hooks.h revision b1a39d67be99fe6c4545b25e10ac82a5dd1df634 
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 <EGL/eglext.h>
26
27#include <GLES/gl.h>
28#include <GLES/glext.h>
29
30#include <GLES2/gl2.h>
31#include <GLES2/gl2ext.h>
32
33#if !defined(__arm__)
34#define USE_SLOW_BINDING            1
35#else
36#define USE_SLOW_BINDING            0
37#endif
38#undef NELEM
39#define NELEM(x)                    (sizeof(x)/sizeof(*(x)))
40#define MAX_NUMBER_OF_GL_EXTENSIONS 32
41
42
43#if defined(HAVE_ANDROID_OS) && !USE_SLOW_BINDING && __OPTIMIZE__
44#define USE_FAST_TLS_KEY            1
45#else
46#define USE_FAST_TLS_KEY            0
47#endif
48
49#if USE_FAST_TLS_KEY
50#   include <bionic_tls.h>  /* special private C library header */
51#endif
52
53// ----------------------------------------------------------------------------
54namespace android {
55// ----------------------------------------------------------------------------
56
57//  EGLDisplay are global, not attached to a given thread
58const unsigned int NUM_DISPLAYS = 1;
59
60enum {
61    IMPL_HARDWARE = 0,
62    IMPL_SOFTWARE,
63
64    IMPL_NUM_DRIVERS_IMPLEMENTATIONS,
65
66    IMPL_CONTEXT_LOST = IMPL_NUM_DRIVERS_IMPLEMENTATIONS,
67    IMPL_NO_CONTEXT,
68
69    IMPL_NUM_IMPLEMENTATIONS
70};
71
72// ----------------------------------------------------------------------------
73
74// GL / EGL hooks
75
76#undef GL_ENTRY
77#undef EGL_ENTRY
78#define GL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
79#define EGL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
80
81struct gl_hooks_t {
82    struct gl_t {
83        #include "GLES_CM/gl_entries.in"
84        #include "GLES_CM/glext_entries.in"
85    } gl;
86    struct gl2_t {
87        #include "GLES2/gl2_entries.in"
88        #include "GLES2/gl2ext_entries.in"
89    } gl2;
90    struct egl_t {
91        #include "EGL/egl_entries.in"
92    } egl;
93    struct gl_ext_t {
94        void (*extensions[MAX_NUMBER_OF_GL_EXTENSIONS])(void);
95    } ext;
96};
97#undef GL_ENTRY
98#undef EGL_ENTRY
99
100
101// ----------------------------------------------------------------------------
102
103extern gl_hooks_t gHooks[IMPL_NUM_IMPLEMENTATIONS];
104extern pthread_key_t gGLWrapperKey;
105
106#if USE_FAST_TLS_KEY
107
108// We have a dedicated TLS slot in bionic
109static inline gl_hooks_t const * volatile * get_tls_hooks() {
110    volatile void *tls_base = __get_tls();
111    gl_hooks_t const * volatile * tls_hooks =
112            reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
113    return tls_hooks;
114}
115
116static inline void setGlThreadSpecific(gl_hooks_t const *value) {
117    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
118    tls_hooks[TLS_SLOT_OPENGL_API] = value;
119}
120
121static gl_hooks_t const* getGlThreadSpecific() {
122    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
123    gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
124    if (hooks) return hooks;
125    return &gHooks[IMPL_NO_CONTEXT];
126}
127
128#else
129
130static inline void setGlThreadSpecific(gl_hooks_t const *value) {
131    pthread_setspecific(gGLWrapperKey, value);
132}
133
134static gl_hooks_t const* getGlThreadSpecific() {
135    gl_hooks_t const* hooks =  static_cast<gl_hooks_t*>(pthread_getspecific(gGLWrapperKey));
136    if (hooks) return hooks;
137    return &gHooks[IMPL_NO_CONTEXT];
138}
139
140#endif
141
142
143// ----------------------------------------------------------------------------
144}; // namespace android
145// ----------------------------------------------------------------------------
146
147#endif /* ANDROID_GLES_CM_HOOKS_H */
148