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 };
 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_framebuffer_iface *stfbi,
 343                        const enum st_attachment_type *statts,
 344                        unsigned count,
 345                        struct pipe_resource **out);
 346 };
 347
 348 /**
 349  * Represent a rendering context.
 350  *
 351  * This entity is created from st_api and used by the state tracker manager.
 352  */
 353 struct st_context_iface
 354 {
 355    /**
 356     * Available for the state tracker and the manager to use.
 357     */
 358    void *st_context_private;
 359    void *st_manager_private;
 360
 361    /**
 362     * The CSO context associated with this context in case we need to draw
 363     * something before swap buffers.
 364     */
 365    struct cso_context *cso_context;
 366
 367    /**
 368     * The gallium context.
 369     */
 370    struct pipe_context *pipe;
 371
 372    /**
 373     * Destroy the context.
 374     */
 375    void (*destroy)(struct st_context_iface *stctxi);
 376
 377    /**
 378     * Flush all drawing from context to the pipe also flushes the pipe.
 379     */
 380    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 381                  struct pipe_fence_handle **fence);
 382
 383    /**
 384     * Replace the texture image of a texture object at the specified level.
 385     *
 386     * This function is optional.
 387     */
 388    boolean (*teximage)(struct st_context_iface *stctxi,
 389                        enum st_texture_type target,
 390                        int level, enum pipe_format internal_format,
 391                        struct pipe_resource *tex, boolean mipmap);
 392
 393    /**
 394     * Used to implement glXCopyContext.
 395     */
 396    void (*copy)(struct st_context_iface *stctxi,
 397                 struct st_context_iface *stsrci, unsigned mask);
 398
 399    /**
 400     * Used to implement wglShareLists.
 401     */
 402    boolean (*share)(struct st_context_iface *stctxi,
 403                     struct st_context_iface *stsrci);
 404
 405    /**
 406     * Look up and return the info of a resource for EGLImage.
 407     *
 408     * This function is optional.
 409     */
 410    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 411                                          struct st_context_resource *stres);
 412 };
 413
 414
 415 /**
 416  * Represent a state tracker manager.
 417  *
 418  * This interface is implemented by the state tracker manager.  It corresponds
 419  * to a "display" in the window system.
 420  */
 421 struct st_manager
 422 {
 423    struct pipe_screen *screen;
 424
 425    /**
 426     * Look up and return the info of an EGLImage.
 427     *
 428     * This is used to implement for example EGLImageTargetTexture2DOES.
 429     * The GLeglImageOES agrument of that call is passed directly to this
 430     * function call and the information needed to access this is returned
 431     * in the given struct out.
 432     *
 433     * @smapi: manager owning the caller context
 434     * @stctx: caller context
 435     * @egl_image: EGLImage that caller recived
 436     * @out: return struct filled out with access information.
 437     *
 438     * This function is optional.
 439     */
 440    boolean (*get_egl_image)(struct st_manager *smapi,
 441                             void *egl_image,
 442                             struct st_egl_image *out);
 443
 444    /**
 445     * Query an manager param.
 446     */
 447    int (*get_param)(struct st_manager *smapi,
 448                     enum st_manager_param param);
 449 };
 450
 451 /**
 452  * Represent a rendering API such as OpenGL or OpenVG.
 453  *
 454  * Implemented by the state tracker and used by the state tracker manager.
 455  */
 456 struct st_api
 457 {
 458    /**
 459     * The name of the rendering API.  This is informative.
 460     */
 461    const char *name;
 462
 463    /**
 464     * The supported rendering API.
 465     */
 466    enum st_api_type api;
 467
 468    /**
 469     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 470     */
 471    unsigned profile_mask;
 472
 473    /**
 474     * The supported optional features.  Tested with ST_FEATURE_*_MASK.
 475     */
 476    unsigned feature_mask;
 477
 478    /**
 479     * Destroy the API.
 480     */
 481    void (*destroy)(struct st_api *stapi);
 482
 483    /**
 484     * Return an API entry point.
 485     *
 486     * For GL this is the same as _glapi_get_proc_address.
 487     */
 488    st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
 489
 490    /**
 491     * Create a rendering context.
 492     */
 493    struct st_context_iface *(*create_context)(struct st_api *stapi,
 494                                               struct st_manager *smapi,
 495                                               const struct st_context_attribs *attribs,
 496                                               enum st_context_error *error,
 497                                               struct st_context_iface *stsharei);
 498
 499    /**
 500     * Bind the context to the calling thread with draw and read as drawables.
 501     *
 502     * The framebuffers might be NULL, or might have different visuals than the
 503     * context does.
 504     */
 505    boolean (*make_current)(struct st_api *stapi,
 506                            struct st_context_iface *stctxi,
 507                            struct st_framebuffer_iface *stdrawi,
 508                            struct st_framebuffer_iface *streadi);
 509
 510    /**
 511     * Get the currently bound context in the calling thread.
 512     */
 513    struct st_context_iface *(*get_current)(struct st_api *stapi);
 514 };
 515
 516 /**
 517  * Return true if the visual has the specified buffers.
 518  */
 519 static INLINE boolean
 520 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 521 {
 522    return ((visual->buffer_mask & mask) == mask);
 523 }
 524
 525 #endif /* _ST_API_H_ */