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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 {
     50    struct st_sync_object *so = CALLOC_STRUCT(st_sync_object);
     51 
     52    mtx_init(&so->mutex, mtx_plain);
     53    return &so->b;
     54 }
     55 
     56 static void st_delete_sync_object(struct gl_context *ctx,
     57                                   struct gl_sync_object *obj)
     58 {
     59    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
     60    struct st_sync_object *so = (struct st_sync_object*)obj;
     61 
     62    screen->fence_reference(screen, &so->fence, NULL);
     63    mtx_destroy(&so->mutex);
     64    free(so->b.Label);
     65    free(so);
     66 }
     67 
     68 static void st_fence_sync(struct gl_context *ctx, struct gl_sync_object *obj,
     69                           GLenum condition, GLbitfield flags)
     70 {
     71    struct pipe_context *pipe = st_context(ctx)->pipe;
     72    struct st_sync_object *so = (struct st_sync_object*)obj;
     73 
     74    assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE && flags == 0);
     75    assert(so->fence == NULL);
     76 
     77    pipe->flush(pipe, &so->fence, PIPE_FLUSH_DEFERRED);
     78 }
     79 
     80 static void st_client_wait_sync(struct gl_context *ctx,
     81                                 struct gl_sync_object *obj,
     82                                 GLbitfield flags, GLuint64 timeout)
     83 {
     84    struct pipe_context *pipe = st_context(ctx)->pipe;
     85    struct pipe_screen *screen = pipe->screen;
     86    struct st_sync_object *so = (struct st_sync_object*)obj;
     87    struct pipe_fence_handle *fence = NULL;
     88 
     89    /* If the fence doesn't exist, assume it's signalled. */
     90    mtx_lock(&so->mutex);
     91    if (!so->fence) {
     92       mtx_unlock(&so->mutex);
     93       so->b.StatusFlag = GL_TRUE;
     94       return;
     95    }
     96 
     97    /* We need a local copy of the fence pointer, so that we can call
     98     * fence_finish unlocked.
     99     */
    100    screen->fence_reference(screen, &fence, so->fence);
    101    mtx_unlock(&so->mutex);
    102 
    103    /* Section 4.1.2 of OpenGL 4.5 (Compatibility Profile) says:
    104     *    [...] if ClientWaitSync is called and all of the following are true:
    105     *    - the SYNC_FLUSH_COMMANDS_BIT bit is set in flags,
    106     *    - sync is unsignaled when ClientWaitSync is called,
    107     *    - and the calls to ClientWaitSync and FenceSync were issued from
    108     *      the same context,
    109     *    then the GL will behave as if the equivalent of Flush were inserted
    110     *    immediately after the creation of sync.
    111     *
    112     * Assume GL_SYNC_FLUSH_COMMANDS_BIT is always set, because applications
    113     * forget to set it.
    114     */
    115    if (screen->fence_finish(screen, pipe, fence, timeout)) {
    116       mtx_lock(&so->mutex);
    117       screen->fence_reference(screen, &so->fence, NULL);
    118       mtx_unlock(&so->mutex);
    119       so->b.StatusFlag = GL_TRUE;
    120    }
    121    screen->fence_reference(screen, &fence, NULL);
    122 }
    123 
    124 static void st_check_sync(struct gl_context *ctx, struct gl_sync_object *obj)
    125 {
    126    st_client_wait_sync(ctx, obj, 0, 0);
    127 }
    128 
    129 static void st_server_wait_sync(struct gl_context *ctx,
    130                                 struct gl_sync_object *obj,
    131                                 GLbitfield flags, GLuint64 timeout)
    132 {
    133    struct pipe_context *pipe = st_context(ctx)->pipe;
    134    struct pipe_screen *screen = pipe->screen;
    135    struct st_sync_object *so = (struct st_sync_object*)obj;
    136    struct pipe_fence_handle *fence = NULL;
    137 
    138    /* Nothing needs to be done here if the driver does not support async
    139     * flushes. */
    140    if (!pipe->fence_server_sync)
    141       return;
    142 
    143    /* If the fence doesn't exist, assume it's signalled. */
    144    mtx_lock(&so->mutex);
    145    if (!so->fence) {
    146       mtx_unlock(&so->mutex);
    147       so->b.StatusFlag = GL_TRUE;
    148       return;
    149    }
    150 
    151    /* We need a local copy of the fence pointer. */
    152    screen->fence_reference(screen, &fence, so->fence);
    153    mtx_unlock(&so->mutex);
    154 
    155    pipe->fence_server_sync(pipe, fence);
    156    screen->fence_reference(screen, &fence, NULL);
    157 }
    158 
    159 void st_init_syncobj_functions(struct dd_function_table *functions)
    160 {
    161    functions->NewSyncObject = st_new_sync_object;
    162    functions->FenceSync = st_fence_sync;
    163    functions->DeleteSyncObject = st_delete_sync_object;
    164    functions->CheckSync = st_check_sync;
    165    functions->ClientWaitSync = st_client_wait_sync;
    166    functions->ServerWaitSync = st_server_wait_sync;
    167 }
    168