src/gallium/include/state_tracker/st_api.h

   1 /**********************************************************
   2  * Copyright 2010 VMware, Inc.  All rights reserved.
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   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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  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  * Used in st_context_iface->teximage.
  74  */
  75 enum st_texture_type {
  76    ST_TEXTURE_1D,
  77    ST_TEXTURE_2D,
  78    ST_TEXTURE_3D,
  79    ST_TEXTURE_RECT
  80 };
  81
  82 /**
  83  * Available attachments of framebuffer.
  84  */
  85 enum st_attachment_type {
  86    ST_ATTACHMENT_FRONT_LEFT,
  87    ST_ATTACHMENT_BACK_LEFT,
  88    ST_ATTACHMENT_FRONT_RIGHT,
  89    ST_ATTACHMENT_BACK_RIGHT,
  90    ST_ATTACHMENT_DEPTH_STENCIL,
  91    ST_ATTACHMENT_ACCUM,
  92    ST_ATTACHMENT_SAMPLE,
  93
  94    ST_ATTACHMENT_COUNT,
  95    ST_ATTACHMENT_INVALID = -1
  96 };
  97
  98 /* for buffer_mask in st_visual */
  99 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
 100 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
 101 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
 102 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
 103 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
 104 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
 105 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
 106
 107 /**
 108  * Enumerations of state tracker context resources.
 109  */
 110 enum st_context_resource_type {
 111    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
 112    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
 113    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
 114    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 115    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 116    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 117    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 118    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 119    ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
 120    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
 121 };
 122
 123 /**
 124  * Value to st_manager->get_param function.
 125  */
 126 enum st_manager_param {
 127    /**
 128     * The dri state tracker on old libGL's doesn't do the right thing
 129     * with regards to invalidating the framebuffers.
 130     *
 131     * For the mesa state tracker that means that it needs to invalidate
 132     * the framebuffer in glViewport itself.
 133     */
 134    ST_MANAGER_BROKEN_INVALIDATE
 135 };
 136
 137 /**
 138  * The return type of st_api->get_proc_address.
 139  */
 140 typedef void (*st_proc_t)(void);
 141
 142 struct pipe_context;
 143 struct pipe_resource;
 144 struct pipe_fence_handle;
 145
 146 /**
 147  * Used in st_context_iface->get_resource_for_egl_image.
 148  */
 149 struct st_context_resource
 150 {
 151    /* these fields are filled by the caller */
 152    enum st_context_resource_type type;
 153    void *resource;
 154
 155    /* this is owned by the caller */
 156    struct pipe_resource *texture;
 157 };
 158
 159 /**
 160  * Used in st_manager_iface->get_egl_image.
 161  */
 162 struct st_egl_image
 163 {
 164    /* this is owned by the caller */
 165    struct pipe_resource *texture;
 166
 167    unsigned level;
 168    unsigned layer;
 169 };
 170
 171 /**
 172  * Represent the visual of a framebuffer.
 173  */
 174 struct st_visual
 175 {
 176    /**
 177     * Available buffers.  Tested with ST_FRAMEBUFFER_*_MASK.
 178     */
 179    unsigned buffer_mask;
 180
 181    /**
 182     * Buffer formats.  The formats are always set even when the buffer is
 183     * not available.
 184     */
 185    enum pipe_format color_format;
 186    enum pipe_format depth_stencil_format;
 187    enum pipe_format accum_format;
 188    int samples;
 189
 190    /**
 191     * Desired render buffer.
 192     */
 193    enum st_attachment_type render_buffer;
 194 };
 195
 196 /**
 197  * Represent the attributes of a context.
 198  */
 199 struct st_context_attribs
 200 {
 201    /**
 202     * The profile and minimal version to support.
 203     *
 204     * The valid profiles and versions are rendering API dependent.  The latest
 205     * version satisfying the request should be returned, unless
 206     * forward_compatiible is true.
 207     */
 208    enum st_profile_type profile;
 209    int major, minor;
 210
 211    /**
 212     * Enable debugging.
 213     */
 214    boolean debug;
 215
 216    /**
 217     * Return the exact version and disallow the use of deprecated features.
 218     */
 219    boolean forward_compatible;
 220
 221    /**
 222     * The visual of the framebuffers the context will be bound to.
 223     */
 224    struct st_visual visual;
 225 };
 226
 227 /**
 228  * Represent a windowing system drawable.
 229  *
 230  * The framebuffer is implemented by the state tracker manager and
 231  * used by the state trackers.
 232  *
 233  * Instead of the winsys pokeing into the API context to figure
 234  * out what buffers that might be needed in the future by the API
 235  * context, it calls into the framebuffer to get the textures.
 236  *
 237  * This structure along with the notify_invalid_framebuffer
 238  * allows framebuffers to be shared between different threads
 239  * but at the same make the API context free from thread
 240  * syncronisation primitves, with the exception of a small
 241  * atomic flag used for notification of framebuffer dirty status.
 242  *
 243  * The thread syncronisation is put inside the framebuffer
 244  * and only called once the framebuffer has become dirty.
 245  */
 246 struct st_framebuffer_iface
 247 {
 248    /**
 249     * Available for the state tracker manager to use.
 250     */
 251    void *st_manager_private;
 252
 253    /**
 254     * The visual of a framebuffer.
 255     */
 256    const struct st_visual *visual;
 257
 258    /**
 259     * Flush the front buffer.
 260     *
 261     * On some window systems, changes to the front buffers are not immediately
 262     * visible.  They need to be flushed.
 263     *
 264     * @att is one of the front buffer attachments.
 265     */
 266    boolean (*flush_front)(struct st_framebuffer_iface *stfbi,
 267                           enum st_attachment_type statt);
 268
 269    /**
 270     * The state tracker asks for the textures it needs.
 271     *
 272     * It should try to only ask for attachments that it currently renders
 273     * to, thus allowing the winsys to delay the allocation of textures not
 274     * needed. For example front buffer attachments are not needed if you
 275     * only do back buffer rendering.
 276     *
 277     * The implementor of this function needs to also ensure
 278     * thread safty as this call might be done from multiple threads.
 279     *
 280     * The returned textures are owned by the caller.  They should be
 281     * unreferenced when no longer used.  If this function is called multiple
 282     * times with different sets of attachments, those buffers not included in
 283     * the last call might be destroyed.  This behavior might change in the
 284     * future.
 285     */
 286    boolean (*validate)(struct st_framebuffer_iface *stfbi,
 287                        const enum st_attachment_type *statts,
 288                        unsigned count,
 289                        struct pipe_resource **out);
 290 };
 291
 292 /**
 293  * Represent a rendering context.
 294  *
 295  * This entity is created from st_api and used by the state tracker manager.
 296  */
 297 struct st_context_iface
 298 {
 299    /**
 300     * Available for the state tracker and the manager to use.
 301     */
 302    void *st_context_private;
 303    void *st_manager_private;
 304
 305    /**
 306     * Destroy the context.
 307     */
 308    void (*destroy)(struct st_context_iface *stctxi);
 309
 310    /**
 311     * Invalidate the current textures that was taken from a framebuffer.
 312     *
 313     * The state tracker manager calls this function to let the rendering
 314     * context know that it should update the textures it got from
 315     * st_framebuffer_iface::validate.  It should do so at the latest time possible.
 316     * Possible right before sending triangles to the pipe context.
 317     *
 318     * For certain platforms this function might be called from a thread other
 319     * than the thread that the context is currently bound in, and must
 320     * therefore be thread safe. But it is the state tracker manager's
 321     * responsibility to make sure that the framebuffer is bound to the context
 322     * and the API context is current for the duration of this call.
 323     *
 324     * Thus reducing the sync primitive needed to a single atomic flag.
 325     */
 326    void (*notify_invalid_framebuffer)(struct st_context_iface *stctxi,
 327                                       struct st_framebuffer_iface *stfbi);
 328
 329    /**
 330     * Flush all drawing from context to the pipe also flushes the pipe.
 331     */
 332    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 333                  struct pipe_fence_handle **fence);
 334
 335    /**
 336     * Replace the texture image of a texture object at the specified level.
 337     *
 338     * This function is optional.
 339     */
 340    boolean (*teximage)(struct st_context_iface *stctxi, enum st_texture_type target,
 341                        int level, enum pipe_format internal_format,
 342                        struct pipe_resource *tex, boolean mipmap);
 343
 344    /**
 345     * Used to implement glXCopyContext.
 346     */
 347    void (*copy)(struct st_context_iface *stctxi,
 348                 struct st_context_iface *stsrci, unsigned mask);
 349
 350    /**
 351     * Used to implement wglShareLists.
 352     */
 353    boolean (*share)(struct st_context_iface *stctxi,
 354                     struct st_context_iface *stsrci);
 355
 356    /**
 357     * Look up and return the info of a resource for EGLImage.
 358     *
 359     * This function is optional.
 360     */
 361    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 362                                          struct st_context_resource *stres);
 363 };
 364
 365
 366 /**
 367  * Represent a state tracker manager.
 368  *
 369  * This interface is implemented by the state tracker manager.  It corresponds
 370  * to a "display" in the window system.
 371  */
 372 struct st_manager
 373 {
 374    struct pipe_screen *screen;
 375
 376    /**
 377     * Look up and return the info of an EGLImage.
 378     *
 379     * This is used to implement for example EGLImageTargetTexture2DOES.
 380     * The GLeglImageOES agrument of that call is passed directly to this
 381     * function call and the information needed to access this is returned
 382     * in the given struct out.
 383     *
 384     * @smapi: manager owning the caller context
 385     * @stctx: caller context
 386     * @egl_image: EGLImage that caller recived
 387     * @out: return struct filled out with access information.
 388     *
 389     * This function is optional.
 390     */
 391    boolean (*get_egl_image)(struct st_manager *smapi,
 392                             void *egl_image,
 393                             struct st_egl_image *out);
 394
 395    /**
 396     * Query an manager param.
 397     */
 398    int (*get_param)(struct st_manager *smapi,
 399                     enum st_manager_param param);
 400 };
 401
 402 /**
 403  * Represent a rendering API such as OpenGL or OpenVG.
 404  *
 405  * Implemented by the state tracker and used by the state tracker manager.
 406  */
 407 struct st_api
 408 {
 409    /**
 410     * The name of the rendering API.  This is informative.
 411     */
 412    const char *name;
 413
 414    /**
 415     * The supported rendering API.
 416     */
 417    enum st_api_type api;
 418
 419    /**
 420     * The supported profiles.  Tested with ST_PROFILE_*_MASK.
 421     */
 422    unsigned profile_mask;
 423
 424    /**
 425     * Destroy the API.
 426     */
 427    void (*destroy)(struct st_api *stapi);
 428
 429    /**
 430     * Return an API entry point.
 431     *
 432     * For GL this is the same as _glapi_get_proc_address.
 433     */
 434    st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
 435
 436    /**
 437     * Create a rendering context.
 438     */
 439    struct st_context_iface *(*create_context)(struct st_api *stapi,
 440                                               struct st_manager *smapi,
 441                                               const struct st_context_attribs *attribs,
 442                                               struct st_context_iface *stsharei);
 443
 444    /**
 445     * Bind the context to the calling thread with draw and read as drawables.
 446     *
 447     * The framebuffers might be NULL, or might have different visuals than the
 448     * context does.
 449     */
 450    boolean (*make_current)(struct st_api *stapi,
 451                            struct st_context_iface *stctxi,
 452                            struct st_framebuffer_iface *stdrawi,
 453                            struct st_framebuffer_iface *streadi);
 454
 455    /**
 456     * Get the currently bound context in the calling thread.
 457     */
 458    struct st_context_iface *(*get_current)(struct st_api *stapi);
 459 };
 460
 461 /**
 462  * Return true if the visual has the specified buffers.
 463  */
 464 static INLINE boolean
 465 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 466 {
 467    return ((visual->buffer_mask & mask) == mask);
 468 }
 469
 470 #endif /* _ST_API_H_ */