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 ClientVersion; /**< 1 = OpenGLES 1.x, 2 = OpenGLES 2.x */
  56
  57    /* The real render buffer when a window surface is bound */
  58    EGLint WindowRenderBuffer;
  59 };
  60
  61
  62 PUBLIC EGLBoolean
  63 _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
  64                 _EGLConfig *config, const EGLint *attrib_list);
  65
  66
  67 extern EGLBoolean
  68 _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
  69
  70
  71 PUBLIC EGLBoolean
  72 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
  73                 _EGLContext **old_ctx,
  74                 _EGLSurface **old_draw, _EGLSurface **old_read);
  75
  76
  77 /**
  78  * Increment reference count for the context.
  79  */
  80 static INLINE _EGLContext *
  81 _eglGetContext(_EGLContext *ctx)
  82 {
  83    if (ctx)
  84       _eglGetResource(&ctx->Resource);
  85    return ctx;
  86 }
  87
  88
  89 /**
  90  * Decrement reference count for the context.
  91  */
  92 static INLINE EGLBoolean
  93 _eglPutContext(_EGLContext *ctx)
  94 {
  95    return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
  96 }
  97
  98
  99 /**
 100  * Link a context to its display and return the handle of the link.
 101  * The handle can be passed to client directly.
 102  */
 103 static INLINE EGLContext
 104 _eglLinkContext(_EGLContext *ctx)
 105 {
 106    _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
 107    return (EGLContext) ctx;
 108 }
 109
 110
 111 /**
 112  * Unlink a linked context from its display.
 113  * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
 114  */
 115 static INLINE void
 116 _eglUnlinkContext(_EGLContext *ctx)
 117 {
 118    _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
 119 }
 120
 121
 122 /**
 123  * Lookup a handle to find the linked context.
 124  * Return NULL if the handle has no corresponding linked context.
 125  */
 126 static INLINE _EGLContext *
 127 _eglLookupContext(EGLContext context, _EGLDisplay *dpy)
 128 {
 129    _EGLContext *ctx = (_EGLContext *) context;
 130    if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
 131       ctx = NULL;
 132    return ctx;
 133 }
 134
 135
 136 /**
 137  * Return the handle of a linked context, or EGL_NO_CONTEXT.
 138  */
 139 static INLINE EGLContext
 140 _eglGetContextHandle(_EGLContext *ctx)
 141 {
 142    _EGLResource *res = (_EGLResource *) ctx;
 143    return (res && _eglIsResourceLinked(res)) ?
 144       (EGLContext) ctx : EGL_NO_CONTEXT;
 145 }
 146
 147
 148 #endif /* EGLCONTEXT_INCLUDED */