1/**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 *
28 **************************************************************************/
29
30
31#ifndef EGLCONTEXT_INCLUDED
32#define EGLCONTEXT_INCLUDED
33
34#include "c99_compat.h"
35
36#include "egltypedefs.h"
37#include "egldisplay.h"
38
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/**
45 * "Base" class for device driver contexts.
46 */
47struct _egl_context
48{
49   /* A context is a display resource */
50   _EGLResource Resource;
51
52   /* The bound status of the context */
53   _EGLThreadInfo *Binding;
54   _EGLSurface *DrawSurface;
55   _EGLSurface *ReadSurface;
56
57   _EGLConfig *Config;
58
59   EGLint ClientAPI; /**< EGL_OPENGL_ES_API, EGL_OPENGL_API, EGL_OPENVG_API */
60   EGLint ClientMajorVersion;
61   EGLint ClientMinorVersion;
62   EGLint Flags;
63   EGLint Profile;
64   EGLint ResetNotificationStrategy;
65   EGLint ContextPriority;
66   EGLBoolean NoError;
67   EGLint ReleaseBehavior;
68};
69
70
71extern EGLBoolean
72_eglInitContext(_EGLContext *ctx, _EGLDisplay *disp,
73                _EGLConfig *config, const EGLint *attrib_list);
74
75
76extern EGLBoolean
77_eglQueryContext(_EGLDriver *drv, _EGLDisplay *disp, _EGLContext *ctx, EGLint attribute, EGLint *value);
78
79
80extern EGLBoolean
81_eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
82                _EGLContext **old_ctx,
83                _EGLSurface **old_draw, _EGLSurface **old_read);
84
85extern _EGLContext *
86_eglBindContextToThread(_EGLContext *ctx, _EGLThreadInfo *t);
87
88
89/**
90 * Increment reference count for the context.
91 */
92static inline _EGLContext *
93_eglGetContext(_EGLContext *ctx)
94{
95   if (ctx)
96      _eglGetResource(&ctx->Resource);
97   return ctx;
98}
99
100
101/**
102 * Decrement reference count for the context.
103 */
104static inline EGLBoolean
105_eglPutContext(_EGLContext *ctx)
106{
107   return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
108}
109
110
111/**
112 * Link a context to its display and return the handle of the link.
113 * The handle can be passed to client directly.
114 */
115static inline EGLContext
116_eglLinkContext(_EGLContext *ctx)
117{
118   _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
119   return (EGLContext) ctx;
120}
121
122
123/**
124 * Unlink a linked context from its display.
125 * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
126 */
127static inline void
128_eglUnlinkContext(_EGLContext *ctx)
129{
130   _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
131}
132
133
134/**
135 * Lookup a handle to find the linked context.
136 * Return NULL if the handle has no corresponding linked context.
137 */
138static inline _EGLContext *
139_eglLookupContext(EGLContext context, _EGLDisplay *disp)
140{
141   _EGLContext *ctx = (_EGLContext *) context;
142   if (!disp || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, disp))
143      ctx = NULL;
144   return ctx;
145}
146
147
148/**
149 * Return the handle of a linked context, or EGL_NO_CONTEXT.
150 */
151static inline EGLContext
152_eglGetContextHandle(_EGLContext *ctx)
153{
154   _EGLResource *res = (_EGLResource *) ctx;
155   return (res && _eglIsResourceLinked(res)) ?
156      (EGLContext) ctx : EGL_NO_CONTEXT;
157}
158
159
160#ifdef __cplusplus
161}
162#endif
163
164#endif /* EGLCONTEXT_INCLUDED */
165