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 {
  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 }