src/egl/main/eglcontext.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   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
  35 #include "egltypedefs.h"
  36 #include "egldisplay.h"
  37
  38
  39 /**
  40  * "Base" class for device driver contexts.
  41  */
  42 struct _egl_context
  43 {
  44    /* A context is a display resource */
  45    _EGLResource Resource;
  46
  47    /* The bound status of the context */
  48    _EGLThreadInfo *Binding;
  49    _EGLSurface *DrawSurface;
  50    _EGLSurface *ReadSurface;
  51
  52    _EGLConfig *Config;
  53
  54    EGLint ClientAPI; /**< EGL_OPENGL_ES_API, EGL_OPENGL_API, EGL_OPENVG_API */
  55    EGLint ClientMajorVersion;
  56    EGLint ClientMinorVersion;
  57    EGLint Flags;
  58    EGLint Profile;
  59    EGLint ResetNotificationStrategy;
  60
  61    /* The real render buffer when a window surface is bound */
  62    EGLint WindowRenderBuffer;
  63 };
  64
  65
  66 PUBLIC EGLBoolean
  67 _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
  68                 _EGLConfig *config, const EGLint *attrib_list);
  69
  70
  71 extern EGLBoolean
  72 _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
  73
  74
  75 PUBLIC EGLBoolean
  76 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
  77                 _EGLContext **old_ctx,
  78                 _EGLSurface **old_draw, _EGLSurface **old_read);
  79
  80
  81 /**
  82  * Increment reference count for the context.
  83  */
  84 static INLINE _EGLContext *
  85 _eglGetContext(_EGLContext *ctx)
  86 {
  87    if (ctx)
  88       _eglGetResource(&ctx->Resource);
  89    return ctx;
  90 }
  91
  92
  93 /**
  94  * Decrement reference count for the context.
  95  */
  96 static INLINE EGLBoolean
  97 _eglPutContext(_EGLContext *ctx)
  98 {
  99    return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
 100 }
 101
 102
 103 /**
 104  * Link a context to its display and return the handle of the link.
 105  * The handle can be passed to client directly.
 106  */
 107 static INLINE EGLContext
 108 _eglLinkContext(_EGLContext *ctx)
 109 {
 110    _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
 111    return (EGLContext) ctx;
 112 }
 113
 114
 115 /**
 116  * Unlink a linked context from its display.
 117  * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
 118  */
 119 static INLINE void
 120 _eglUnlinkContext(_EGLContext *ctx)
 121 {
 122    _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
 123 }
 124
 125
 126 /**
 127  * Lookup a handle to find the linked context.
 128  * Return NULL if the handle has no corresponding linked context.
 129  */
 130 static INLINE _EGLContext *
 131 _eglLookupContext(EGLContext context, _EGLDisplay *dpy)
 132 {
 133    _EGLContext *ctx = (_EGLContext *) context;
 134    if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
 135       ctx = NULL;
 136    return ctx;
 137 }
 138
 139
 140 /**
 141  * Return the handle of a linked context, or EGL_NO_CONTEXT.
 142  */
 143 static INLINE EGLContext
 144 _eglGetContextHandle(_EGLContext *ctx)
 145 {
 146    _EGLResource *res = (_EGLResource *) ctx;
 147    return (res && _eglIsResourceLinked(res)) ?
 148       (EGLContext) ctx : EGL_NO_CONTEXT;
 149 }
 150
 151
 152 #endif /* EGLCONTEXT_INCLUDED */