hooks.h revision 923c661a86c9e0737b3f16ceffd77e71e023ca54 
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 <pthread.h>
25
26#include <EGL/egl.h>
27#include <EGL/eglext.h>
28#include <GLES/gl.h>
29#include <GLES/glext.h>
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    IMPL_NUM_DRIVERS_IMPLEMENTATIONS,
64    IMPL_NO_CONTEXT = IMPL_NUM_DRIVERS_IMPLEMENTATIONS,
65    IMPL_NUM_IMPLEMENTATIONS
66};
67
68// ----------------------------------------------------------------------------
69
70// GL / EGL hooks
71
72#undef GL_ENTRY
73#undef EGL_ENTRY
74#define GL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
75#define EGL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
76
77struct gl_hooks_t {
78    struct gl_t {
79        #include "GLES_CM/gl_entries.in"
80        #include "GLES_CM/glext_entries.in"
81    } gl;
82    struct gl2_t {
83        #include "GLES2/gl2_entries.in"
84        #include "GLES2/gl2ext_entries.in"
85    } gl2;
86    struct egl_t {
87        #include "EGL/egl_entries.in"
88    } egl;
89    struct gl_ext_t {
90        void (*extensions[MAX_NUMBER_OF_GL_EXTENSIONS])(void);
91    } ext;
92};
93#undef GL_ENTRY
94#undef EGL_ENTRY
95
96
97// ----------------------------------------------------------------------------
98
99extern gl_hooks_t gHooks[IMPL_NUM_IMPLEMENTATIONS];
100extern pthread_key_t gGLWrapperKey;
101extern "C" void gl_unimplemented();
102
103extern char const * const gl_names[];
104extern char const * const gl2_names[];
105extern char const * const egl_names[];
106
107// ----------------------------------------------------------------------------
108
109#if USE_FAST_TLS_KEY
110
111// We have a dedicated TLS slot in bionic
112static inline gl_hooks_t const * volatile * get_tls_hooks() {
113    volatile void *tls_base = __get_tls();
114    gl_hooks_t const * volatile * tls_hooks =
115            reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
116    return tls_hooks;
117}
118
119static inline void setGlThreadSpecific(gl_hooks_t const *value) {
120    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
121    tls_hooks[TLS_SLOT_OPENGL_API] = value;
122}
123
124static gl_hooks_t const* getGlThreadSpecific() {
125    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
126    gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
127    if (hooks) return hooks;
128    return &gHooks[IMPL_NO_CONTEXT];
129}
130
131#else
132
133static inline void setGlThreadSpecific(gl_hooks_t const *value) {
134    pthread_setspecific(gGLWrapperKey, value);
135}
136
137static gl_hooks_t const* getGlThreadSpecific() {
138    gl_hooks_t const* hooks =  static_cast<gl_hooks_t*>(pthread_getspecific(gGLWrapperKey));
139    if (hooks) return hooks;
140    return &gHooks[IMPL_NO_CONTEXT];
141}
142
143#endif
144
145
146// ----------------------------------------------------------------------------
147}; // namespace android
148// ----------------------------------------------------------------------------
149
150#endif /* ANDROID_GLES_CM_HOOKS_H */
151