• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * Copyright © 2016 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21  * DEALINGS IN THE SOFTWARE.
22  */
23 
24 #include <stdbool.h>
25 #include "context.h"
26 #include "debug_output.h"
27 #include "get.h"
28 #include "mtypes.h"
29 #include "macros.h"
30 #include "main/dispatch.h" /* for _gloffset_COUNT */
31 
32 static void GLAPIENTRY
_context_lost_GetSynciv(GLsync sync,GLenum pname,GLsizei bufSize,GLsizei * length,GLint * values)33 _context_lost_GetSynciv(GLsync sync, GLenum pname, GLsizei bufSize,
34                         GLsizei *length, GLint *values)
35 {
36    GET_CURRENT_CONTEXT(ctx);
37    if (ctx)
38       _mesa_error(ctx, GL_CONTEXT_LOST, "GetSynciv(invalid call)");
39 
40    if (pname == GL_SYNC_STATUS && bufSize >= 1)
41       *values = GL_SIGNALED;
42 }
43 
44 static void GLAPIENTRY
_context_lost_GetQueryObjectuiv(GLuint id,GLenum pname,GLuint * params)45 _context_lost_GetQueryObjectuiv(GLuint id, GLenum pname, GLuint *params)
46 {
47    GET_CURRENT_CONTEXT(ctx);
48    if (ctx)
49       _mesa_error(ctx, GL_CONTEXT_LOST, "GetQueryObjectuiv(context lost)");
50 
51    if (pname == GL_QUERY_RESULT_AVAILABLE)
52       *params = GL_TRUE;
53 }
54 
55 static int
context_lost_nop_handler(void)56 context_lost_nop_handler(void)
57 {
58    GET_CURRENT_CONTEXT(ctx);
59    if (ctx)
60       _mesa_error(ctx, GL_CONTEXT_LOST, "context lost");
61 
62    return 0;
63 }
64 
65 void
_mesa_set_context_lost_dispatch(struct gl_context * ctx)66 _mesa_set_context_lost_dispatch(struct gl_context *ctx)
67 {
68    if (ctx->ContextLost == NULL) {
69       int numEntries = MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT);
70 
71       ctx->ContextLost = malloc(numEntries * sizeof(_glapi_proc));
72       if (!ctx->ContextLost)
73          return;
74 
75       _glapi_proc *entry = (_glapi_proc *) ctx->ContextLost;
76       unsigned i;
77       for (i = 0; i < numEntries; i++)
78          entry[i] = (_glapi_proc) context_lost_nop_handler;
79 
80       /* The ARB_robustness specification says:
81        *
82        *    "* GetError and GetGraphicsResetStatus behave normally following a
83        *       graphics reset, so that the application can determine a reset
84        *       has occurred, and when it is safe to destroy and recreate the
85        *       context.
86        *
87        *     * Any commands which might cause a polling application to block
88        *       indefinitely will generate a CONTEXT_LOST error, but will also
89        *       return a value indicating completion to the application. Such
90        *       commands include:
91        *
92        *        + GetSynciv with <pname> SYNC_STATUS ignores the other
93        *          parameters and returns SIGNALED in <values>.
94        *
95        *        + GetQueryObjectuiv with <pname> QUERY_RESULT_AVAILABLE
96        *          ignores the other parameters and returns TRUE in <params>."
97        */
98       SET_GetError(ctx->ContextLost, _mesa_GetError);
99       SET_GetGraphicsResetStatusARB(ctx->ContextLost, _mesa_GetGraphicsResetStatusARB);
100       SET_GetSynciv(ctx->ContextLost, _context_lost_GetSynciv);
101       SET_GetQueryObjectuiv(ctx->ContextLost, _context_lost_GetQueryObjectuiv);
102    }
103 
104    ctx->CurrentServerDispatch = ctx->ContextLost;
105    _glapi_set_dispatch(ctx->CurrentServerDispatch);
106 }
107 
108 /**
109  * Returns an error code specified by GL_ARB_robustness, or GL_NO_ERROR.
110  * \return current context status
111  */
112 GLenum GLAPIENTRY
_mesa_GetGraphicsResetStatusARB(void)113 _mesa_GetGraphicsResetStatusARB( void )
114 {
115    GET_CURRENT_CONTEXT(ctx);
116    GLenum status = GL_NO_ERROR;
117 
118    /* The ARB_robustness specification says:
119     *
120     *     "If the reset notification behavior is NO_RESET_NOTIFICATION_ARB,
121     *     then the implementation will never deliver notification of reset
122     *     events, and GetGraphicsResetStatusARB will always return NO_ERROR."
123     */
124    if (ctx->Const.ResetStrategy == GL_NO_RESET_NOTIFICATION_ARB) {
125       if (MESA_VERBOSE & VERBOSE_API)
126          _mesa_debug(ctx,
127                      "glGetGraphicsResetStatusARB always returns GL_NO_ERROR "
128                      "because reset notifictation was not requested at context "
129                      "creation.\n");
130 
131       return GL_NO_ERROR;
132    }
133 
134    if (ctx->Driver.GetGraphicsResetStatus) {
135       /* Query the reset status of this context from the driver core.
136        */
137       status = ctx->Driver.GetGraphicsResetStatus(ctx);
138 
139       simple_mtx_lock(&ctx->Shared->Mutex);
140 
141       /* If this context has not been affected by a GPU reset, check to see if
142        * some other context in the share group has been affected by a reset.
143        * If another context saw a reset but this context did not, assume that
144        * this context was not guilty.
145        */
146       if (status != GL_NO_ERROR) {
147          ctx->Shared->ShareGroupReset = true;
148          ctx->Shared->DisjointOperation = true;
149       } else if (ctx->Shared->ShareGroupReset && !ctx->ShareGroupReset) {
150          status = GL_INNOCENT_CONTEXT_RESET_ARB;
151       }
152 
153       ctx->ShareGroupReset = ctx->Shared->ShareGroupReset;
154       simple_mtx_unlock(&ctx->Shared->Mutex);
155    }
156 
157    if (status != GL_NO_ERROR)
158       _mesa_set_context_lost_dispatch(ctx);
159 
160    if (!ctx->Driver.GetGraphicsResetStatus && (MESA_VERBOSE & VERBOSE_API))
161       _mesa_debug(ctx,
162                   "glGetGraphicsResetStatusARB always returns GL_NO_ERROR "
163                   "because the driver doesn't track reset status.\n");
164 
165    return status;
166 }
167