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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  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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  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
  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 #define ST_FLUSH_WAIT                     (1 << 2)
 164
 165 /**
 166  * Value to st_manager->get_param function.
 167  */
 168 enum st_manager_param {
 169    /**
 170     * The dri state tracker on old libGL's doesn't do the right thing
 171     * with regards to invalidating the framebuffers.
 172     *
 173     * For the mesa state tracker that means that it needs to invalidate
 174     * the framebuffer in glViewport itself.
 175     */
 176    ST_MANAGER_BROKEN_INVALIDATE
 177 };
 178
 179 struct pipe_context;
 180 struct pipe_resource;
 181 struct pipe_fence_handle;
 182
 183 /**
 184  * Used in st_context_iface->get_resource_for_egl_image.
 185  */
 186 struct st_context_resource
 187 {
 188    /* these fields are filled in by the caller */
 189    enum st_context_resource_type type;
 190    void *resource;
 191
 192    /* this is owned by the caller */
 193    struct pipe_resource *texture;
 194 };
 195
 196 /**
 197  * Used in st_manager_iface->get_egl_image.
 198  */
 199 struct st_egl_image
 200 {
 201    /* this is owned by the caller */
 202    struct pipe_resource *texture;
 203
 204    /* format only differs from texture->format for multi-planar (YUV): */
 205    enum pipe_format format;
 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.  Bitfield of ST_ATTACHMENT_*_MASK bits.
 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 disable_blend_func_extended;
 243    boolean disable_glsl_line_continuations;
 244    boolean disable_shader_bit_encoding;
 245    boolean force_glsl_extensions_warn;
 246    unsigned force_glsl_version;
 247    boolean force_s3tc_enable;
 248    boolean allow_glsl_extension_directive_midshader;
 249    boolean allow_higher_compat_version;
 250    boolean glsl_zero_init;
 251    unsigned char config_options_sha1[20];
 252 };
 253
 254 /**
 255  * Represent the attributes of a context.
 256  */
 257 struct st_context_attribs
 258 {
 259    /**
 260     * The profile and minimal version to support.
 261     *
 262     * The valid profiles and versions are rendering API dependent.  The latest
 263     * version satisfying the request should be returned.
 264     */
 265    enum st_profile_type profile;
 266    int major, minor;
 267
 268    /** Mask of ST_CONTEXT_FLAG_x bits */
 269    unsigned flags;
 270
 271    /**
 272     * The visual of the framebuffers the context will be bound to.
 273     */
 274    struct st_visual visual;
 275
 276    /**
 277     * Configuration options.
 278     */
 279    struct st_config_options options;
 280 };
 281
 282 struct st_context_iface;
 283
 284 /**
 285  * Represent a windowing system drawable.
 286  *
 287  * The framebuffer is implemented by the state tracker manager and
 288  * used by the state trackers.
 289  *
 290  * Instead of the winsys poking into the API context to figure
 291  * out what buffers that might be needed in the future by the API
 292  * context, it calls into the framebuffer to get the textures.
 293  *
 294  * This structure along with the notify_invalid_framebuffer
 295  * allows framebuffers to be shared between different threads
 296  * but at the same make the API context free from thread
 297  * synchronization primitves, with the exception of a small
 298  * atomic flag used for notification of framebuffer dirty status.
 299  *
 300  * The thread synchronization is put inside the framebuffer
 301  * and only called once the framebuffer has become dirty.
 302  */
 303 struct st_framebuffer_iface
 304 {
 305    /**
 306     * Atomic stamp which changes when framebuffers need to be updated.
 307     */
 308    int32_t stamp;
 309
 310    /**
 311     * Available for the state tracker manager to use.
 312     */
 313    void *st_manager_private;
 314
 315    /**
 316     * The visual of a framebuffer.
 317     */
 318    const struct st_visual *visual;
 319
 320    /**
 321     * Flush the front buffer.
 322     *
 323     * On some window systems, changes to the front buffers are not immediately
 324     * visible.  They need to be flushed.
 325     *
 326     * @att is one of the front buffer attachments.
 327     */
 328    boolean (*flush_front)(struct st_context_iface *stctx,
 329                           struct st_framebuffer_iface *stfbi,
 330                           enum st_attachment_type statt);
 331
 332    /**
 333     * The state tracker asks for the textures it needs.
 334     *
 335     * It should try to only ask for attachments that it currently renders
 336     * to, thus allowing the winsys to delay the allocation of textures not
 337     * needed. For example front buffer attachments are not needed if you
 338     * only do back buffer rendering.
 339     *
 340     * The implementor of this function needs to also ensure
 341     * thread safty as this call might be done from multiple threads.
 342     *
 343     * The returned textures are owned by the caller.  They should be
 344     * unreferenced when no longer used.  If this function is called multiple
 345     * times with different sets of attachments, those buffers not included in
 346     * the last call might be destroyed.  This behavior might change in the
 347     * future.
 348     */
 349    boolean (*validate)(struct st_context_iface *stctx,
 350                        struct st_framebuffer_iface *stfbi,
 351                        const enum st_attachment_type *statts,
 352                        unsigned count,
 353                        struct pipe_resource **out);
 354 };
 355
 356 /**
 357  * Represent a rendering context.
 358  *
 359  * This entity is created from st_api and used by the state tracker manager.
 360  */
 361 struct st_context_iface
 362 {
 363    /**
 364     * Available for the state tracker and the manager to use.
 365     */
 366    void *st_context_private;
 367    void *st_manager_private;
 368
 369    /**
 370     * The CSO context associated with this context in case we need to draw
 371     * something before swap buffers.
 372     */
 373    struct cso_context *cso_context;
 374
 375    /**
 376     * The gallium context.
 377     */
 378    struct pipe_context *pipe;
 379
 380    /**
 381     * Destroy the context.
 382     */
 383    void (*destroy)(struct st_context_iface *stctxi);
 384
 385    /**
 386     * Flush all drawing from context to the pipe also flushes the pipe.
 387     */
 388    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 389                  struct pipe_fence_handle **fence);
 390
 391    /**
 392     * Replace the texture image of a texture object at the specified level.
 393     *
 394     * This function is optional.
 395     */
 396    boolean (*teximage)(struct st_context_iface *stctxi,
 397                        enum st_texture_type target,
 398                        int level, enum pipe_format internal_format,
 399                        struct pipe_resource *tex, boolean mipmap);
 400
 401    /**
 402     * Used to implement glXCopyContext.
 403     */
 404    void (*copy)(struct st_context_iface *stctxi,
 405                 struct st_context_iface *stsrci, unsigned mask);
 406
 407    /**
 408     * Used to implement wglShareLists.
 409     */
 410    boolean (*share)(struct st_context_iface *stctxi,
 411                     struct st_context_iface *stsrci);
 412
 413    /**
 414     * Look up and return the info of a resource for EGLImage.
 415     *
 416     * This function is optional.
 417     */
 418    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 419                                          struct st_context_resource *stres);
 420 };
 421
 422
 423 /**
 424  * Represent a state tracker manager.
 425  *
 426  * This interface is implemented by the state tracker manager.  It corresponds
 427  * to a "display" in the window system.
 428  */
 429 struct st_manager
 430 {
 431    struct pipe_screen *screen;
 432
 433    /**
 434     * Look up and return the info of an EGLImage.
 435     *
 436     * This is used to implement for example EGLImageTargetTexture2DOES.
 437     * The GLeglImageOES agrument of that call is passed directly to this
 438     * function call and the information needed to access this is returned
 439     * in the given struct out.
 440     *
 441     * @smapi: manager owning the caller context
 442     * @stctx: caller context
 443     * @egl_image: EGLImage that caller recived
 444     * @out: return struct filled out with access information.
 445     *
 446     * This function is optional.
 447     */
 448    boolean (*get_egl_image)(struct st_manager *smapi,
 449                             void *egl_image,
 450                             struct st_egl_image *out);
 451
 452    /**
 453     * Query an manager param.
 454     */
 455    int (*get_param)(struct st_manager *smapi,
 456                     enum st_manager_param param);
 457 };
 458
 459 /**
 460  * Represent a rendering API such as OpenGL or OpenVG.
 461  *
 462  * Implemented by the state tracker and used by the state tracker manager.
 463  */
 464 struct st_api
 465 {
 466    /**
 467     * The name of the rendering API.  This is informative.
 468     */
 469    const char *name;
 470
 471    /**
 472     * The supported rendering API.
 473     */
 474    enum st_api_type api;
 475
 476    /**
 477     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 478     */
 479    unsigned profile_mask;
 480
 481    /**
 482     * The supported optional features.  Tested with ST_FEATURE_*_MASK.
 483     */
 484    unsigned feature_mask;
 485
 486    /**
 487     * Destroy the API.
 488     */
 489    void (*destroy)(struct st_api *stapi);
 490
 491    /**
 492     * Query supported OpenGL versions. (if applicable)
 493     * The format is (major*10+minor).
 494     */
 495    void (*query_versions)(struct st_api *stapi, struct st_manager *sm,
 496                           struct st_config_options *options,
 497                           int *gl_core_version,
 498                           int *gl_compat_version,
 499                           int *gl_es1_version,
 500                           int *gl_es2_version);
 501
 502    /**
 503     * Create a rendering context.
 504     */
 505    struct st_context_iface *(*create_context)(struct st_api *stapi,
 506                                               struct st_manager *smapi,
 507                                               const struct st_context_attribs *attribs,
 508                                               enum st_context_error *error,
 509                                               struct st_context_iface *stsharei);
 510
 511    /**
 512     * Bind the context to the calling thread with draw and read as drawables.
 513     *
 514     * The framebuffers might be NULL, or might have different visuals than the
 515     * context does.
 516     */
 517    boolean (*make_current)(struct st_api *stapi,
 518                            struct st_context_iface *stctxi,
 519                            struct st_framebuffer_iface *stdrawi,
 520                            struct st_framebuffer_iface *streadi);
 521
 522    /**
 523     * Get the currently bound context in the calling thread.
 524     */
 525    struct st_context_iface *(*get_current)(struct st_api *stapi);
 526 };
 527
 528 /**
 529  * Return true if the visual has the specified buffers.
 530  */
 531 static inline boolean
 532 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 533 {
 534    return ((visual->buffer_mask & mask) == mask);
 535 }
 536
 537 #endif /* _ST_API_H_ */