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      1 /**************************************************************************
      2  *
      3  * Copyright 2011 Marek Olk <maraeo (at) gmail.com>
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28  /*
     29   * Authors:
     30   *   Marek Olk <maraeo (at) gmail.com>
     31   */
     32 
     33 #include "main/glheader.h"
     34 #include "main/macros.h"
     35 #include "pipe/p_context.h"
     36 #include "pipe/p_screen.h"
     37 #include "st_context.h"
     38 #include "st_cb_syncobj.h"
     39 
     40 struct st_sync_object {
     41    struct gl_sync_object b;
     42 
     43    struct pipe_fence_handle *fence;
     44    mtx_t mutex; /**< protects "fence" */
     45 };
     46 
     47 
     48 static struct gl_sync_object * st_new_sync_object(struct gl_context *ctx,
     49                                                   GLenum type)
     50 {
     51    if (type == GL_SYNC_FENCE) {
     52       struct st_sync_object *so = CALLOC_STRUCT(st_sync_object);
     53 
     54       mtx_init(&so->mutex, mtx_plain);
     55       return &so->b;
     56    } else {
     57       return NULL;
     58    }
     59 }
     60 
     61 static void st_delete_sync_object(struct gl_context *ctx,
     62                                   struct gl_sync_object *obj)
     63 {
     64    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
     65    struct st_sync_object *so = (struct st_sync_object*)obj;
     66 
     67    screen->fence_reference(screen, &so->fence, NULL);
     68    mtx_destroy(&so->mutex);
     69    free(so->b.Label);
     70    free(so);
     71 }
     72 
     73 static void st_fence_sync(struct gl_context *ctx, struct gl_sync_object *obj,
     74                           GLenum condition, GLbitfield flags)
     75 {
     76    struct pipe_context *pipe = st_context(ctx)->pipe;
     77    struct st_sync_object *so = (struct st_sync_object*)obj;
     78 
     79    assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE && flags == 0);
     80    assert(so->fence == NULL);
     81 
     82    pipe->flush(pipe, &so->fence, PIPE_FLUSH_DEFERRED);
     83 }
     84 
     85 static void st_client_wait_sync(struct gl_context *ctx,
     86                                 struct gl_sync_object *obj,
     87                                 GLbitfield flags, GLuint64 timeout)
     88 {
     89    struct pipe_context *pipe = st_context(ctx)->pipe;
     90    struct pipe_screen *screen = pipe->screen;
     91    struct st_sync_object *so = (struct st_sync_object*)obj;
     92    struct pipe_fence_handle *fence = NULL;
     93 
     94    /* If the fence doesn't exist, assume it's signalled. */
     95    mtx_lock(&so->mutex);
     96    if (!so->fence) {
     97       mtx_unlock(&so->mutex);
     98       so->b.StatusFlag = GL_TRUE;
     99       return;
    100    }
    101 
    102    /* We need a local copy of the fence pointer, so that we can call
    103     * fence_finish unlocked.
    104     */
    105    screen->fence_reference(screen, &fence, so->fence);
    106    mtx_unlock(&so->mutex);
    107 
    108    /* Section 4.1.2 of OpenGL 4.5 (Compatibility Profile) says:
    109     *    [...] if ClientWaitSync is called and all of the following are true:
    110     *    - the SYNC_FLUSH_COMMANDS_BIT bit is set in flags,
    111     *    - sync is unsignaled when ClientWaitSync is called,
    112     *    - and the calls to ClientWaitSync and FenceSync were issued from
    113     *      the same context,
    114     *    then the GL will behave as if the equivalent of Flush were inserted
    115     *    immediately after the creation of sync.
    116     *
    117     * Assume GL_SYNC_FLUSH_COMMANDS_BIT is always set, because applications
    118     * forget to set it.
    119     */
    120    if (screen->fence_finish(screen, pipe, fence, timeout)) {
    121       mtx_lock(&so->mutex);
    122       screen->fence_reference(screen, &so->fence, NULL);
    123       mtx_unlock(&so->mutex);
    124       so->b.StatusFlag = GL_TRUE;
    125    }
    126    screen->fence_reference(screen, &fence, NULL);
    127 }
    128 
    129 static void st_check_sync(struct gl_context *ctx, struct gl_sync_object *obj)
    130 {
    131    st_client_wait_sync(ctx, obj, 0, 0);
    132 }
    133 
    134 static void st_server_wait_sync(struct gl_context *ctx,
    135                                 struct gl_sync_object *obj,
    136                                 GLbitfield flags, GLuint64 timeout)
    137 {
    138    /* NO-OP.
    139     * Neither Gallium nor DRM interfaces support blocking on the GPU. */
    140 }
    141 
    142 void st_init_syncobj_functions(struct dd_function_table *functions)
    143 {
    144    functions->NewSyncObject = st_new_sync_object;
    145    functions->FenceSync = st_fence_sync;
    146    functions->DeleteSyncObject = st_delete_sync_object;
    147    functions->CheckSync = st_check_sync;
    148    functions->ClientWaitSync = st_client_wait_sync;
    149    functions->ServerWaitSync = st_server_wait_sync;
    150 }
    151