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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  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,
  61    ST_PROFILE_OPENGL_CORE,
  62    ST_PROFILE_OPENGL_ES1,
  63    ST_PROFILE_OPENGL_ES2
  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  * New context flags for GL 3.0 and beyond.
  74  */
  75 #define ST_CONTEXT_FLAG_CORE_PROFILE        (1 << 0)
  76 #define ST_CONTEXT_FLAG_COMPATIBLE_PROFILE  (1 << 1)
  77 #define ST_CONTEXT_FLAG_FORWARD_COMPATIBLE  (1 << 2)
  78 #define ST_CONTEXT_FLAG_DEBUG               (1 << 3)
  79 #define ST_CONTEXT_FLAG_ROBUST_ACCESS       (1 << 4)
  80
  81 /**
  82  * Used in st_context_iface->teximage.
  83  */
  84 enum st_texture_type {
  85    ST_TEXTURE_1D,
  86    ST_TEXTURE_2D,
  87    ST_TEXTURE_3D,
  88    ST_TEXTURE_RECT
  89 };
  90
  91 /**
  92  * Available attachments of framebuffer.
  93  */
  94 enum st_attachment_type {
  95    ST_ATTACHMENT_FRONT_LEFT,
  96    ST_ATTACHMENT_BACK_LEFT,
  97    ST_ATTACHMENT_FRONT_RIGHT,
  98    ST_ATTACHMENT_BACK_RIGHT,
  99    ST_ATTACHMENT_DEPTH_STENCIL,
 100    ST_ATTACHMENT_ACCUM,
 101    ST_ATTACHMENT_SAMPLE,
 102
 103    ST_ATTACHMENT_COUNT,
 104    ST_ATTACHMENT_INVALID = -1
 105 };
 106
 107 /* for buffer_mask in st_visual */
 108 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
 109 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
 110 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
 111 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
 112 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
 113 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
 114 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
 115
 116 /**
 117  * Enumerations of state tracker context resources.
 118  */
 119 enum st_context_resource_type {
 120    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
 121    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
 122    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
 123    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 124    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 125    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 126    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 127    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 128    ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
 129    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
 130 };
 131
 132 /**
 133  * Flush flags.
 134  */
 135 #define ST_FLUSH_FRONT                    (1 << 0)
 136
 137 /**
 138  * Value to st_manager->get_param function.
 139  */
 140 enum st_manager_param {
 141    /**
 142     * The dri state tracker on old libGL's doesn't do the right thing
 143     * with regards to invalidating the framebuffers.
 144     *
 145     * For the mesa state tracker that means that it needs to invalidate
 146     * the framebuffer in glViewport itself.
 147     */
 148    ST_MANAGER_BROKEN_INVALIDATE
 149 };
 150
 151 /**
 152  * The return type of st_api->get_proc_address.
 153  */
 154 typedef void (*st_proc_t)(void);
 155
 156 struct pipe_context;
 157 struct pipe_resource;
 158 struct pipe_fence_handle;
 159
 160 /**
 161  * Used in st_context_iface->get_resource_for_egl_image.
 162  */
 163 struct st_context_resource
 164 {
 165    /* these fields are filled by the caller */
 166    enum st_context_resource_type type;
 167    void *resource;
 168
 169    /* this is owned by the caller */
 170    struct pipe_resource *texture;
 171 };
 172
 173 /**
 174  * Used in st_manager_iface->get_egl_image.
 175  */
 176 struct st_egl_image
 177 {
 178    /* this is owned by the caller */
 179    struct pipe_resource *texture;
 180
 181    unsigned level;
 182    unsigned layer;
 183 };
 184
 185 /**
 186  * Represent the visual of a framebuffer.
 187  */
 188 struct st_visual
 189 {
 190    /**
 191     * Available buffers.  Tested with ST_FRAMEBUFFER_*_MASK.
 192     */
 193    unsigned buffer_mask;
 194
 195    /**
 196     * Buffer formats.  The formats are always set even when the buffer is
 197     * not available.
 198     */
 199    enum pipe_format color_format;
 200    enum pipe_format depth_stencil_format;
 201    enum pipe_format accum_format;
 202    int samples;
 203
 204    /**
 205     * Desired render buffer.
 206     */
 207    enum st_attachment_type render_buffer;
 208 };
 209
 210 /**
 211  * Represent the attributes of a context.
 212  */
 213 struct st_context_attribs
 214 {
 215    /**
 216     * The profile and minimal version to support.
 217     *
 218     * The valid profiles and versions are rendering API dependent.  The latest
 219     * version satisfying the request should be returned, unless the
 220     * ST_CONTEXT_FLAG_FORWARD_COMPATIBLE bit is set.
 221     */
 222    enum st_profile_type profile;
 223    int major, minor;
 224
 225    /** Mask of ST_CONTEXT_FLAG_x bits */
 226    unsigned flags;
 227
 228    /**
 229     * The visual of the framebuffers the context will be bound to.
 230     */
 231    struct st_visual visual;
 232 };
 233
 234 /**
 235  * Represent a windowing system drawable.
 236  *
 237  * The framebuffer is implemented by the state tracker manager and
 238  * used by the state trackers.
 239  *
 240  * Instead of the winsys pokeing into the API context to figure
 241  * out what buffers that might be needed in the future by the API
 242  * context, it calls into the framebuffer to get the textures.
 243  *
 244  * This structure along with the notify_invalid_framebuffer
 245  * allows framebuffers to be shared between different threads
 246  * but at the same make the API context free from thread
 247  * syncronisation primitves, with the exception of a small
 248  * atomic flag used for notification of framebuffer dirty status.
 249  *
 250  * The thread syncronisation is put inside the framebuffer
 251  * and only called once the framebuffer has become dirty.
 252  */
 253 struct st_framebuffer_iface
 254 {
 255    /**
 256     * Atomic stamp which changes when framebuffers need to be updated.
 257     */
 258
 259    int32_t stamp;
 260
 261    /**
 262     * Available for the state tracker manager to use.
 263     */
 264    void *st_manager_private;
 265
 266    /**
 267     * The visual of a framebuffer.
 268     */
 269    const struct st_visual *visual;
 270
 271    /**
 272     * Flush the front buffer.
 273     *
 274     * On some window systems, changes to the front buffers are not immediately
 275     * visible.  They need to be flushed.
 276     *
 277     * @att is one of the front buffer attachments.
 278     */
 279    boolean (*flush_front)(struct st_framebuffer_iface *stfbi,
 280                           enum st_attachment_type statt);
 281
 282    /**
 283     * The state tracker asks for the textures it needs.
 284     *
 285     * It should try to only ask for attachments that it currently renders
 286     * to, thus allowing the winsys to delay the allocation of textures not
 287     * needed. For example front buffer attachments are not needed if you
 288     * only do back buffer rendering.
 289     *
 290     * The implementor of this function needs to also ensure
 291     * thread safty as this call might be done from multiple threads.
 292     *
 293     * The returned textures are owned by the caller.  They should be
 294     * unreferenced when no longer used.  If this function is called multiple
 295     * times with different sets of attachments, those buffers not included in
 296     * the last call might be destroyed.  This behavior might change in the
 297     * future.
 298     */
 299    boolean (*validate)(struct st_framebuffer_iface *stfbi,
 300                        const enum st_attachment_type *statts,
 301                        unsigned count,
 302                        struct pipe_resource **out);
 303 };
 304
 305 /**
 306  * Represent a rendering context.
 307  *
 308  * This entity is created from st_api and used by the state tracker manager.
 309  */
 310 struct st_context_iface
 311 {
 312    /**
 313     * Available for the state tracker and the manager to use.
 314     */
 315    void *st_context_private;
 316    void *st_manager_private;
 317
 318    /**
 319     * Destroy the context.
 320     */
 321    void (*destroy)(struct st_context_iface *stctxi);
 322
 323    /**
 324     * Flush all drawing from context to the pipe also flushes the pipe.
 325     */
 326    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 327                  struct pipe_fence_handle **fence);
 328
 329    /**
 330     * Replace the texture image of a texture object at the specified level.
 331     *
 332     * This function is optional.
 333     */
 334    boolean (*teximage)(struct st_context_iface *stctxi, enum st_texture_type target,
 335                        int level, enum pipe_format internal_format,
 336                        struct pipe_resource *tex, boolean mipmap);
 337
 338    /**
 339     * Used to implement glXCopyContext.
 340     */
 341    void (*copy)(struct st_context_iface *stctxi,
 342                 struct st_context_iface *stsrci, unsigned mask);
 343
 344    /**
 345     * Used to implement wglShareLists.
 346     */
 347    boolean (*share)(struct st_context_iface *stctxi,
 348                     struct st_context_iface *stsrci);
 349
 350    /**
 351     * Look up and return the info of a resource for EGLImage.
 352     *
 353     * This function is optional.
 354     */
 355    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 356                                          struct st_context_resource *stres);
 357 };
 358
 359
 360 /**
 361  * Represent a state tracker manager.
 362  *
 363  * This interface is implemented by the state tracker manager.  It corresponds
 364  * to a "display" in the window system.
 365  */
 366 struct st_manager
 367 {
 368    struct pipe_screen *screen;
 369
 370    /**
 371     * Look up and return the info of an EGLImage.
 372     *
 373     * This is used to implement for example EGLImageTargetTexture2DOES.
 374     * The GLeglImageOES agrument of that call is passed directly to this
 375     * function call and the information needed to access this is returned
 376     * in the given struct out.
 377     *
 378     * @smapi: manager owning the caller context
 379     * @stctx: caller context
 380     * @egl_image: EGLImage that caller recived
 381     * @out: return struct filled out with access information.
 382     *
 383     * This function is optional.
 384     */
 385    boolean (*get_egl_image)(struct st_manager *smapi,
 386                             void *egl_image,
 387                             struct st_egl_image *out);
 388
 389    /**
 390     * Query an manager param.
 391     */
 392    int (*get_param)(struct st_manager *smapi,
 393                     enum st_manager_param param);
 394 };
 395
 396 /**
 397  * Represent a rendering API such as OpenGL or OpenVG.
 398  *
 399  * Implemented by the state tracker and used by the state tracker manager.
 400  */
 401 struct st_api
 402 {
 403    /**
 404     * The name of the rendering API.  This is informative.
 405     */
 406    const char *name;
 407
 408    /**
 409     * The supported rendering API.
 410     */
 411    enum st_api_type api;
 412
 413    /**
 414     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 415     */
 416    unsigned profile_mask;
 417
 418    /**
 419     * Destroy the API.
 420     */
 421    void (*destroy)(struct st_api *stapi);
 422
 423    /**
 424     * Return an API entry point.
 425     *
 426     * For GL this is the same as _glapi_get_proc_address.
 427     */
 428    st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
 429
 430    /**
 431     * Create a rendering context.
 432     */
 433    struct st_context_iface *(*create_context)(struct st_api *stapi,
 434                                               struct st_manager *smapi,
 435                                               const struct st_context_attribs *attribs,
 436                                               struct st_context_iface *stsharei);
 437
 438    /**
 439     * Bind the context to the calling thread with draw and read as drawables.
 440     *
 441     * The framebuffers might be NULL, or might have different visuals than the
 442     * context does.
 443     */
 444    boolean (*make_current)(struct st_api *stapi,
 445                            struct st_context_iface *stctxi,
 446                            struct st_framebuffer_iface *stdrawi,
 447                            struct st_framebuffer_iface *streadi);
 448
 449    /**
 450     * Get the currently bound context in the calling thread.
 451     */
 452    struct st_context_iface *(*get_current)(struct st_api *stapi);
 453 };
 454
 455 /**
 456  * Return true if the visual has the specified buffers.
 457  */
 458 static INLINE boolean
 459 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 460 {
 461    return ((visual->buffer_mask & mask) == mask);
 462 }
 463
 464 #endif /* _ST_API_H_ */