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
   6  * files (the "Software"), to deal in the Software without
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   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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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 entry points of the state trackers.
  47  */
  48 #define ST_MODULE_OPENGL_SYMBOL      "st_module_OpenGL"
  49 #define ST_MODULE_OPENGL_ES1_SYMBOL  "st_module_OpenGL_ES1"
  50 #define ST_MODULE_OPENGL_ES2_SYMBOL  "st_module_OpenGL_ES2"
  51 #define ST_MODULE_OPENVG_SYMBOL      "st_module_OpenVG"
  52
  53 /**
  54  * The supported rendering API of a state tracker.
  55  */
  56 enum st_api_type {
  57    ST_API_OPENGL,
  58    ST_API_OPENGL_ES1,
  59    ST_API_OPENGL_ES2,
  60    ST_API_OPENVG,
  61
  62    ST_API_COUNT
  63 };
  64
  65 /**
  66  * Used in st_context_iface->teximage.
  67  */
  68 enum st_texture_type {
  69    ST_TEXTURE_1D,
  70    ST_TEXTURE_2D,
  71    ST_TEXTURE_3D,
  72    ST_TEXTURE_RECT,
  73 };
  74
  75 /**
  76  * Available attachments of framebuffer.
  77  */
  78 enum st_attachment_type {
  79    ST_ATTACHMENT_FRONT_LEFT,
  80    ST_ATTACHMENT_BACK_LEFT,
  81    ST_ATTACHMENT_FRONT_RIGHT,
  82    ST_ATTACHMENT_BACK_RIGHT,
  83    ST_ATTACHMENT_DEPTH_STENCIL,
  84    ST_ATTACHMENT_ACCUM,
  85    ST_ATTACHMENT_SAMPLE,
  86
  87    ST_ATTACHMENT_COUNT,
  88    ST_ATTACHMENT_INVALID = -1
  89 };
  90
  91 /* for buffer_mask in st_visual */
  92 #define ST_ATTACHMENT_FRONT_LEFT_MASK     (1 << ST_ATTACHMENT_FRONT_LEFT)
  93 #define ST_ATTACHMENT_BACK_LEFT_MASK      (1 << ST_ATTACHMENT_BACK_LEFT)
  94 #define ST_ATTACHMENT_FRONT_RIGHT_MASK    (1 << ST_ATTACHMENT_FRONT_RIGHT)
  95 #define ST_ATTACHMENT_BACK_RIGHT_MASK     (1 << ST_ATTACHMENT_BACK_RIGHT)
  96 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK  (1 << ST_ATTACHMENT_DEPTH_STENCIL)
  97 #define ST_ATTACHMENT_ACCUM_MASK          (1 << ST_ATTACHMENT_ACCUM)
  98 #define ST_ATTACHMENT_SAMPLE_MASK         (1 << ST_ATTACHMENT_SAMPLE)
  99
 100 /**
 101  * Enumerations of state tracker context resources.
 102  */
 103 enum st_context_resource_type {
 104    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
 105    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
 106    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
 107    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
 108    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 109    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
 110    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
 111    ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
 112    ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
 113    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE,
 114 };
 115
 116 /**
 117  * The return type of st_api->get_proc_address.
 118  */
 119 typedef void (*st_proc_t)(void);
 120
 121 struct pipe_context;
 122 struct pipe_texture;
 123 struct pipe_fence_handle;
 124
 125 /**
 126  * Used in st_context_iface->get_resource_for_egl_image.
 127  */
 128 struct st_context_resource
 129 {
 130    /* these fields are filled by the caller */
 131    enum st_context_resource_type type;
 132    void *resource;
 133
 134    /* this is owned by the caller */
 135    struct pipe_texture *texture;
 136 };
 137
 138 /**
 139  * Used in st_manager_iface->get_egl_image.
 140  */
 141 struct st_egl_image
 142 {
 143    /* these fields are filled by the caller */
 144    struct st_context_iface *stctxi;
 145    void *egl_image;
 146
 147    /* this is owned by the caller */
 148    struct pipe_texture *texture;
 149
 150    unsigned face;
 151    unsigned level;
 152    unsigned zslice;
 153 };
 154
 155 /**
 156  * Represent the visual of a framebuffer.
 157  */
 158 struct st_visual
 159 {
 160    /**
 161     * Available buffers.  Tested with ST_FRAMEBUFFER_*_MASK.
 162     */
 163    unsigned buffer_mask;
 164
 165    /**
 166     * Buffer formats.  The formats are always set even when the buffer is
 167     * not available.
 168     */
 169    enum pipe_format color_format;
 170    enum pipe_format depth_stencil_format;
 171    enum pipe_format accum_format;
 172    int samples;
 173
 174    /**
 175     * Desired render buffer.
 176     */
 177    enum st_attachment_type render_buffer;
 178 };
 179
 180 /**
 181  * Represent a windowing system drawable.
 182  *
 183  * The framebuffer is implemented by the state tracker manager and
 184  * used by the state trackers.
 185  *
 186  * Instead of the winsys pokeing into the API context to figure
 187  * out what buffers that might be needed in the future by the API
 188  * context, it calls into the framebuffer to get the textures.
 189  *
 190  * This structure along with the notify_invalid_framebuffer
 191  * allows framebuffers to be shared between different threads
 192  * but at the same make the API context free from thread
 193  * syncronisation primitves, with the exception of a small
 194  * atomic flag used for notification of framebuffer dirty status.
 195  *
 196  * The thread syncronisation is put inside the framebuffer
 197  * and only called once the framebuffer has become dirty.
 198  */
 199 struct st_framebuffer_iface
 200 {
 201    /**
 202     * Available for the state tracker manager to use.
 203     */
 204    void *st_manager_private;
 205
 206    /**
 207     * The visual of a framebuffer.
 208     */
 209    const struct st_visual *visual;
 210
 211    /**
 212     * Flush the front buffer.
 213     *
 214     * On some window systems, changes to the front buffers are not immediately
 215     * visible.  They need to be flushed.
 216     *
 217     * @att is one of the front buffer attachments.
 218     */
 219    boolean (*flush_front)(struct st_framebuffer_iface *stfbi,
 220                           enum st_attachment_type statt);
 221
 222    /**
 223     * The state tracker asks for the textures it needs.
 224     *
 225     * It should try to only ask for attachments that it currently renders
 226     * to, thus allowing the winsys to delay the allocation of textures not
 227     * needed. For example front buffer attachments are not needed if you
 228     * only do back buffer rendering.
 229     *
 230     * The implementor of this function needs to also ensure
 231     * thread safty as this call might be done from multiple threads.
 232     *
 233     * The returned textures are owned by the caller.  They should be
 234     * unreferenced when no longer used.  If this function is called multiple
 235     * times with different sets of attachments, those buffers not included in
 236     * the last call might be destroyed.  This behavior might change in the
 237     * future.
 238     */
 239    boolean (*validate)(struct st_framebuffer_iface *stfbi,
 240                        const enum st_attachment_type *statts,
 241                        unsigned count,
 242                        struct pipe_texture **out);
 243 };
 244
 245 /**
 246  * Represent a rendering context.
 247  *
 248  * This entity is created from st_api and used by the state tracker manager.
 249  */
 250 struct st_context_iface
 251 {
 252    /**
 253     * Available for the state tracker and the manager to use.
 254     */
 255    void *st_context_private;
 256    void *st_manager_private;
 257
 258    /**
 259     * Destroy the context.
 260     */
 261    void (*destroy)(struct st_context_iface *stctxi);
 262
 263    /**
 264     * Invalidate the current textures that was taken from a framebuffer.
 265     *
 266     * The state tracker manager calls this function to let the rendering
 267     * context know that it should update the textures it got from
 268     * st_framebuffer_iface::validate.  It should do so at the latest time possible.
 269     * Possible right before sending triangles to the pipe context.
 270     *
 271     * For certain platforms this function might be called from a thread other
 272     * than the thread that the context is currently bound in, and must
 273     * therefore be thread safe. But it is the state tracker manager's
 274     * responsibility to make sure that the framebuffer is bound to the context
 275     * and the API context is current for the duration of this call.
 276     *
 277     * Thus reducing the sync primitive needed to a single atomic flag.
 278     */
 279    void (*notify_invalid_framebuffer)(struct st_context_iface *stctxi,
 280                                       struct st_framebuffer_iface *stfbi);
 281
 282    /**
 283     * Flush all drawing from context to the pipe also flushes the pipe.
 284     */
 285    void (*flush)(struct st_context_iface *stctxi, unsigned flags,
 286                  struct pipe_fence_handle **fence);
 287
 288    /**
 289     * Replace the texture image of a texture object at the specified level.
 290     *
 291     * This function is optional.
 292     */
 293    boolean (*teximage)(struct st_context_iface *stctxi, enum st_texture_type target,
 294                        int level, enum pipe_format internal_format,
 295                        struct pipe_texture *tex, boolean mipmap);
 296
 297    /**
 298     * Used to implement glXCopyContext.
 299     */
 300    void (*copy)(struct st_context_iface *stctxi,
 301                 struct st_context_iface *stsrci, unsigned mask);
 302
 303    /**
 304     * Look up and return the info of a resource for EGLImage.
 305     *
 306     * This function is optional.
 307     */
 308    boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
 309                                          struct st_context_resource *stres);
 310 };
 311
 312
 313 /**
 314  * Represent a state tracker manager.
 315  *
 316  * This interface is implemented by the state tracker manager.  It corresponds
 317  * to a "display" in the window system.
 318  */
 319 struct st_manager
 320 {
 321    struct pipe_screen *screen;
 322
 323    /**
 324     * Look up and return the info of an EGLImage.
 325     *
 326     * This function is optional.
 327     */
 328    boolean (*get_egl_image)(struct st_manager *smapi,
 329                             struct st_egl_image *stimg);
 330 };
 331
 332 /**
 333  * Represent a rendering API such as OpenGL or OpenVG.
 334  *
 335  * Implemented by the state tracker and used by the state tracker manager.
 336  */
 337 struct st_api
 338 {
 339    /**
 340     * Destroy the API.
 341     */
 342    void (*destroy)(struct st_api *stapi);
 343
 344    /**
 345     * Return an API entry point.
 346     *
 347     * For GL this is the same as _glapi_get_proc_address.
 348     */
 349    st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
 350
 351    /**
 352     * Return true if the visual is supported by the state tracker.
 353     */
 354    boolean (*is_visual_supported)(struct st_api *stapi,
 355                                   const struct st_visual *visual);
 356
 357    /**
 358     * Create a rendering context.
 359     */
 360    struct st_context_iface *(*create_context)(struct st_api *stapi,
 361                                               struct st_manager *smapi,
 362                                               const struct st_visual *visual,
 363                                               struct st_context_iface *stsharei);
 364
 365    /**
 366     * Bind the context to the calling thread with draw and read as drawables.
 367     *
 368     * The framebuffers might have different visuals than the context does.
 369     */
 370    boolean (*make_current)(struct st_api *stapi,
 371                            struct st_context_iface *stctxi,
 372                            struct st_framebuffer_iface *stdrawi,
 373                            struct st_framebuffer_iface *streadi);
 374
 375    /**
 376     * Get the currently bound context in the calling thread.
 377     */
 378    struct st_context_iface *(*get_current)(struct st_api *stapi);
 379 };
 380
 381 /**
 382  * Represent a state tracker.
 383  *
 384  * This is the entry point of a state tracker.
 385  */
 386 struct st_module
 387 {
 388    enum st_api_type api;
 389    struct st_api *(*create_api)(void);
 390 };
 391
 392 /**
 393  * Return true if the visual has the specified buffers.
 394  */
 395 static INLINE boolean
 396 st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
 397 {
 398    return ((visual->buffer_mask & mask) == mask);
 399 }
 400
 401 /* these symbols may need to be dynamically lookup up */
 402 extern PUBLIC const struct st_module st_module_OpenGL;
 403 extern PUBLIC const struct st_module st_module_OpenGL_ES1;
 404 extern PUBLIC const struct st_module st_module_OpenGL_ES2;
 405 extern PUBLIC const struct st_module st_module_OpenVG;
 406
 407 #endif /* _ST_API_H_ */