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
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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
  93 /**
  94  * Reasons that context creation might fail.
  95  */
  96 enum st_context_error {
  97    ST_CONTEXT_SUCCESS = 0,
  98    ST_CONTEXT_ERROR_NO_MEMORY,
  99    ST_CONTEXT_ERROR_BAD_API,
 100    ST_CONTEXT_ERROR_BAD_VERSION,
 101    ST_CONTEXT_ERROR_BAD_FLAG,
 102    ST_CONTEXT_ERROR_UNKNOWN_ATTRIBUTE,
 103    ST_CONTEXT_ERROR_UNKNOWN_FLAG
 104 };
 105
 106 /**
 107  * Used in st_context_iface->teximage.
 108  */
 109 enum st_texture_type {
 110    ST_TEXTURE_1D,
 111    ST_TEXTURE_2D,
 112    ST_TEXTURE_3D,
 113    ST_TEXTURE_RECT
 114 };
 115
 116 /**
 117  * Available attachments of framebuffer.
 118  */
 119 enum st_attachment_type {
 120    ST_ATTACHMENT_FRONT_LEFT,
 121    ST_ATTACHMENT_BACK_LEFT,
 122    ST_ATTACHMENT_FRONT_RIGHT,
 123    ST_ATTACHMENT_BACK_RIGHT,
 124    ST_ATTACHMENT_DEPTH_STENCIL,
 125    ST_ATTACHMENT_ACCUM,
 126    ST_ATTACHMENT_SAMPLE,
 127
 128    ST_ATTACHMENT_COUNT,
 129    ST_ATTACHMENT_INVALID = -1
 130 };
 131
 132 /* for buffer_mask in st_visual */
 133 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
 134 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
 135 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
 136 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
 137 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
 138 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
 139 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
 140
 141 /**
 142  * Enumerations of state tracker context resources.
 143  */
 144 enum st_context_resource_type {
 145    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
 146    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
 147    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
 148    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 149    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 150    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 151    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 152    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 153    ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
 154    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
 155 };
 156
 157 /**
 158  * Flush flags.
 159  */
 160 #define ST_FLUSH_FRONT                    (1 << 0)
 161 #define ST_FLUSH_END_OF_FRAME             (1 << 1)
 162
 163 /**
 164  * Value to st_manager->get_param function.
 165  */
 166 enum st_manager_param {
 167    /**
 168     * The dri state tracker on old libGL's doesn't do the right thing
 169     * with regards to invalidating the framebuffers.
 170     *
 171     * For the mesa state tracker that means that it needs to invalidate
 172     * the framebuffer in glViewport itself.
 173     */
 174    ST_MANAGER_BROKEN_INVALIDATE
 175 };
 176
 177 /**
 178  * The return type of st_api->get_proc_address.
 179  */
 180 typedef void (*st_proc_t)(void);
 181
 182 struct pipe_context;
 183 struct pipe_resource;
 184 struct pipe_fence_handle;
 185
 186 /**
 187  * Used in st_context_iface->get_resource_for_egl_image.
 188  */
 189 struct st_context_resource
 190 {
 191    /* these fields are filled in by the caller */
 192    enum st_context_resource_type type;
 193    void *resource;
 194
 195    /* this is owned by the caller */
 196    struct pipe_resource *texture;
 197 };
 198
 199 /**
 200  * Used in st_manager_iface->get_egl_image.
 201  */
 202 struct st_egl_image
 203 {
 204    /* this is owned by the caller */
 205    struct pipe_resource *texture;
 206
 207    unsigned level;
 208    unsigned layer;
 209 };
 210
 211 /**
 212  * Represent the visual of a framebuffer.
 213  */
 214 struct st_visual
 215 {
 216    /**
 217     * Available buffers.  Tested with ST_FRAMEBUFFER_*_MASK.
 218     */
 219    unsigned buffer_mask;
 220
 221    /**
 222     * Buffer formats.  The formats are always set even when the buffer is
 223     * not available.
 224     */
 225    enum pipe_format color_format;
 226    enum pipe_format depth_stencil_format;
 227    enum pipe_format accum_format;
 228    int samples;
 229
 230    /**
 231     * Desired render buffer.
 232     */
 233    enum st_attachment_type render_buffer;
 234 };
 235
 236
 237 /**
 238  * Configuration options from driconf
 239  */
 240 struct st_config_options
 241 {
 242    boolean force_glsl_extensions_warn;
 243    boolean disable_glsl_line_continuations;
 244    boolean disable_blend_func_extended;
 245    boolean force_s3tc_enable;
 246 };
 247
 248 /**
 249  * Represent the attributes of a context.
 250  */
 251 struct st_context_attribs
 252 {
 253    /**
 254     * The profile and minimal version to support.
 255     *
 256     * The valid profiles and versions are rendering API dependent.  The latest
 257     * version satisfying the request should be returned.
 258     */
 259    enum st_profile_type profile;
 260    int major, minor;
 261
 262    /** Mask of ST_CONTEXT_FLAG_x bits */
 263    unsigned flags;
 264
 265    /**
 266     * The visual of the framebuffers the context will be bound to.
 267     */
 268    struct st_visual visual;
 269
 270    /**
 271     * Configuration options.
 272     */
 273    struct st_config_options options;
 274 };
 275
 276 struct st_context_iface;
 277
 278 /**
 279  * Represent a windowing system drawable.
 280  *
 281  * The framebuffer is implemented by the state tracker manager and
 282  * used by the state trackers.
 283  *
 284  * Instead of the winsys poking into the API context to figure
 285  * out what buffers that might be needed in the future by the API
 286  * context, it calls into the framebuffer to get the textures.
 287  *
 288  * This structure along with the notify_invalid_framebuffer
 289  * allows framebuffers to be shared between different threads
 290  * but at the same make the API context free from thread
 291  * synchronization primitves, with the exception of a small
 292  * atomic flag used for notification of framebuffer dirty status.
 293  *
 294  * The thread synchronization is put inside the framebuffer
 295  * and only called once the framebuffer has become dirty.
 296  */
 297 struct st_framebuffer_iface
 298 {
 299    /**
 300     * Atomic stamp which changes when framebuffers need to be updated.
 301     */
 302    int32_t stamp;
 303
 304    /**
 305     * Available for the state tracker manager to use.
 306     */
 307    void *st_manager_private;
 308
 309    /**
 310     * The visual of a framebuffer.
 311     */
 312    const struct st_visual *visual;
 313
 314    /**
 315     * Flush the front buffer.
 316     *
 317     * On some window systems, changes to the front buffers are not immediately
 318     * visible.  They need to be flushed.
 319     *
 320     * @att is one of the front buffer attachments.
 321     */
 322    boolean (*flush_front)(struct st_context_iface *stctx,
 323                           struct st_framebuffer_iface *stfbi,
 324                           enum st_attachment_type statt);
 325
 326    /**
 327     * The state tracker asks for the textures it needs.
 328     *
 329     * It should try to only ask for attachments that it currently renders
 330     * to, thus allowing the winsys to delay the allocation of textures not
 331     * needed. For example front buffer attachments are not needed if you
 332     * only do back buffer rendering.
 333     *
 334     * The implementor of this function needs to also ensure
 335     * thread safty as this call might be done from multiple threads.
 336     *
 337     * The returned textures are owned by the caller.  They should be
 338     * unreferenced when no longer used.  If this function is called multiple
 339     * times with different sets of attachments, those buffers not included in
 340     * the last call might be destroyed.  This behavior might change in the
 341     * future.
 342     */
 343    boolean (*validate)(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     * Return an API entry point.
 486     *
 487     * For GL this is the same as _glapi_get_proc_address.
 488     */
 489    st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
 490
 491    /**
 492     * Create a rendering context.
 493     */
 494    struct st_context_iface *(*create_context)(struct st_api *stapi,
 495                                               struct st_manager *smapi,
 496                                               const struct st_context_attribs *attribs,
 497                                               enum st_context_error *error,
 498                                               struct st_context_iface *stsharei);
 499
 500    /**
 501     * Bind the context to the calling thread with draw and read as drawables.
 502     *
 503     * The framebuffers might be NULL, or might have different visuals than the
 504     * context does.
 505     */
 506    boolean (*make_current)(struct st_api *stapi,
 507                            struct st_context_iface *stctxi,
 508                            struct st_framebuffer_iface *stdrawi,
 509                            struct st_framebuffer_iface *streadi);
 510
 511    /**
 512     * Get the currently bound context in the calling thread.
 513     */
 514    struct st_context_iface *(*get_current)(struct st_api *stapi);
 515 };
 516
 517 /**
 518  * Return true if the visual has the specified buffers.
 519  */
 520 static INLINE boolean
 521 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 522 {
 523    return ((visual->buffer_mask & mask) == mask);
 524 }
 525
 526 #endif /* _ST_API_H_ */