLUSH_FENCE_FD                 (1 << 3)
 152
 153 /**
 154  * Value to st_manager->get_param function.
 155  */
 156 enum st_manager_param {
 157    /**
 158     * The dri state tracker on old libGL's doesn't do the right thing
 159     * with regards to invalidating the framebuffers.
 160     *
 161     * For the mesa state tracker that means that it needs to invalidate
 162     * the framebuffer in glViewport itself.
 163     */
 164    ST_MANAGER_BROKEN_INVALIDATE
 165 };
 166
 167 struct pipe_context;
 168 struct pipe_resource;
 169 struct pipe_fence_handle;
 170 struct util_queue_monitoring;
 171
 172 /**
 173  * Used in st_manager_iface->get_egl_image.
 174  */
 175 struct st_egl_image
 176 {
 177    /* this is owned by the caller */
 178    struct pipe_resource *texture;
 179
 180    /* format only differs from texture->format for multi-planar (YUV): */
 181    enum pipe_format format;
 182
 183    unsigned level;
 184    unsigned layer;
 185 };
 186
 187 /**
 188  * Represent the visual of a framebuffer.
 189  */
 190 struct st_visual
 191 {
 192    bool no_config;
 193
 194    /**
 195     * Available buffers.  Bitfield of ST_ATTACHMENT_*_MASK bits.
 196     */
 197    unsigned buffer_mask;
 198
 199    /**
 200     * Buffer formats.  The formats are always set even when the buffer is
 201     * not available.
 202     */
 203    enum pipe_format color_format;
 204    enum pipe_format depth_stencil_format;
 205    enum pipe_format accum_format;
 206    unsigned samples;
 207
 208    /**
 209     * Desired render buffer.
 210     */
 211    enum st_attachment_type render_buffer;
 212 };
 213
 214
 215 /**
 216  * Configuration options from driconf
 217  */
 218 struct st_config_options
 219 {
 220    bool disable_blend_func_extended;
 221    bool disable_glsl_line_continuations;
 222    bool disable_arb_gpu_shader5;
 223    bool force_glsl_extensions_warn;
 224    unsigned force_glsl_version;
 225    bool allow_glsl_extension_directive_midshader;
 226    bool allow_glsl_builtin_const_expression;
 227    bool allow_glsl_relaxed_es;
 228    bool allow_glsl_builtin_variable_redeclaration;
 229    bool allow_higher_compat_version;
 230    bool glsl_zero_init;
 231    bool vs_position_always_invariant;
 232    bool force_glsl_abs_sqrt;
 233    bool allow_glsl_cross_stage_interpolation_mismatch;
 234    bool allow_glsl_layout_qualifier_on_function_parameters;
 235    char *force_gl_vendor;
 236    unsigned char config_options_sha1[20];
 237 };
 238
 239 /**
 240  * Represent the attributes of a context.
 241  */
 242 struct st_context_attribs
 243 {
 244    /**
 245     * The profile and minimal version to support.
 246     *
 247     * The valid profiles and versions are rendering API dependent.  The latest
 248     * version satisfying the request should be returned.
 249     */
 250    enum st_profile_type profile;
 251    int major, minor;
 252
 253    /** Mask of ST_CONTEXT_FLAG_x bits */
 254    unsigned flags;
 255
 256    /**
 257     * The visual of the framebuffers the context will be bound to.
 258     */
 259    struct st_visual visual;
 260
 261    /**
 262     * Configuration options.
 263     */
 264    struct st_config_options options;
 265 };
 266
 267 struct st_context_iface;
 268 struct st_manager;
 269
 270 /**
 271  * Represent a windowing system drawable.
 272  *
 273  * The framebuffer is implemented by the state tracker manager and
 274  * used by the state trackers.
 275  *
 276  * Instead of the winsys poking into the API context to figure
 277  * out what buffers that might be needed in the future by the API
 278  * context, it calls into the framebuffer to get the textures.
 279  *
 280  * This structure along with the notify_invalid_framebuffer
 281  * allows framebuffers to be shared between different threads
 282  * but at the same make the API context free from thread
 283  * synchronization primitves, with the exception of a small
 284  * atomic flag used for notification of framebuffer dirty status.
 285  *
 286  * The thread synchronization is put inside the framebuffer
 287  * and only called once the framebuffer has become dirty.
 288  */
 289 struct st_framebuffer_iface
 290 {
 291    /**
 292     * Atomic stamp which changes when framebuffers need to be updated.
 293     */
 294    int32_t stamp;
 295
 296    /**
 297     * Identifier that uniquely identifies the framebuffer interface object.
 298     */
 299    uint32_t ID;
 300
 301    /**
 302     * The state tracker manager that manages this object.
 303     */
 304    struct st_manager *state_manager;
 305
 306    /**
 307     * Available for the state tracker manager to use.
 308     */
 309    void *st_manager_private;
 310
 311    /**
 312     * The visual of a framebuffer.
 313     */
 314    const struct st_visual *visual;
 315
 316    /**
 317     * Flush the front buffer.
 318     *
 319     * On some window systems, changes to the front buffers are not immediately
 320     * visible.  They need to be flushed.
 321     *
 322     * @att is one of the front buffer attachments.
 323     */
 324    bool (*flush_front)(struct st_context_iface *stctx,
 325                        struct st_framebuffer_iface *stfbi,
 326                        enum st_attachment_type statt);
 327
 328    /**
 329     * The state tracker asks for the textures it needs.
 330     *
 331     * It should try to only ask for attachments that it currently renders
 332     * to, thus allowing the winsys to delay the allocation of textures not
 333     * needed. For example front buffer attachments are not needed if you
 334     * only do back buffer rendering.
 335     *
 336     * The implementor of this function needs to also ensure
 337     * thread safty as this call might be done from multiple threads.
 338     *
 339     * The returned textures are owned by the caller.  They should be
 340     * unreferenced when no longer used.  If this function is called multiple
 341     * times with different sets of attachments, those buffers not included in
 342     * the last call might be destroyed.  This behavior might change in the
 343     * future.
 344     */
 345    bool (*validate)(struct st_context_iface *stctx,
 346                     struct st_framebuffer_iface *stfbi,
 347                     const enum st_attachment_type *statts,
 348                     unsigned count,
 349                     struct pipe_resource **out);
 350    bool (*flush_swapbuffers) (struct st_context_iface *stctx,
 351                               struct st_framebuffer_iface *stfbi);
 352 };
 353
 354 /**
 355  * Represent a rendering context.
 356  *
 357  * This entity is created from st_api and used by the state tracker manager.
 358  */
 359 struct st_context_iface
 360 {
 361    /**
 362     * Available for the state tracker and the manager to use.
 363     */
 364    void *st_context_private;
 365    void *st_manager_private;
 366
 367    /**
 368     * The state tracker manager that manages this object.
 369     */
 370    struct st_manager *state_manager;
 371
 372    /**
 373     * The CSO context associated with this context in case we need to draw
 374     * something before swap buffers.
 375     */
 376    struct cso_context *cso_context;
 377
 378    /**
 379     * The gallium context.
 380     */
 381    struct pipe_context *pipe;
 382
 383    /**
 384     * Destroy the context.
 385     */
 386    void (*destroy)(struct st_context_iface *stctxi);
 387
 388    /**
 389     * Flush all drawing from context to the pipe also flushes the pipe.
 390     */
 391    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 392                  struct pipe_fence_handle **fence);
 393
 394    /**
 395     * Replace the texture image of a texture object at the specified level.
 396     *
 397     * This function is optional.
 398     */
 399    bool (*teximage)(struct st_context_iface *stctxi,
 400                     enum st_texture_type target,
 401                     int level, enum pipe_format internal_format,
 402                     struct pipe_resource *tex, bool mipmap);
 403
 404    /**
 405     * Used to implement glXCopyContext.
 406     */
 407    void (*copy)(struct st_context_iface *stctxi,
 408                 struct st_context_iface *stsrci, unsigned mask);
 409
 410    /**
 411     * Used to implement wglShareLists.
 412     */
 413    bool (*share)(struct st_context_iface *stctxi,
 414                  struct st_context_iface *stsrci);
 415
 416    /**
 417     * Start the thread if the API has a worker thread.
 418     * Called after the context has been created and fully initialized on both
 419     * sides (e.g. st/mesa and st/dri).
 420     */
 421    void (*start_thread)(struct st_context_iface *stctxi);
 422
 423    /**
 424     * If the API is multithreaded, wait for all queued commands to complete.
 425     * Called from the main thread.
 426     */
 427    void (*thread_finish)(struct st_context_iface *stctxi);
 428 };
 429
 430
 431 /**
 432  * Represent a state tracker manager.
 433  *
 434  * This interface is implemented by the state tracker manager.  It corresponds
 435  * to a "display" in the window system.
 436  */
 437 struct st_manager
 438 {
 439    struct pipe_screen *screen;
 440
 441    /**
 442     * Look up and return the info of an EGLImage.
 443     *
 444     * This is used to implement for example EGLImageTargetTexture2DOES.
 445     * The GLeglImageOES agrument of that call is passed directly to this
 446     * function call and the information needed to access this is returned
 447     * in the given struct out.
 448     *
 449     * @smapi: manager owning the caller context
 450     * @stctx: caller context
 451     * @egl_image: EGLImage that caller recived
 452     * @out: return struct filled out with access information.
 453     *
 454     * This function is optional.
 455     */
 456    bool (*get_egl_image)(struct st_manager *smapi,
 457                          void *egl_image,
 458                          struct st_egl_image *out);
 459
 460    /**
 461     * Query an manager param.
 462     */
 463    int (*get_param)(struct st_manager *smapi,
 464                     enum st_manager_param param);
 465
 466    /**
 467     * Call the loader function setBackgroundContext. Called from the worker
 468     * thread.
 469     */
 470    void (*set_background_context)(struct st_context_iface *stctxi,
 471                                   struct util_queue_monitoring *queue_info);
 472
 473    /**
 474     * Destroy any private data used by the state tracker manager.
 475     */
 476    void (*destroy)(struct st_manager *smapi);
 477
 478    /**
 479     * Available for the state tracker manager to use.
 480     */
 481    void *st_manager_private;
 482 };
 483
 484 /**
 485  * Represent a rendering API such as OpenGL or OpenVG.
 486  *
 487  * Implemented by the state tracker and used by the state tracker manager.
 488  */
 489 struct st_api
 490 {
 491    /**
 492     * The name of the rendering API.  This is informative.
 493     */
 494    const char *name;
 495
 496    /**
 497     * The supported rendering API.
 498     */
 499    enum st_api_type api;
 500
 501    /**
 502     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 503     */
 504    unsigned profile_mask;
 505
 506    /**
 507     * The supported optional features.  Tested with ST_FEATURE_*_MASK.
 508     */
 509    unsigned feature_mask;
 510
 511    /**
 512     * Destroy the API.
 513     */
 514    void (*destroy)(struct st_api *stapi);
 515
 516    /**
 517     * Query supported OpenGL versions. (if applicable)
 518     * The format is (major*10+minor).
 519     */
 520    void (*query_versions)(struct st_api *stapi, struct st_manager *sm,
 521                           struct st_config_options *options,
 522                           int *gl_core_version,
 523                           int *gl_compat_version,
 524                           int *gl_es1_version,
 525                           int *gl_es2_version);
 526
 527    /**
 528     * Create a rendering context.
 529     */
 530    struct st_context_iface *(*create_context)(struct st_api *stapi,
 531                                               struct st_manager *smapi,
 532                                               const struct st_context_attribs *attribs,
 533                                               enum st_context_error *error,
 534                                               struct st_context_iface *stsharei);
 535
 536    /**
 537     * Bind the context to the calling thread with draw and read as drawables.
 538     *
 539     * The framebuffers might be NULL, or might have different visuals than the
 540     * context does.
 541     */
 542    bool (*make_current)(struct st_api *stapi,
 543                         struct st_context_iface *stctxi,
 544                         struct st_framebuffer_iface *stdrawi,
 545                         struct st_framebuffer_iface *streadi);
 546
 547    /**
 548     * Get the currently bound context in the calling thread.
 549     */
 550    struct st_context_iface *(*get_current)(struct st_api *stapi);
 551
 552    /**
 553     * Notify the st manager the framebuffer interface object
 554     * is no longer valid.
 555     */
 556    void (*destroy_drawable)(struct st_api *stapi,
 557                             struct st_framebuffer_iface *stfbi);
 558 };
 559
 560 /**
 561  * Return true if the visual has the specified buffers.
 562  */
 563 static inline bool
 564 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 565 {
 566    return ((visual->buffer_mask & mask) == mask);
 567 }
 568
 569 #endif /* _ST_API_H_ */