src/mesa/state_tracker/st_cb_syncobj.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Marek Olšák <maraeo@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 Olšák <maraeo@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 }