eglcontext.h revision d69242be55091e53b0ae2cfa6282790ce1862f29 
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 */
12struct _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
32PUBLIC EGLBoolean
33_eglInitContext(_EGLContext *ctx, _EGLDisplay *dpy,
34                _EGLConfig *config, const EGLint *attrib_list);
35
36
37extern _EGLContext *
38_eglCreateContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLConfig *conf, _EGLContext *share_list, const EGLint *attrib_list);
39
40
41extern EGLBoolean
42_eglDestroyContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx);
43
44
45extern EGLBoolean
46_eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy, _EGLContext *ctx, EGLint attribute, EGLint *value);
47
48
49PUBLIC EGLBoolean
50_eglBindContext(_EGLContext **ctx, _EGLSurface **draw, _EGLSurface **read);
51
52
53extern EGLBoolean
54_eglMakeCurrent(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *draw, _EGLSurface *read, _EGLContext *ctx);
55
56
57extern EGLBoolean
58_eglCopyContextMESA(_EGLDriver *drv, EGLDisplay dpy, EGLContext source, EGLContext dest, EGLint mask);
59
60
61/**
62 * Return true if the context is bound to a thread.
63 */
64static INLINE EGLBoolean
65_eglIsContextBound(_EGLContext *ctx)
66{
67   return (ctx->Binding != NULL);
68}
69
70
71/**
72 * Link a context to a display and return the handle of the link.
73 * The handle can be passed to client directly.
74 */
75static INLINE EGLContext
76_eglLinkContext(_EGLContext *ctx, _EGLDisplay *dpy)
77{
78   _eglLinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT, dpy);
79   return (EGLContext) ctx;
80}
81
82
83/**
84 * Unlink a linked context from its display.
85 * Accessing an unlinked context should generate EGL_BAD_CONTEXT error.
86 */
87static INLINE void
88_eglUnlinkContext(_EGLContext *ctx)
89{
90   _eglUnlinkResource(&ctx->Resource, _EGL_RESOURCE_CONTEXT);
91}
92
93
94/**
95 * Lookup a handle to find the linked context.
96 * Return NULL if the handle has no corresponding linked context.
97 */
98static INLINE _EGLContext *
99_eglLookupContext(EGLContext context, _EGLDisplay *dpy)
100{
101   _EGLContext *ctx = (_EGLContext *) context;
102   if (!dpy || !_eglCheckResource((void *) ctx, _EGL_RESOURCE_CONTEXT, dpy))
103      ctx = NULL;
104   return ctx;
105}
106
107
108/**
109 * Return the handle of a linked context, or EGL_NO_CONTEXT.
110 */
111static INLINE EGLContext
112_eglGetContextHandle(_EGLContext *ctx)
113{
114   _EGLResource *res = (_EGLResource *) ctx;
115   return (res && _eglIsResourceLinked(res)) ?
116      (EGLContext) ctx : EGL_NO_CONTEXT;
117}
118
119
120/**
121 * Return true if the context is linked to a display.
122 */
123static INLINE EGLBoolean
124_eglIsContextLinked(_EGLContext *ctx)
125{
126   _EGLResource *res = (_EGLResource *) ctx;
127   return (res && _eglIsResourceLinked(res));
128}
129
130
131#endif /* EGLCONTEXT_INCLUDED */
132