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#include <GLES3/gl3.h>
33#include <GLES3/gl31.h>
34#include <GLES3/gl32.h>
35
36// set to 1 for debugging
37#define USE_SLOW_BINDING    0
38
39#undef NELEM
40#define NELEM(x)            (sizeof(x)/sizeof(*(x)))
41
42// maximum number of GL extensions that can be used simultaneously in
43// a given process. this limitation exists because we need to have
44// a static function for each extension and currently these static functions
45// are generated at compile time.
46#define MAX_NUMBER_OF_GL_EXTENSIONS 256
47
48
49#include <bionic_tls.h>  /* special private C library header */
50
51// ----------------------------------------------------------------------------
52namespace android {
53// ----------------------------------------------------------------------------
54
55// GL / EGL hooks
56
57#undef GL_ENTRY
58#undef EGL_ENTRY
59#define GL_ENTRY(_r, _api, ...) _r (*(_api))(__VA_ARGS__);
60#define EGL_ENTRY(_r, _api, ...) _r (*(_api))(__VA_ARGS__);
61
62struct egl_t {
63    #include "EGL/egl_entries.in"
64};
65
66struct gl_hooks_t {
67    struct gl_t {
68        #include "entries.in"
69    } gl;
70    struct gl_ext_t {
71        __eglMustCastToProperFunctionPointerType extensions[MAX_NUMBER_OF_GL_EXTENSIONS];
72    } ext;
73};
74#undef GL_ENTRY
75#undef EGL_ENTRY
76
77EGLAPI void setGlThreadSpecific(gl_hooks_t const *value);
78
79// We have a dedicated TLS slot in bionic
80inline gl_hooks_t const * volatile * get_tls_hooks() {
81    volatile void *tls_base = __get_tls();
82    gl_hooks_t const * volatile * tls_hooks =
83            reinterpret_cast<gl_hooks_t const * volatile *>(tls_base);
84    return tls_hooks;
85}
86
87inline EGLAPI gl_hooks_t const* getGlThreadSpecific() {
88    gl_hooks_t const * volatile * tls_hooks = get_tls_hooks();
89    gl_hooks_t const* hooks = tls_hooks[TLS_SLOT_OPENGL_API];
90    return hooks;
91}
92
93// ----------------------------------------------------------------------------
94}; // namespace android
95// ----------------------------------------------------------------------------
96
97#endif /* ANDROID_GLES_CM_HOOKS_H */
98