hooks.h revision a2dd6cf59962e3a21a47df29b2f243e904839ba7 
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 64
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_IMPLEMENTATIONS
64};
65
66enum {
67    GLESv1_INDEX = 0,
68    GLESv2_INDEX = 1,
69};
70
71// ----------------------------------------------------------------------------
72
73// GL / EGL hooks
74
75#undef GL_ENTRY
76#undef EGL_ENTRY
77#define GL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
78#define EGL_ENTRY(_r, _api, ...) _r (*_api)(__VA_ARGS__);
79
80struct egl_t {
81    #include "EGL/egl_entries.in"
82};
83
84struct gl_hooks_t {
85    struct gl_t {
86        #include "entries.in"
87    } gl;
88    struct gl_ext_t {
89        __eglMustCastToProperFunctionPointerType extensions[MAX_NUMBER_OF_GL_EXTENSIONS];
90    } ext;
91};
92#undef GL_ENTRY
93#undef EGL_ENTRY
94
95
96// ----------------------------------------------------------------------------
97
98extern gl_hooks_t gHooks[2][IMPL_NUM_IMPLEMENTATIONS];
99extern gl_hooks_t gHooksNoContext;
100extern pthread_key_t gGLWrapperKey;
101extern "C" void gl_unimplemented();
102
103extern char const * const gl_names[];
104extern char const * const egl_names[];
105
106// ----------------------------------------------------------------------------
107
108#if USE_FAST_TLS_KEY
109
110// We have a dedicated TLS slot in bionic
111static inline gl_hooks_t const * volatile * get_tls_hooks() {
112    volatile void *tls_base = __get_tls();
113    gl_hooks_t const * volatile * tls_hooks =
114            reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
115    return tls_hooks;
116}
117
118static inline void setGlThreadSpecific(gl_hooks_t const *value) {
119    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
120    tls_hooks[TLS_SLOT_OPENGL_API] = value;
121}
122
123static gl_hooks_t const* getGlThreadSpecific() {
124    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
125    gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
126    if (hooks) return hooks;
127    return &gHooksNoContext;
128}
129
130#else
131
132static inline void setGlThreadSpecific(gl_hooks_t const *value) {
133    pthread_setspecific(gGLWrapperKey, value);
134}
135
136static gl_hooks_t const* getGlThreadSpecific() {
137    gl_hooks_t const* hooks =  static_cast<gl_hooks_t*>(pthread_getspecific(gGLWrapperKey));
138    if (hooks) return hooks;
139    return &gHooksNoContext;
140}
141
142#endif
143
144#if EGL_TRACE
145
146extern gl_hooks_t const* getGLTraceThreadSpecific();
147
148#endif
149
150// ----------------------------------------------------------------------------
151}; // namespace android
152// ----------------------------------------------------------------------------
153
154#endif /* ANDROID_GLES_CM_HOOKS_H */
155