src/egl/main/eglcontext.h

   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
  41 extern "C" {
  42 #endif
  43
  44 /**
  45  * "Base" class for device driver contexts.
  46  */
  47 struct _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
  66    /* The real render buffer when a window surface is bound */
  67    EGLint WindowRenderBuffer;
  68 };
  69
  70
  71 extern EGLBoolean
  72 _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
  73                 _EGLConfig *config, const EGLint *attrib_list);
  74
  75
  76 extern EGLBoolean
  77 _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
  78
  79
  80 extern EGLBoolean
  81 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
  82                 _EGLContext **old_ctx,
  83                 _EGLSurface **old_draw, _EGLSurface **old_read);
  84
  85
  86 /**
  87  * Increment reference count for the context.
  88  */
  89 static inline _EGLContext *
  90 _eglGetContext(_EGLContext *ctx)
  91 {
  92    if (ctx)
  93       _eglGetResource(&ctx->Resource);
  94    return ctx;
  95 }
  96
  97
  98 /**
  99  * Decrement reference count for the context.
 100  */
 101 static inline EGLBoolean
 102 _eglPutContext(_EGLContext *ctx)
 103 {
 104    return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
 105 }
 106
 107
 108 /**
 109  * Link a context to its display and return the handle of the link.
 110  * The handle can be passed to client directly.
 111  */
 112 static inline EGLContext
 113 _eglLinkContext(_EGLContext *ctx)
 114 {
 115    _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
 116    return (EGLContext) ctx;
 117 }
 118
 119
 120 /**
 121  * Unlink a linked context from its display.
 122  * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
 123  */
 124 static inline void
 125 _eglUnlinkContext(_EGLContext *ctx)
 126 {
 127    _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
 128 }
 129
 130
 131 /**
 132  * Lookup a handle to find the linked context.
 133  * Return NULL if the handle has no corresponding linked context.
 134  */
 135 static inline _EGLContext *
 136 _eglLookupContext(EGLContext context, _EGLDisplay *dpy)
 137 {
 138    _EGLContext *ctx = (_EGLContext *) context;
 139    if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
 140       ctx = NULL;
 141    return ctx;
 142 }
 143
 144
 145 /**
 146  * Return the handle of a linked context, or EGL_NO_CONTEXT.
 147  */
 148 static inline EGLContext
 149 _eglGetContextHandle(_EGLContext *ctx)
 150 {
 151    _EGLResource *res = (_EGLResource *) ctx;
 152    return (res && _eglIsResourceLinked(res)) ?
 153       (EGLContext) ctx : EGL_NO_CONTEXT;
 154 }
 155
 156
 157 #ifdef __cplusplus
 158 }
 159 #endif
 160
 161 #endif /* EGLCONTEXT_INCLUDED */