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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  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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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
  94 /**
  95  * Reasons that context creation might fail.
  96  */
  97 enum st_context_error {
  98    ST_CONTEXT_SUCCESS = 0,
  99    ST_CONTEXT_ERROR_NO_MEMORY,
 100    ST_CONTEXT_ERROR_BAD_API,
 101    ST_CONTEXT_ERROR_BAD_VERSION,
 102    ST_CONTEXT_ERROR_BAD_FLAG,
 103    ST_CONTEXT_ERROR_UNKNOWN_ATTRIBUTE,
 104    ST_CONTEXT_ERROR_UNKNOWN_FLAG
 105 };
 106
 107 /**
 108  * Used in st_context_iface->teximage.
 109  */
 110 enum st_texture_type {
 111    ST_TEXTURE_1D,
 112    ST_TEXTURE_2D,
 113    ST_TEXTURE_3D,
 114    ST_TEXTURE_RECT
 115 };
 116
 117 /**
 118  * Available attachments of framebuffer.
 119  */
 120 enum st_attachment_type {
 121    ST_ATTACHMENT_FRONT_LEFT,
 122    ST_ATTACHMENT_BACK_LEFT,
 123    ST_ATTACHMENT_FRONT_RIGHT,
 124    ST_ATTACHMENT_BACK_RIGHT,
 125    ST_ATTACHMENT_DEPTH_STENCIL,
 126    ST_ATTACHMENT_ACCUM,
 127    ST_ATTACHMENT_SAMPLE,
 128
 129    ST_ATTACHMENT_COUNT,
 130    ST_ATTACHMENT_INVALID = -1
 131 };
 132
 133 /* for buffer_mask in st_visual */
 134 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
 135 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
 136 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
 137 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
 138 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
 139 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
 140 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
 141
 142 /**
 143  * Enumerations of state tracker context resources.
 144  */
 145 enum st_context_resource_type {
 146    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
 147    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
 148    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
 149    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 150    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 151    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 152    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 153    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 154    ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
 155    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
 156 };
 157
 158 /**
 159  * Flush flags.
 160  */
 161 #define ST_FLUSH_FRONT                    (1 << 0)
 162 #define ST_FLUSH_END_OF_FRAME             (1 << 1)
 163
 164 /**
 165  * Value to st_manager->get_param function.
 166  */
 167 enum st_manager_param {
 168    /**
 169     * The dri state tracker on old libGL's doesn't do the right thing
 170     * with regards to invalidating the framebuffers.
 171     *
 172     * For the mesa state tracker that means that it needs to invalidate
 173     * the framebuffer in glViewport itself.
 174     */
 175    ST_MANAGER_BROKEN_INVALIDATE
 176 };
 177
 178 struct pipe_context;
 179 struct pipe_resource;
 180 struct pipe_fence_handle;
 181
 182 /**
 183  * Used in st_context_iface->get_resource_for_egl_image.
 184  */
 185 struct st_context_resource
 186 {
 187    /* these fields are filled in by the caller */
 188    enum st_context_resource_type type;
 189    void *resource;
 190
 191    /* this is owned by the caller */
 192    struct pipe_resource *texture;
 193 };
 194
 195 /**
 196  * Used in st_manager_iface->get_egl_image.
 197  */
 198 struct st_egl_image
 199 {
 200    /* this is owned by the caller */
 201    struct pipe_resource *texture;
 202
 203    unsigned level;
 204    unsigned layer;
 205 };
 206
 207 /**
 208  * Represent the visual of a framebuffer.
 209  */
 210 struct st_visual
 211 {
 212    /**
 213     * Available buffers.  Tested with ST_FRAMEBUFFER_*_MASK.
 214     */
 215    unsigned buffer_mask;
 216
 217    /**
 218     * Buffer formats.  The formats are always set even when the buffer is
 219     * not available.
 220     */
 221    enum pipe_format color_format;
 222    enum pipe_format depth_stencil_format;
 223    enum pipe_format accum_format;
 224    int samples;
 225
 226    /**
 227     * Desired render buffer.
 228     */
 229    enum st_attachment_type render_buffer;
 230 };
 231
 232
 233 /**
 234  * Configuration options from driconf
 235  */
 236 struct st_config_options
 237 {
 238    boolean disable_blend_func_extended;
 239    boolean disable_glsl_line_continuations;
 240    boolean disable_shader_bit_encoding;
 241    boolean force_glsl_extensions_warn;
 242    unsigned force_glsl_version;
 243    boolean force_s3tc_enable;
 244    boolean allow_glsl_extension_directive_midshader;
 245 };
 246
 247 /**
 248  * Represent the attributes of a context.
 249  */
 250 struct st_context_attribs
 251 {
 252    /**
 253     * The profile and minimal version to support.
 254     *
 255     * The valid profiles and versions are rendering API dependent.  The latest
 256     * version satisfying the request should be returned.
 257     */
 258    enum st_profile_type profile;
 259    int major, minor;
 260
 261    /** Mask of ST_CONTEXT_FLAG_x bits */
 262    unsigned flags;
 263
 264    /**
 265     * The visual of the framebuffers the context will be bound to.
 266     */
 267    struct st_visual visual;
 268
 269    /**
 270     * Configuration options.
 271     */
 272    struct st_config_options options;
 273 };
 274
 275 struct st_context_iface;
 276
 277 /**
 278  * Represent a windowing system drawable.
 279  *
 280  * The framebuffer is implemented by the state tracker manager and
 281  * used by the state trackers.
 282  *
 283  * Instead of the winsys poking into the API context to figure
 284  * out what buffers that might be needed in the future by the API
 285  * context, it calls into the framebuffer to get the textures.
 286  *
 287  * This structure along with the notify_invalid_framebuffer
 288  * allows framebuffers to be shared between different threads
 289  * but at the same make the API context free from thread
 290  * synchronization primitves, with the exception of a small
 291  * atomic flag used for notification of framebuffer dirty status.
 292  *
 293  * The thread synchronization is put inside the framebuffer
 294  * and only called once the framebuffer has become dirty.
 295  */
 296 struct st_framebuffer_iface
 297 {
 298    /**
 299     * Atomic stamp which changes when framebuffers need to be updated.
 300     */
 301    int32_t stamp;
 302
 303    /**
 304     * Available for the state tracker manager to use.
 305     */
 306    void *st_manager_private;
 307
 308    /**
 309     * The visual of a framebuffer.
 310     */
 311    const struct st_visual *visual;
 312
 313    /**
 314     * Flush the front buffer.
 315     *
 316     * On some window systems, changes to the front buffers are not immediately
 317     * visible.  They need to be flushed.
 318     *
 319     * @att is one of the front buffer attachments.
 320     */
 321    boolean (*flush_front)(struct st_context_iface *stctx,
 322                           struct st_framebuffer_iface *stfbi,
 323                           enum st_attachment_type statt);
 324
 325    /**
 326     * The state tracker asks for the textures it needs.
 327     *
 328     * It should try to only ask for attachments that it currently renders
 329     * to, thus allowing the winsys to delay the allocation of textures not
 330     * needed. For example front buffer attachments are not needed if you
 331     * only do back buffer rendering.
 332     *
 333     * The implementor of this function needs to also ensure
 334     * thread safty as this call might be done from multiple threads.
 335     *
 336     * The returned textures are owned by the caller.  They should be
 337     * unreferenced when no longer used.  If this function is called multiple
 338     * times with different sets of attachments, those buffers not included in
 339     * the last call might be destroyed.  This behavior might change in the
 340     * future.
 341     */
 342    boolean (*validate)(struct st_context_iface *stctx,
 343                        struct st_framebuffer_iface *stfbi,
 344                        const enum st_attachment_type *statts,
 345                        unsigned count,
 346                        struct pipe_resource **out);
 347 };
 348
 349 /**
 350  * Represent a rendering context.
 351  *
 352  * This entity is created from st_api and used by the state tracker manager.
 353  */
 354 struct st_context_iface
 355 {
 356    /**
 357     * Available for the state tracker and the manager to use.
 358     */
 359    void *st_context_private;
 360    void *st_manager_private;
 361
 362    /**
 363     * The CSO context associated with this context in case we need to draw
 364     * something before swap buffers.
 365     */
 366    struct cso_context *cso_context;
 367
 368    /**
 369     * The gallium context.
 370     */
 371    struct pipe_context *pipe;
 372
 373    /**
 374     * Destroy the context.
 375     */
 376    void (*destroy)(struct st_context_iface *stctxi);
 377
 378    /**
 379     * Flush all drawing from context to the pipe also flushes the pipe.
 380     */
 381    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 382                  struct pipe_fence_handle **fence);
 383
 384    /**
 385     * Replace the texture image of a texture object at the specified level.
 386     *
 387     * This function is optional.
 388     */
 389    boolean (*teximage)(struct st_context_iface *stctxi,
 390                        enum st_texture_type target,
 391                        int level, enum pipe_format internal_format,
 392                        struct pipe_resource *tex, boolean mipmap);
 393
 394    /**
 395     * Used to implement glXCopyContext.
 396     */
 397    void (*copy)(struct st_context_iface *stctxi,
 398                 struct st_context_iface *stsrci, unsigned mask);
 399
 400    /**
 401     * Used to implement wglShareLists.
 402     */
 403    boolean (*share)(struct st_context_iface *stctxi,
 404                     struct st_context_iface *stsrci);
 405
 406    /**
 407     * Look up and return the info of a resource for EGLImage.
 408     *
 409     * This function is optional.
 410     */
 411    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 412                                          struct st_context_resource *stres);
 413 };
 414
 415
 416 /**
 417  * Represent a state tracker manager.
 418  *
 419  * This interface is implemented by the state tracker manager.  It corresponds
 420  * to a "display" in the window system.
 421  */
 422 struct st_manager
 423 {
 424    struct pipe_screen *screen;
 425
 426    /**
 427     * Look up and return the info of an EGLImage.
 428     *
 429     * This is used to implement for example EGLImageTargetTexture2DOES.
 430     * The GLeglImageOES agrument of that call is passed directly to this
 431     * function call and the information needed to access this is returned
 432     * in the given struct out.
 433     *
 434     * @smapi: manager owning the caller context
 435     * @stctx: caller context
 436     * @egl_image: EGLImage that caller recived
 437     * @out: return struct filled out with access information.
 438     *
 439     * This function is optional.
 440     */
 441    boolean (*get_egl_image)(struct st_manager *smapi,
 442                             void *egl_image,
 443                             struct st_egl_image *out);
 444
 445    /**
 446     * Query an manager param.
 447     */
 448    int (*get_param)(struct st_manager *smapi,
 449                     enum st_manager_param param);
 450 };
 451
 452 /**
 453  * Represent a rendering API such as OpenGL or OpenVG.
 454  *
 455  * Implemented by the state tracker and used by the state tracker manager.
 456  */
 457 struct st_api
 458 {
 459    /**
 460     * The name of the rendering API.  This is informative.
 461     */
 462    const char *name;
 463
 464    /**
 465     * The supported rendering API.
 466     */
 467    enum st_api_type api;
 468
 469    /**
 470     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 471     */
 472    unsigned profile_mask;
 473
 474    /**
 475     * The supported optional features.  Tested with ST_FEATURE_*_MASK.
 476     */
 477    unsigned feature_mask;
 478
 479    /**
 480     * Destroy the API.
 481     */
 482    void (*destroy)(struct st_api *stapi);
 483
 484    /**
 485     * Query supported OpenGL versions. (if applicable)
 486     * The format is (major*10+minor).
 487     */
 488    void (*query_versions)(struct st_api *stapi, struct st_manager *sm,
 489                           struct st_config_options *options,
 490                           int *gl_core_version,
 491                           int *gl_compat_version,
 492                           int *gl_es1_version,
 493                           int *gl_es2_version);
 494
 495    /**
 496     * Create a rendering context.
 497     */
 498    struct st_context_iface *(*create_context)(struct st_api *stapi,
 499                                               struct st_manager *smapi,
 500                                               const struct st_context_attribs *attribs,
 501                                               enum st_context_error *error,
 502                                               struct st_context_iface *stsharei);
 503
 504    /**
 505     * Bind the context to the calling thread with draw and read as drawables.
 506     *
 507     * The framebuffers might be NULL, or might have different visuals than the
 508     * context does.
 509     */
 510    boolean (*make_current)(struct st_api *stapi,
 511                            struct st_context_iface *stctxi,
 512                            struct st_framebuffer_iface *stdrawi,
 513                            struct st_framebuffer_iface *streadi);
 514
 515    /**
 516     * Get the currently bound context in the calling thread.
 517     */
 518    struct st_context_iface *(*get_current)(struct st_api *stapi);
 519 };
 520
 521 /**
 522  * Return true if the visual has the specified buffers.
 523  */
 524 static inline boolean
 525 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 526 {
 527    return ((visual->buffer_mask & mask) == mask);
 528 }
 529
 530 #endif /* _ST_API_H_ */