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  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 */
  162.