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 };
  45
  46
  47 static struct gl_sync_object * st_new_sync_object(struct gl_context *ctx,
  48                                                   GLenum type)
  49 {
  50    if (type == GL_SYNC_FENCE)
  51       return (struct gl_sync_object*)CALLOC_STRUCT(st_sync_object);
  52    else
  53       return NULL;
  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    free(so->b.Label);
  64    free(so);
  65 }
  66
  67 static void st_fence_sync(struct gl_context *ctx, struct gl_sync_object *obj,
  68                           GLenum condition, GLbitfield flags)
  69 {
  70    struct pipe_context *pipe = st_context(ctx)->pipe;
  71    struct st_sync_object *so = (struct st_sync_object*)obj;
  72
  73    assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE && flags == 0);
  74    assert(so->fence == NULL);
  75
  76    pipe->flush(pipe, &so->fence, PIPE_FLUSH_DEFERRED);
  77 }
  78
  79 static void st_client_wait_sync(struct gl_context *ctx,
  80                                 struct gl_sync_object *obj,
  81                                 GLbitfield flags, GLuint64 timeout)
  82 {
  83    struct pipe_context *pipe = st_context(ctx)->pipe;
  84    struct pipe_screen *screen = pipe->screen;
  85    struct st_sync_object *so = (struct st_sync_object*)obj;
  86
  87    /* If the fence doesn't exist, assume it's signalled. */
  88    if (!so->fence) {
  89       so->b.StatusFlag = GL_TRUE;
  90       return;
  91    }
  92
  93    /* Section 4.1.2 of OpenGL 4.5 (Compatibility Profile) says:
  94     *    [...] if ClientWaitSync is called and all of the following are true:
  95     *    - the SYNC_FLUSH_COMMANDS_BIT bit is set in flags,
  96     *    - sync is unsignaled when ClientWaitSync is called,
  97     *    - and the calls to ClientWaitSync and FenceSync were issued from
  98     *      the same context,
  99     *    then the GL will behave as if the equivalent of Flush were inserted
 100     *    immediately after the creation of sync.
 101     *
 102     * Assume GL_SYNC_FLUSH_COMMANDS_BIT is always set, because applications
 103     * forget to set it.
 104     */
 105    if (screen->fence_finish(screen, pipe, so->fence, timeout)) {
 106       screen->fence_reference(screen, &so->fence, NULL);
 107       so->b.StatusFlag = GL_TRUE;
 108    }
 109 }
 110
 111 static void st_check_sync(struct gl_context *ctx, struct gl_sync_object *obj)
 112 {
 113    st_client_wait_sync(ctx, obj, 0, 0);
 114 }
 115
 116 static void st_server_wait_sync(struct gl_context *ctx,
 117                                 struct gl_sync_object *obj,
 118                                 GLbitfield flags, GLuint64 timeout)
 119 {
 120    /* NO-OP.
 121     * Neither Gallium nor DRM interfaces support blocking on the GPU. */
 122 }
 123
 124 void st_init_syncobj_functions(struct dd_function_table *functions)
 125 {
 126    functions->NewSyncObject = st_new_sync_object;
 127    functions->FenceSync = st_fence_sync;
 128    functions->DeleteSyncObject = st_delete_sync_object;
 129    functions->CheckSync = st_check_sync;
 130    functions->ClientWaitSync = st_client_wait_sync;
 131    functions->ServerWaitSync = st_server_wait_sync;
 132 }