src/egl/main/eglcontext.h

   1 #ifndef EGLCONTEXT_INCLUDED
   2 #define EGLCONTEXT_INCLUDED
   3
   4
   5 #include "egltypedefs.h"
   6 #include "egldisplay.h"
   7
   8
   9 /**
  10  * "Base" class for device driver contexts.
  11  */
  12 struct _egl_context
  13 {
  14    /* A context is a display resource */
  15    _EGLResource Resource;
  16
  17    /* The bound status of the context */
  18    _EGLThreadInfo *Binding;
  19    _EGLSurface *DrawSurface;
  20    _EGLSurface *ReadSurface;
  21
  22    _EGLConfig *Config;
  23
  24    EGLint ClientAPI; /**< EGL_OPENGL_ES_API, EGL_OPENGL_API, EGL_OPENVG_API */
  25    EGLint ClientVersion; /**< 1 = OpenGLES 1.x, 2 = OpenGLES 2.x */
  26
  27    /* The real render buffer when a window surface is bound */
  28    EGLint WindowRenderBuffer;
  29 };
  30
  31
  32 PUBLIC EGLBoolean
  33 _eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
  34                 _EGLConfig *config, const EGLint *attrib_list);
  35
  36
  37 extern EGLBoolean
  38 _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
  39
  40
  41 PUBLIC EGLBoolean
  42 _eglBindContext(_EGLContext *ctx, _EGLSurface *draw, _EGLSurface *read,
  43                 _EGLContext **old_ctx,
  44                 _EGLSurface **old_draw, _EGLSurface **old_read);
  45
  46
  47 /**
  48  * Increment reference count for the context.
  49  */
  50 static INLINE _EGLContext *
  51 _eglGetContext(_EGLContext *ctx)
  52 {
  53    if (ctx)
  54       _eglGetResource(&ctx->Resource);
  55    return ctx;
  56 }
  57
  58
  59 /**
  60  * Decrement reference count for the context.
  61  */
  62 static INLINE EGLBoolean
  63 _eglPutContext(_EGLContext *ctx)
  64 {
  65    return (ctx) ? _eglPutResource(&ctx->Resource) : EGL_FALSE;
  66 }
  67
  68
  69 /**
  70  * Link a context to its display and return the handle of the link.
  71  * The handle can be passed to client directly.
  72  */
  73 static INLINE EGLContext
  74 _eglLinkContext(_EGLContext *ctx)
  75 {
  76    _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
  77    return (EGLContext) ctx;
  78 }
  79
  80
  81 /**
  82  * Unlink a linked context from its display.
  83  * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
  84  */
  85 static INLINE void
  86 _eglUnlinkContext(_EGLContext *ctx)
  87 {
  88    _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
  89 }
  90
  91
  92 /**
  93  * Lookup a handle to find the linked context.
  94  * Return NULL if the handle has no corresponding linked context.
  95  */
  96 static INLINE _EGLContext *
  97 _eglLookupContext(EGLContext context, _EGLDisplay *dpy)
  98 {
  99    _EGLContext *ctx = (_EGLContext *) context;
 100    if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
 101       ctx = NULL;
 102    return ctx;
 103 }
 104
 105
 106 /**
 107  * Return the handle of a linked context, or EGL_NO_CONTEXT.
 108  */
 109 static INLINE EGLContext
 110 _eglGetContextHandle(_EGLContext *ctx)
 111 {
 112    _EGLResource *res = (_EGLResource *) ctx;
 113    return (res && _eglIsResourceLinked(res)) ?
 114       (EGLContext) ctx : EGL_NO_CONTEXT;
 115 }
 116
 117
 118 #endif /* EGLCONTEXT_INCLUDED */