hooks.h revision edbf3b6af777b721cd2a1ef461947e51e88241e1 
1/*
2 ** Copyright 2007, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 **     http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17#ifndef ANDROID_GLES_CM_HOOKS_H
18#define ANDROID_GLES_CM_HOOKS_H
19
20#include <ctype.h>
21#include <string.h>
22#include <errno.h>
23
24#include <EGL/egl.h>
25#include <GLES/gl.h>
26
27#define GL_LOGGER                   0
28#if !defined(__arm__)
29#define USE_SLOW_BINDING            1
30#else
31#define USE_SLOW_BINDING            0
32#endif
33#undef NELEM
34#define NELEM(x)                    (sizeof(x)/sizeof(*(x)))
35#define MAX_NUMBER_OF_GL_EXTENSIONS 32
36
37
38#if defined(HAVE_ANDROID_OS) && !USE_SLOW_BINDING && !GL_LOGGER && __OPTIMIZE__
39#define USE_FAST_TLS_KEY            1
40#else
41#define USE_FAST_TLS_KEY            0
42#endif
43
44#if USE_FAST_TLS_KEY
45#   include <bionic_tls.h>  /* special private C library header */
46#endif
47
48// ----------------------------------------------------------------------------
49namespace android {
50// ----------------------------------------------------------------------------
51
52//  EGLDisplay are global, not attached to a given thread
53const unsigned int NUM_DISPLAYS = 1;
54
55enum {
56    IMPL_HARDWARE = 0,
57    IMPL_SOFTWARE,
58    IMPL_CONTEXT_LOST,
59    IMPL_NO_CONTEXT,
60
61    IMPL_NUM_IMPLEMENTATIONS
62};
63
64// ----------------------------------------------------------------------------
65
66// GL / EGL hooks
67
68#undef GL_ENTRY
69#undef EGL_ENTRY
70#define GL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
71#define EGL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
72
73struct gl_hooks_t {
74    struct gl_t {
75        #include "gl_entries.in"
76    } gl;
77    struct egl_t {
78        #include "egl_entries.in"
79    } egl;
80    struct gl_ext_t {
81        void (*extensions[MAX_NUMBER_OF_GL_EXTENSIONS])(void);
82    } ext;
83};
84#undef GL_ENTRY
85#undef EGL_ENTRY
86
87
88// ----------------------------------------------------------------------------
89
90extern gl_hooks_t gHooks[IMPL_NUM_IMPLEMENTATIONS];
91extern pthread_key_t gGLWrapperKey;
92
93#if USE_FAST_TLS_KEY
94
95// We have a dedicated TLS slot in bionic
96static inline gl_hooks_t const * volatile * get_tls_hooks() {
97    volatile void *tls_base = __get_tls();
98    gl_hooks_t const * volatile * tls_hooks =
99            reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
100    return tls_hooks;
101}
102
103static inline void setGlThreadSpecific(gl_hooks_t const *value) {
104    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
105    tls_hooks[TLS_SLOT_OPENGL_API] = value;
106}
107
108static gl_hooks_t const* getGlThreadSpecific() {
109    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
110    gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
111    if (hooks) return hooks;
112    return &gHooks[IMPL_NO_CONTEXT];
113}
114
115#else
116
117static inline void setGlThreadSpecific(gl_hooks_t const *value) {
118    pthread_setspecific(gGLWrapperKey, value);
119}
120
121static gl_hooks_t const* getGlThreadSpecific() {
122    gl_hooks_t const* hooks =  static_cast<gl_hooks_t*>(pthread_getspecific(gGLWrapperKey));
123    if (hooks) return hooks;
124    return &gHooks[IMPL_NO_CONTEXT];
125}
126
127#endif
128
129
130// ----------------------------------------------------------------------------
131}; // namespace android
132// ----------------------------------------------------------------------------
133
134#endif /* ANDROID_GLES_CM_HOOKS_H */
135